From nobody Mon Nov 2 09:57:07 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8153E3A0ED5 for ; Mon, 2 Nov 2020 09:57:05 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.087 X-Spam-Level: X-Spam-Status: No, score=-2.087 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_KAM_HTML_FONT_INVALID=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id b0DWPmNNR3V4 for ; Mon, 2 Nov 2020 09:57:04 -0800 (PST) Received: from mail-lj1-x22d.google.com (mail-lj1-x22d.google.com [IPv6:2a00:1450:4864:20::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA70A3A0C41 for ; Mon, 2 Nov 2020 09:57:03 -0800 (PST) Received: by mail-lj1-x22d.google.com with SMTP id m16so16013064ljo.6 for ; Mon, 02 Nov 2020 09:57:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=5OerUktPK+odCek5DnFakc9ZJ93vHD+XwobmKFB03Jg=; b=AOs7ZMJ176RXNT12C5l+ra84btl+YQzentddVLUxUBajYMTgw4v0XYQTDzBSn36XHL JyHTsQ/6KlcfAtPa49A2TU6Cf6bA1Wphdq4SDRM+nus79Aw+COXYAj9YW60+uRh5XbZd utV5OZNGVKIb0w1r7O5aCUI9HmX5+FXoOsPs+yMld8UvVQpBqW+bt0wPZnRplg3qvysU OtXgaEBXFlFFA3s1MoFnMqrtuvZy6JEpottsFDDFBTSD6UHSk7gp2Ao8wUNXoMJMNCmf ZjyoY00pDPz1R69VpFmkcKmMRLeIgXkgwEj8o6ga5m0lPEQNvvvj3DGAFBvSt/ZmkqRn 7Zig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=5OerUktPK+odCek5DnFakc9ZJ93vHD+XwobmKFB03Jg=; b=mzkGlaDsqY19HOej7MW3oituCtcTE1JRS2cFx6LHzRn2PGk1sMS6ieqhQJDSg/NlqO ElJ3KDX+kt5t/75gDBQklPEr5RxqdlZu6ptufLhP7eBEGdc0CT/RouWQRXJWhNX+teRW Wz6NScj735xlC3erQ8dprCzNC9fm5u2CU+yRjwmghFsdbg5OlK557bkSbAh8BIHj0JsI wHEX34DwUkvw9NGbvr3FlAuEP6Xg2i6nZJdJSgSnSesCGZYI7DZrmwnlCxHIyfsNxQXO 3dyBxooCO2Lz331F4OmYNX8QjtZ71Tg9nyAXcE+LG7ySJ2nXM6vSSMz7ROctmQE16W6/ UfDQ== X-Gm-Message-State: AOAM530GgIa8fKqTwAf7douUsxyBXA5sdHaCRRwIBO50qzu9rb/4a96D FXFuScQQYw3fExOsGFXUPidrt91Pq70lZauQzTrYOYBC5py4dQ== X-Google-Smtp-Source: ABdhPJwh/Tx0kkOy/6bXcRmPinAVZ6Ab36bWFFXka/tY5w4Nlfner7SeOzEyhF/JmbOxdl95cCOYnefrQPNImJOaji0= X-Received: by 2002:a2e:8798:: with SMTP id n24mr6554773lji.317.1604339821750; Mon, 02 Nov 2020 09:57:01 -0800 (PST) MIME-Version: 1.0 From: Bernard Aboba Date: Mon, 2 Nov 2020 09:56:52 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="0000000000002caccd05b32379e4" Archived-At: Subject: [Webtransport] Reminder: I-D submission deadline today! X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Nov 2020 17:57:06 -0000 --0000000000002caccd05b32379e4 Content-Type: text/plain; charset="UTF-8" Today is the deadline for submission of Internet Drafts for IETF 109 (UTC 23:59). - 2020-11-02 (Monday): Internet Draft submission cut-off (for all drafts, including -00) by UTC 23:59. Upload using the ID Submission Tool . --0000000000002caccd05b32379e4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Today is the deadline for submission of I= nternet Drafts for IETF 109 (UTC 23:59).=C2=A0

  • 2020-11-02 (Monday):=C2=A0Internet Draft submis= sion cut-off (for all drafts, including -00) by UTC 23:59. Upload using the= =C2=A0ID Submission Tool.
    • --0000000000002caccd05b32379e4-- From nobody Tue Nov 3 05:55:17 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id AE1343A00C9 for ; Tue, 3 Nov 2020 05:55:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id iaRlnuyhy-jP for ; Tue, 3 Nov 2020 05:55:14 -0800 (PST) Received: from mail-lj1-x22c.google.com (mail-lj1-x22c.google.com [IPv6:2a00:1450:4864:20::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C57953A0AC6 for ; Tue, 3 Nov 2020 05:55:13 -0800 (PST) Received: by mail-lj1-x22c.google.com with SMTP id v19so14189367lji.5 for ; Tue, 03 Nov 2020 05:55:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=SIGn92AwQRda7HUEsyjVi40lwjmqo2vlO5KdDktJK6M=; b=JQq6IZoh4bCym0WW4tZKpvh/4zQ7DYK2FPOpbuO3UKlDzVysDHBZNk5o2Ry4Mkheoo S2TGCL5uEiXhD9BC1Bh8pONO3LigtdKr/x0E/IN3zOuwabXnll6EELoV7ZA9VO5q1Sd4 gKnj2mdMgdHpD0fA0B/b8lyWmKcT3bHZCKJp4lSE3tmDJujNoj54WholDiQyfZneurHW EzUfxml5y5ffAXUjCeZzlmybsY1e8629N3XubXmFcVwSMLS0Hl+NyjyKLib+QK+PQ/nz 8z3aLcMznEuHrOe6lB949VGmf/H80HKYvQzF3BKBsfbWqDS6HmH/98o2extYFFGP7MFx 691A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=SIGn92AwQRda7HUEsyjVi40lwjmqo2vlO5KdDktJK6M=; b=YBzbdj80cn7qavSbDgWP0TW3ieCI3MCrtVa1cLBDiB/mnqJlW7GYDrvG8cEG/Xk5Q8 ykNKHUeEyanT+9EuwPi9WanwaJMyEJCW90/woxECB+fVFsKSZFsgz0c/9bjHOngjzfcr Ji/sF0hKWucvE5YPrqovaaVCGjybHwIS0wb9LRYsWDRouxmY2Jy6waGWFnztVpfb8H5K HzMnGEEJY/BTK7MAv3Zk+mXb20UAVSPP4YtXj5oDsqMrYf98SFOIEcLmwGlI+VHSsx/Q cOwUtMHKnQkK3p1U6LzVsYK+T+6wQSZM0h7fe/cnGD74edk56nI5bX94uxYgnILablfP MOMA== X-Gm-Message-State: AOAM531zevuy1/se1l9fQnZ7j0im52eY6goA3idfXwhTTZxs/P4vJ2B+ 7P7QSGtJim/RXlbYTWvf2XDaTl8WT/5asEjga6w0ACfP5MRM4A== X-Google-Smtp-Source: ABdhPJxI8nQnYaMBEomHs9vCLr1mAaXzFMTcDpRCYSmyUZ7P1PUj/NtjiVVQqIqe9YfN3KShnibvN+dWAUZ9j3CrRy8= X-Received: by 2002:a2e:7216:: with SMTP id n22mr9294125ljc.187.1604411711629; Tue, 03 Nov 2020 05:55:11 -0800 (PST) MIME-Version: 1.0 From: Bernard Aboba Date: Tue, 3 Nov 2020 05:55:00 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="000000000000252f1005b33436cc" Archived-At: Subject: [Webtransport] Call for Agenda Items: WebTransport WG at IETF 109 X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 03 Nov 2020 13:55:16 -0000 --000000000000252f1005b33436cc Content-Type: text/plain; charset="UTF-8" This is a call for agenda items for the WebTransport WG meeting at IETF 109. The WebTransport WG is scheduled to meet at IETF 109: Monday, November 16, 2020 01:00 - 03:00 Pacific Time Monday, November 16, 2020 09:00 - 11:00 UTC Monday, November 16, 2020 16:00 - 18:00 Banghok A tentative agenda is available here: https://www.ietf.org/proceedings/109/agenda/agenda-109-webtrans-01 --000000000000252f1005b33436cc Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    This is a call for agend= a items for the WebTransport WG meeting at IETF 109.=C2=A0

    The WebTransport WG is scheduled to meet a= t IETF 109:

    Monday, November 16, 2020 01:00 - 03:00= Pacific Time
    Monday, November 16, 2020 09:00 - 11:00 UTC
    Monday, November 16, 2020 16:00 - 18:00 Banghok
    --000000000000252f1005b33436cc-- From nobody Wed Nov 4 15:26:37 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3AAAA3A115C for ; Wed, 4 Nov 2020 15:26:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ji8cOZkbGRfp for ; Wed, 4 Nov 2020 15:26:34 -0800 (PST) Received: from mail-lf1-x132.google.com (mail-lf1-x132.google.com [IPv6:2a00:1450:4864:20::132]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AB62B3A114E for ; Wed, 4 Nov 2020 15:26:34 -0800 (PST) Received: by mail-lf1-x132.google.com with SMTP id e27so111133lfn.7 for ; Wed, 04 Nov 2020 15:26:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=rDivhJR0xq3y7cv9FR8Rq7pScC8iGu4LHdZGrU2QUiQ=; b=FddvfgBdyxLun+sidtcPH/gl5EXkXfepmhAAriTwk8t3yqHWGzzGsd5suUcAEeh8fW 9LYbwuYMnRQ6HrJNVtkjpTKAzOi/PLc2oh2kKRrFTAoqw3l6rXHSicIlch3UZe7mnUzz 4tu96id1tPHDtu/IcHNOWtSSLjqZH/tFWAQDacOTsvNQR+txnPdyDfiIWCerr4rR9Gcg c1b9+VQb94DALSc8qAqK2dT4dS17tPSewK8dL7fbenbU4yq3bUqfIyaIKuaPL6KNq3km bNeAudD0FCxzMCAo3CMVn9eYib6PKqj9o5se66wy2pSWva6cjoXLD9J11XFCct9sAdmK eJNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=rDivhJR0xq3y7cv9FR8Rq7pScC8iGu4LHdZGrU2QUiQ=; b=kQdgLT0J+1WPvObXitrmGg/EeUCXRXzd+JuO6gq0O4MB9gWD1hPRRrW+cL7wxZmW8n km2EVeRb0q6o/pdzidbgZnwYMPk3T5GBwxafqA2Q86XSqT1ZnLIJDzJFPPNAjjBZxs2V Kt231cKs6M4dWJTo6zwsynNN7fd6kpPM5+ekwZKSJfEIowbvCldVEmGkxKdBTqsWoMLd 0TC+cREg25AcFS3P/aWZlsPPyQiVd5kmNGQQ4e5VyGegYupDkyePXCEOjaIYUSv6FEvK Wewz5eYo64JpTxY1+llVwhqk48QL32UnkYP6qTMtzLE08s+iyKB7I/LTAzHE67o8rDo2 8SzA== X-Gm-Message-State: AOAM531uxHDvTxYWFGO+cU8bSjTD+BBOnHRMAardprXalId64UD/cVMt js7yugVa437MxdnYQhuaXuM5jvQMcHs4uIUmDHBcyollOyO4LA== X-Google-Smtp-Source: ABdhPJz1ZWG4NTbjRUA1oomvDSddcwBW8wBFAJ+tSsdokbIzmQmAt4khwiC1HgI+FGIt4PB6SYcnM1ZJUtoWkMpEnYI= X-Received: by 2002:a19:5206:: with SMTP id m6mr19803lfb.367.1604532392064; Wed, 04 Nov 2020 15:26:32 -0800 (PST) MIME-Version: 1.0 From: Bernard Aboba Date: Wed, 4 Nov 2020 15:26:21 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="000000000000427ae505b3504fd0" Archived-At: Subject: [Webtransport] Reminder: Call for Agenda Items for IETF 109 WEBTRANS WG Meeting X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 Nov 2020 23:26:36 -0000 --000000000000427ae505b3504fd0 Content-Type: text/plain; charset="UTF-8" This is a reminder of the Call for Agenda items at the IETF 109 WEBTRANS WG Meeting. A tentative agenda is available for inspection here: https://codimd.ietf.org/notes-ietf-109-webtrans Draft slides are available here: https://docs.google.com/presentation/d/1zB6dcIOlKwZW8NUfYw-HtatNLpSJZBnrk-0ZpmSpfIQ/ The IETF WEBTRANS WG will meet on Monday, November 16 from 1 AM - 3 AM Pacific TIme. In other time zones, the meeting will occur on: Monday, November 16, 2020 from 09:00 - 11:00 (UTC) Monday, November 16, 2020 from 16:00 - 18:00 (Banghok). --000000000000427ae505b3504fd0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    This is a reminder of the Call for Agenda items at the IETF 109 W= EBTRANS WG Meeting.=C2=A0 A tentative agenda is available for inspection he= re:=C2=A0
    The IETF WEBTRANS WG will meet on= Monday, November 16 from 1 AM - 3 AM Pacific TIme.=C2=A0 In other time zon= es, the meeting will occur on:=C2=A0

    M= onday, November 16, 2020 from 09:00 - 11:00 (UTC)=C2=A0
    Monday, N= ovember 16, 2020 from 16:00 - 18:00 (Banghok).=C2=A0





    =


    --000000000000427ae505b3504fd0-- From nobody Wed Nov 4 17:38:00 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 593703A124E for ; Wed, 4 Nov 2020 17:37:59 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id TBF06Fy2i0fh for ; Wed, 4 Nov 2020 17:37:57 -0800 (PST) Received: from mail-lj1-x232.google.com (mail-lj1-x232.google.com [IPv6:2a00:1450:4864:20::232]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C2D2E3A124F for ; Wed, 4 Nov 2020 17:37:56 -0800 (PST) Received: by mail-lj1-x232.google.com with SMTP id y16so539435ljk.1 for ; Wed, 04 Nov 2020 17:37:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=izB8MStc42S2p8Qf9ZmEW0s+UhP0yrgJcqp/M2LFOCg=; b=CnEBx9eSprqu+NhkLhdeXc0Dpd2pub34ufiBR+M8B0sH5q2g99HtjIw5EV2wsBEkbv XKTv6NSXbv7l1z2iIpBY1+AwER93jtJ+MjRaVoLnyK3rCa6u/GqOF4sJ5HCTR33QvYdt tvuWfMpPBxa4OX7O1xGbHq9aHkLF0uQCVqNyhpUMtQIN2KMKXBxXTgUaeGnsoWuerStD BhkVe2xF/9uMNveXuPcB5iD6/DVhCOmTN8FXHJFcEjgG3vMMnVnsYnnsrrnRcWJq7vBC IHBK/th1vnZKKjTJ8eG8qWgHkZcwDFmDpy1foo6o02aH8TZ1c+uzbfnCrZnel3EBj/wL W+1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=izB8MStc42S2p8Qf9ZmEW0s+UhP0yrgJcqp/M2LFOCg=; b=pb6Dus3xKP/hAW/9YmmnTZr2Hv8aWsw+qO6PafYu1HfOPVGeRTU6usSKhHxs2BMFL0 VxfarCjBLiLPd7CGELN8ir1HEyaTOOGlEi/5hWGFnpGb0MAjzktyNSsOA5RVveWs++b0 SfrFaMGSf1/0XTh1r2+EgjghKdDy9E4OOWvJZqJkDoWHgvmmOW6im36mJVfGMP5Vyz1I mCbLc4makgvUIdtb0YJWnmoB1IYnBohwkEN6hS3CErUi7oJjtAS7TE0FUDYOm1zMc/PN ++SE9T9bsnlO5MFj4EdjJgVwQDEIuUK7tw51OmfPHeZGJX5PZm7rH5F63Wr1bNlQbFjd ZV3A== X-Gm-Message-State: AOAM531Pi0Kby6K2ds9r7ytWmLrhIUDT+CxrTZZYcO0wCYoHRQXQDhRO p6hlSIBOhO1k83RphwYjHaGczyzkvDt17G1g5JQ= X-Google-Smtp-Source: ABdhPJzP040JcJS+YZO14o0iocmGTevm0JgnB4trVPFAuwi27YMZu6F8q8Db35Muv/Rh4P4g/bqwHQsHdbUSvHCuM3s= X-Received: by 2002:a2e:9dc1:: with SMTP id x1mr6251ljj.240.1604540274756; Wed, 04 Nov 2020 17:37:54 -0800 (PST) MIME-Version: 1.0 References: <3ad5cc09-315b-ec3b-419d-807e5356b8a8@it.aoyama.ac.jp> <8854F1BE-31ED-4C06-9D43-D9EABE686F0B@apple.com> In-Reply-To: From: Bernard Aboba Date: Wed, 4 Nov 2020 17:37:44 -0800 Message-ID: To: Yutaka Hirano Cc: Eric Kinnear , WebTransport , Luke Curley , Lucas Pardue , =?UTF-8?Q?Martin_J=2E_D=C3=BCrst?= , Victor Vasiliev Content-Type: multipart/alternative; boundary="0000000000001ad09b05b3522563" Archived-At: Subject: Re: [Webtransport] Choosing the Transport, pt. 2 X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 01:37:59 -0000 --0000000000001ad09b05b3522563 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Yutaka said: "+1 to Victor. The server implementation cost is convincing to me." [BA] I (Chair hat off) agree with what Victor said in the paragraph below, but perhaps not for the same reasons. Victor said: "So I propose that we adapt all of them. As it stands, webtransport-quic is= a simple-to-implement and proven-to-work solution that should not require muc= h of working group's time. There are questions regarding whether webtransport-http is too complex; I believe that we won't know unless we try, and since there's clearly interest in trying, I believe we should adopt that draft and actually start working out those complex details." [BA] Sometimes it is easier to specify multiple (potentially competing) protocols rather than spend a lot of resources trying to figure out which one will eventually succeed. Once the protocols are specified the market often makes a very clearcut decision. For example, WebSockets over HTTP/2 hasn't gotten much traction. In this case, one of the transports (QuicTransport) is simple, so it's not like the WG will spend a lot of time and effort getting it to the point where implementers can get their hands on it, and decide if it is useful. It is nearly there now (it would be nice to have more choices for a QuicTransport server, but aioquic is usable today). Having QuicTransport is also convenient for testing the API, as well as gaining experience with WebTransport deployment in general. There may be some more work to do on QuicTransport in order to address some of the deployment problems with WebSockets (such as in draining and load balancing), but that's probably not too onerous and might also carry over to other transports. So the decision is really about going forward with HTTP/2 and HTTP/3. These will take more time and effort to get right and so there's a higher cost to working on them. But there still seems to be enough enthusiasm among the authors and implementers, and there are use cases that these transports seem uniquely able to address. They also have quite a bit in common. What use cases will be compelling enough to follow all the way through to implementation and deployment of the various transports is always a guessing game. I wonder whether QuicTransport will overcome the deficiencies of WebSockets and also whether the complexity of Http3Transport will eventually lead to simpler solutions being preferred. But those are engineering challenges that the WG can presumably recognize and work on solving, assuming we can get started and focus on them. One particular challenge that I see relates to the mixed HTTP/3 and WebTransport use cases. There seems to be quite a bit of enthusiasm about those, because they enable things that are not possible today while reusing HTTP infrastructure. But I suspect that most HTTP/3 servers will not be able to easily support the mixed HTTP/3 and WebTransport over HTTP/3 scenarios, and those that do (e.g. node.js) could take 18+ months at least. So Http3Transport could be a "late bloomer". On Thu, Oct 29, 2020 at 4:17 AM Yutaka Hirano wrote: > +1 to Victor. The server implementation cost is convincing to me. > > On Thu, Oct 29, 2020 at 3:43 AM Eric Kinnear 40apple.com@dmarc.ietf.org> wrote: > >> >> >> On Oct 28, 2020, at 2:03 AM, Luke Curley wrote: >> >> Sorry, I was trying to be too terse and should explain. >> >> The QuicTransport indication involves an origin and a path using a custo= m >> encoding. Like Victor mentioned, these are very similar to existing HTTP >> headers and could be encoded as such. This would reduce the differences >> between QuicTransport and Http3Transport. >> >> Http3Transport establishes the connection with HTTP headers but then >> ditches the HTTP semantics. It instead exposes the underlying QUIC >> connection and offers the same API as QUIC and QuicTransport. >> >> I was trying to express that QuicTransport and Http3Transport are >> converging. You can look at this in one of two ways: Either there's not >> enough differences to justify two protocols, or there are so few >> differences that they can share everything but the wire protocol. >> >> >> Just curious: if they share everything but the wire protocol, then are >> there significant use cases where we=E2=80=99d expect someone to need or= only >> support one wire protocol over another? In other words, if they share >> everything but a wire protocol, why do we need two wire protocols? >> (There may be completely sensible reasons for this, just thought I=E2=80= =99d ask >> since I thought we=E2=80=99d previously been discussing choosing one or = the other >> as a layering decision, rather than maintaining both.) >> >> Thanks, >> Eric >> >> >> On Tue, Oct 27, 2020 at 10:40 PM Martin J. D=C3=BCrst >> wrote: >> >>> On 28/10/2020 09:34, Luke Curley wrote: >>> > Yeah, I definitely agree that there's a grey area between >>> QuicTransport and >>> > Http3Transport. The QuicTransport indication is similar to HTTP, whil= e >>> > HttpTransport behaves like QUIC. >>> >>> I'm confused by the last sentence. Reformatting it, it reads: >>> >>> The QuicTransport indication is similar to HTTP, >>> while HttpTransport behaves like QUIC. >>> >>> Is that a typo, or does this crossover naming carry some deep >>> philosophical meaning that I didn't get? >>> >>> Regards, Martin. >>> >>> > But I think the decision to implement multiple protocols needs to be >>> more >>> > objective. Every WebTransport variant should add functionality or >>> provide >>> > backwards compatibility. Otherwise we'll be defining and implementing >>> > standards that serve no purpose. >>> >>> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> >> >> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --0000000000001ad09b05b3522563 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Yutaka said:=C2=A0
    <= br>
    "+1 to Victor. The server implementation cost is convinc= ing=C2=A0to me."=C2=A0

    [BA]=C2=A0 I (Chair ha= t off) agree with what Victor said in the paragraph below, but perhaps not = for the same reasons.=C2=A0=C2=A0

    Victor said= :=C2=A0

    "= So I propose that we adapt all of them. As it stands, webtransport-quic is= a simple-to-implement and prove= n-to-work solution that should not require much of working group= 's time. There are questions regarding whether
    =
webtransport-http is too complex; I believe that we won't know unless w=
e try, and since there's clearly interest in trying, I believe we shoul=
d adopt that draft and actually start working out those complex details."

    [BA] Sometimes it= is easier to specify multiple (potentially competing) protocols rather tha= n spend a lot of resources=C2=A0trying to figure out which one will eventua= lly succeed. Once the protocols are specified the market often makes a very= clearcut decision. For example, WebSockets over HTTP/2 hasn't gotten m= uch traction.=C2=A0

    In this case, one of the t= ransports (QuicTransport) is simple, so it's not like the WG will spend= a lot of time and effort getting it to the point where implementers can ge= t their hands on it, and decide if it is useful.=C2=A0 It is nearly there n= ow (it would be nice to have more choices for a QuicTransport server, but a= ioquic is usable today).=C2=A0 Having QuicTransport is also convenient for = testing=C2=A0the API, as well as gaining experience with WebTransport deplo= yment in general.=C2=A0 There may be some more work to do on QuicTransport = in order to address some of the deployment problems with WebSockets (such a= s in draining and load balancing), but that's probably not too onerous = and might also carry over to other transports.

    So = the decision is really about going forward with HTTP/2 and HTTP/3. These wi= ll take more time and effort to get right and so there's a higher cost = to working on them. But there=C2=A0still seems to be enough enthusiasm amon= g the authors and implementers, and there are use cases that these transpor= ts seem uniquely able to address. They also have quite a bit in common.=C2= =A0

    What use cases will be compelling enough to fo= llow all the way through to implementation and deployment of the various tr= ansports is always a guessing game.=C2=A0 I wonder whether QuicTransport wi= ll overcome the deficiencies of WebSockets and also whether the complexity = of Http3Transport will eventually lead to simpler solutions being preferred= . But those are engineering challenges that the WG can presumably recognize= and work on solving, assuming we can get started and focus on them.=C2=A0<= /div>

    One particular challenge that I see relates to the= mixed HTTP/3 and WebTransport use cases.=C2=A0 There seems to be quite a b= it of enthusiasm about those, because they enable things that are not possi= ble today while reusing HTTP infrastructure. But I suspect that most HTTP/3= servers will not be able to easily support the mixed HTTP/3 and WebTranspo= rt over HTTP/3 scenarios, and those that do (e.g. node.js) could take 18+ m= onths at least. So Http3Transport=C2=A0could be a "late bloomer".= =C2=A0


    On Thu, Oct 29, 2020 at 4:17 AM Yuta= ka Hirano <yhirano=3D40go= ogle.com@dmarc.ietf.org> wrote:
    +1 to Victor. The server implementatio= n cost is convincing to me.

    <= div dir=3D"ltr" class=3D"gmail_attr">On Thu, Oct 29, 2020 at 3:43 AM Eric K= innear <ekinnear=3D40apple.com@dmarc.ietf.org> wrote:


    On Oct 28, 2020, at 2:03 AM, Luke Curley <kixelated@gmail.com> wrote:
    Sorry, I was trying to be too terse and = should explain.

    The QuicTransport indication invol= ves an origin and a path using a custom encoding. Like Victor mentioned, th= ese are very similar to existing HTTP headers and could be encoded as such.= This would reduce the differences between QuicTransport and Http3Transport= .

    Http3Transport establishes the connection with= =C2=A0HTTP headers but then ditches the HTTP semantics. It instead exposes = the underlying QUIC connection and offers the same API as QUIC and QuicTran= sport.

    I was=C2=A0trying to express that QuicTrans= port and Http3Transport are converging. You can look at this in one of two = ways: Either there's not enough differences to justify two protocols, o= r there are so few differences that they can share everything but the wire = protocol.

    Just curious: if the= y share everything but the wire protocol, then are there significant use ca= ses where we=E2=80=99d expect someone to need or only support one wire prot= ocol over another? In other words, if they share everything but a wire prot= ocol, why do we need two wire protocols?=C2=A0
    (There may be comp= letely sensible reasons for this, just thought I=E2=80=99d ask since I thou= ght we=E2=80=99d previously been discussing choosing one or the other as a = layering decision, rather than maintaining both.)

    = Thanks,
    Eric


    On Tue, Oct 2= 7, 2020 at 10:40 PM Martin J. D=C3=BCrst <duerst@it.aoyama.ac.jp> wrote:
    On 28/10/2020 09:34, Lu= ke Curley wrote:
    > Yeah, I definitely agree that there's a grey area between QuicTran= sport and
    > Http3Transport. The QuicTransport indication is similar to HTTP, while=
    > HttpTransport behaves like QUIC.

    I'm confused by the last sentence. Reformatting it, it reads:

    The=C2=A0 =C2=A0QuicTransport indication is similar to HTTP,
    while HttpTransport behaves=C2=A0 =C2=A0 =C2=A0 =C2=A0like=C2=A0 =C2=A0 =C2= =A0 =C2=A0QUIC.

    Is that a typo, or does this crossover naming carry some deep
    philosophical meaning that I didn't get?

    Regards,=C2=A0 =C2=A0Martin.

    > But I think the decision to implement multiple protocols needs to be m= ore
    > objective. Every WebTransport variant should add functionality or prov= ide
    > backwards compatibility. Otherwise we'll be defining and implement= ing
    > standards that serve no purpose.

    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org= /mailman/listinfo/webtransport

    --=
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --0000000000001ad09b05b3522563-- From nobody Mon Nov 9 10:32:54 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BCF1E3A12B9 for ; Mon, 9 Nov 2020 10:32:52 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vHvOnsY-XP1m for ; Mon, 9 Nov 2020 10:32:51 -0800 (PST) Received: from mail-lf1-x12c.google.com (mail-lf1-x12c.google.com [IPv6:2a00:1450:4864:20::12c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 50FB03A12B8 for ; Mon, 9 Nov 2020 10:32:51 -0800 (PST) Received: by mail-lf1-x12c.google.com with SMTP id j205so6470449lfj.6 for ; Mon, 09 Nov 2020 10:32:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=90vq9jeEaso4rA/kh9k9WxJrynU8ccY0wxZv4ci++hk=; b=IlPBDufF+5DygJpUW1e2DWyPqNHVjEDzdXl10f26Gu3mU2wLajWYtus7LfUEp89QEV CtfWDgo2r9XJSt5MLLDypPca+rjp77JQrJ8NzVOuUbKTf0kWAAF/cE3IhuxBBKeEueMB HXUaIpj3Uc7RlJbGmiys0oeoXQOAGi0QcoNGZtxIoqry2FShAmoAGWLHfonvl3kS9xSv z4K3pAHNWck40vkx31peLQMvxiAjwYN2uTepjETyfHvoOE2UZTASYWQdaQXSEI0zJ9Iv NW+WYps2IWNgCmuxJkbIpkmM0Y6/tDbsOojtletc74GMvNRZrCdTW7iHi0hV4NVMiBBU OviA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=90vq9jeEaso4rA/kh9k9WxJrynU8ccY0wxZv4ci++hk=; b=ekoovcD2fM+5P9vUQNmxo9ecKJVL/3ofRzLn3t6zkXMMgRG+7ykYlCxjokt8CXeRIF qvImV7j1y8QCbnyWGmX6hynfiPyJarAQUEp19keLulINdSILAMobzbz/ZIqTNBVNrgjc MyYNvhE/vMy4ivVa5tnx+93mzkp1X3b84FztFlfySCMc8Ivkg1CQlTfOIwR/J9MKBREu gp9VTdcmDhkN7h+8fqvFSklHpw//VBoXbDx9AuUEQprreOSGsy7O+ihKsjl+SxVvPZ8o 7pLXEdz+1DsvwOEHCIyd/Tla3GGku7c+iPW0kEvtDRYXY0cHoRZalOVd8Pd7auXi5fmi bU0g== X-Gm-Message-State: AOAM533AhmSBJpGgUHonsPhBAlPk+2bN96huhhaX10jl+dGtGIWm95aV OPvUl0ZUD28od+rDJ3PQKeRuIcnjnLJxu3Q9BQJvcI/v+tOThQ== X-Google-Smtp-Source: ABdhPJzx8t300apWTpJ14Ycng+2+H4PxfYg9/9EojRZcuDFmnup7xU/TwX2gfmaHJnMEVebMA8Zr5/fctGo/OEEiBaw= X-Received: by 2002:ac2:53ad:: with SMTP id j13mr3762577lfh.177.1604946769178; Mon, 09 Nov 2020 10:32:49 -0800 (PST) MIME-Version: 1.0 From: Bernard Aboba Date: Mon, 9 Nov 2020 10:32:38 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="0000000000000f793e05b3b0caf1" Archived-At: Subject: [Webtransport] Http3Transport pooling/sharing X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Nov 2020 18:32:53 -0000 --0000000000000f793e05b3b0caf1 Content-Type: text/plain; charset="UTF-8" One of the use cases that has been described in the recent W3C WebTransport WG meeting was sharing of an HTTP/3 QUIC connection between HTTP/3 Request/Response and WebTransport. In looking into how this would work in practice, it appears that there are some complications. Http3Transport requires support for HTTP/3 Datagrams. draft-vvv-webtransport-http3 Section 4.1 says: "If "http3_transport_support" is negotiated, support for the QUIC DATAGRAM extension MUST be negotiated." What happens if there is an existing HTTP/3 connection to the same Origin but that connection did not negotiate support for QUIC DATAGRAMS? --0000000000000f793e05b3b0caf1 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    One of the use cases tha= t has been described in the recent W3C WebTransport WG meeting was sharing = of an HTTP/3 QUIC connection between HTTP/3 Request/Response and WebTranspo= rt.=C2=A0

    In looking into how this would work in practic= e, it appears that there are some complications.=C2=A0

    =
    Http3Transport requ= ires support for HTTP/3 Datagrams.=C2=A0draft-vvv-webtransport-http3 Section 4.1 says:

    "If "http3_transport_support&= quot; is negotiated, support for the QUIC DATAGRAM extension MUST be negoti= ated."

    What= happens if there is an existing HTTP/3 connection=C2=A0to the same Origin but that connecti= on did not negotiate support for QUIC DATAGRAMS?
    --0000000000000f793e05b3b0caf1-- From nobody Mon Nov 9 19:18:55 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A6BA03A10E8 for ; Mon, 9 Nov 2020 19:18:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=lowentropy.net header.b=HMAhCiOV; dkim=pass (2048-bit key) header.d=messagingengine.com header.b=OoiJjpLT Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ghx2jIPhLr67 for ; Mon, 9 Nov 2020 19:18:52 -0800 (PST) Received: from out2-smtp.messagingengine.com (out2-smtp.messagingengine.com [66.111.4.26]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5E2AA3A108A for ; Mon, 9 Nov 2020 19:18:52 -0800 (PST) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id 8E5055C015E for ; Mon, 9 Nov 2020 22:18:51 -0500 (EST) Received: from imap10 ([10.202.2.60]) by compute1.internal (MEProxy); Mon, 09 Nov 2020 22:18:51 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lowentropy.net; h=mime-version:message-id:in-reply-to:references:date:from:to :subject:content-type; s=fm3; bh=KKJPR7KoXZqBoV6kNESLqaXKY6x+dWQ Ae/ykVfEOIEQ=; b=HMAhCiOVArJt2HGFYJXaKWqT8oFIkr/GBlVM4/lBUXVmrbN Q051P8Q/0AfL32y2/vBfyQ3gbz1fuU/8p2BWB2T+pUkEfJ+WA3/8oErfurKEQGlT t0SidyUitIqrSgOAHFg2sIAR4+vVr8cQCNVx7v0ReQkmbmkWTmZlwekVeM4NZkC/ GGIvmiYAGRGDBFRD+tYDLLIJYFs07T2saE5Wgpltt9+Ujq92O7eRNuHXIeq6XK91 aSUbaGCRo/ZHXUL0Q6acZyJmqJcCYFLonMZkmkvAeNFqW9fifoYOei6u/y6JE0Mb COKTS/AgzZahf5seAjGhDKR9qKiVVp/Zif4NFHQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=KKJPR7 KoXZqBoV6kNESLqaXKY6x+dWQAe/ykVfEOIEQ=; b=OoiJjpLTMHvO0MuvpBDfgV BP6mMcRe0kAqmVwQu01/KEVgtgGJVBKqWImfQyyOTsYMFi9GDj1Zo/m4WA8bpn4b wUnmBewxG1EdLbCd4Xw8uZLvXXzXMz6AWX/pqzThwylAZMbxnxvivILrM+Wj+5QC mPz1LguODQ57+CYMojPA+parmv+U9Dgb4Jd3ntCnrKJJoidv9bHmmufDoWxBTmDz 4CMBFvE3RROaxghqSATaETnKSryLYinAGPPFzSEuGFeW4Mj5QD5y2U/NgWG+9+ew CJk9k0eZPytbF0bdJKgBOsQxHmWOUl0aT5qDZd9v8bcVYPsjLDngnrfvYDfOOFag == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedujedrudduiedgheelucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucenucfjughrpefofgggkfgjfhffhffvufgtsehttd ertderredtnecuhfhrohhmpedfofgrrhhtihhnucfvhhhomhhsohhnfdcuoehmtheslhho figvnhhtrhhophihrdhnvghtqeenucggtffrrghtthgvrhhnpeekjeevvedvvdehveeije egffehheetgfetvedtgfeljeegkedutdehudetueeigfenucffohhmrghinhephhhtthhp fehrvghquhgvshhtrhgvshhpohhnshgvrghnugifvggsthhrrghnshhpohhrthdrihhnpd hivghtfhdrohhrghenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhl fhhrohhmpehmtheslhhofigvnhhtrhhophihrdhnvght X-ME-Proxy: Received: by mailuser.nyi.internal (Postfix, from userid 501) id EE8632038B; Mon, 9 Nov 2020 22:18:50 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.3.0-570-gba0a262-fm-20201106.001-gba0a2623 Mime-Version: 1.0 Message-Id: <2759a04d-949e-45ed-86db-bd499b7cff19@www.fastmail.com> In-Reply-To: References: Date: Tue, 10 Nov 2020 14:18:29 +1100 From: "Martin Thomson" To: webtransport@ietf.org Content-Type: text/plain Archived-At: Subject: Re: [Webtransport] Http3Transport pooling/sharing X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Nov 2020 03:18:54 -0000 There is a common problem with piecemeal negotiation. I can imagine several responses to the case where you have an existing connection that doesn't support the features you want. 1. Fail. 2. Make a new connection. 3. Synthesize datagram support (probably not worth it). Failing isn't completely unreasonable. If the connection doesn't have the features you need, and you have no reason to believe that the negotiation would be different next time, then this is a good reaction. Of course, you need to be offering datagram support when you make the original connection, even if you are not currently aware of the need for the feature. The quote you provide indicates doesn't seem at all problematic: both features are negotiated at the same time, and one requires the other. This is not particularly difficult to arrange. There is a more difficult problem to address: what if you have a connection to a server that supports h2 and webtransport, but you get Alt-Svc indicating support for h3. Do you upgrade? What if the upgraded service doesn't support webtransport? If, at the time you upgrade, you don't know, it seems reasonable to upgrade. But then if you later learn that you need webtransport, what then? On Tue, Nov 10, 2020, at 05:32, Bernard Aboba wrote: > One of the use cases that has been described in the recent W3C > WebTransport WG meeting was sharing of an HTTP/3 QUIC connection > between HTTP/3 Request/Response and WebTransport. > > In looking into how this would work in practice, it appears that there > are some complications. > > Http3Transport requires support for HTTP/3 Datagrams. > draft-vvv-webtransport-http3 Section 4.1 says: > "If "http3_transport_support" is negotiated, support for the QUIC > DATAGRAM extension MUST be negotiated." > > What happens if there is an existing HTTP/3 connection to the same > Origin but that connection did not negotiate support for QUIC DATAGRAMS? > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > From nobody Mon Nov 9 19:44:31 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EA1623A0603 for ; Mon, 9 Nov 2020 19:44:29 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.847 X-Spam-Level: X-Spam-Status: No, score=-1.847 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id acDQDn5bR6NB for ; Mon, 9 Nov 2020 19:44:28 -0800 (PST) Received: from mail-ej1-x62f.google.com (mail-ej1-x62f.google.com [IPv6:2a00:1450:4864:20::62f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2910E3A05D0 for ; Mon, 9 Nov 2020 19:44:28 -0800 (PST) Received: by mail-ej1-x62f.google.com with SMTP id me8so5990587ejb.10 for ; Mon, 09 Nov 2020 19:44:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=K1V2LsYDz2VwceMuLmSqrWd8pmwy7o0oIzgAjnBQtBE=; b=pzrTaIuFWrcOUVJi2Nn5sHo1QzYH61reAQlTMt8hvwGdwyqgJ7I7HDZkeh7TjuwIMr tEMpjCd9lWVVKNM6V38tmTageDg72K3aWd5bf+hSlZ8u+owX6E8+qKJDZJ+OeEzsmERh pgXp2/nzbpvNVk3u0cUOBkaKHfxtHI874zvbiKM3cUCREUxW+dsrMcEH8fde/2lzmDz6 VMeKyZiuyPDAbZq58lccUhcIRrSPI5WKXTofmHNs7jRxSzz55f/DMkGCF7ZXZsxxrHy+ cCwTif6P2HAUbGrpmGzNCLsyTLlukfFPVQqn64e6zaRiWtQYPkrcqAwIS5IcW+AcLvGn DwkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=K1V2LsYDz2VwceMuLmSqrWd8pmwy7o0oIzgAjnBQtBE=; b=WU9bQT0xI/J00IlW6N0uyc084L9ZwNwdpz5K2pgS11Ajukxq/x411PT9OKHd45Na0f sgBHsQ4aZzFfH8tEfcIGLa7XP+wwysGP7PMhd27TXEq+6Qxgq6AAAWdhY4kXdUTfbYf7 yLJoDloO80MnDx7dXYbxqTTMQrsIw/yiwpwK2418qXfspDbrJQlfe2hdpaBrYU5Rjo3x aUKKSRIQ3b5hqWAKyq+LZ8p8uPiX5XeZ+cTFxNkC93DmPymUOs5AVA7261ZPvYveKBpR kakBkJsB5TAX04KInfPqRDuqgtn9vUbHVL4Ev5fASqe53xTvTWbM6TFrPIBLl5TEMDRV YdJg== X-Gm-Message-State: AOAM533fDS0XK+PAzD4h5qfPNOWOh31ygTHhCICL0xqdamGp+jE/m8Vc Fm6OFdT0PAKk+/hEzHKvuLmBwym4dBSICiFpdxrvHUk1 X-Google-Smtp-Source: ABdhPJwcT4oaPzNJkSvp6Kj3iWQvukYj8b+L/hh1mbw17gf0JxEtltH24QwNtOU7EIrNQ2B5TOQcaNKKn3QZ2rKRP6A= X-Received: by 2002:a17:906:3b81:: with SMTP id u1mr17908931ejf.542.1604979866563; Mon, 09 Nov 2020 19:44:26 -0800 (PST) MIME-Version: 1.0 References: <2759a04d-949e-45ed-86db-bd499b7cff19@www.fastmail.com> In-Reply-To: <2759a04d-949e-45ed-86db-bd499b7cff19@www.fastmail.com> From: Lucas Pardue Date: Tue, 10 Nov 2020 03:44:19 +0000 Message-ID: To: Martin Thomson Cc: WebTransport Content-Type: multipart/alternative; boundary="000000000000d1772305b3b87e8b" Archived-At: Subject: Re: [Webtransport] Http3Transport pooling/sharing X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Nov 2020 03:44:30 -0000 --000000000000d1772305b3b87e8b Content-Type: text/plain; charset="UTF-8" On Tue, 10 Nov 2020, 03:18 Martin Thomson, wrote: > There is a common problem with piecemeal negotiation. I can imagine > several responses to the case where you have an existing connection that > doesn't support the features you want. > > 1. Fail. > 2. Make a new connection. > 3. Synthesize datagram support (probably not worth it). > > Failing isn't completely unreasonable. If the connection doesn't have the > features you need, and you have no reason to believe that the negotiation > would be different next time, then this is a good reaction. Of course, you > need to be offering datagram support when you make the original connection, > even if you are not currently aware of the need for the feature. > > The quote you provide indicates doesn't seem at all problematic: both > features are negotiated at the same time, and one requires the other. This > is not particularly difficult to arrange. > > There is a more difficult problem to address: what if you have a > connection to a server that supports h2 and webtransport, but you get > Alt-Svc indicating support for h3. Do you upgrade? What if the upgraded > service doesn't support webtransport? If, at the time you upgrade, you > don't know, it seems reasonable to upgrade. But then if you later learn > that you need webtransport, what then? > +1, especially that last part. Things gets thorny with support of extensions across HTTP versions. I started on draft-pardue-alt-svc-ext-unsupported [1] to explain some of this, with the mere solution of coining an error code. I didn't have a strong problem case for it to apply to yet so it's been sat idle... Cheers, Lucas https://datatracker.ietf.org/doc/draft-pardue-alt-svc-ext-unsupported/ > --000000000000d1772305b3b87e8b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


    On Tue, 10 Nov 2020, 03:18 Martin Thomson, <mt@lowentropy.net> wrote:
    There is a common problem with piecemeal negoti= ation.=C2=A0 I can imagine several responses to the case where you have an = existing connection that doesn't support the features you want.

    1. Fail.
    2. Make a new connection.
    3. Synthesize datagram support (probably not worth it).

    Failing isn't completely unreasonable.=C2=A0 If the connection doesn= 9;t have the features you need, and you have no reason to believe that the = negotiation would be different next time, then this is a good reaction.=C2= =A0 Of course, you need to be offering datagram support when you make the o= riginal connection, even if you are not currently aware of the need for the= feature.

    The quote you provide indicates doesn't seem at all problematic: both f= eatures are negotiated at the same time, and one requires the other.=C2=A0 = This is not particularly difficult to arrange.

    There is a more difficult problem to address: what if you have a connection= to a server that supports h2 and webtransport, but you get Alt-Svc indicat= ing support for h3.=C2=A0 Do you upgrade?=C2=A0 What if the upgraded servic= e doesn't support webtransport?=C2=A0 If, at the time you upgrade, you = don't know, it seems reasonable to upgrade.=C2=A0 But then if you later= learn that you need webtransport, what then?
    <= div dir=3D"auto">
    +1, especially that last part.=

    Things gets thorny with= support of extensions across HTTP versions. I started on=C2=A0draft-pardue-alt-svc-ext-unsupported=C2= =A0[1] to explain some of this, with the mere solution of coining an error = code. I didn't have a strong problem case for it to apply to yet so it&= #39;s been sat idle...

    C= heers,=C2=A0
    Lucas=C2=A0

    =
    --000000000000d1772305b3b87e8b-- From nobody Mon Nov 9 21:05:16 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 13C5A3A0CF4 for ; Mon, 9 Nov 2020 21:05:16 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.598 X-Spam-Level: X-Spam-Status: No, score=-1.598 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, GB_ABOUTYOU=0.5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=lowentropy.net header.b=UVpl08T0; dkim=pass (2048-bit key) header.d=messagingengine.com header.b=bfUkqu/H Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Aqezlxz7jK8A for ; Mon, 9 Nov 2020 21:05:14 -0800 (PST) Received: from out3-smtp.messagingengine.com (out3-smtp.messagingengine.com [66.111.4.27]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 791E03A0CFE for ; Mon, 9 Nov 2020 21:05:14 -0800 (PST) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id 9D6C55C01D2 for ; Tue, 10 Nov 2020 00:05:13 -0500 (EST) Received: from imap10 ([10.202.2.60]) by compute1.internal (MEProxy); Tue, 10 Nov 2020 00:05:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lowentropy.net; h=mime-version:message-id:in-reply-to:references:date:from:to :subject:content-type:content-transfer-encoding; s=fm3; bh=7l8VF VYUaNn75za+Abp3z7AxmarOSc5bXm0vlcZKz+c=; b=UVpl08T0Buyi8gH+DsPhD sXIbIwzQXnLKkirbkBKzpvCOGPQG5z1OmEqEgbSpx8TA6bw51Cj/mHvPwLmps4hi 7Z1s011pLP/8CRkeO3w+7rbbJuye7xKAVJEaXcqsXiUqeC9hktqIcxsWHK82Bjbf BkK535iqLYewsKbuQKhGlEPxRyqCiCi4rKHfK6ZWiRHdTZiOCmaGiJJVnYq3qky5 l0TKBDD7i3XAKWXseLqy+LL+josK/ZF8bqCQXh4lKGlfkNL2N/PLAKcAoQHC5wOh FdOajHV9KFVcMaJWVf/0RV/VNl6KnbhpsIygnHfZnQxCPlCwHO0k5Pyv6YCsQvAx g== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm1; bh=7l8VFVYUaNn75za+Abp3z7AxmarOSc5bXm0vlcZKz +c=; b=bfUkqu/H84fFqCubxGL4e1sEpCl092SIQz0bSNr0/5xM3Yq1TI5c5chPh /HY9chW6AqSTcuTxpwuoGpSlZ8GsNOJCBS+PUJvOmjblHIgK0d0xS7ZH+L2EBJYm DGANqbbi1xsxrV53dRMp+L6VBIrFX/hqhX0t63vlid7tcVkcfm1epBgp5wKx4iGz MBocLQkURdChisNO+cNQzKscZjJENwJTGz4p9d5qeBLKgoGDAGIoTEf/8B/yGV89 crGXEtI272pozGQCrN/8afQ6M5JUNvombPcwaPgFsFpjDVtxe47Rstqa065tiTnz jzgUxJGVosjNZt7EOtIOlMzuJ83+A== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedujedrudduiedgkedtucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucenucfjughrpefofgggkfgjfhffhffvufgtgfesth hqredtreerjeenucfhrhhomhepfdforghrthhinhcuvfhhohhmshhonhdfuceomhhtsehl ohifvghnthhrohhphidrnhgvtheqnecuggftrfgrthhtvghrnhepieehgffgvddtkeduie eufedtteetueehkeeihedtgfffudeggeeiuddtudfguedtnecuffhomhgrihhnpehivght fhdrohhrghdpghhithhhuhgsrdgtohhmnecuvehluhhsthgvrhfuihiivgeptdenucfrrg hrrghmpehmrghilhhfrhhomhepmhhtsehlohifvghnthhrohhphidrnhgvth X-ME-Proxy: Received: by mailuser.nyi.internal (Postfix, from userid 501) id 33D8320373; Tue, 10 Nov 2020 00:05:13 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.3.0-570-gba0a262-fm-20201106.001-gba0a2623 Mime-Version: 1.0 Message-Id: <98dfa9e0-6a37-4b79-9eb5-b4bbf8b6850d@www.fastmail.com> In-Reply-To: References: Date: Tue, 10 Nov 2020 16:04:52 +1100 From: "Martin Thomson" To: webtransport@ietf.org Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable Archived-At: Subject: Re: [Webtransport] Choosing the Transport, pt. 2 X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Nov 2020 05:05:16 -0000 Hey Victor, I have a hard time understanding this. If I recall correctly, your original proposal involved multiple protocol= s. So this sounds like you have discovered something that supports that= view, or at least has consolidated your own opinion. But I don't see a= ny actual evidence here to support building multiple protocols. Building one protocol is hard enough. It seems like we signed on to do = two here, on the basis that we need a fallback. But I don't see how tha= t naturally extends to three. On the contrary, just one protocol is pre= tty tempting at this point. TCP fallback could be handled by a websocke= ts polyfill outside of the browser (or a WebRTC polyfill for those who a= re less complexity-averse). It seems your arguments are based on it being possible to hide a bunch o= f this complexity under a unified API. That's great, but it doesn't mea= n that the abstraction won't leak. I'm sure that running over h2 will l= ook very different to running on bare QUIC. That doesn't meant that I'm not curious about your semantic unification = idea. I don't understand that either, but it's an abstract notion with = some appeal to me. Cheers, Martin On Wed, Oct 28, 2020, at 03:22, Victor Vasiliev wrote: > (previous iteration of this thread here=20 > ) >=20 > Hello everyone, >=20 > As you might remember, we've still not decided which of QuicTransport,= =20 > Http2Transport and Http3Transport we should adapt: > 1. There has been a strong interest in running WebTransport over HTTP= .=20 > HTTP allows us to do connection pooling, a well-understood mechanism o= f=20 > falling back to TCP and better integration with existing load balancer= s. > 2. There has also been interest in running WebTransport over QUIC=20 > itself, due to the complexity of WebTransport over HTTP, both in terms= =20 > of design and in terms of writing servers for it (nice discussion here= =20 > ). > 3. There has been a desire to pick only one of those. > I've been reworking =20= > the QuicTransport draft based on what we've found while implementing i= t=20 > in Chrome. Doing that, and observing how it becomes more and more lik= e=20 > HTTP with every revision, has convinced me more than ever that all of=20= > the transports above should be the same thing conceptually, differing=20= > only in wire protocol. That observation was very helpful, since it=20= > allowed us to replace = =20 > all of the different API entry points with just one, already=20 > dramatically simplifying the situation. Same observation also can=20 > potentially help us make some progress here. We can unify all of the=20= > proposals semantically (make them share a URL scheme and the headers=20= > format), and then the variants just become different encodings. >=20 > If we compare the WebTransport proposals to the HTTP ecosystem, beside= s=20 > the obvious equivalences (webtransport-http2 =E2=89=85 HTTP/2,=20 > webtransport-http3 =E2=89=85 HTTP/3), it becomes apparent that=20 > webtransport-quic =E2=89=85 HTTP/1.1. This gives us a hint of why we = might=20 > want all three of those. This is also really nice, since we know how=20= > to switch between all of those protocols, and we have a lot of=20 > experience with an ecosystem shaped like that: webtransport-quic and=20= > webtransport-http3 can be switched via ALPN, webtransport-http2 can be= =20 > raced in parallel with the former. >=20 > So I propose that we adapt all of them. As it stands,=20 > webtransport-quic is a simple-to-implement and proven-to-work solution= =20 > that should not require much of working group's time. There are=20 > questions regarding whether webtransport-http is too complex; I believ= e=20 > that we won't know unless we try, and since there's clearly interest i= n=20 > trying, I believe we should adopt that draft and actually start workin= g=20 > out those complex details. >=20 > What does everyone think? >=20 > Cheers, > Victor. > --=20 > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > From nobody Tue Nov 10 08:38:09 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 21CD13A0A34 for ; Tue, 10 Nov 2020 08:38:08 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.597 X-Spam-Level: X-Spam-Status: No, score=-1.597 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, GB_ABOUTYOU=0.5, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id qSWvanMCa2dy for ; Tue, 10 Nov 2020 08:38:06 -0800 (PST) Received: from mail-lj1-x22c.google.com (mail-lj1-x22c.google.com [IPv6:2a00:1450:4864:20::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E731D3A0C8E for ; Tue, 10 Nov 2020 08:37:25 -0800 (PST) Received: by mail-lj1-x22c.google.com with SMTP id 11so15446394ljf.2 for ; Tue, 10 Nov 2020 08:37:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=WMRkrX8Wkftl6FKqm/bBYQyC4BBm/Y1K3HSxcHM/XWE=; b=bQcac/z4zUlXD5vw/wbMQz+793SbQICT6T1WFtdCbMP0bWfmldShCeP12n2rz7McuW Xfm53zD6LsqzCSO0tFdXsyvzltN2M7p6CyZfWGlAQX0jsBJQDvGxfBXeLQeKtQ1FVPis QSpAoAhT8gBrkucmbCbJQYOsZVU/DHDl58Vs9301COIbeifJH2v5SbT2dBRPkzUSdkob jL+MdLWr8oCJqrvdG9GIv8i6LgYOIZyq77UYqv5rf4YaizSApUM8zBa95NUDyCDsLCbq Cu0vLfcQZIS0dXhrAnGuwGgPSdsEGjDqB09eAB7yF3bkSoXeT8/ODPzgwW7g4rBIoM1Z gqsA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=WMRkrX8Wkftl6FKqm/bBYQyC4BBm/Y1K3HSxcHM/XWE=; b=ARMNAulWoWgEO4JoiehYgDCaMmx80Yuyj+nqZkTguAm2ft6EvLEu+EXwQLeFcSZRyI UecHXeauBhBlSx2xua5IW7iK3zeVipiQcfTqGlNVRCUCg9UMczKNBTWds0skowLsIJED gdA+FwNBRlSwF4zGSMUSf8eCMZBsgXGhJfOPtRZ3GN0k/SnCstq6o3KuNN4EeCsm0I3E 6AFik+qzROq8/W70FbWjrYzGRiS4Tb3/aj9g3tyMWZnHIP9g/8CUOTViXMuMugqs95cs KQl1DU2vGB/dwbBQ8MF0HBrkXAdTO4jjDMoO7cjHeblIDTlZ9drpecwXZkop8sMn/bbG i2CA== X-Gm-Message-State: AOAM533cYQJeyTfwy4m/8oZv3mO3qU5gJWUtrqu1cxbriBxDXIePyGH9 igLcCrorIu7axemKMW2EEoNKzqojF8AWQjP9mdy0E6dbGVDcVg== X-Google-Smtp-Source: ABdhPJxAyt3qPEbn9lIUkPFdElTQtEQA5sMAjnZenyXa2h2An6y0z3BGUtpCXr2SgrvZSGyE54C4ZFBam5q5Nw5i/u4= X-Received: by 2002:a2e:7216:: with SMTP id n22mr9147804ljc.187.1605026243642; Tue, 10 Nov 2020 08:37:23 -0800 (PST) MIME-Version: 1.0 References: <98dfa9e0-6a37-4b79-9eb5-b4bbf8b6850d@www.fastmail.com> In-Reply-To: <98dfa9e0-6a37-4b79-9eb5-b4bbf8b6850d@www.fastmail.com> From: Bernard Aboba Date: Tue, 10 Nov 2020 08:37:13 -0800 Message-ID: To: Martin Thomson Cc: WebTransport Content-Type: multipart/alternative; boundary="0000000000001b8a3a05b3c34b06" Archived-At: Subject: Re: [Webtransport] Choosing the Transport, pt. 2 X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Nov 2020 16:38:08 -0000 --0000000000001b8a3a05b3c34b06 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Martin said: "It seems your arguments are based on it being possible to hide a bunch of this complexity under a unified API. That's great, but it doesn't mean that the abstraction won't leak. I'm sure that running over h2 will look very different to running on bare QUIC." [BA] There is a question whether h2 is supported within the WebTransport API: https://github.com/w3c/webtransport/issues/164 Part of the concern is the complexity that would be added by supporting failover within the API, rather than outside of it. Currently, if QUIC and associated functionality (such as datagram support) cannot be negotiated, the WebTransport constructor will fail. Among other things this implies that if the WebTransport constructor succeeds and the ready promise is resolved, that the datagramWritable and datagramReadable attributes are always defined. It does not make sense to me to pretend that datagram functionality is available when running over a transport that does not support datagrams. On Mon, Nov 9, 2020 at 9:05 PM Martin Thomson wrote: > Hey Victor, > > I have a hard time understanding this. > > If I recall correctly, your original proposal involved multiple > protocols. So this sounds like you have discovered something that suppor= ts > that view, or at least has consolidated your own opinion. But I don't se= e > any actual evidence here to support building multiple protocols. > > Building one protocol is hard enough. It seems like we signed on to do > two here, on the basis that we need a fallback. But I don't see how that > naturally extends to three. On the contrary, just one protocol is pretty > tempting at this point. TCP fallback could be handled by a websockets > polyfill outside of the browser (or a WebRTC polyfill for those who are > less complexity-averse). > > It seems your arguments are based on it being possible to hide a bunch of > this complexity under a unified API. That's great, but it doesn't mean > that the abstraction won't leak. I'm sure that running over h2 will look > very different to running on bare QUIC. > > That doesn't meant that I'm not curious about your semantic unification > idea. I don't understand that either, but it's an abstract notion with > some appeal to me. > > Cheers, > Martin > > On Wed, Oct 28, 2020, at 03:22, Victor Vasiliev wrote: > > (previous iteration of this thread here > > < > https://mailarchive.ietf.org/arch/msg/webtransport/CEGNLkMqrvug3uPyPmQIXn= WVIAY/ > >) > > > > Hello everyone, > > > > As you might remember, we've still not decided which of QuicTransport, > > Http2Transport and Http3Transport we should adapt: > > 1. There has been a strong interest in running WebTransport over HTTP. > > HTTP allows us to do connection pooling, a well-understood mechanism of > > falling back to TCP and better integration with existing load balancers= . > > 2. There has also been interest in running WebTransport over QUIC > > itself, due to the complexity of WebTransport over HTTP, both in terms > > of design and in terms of writing servers for it (nice discussion here > > < > https://mailarchive.ietf.org/arch/msg/webtransport/O8P5nmmw0ywra1VWtJmS4l= BglhI/ > >). > > 3. There has been a desire to pick only one of those. > > I've been reworking > > the QuicTransport draft based on what we've found while implementing it > > in Chrome. Doing that, and observing how it becomes more and more like > > HTTP with every revision, has convinced me more than ever that all of > > the transports above should be the same thing conceptually, differing > > only in wire protocol. That observation was very helpful, since it > > allowed us to replace > > all of the different API entry points with just one, already > > dramatically simplifying the situation. Same observation also can > > potentially help us make some progress here. We can unify all of the > > proposals semantically (make them share a URL scheme and the headers > > format), and then the variants just become different encodings. > > > > If we compare the WebTransport proposals to the HTTP ecosystem, besides > > the obvious equivalences (webtransport-http2 =E2=89=85 HTTP/2, > > webtransport-http3 =E2=89=85 HTTP/3), it becomes apparent that > > webtransport-quic =E2=89=85 HTTP/1.1. This gives us a hint of why we m= ight > > want all three of those. This is also really nice, since we know how > > to switch between all of those protocols, and we have a lot of > > experience with an ecosystem shaped like that: webtransport-quic and > > webtransport-http3 can be switched via ALPN, webtransport-http2 can be > > raced in parallel with the former. > > > > So I propose that we adapt all of them. As it stands, > > webtransport-quic is a simple-to-implement and proven-to-work solution > > that should not require much of working group's time. There are > > questions regarding whether webtransport-http is too complex; I believe > > that we won't know unless we try, and since there's clearly interest in > > trying, I believe we should adopt that draft and actually start working > > out those complex details. > > > > What does everyone think? > > > > Cheers, > > Victor. > > -- > > Webtransport mailing list > > Webtransport@ietf.org > > https://www.ietf.org/mailman/listinfo/webtransport > > > > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --0000000000001b8a3a05b3c34b06 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Martin said:=C2=A0
    <= br>
    "It seems your arguments are based on it being possible = to hide a bunch of this complexity under a unified API.=C2=A0 That's gr= eat, but it doesn't mean that the abstraction won't leak.=C2=A0 I&#= 39;m sure that running over h2 will look very different to running on bare = QUIC."

    [BA] There is a question whether h2 is= supported within the WebTransport API:

    Part of the concern is the complexity th= at would be added by supporting failover within the API, rather than outsid= e of it.=C2=A0

    Currently, if QUIC and associated f= unctionality (such as datagram support) cannot be negotiated, the WebTransp= ort constructor will fail.=C2=A0 Among other things this implies that if th= e WebTransport constructor succeeds and the ready promise is resolved, that= the datagramWritable and datagramReadable attributes are always defined.= =C2=A0

    It does not make sense to me to pretend tha= t datagram functionality is available when running over a transport that do= es not support datagrams.=C2=A0

    On Mon, Nov 9, 2020 at 9:0= 5 PM Martin Thomson <mt@lowentropy.= net> wrote:
    Hey Victor,

    I have a hard time understanding this.

    If I recall correctly, your original proposal involved multiple protocols.= =C2=A0 So this sounds like you have discovered something that supports that= view, or at least has consolidated your own opinion.=C2=A0 But I don't= see any actual evidence here to support building multiple protocols.

    Building one protocol is hard enough.=C2=A0 It seems like we signed on to d= o two here, on the basis that we need a fallback.=C2=A0 But I don't see= how that naturally extends to three.=C2=A0 On the contrary, just one proto= col is pretty tempting at this point.=C2=A0 TCP fallback could be handled b= y a websockets polyfill outside of the browser (or a WebRTC polyfill for th= ose who are less complexity-averse).

    It seems your arguments are based on it being possible to hide a bunch of t= his complexity under a unified API.=C2=A0 That's great, but it doesn= 9;t mean that the abstraction won't leak.=C2=A0 I'm sure that runni= ng over h2 will look very different to running on bare QUIC.

    That doesn't meant that I'm not curious about your semantic unifica= tion idea.=C2=A0 I don't understand that either, but it's an abstra= ct notion with some appeal to me.

    Cheers,
    Martin

    On Wed, Oct 28, 2020, at 03:22, Victor Vasiliev wrote:
    > (previous iteration of this thread here
    > <https://mail= archive.ietf.org/arch/msg/webtransport/CEGNLkMqrvug3uPyPmQIXnWVIAY/>= )
    >
    > Hello everyone,
    >
    > As you might remember, we've still not decided which of QuicTransp= ort,
    > Http2Transport and Http3Transport we should adapt:
    >=C2=A0 1. There has been a strong interest in running WebTransport over= HTTP.
    > HTTP allows us to do connection pooling, a well-understood mechanism o= f
    > falling back to TCP and better integration with existing load balancer= s.
    >=C2=A0 2. There has also been interest in running WebTransport over QUI= C
    > itself, due to the complexity of WebTransport over HTTP, both in terms=
    > of design and in terms of writing servers for it (nice discussion here=
    > <https://mail= archive.ietf.org/arch/msg/webtransport/O8P5nmmw0ywra1VWtJmS4lBglhI/>= ).
    >=C2=A0 3. There has been a desire to pick only one of those.
    > I've been reworking <https://github.com/v= asilvv/webtransport/pull/18>
    > the QuicTransport draft based on what we've found while implementi= ng it
    > in Chrome.=C2=A0 Doing that, and observing how it becomes more and mor= e like
    > HTTP with every revision, has convinced me more than ever that all of =
    > the transports above should be the same thing conceptually, differing =
    > only in wire protocol.=C2=A0 That observation was very helpful, since = it
    > allowed us to replace <https://github.com/w3c/= webtransport/issues/129>
    > all of the different API entry points with just one, already
    > dramatically simplifying the situation.=C2=A0 Same observation also ca= n
    > potentially help us make some progress here.=C2=A0 We can unify all of= the
    > proposals semantically (make them share a URL scheme and the headers <= br> > format), and then the variants just become different encodings.
    >
    > If we compare the WebTransport proposals to the HTTP ecosystem, beside= s
    > the obvious equivalences (webtransport-http2 =E2=89=85 HTTP/2,
    > webtransport-http3 =E2=89=85 HTTP/3), it becomes apparent that
    > webtransport-quic =E2=89=85 HTTP/1.1.=C2=A0 This gives us a hint of wh= y we might
    > want all three of those.=C2=A0 This is also really nice, since we know= how
    > to switch between all of those protocols, and we have a lot of
    > experience with an ecosystem shaped like that: webtransport-quic and <= br> > webtransport-http3 can be switched via ALPN, webtransport-http2 can be=
    > raced in parallel with the former.
    >
    > So I propose that we adapt all of them.=C2=A0 As it stands,
    > webtransport-quic is a simple-to-implement and proven-to-work solution=
    > that should not require much of working group's time.=C2=A0 There = are
    > questions regarding whether webtransport-http is too complex; I believ= e
    > that we won't know unless we try, and since there's clearly in= terest in
    > trying, I believe we should adopt that draft and actually start workin= g
    > out those complex details.
    >
    > What does everyone think?
    >
    > Cheers,
    >=C2=A0 =C2=A0Victor.
    > --
    > Webtransport mailing list
    > Webtranspor= t@ietf.org
    > https://www.ietf.org/mailman/listinfo/webtran= sport
    >

    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --0000000000001b8a3a05b3c34b06-- From nobody Tue Nov 10 08:51:57 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B20513A0AA3 for ; Tue, 10 Nov 2020 08:51:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id AdCiAZgA_fnx for ; Tue, 10 Nov 2020 08:51:54 -0800 (PST) Received: from mail-lj1-x229.google.com (mail-lj1-x229.google.com [IPv6:2a00:1450:4864:20::229]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 96B073A0AA7 for ; Tue, 10 Nov 2020 08:51:53 -0800 (PST) Received: by mail-lj1-x229.google.com with SMTP id p12so919770ljc.9 for ; Tue, 10 Nov 2020 08:51:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=kubw9uUIcmDPQIGGXQO8zT60YgUQ/lc2Z8VT+cNQQ9c=; b=k06/CnD6JdBE2MT7DhCQ/RsmIn2j/gyQzofPrqMUZMRdCTigpKeGdzcCmCikScIQCQ YIPUyuZWjTF9F00J++faqe1NX4nWO7JDrJIYydy9VanyWMsTDgx0lVQ5z5lZDIbjrIBn 4ItLGAoLc49AkoxggbdLd+MqOrQ2EIKShTbXyo1fOjNQ0lV33NVE2XJSHC0DWWawv8Nl axjtz92zjmhDhq5BsUSN8rHgZRXSmLcv9WdjR8MfrOM6yrUnE99u2YSO0uYAdEh6Rw76 fk6vPTiloM4Zjl+XaItPqoHj+OcCw9PsqNGIgh/OjGwNwNsIfnLHniCF+LdErMULd2MS feqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=kubw9uUIcmDPQIGGXQO8zT60YgUQ/lc2Z8VT+cNQQ9c=; b=WWYzECRwrDmNAVJg4GssUJ42WnXgFXpVj7tVCB7Lv7YglI6gWhDmrXk3JYLVLGDgan pT5JPPE1qGZvcNwZ9Zyd4X7C17q7crmhx7osdr5dKqXk3nImdT1oQpJ/a/nAzy365sEA jBbzbrO0abeyc2vGOyraFWhI47XNCK1PpyJeM0yNGX1sUtCqpLzWZLVPbJi/A82d8fI3 hAm7wMr7JdSaflnvVSjtbXz5VO/iVD7CucoP/fEluAYkjFb6mu5wug6/7LavMYzopSgh 2pqUNn7zCD+572m48mJKUDqbC1G3p2ZaDP8NC6qUknJ7HnHvrC9bhNhcUf2+CUzjYsKS y46g== X-Gm-Message-State: AOAM531yIUTU9qjjbpfY9fBWqkC3CKVPNR34QI5an80XiMCAhn1AiDMe OUl5J8Dlz7s9UVADA3D0OzLs1IxFkKt2a1xiDPM= X-Google-Smtp-Source: ABdhPJxuLFLJN+C9U/axTL/dZd2/fYzwnePHtIPghjKyBLLxboOtw/gwCPAz4BPxLbEJjuQU+k2P9ptoJt4L8sCAgqU= X-Received: by 2002:a2e:b70d:: with SMTP id j13mr1158843ljo.240.1605027111724; Tue, 10 Nov 2020 08:51:51 -0800 (PST) MIME-Version: 1.0 References: <2759a04d-949e-45ed-86db-bd499b7cff19@www.fastmail.com> In-Reply-To: <2759a04d-949e-45ed-86db-bd499b7cff19@www.fastmail.com> From: Bernard Aboba Date: Tue, 10 Nov 2020 08:51:42 -0800 Message-ID: To: Martin Thomson Cc: WebTransport Content-Type: multipart/alternative; boundary="000000000000d9855305b3c37e80" Archived-At: Subject: Re: [Webtransport] Http3Transport pooling/sharing X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Nov 2020 16:51:56 -0000 --000000000000d9855305b3c37e80 Content-Type: text/plain; charset="UTF-8" Martin said: "But then if you later learn that you need webtransport, what then?" [BA] Exactly. It doesn't seem right to me to require support for WebTransport (and associated functionality such as datagrams) on a connection that initially is only to be used for HTTP/3. It is also cumbersome to require that APIs be used in a certain order (e.g. always call the WebTransport constructor before fetch if you want to share the same connection). On Mon, Nov 9, 2020 at 7:18 PM Martin Thomson wrote: > There is a common problem with piecemeal negotiation. I can imagine > several responses to the case where you have an existing connection that > doesn't support the features you want. > > 1. Fail. > 2. Make a new connection. > 3. Synthesize datagram support (probably not worth it). > > Failing isn't completely unreasonable. If the connection doesn't have the > features you need, and you have no reason to believe that the negotiation > would be different next time, then this is a good reaction. Of course, you > need to be offering datagram support when you make the original connection, > even if you are not currently aware of the need for the feature. > > The quote you provide indicates doesn't seem at all problematic: both > features are negotiated at the same time, and one requires the other. This > is not particularly difficult to arrange. > > There is a more difficult problem to address: what if you have a > connection to a server that supports h2 and webtransport, but you get > Alt-Svc indicating support for h3. Do you upgrade? What if the upgraded > service doesn't support webtransport? If, at the time you upgrade, you > don't know, it seems reasonable to upgrade. But then if you later learn > that you need webtransport, what then? > > On Tue, Nov 10, 2020, at 05:32, Bernard Aboba wrote: > > One of the use cases that has been described in the recent W3C > > WebTransport WG meeting was sharing of an HTTP/3 QUIC connection > > between HTTP/3 Request/Response and WebTransport. > > > > In looking into how this would work in practice, it appears that there > > are some complications. > > > > Http3Transport requires support for HTTP/3 Datagrams. > > draft-vvv-webtransport-http3 Section 4.1 says: > > "If "http3_transport_support" is negotiated, support for the QUIC > > DATAGRAM extension MUST be negotiated." > > > > What happens if there is an existing HTTP/3 connection to the same > > Origin but that connection did not negotiate support for QUIC DATAGRAMS? > > -- > > Webtransport mailing list > > Webtransport@ietf.org > > https://www.ietf.org/mailman/listinfo/webtransport > > > > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --000000000000d9855305b3c37e80 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Martin said:=C2=A0

    &qu= ot;But then if you later learn that you need webtransport, what then?"=

    [BA] Exactly.=C2=A0

    It d= oesn't seem right to me to require support for WebTransport (and associ= ated functionality such as datagrams) on a connection that initially is onl= y to be used for HTTP/3.=C2=A0 It is also cumbersome to require that APIs b= e used in a certain order (e.g. always call the WebTransport constructor be= fore fetch if you want to share the same connection).=C2=A0=C2=A0

    On Mon, Nov 9, 2020 at 7:18 PM Martin Thomson <mt@lowentropy.net> wrote:
    There is a common problem with piecemeal n= egotiation.=C2=A0 I can imagine several responses to the case where you hav= e an existing connection that doesn't support the features you want.
    1. Fail.
    2. Make a new connection.
    3. Synthesize datagram support (probably not worth it).

    Failing isn't completely unreasonable.=C2=A0 If the connection doesn= 9;t have the features you need, and you have no reason to believe that the = negotiation would be different next time, then this is a good reaction.=C2= =A0 Of course, you need to be offering datagram support when you make the o= riginal connection, even if you are not currently aware of the need for the= feature.

    The quote you provide indicates doesn't seem at all problematic: both f= eatures are negotiated at the same time, and one requires the other.=C2=A0 = This is not particularly difficult to arrange.

    There is a more difficult problem to address: what if you have a connection= to a server that supports h2 and webtransport, but you get Alt-Svc indicat= ing support for h3.=C2=A0 Do you upgrade?=C2=A0 What if the upgraded servic= e doesn't support webtransport?=C2=A0 If, at the time you upgrade, you = don't know, it seems reasonable to upgrade.=C2=A0 But then if you later= learn that you need webtransport, what then?

    On Tue, Nov 10, 2020, at 05:32, Bernard Aboba wrote:
    > One of the use cases that has been described in the recent W3C
    > WebTransport WG meeting was sharing of an HTTP/3 QUIC connection
    > between HTTP/3 Request/Response and WebTransport.
    >
    > In looking into how this would work in practice, it appears that there=
    > are some complications.
    >
    > Http3Transport requires support for HTTP/3 Datagrams.
    > draft-vvv-webtransport-http3 Section 4.1 says:
    > "If "http3_transport_support" is negotiated, support fo= r the QUIC
    > DATAGRAM extension MUST be negotiated."
    >
    > What happens if there is an existing HTTP/3 connection to the same > Origin but that connection did not negotiate support for QUIC DATAGRAM= S?
    > --
    > Webtransport mailing list
    > Webtranspor= t@ietf.org
    > https://www.ietf.org/mailman/listinfo/webtran= sport
    >

    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000d9855305b3c37e80-- From nobody Tue Nov 10 15:33:26 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A51B33A11E5 for ; Tue, 10 Nov 2020 15:33:25 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kpKoKcs0E_i7 for ; Tue, 10 Nov 2020 15:33:23 -0800 (PST) Received: from mail-ot1-x331.google.com (mail-ot1-x331.google.com [IPv6:2607:f8b0:4864:20::331]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B650C3A11E3 for ; Tue, 10 Nov 2020 15:33:23 -0800 (PST) Received: by mail-ot1-x331.google.com with SMTP id k3so404948otp.12 for ; Tue, 10 Nov 2020 15:33:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=f4ecRj11vahTESr5RfdK/xLee+eDksIqHfH1aVMp8So=; b=VmTIUzpxp3/xU/MiZ3yDHPz8go5IN/0DXyckmZF1eWK1e5c7lyYwqQf0eNX3i97KSC pjJ0UaKvSblYIF7hK8IV5Bxd0UMwj165tBRLTZoMZPTYyUSdEprCpxpemLOkEF6xYsSE dufP+Nrq2sNA9ZiCP37igCmyEDUAYpNU8fb7+wtodpL3QQ/ReCsNN9MuFwyrgS3oZmcl 2bSki/ZVrnIlJg49me6NOKLsyNiDnHn7sawRd5TtlBEiV2sBTPrXHUxVHTtr0wvFDzvG NqndSfOVoEM3sSMxPQzaW8kqsQmiCJw6cWSRY7QgkQSm2v9YdoRyMq+BVXhiyxVKvitd gpig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=f4ecRj11vahTESr5RfdK/xLee+eDksIqHfH1aVMp8So=; b=HPlR/J6N57xKQexwglXNBMnK6oSLo66gD4CTFUNYwMPkbcb3Jx0jq/mhkdZHgHRBLg qH/UWXzJCoIbhZ6lEbuR7/z3DO+TSVInWCHVQshv7LUi9PdktkO5RKIk7IpTWsQD572O A3J9PxxLQKB5EObHNuXvC/voztcNGpJAy3YyR61VH3E7nJSfEXPh9Au3Y/1BStp5hj4r bz/JxHZ2fdGuNuyYgwc+BfZkDqE0NOPHg3JO7FqpNJaN0xocSxS1uMz+Xhhg8eOw/zFM nTpaSoSQ8r31xqS8u4BL5bxS4h2TU5FRcwYPByi6J3vRER83SpGeark6ipsHUONzxfzh LUlg== X-Gm-Message-State: AOAM5330OGmGSSUOpFJwCuM3png/+Fgb4SQMv4bZALB5WmTfaOtODBtx DNSnjHhgGCo1vjVvugKsr39RFbJGy6L8/a2E/C8= X-Google-Smtp-Source: ABdhPJxeEfzpTWfTAmZmjLlz5sPiuiQEx8WHHuTt3XZBQq3L7h8/Aac6VtWU89UgVpfA9EMUzPGQWw7aB+G1uxM5Rt0= X-Received: by 2002:a05:6830:22da:: with SMTP id q26mr16519769otc.127.1605051202979; Tue, 10 Nov 2020 15:33:22 -0800 (PST) MIME-Version: 1.0 References: <2759a04d-949e-45ed-86db-bd499b7cff19@www.fastmail.com> In-Reply-To: From: Luke Curley Date: Tue, 10 Nov 2020 15:33:13 -0800 Message-ID: To: Bernard Aboba Cc: Martin Thomson , WebTransport Content-Type: multipart/alternative; boundary="000000000000cccb5005b3c91a86" Archived-At: Subject: Re: [Webtransport] Http3Transport pooling/sharing X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Nov 2020 23:33:26 -0000 --000000000000cccb5005b3c91a86 Content-Type: text/plain; charset="UTF-8" Do all WebTransports need to have the same functionality? Would it make sense to have optional functionality? I see a problem trying to force all of the transports to behave the same in general. While it's possible to emulate datagrams over reliable streams, this subtly causes different behavior depending on the transport. Applications built on top of QuicTransport datagrams will assume UDP-like functionality. These assumptions are broken when using Http2Transport and potentially broken when using Http3Transport, depending on extension support. On Tue, Nov 10, 2020 at 8:51 AM Bernard Aboba wrote: > Martin said: > > "But then if you later learn that you need webtransport, what then?" > > [BA] Exactly. > > It doesn't seem right to me to require support for WebTransport (and > associated functionality such as datagrams) on a connection that initially > is only to be used for HTTP/3. It is also cumbersome to require that APIs > be used in a certain order (e.g. always call the WebTransport constructor > before fetch if you want to share the same connection). > > On Mon, Nov 9, 2020 at 7:18 PM Martin Thomson wrote: > >> There is a common problem with piecemeal negotiation. I can imagine >> several responses to the case where you have an existing connection that >> doesn't support the features you want. >> >> 1. Fail. >> 2. Make a new connection. >> 3. Synthesize datagram support (probably not worth it). >> >> Failing isn't completely unreasonable. If the connection doesn't have >> the features you need, and you have no reason to believe that the >> negotiation would be different next time, then this is a good reaction. Of >> course, you need to be offering datagram support when you make the original >> connection, even if you are not currently aware of the need for the feature. >> >> The quote you provide indicates doesn't seem at all problematic: both >> features are negotiated at the same time, and one requires the other. This >> is not particularly difficult to arrange. >> >> There is a more difficult problem to address: what if you have a >> connection to a server that supports h2 and webtransport, but you get >> Alt-Svc indicating support for h3. Do you upgrade? What if the upgraded >> service doesn't support webtransport? If, at the time you upgrade, you >> don't know, it seems reasonable to upgrade. But then if you later learn >> that you need webtransport, what then? >> >> On Tue, Nov 10, 2020, at 05:32, Bernard Aboba wrote: >> > One of the use cases that has been described in the recent W3C >> > WebTransport WG meeting was sharing of an HTTP/3 QUIC connection >> > between HTTP/3 Request/Response and WebTransport. >> > >> > In looking into how this would work in practice, it appears that there >> > are some complications. >> > >> > Http3Transport requires support for HTTP/3 Datagrams. >> > draft-vvv-webtransport-http3 Section 4.1 says: >> > "If "http3_transport_support" is negotiated, support for the QUIC >> > DATAGRAM extension MUST be negotiated." >> > >> > What happens if there is an existing HTTP/3 connection to the same >> > Origin but that connection did not negotiate support for QUIC DATAGRAMS? >> > -- >> > Webtransport mailing list >> > Webtransport@ietf.org >> > https://www.ietf.org/mailman/listinfo/webtransport >> > >> >> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --000000000000cccb5005b3c91a86 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Do all WebTransports need to have the same functionality? = Would it make sense to have optional functionality? I see a problem trying = to force all of the transports to behave the same in general.=C2=A0
    While it's possible to emulate datagrams over reliable stre= ams, this subtly=C2=A0causes different behavior depending on the transport.= Applications=C2=A0built on top of QuicTransport datagrams will assume UDP-= like functionality. These assumptions are broken when using Http2Transport = and potentially broken when using Http3Transport, depending on extension su= pport.

    On Tue, Nov 10, 2020 at 8:51 AM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    Martin said:=C2=A0

    "But then if you lat= er learn that you need webtransport, what then?"

    <= div>[BA] Exactly.=C2=A0

    It doesn't seem right = to me to require support for WebTransport (and associated functionality suc= h as datagrams) on a connection that initially is only to be used for HTTP/= 3.=C2=A0 It is also cumbersome to require that APIs be used in a certain or= der (e.g. always call the WebTransport constructor before fetch if you want= to share the same connection).=C2=A0=C2=A0

    On Mon, Nov 9, 2020 = at 7:18 PM Martin Thomson <mt@lowentropy.net> wrote:
    There is a common problem with piecemeal negot= iation.=C2=A0 I can imagine several responses to the case where you have an= existing connection that doesn't support the features you want.

    1. Fail.
    2. Make a new connection.
    3. Synthesize datagram support (probably not worth it).

    Failing isn't completely unreasonable.=C2=A0 If the connection doesn= 9;t have the features you need, and you have no reason to believe that the = negotiation would be different next time, then this is a good reaction.=C2= =A0 Of course, you need to be offering datagram support when you make the o= riginal connection, even if you are not currently aware of the need for the= feature.

    The quote you provide indicates doesn't seem at all problematic: both f= eatures are negotiated at the same time, and one requires the other.=C2=A0 = This is not particularly difficult to arrange.

    There is a more difficult problem to address: what if you have a connection= to a server that supports h2 and webtransport, but you get Alt-Svc indicat= ing support for h3.=C2=A0 Do you upgrade?=C2=A0 What if the upgraded servic= e doesn't support webtransport?=C2=A0 If, at the time you upgrade, you = don't know, it seems reasonable to upgrade.=C2=A0 But then if you later= learn that you need webtransport, what then?

    On Tue, Nov 10, 2020, at 05:32, Bernard Aboba wrote:
    > One of the use cases that has been described in the recent W3C
    > WebTransport WG meeting was sharing of an HTTP/3 QUIC connection
    > between HTTP/3 Request/Response and WebTransport.
    >
    > In looking into how this would work in practice, it appears that there=
    > are some complications.
    >
    > Http3Transport requires support for HTTP/3 Datagrams.
    > draft-vvv-webtransport-http3 Section 4.1 says:
    > "If "http3_transport_support" is negotiated, support fo= r the QUIC
    > DATAGRAM extension MUST be negotiated."
    >
    > What happens if there is an existing HTTP/3 connection to the same > Origin but that connection did not negotiate support for QUIC DATAGRAM= S?
    > --
    > Webtransport mailing list
    > Webtranspor= t@ietf.org
    > https://www.ietf.org/mailman/listinfo/webtran= sport
    >

    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000cccb5005b3c91a86-- From nobody Wed Nov 11 13:42:55 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C295B3A1142 for ; Wed, 11 Nov 2020 13:42:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NIlj_eTi7rLQ for ; Wed, 11 Nov 2020 13:42:52 -0800 (PST) Received: from mail-oo1-xc2e.google.com (mail-oo1-xc2e.google.com [IPv6:2607:f8b0:4864:20::c2e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 957CD3A1101 for ; Wed, 11 Nov 2020 13:42:52 -0800 (PST) Received: by mail-oo1-xc2e.google.com with SMTP id y3so802381ooq.2 for ; Wed, 11 Nov 2020 13:42:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=BcqFIAxiFBYsv/eDTV7253oNtGCYAZ+xcxo1Wd4ag2o=; b=FcqPiqtRChxu4hVC4Mfua4/S1032d73EAroiCjnthoTGVlDnI5sFVOiLGiXMfYpWQn 62g4BD/CPdJ7hTFu+4/p7G1UMAncJucAyxXA3bYh3nHvlpFQXJ+FTmcTBZcqEY1CMO9I c5gW47GAG8gw2bTb2uP27WEwkg4Lv0S3sS7yBOhUfv4rWWnmrQLMoCtedmk4i8sSLudg kN/6zFeNOTBT+9Psl0IwwkhZ2rWTcagpaAL1lMy94EZdwsTj4hymqUZFa5vfMuwNjBAP 0DHDcpZ4AmWya1Br/Vs3xmXTQ9eInEI1KOfqe3cMG2pPFJFREBY5d8ccrwl7NyEwVLyi osDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=BcqFIAxiFBYsv/eDTV7253oNtGCYAZ+xcxo1Wd4ag2o=; b=rv7zGc9sBXaJnMP+d9qF9DQU4m4c55x52K8UW2fxPHbChG7H0cXC9fLZf/wjn3QHeS ay5EZzqj1NuVfcnx41swfx1TjJwugSknPVxIE3kfp2MukYLFfi1Y7tc/eVY5CPFvLqCk tpq0/N+wSvyyhflPZuvOAMgDVahBI5LVpQa9iwT1mXSM4jlN4oXvAfOnsfBQt+Voa95/ JzJ058y6hZbKMEw5p1LkmR1RmRRFDQR0nzCtJ2FtPLwt7+MscvDz717WJqAkspMiaJpM yZsPGSt92GbcP/8HOZSPiLPVgcxy4jCTa4vSXQVxpvih/442M3f6HVprdcjkRji2H6vO fkbw== X-Gm-Message-State: AOAM531Gx05BnBcmWVfKAO/T+X0mrZ3qPVQw1EAViEd1O2IdEFE69qMp YHJ31buG66foqGsukFzW53mVTZNb1+7ol24LHHr0iX94igSKsg== X-Google-Smtp-Source: ABdhPJxsgTkwrBYUby8f0pyTWFXsIA2pNOjIcY7ZxrSLsBolRyGCARrsIQlVf6d1EU6hkX33hmy/3Iq9K2eSl2Ku2xs= X-Received: by 2002:a4a:9607:: with SMTP id q7mr18658022ooi.79.1605130971484; Wed, 11 Nov 2020 13:42:51 -0800 (PST) MIME-Version: 1.0 From: Luke Curley Date: Wed, 11 Nov 2020 13:42:43 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="0000000000005f96ad05b3dbadad" Archived-At: Subject: [Webtransport] HTTP/3 Downgrade X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Nov 2020 21:42:54 -0000 --0000000000005f96ad05b3dbadad Content-Type: text/plain; charset="UTF-8" It seems like connection pooling introduces a lot of technical complexity for limited benefits. Hypothetically, what if connection pooling was dropped as a requirement? What if Http3Transport involved establishing a new HTTP/3 connection and downgrading it to QUIC? It would be analogous to WebSockets for HTTP/1.1. You could use 0-RTT to minimize latency when establishing a HTTP/3 or Http3Transport connection to an existing host. These connections would not share congestion control state (unfortunate), but would also not share flow control limits (yay). I also think this is how you could merge QuicTransport and Http3Transport. Use HTTP/3 for the handshake, and QUIC for the data transfer. --0000000000005f96ad05b3dbadad Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    It seems like connection pooling introduces a lo= t of technical complexity for limited benefits. Hypothetically, what if con= nection pooling was dropped as a requirement?=C2=A0

    What if Http3Transport involved establishing a new HTTP/3 connectio= n and downgrading it to QUIC? It would be analogous to WebSockets for HTTP/= 1.1.=C2=A0=C2=A0

    You could use 0-RTT to m= inimize latency when establishing a HTTP/3 or Http3Transport connection to = an existing host. These connections would not share congestion control stat= e (unfortunate), but would also not share flow control limits (yay).
    <= /div>

    I also think this is how you could merg= e QuicTransport and Http3Transport. Use HTTP/3 for the handshake, and QUIC = for the data transfer.
    --0000000000005f96ad05b3dbadad-- From nobody Wed Nov 11 13:48:41 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5AECA3A115E for ; Wed, 11 Nov 2020 13:48:40 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -17.599 X-Spam-Level: X-Spam-Status: No, score=-17.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NUO8pih4ReMr for ; Wed, 11 Nov 2020 13:48:38 -0800 (PST) Received: from mail-yb1-xb2a.google.com (mail-yb1-xb2a.google.com [IPv6:2607:f8b0:4864:20::b2a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 904023A115C for ; Wed, 11 Nov 2020 13:48:38 -0800 (PST) Received: by mail-yb1-xb2a.google.com with SMTP id k65so3314132ybk.5 for ; Wed, 11 Nov 2020 13:48:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=y3la6wnAFGXoYRNjdy3aoT/p8TfXxA34AVZwimvC2JA=; b=RP4Ln2nLsvhPJt+Hjyt6tU+AAIlodRUcHPSycJT9KHXQq3NKt0WIbdWF4TR8HLWCyk Wf4Gys4H8MGR7QA0dFlENrYdhHWcoOHjtjGOZJikVvjxjU9Db+YY44dTfACkYF6oY0Kq FYquxdBgFO4Q/ktEutuuEVfeAATx6xDFnh0Juw4cvi527+uHEBH4P2zdmT/sJN2pTIxd OgIU73tVfXXuaLS6p/69yLu2kq+yKBag1+eSVpcGD/W+IQwr8TM5ZZjgO4C5JVX4JeEy eBL5KQ7/uusjCzoM6dTZpawPzevsYhsbl8bf/AISNtqyTH26LZ35hA4EQNPPL7pB0Unc XNLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=y3la6wnAFGXoYRNjdy3aoT/p8TfXxA34AVZwimvC2JA=; b=Nr77Ck+7cOOOHLJhiAi/kRkP+wBTZ9i9+XIwl6xUU9p+66y1iJ9E9nXbXgoGSYsc0m vJtpXVH43xodOk2JvoI+vTFJdUT4+ZlOXiUZeZV5wEUxA7vDH/eOylfA6HIDQK9TigsC 1aGTYfqCQsLII/nZGH2Q+XxMArxpNBOE/BbSUFBLGOFIjlKrKy8ZqqHIClXCrXZmh8Vq siFcgKzIOeOfqo79GCu9Bdjgf5HKfv1oPL/fYDWd6rHPHKQgclOM/rG2LQsLfCcMqvxU VlIpwXfFqdqVdHJMCuzszzUORtkggCY/e5GDEd2XxU93/92PlRP/lJaT59JIxg7XR3DT GBkg== X-Gm-Message-State: AOAM532GyD7NN5vaCC01yY0+Zc8obfonp4keXqPSPNdz46T1fpQq0pH3 D+mVNTZsdipzOc2vsU+NoM88ZsxrIHTLRvoNMQQYdA== X-Google-Smtp-Source: ABdhPJzvK5gJookWF5o8hMRjfP5tvoLAUuhFF0ZZ4aZnQ0F0mzWxtlDc1D7YqaE8di2Iwblan3DyrWuxU2eT6gZdp7c= X-Received: by 2002:a25:2d55:: with SMTP id s21mr5114880ybe.389.1605131317540; Wed, 11 Nov 2020 13:48:37 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Ian Swett Date: Wed, 11 Nov 2020 16:48:26 -0500 Message-ID: To: Luke Curley Cc: WebTransport Content-Type: multipart/alternative; boundary="00000000000000a78105b3dbc21d" Archived-At: Subject: Re: [Webtransport] HTTP/3 Downgrade X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Nov 2020 21:48:40 -0000 --00000000000000a78105b3dbc21d Content-Type: text/plain; charset="UTF-8" Downgrading post handshake is very complex in practice, particularly because QUIC is not head-of-line blocking. If you were to pursue this, I would recommend downgrading as part of the handshake. You could use a transport param instead of alpn if that was preferable. On Wed, Nov 11, 2020 at 4:43 PM Luke Curley wrote: > It seems like connection pooling introduces a lot of technical complexity > for limited benefits. Hypothetically, what if connection pooling was > dropped as a requirement? > > What if Http3Transport involved establishing a new HTTP/3 connection and > downgrading it to QUIC? It would be analogous to WebSockets for HTTP/1.1. > > You could use 0-RTT to minimize latency when establishing a HTTP/3 or > Http3Transport connection to an existing host. These connections would not > share congestion control state (unfortunate), but would also not share flow > control limits (yay). > > I also think this is how you could merge QuicTransport and Http3Transport. > Use HTTP/3 for the handshake, and QUIC for the data transfer. > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --00000000000000a78105b3dbc21d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Downgrading post handshake is very complex in practic= e,=C2=A0particularly because QUIC is not head-of-line blocking. If you were= to pursue=C2=A0this, I would recommend=C2=A0downgrading as part of the han= dshake.

    You could use a transport param instead of alpn= if that was preferable.=C2=A0

    On Wed, Nov 11, 2020 at 4:43 PM Luke Curley &= lt;kixelated@gmail.com> wrote= :
    It seems like connection pooling introduces a lot of technical= complexity for limited benefits. Hypothetically, what if connection poolin= g was dropped as a requirement?=C2=A0

    What i= f Http3Transport involved establishing a new HTTP/3 connection and downgrad= ing it to QUIC? It would be analogous to WebSockets for HTTP/1.1.=C2=A0=C2= =A0

    You could use 0-RTT to minimize laten= cy when establishing a HTTP/3 or Http3Transport connection to an existing h= ost. These connections would not share congestion control state (unfortunat= e), but would also not share flow control limits (yay).

    I also think this is how you could merge QuicTranspo= rt and Http3Transport. Use HTTP/3 for the handshake, and QUIC for the data = transfer.
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --00000000000000a78105b3dbc21d-- From nobody Wed Nov 11 13:52:06 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D3EF93A1167 for ; Wed, 11 Nov 2020 13:52:04 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -17.599 X-Spam-Level: X-Spam-Status: No, score=-17.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5cGlvd9tfueq for ; Wed, 11 Nov 2020 13:52:03 -0800 (PST) Received: from mail-lf1-x12b.google.com (mail-lf1-x12b.google.com [IPv6:2a00:1450:4864:20::12b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 323703A116B for ; Wed, 11 Nov 2020 13:52:03 -0800 (PST) Received: by mail-lf1-x12b.google.com with SMTP id j205so5313999lfj.6 for ; Wed, 11 Nov 2020 13:52:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=yMWqaG/o1uPACYUJMj4/O12X9hjmq1z3vqEhzdZ4uMg=; b=XcFZ1nbhlaJukOrL7nUNcNAEdgHQa7AGF8evB+SH/7fKp4qFYG3ZV0o4b+a8vM84AA Cz/TGgoEgDFKfvzHsNRR9TIdhKEbHWfEb5kP24i87MwMTXdfht3/8HuCUz5Py0DuoPAL cQLBZCRyzMbe/KhVZew1tp7nyvYn440HYWXK6H2zI0qDJ9KCKW4nrhB7eIcLkW/uk8Sp aSMpIxX9CpU5oqAGulSD1nnSBsP1kf/FLsk5su1kFmHbNrZW2JWzNSHu+ZAkbtOoY9wF EYLI/Szw26p9DkUA0CsO9873eJx+WuWxLbw+eG9BJoSHNTfeCc4XwctbSkS/hysd1GLf 1tYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=yMWqaG/o1uPACYUJMj4/O12X9hjmq1z3vqEhzdZ4uMg=; b=GEdgL2nYBIHyJ5ZnPsAVl7IAx4ZyBIUL4C7UGgdmJ4HmA8MuPr3K9bBrOZwcmwg5JE uoGNrOPSiTbwjaPEMiwHRVZlIWiFk6X1gczCd3ZxIkLV6HFj3LEQqHpqJ5y4W1fWgQG+ 2kSCMpWAEOogTmfakJsy1g9QaRYdq/vajFZ3irkRraiEeW9gHYvgy535csYtwyY2FR12 PiofwqhDzpSdweRN01pN7PD7y9cl/tQZ2BK0tTh/Xg5mBAI1oytEIWfeYfRXym4M3rjw AzhtfDj6BsM4tJtHkSZr0t0wu8ZERJO8GzAIXh3NKKbVJXPBrawsAuH8LaeGv5CwCY8V y2iw== X-Gm-Message-State: AOAM531FO1jNmH5AyuRLWWXCuX/34VZjbTVD+UpXqSg2wByKH0r1vSuI ZUaSALcNxp3Kz0IkUvTHiJBfI03maFlb2ALSdF/dpw== X-Google-Smtp-Source: ABdhPJxul4VsRtaIH7GjqAQvOQjuKoUzPHywdOSpNyiJHMXFKHlrBMEB6iOK3aztALPrkrcRj9YFYAHw6c21lMUPvlY= X-Received: by 2002:a19:c005:: with SMTP id q5mr8051193lff.400.1605131520979; Wed, 11 Nov 2020 13:52:00 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Victor Vasiliev Date: Wed, 11 Nov 2020 16:51:49 -0500 Message-ID: To: Luke Curley Cc: WebTransport Content-Type: multipart/alternative; boundary="00000000000020a77905b3dbce26" Archived-At: Subject: Re: [Webtransport] HTTP/3 Downgrade X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Nov 2020 21:52:05 -0000 --00000000000020a77905b3dbce26 Content-Type: text/plain; charset="UTF-8" I'm not sure "HTTP/3 without pooling" does anything that QuicTransport doesn't already do, especially since the latter got real header support. So, at least as far as my understanding of this space goes, Http3Transport without pooling doesn't make that much sense. On Wed, Nov 11, 2020 at 4:43 PM Luke Curley wrote: > It seems like connection pooling introduces a lot of technical complexity > for limited benefits. Hypothetically, what if connection pooling was > dropped as a requirement? > > What if Http3Transport involved establishing a new HTTP/3 connection and > downgrading it to QUIC? It would be analogous to WebSockets for HTTP/1.1. > > You could use 0-RTT to minimize latency when establishing a HTTP/3 or > Http3Transport connection to an existing host. These connections would not > share congestion control state (unfortunate), but would also not share flow > control limits (yay). > > I also think this is how you could merge QuicTransport and Http3Transport. > Use HTTP/3 for the handshake, and QUIC for the data transfer. > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --00000000000020a77905b3dbce26 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    I'm not sure "HTTP/3 without pooling" does a= nything that QuicTransport doesn't already=C2=A0do, especially since th= e latter got real header support.=C2=A0 So, at least as far as my understan= ding of this space goes, Http3Transport without pooling doesn't make th= at much sense.

    On Wed, Nov 11, 2020 at 4:43 PM Luke Curley <kixelated@gmail.com> wrote:
    I= t seems like connection pooling introduces a lot of technical complexity fo= r limited benefits. Hypothetically, what if connection pooling was dropped = as a requirement?=C2=A0

    What if Http3Transpo= rt involved establishing a new HTTP/3 connection and downgrading it to QUIC= ? It would be analogous to WebSockets for HTTP/1.1.=C2=A0=C2=A0

    You could use 0-RTT to minimize latency when establi= shing a HTTP/3 or Http3Transport connection to an existing host. These conn= ections would not share congestion control state (unfortunate), but would a= lso not share flow control limits (yay).

    I also think this is how you could merge QuicTransport and Http3Tra= nsport. Use HTTP/3 for the handshake, and QUIC for the data transfer.
    =
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --00000000000020a77905b3dbce26-- From nobody Wed Nov 11 14:35:43 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8CC3C3A11A2 for ; Wed, 11 Nov 2020 14:35:41 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DC_PNG_UNO_LARGO=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vf7h-VV4e_es for ; Wed, 11 Nov 2020 14:35:39 -0800 (PST) Received: from mail-lf1-x130.google.com (mail-lf1-x130.google.com [IPv6:2a00:1450:4864:20::130]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C47023A119B for ; Wed, 11 Nov 2020 14:35:38 -0800 (PST) Received: by mail-lf1-x130.google.com with SMTP id z21so5421638lfe.12 for ; Wed, 11 Nov 2020 14:35:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=MrTB0ob3dM6sCR+R3SK2Vl13jkhGtGU2bIt3zsXW6qo=; b=Temp+CDkbdR/3G57RRh23s/ZPdC6z5wv16AP02KskUvu96evvFiI54mC4FXR6hV6ZK 4y9/2+VrbNhIjKthZykGK6hUY8Ho+MtAKAJ885E6nOYpW9AtO8jMgKjL5Fl2n/9Z0RPm r+Z/BCFlOcYcPZdNQO0WykJhJLqpN9KvcrY9hDOlMlu3D9+KYZL7rGm5p3o9q8j+Ls/e N5xRxzTF5vA4wGUsJYcduonKnub2M0+XZKz4hLgNuAiFpjYcqIZJZyKh396epKWGzwPn Z1FcKMZw34ZsqpGXvvsOaJK7KALvi5zLb3ihBPEwIy5H+3oGDM55PItDL3t8OaygXztZ DFFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=MrTB0ob3dM6sCR+R3SK2Vl13jkhGtGU2bIt3zsXW6qo=; b=MvlqTysEKK0Th7S2qzbX5plr7xEuWZrf89OG+wcP2qxcn+S/Q65ehThyt9ScHwKw0F KaUPG9yCZWNEgdBN3SiKUGticzAmb/ER2WICVV9/AMnpX6nAB2YddsXFmwYP9MLSuMAw PlKINeiD7l+g5orL+XpQpc+obezK5geit0a1eqAFh7eInB28xcpxjJXEIb8W2xLXrVeo 5RKIMqvzj4MzSxVXA+4GbtiElO8p0la96E4pAWDQugoPto6jlnwJ43BcObxF+k2eq8Xp 9u/8HoTseIBJIObdnwAOiqNsaiG78tj6cfaNM3voAYdGqmO6iSzGQkLsrBcHwlQq+Q2o ueWg== X-Gm-Message-State: AOAM5325xKkwlD6pgvPvPgYJuBIcJYv1fn2esyS/8nB/ZGsF6Ida2fAo 28TzaaWjUnjvuDDzAdZi4Vo2AxQ+ZgXuZSbx+/I= X-Google-Smtp-Source: ABdhPJwReEzJhEvuQMHrwGQlReZjAYIJ2KDHpRpVcUyOxMGIOLRuKqyKuTlRW/atkJEkMvOYMQnAMbEUXVn24O2XTuk= X-Received: by 2002:a19:88c:: with SMTP id 134mr9716822lfi.560.1605134136375; Wed, 11 Nov 2020 14:35:36 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Bernard Aboba Date: Wed, 11 Nov 2020 14:35:25 -0800 Message-ID: To: Victor Vasiliev Cc: Luke Curley , WebTransport Content-Type: multipart/related; boundary="00000000000004417f05b3dc6ae3" Archived-At: Subject: Re: [Webtransport] HTTP/3 Downgrade X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 11 Nov 2020 22:35:42 -0000 --00000000000004417f05b3dc6ae3 Content-Type: multipart/alternative; boundary="00000000000004417c05b3dc6ae2" --00000000000004417c05b3dc6ae2 Content-Type: text/plain; charset="UTF-8" Victor said: "Http3Transport without pooling doesn't make that much sense." [BA] Some Http3Transport use cases depend on pooling between WebTransport and HTTP/3 request/responses; others could just be satisfied by WebTransport pooling. I would suggest that we distinguish these two requirements, because pooling/sharing a QUIC connection between WebTransport instances appears simpler than pooling/sharing a QUIC connection between WebTransport and HTTP/3. At IETF 107 RIPT BOF there was a desire expressed to enable media services to leverage HTTP infrastructure. Justin Uberti described a use case where gRPC would be sent over HTTP/3 to request that the server initiate either a reliable stream or flow of datagrams (see below). This use case appears to require pooling of WebTransport and HTTP/3 request/responses (in order to simplify firewall traversal). However, this use case is not easily supported using an garden variety HTTP/3 server, which probably could not initially be expected to support QUIC datagrams (although it would not be hard to support in node.js assuming that a QUIC module was available). See Slide 7 here: https://datatracker.ietf.org/meeting/107/materials/slides-107-ript-rtc-implementation-experiences-00 [image: image.png] On Wed, Nov 11, 2020 at 1:52 PM Victor Vasiliev wrote: > I'm not sure "HTTP/3 without pooling" does anything that QuicTransport > doesn't already do, especially since the latter got real header support. > So, at least as far as my understanding of this space goes, Http3Transport > without pooling doesn't make that much sense. > > On Wed, Nov 11, 2020 at 4:43 PM Luke Curley wrote: > >> It seems like connection pooling introduces a lot of technical complexity >> for limited benefits. Hypothetically, what if connection pooling was >> dropped as a requirement? >> >> What if Http3Transport involved establishing a new HTTP/3 connection and >> downgrading it to QUIC? It would be analogous to WebSockets for HTTP/1.1. >> >> You could use 0-RTT to minimize latency when establishing a HTTP/3 or >> Http3Transport connection to an existing host. These connections would not >> share congestion control state (unfortunate), but would also not share flow >> control limits (yay). >> >> I also think this is how you could merge QuicTransport and >> Http3Transport. Use HTTP/3 for the handshake, and QUIC for the data >> transfer. >> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --00000000000004417c05b3dc6ae2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Victor said:=C2=A0

    "Http3Transport= without pooling doesn't make that much sense."

    [BA] Some Http3Transport use cases depend on pooling between WebTran= sport and HTTP/3 request/responses; others could just be satisfied by WebTr= ansport pooling.=C2=A0 I would suggest that we distinguish these two requir= ements, because pooling/sharing a QUIC connection between WebTransport inst= ances appears simpler than pooling/sharing a QUIC connection between WebTra= nsport and HTTP/3.

    At IETF 107 RIPT BOF there was = a desire expressed to enable media services to leverage HTTP infrastructure= . Justin Uberti described a use case where gRPC would be sent over HTTP/3 t= o request that the server initiate either a reliable stream or flow of data= grams (see below).=C2=A0 This use case appears to require pooling of WebTra= nsport and HTTP/3 request/responses (in order to simplify firewall traversa= l).=C2=A0 However, this use case is not easily supported using an garden=C2= =A0variety HTTP/3 server, which probably could not initially be expected to= support QUIC datagrams (although it would not be hard to support in node.j= s assuming that a QUIC module was available).=C2=A0

    See Slide 7 here:=C2=A0https://data= tracker.ietf.org/meeting/107/materials/slides-107-ript-rtc-implementation-e= xperiences-00

    3D"image.png"
    On Wed, N= ov 11, 2020 at 1:52 PM Victor Vasiliev <vasilvv=3D40google.com@dmarc.ietf.org> wrote:
    I'= m not sure "HTTP/3 without pooling" does anything that QuicTransp= ort doesn't already=C2=A0do, especially since the latter got real heade= r support.=C2=A0 So, at least as far as my understanding of this space goes= , Http3Transport without pooling doesn't make that much sense.
    On Wed, N= ov 11, 2020 at 4:43 PM Luke Curley <kixelated@gmail.com> wrote:
    It seems= like connection pooling introduces a lot of technical complexity for limit= ed benefits. Hypothetically, what if connection pooling was dropped as a re= quirement?=C2=A0

    What if Http3Transport invo= lved establishing a new HTTP/3 connection and downgrading it to QUIC? It wo= uld be analogous to WebSockets for HTTP/1.1.=C2=A0=C2=A0

    =
    You could use 0-RTT to minimize latency when establishing a= HTTP/3 or Http3Transport connection to an existing host. These connections= would not share congestion control state (unfortunate), but would also not= share flow control limits (yay).

    I also think this is how you could merge QuicTransport and Http3Transport.= Use HTTP/3 for the handshake, and QUIC for the data transfer.
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--0000000000002093b905b3dee07f Content-Type: text/plain; charset="UTF-8" @bernard I think that use-case boils down to a lack of HTTP functionality. The "proper" approach would be to use HTTP server push for media, but nobody likes that. Justin's ask is to instead to augment HTTP/3 such that it muxes in QUIC-like connections. I do think it address HTTP's short-comings, but it's non-trivial and will require custom HTTP/3 implementations. My use-case is almost identical (Twitch). We're implementing a video protocol over QuicTransport instead of trying to leverage HTTP/3. It gives us the ability to push media while utilizing stock QUIC implementations. All you need on top is a simple API layer, such as JSON messages over bidirectional streams. As for firewall traversal, QUIC connections can use the same socket and would thus share the NAT binding... assuming middleware does not decode QUIC initial packets. Each connection could end up on different host depending on load balancing though. Has somebody formulated a list of pros and cons for Http3Transport as compared to QuicTransport? On Wed, Nov 11, 2020 at 2:35 PM Bernard Aboba wrote: > Victor said: > > "Http3Transport without pooling doesn't make that much sense." > > [BA] Some Http3Transport use cases depend on pooling between WebTransport > and HTTP/3 request/responses; others could just be satisfied by > WebTransport pooling. I would suggest that we distinguish these two > requirements, because pooling/sharing a QUIC connection between > WebTransport instances appears simpler than pooling/sharing a QUIC > connection between WebTransport and HTTP/3. > > At IETF 107 RIPT BOF there was a desire expressed to enable media services > to leverage HTTP infrastructure. Justin Uberti described a use case where > gRPC would be sent over HTTP/3 to request that the server initiate either a > reliable stream or flow of datagrams (see below). This use case appears to > require pooling of WebTransport and HTTP/3 request/responses (in order to > simplify firewall traversal). However, this use case is not easily > supported using an garden variety HTTP/3 server, which probably could not > initially be expected to support QUIC datagrams (although it would not be > hard to support in node.js assuming that a QUIC module was available). > > See Slide 7 here: > https://datatracker.ietf.org/meeting/107/materials/slides-107-ript-rtc-implementation-experiences-00 > > [image: image.png] > > On Wed, Nov 11, 2020 at 1:52 PM Victor Vasiliev 40google.com@dmarc.ietf.org> wrote: > >> I'm not sure "HTTP/3 without pooling" does anything that QuicTransport >> doesn't already do, especially since the latter got real header support. >> So, at least as far as my understanding of this space goes, Http3Transport >> without pooling doesn't make that much sense. >> >> On Wed, Nov 11, 2020 at 4:43 PM Luke Curley wrote: >> >>> It seems like connection pooling introduces a lot of technical >>> complexity for limited benefits. Hypothetically, what if connection pooling >>> was dropped as a requirement? >>> >>> What if Http3Transport involved establishing a new HTTP/3 connection and >>> downgrading it to QUIC? It would be analogous to WebSockets for HTTP/1.1. >>> >>> You could use 0-RTT to minimize latency when establishing a HTTP/3 or >>> Http3Transport connection to an existing host. These connections would not >>> share congestion control state (unfortunate), but would also not share flow >>> control limits (yay). >>> >>> I also think this is how you could merge QuicTransport and >>> Http3Transport. Use HTTP/3 for the handshake, and QUIC for the data >>> transfer. >>> -- >>> Webtransport mailing list >>> Webtransport@ietf.org >>> https://www.ietf.org/mailman/listinfo/webtransport >>> >> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > --0000000000002093b905b3dee07f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    @bernard I think that use-case boils down to a lack o= f HTTP functionality. The "proper" approach would be to use HTTP = server push for media, but nobody likes that. Justin's ask is to instea= d to augment HTTP/3 such that it muxes in QUIC-like connections. I do think= it address HTTP's short-comings, but it's non-trivial and will req= uire custom HTTP/3 implementations.=C2=A0

    My use-c= ase is almost identical (Twitch). We're implementing a video protocol o= ver QuicTransport instead of trying to leverage HTTP/3. It gives us the abi= lity to push media while utilizing stock QUIC implementations. All you need= on top is a simple API layer, such as JSON messages=C2=A0over bidirectiona= l streams.

    As for firewall traversal, QUIC connect= ions can use the same socket and would thus share the NAT binding... assumi= ng middleware does not decode QUIC initial packets. Each connection could e= nd up on different host depending on load balancing though.
    <= br>
    Has somebody formulated a list of pros and cons for Http3Tran= sport as compared to QuicTransport?

    On Wed, Nov 11, 2020 at 2:35 PM Be= rnard Aboba <bernard.aboba@gm= ail.com> wrote:
    Victor said:=C2=A0

    "Http3Tr= ansport without pooling doesn't make that much sense."
    <= br>
    [BA] Some Http3Transport use cases depend on pooling between = WebTransport and HTTP/3 request/responses; others could just be satisfied b= y WebTransport pooling.=C2=A0 I would suggest that we distinguish these two= requirements, because pooling/sharing a QUIC connection between WebTranspo= rt instances appears simpler than pooling/sharing a QUIC connection between= WebTransport and HTTP/3.

    At IETF 107 RIPT BOF the= re was a desire expressed to enable media services to leverage HTTP infrast= ructure. Justin Uberti described a use case where gRPC would be sent over H= TTP/3 to request that the server initiate either a reliable stream or flow = of datagrams (see below).=C2=A0 This use case appears to require pooling of= WebTransport and HTTP/3 request/responses (in order to simplify firewall t= raversal).=C2=A0 However, this use case is not easily supported using an ga= rden=C2=A0variety HTTP/3 server, which probably could not initially be expe= cted to support QUIC datagrams (although it would not be hard to support in= node.js assuming that a QUIC module was available).=C2=A0

    On Wed, Nov 11, 2020 at 1:52 PM Victor Vasiliev <vasilvv= =3D40googl= e.com@dmarc.ietf.org> wrote:
    I'm not sure "HTTP/3 without = pooling" does anything that QuicTransport doesn't already=C2=A0do,= especially since the latter got real header support.=C2=A0 So, at least as= far as my understanding of this space goes, Http3Transport without pooling= doesn't make that much sense.

    On Wed, Nov 11, 2020 at 4:43 PM Luke Curl= ey <kixelated@g= mail.com> wrote:
    It seems like connection pooling introdu= ces a lot of technical complexity for limited benefits. Hypothetically, wha= t if connection pooling was dropped as a requirement?=C2=A0

    What if Http3Transport involved establishing a new HTTP/3 c= onnection and downgrading it to QUIC? It would be analogous to WebSockets f= or HTTP/1.1.=C2=A0=C2=A0

    You could use 0-= RTT to minimize latency when establishing a HTTP/3 or Http3Transport connec= tion to an existing host. These connections would not share congestion cont= rol state (unfortunate), but would also not share flow control limits (yay)= .

    I also think this is how you co= uld merge QuicTransport and Http3Transport. Use HTTP/3 for the handshake, a= nd QUIC for the data transfer.
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charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Nov 10, 2020 at 8:38 AM Bernard Aboba wrote: > Martin said: > > "It seems your arguments are based on it being possible to hide a bunch o= f > this complexity under a unified API. That's great, but it doesn't mean > that the abstraction won't leak. I'm sure that running over h2 will look > very different to running on bare QUIC." > > [BA] There is a question whether h2 is supported within the WebTransport > API: > https://github.com/w3c/webtransport/issues/164 > > Part of the concern is the complexity that would be added by supporting > failover within the API, rather than outside of it. > > Currently, if QUIC and associated functionality (such as datagram support= ) > cannot be negotiated, the WebTransport constructor will fail. Among othe= r > things this implies that if the WebTransport constructor succeeds and the > ready promise is resolved, that the datagramWritable and datagramReadable > attributes are always defined. > > It does not make sense to me to pretend that datagram functionality is > available when running over a transport that does not support datagrams. > I don't agree with this. The availability or non-availability of UDP is unpredictable to users and context-dependent, and the user experience of having things just not in one network is extremely frustrating. Moreover, we have extensive experience that it is possible to provide inferior, yet somewhat acceptable, low-latency applications such as videoconferencing even over non-datagram transport (hence the support for ICE TCP and TURN TCP etc in WebRTC), especially in fast networks. I believe the same reasoning applies here. -Ekr > > On Mon, Nov 9, 2020 at 9:05 PM Martin Thomson wrote: > >> Hey Victor, >> >> I have a hard time understanding this. >> >> If I recall correctly, your original proposal involved multiple >> protocols. So this sounds like you have discovered something that suppo= rts >> that view, or at least has consolidated your own opinion. But I don't s= ee >> any actual evidence here to support building multiple protocols. >> >> Building one protocol is hard enough. It seems like we signed on to do >> two here, on the basis that we need a fallback. But I don't see how tha= t >> naturally extends to three. On the contrary, just one protocol is prett= y >> tempting at this point. TCP fallback could be handled by a websockets >> polyfill outside of the browser (or a WebRTC polyfill for those who are >> less complexity-averse). >> >> It seems your arguments are based on it being possible to hide a bunch o= f >> this complexity under a unified API. That's great, but it doesn't mean >> that the abstraction won't leak. I'm sure that running over h2 will loo= k >> very different to running on bare QUIC. >> >> That doesn't meant that I'm not curious about your semantic unification >> idea. I don't understand that either, but it's an abstract notion with >> some appeal to me. >> >> Cheers, >> Martin >> >> On Wed, Oct 28, 2020, at 03:22, Victor Vasiliev wrote: >> > (previous iteration of this thread here >> > < >> https://mailarchive.ietf.org/arch/msg/webtransport/CEGNLkMqrvug3uPyPmQIX= nWVIAY/ >> >) >> > >> > Hello everyone, >> > >> > As you might remember, we've still not decided which of QuicTransport, >> > Http2Transport and Http3Transport we should adapt: >> > 1. There has been a strong interest in running WebTransport over HTTP= . >> > HTTP allows us to do connection pooling, a well-understood mechanism o= f >> > falling back to TCP and better integration with existing load balancer= s. >> > 2. There has also been interest in running WebTransport over QUIC >> > itself, due to the complexity of WebTransport over HTTP, both in terms >> > of design and in terms of writing servers for it (nice discussion here >> > < >> https://mailarchive.ietf.org/arch/msg/webtransport/O8P5nmmw0ywra1VWtJmS4= lBglhI/ >> >). >> > 3. There has been a desire to pick only one of those. >> > I've been reworking >> > the QuicTransport draft based on what we've found while implementing i= t >> > in Chrome. Doing that, and observing how it becomes more and more lik= e >> > HTTP with every revision, has convinced me more than ever that all of >> > the transports above should be the same thing conceptually, differing >> > only in wire protocol. That observation was very helpful, since it >> > allowed us to replace >> > all of the different API entry points with just one, already >> > dramatically simplifying the situation. Same observation also can >> > potentially help us make some progress here. We can unify all of the >> > proposals semantically (make them share a URL scheme and the headers >> > format), and then the variants just become different encodings. >> > >> > If we compare the WebTransport proposals to the HTTP ecosystem, beside= s >> > the obvious equivalences (webtransport-http2 =E2=89=85 HTTP/2, >> > webtransport-http3 =E2=89=85 HTTP/3), it becomes apparent that >> > webtransport-quic =E2=89=85 HTTP/1.1. This gives us a hint of why we = might >> > want all three of those. This is also really nice, since we know how >> > to switch between all of those protocols, and we have a lot of >> > experience with an ecosystem shaped like that: webtransport-quic and >> > webtransport-http3 can be switched via ALPN, webtransport-http2 can be >> > raced in parallel with the former. >> > >> > So I propose that we adapt all of them. As it stands, >> > webtransport-quic is a simple-to-implement and proven-to-work solution >> > that should not require much of working group's time. There are >> > questions regarding whether webtransport-http is too complex; I believ= e >> > that we won't know unless we try, and since there's clearly interest i= n >> > trying, I believe we should adopt that draft and actually start workin= g >> > out those complex details. >> > >> > What does everyone think? >> > >> > Cheers, >> > Victor. >> > -- >> > Webtransport mailing list >> > Webtransport@ietf.org >> > https://www.ietf.org/mailman/listinfo/webtransport >> > >> >> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --00000000000062986f05b3e9d0db Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


    =
    On Tue, Nov 10, 2020 at 8:38 AM Berna= rd Aboba <bernard.aboba@gmail= .com> wrote:
    Martin said:=C2=A0
    "It seems your arguments are based on it being possi= ble to hide a bunch of this complexity under a unified API.=C2=A0 That'= s great, but it doesn't mean that the abstraction won't leak.=C2=A0= I'm sure that running over h2 will look very different to running on b= are QUIC."

    [BA] There is a question whether h= 2 is supported within the WebTransport API:

    Part of the concer= n is the complexity that would be added by supporting failover within the A= PI, rather than outside of it.=C2=A0

    Currently, if= QUIC and associated functionality (such as datagram support) cannot be neg= otiated, the WebTransport constructor will fail.=C2=A0 Among other things t= his implies that if the WebTransport constructor succeeds and the ready pro= mise is resolved, that the datagramWritable and datagramReadable attributes= are always defined.=C2=A0

    It does not make sense = to me to pretend that datagram functionality is available when running over= a transport that does not support datagrams.=C2=A0
    =
    =C2=A0
    I don't agree with this. The availab= ility or non-availability of UDP is unpredictable to users and context-depe= ndent, and the user experience of having things just not in one network is = extremely frustrating. Moreover, we have extensive experience that it is po= ssible to provide inferior, yet somewhat acceptable, low-latency applicatio= ns such as videoconferencing even over non-datagram transport (hence the su= pport for ICE TCP and TURN TCP etc in WebRTC), especially in fast networks.= I believe the same reasoning applies here.

    -E= kr

    On Mon, Nov 9, 2020 at = 9:05 PM Martin Thomson <mt@lowentropy.net> wrote:
    Hey Victor,

    I have a hard time understanding this.

    If I recall correctly, your original proposal involved multiple protocols.= =C2=A0 So this sounds like you have discovered something that supports that= view, or at least has consolidated your own opinion.=C2=A0 But I don't= see any actual evidence here to support building multiple protocols.

    Building one protocol is hard enough.=C2=A0 It seems like we signed on to d= o two here, on the basis that we need a fallback.=C2=A0 But I don't see= how that naturally extends to three.=C2=A0 On the contrary, just one proto= col is pretty tempting at this point.=C2=A0 TCP fallback could be handled b= y a websockets polyfill outside of the browser (or a WebRTC polyfill for th= ose who are less complexity-averse).

    It seems your arguments are based on it being possible to hide a bunch of t= his complexity under a unified API.=C2=A0 That's great, but it doesn= 9;t mean that the abstraction won't leak.=C2=A0 I'm sure that runni= ng over h2 will look very different to running on bare QUIC.

    That doesn't meant that I'm not curious about your semantic unifica= tion idea.=C2=A0 I don't understand that either, but it's an abstra= ct notion with some appeal to me.

    Cheers,
    Martin

    On Wed, Oct 28, 2020, at 03:22, Victor Vasiliev wrote:
    > (previous iteration of this thread here
    > <https://mail= archive.ietf.org/arch/msg/webtransport/CEGNLkMqrvug3uPyPmQIXnWVIAY/>= )
    >
    > Hello everyone,
    >
    > As you might remember, we've still not decided which of QuicTransp= ort,
    > Http2Transport and Http3Transport we should adapt:
    >=C2=A0 1. There has been a strong interest in running WebTransport over= HTTP.
    > HTTP allows us to do connection pooling, a well-understood mechanism o= f
    > falling back to TCP and better integration with existing load balancer= s.
    >=C2=A0 2. There has also been interest in running WebTransport over QUI= C
    > itself, due to the complexity of WebTransport over HTTP, both in terms=
    > of design and in terms of writing servers for it (nice discussion here=
    > <https://mail= archive.ietf.org/arch/msg/webtransport/O8P5nmmw0ywra1VWtJmS4lBglhI/>= ).
    >=C2=A0 3. There has been a desire to pick only one of those.
    > I've been reworking <https://github.com/v= asilvv/webtransport/pull/18>
    > the QuicTransport draft based on what we've found while implementi= ng it
    > in Chrome.=C2=A0 Doing that, and observing how it becomes more and mor= e like
    > HTTP with every revision, has convinced me more than ever that all of =
    > the transports above should be the same thing conceptually, differing =
    > only in wire protocol.=C2=A0 That observation was very helpful, since = it
    > allowed us to replace <https://github.com/w3c/= webtransport/issues/129>
    > all of the different API entry points with just one, already
    > dramatically simplifying the situation.=C2=A0 Same observation also ca= n
    > potentially help us make some progress here.=C2=A0 We can unify all of= the
    > proposals semantically (make them share a URL scheme and the headers <= br> > format), and then the variants just become different encodings.
    >
    > If we compare the WebTransport proposals to the HTTP ecosystem, beside= s
    > the obvious equivalences (webtransport-http2 =E2=89=85 HTTP/2,
    > webtransport-http3 =E2=89=85 HTTP/3), it becomes apparent that
    > webtransport-quic =E2=89=85 HTTP/1.1.=C2=A0 This gives us a hint of wh= y we might
    > want all three of those.=C2=A0 This is also really nice, since we know= how
    > to switch between all of those protocols, and we have a lot of
    > experience with an ecosystem shaped like that: webtransport-quic and <= br> > webtransport-http3 can be switched via ALPN, webtransport-http2 can be=
    > raced in parallel with the former.
    >
    > So I propose that we adapt all of them.=C2=A0 As it stands,
    > webtransport-quic is a simple-to-implement and proven-to-work solution=
    > that should not require much of working group's time.=C2=A0 There = are
    > questions regarding whether webtransport-http is too complex; I believ= e
    > that we won't know unless we try, and since there's clearly in= terest in
    > trying, I believe we should adopt that draft and actually start workin= g
    > out those complex details.
    >
    > What does everyone think?
    >
    > Cheers,
    >=C2=A0 =C2=A0Victor.
    > --
    > Webtransport mailing list
    > Webtranspor= t@ietf.org
    > https://www.ietf.org/mailman/listinfo/webtran= sport
    >

    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
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The slide deck is here: https://docs.google.com/presentation/d/1zB6dcIOlKwZW8NUfYw-HtatNLpSJZBnrk-0ZpmSpfIQ/ The IETF WEBTRANS WG will meet on Monday, November 16 from 1 AM - 3 AM Pacific TIme. In other time zones, the meeting will occur on: Monday, November 16, 2020 from 09:00 - 11:00 (UTC) Monday, November 16, 2020 from 16:00 - 18:00 (Banghok). --000000000000b6dc0705b3ea981d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable --000000000000b6dc0705b3ea981d-- From nobody Thu Nov 12 11:18:48 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D86D43A0061 for ; Thu, 12 Nov 2020 11:18:46 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.096 X-Spam-Level: X-Spam-Status: No, score=-2.096 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DC_PNG_UNO_LARGO=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=unavailable autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JMjebprN2LPu for ; Thu, 12 Nov 2020 11:18:44 -0800 (PST) Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7E6FD3A005C for ; Thu, 12 Nov 2020 11:18:43 -0800 (PST) Received: by mail-lj1-x22a.google.com with SMTP id r17so7528014ljg.5 for ; Thu, 12 Nov 2020 11:18:43 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+G64eWyUzVPNoKLjQ8vRTDR1q6VO9pTPCboFjPbqM6Y=; b=qWrSEnNZgERtOms1FCLpDyfsmijA6JSN5vc8X7PXztbM9qfCRsFpNzBdYNv4dObNcW QIxsI7iffGc3dDNi13p5WiwM6+S9rEbkbjpidflS7XUwcaTyh0zZMivOezxj5UTeDNTs HZnzUDtnmAN+oXGMa6aId1DHClxm3K/NSQ1j3lDvPRZdyNZtA7JzLjYJYld2mTQwXjwq WdADwh0EjnL068uW0bnlJtTfDYnEahVna2RcDAvjuE6XvOSMrvN7Kng24o/7x2GNwx6z pwwr5Mmg4ajsmTG+ddC2w1snnAaxHLjxKNyOxcZPlFMEvt4St9Ep0w3scFtlPvoBBK2R rpdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+G64eWyUzVPNoKLjQ8vRTDR1q6VO9pTPCboFjPbqM6Y=; b=cByBuZGaqZfvfEATUoVlYNCXHFcT/dU8db6te4N/gNVXu096m7nixDMd2DihjjVW36 zAoHjbqC5dGh16woyJD+IkqErHF9DrBT4grRAoorFU6/QcCViSk6SZ1qSB5Yezj5fpF/ 8eJGW7D0OOhsd38wSB9PAojhGZwG1vAkn/WpIzY6+vqgVJJBzxSjHz6kB4aSNCOsOeSX 1Nx2MJjmB8q+WNn2GHZfHbHQVt/AaPq7MPe97HVa3RKiJFOvuYp/IfegvBUj277WahOu 6FVmOGHk7HPKQHiCzDM6MBq+zR/RDqfR7qzJQXswRSt6n+o49R46hbD+snaJiPimArnU f+ew== X-Gm-Message-State: AOAM533D9H1hEC/02yDJ1j+zw+FqQ5ySwIz2aM3O7Q9+HTET3neZnlge ctjcI9cdnWmDvdnldFawvwySOLRKmV8Utnowbg6Li5nQlbfRBA== X-Google-Smtp-Source: ABdhPJxyY0gxc5yvkdWMOEn8tn3/sALRj7Uknfc47gbcVq6Vnb4PYOT82U67z7rfRLJDEAV2Iff21nuUvk+WTQ1wpC8= X-Received: by 2002:a2e:b70d:: with SMTP id j13mr499085ljo.240.1605208720827; Thu, 12 Nov 2020 11:18:40 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Bernard Aboba Date: Thu, 12 Nov 2020 11:18:31 -0800 Message-ID: To: Luke Curley Cc: Victor Vasiliev , WebTransport Content-Type: multipart/related; boundary="00000000000098a63305b3edc745" Archived-At: Subject: Re: [Webtransport] HTTP/3 Downgrade X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 12 Nov 2020 19:18:47 -0000 --00000000000098a63305b3edc745 Content-Type: multipart/alternative; boundary="00000000000098a63105b3edc744" --00000000000098a63105b3edc744 Content-Type: text/plain; charset="UTF-8" Luke said: "My use-case is almost identical (Twitch). We're implementing a video protocol over QuicTransport instead of trying to leverage HTTP/3. It gives us the ability to push media while utilizing stock QUIC implementations. All you need on top is a simple API layer, such as JSON messages over bidirectional streams." [BA] That's a pretty straightforward way to move forward on low latency or P2P use cases (e.g. game streaming and remote desktop). HTTP/3 use cases tend to be situations where caching might be useful, or where there is a desire to leverage HTTP/3 specifically. For example, for live events you can often live with more latency (perhaps up to a second), and CDNs are widely used today to improve scalability. In the RIPT BOF, a desire to leverage cloud infrastructure was mentioned, though at the time there was scepticism as to whether that would actually be possible (and similar concerns have been raised on this thread). As for firewall traversal, QUIC connections can use the same socket and would thus share the NAT binding... assuming middleware does not decode QUIC initial packets. Each connection could end up on different host depending on load balancing though. [BA] I think the concern was not NAT traversal so much as enterprise firewalls that today often have restrictive policies (e.g. TCP-only or HTTP-only). Not sure whether those firewalls are likely to be QUIC-friendly or if so what we can assume about them when they are upgraded (e.g. MASQUE support?). So may not be easy to say exactly what the requirements will be. Has somebody formulated a list of pros and cons for Http3Transport as compared to QuicTransport? [BA] There have been some slides presented with a few basic considerations. But more detailed examination seems needed to distill requirements and get to the bottom of what implementers need as opposed to what might sound good at a superficial level but might not be deployable or implementable. The need for more detailed discussion becomes apparent when actually trying to implement some of the use cases - and realizing that in practice there are more moving parts than meets the eye. There are also DevOps issues like load balancing/draining, which has been an issue with Websockets deployment. Quite solvable but worth articulating in terms of requirements. " On Wed, Nov 11, 2020 at 5:31 PM Luke Curley wrote: > @bernard I think that use-case boils down to a lack of HTTP functionality. > The "proper" approach would be to use HTTP server push for media, but > nobody likes that. Justin's ask is to instead to augment HTTP/3 such that > it muxes in QUIC-like connections. I do think it address HTTP's > short-comings, but it's non-trivial and will require custom HTTP/3 > implementations. > > My use-case is almost identical (Twitch). We're implementing a video > protocol over QuicTransport instead of trying to leverage HTTP/3. It gives > us the ability to push media while utilizing stock QUIC implementations. > All you need on top is a simple API layer, such as JSON messages over > bidirectional streams. > > As for firewall traversal, QUIC connections can use the same socket and > would thus share the NAT binding... assuming middleware does not decode > QUIC initial packets. Each connection could end up on different host > depending on load balancing though. > > Has somebody formulated a list of pros and cons for Http3Transport as > compared to QuicTransport? > > On Wed, Nov 11, 2020 at 2:35 PM Bernard Aboba > wrote: > >> Victor said: >> >> "Http3Transport without pooling doesn't make that much sense." >> >> [BA] Some Http3Transport use cases depend on pooling between WebTransport >> and HTTP/3 request/responses; others could just be satisfied by >> WebTransport pooling. I would suggest that we distinguish these two >> requirements, because pooling/sharing a QUIC connection between >> WebTransport instances appears simpler than pooling/sharing a QUIC >> connection between WebTransport and HTTP/3. >> >> At IETF 107 RIPT BOF there was a desire expressed to enable media >> services to leverage HTTP infrastructure. Justin Uberti described a use >> case where gRPC would be sent over HTTP/3 to request that the server >> initiate either a reliable stream or flow of datagrams (see below). This >> use case appears to require pooling of WebTransport and HTTP/3 >> request/responses (in order to simplify firewall traversal). However, this >> use case is not easily supported using an garden variety HTTP/3 server, >> which probably could not initially be expected to support QUIC datagrams >> (although it would not be hard to support in node.js assuming that a QUIC >> module was available). >> >> See Slide 7 here: >> https://datatracker.ietf.org/meeting/107/materials/slides-107-ript-rtc-implementation-experiences-00 >> >> [image: image.png] >> >> On Wed, Nov 11, 2020 at 1:52 PM Victor Vasiliev > 40google.com@dmarc.ietf.org> wrote: >> >>> I'm not sure "HTTP/3 without pooling" does anything that QuicTransport >>> doesn't already do, especially since the latter got real header support. >>> So, at least as far as my understanding of this space goes, Http3Transport >>> without pooling doesn't make that much sense. >>> >>> On Wed, Nov 11, 2020 at 4:43 PM Luke Curley wrote: >>> >>>> It seems like connection pooling introduces a lot of technical >>>> complexity for limited benefits. Hypothetically, what if connection pooling >>>> was dropped as a requirement? >>>> >>>> What if Http3Transport involved establishing a new HTTP/3 connection >>>> and downgrading it to QUIC? It would be analogous to WebSockets for >>>> HTTP/1.1. >>>> >>>> You could use 0-RTT to minimize latency when establishing a HTTP/3 or >>>> Http3Transport connection to an existing host. These connections would not >>>> share congestion control state (unfortunate), but would also not share flow >>>> control limits (yay). >>>> >>>> I also think this is how you could merge QuicTransport and >>>> Http3Transport. Use HTTP/3 for the handshake, and QUIC for the data >>>> transfer. >>>> -- >>>> Webtransport mailing list >>>> Webtransport@ietf.org >>>> https://www.ietf.org/mailman/listinfo/webtransport >>>> >>> -- >>> Webtransport mailing list >>> Webtransport@ietf.org >>> https://www.ietf.org/mailman/listinfo/webtransport >>> >> --00000000000098a63105b3edc744 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Luke said:=C2=A0

    "My use-case is almost identical (Twitch). We're imp= lementing a video
    protocol over QuicTransport instead=
 of trying to leverage HTTP/3. It gives
us the ability to push media while utilizing stock QUIC implementations.
All you need on top is a simple API layer, such as JSON messages over
bidirectional streams."
    [BA] That's a pretty straig=
htforward way to move forward on low latency or P2P use cases (e.g. game st=
reaming and remote desktop).  HTTP/3 use cases tend to be situations where =
caching might be useful, or where there is a desire to leverage HTTP/3 spec=
ifically. For example, for live events you can often live with more latency=
 (perhaps up to a second), and CDNs are widely used today to improve scalab=
ility. In the RIPT BOF, a desire to leverage cloud infrastructure was menti=
oned, though at the time there was scepticism as to whether that would actu=
ally be possible (and similar concerns have been raised on this thread). 
    As for firewall traversal, QUIC connections can use the same =
socket and
    would thus share the NAT binding... assuming =
middleware does not decode
QUIC initial packets. Each connection could end up on different host
depending on load balancing though.
    [BA] I think the concern=
 was not NAT traversal so much as enterprise firewalls that today often hav=
e restrictive policies (e.g. TCP-only or HTTP-only). Not sure whether those=
 firewalls are likely to be QUIC-friendly or if so what we can assume about=
 them when they are upgraded (e.g. MASQUE support?). So may not be easy to =
say exactly what the requirements will be. 
    Has somebody for=
mulated a list of pros and cons for Http3Transport as
compared to QuicTransport?

    [BA] There have been some slides presented with a few basic=
 considerations. But more detailed examination seems needed to distill requ=
irements and get to the bottom of what implementers need as opposed to what=
 might sound good at a superficial level but might not be deployable or imp=
lementable. The need for more detailed discussion becomes apparent when act=
ually trying to implement some of the use cases - and realizing that in pra=
ctice there are more moving parts than meets the eye. 
    There=
 are also DevOps issues like load balancing/draining, which has been an iss=
ue with Websockets deployment. Quite solvable but worth articulating in ter=
ms of requirements.



    "
    =
    On Wed= , Nov 11, 2020 at 5:31 PM Luke Curley <kixelated@gmail.com> wrote:
    @bernard I think that use-ca= se boils down to a lack of HTTP functionality. The "proper" appro= ach would be to use HTTP server push for media, but nobody likes that. Just= in's ask is to instead to augment HTTP/3 such that it muxes in QUIC-lik= e connections. I do think it address HTTP's short-comings, but it's= non-trivial and will require custom HTTP/3 implementations.=C2=A0

    My use-case is almost identical (Twitch). We're implem= enting a video protocol over QuicTransport instead of trying to leverage HT= TP/3. It gives us the ability to push media while utilizing stock QUIC impl= ementations. All you need on top is a simple API layer, such as JSON messag= es=C2=A0over bidirectional streams.

    As for firewal= l traversal, QUIC connections can use the same socket and would thus share = the NAT binding... assuming middleware does not decode QUIC initial packets= . Each connection could end up on different host depending on load balancin= g though.

    Has somebody formulated a list of pr= os and cons for Http3Transport as compared to QuicTransport?
    On Wed, N= ov 11, 2020 at 2:35 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    =
    Victor s= aid:=C2=A0

    "Http3Transport without pooling doesn= 9;t make that much sense."

    [BA] Some Http3Tra= nsport use cases depend on pooling between WebTransport and HTTP/3 request/= responses; others could just be satisfied by WebTransport pooling.=C2=A0 I = would suggest that we distinguish these two requirements, because pooling/s= haring a QUIC connection between WebTransport instances appears simpler tha= n pooling/sharing a QUIC connection between WebTransport and HTTP/3.
    <= div>
    At IETF 107 RIPT BOF there was a desire expressed to ena= ble media services to leverage HTTP infrastructure. Justin Uberti described= a use case where gRPC would be sent over HTTP/3 to request that the server= initiate either a reliable stream or flow of datagrams (see below).=C2=A0 = This use case appears to require pooling of WebTransport and HTTP/3 request= /responses (in order to simplify firewall traversal).=C2=A0 However, this u= se case is not easily supported using an garden=C2=A0variety HTTP/3 server,= which probably could not initially be expected to support QUIC datagrams (= although it would not be hard to support in node.js assuming that a QUIC mo= dule was available).=C2=A0


    =3D"image.png"

    On Wed, Nov 11,= 2020 at 1:52 PM Victor Vasiliev <vasilvv=3D40google.com@dmarc.ietf.org> wr= ote:
    I'm not sure "HTTP/3 without pooling" does anything tha= t QuicTransport doesn't already=C2=A0do, especially since the latter go= t real header support.=C2=A0 So, at least as far as my understanding of thi= s space goes, Http3Transport without pooling doesn't make that much sen= se.

    On Wed, Nov 11, 2020 at 4:43 PM Luke Curley <kixelated@gmail.com> wrote:
    <= div>It seems like connection pooling introduces a lot of technical complexi= ty for limited benefits. Hypothetically, what if connection pooling was dro= pped as a requirement?=C2=A0

    What if Http3Tr= ansport involved establishing a new HTTP/3 connection and downgrading it to= QUIC? It would be analogous to WebSockets for HTTP/1.1.=C2=A0=C2=A0

    You could use 0-RTT to minimize latency when es= tablishing a HTTP/3 or Http3Transport connection to an existing host. These= connections would not share congestion control state (unfortunate), but wo= uld also not share flow control limits (yay).
    I also think this is how you could merge QuicTransport and Htt= p3Transport. Use HTTP/3 for the handshake, and QUIC for the data transfer.<= /div>
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
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multipart/alternative; boundary="00000000000021a20f05b3fe5b0f" --00000000000021a20f05b3fe5b0f Content-Type: text/plain; charset="UTF-8" On Wed, Nov 11, 2020 at 5:35 PM Bernard Aboba wrote: > Victor said: > > "Http3Transport without pooling doesn't make that much sense." > > [BA] Some Http3Transport use cases depend on pooling between WebTransport > and HTTP/3 request/responses; others could just be satisfied by > WebTransport pooling. I would suggest that we distinguish these two > requirements, because pooling/sharing a QUIC connection between > WebTransport instances appears simpler than pooling/sharing a QUIC > connection between WebTransport and HTTP/3. > I'm actually not sure about that. Managing connection pools can be fairly hard, so I would not be surprised if implementing pooled WebTransport without HTTP required more code than just using HTTP/3. Design-wise, almost all hard problems (things like flow control) are issues for both. > > At IETF 107 RIPT BOF there was a desire expressed to enable media services > to leverage HTTP infrastructure. Justin Uberti described a use case where > gRPC would be sent over HTTP/3 to request that the server initiate either a > reliable stream or flow of datagrams (see below). This use case appears to > require pooling of WebTransport and HTTP/3 request/responses (in order to > simplify firewall traversal). However, this use case is not easily > supported using an garden variety HTTP/3 server, which probably could not > initially be expected to support QUIC datagrams (although it would not be > hard to support in node.js assuming that a QUIC module was available). > > See Slide 7 here: > https://datatracker.ietf.org/meeting/107/materials/slides-107-ript-rtc-implementation-experiences-00 > > [image: image.png] > I've been thinking about this, and I am not entirely convinced this is specific to Http3Transport. There are many reasons why HTTP load balancers usually work on L7 instead of L4, but the main ones are roughly: (1) this lets them optimize content (caching, compression, etc), (2) L7 LB can fan out requests from a single HTTP connection to multiple backends. The first one doesn't really apply that much to WebTransport (since we can't do things like caching), and the second one is just a benefit of Http3Transport being pooled. QuicTransport is probably perfectly fine being load balanced at L4. >From my perspective, the main benefit of Http3Transport is pooling support, and pretty much everything else should work for QuicTransport too. Another benefit is ability to fall back to Http2Transport when UDP is blocked (I understand that Http2Transport is not compelling for *existing* systems that already work over TCP, but if I were to build a *completely new* thing over WebTransport, I would want it to handle networks with no UDP for me). --00000000000021a20f05b3fe5b0f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    On Wed, Nov 11, 2020 at 5:35 PM Bernard A= boba <berna= rd.aboba@gmail.com> wrote:
    Victor said:= =C2=A0

    "Http3Transport without pooling doesn't = make that much sense."

    [BA] Some Http3Transpo= rt use cases depend on pooling between WebTransport and HTTP/3 request/resp= onses; others could just be satisfied by WebTransport pooling.=C2=A0 I woul= d suggest that we distinguish these two requirements, because pooling/shari= ng a QUIC connection between WebTransport instances appears simpler than po= oling/sharing a QUIC connection between WebTransport and HTTP/3.

    I'm actually not sure about that.=C2= =A0 Managing connection pools can be fairly hard, so I would not be surpris= ed if implementing pooled WebTransport without HTTP required more code than= just using HTTP/3.

    Design-wise, almost all hard problems (th= ings like flow control) are issues for both.
    =C2=A0

    <= div>At IETF 107 RIPT BOF there was a desire expressed to enable media servi= ces to leverage HTTP infrastructure. Justin Uberti described a use case whe= re gRPC would be sent over HTTP/3 to request that the server initiate eithe= r a reliable stream or flow of datagrams (see below).=C2=A0 This use case a= ppears to require pooling of WebTransport and HTTP/3 request/responses (in = order to simplify firewall traversal).=C2=A0 However, this use case is not = easily supported using an garden=C2=A0variety HTTP/3 server, which probably= could not initially be expected to support QUIC datagrams (although it wou= ld not be hard to support in node.js assuming that a QUIC module was availa= ble).=C2=A0


    I've been thinking about this, and I am not entirely convinced = this is specific to Http3Transport.=C2=A0 There are many reasons why HTTP l= oad balancers usually work on L7 instead of L4, but the main ones are rough= ly: (1) this lets them optimize content (caching, compression, etc), (2) L7= LB can fan out requests from a single HTTP connection to multiple backends= .=C2=A0 The first one doesn't really apply that much to WebTransport (s= ince we can't do things like caching), and the second one is just a ben= efit of Http3Transport being pooled.=C2=A0 QuicTransport is probably perfec= tly fine being load balanced at L4.

    From my perspe= ctive, the main benefit of Http3Transport is pooling support, and pretty mu= ch everything else should work for QuicTransport too.=C2=A0 Another benefit= is ability to fall back to Http2Transport=C2=A0when UDP is blocked (I unde= rstand that=C2=A0Http2Transport=C2=A0is not compelling for existing = systems that already work over TCP, but if I were to build a completely = new thing over WebTransport, I would want it to handle networks with no= UDP for me).
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[71.227.236.207]) by smtp.gmail.com with ESMTPSA id t9sm16466230pje.1.2020.11.14.19.45.21 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 14 Nov 2020 19:45:22 -0800 (PST) From: Bernard Aboba X-Google-Original-From: Bernard Aboba Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (1.0) Date: Sat, 14 Nov 2020 19:45:21 -0800 Message-Id: To: WebTransport X-Mailer: iPad Mail (18B92) Archived-At: Subject: [Webtransport] Volunteers? X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 15 Nov 2020 03:45:25 -0000 For the IETF 109 WEBTRANS WG meeting we will need volunteers for note taking= and Jabber Scribe. Any volunteers?= From nobody Mon Nov 16 01:47:02 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 26FC63A16A1 for ; Mon, 16 Nov 2020 01:47:00 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=mnot.net header.b=FFyNiuHu; dkim=pass (2048-bit key) header.d=messagingengine.com header.b=p62EVByj Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NMyZdlqVyD2V for ; Mon, 16 Nov 2020 01:46:58 -0800 (PST) Received: from out1-smtp.messagingengine.com (out1-smtp.messagingengine.com [66.111.4.25]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B3143A16BD for ; Mon, 16 Nov 2020 01:46:58 -0800 (PST) Received: from compute2.internal (compute2.nyi.internal [10.202.2.42]) by mailout.nyi.internal (Postfix) with ESMTP id 3C8485C003B for ; Mon, 16 Nov 2020 04:46:56 -0500 (EST) Received: from mailfrontend1 ([10.202.2.162]) by compute2.internal (MEProxy); Mon, 16 Nov 2020 04:46:56 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mnot.net; h=from :content-type:content-transfer-encoding:mime-version:subject :message-id:date:to; s=fm1; bh=hB9nPglccJaX/hPj3UQ1mHcq9d9P2nzRd jSJSzrw8dU=; b=FFyNiuHu/ApdvULtjGZ+0ZrvepWVYPqCdMgNCncMki4WilORu CbFGYECHibqpJxkDfyq4TUGiz8cqd5VaMdUO4FILVmAPiPuz+423dfbOnVJeHjoY 2GWHTMVA7IvT5pC/zmlXXm7Rg2w6/EziGotfOf4RBa5kYxEjj2vJ+UT46ksa9qM9 sP/tCskmCkO5+Mee6KUBgUScsEvlQK61FXklczHRrVHLrL2y3Kz29MEaBgRHzKuh lztASIHvJJCzSp9TM52U9HuNWDZsbGzx+33F1hkdtWolLN4fHTRtPCQVJYHfdUiH NV/DePVP2O6EP/fuCOtbJ12Uo1Rm+JC2dJ1kA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=content-transfer-encoding:content-type :date:from:message-id:mime-version:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=hB9nPg lccJaX/hPj3UQ1mHcq9d9P2nzRdjSJSzrw8dU=; b=p62EVByjUJ3z828gsoxJRy gwNJAJz/JnaS4jh+/aBKmeoWm2CyU+05DPmFHdcNt5OZ5W9VvHM/eKwxvTZX+yYh BcVzT9Ci8Ei6oVVBZEnL8jY1Drp01m0sU/ZV3NzBjoJPKkm0iCcbbD0VHO22JIIf dF+u+41Ar5ewKqPTsBa7qU2Rl+3xyJgwwgESAIVZ8tGzgZJpdB0IQNcmyLp8cW0q QK3jQQb60qtzWJYP2S71Oo9pHlA+WC3UsE1AFDMHk12PAAx7+wS2eJrtuCJxXYu5 7RdxzWaklCIQ/ZuVOlCIn3GPxswhW0vpT47/xmYHnnTQtI1gLi3GjFljZCnbuyXw == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedujedrudefuddgtdelucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucenucfjughrpefhtgfgggfukfffvffosehtqhhmtd hhtddvnecuhfhrohhmpeforghrkhcupfhothhtihhnghhhrghmuceomhhnohhtsehmnhho thdrnhgvtheqnecuggftrfgrthhtvghrnhepgfevkeeiieegleejkeefvdffuefflefhud dutdetfeduleefffejuddtvdegfeffnecuffhomhgrihhnpehmnhhothdrnhgvthenucfk phepudduledrudejrdduheekrddvhedunecuvehluhhsthgvrhfuihiivgeptdenucfrrg hrrghmpehmrghilhhfrhhomhepmhhnohhtsehmnhhothdrnhgvth X-ME-Proxy: Received: from [192.168.7.30] (119-17-158-251.77119e.mel.static.aussiebb.net [119.17.158.251]) by mail.messagingengine.com (Postfix) with ESMTPA id 443573280064 for ; Mon, 16 Nov 2020 04:46:55 -0500 (EST) From: Mark Nottingham Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Message-Id: <0E2D3F5B-4F1D-494A-8660-02201C7B9F28@mnot.net> Date: Mon, 16 Nov 2020 20:46:52 +1100 To: webtransport@ietf.org X-Mailer: Apple Mail (2.3608.120.23.2.4) Archived-At: Subject: [Webtransport] CDN support X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 09:47:00 -0000 [ Since meetecho seemed to be having problems (I can't get back into the = meeting, and jabber seems to be perma-segmented), I'll say what I queued = for here ] I see that there are questions as to whether CDNs will support = WebTransport. It's important to understand that from a CDN's perspective, WebTransport = is very similar to WebSockets. If by 'support' you mean 'proxy = connections 1:1, and maybe do some access control and routing on them' = -- yes, CDNs can support WebTransport (whether they will is of course a = different question). However, if you want something more sophisticated, like caching or = fanout of messages, WebTransport doesn't provide anything for a CDN to = "grab onto", in terms of message delimitation or semantics. When WebSockets was created, the assumption was that a 'thousand flowers = would bloom' and eventually the market would choose a few winners, and = infrastructure could focus on optimising that. That hasn't happened in = the intervening decade+. I have a few suspicions as to why, but that's = probably a separate discussion. So it would be very good if folks who are asking for CDN support to be = super-specific about what they want, and also to be realistic about what = they're likely to get. The bargain of WebTransport is that it's a = protocol construction toolkit -- just like WebSockets -- where you build = everything yourself. You can't have it both ways, unless someone does = the work to build the semantic 'handles' on top of it in a way that = infrastructure can use -- and once you start doing that, you might find = yourself re-inventing HTTP. Cheers, -- Mark Nottingham https://www.mnot.net/ From nobody Mon Nov 16 02:06:07 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 25FAB3A16C1 for ; Mon, 16 Nov 2020 02:06:06 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.848 X-Spam-Level: X-Spam-Status: No, score=-1.848 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id vNu9SA09oXOZ for ; Mon, 16 Nov 2020 02:06:05 -0800 (PST) Received: from mail-ej1-x62b.google.com (mail-ej1-x62b.google.com [IPv6:2a00:1450:4864:20::62b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F03293A16BD for ; Mon, 16 Nov 2020 02:06:04 -0800 (PST) Received: by mail-ej1-x62b.google.com with SMTP id oq3so23555699ejb.7 for ; Mon, 16 Nov 2020 02:06:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=u88al560IQNsC5Vj/4Q3sxMY0x99YAudf+bBhsAXPao=; b=kDWNorKgHhzCZLSprVN4GGGQwmo77QIzG9Dty1SRgTA8fVdVnHtsCgfCRbwbZ77J9B ocegtGz3OkjQfG7IMZxBeytZ2PeiSDiRJkJbRwVhTiDMFyxQ7CInXu28zBwBqicudREK LCHwiBQcDK90h19cVq4+sqEKESrwSF6uB1zl6D//Kbq0pyxD4StKP7A/ta0TGOZznnBY ZJ/PyZSAc/RzsEIH6DRs1Tij51IYuuZeoMRHVIhuhBvtiSzBia9r5zJ2zcrj0unVXA+3 QhIE3qo2dwa77Pa5a0EegsIO6xVqyC+cRnGdZcJ2f1uiTQDhbxaQmgGTuzvV4F1/JPGM 03lQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=u88al560IQNsC5Vj/4Q3sxMY0x99YAudf+bBhsAXPao=; b=GLT/GHRyrFIqtRzaw/fGlf7NvwE5h2B3C9jTN/vlk3Z2dHt8e5bNfdGBGoxcYOBRQ0 yqv7/PlJGeH0pgclGMnvS5aPf0u9kbHXfWPziARQG+BZCUXw2blyTcJgKKmYAB51EYdj KghWssUuQNwU3zCjOxRCk3OVgmEhr0cCRpPBKrZ1WXM6cBFdECKPLZWcsEcRV+RuXFyS 3+34cYyhJTnqPMKJFR+WZ5FUd6AaMP1wSq+pdHXT7njn3SXAFH12xOizWMIkRjbMnBfC 3Tr93ccNbpw3bmGaFGMth3W4oscIXfFx3TBmW/mlpzG7r98sk8wRth2Vbq2D6rSJTHuq Ovbg== X-Gm-Message-State: AOAM533UwRH6ig8aqZUHF+mdE6njfBUknVi8KMCjteT0zkGHdNojw6Cg zRXomjfy532NLjSlxCAm0Cu4mhTnFypkPEbkwuU= X-Google-Smtp-Source: ABdhPJwyKO15maLpt/zt8YaYmzMJKP4O6IfphSLDpMdYFn/O9JTZt6l+VykHR5tATXTEWPJ30mYTvpwsGkU76gJmKk8= X-Received: by 2002:a17:906:5e45:: with SMTP id b5mr13768715eju.46.1605521163115; Mon, 16 Nov 2020 02:06:03 -0800 (PST) MIME-Version: 1.0 References: <0E2D3F5B-4F1D-494A-8660-02201C7B9F28@mnot.net> In-Reply-To: <0E2D3F5B-4F1D-494A-8660-02201C7B9F28@mnot.net> From: Lucas Pardue Date: Mon, 16 Nov 2020 10:05:53 +0000 Message-ID: To: Mark Nottingham Cc: WebTransport Content-Type: multipart/alternative; boundary="0000000000009b60e605b4368649" Archived-At: Subject: Re: [Webtransport] CDN support X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 10:06:06 -0000 --0000000000009b60e605b4368649 Content-Type: text/plain; charset="UTF-8" +1 --0000000000009b60e605b4368649 Content-Type: text/html; charset="UTF-8"
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    --0000000000009b60e605b4368649-- From nobody Mon Nov 16 02:10:41 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A9E9D3A16C2 for ; Mon, 16 Nov 2020 02:10:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JVwOF5LLH7q8 for ; Mon, 16 Nov 2020 02:10:38 -0800 (PST) Received: from mail-oi1-x22d.google.com (mail-oi1-x22d.google.com [IPv6:2607:f8b0:4864:20::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 58E193A16CF for ; Mon, 16 Nov 2020 02:10:38 -0800 (PST) Received: by mail-oi1-x22d.google.com with SMTP id k26so18247186oiw.0 for ; Mon, 16 Nov 2020 02:10:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=f2mpnegUmOijmYuRlaDd0TiS9JYNd1BzbqPsr4lb6kA=; b=reuFoR3UP5L6JsdgjjynbirZR2zCnJYZPILWDzIod2fOR9Z7F5zmebWH+A1y9frvAm +/z9ZLQiJ7ewN4sQ/il09G2sjMnDQ6VzPYDGBZZFO25sY5E2yi7jEV4ovbHqATsGsBIw hw1ycwWBnIbZNSWzK2aAM/cJ03wLsbmMerKnBKuk3Ye66zkHhMtqSLT8Ul6YlZIU0Xg/ mBAjwORBrG7xMOQ5euvJbD4Rh/PLyCwijwXZLWU3kJFSoxzLYfdtcRvd/2iwMDfifjr2 nYzVNIuTSXu16z8gCa4hvrOqXHcc9Qz239lt/WC4vI5ejZUbwhTLtJvebF1kBpa8fGwc 4hAQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=f2mpnegUmOijmYuRlaDd0TiS9JYNd1BzbqPsr4lb6kA=; b=dhB4QAMyUQyRl+hWVNCV91Xuibbtj9L9Ok1f/mMbzW3Gv67HfuzZ5vsz4atyvwHD5z XHzyM4jT72pe0GC780X2FcdD2TEdPo9ArJST5O9oGSLR+MpK1AV+Ov4svHP7+i79t8cF PUshqGfVOL9EBVUsW91Jb3x1IBKMFZYuJLZejhwDyQbQ3z39NR2kn2gaC04SYeupZ890 IksVfiGhU8yuXzk4Dh9WxP0k/ksNSkinj79cIvYzNPTV8msX9yfLsy+XkmQ7rc3Q3RPK GzKtp5U3s2Y2n1aSQJymEzTlEyOGuzlmWyE66RYyR/630PySnXd8MngE1zF873pd1fYg ucqg== X-Gm-Message-State: AOAM532dZIaubbrbusMRrozME9CSVORmMUyScYP86HTFEf1R+RcWyuzo kEk9VxjKkhMREcQLUhhYAWbBK3Ms/8tPqaB9kbo= X-Google-Smtp-Source: ABdhPJxyBOkdTrYKEX4WKqkWJZ+r/s4bA+DYoWQifVz0uwN0oHzbdRNhBh0KQV/Bq5HCAtdOJTHZOfbsmeG5p/qnTdg= X-Received: by 2002:a05:6808:d0:: with SMTP id t16mr8674032oic.79.1605521437587; Mon, 16 Nov 2020 02:10:37 -0800 (PST) MIME-Version: 1.0 References: <0E2D3F5B-4F1D-494A-8660-02201C7B9F28@mnot.net> In-Reply-To: From: Luke Curley Date: Mon, 16 Nov 2020 02:10:27 -0800 Message-ID: To: Lucas Pardue Cc: Mark Nottingham , WebTransport Content-Type: multipart/alternative; boundary="000000000000f77e9805b4369652" Archived-At: Subject: Re: [Webtransport] CDN support X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 10:10:40 -0000 --000000000000f77e9805b4369652 Content-Type: text/plain; charset="UTF-8" Yeah, there might be a misconception that HTTP == CDN support. All of the WebTransport protocols are equally difficult for CDNs to support as they are designed for 1:1 sessions and have no caching/fanout semantics like HTTP. On Mon, Nov 16, 2020 at 2:06 AM Lucas Pardue wrote: > +1 > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --000000000000f77e9805b4369652 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Yeah, there might be a misconception that HTTP =3D=3D CDN = support. All of the WebTransport protocols are equally difficult for CDNs t= o support as they are designed for 1:1 sessions and have no caching/fanout = semantics like HTTP.

    On Mon, Nov 16, 2020 at 2:06 AM Lucas Pardue <lucaspardue.24.7@gmail.com> = wrote:
    +1
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000f77e9805b4369652-- From nobody Mon Nov 16 03:16:24 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4027C3A0A16 for ; Mon, 16 Nov 2020 03:16:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.848 X-Spam-Level: X-Spam-Status: No, score=-1.848 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Vngc9k-ZCL25 for ; Mon, 16 Nov 2020 03:16:22 -0800 (PST) Received: from mail-ej1-x630.google.com (mail-ej1-x630.google.com [IPv6:2a00:1450:4864:20::630]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id CF5A63A0A10 for ; Mon, 16 Nov 2020 03:16:21 -0800 (PST) Received: by mail-ej1-x630.google.com with SMTP id f20so23858024ejz.4 for ; Mon, 16 Nov 2020 03:16:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=p8yKhUk8GaskbJFGfTyzvsD92wCHY8F8CYz88ZXRnK4=; b=iDfLk9LRb94fYMlTAtdXYrUNSK3jX8TEOE2jrtHLFXO0tW71nyhYUn9sUpDGZ6STIw knwej2JGuyS60JQXs+SkSENy+uUyKGG0VNuM/jn9ZNcCNrwFchswU62RKX32F8asBVsE LcSEaNmNXLbSmzFZZOZH9XIi93YQIdoO4vpRCqBfdkXifY4TXvZRqo/vFceQ3UYcH8Ql ueqesxsS0b8xUQ/dvISyHPlH1YjzN9jnA1neExIRjufHe/Whv4eQ8MX1RJU9pHWz3lgD tZr/s58Nsq1oxUycY4cWqdyr3BecFlcJq6XQzhc7r4eJmsY1G2Vke6/cs/jSgGbpxFDV NEJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=p8yKhUk8GaskbJFGfTyzvsD92wCHY8F8CYz88ZXRnK4=; b=LsMg9cpdlhezPPqXPZwQzfiFloSeDCSkvIli48mcrsmGRbUoUB5ndzgv2y8dc27Kch 8fwQh5qXhUpIPr20OxzBmCaZ20P1RnqIKLcX4FTvTvM5AiDeVNIhtPx/04alPAS2fhru Xtp28zDJLuopzIk6mc1PZUq9kJLkC72U4W16iXT40DXnXJbZglQuCt+o6Lj+VD16eEe4 kQ77mwC1U++iMYUeYwtcC0vq9yraZ/zF9ShOXehdGWc4gXPbXVODgmMOlA+qxz629tX5 dquW/ItRxNHZQauaSPihxovC92fvAyU4ijd/HjVviaKKmwAHcX4O31aI69u5OyRS2PgS kf2A== X-Gm-Message-State: AOAM530b+DHOSWQbouyiuGsDyxdsKCo+0cfaCgAeHe/0LTqr9rWpU5I8 YaZJFNBLeykCwtZTOPm7SGkEejOqkPmDMeXNo2YuCn5LQe8= X-Google-Smtp-Source: ABdhPJzGRNndMNrJ7h7C29ukIAnve2sZ5n6moPpreUYh4+xdv1kUUOxhvnOW9YCYKRfrVsaycSL0jI/TO/KqY/674tQ= X-Received: by 2002:a17:906:5e45:: with SMTP id b5mr13987692eju.46.1605525379554; Mon, 16 Nov 2020 03:16:19 -0800 (PST) MIME-Version: 1.0 From: Lucas Pardue Date: Mon, 16 Nov 2020 11:16:08 +0000 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="000000000000ed236e05b43781f5" Archived-At: Subject: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 11:16:23 -0000 --000000000000ed236e05b43781f5 Content-Type: text/plain; charset="UTF-8" Hi folks, To follow up on one thread of discussion during IETF 109. To over simplify what we've heard a few folks say, they prefer QuicTransport because it simpler and they don't need pooling. I'd like to push more on this, what is the measurable complexity of HTTP/3 over QUIC plus a new application mapping that needs to be defined? Let's isolate pooling as a variable and ignore it. Victor mentioned his proposal for a unified header semantic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. Taking a closer look at it, I have some concerns that I added as comments. HTTP has semantics for a reason. If QuicTransport is going to start borrowing HTTP piecemeal, I really wonder how simple people might feel it is. I think it's important to avoid something that looks like HTTP but behaves differently. Is it really much of a stretch to just do HTTP/3 but give it a different ALPN so that we avoid problems related to cross-protocol pooling? Cheers, Lucas --000000000000ed236e05b43781f5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Hi folks,

    To follow up on on= e thread of discussion during IETF 109. To over simplify what we've hea= rd a few folks say, they prefer QuicTransport because it simpler and they d= on't need pooling.

    I'd like to push more o= n this, what is the measurable complexity of HTTP/3 over QUIC plus a new ap= plication mapping that needs to be defined? Let's isolate pooling as a = variable and ignore it.

    Victor mentioned his propo= sal for a unified header semantic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/= 4/files. Taking a closer look at it, I have some concerns that I added = as comments. HTTP has semantics for a reason. If QuicTransport is going to= start borrowing HTTP piecemeal, I really wonder how simple people might fe= el it is. I think it's important to avoid something that looks like HTT= P but behaves differently. Is it really much of a stretch to just do HTTP/3= but give it a different ALPN so that we avoid problems related to cross-pr= otocol pooling?

    Cheers,
    Lucas
    <= /div> --000000000000ed236e05b43781f5-- From nobody Mon Nov 16 04:26:17 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id ADAEF3A0E08 for ; Mon, 16 Nov 2020 04:26:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id K0cqaPlqHHSC for ; Mon, 16 Nov 2020 04:26:14 -0800 (PST) Received: from mail-oi1-x22e.google.com (mail-oi1-x22e.google.com [IPv6:2607:f8b0:4864:20::22e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2308A3A0E07 for ; Mon, 16 Nov 2020 04:26:14 -0800 (PST) Received: by mail-oi1-x22e.google.com with SMTP id t16so18514756oie.11 for ; Mon, 16 Nov 2020 04:26:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=YJ2LEXCkBA/hFOR+VQXKxrrEqzuRc2JeSf/0OS8R2Vs=; b=JH6GUJ3YDUM97sLB/NbkOUXDG2qJSfdJ1RNKVelycWBfGsOGFzA5TUbX6IxRpYt78i bvTUTAh+PlNc+fVtVblCmSvsQQx+QKvFg1jQmKURCQPhIYdsT029uf7RAJqeUQAMY9pV drS9BYvqTuXMyNQuTSLhO+MyDv5nlD8x00FeYN1Z5t10fP58+FSKFuDbA5EyfiOxIpGO 9EalCEuO0sUN4/hKqBU2kOjxpxy+gN0y/xepObbZKlhY7rQI8l7v5NET5JWG0xSYKbzR sdsnkjWn+9PdFaG+gobTev+OtscUJd6RYtVXP9lY5IfrGYFrUG9KU5c9IOowVPq3ZCM8 N3cA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=YJ2LEXCkBA/hFOR+VQXKxrrEqzuRc2JeSf/0OS8R2Vs=; b=JyhtG4kRy/fj6vcw8/0cCz3xJA15zoGssAMvJ03KEySO3VioIPeF6xrzMar290Gpbq Be6PqeQBLHTRCgDvoS3hk5JFH6HPeh2VvTc2ry5/oa8KRwhYbn6ec6c8XBoX/3I1grkc AmMlEYA15ZJYEF4AKhqrmmKMd5U/wKnQL7Pjdd2HOzUmlCIBkUartsW3OX5z2/B+uNl8 f14YUZwafnwkpES872FxhWYz3+dC7tEsH8GSUZJ2CS/JNg7iFATL8kIxXDBvdVoYsCow gGBSyZRxgczZE7qbLmkXtOA407+jxWOWXJ5dNTjO2rpcK2nHgE3bAlOCl8JLHMRU5G+G OGZg== X-Gm-Message-State: AOAM532S8WX/hMZdPEa3TqGm9nHHPOkb9Ay0KJRg1XcOYG4eFiUcl7rw /Hk1/7JnVxbdUw/haKLDLcIaykvNwkqvR1a8ltkx92VVzNrCQg== X-Google-Smtp-Source: ABdhPJykgADNvo4dzag0ZOCjTmXnBPm6aAtlJ8Bnxz62MKjnKNohbOvBToESjfK+vROUMt6CUfbPx01HQhystRDs+d0= X-Received: by 2002:aca:c787:: with SMTP id x129mr9228834oif.168.1605529573438; Mon, 16 Nov 2020 04:26:13 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Luke Curley Date: Mon, 16 Nov 2020 04:26:03 -0800 Message-ID: To: Lucas Pardue Cc: WebTransport Content-Type: multipart/alternative; boundary="000000000000e6b76705b4387b2b" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 12:26:16 -0000 --000000000000e6b76705b4387b2b Content-Type: text/plain; charset="UTF-8" Just to clarify, when I say "QuicTransport is simpler" I really mean "QuicTransport has greater interoperability". You can take any QUIC implementation (+ datagram extension) and add a thin layer to support QuicTransport. It's a nice layering of protocols and it's something that I want to see in general as QUIC replaces TCP. On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue wrote: > Hi folks, > > To follow up on one thread of discussion during IETF 109. To over simplify > what we've heard a few folks say, they prefer QuicTransport because it > simpler and they don't need pooling. > > I'd like to push more on this, what is the measurable complexity of HTTP/3 > over QUIC plus a new application mapping that needs to be defined? Let's > isolate pooling as a variable and ignore it. > > Victor mentioned his proposal for a unified header semantic across all > transports, this is > https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. > Taking a closer look at it, I have some concerns that I added as comments. > HTTP has semantics for a reason. If QuicTransport is going to start > borrowing HTTP piecemeal, I really wonder how simple people might feel it > is. I think it's important to avoid something that looks like HTTP but > behaves differently. Is it really much of a stretch to just do HTTP/3 but > give it a different ALPN so that we avoid problems related to > cross-protocol pooling? > > Cheers, > Lucas > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --000000000000e6b76705b4387b2b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Just to clarify, when I say "QuicTransport is si= mpler" I really mean "QuicTransport has greater interoperability&= quot;. You can take any QUIC implementation (+ datagram extension) and add = a thin layer to support QuicTransport. It's a nice layering of protocol= s and it's something that I want to see in general as QUIC replaces TCP= .

    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <lucaspardue.24.7@gmail.com= > wrote:
    Hi folks,

    To follow up on one th= read of discussion during IETF 109. To over simplify what we've heard a= few folks say, they prefer QuicTransport because it simpler and they don&#= 39;t need pooling.

    I'd like to push more on th= is, what is the measurable complexity of HTTP/3 over QUIC plus a new applic= ation mapping that needs to be defined? Let's isolate pooling as a vari= able and ignore it.

    Victor mentioned his proposal = for a unified header semantic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-= overview/pull/4/files. Taking a closer look at it, I have some concerns= that I added as comments. HTTP has semantics for a reason. If QuicTranspo= rt is going to start borrowing HTTP piecemeal, I really wonder how simple p= eople might feel it is. I think it's important to avoid something that = looks like HTTP but behaves differently. Is it really much of a stretch to = just do HTTP/3 but give it a different ALPN so that we avoid problems relat= ed to cross-protocol pooling?

    Cheers,
    Lu= cas
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000e6b76705b4387b2b-- From nobody Mon Nov 16 04:49:18 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 2AA2F3A0E61 for ; Mon, 16 Nov 2020 04:49:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.847 X-Spam-Level: X-Spam-Status: No, score=-1.847 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id l0Jk_KR8RD4M for ; Mon, 16 Nov 2020 04:49:15 -0800 (PST) Received: from mail-ed1-x534.google.com (mail-ed1-x534.google.com [IPv6:2a00:1450:4864:20::534]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 397E63A0E5F for ; Mon, 16 Nov 2020 04:49:15 -0800 (PST) Received: by mail-ed1-x534.google.com with SMTP id e18so18586264edy.6 for ; Mon, 16 Nov 2020 04:49:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ZWNKS+LYB5cf5P/lZh1Gje4OUWaxbptiSACS6LmOnDc=; b=stjpMLn6ShVX1ao5rpxwwLUaQjC3R6jGTdVErqvlI1wKGgJ7z7fJiOUMm1fEt4g93s Sx3nGH7fMpH8LhxF3jMil1B5SBq7mj7mtjqKxhYP6PwHH2tpdhQ7MgAn0LK89eaoApc2 d2+1cfXYVdQjxEpfm34NDbcgIQYCc+2rCIY7paPoioIaXRuL0z1E0vKdmIEZ/5i0HJq+ 1Rph8lkhqEgyKNvcGSaoC5QWq5d+Hmy2MkGAoXRX3Eu0s/zMGtq4QvCb52GYQbGD78Uq CzkoBanow1nMT1sNtgNCkj+cnXZCnA3i7cXUvhLjB01HHq2soizmwEs1w9mbgZFbGzBf rtRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ZWNKS+LYB5cf5P/lZh1Gje4OUWaxbptiSACS6LmOnDc=; b=O01uu+34RAfVAvChCrqMXQyPZEQAN4ffWzu1sF7kM3I6wJgHa+noyGpXK2L5dvlaGf jU5PaPKyqtw32LyEOMUcn04c4dnUqLHGCov7KmTeugsHGONvlnxTrGEI1hOfJjyD2fem gRB4S2iop2RV+k+RxDt9PUqZ75fdT2QRHRcmqMWB5+liy6JLAnOa61OHqZcRzk8q8/0k nFkNUxWXWMtka19P197pLbVyG8Qk2Bi4w4WLJwRuznvFyAbt5vSFeSowJdaTbpTEmWHT W078Y657SJjq64VHKQBuGVDC/mNdyqdZNAovzqhFg6EGiSWRfic2Zm5yA1wFuICtaHqH J56Q== X-Gm-Message-State: AOAM531/lE6HDqa1X9F9bMC4ZtqyumqkjDc1n+Fo/CRBPxHoP0gy6EYG h1Mpi+qnDop2DdDGifijPLYbO7ksxqGYYQHh+Fw= X-Google-Smtp-Source: ABdhPJzV3PGh91EZPka11xMiObFIMEtj8OpNc05nUFDF4YoZG06dOIVG5Lq9NrWDxYG0XCvMuQs2gzsEbHdkFMInbuU= X-Received: by 2002:a05:6402:1c8e:: with SMTP id cy14mr16017366edb.39.1605530953828; Mon, 16 Nov 2020 04:49:13 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Lucas Pardue Date: Mon, 16 Nov 2020 12:49:03 +0000 Message-ID: To: Luke Curley Cc: WebTransport Content-Type: multipart/alternative; boundary="0000000000002dcf3d05b438ce1b" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 12:49:17 -0000 --0000000000002dcf3d05b438ce1b Content-Type: text/plain; charset="UTF-8" Hi Luke, On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: > Just to clarify, when I say "QuicTransport is simpler" I really mean > "QuicTransport has greater interoperability". You can take any QUIC > implementation (+ datagram extension) and add a thin layer to support > QuicTransport. It's a nice layering of protocols and it's something that I > want to see in general as QUIC replaces TCP. > Thanks for the clarification. I appreciate the sentiment. But given the development of QUIC its kind of surprising that people would find it easier to identify an implementation that supports QUIC and datagram but does not support HTTP/3. Thr situation for a more clean-room implementation is different, I agree. However, by the time you've done all the hard stuff with QUIC, a very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic compression, server push and extensibility points. I also see the current design being the thin end of the wedge. The proposal I linked talks about HTTP-like header parsing. So its "just" a thin layer to do some parsing. Then folks will probably want some want to tweak parameter, acontrol channel, a way to do graceful close, a sprinkle of GREASE. To extrapolate forward, what would be the delta be between some final product QuicTransport and HTTP/3. Too small a delta and we've wasted years of effort. Cheers Lucas > On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue > wrote: > >> Hi folks, >> >> To follow up on one thread of discussion during IETF 109. To over >> simplify what we've heard a few folks say, they prefer QuicTransport >> because it simpler and they don't need pooling. >> >> I'd like to push more on this, what is the measurable complexity of >> HTTP/3 over QUIC plus a new application mapping that needs to be defined? >> Let's isolate pooling as a variable and ignore it. >> >> Victor mentioned his proposal for a unified header semantic across all >> transports, this is >> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >> Taking a closer look at it, I have some concerns that I added as comments. >> HTTP has semantics for a reason. If QuicTransport is going to start >> borrowing HTTP piecemeal, I really wonder how simple people might feel it >> is. I think it's important to avoid something that looks like HTTP but >> behaves differently. Is it really much of a stretch to just do HTTP/3 but >> give it a different ALPN so that we avoid problems related to >> cross-protocol pooling? >> >> Cheers, >> Lucas >> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > --0000000000002dcf3d05b438ce1b Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Hi Luke,

    On Mon, 16 No= v 2020, 12:26 Luke Curley, <kixel= ated@gmail.com> wrote:
    Just to clarify, when I say "QuicTransport is simpler= " I really mean "QuicTransport has greater interoperability"= . You can take any QUIC implementation (+ datagram extension) and add a thi= n layer to support QuicTransport. It's a nice layering of protocols and= it's something that I want to see in general as QUIC replaces TCP.

    Thanks for the clarification. I appreciate the sentiment. But given the= development of QUIC its kind of surprising that people would find it easie= r to identify an implementation that supports QUIC and datagram but does no= t support HTTP/3.

    Thr si= tuation for a more clean-room implementation is different, I agree. However= , by the time you've done all the hard stuff with QUIC, a very focused = HTTP/3 layer ends up quite thin too. You can ignore dynamic compression, se= rver push and extensibility points.

    I also see the current design being the thin end of the wedge. = The proposal I linked talks about HTTP-like header parsing. So its "ju= st" a thin layer to do some parsing. Then folks will probably want som= e want to tweak parameter, acontrol channel, a way to do graceful close, a = sprinkle of GREASE. To extrapolate forward, what would be the delta be betw= een some final product QuicTransport and HTTP/3. Too small a delta and we&#= 39;ve wasted years of effort.

    Cheers
    Lucas

    =


    On Mon, Nov 16, 2020 at 3:16 AM Lucas P= ardue <lucaspardue.24.7@gmail.com> wrote:
    Hi folks,=

    To follow up on one thread of discussion during I= ETF 109. To over simplify what we've heard a few folks say, they prefer= QuicTransport because it simpler and they don't need pooling.

    I'd like to push more on this, what is the measurable = complexity of HTTP/3 over QUIC plus a new application mapping that needs to= be defined? Let's isolate pooling as a variable and ignore it.

    Victor mentioned his proposal for a unified header semant= ic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview= /pull/4/files. Taking a closer look at it, I have some concerns that I = added as comments. HTTP has semantics for a reason. If QuicTransport is go= ing to start borrowing HTTP piecemeal, I really wonder how simple people mi= ght feel it is. I think it's important to avoid something that looks li= ke HTTP but behaves differently. Is it really much of a stretch to just do = HTTP/3 but give it a different ALPN so that we avoid problems related to cr= oss-protocol pooling?

    Cheers,
    Lucas
    <= /div>
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --0000000000002dcf3d05b438ce1b-- From nobody Mon Nov 16 11:33:03 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 883B83A0DD2 for ; Mon, 16 Nov 2020 11:32:55 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id gSGFdZxcflbf for ; Mon, 16 Nov 2020 11:32:53 -0800 (PST) Received: from mail-ot1-x335.google.com (mail-ot1-x335.google.com [IPv6:2607:f8b0:4864:20::335]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2DDB33A083F for ; Mon, 16 Nov 2020 11:32:51 -0800 (PST) Received: by mail-ot1-x335.google.com with SMTP id f16so17104989otl.11 for ; Mon, 16 Nov 2020 11:32:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=KQgW9fjd7wavUBlr0B72GwpDK0+IOZp4bWiXDZGaCb4=; b=I+upKgA+QulhgkVr+sr3bCi2jBZ3HJcG/jBrgdxRKs0F5fXVQRCxZXaj7FGmIgMr8x jCLpKzEqd6nOmh5DQ8mw/RKY5mIB29SBvZWKnX8/EbvueUIDjid6UbS7BkhUebuy6PQy c0/xAxatbevjgD17cMiIHI2NFjkY0mR/3QlpYhYqqxMy3nJ7O5vLksgkyvgFJkjCu0/R +66XDiS+oCtk5KdCs/lFOk8bn6+3VTWaxgRpx9P7kWh0b41UIkx//+ITVEYXQNg3BkGU v0jg3r/0cuxQkdePHHYthIbG7m77HD1bHMEKBEATqTAjAOMpAsxHHfSKAGxEHGf2NcMk 1wfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=KQgW9fjd7wavUBlr0B72GwpDK0+IOZp4bWiXDZGaCb4=; b=mvum0WAkdJoDoEAtpKC6lN8ZBiACAARBPfUA8D4U8+ZMR6hb4+sgO6zz+nvcs9IMS2 eGhzKhjpnCnwcOxmBIVLBw+ew/bIa4Hf0MsaFoH5yWFZhMRhKzkf6D+00oQelU12Mpvi 1g6+D/khCChf+0yG4BGxdQdgg9IUjTflicV91oXlTEwzVIGZCPY2fgTpNPAwPBeL5BWV PpR/Y/qLpcPlkdI9rohQB5tcpTgfKp+onjGqD+xhiBvLBj5xynUMMF+fESS8c2cME/F4 0cUhYPpN/nIg+hQN6PH9Xplwj88UH5Uat7I2MaYPCvtpbS05yT/j2dLWc2dYhSGdPZEH 86CQ== X-Gm-Message-State: AOAM531VCmWQDiED+0OBzADBaNbLX8JtuKNdMsHT8TNm+3MR+Nw7OtgR T77zQcjQ9qieV6a7lReBrHSpKpy1M6Xl7YkxA3k= X-Google-Smtp-Source: ABdhPJzdOdULTk0XGmF7MJ1iXWVAiPDulHDR/4voKxMEBAxePqAQ9j5Yt339CUKug6TTk4IUYT+6E4N91qzjVNGtOzM= X-Received: by 2002:a9d:5e14:: with SMTP id d20mr576440oti.107.1605555170433; Mon, 16 Nov 2020 11:32:50 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Luke Curley Date: Mon, 16 Nov 2020 11:32:41 -0800 Message-ID: To: Lucas Pardue Cc: WebTransport Content-Type: multipart/alternative; boundary="00000000000099dc5105b43e7110" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 19:33:02 -0000 --00000000000099dc5105b43e7110 Content-Type: text/plain; charset="UTF-8" We're on the same page that there's code in HTTP/3 that could be leveraged for QuicTransport in the form of the header parsing. I think there's a path to merge QuicTransport and Http3Transport by leveraging HTTP/3 for the handshake and QUIC for stream delivery. My primary concern is that Http3Transport requires non-generic modifications to the HTTP/3 layer mostly to support connection pooling. I'm worried that this will limit support for Http3Transport and complicates any HTTP/3 implementation that does support it. On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue wrote: > Hi Luke, > > On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: > >> Just to clarify, when I say "QuicTransport is simpler" I really mean >> "QuicTransport has greater interoperability". You can take any QUIC >> implementation (+ datagram extension) and add a thin layer to support >> QuicTransport. It's a nice layering of protocols and it's something that I >> want to see in general as QUIC replaces TCP. >> > > Thanks for the clarification. I appreciate the sentiment. But given the > development of QUIC its kind of surprising that people would find it easier > to identify an implementation that supports QUIC and datagram but does not > support HTTP/3. > > Thr situation for a more clean-room implementation is different, I agree. > However, by the time you've done all the hard stuff with QUIC, a very > focused HTTP/3 layer ends up quite thin too. You can ignore dynamic > compression, server push and extensibility points. > > I also see the current design being the thin end of the wedge. The > proposal I linked talks about HTTP-like header parsing. So its "just" a > thin layer to do some parsing. Then folks will probably want some want to > tweak parameter, acontrol channel, a way to do graceful close, a sprinkle > of GREASE. To extrapolate forward, what would be the delta be between some > final product QuicTransport and HTTP/3. Too small a delta and we've wasted > years of effort. > > Cheers > Lucas > > > >> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue >> wrote: >> >>> Hi folks, >>> >>> To follow up on one thread of discussion during IETF 109. To over >>> simplify what we've heard a few folks say, they prefer QuicTransport >>> because it simpler and they don't need pooling. >>> >>> I'd like to push more on this, what is the measurable complexity of >>> HTTP/3 over QUIC plus a new application mapping that needs to be defined? >>> Let's isolate pooling as a variable and ignore it. >>> >>> Victor mentioned his proposal for a unified header semantic across all >>> transports, this is >>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>> Taking a closer look at it, I have some concerns that I added as comments. >>> HTTP has semantics for a reason. If QuicTransport is going to start >>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>> is. I think it's important to avoid something that looks like HTTP but >>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>> give it a different ALPN so that we avoid problems related to >>> cross-protocol pooling? >>> >>> Cheers, >>> Lucas >>> -- >>> Webtransport mailing list >>> Webtransport@ietf.org >>> https://www.ietf.org/mailman/listinfo/webtransport >>> >> --00000000000099dc5105b43e7110 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    We're on the same page that there's code in HTTP/3= that could be leveraged for QuicTransport in the form of the header parsin= g. I think there's a path to merge QuicTransport and Http3Transport by = leveraging HTTP/3 for the handshake and QUIC for stream delivery.

    <= /div>
    My primary concern is that Http3Transport requires non-generic mo= difications to the HTTP/3 layer mostly to support connection pooling. I'= ;m worried that this will limit support for Http3Transport and complicates = any HTTP/3 implementation that does support it.

    On Mon, Nov 16, 2020= at 4:49 AM Lucas Pardue <= lucaspardue.24.7@gmail.com> wrote:
    Hi Luke,

    On Mon, 16 Nov 2020, 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    =
    Just to clarify, when I say "QuicTransport is simpler" I rea= lly mean "QuicTransport has greater interoperability". You can ta= ke any QUIC implementation (+ datagram extension) and add a thin layer to s= upport QuicTransport. It's a nice layering of protocols and it's so= mething that I want to see in general as QUIC replaces TCP.

    Thanks f= or the clarification. I appreciate the sentiment. But given the development= of QUIC its kind of surprising that people would find it easier to identif= y an implementation that supports QUIC and datagram but does not support HT= TP/3.

    Thr situation for = a more clean-room implementation is different, I agree. However, by the tim= e you've done all the hard stuff with QUIC, a very focused HTTP/3 layer= ends up quite thin too. You can ignore dynamic compression, server push an= d extensibility points.

    = I also see the current design being the thin end of the wedge. The proposal= I linked talks about HTTP-like header parsing. So its "just" a t= hin layer to do some parsing. Then folks will probably want some want to tw= eak parameter, acontrol channel, a way to do graceful close, a sprinkle of = GREASE. To extrapolate forward, what would be the delta be between some fin= al product QuicTransport and HTTP/3. Too small a delta and we've wasted= years of effort.

    Cheers=
    Lucas


    <= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
    On Mon, Nov 16, 2020 at 3:16 AM = Lucas Pardue <lucaspardue.24.7@gmail.com> wrote:
    Hi= folks,

    To follow up on one thread of discussion d= uring IETF 109. To over simplify what we've heard a few folks say, they= prefer QuicTransport because it simpler and they don't need pooling.

    I'd like to push more on this, what is the meas= urable complexity of HTTP/3 over QUIC plus a new application mapping that n= eeds to be defined? Let's isolate pooling as a variable and ignore it.<= /div>

    Victor mentioned his proposal for a unified header= semantic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-o= verview/pull/4/files. Taking a closer look at it, I have some concerns = that I added as comments. HTTP has semantics for a reason. If QuicTranspor= t is going to start borrowing HTTP piecemeal, I really wonder how simple pe= ople might feel it is. I think it's important to avoid something that l= ooks like HTTP but behaves differently. Is it really much of a stretch to j= ust do HTTP/3 but give it a different ALPN so that we avoid problems relate= d to cross-protocol pooling?

    Cheers,
    Luc= as
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --00000000000099dc5105b43e7110-- From nobody Mon Nov 16 11:37:51 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 222803A07F0 for ; Mon, 16 Nov 2020 11:37:50 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id k5CPNuaXNs-L for ; Mon, 16 Nov 2020 11:37:48 -0800 (PST) Received: from mail-lf1-x12d.google.com (mail-lf1-x12d.google.com [IPv6:2a00:1450:4864:20::12d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 2285B3A07D3 for ; Mon, 16 Nov 2020 11:37:48 -0800 (PST) Received: by mail-lf1-x12d.google.com with SMTP id d17so26762743lfq.10 for ; Mon, 16 Nov 2020 11:37:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=X9MV3CFXN8nNK9lcuLRJbrsJz3zqpHXPCBH2bniorsA=; b=QeRgUwsBst6GY6V43+W5BJi7VatgV5A3OcQ00N3DtqolXzYec8PfabTDWCrHLmOF09 Ut/L07BX58NPckif9BL/YwAMtmly9ol++wE1nkbqbmTJfHSAh0u5I7nDuHvgQcdV6EB2 vCCOM+gtXHfGju4xCvwl6Af4q/G/JKnGEA+9mb6iOHIZkv0G/Y+c0RLl7BAcBF3SiqDB OrIk/jGDkNPwdzhBl/nQwbp0mUX+VkM4XUBWUcOSfZCG+T1bGPHqt2qQvc0900mUIS/Q p9upxunQqaKc9brjlqkDJkDefUOdyGdVYqnrS38uuj+AiBjJV3qFVJSoYKEJZ7m3jblH PmIA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=X9MV3CFXN8nNK9lcuLRJbrsJz3zqpHXPCBH2bniorsA=; b=GJYS5nFmC/0Ml6+/GOtHFNChROuTQ/wYa/5pVnqHixrD4KRgRbhDGPvHPH60+sclmG m/2DHcCw4EOVDz4S4hr6i2EFqjERhJNcnL47u7bpenD1p84FvbPLenAwcdGya5Dc4kgo lHhNN1jhYYJDzH451zlks2pf9Qd+U0X78W8hlA684ntik3VhHIbfTn2dKau+hwuDbzFF oeKBYtjj86rFHYkUdNT5pH48iirhyqZ5fYa61r7aX1SyzhajJAlCURpA750EXez0WpJV 9ELQbWhr7MfNMuBB7gw+UYqbDN9tm8ajmuYM6b7dZnssaE6sOy6P3EE70JseEe/J71dh o+kQ== X-Gm-Message-State: AOAM530hxnIT241czcyvjJn615uPpo7WG9TrqsNklJRhsnJaHcw8eWUn hOlrK1+zId7U4GPZUgvGFUTvCtfbtRQzGwecGas= X-Google-Smtp-Source: ABdhPJyG3CaraNgsxMxjTuqkwA5gkudhsMPmGnTYy6wq5Sg4uccfLcgWFNfgP+blaVh2Bw4b7SSJ5pdYqlHAmBtQHPU= X-Received: by 2002:a19:ec09:: with SMTP id b9mr383894lfa.178.1605555466213; Mon, 16 Nov 2020 11:37:46 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: David Schinazi Date: Mon, 16 Nov 2020 11:37:35 -0800 Message-ID: To: Luke Curley Cc: Lucas Pardue , WebTransport Content-Type: multipart/alternative; boundary="0000000000003b1f5405b43e8391" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 19:37:50 -0000 --0000000000003b1f5405b43e8391 Content-Type: text/plain; charset="UTF-8" On Mon, Nov 16, 2020 at 11:34 AM Luke Curley wrote: > We're on the same page that there's code in HTTP/3 that could be leveraged > for QuicTransport in the form of the header parsing. I think there's a path > to merge QuicTransport and Http3Transport by leveraging HTTP/3 for the > handshake and QUIC for stream delivery. > > My primary concern is that Http3Transport requires non-generic > modifications to the HTTP/3 layer mostly to support connection pooling. I'm > worried that this will limit support for Http3Transport and complicates any > HTTP/3 implementation that does support it. > Hi Luke, I'm curious, could you elaborate on what these "non-generic modifications to the HTTP/3 layer" are please? Thanks, David > On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue > wrote: > >> Hi Luke, >> >> On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: >> >>> Just to clarify, when I say "QuicTransport is simpler" I really mean >>> "QuicTransport has greater interoperability". You can take any QUIC >>> implementation (+ datagram extension) and add a thin layer to support >>> QuicTransport. It's a nice layering of protocols and it's something that I >>> want to see in general as QUIC replaces TCP. >>> >> >> Thanks for the clarification. I appreciate the sentiment. But given the >> development of QUIC its kind of surprising that people would find it easier >> to identify an implementation that supports QUIC and datagram but does not >> support HTTP/3. >> >> Thr situation for a more clean-room implementation is different, I agree. >> However, by the time you've done all the hard stuff with QUIC, a very >> focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >> compression, server push and extensibility points. >> >> I also see the current design being the thin end of the wedge. The >> proposal I linked talks about HTTP-like header parsing. So its "just" a >> thin layer to do some parsing. Then folks will probably want some want to >> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >> of GREASE. To extrapolate forward, what would be the delta be between some >> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >> years of effort. >> >> Cheers >> Lucas >> >> >> >>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue >>> wrote: >>> >>>> Hi folks, >>>> >>>> To follow up on one thread of discussion during IETF 109. To over >>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>> because it simpler and they don't need pooling. >>>> >>>> I'd like to push more on this, what is the measurable complexity of >>>> HTTP/3 over QUIC plus a new application mapping that needs to be defined? >>>> Let's isolate pooling as a variable and ignore it. >>>> >>>> Victor mentioned his proposal for a unified header semantic across all >>>> transports, this is >>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>> Taking a closer look at it, I have some concerns that I added as comments. >>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>> is. I think it's important to avoid something that looks like HTTP but >>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>> give it a different ALPN so that we avoid problems related to >>>> cross-protocol pooling? >>>> >>>> Cheers, >>>> Lucas >>>> -- >>>> Webtransport mailing list >>>> Webtransport@ietf.org >>>> https://www.ietf.org/mailman/listinfo/webtransport >>>> >>> -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --0000000000003b1f5405b43e8391 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


    =
    On Mon, Nov 16, 2020 at 11:34 AM Luke= Curley <kixelated@gmail.com&= gt; wrote:
    We're on the same page that there's code in HTTP/3 that= could be leveraged for QuicTransport in the form of the header parsing. I = think there's a path to merge QuicTransport and Http3Transport by lever= aging HTTP/3 for the handshake and QUIC for stream delivery.

    =
    My primary concern is that Http3Transport requires non-generic modific= ations to the HTTP/3 layer mostly to support connection pooling. I'm wo= rried that this will limit support for Http3Transport and complicates any H= TTP/3 implementation that does support it.
    Hi Luke,

    I'm curious, could you el= aborate on what these "non-generic modifications to the HTTP/3 layer&q= uot; are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020= at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com> wrote:
    Hi Luke,=

    On Mon, 16 Nov 2020, 12:26 Luke Curley, <= kixelated@gmail.co= m> wrote:
    Just to clarify, when I say "QuicTransport is s= impler" I really mean "QuicTransport has greater interoperability= ". You can take any QUIC implementation (+ datagram extension) and add= a thin layer to support QuicTransport. It's a nice layering of protoco= ls and it's something that I want to see in general as QUIC replaces TC= P.

    Thanks for the clarification. I appreciate the sentiment. But giv= en the development of QUIC its kind of surprising that people would find it= easier to identify an implementation that supports QUIC and datagram but d= oes not support HTTP/3.

    = Thr situation for a more clean-room implementation is different, I agree. H= owever, by the time you've done all the hard stuff with QUIC, a very fo= cused HTTP/3 layer ends up quite thin too. You can ignore dynamic compressi= on, server push and extensibility points.

    =
    I also see the current design being the thin end of the w= edge. The proposal I linked talks about HTTP-like header parsing. So its &q= uot;just" a thin layer to do some parsing. Then folks will probably wa= nt some want to tweak parameter, acontrol channel, a way to do graceful clo= se, a sprinkle of GREASE. To extrapolate forward, what would be the delta b= e between some final product QuicTransport and HTTP/3. Too small a delta an= d we've wasted years of effort.

    Cheers
    Lucas

    =


    On Mon, Nov 16= , 2020 at 3:16 AM Lucas Pardue <lucaspardue.24.7@gmail.com&g= t; wrote:
    Hi folks,

    To follow up on one thre= ad of discussion during IETF 109. To over simplify what we've heard a f= ew folks say, they prefer QuicTransport because it simpler and they don'= ;t need pooling.

    I'd like to push more on this= , what is the measurable complexity of HTTP/3 over QUIC plus a new applicat= ion mapping that needs to be defined? Let's isolate pooling as a variab= le and ignore it.

    Victor mentioned his proposal fo= r a unified header semantic across all transports, this is https://github.com/ietf-wg-webtrans/dra= ft-ietf-webtrans-overview/pull/4/files. Taking a closer look at it, I h= ave some concerns that I added as comments. HTTP has semantics for a reaso= n. If QuicTransport is going to start borrowing HTTP piecemeal, I really wo= nder how simple people might feel it is. I think it's important to avoi= d something that looks like HTTP but behaves differently. Is it really much= of a stretch to just do HTTP/3 but give it a different ALPN so that we avo= id problems related to cross-protocol pooling?

    Che= ers,
    Lucas
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --0000000000003b1f5405b43e8391-- From nobody Mon Nov 16 12:06:14 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6AC513A0138 for ; Mon, 16 Nov 2020 12:06:12 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.848 X-Spam-Level: X-Spam-Status: No, score=-1.848 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 2V9aacknqgBf for ; Mon, 16 Nov 2020 12:06:10 -0800 (PST) Received: from mail-ed1-x52d.google.com (mail-ed1-x52d.google.com [IPv6:2a00:1450:4864:20::52d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F23073A163A for ; Mon, 16 Nov 2020 12:05:33 -0800 (PST) Received: by mail-ed1-x52d.google.com with SMTP id d18so7129680edt.7 for ; Mon, 16 Nov 2020 12:05:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=pEi0h0PxZ+3WgWzzF8cUhdz3H8U3iJsgH00I48FoNKA=; b=EYzBGEXO3bCXpt5Uz69ESVUZr+KIYHkwcC7JXo40RLMaBHcQYvGPPfZZdDl3qtgIGx sTaZ0Xdp8o4LKniM4dErqdU620Kb+LPn1FEghxEVYLyhPmjEgPU2Rkq8PZbrtooVWqs0 oz1LVi/+5o81ZJ9KTU+4uJ/vpUpnCIYWnQxper1//SlZjjYP03LLG4WB69tn2VfQNHUW D/DQYNOtYBMx5JdDicsu4jTgDDNzL2UIwATgA5hDD5UlQtBxluqynZ86KmvU4sZ77I3E t9kK1kwR8tuWCtbg0ySzOC1kiOGdd4l8u2ty+oR61zLehVxKbN50cHfQzKZ6qMBtOQHn /BKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=pEi0h0PxZ+3WgWzzF8cUhdz3H8U3iJsgH00I48FoNKA=; b=nvle7oEa3NyzRr0xYKbWTbqw4vLwmkQdwF2L+9L44r4TXpmX/D5WAgNNB9I0u+mzG1 tgynfWj9Gd7Ff2bGJGL6dYVX+CD+w8qE+iQZQzl5XLKiUcYw/Hi5mHBbin1AI6EAfaU4 hT4U+uewRnRS4OoDlTEnyzV2MYFbNvbK84QQsuR5KHgUobYd5kBPHf/rDgyy1JJo0ajE UtL01H2yiu2moZJZRO+kjB1xCwEnqxSZp/H8x3CE8nt7RM9xZHJjqEIi2ydb8KAEBgZv vJJlX15cDJoZyPafmvghETsMT6pf6FPdTb3F8FgwP6YHUiKLDZiU/OkFIvfZDz14A+x/ WyKg== X-Gm-Message-State: AOAM533b8ef7NVQwc/4JcbUP9++BlAbH8QZ7y2306UCUEAih+QupAUb8 cPhHtDvSS0po13gvsjU8iSknmqQ6Cjb9KKvPYGZq5/tN X-Google-Smtp-Source: ABdhPJxSrelaSyIxBFnqav6jtutk6h2KYMla0Q+aXCyjcY/zB7926Ri4nvjfSot+84/9M3xVFTIbHMnUOSdHYi4/ta4= X-Received: by 2002:a50:f40a:: with SMTP id r10mr17341273edm.229.1605557132195; Mon, 16 Nov 2020 12:05:32 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Lucas Pardue Date: Mon, 16 Nov 2020 20:05:22 +0000 Message-ID: To: David Schinazi Cc: Luke Curley , WebTransport Content-Type: multipart/alternative; boundary="00000000000087fc8e05b43ee6e8" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 20:06:12 -0000 --00000000000087fc8e05b43ee6e8 Content-Type: text/plain; charset="UTF-8" On Mon, 16 Nov 2020, 19:37 David Schinazi, wrote: > > Hi Luke, > > I'm curious, could you elaborate on what these "non-generic modifications > to the HTTP/3 layer" are please? > Yeah this is what I'm trying to figure out. If we just declare pooling as nice to have but too hard to deploy, then does Http3Transport become a bit more straightforward to implement? I'll note that some of the HTTP/3 implementation in familiar with punt the problem of HTTP semantics to a different part of the code. So the application-mapping layer is really quite minimal. Cheers Lucas --00000000000087fc8e05b43ee6e8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


    On Mon, 16 Nov 2020, 19:37 David Schinazi, &l= t;dschinazi.ietf@gmail.com&= gt; wrote:

    Hi Luke,

    I= 9;m curious, could you elaborate on what these "non-generic modificati= ons to the HTTP/3 layer" are please?

    Yeah this is wh= at I'm trying to figure out. If we just declare pooling as nice to have= but too hard to deploy, then does Http3Transport become a bit more straigh= tforward to implement?

    I= 'll note that some of the HTTP/3 implementation in familiar with punt t= he problem of HTTP semantics to a different part of the code. So the applic= ation-mapping layer is really quite minimal.

    Cheers=C2=A0
    Lucas
    --00000000000087fc8e05b43ee6e8-- From nobody Mon Nov 16 12:33:46 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 053823A13D1 for ; Mon, 16 Nov 2020 12:33:45 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pwSPGsbTlXpD for ; Mon, 16 Nov 2020 12:33:42 -0800 (PST) Received: from mail-ot1-x335.google.com (mail-ot1-x335.google.com [IPv6:2607:f8b0:4864:20::335]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6AA973A09C0 for ; Mon, 16 Nov 2020 12:33:42 -0800 (PST) Received: by mail-ot1-x335.google.com with SMTP id i18so17339158ots.0 for ; Mon, 16 Nov 2020 12:33:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=+o5HV/hDq2YlPBj7IaK63Of+lXSd6G6RtKjFtRokrPc=; b=EadYUn3z6JALhxKXZFOXx+qLSYUpA+Q4z2t6e1Vz6+ulZR9NJWZS1svxHn7Vk7Yk1a GKa4eer4q/QelijV08pxH7boNf/rSKKn4PGANv+Yshzf3uCuWeK5f4ea3Mc2bEC6Vb0O ACDvlRhb8oC3+lu9K4vvXCj1qBDvYHqQcG5rwwUx1AOybiTLjGoTufOz7tS2ZO+Vho7q 7sv/iW2M1/R+WtuHJt0vvhJTiE22FY0VpbTR30TxI8lgh2XOG8JK0sJPwl9DvIVmB5Bg HuaFyggnUQvbLehxgbVzRJE/f4aJYeOkko3Ps8BpXMwSRx114ebr/JAKIvXJ9JmbgZQv BcVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=+o5HV/hDq2YlPBj7IaK63Of+lXSd6G6RtKjFtRokrPc=; b=mRDPr0FWdPVzSXD4mdpbqHrn4L5BSaDzD0pql1hP1631ha9FL5W1IYv9pxLGCStJyd Hc2Xdlc4MvkJl4gkewAQl3oy9HK9E/eudBEpWRZIaSymbtxsZOfRfiXuHDUu0gaqMB4K qIS0DyBBUIHN9/JonLQXVOHXbwMlP21xsbKSz2A1Kl3mIe6wJk2AvFkFOkZzDzM+TnBT VSXVfLlKDUhbPJ095pdfRpQVTfJpTtxvmkKshaBi9nbhTrnASQEdSOy7gaJyVp+KNOV7 Symr6s79giVd+vkVahE2Fafr7tty0YQ6fUC4BLYhUs99X0hFRDfc36smgg75Aw72171W ZUHQ== X-Gm-Message-State: AOAM5318D/T8O46lk2izvP4RLVmQrzQMPMCI1Ra7MJ5uAouef1impTNy XTAoPmpOyV96tBaJOWoMegKAwTlmAamfs+zXmKE= X-Google-Smtp-Source: ABdhPJwc59NsCfwMYdN3jxqs2zfzimBiDcV+sKI3Mw8Tj5NFZmE6vaFmVzUOPbHQhYZrtRas8jdIO+agIrqLA+R38Os= X-Received: by 2002:a9d:6f90:: with SMTP id h16mr843360otq.35.1605558821559; Mon, 16 Nov 2020 12:33:41 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Luke Curley Date: Mon, 16 Nov 2020 12:33:32 -0800 Message-ID: To: David Schinazi Cc: Lucas Pardue , WebTransport Content-Type: multipart/alternative; boundary="00000000000039a22705b43f4ba7" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 20:33:45 -0000 --00000000000039a22705b43f4ba7 Content-Type: text/plain; charset="UTF-8" I'll concede that "non-generic" is not a fair description and what I should have said is "web transport specific". That being said, the current Http3Transport draft is fairly easy to implement and I don't think that it poses a significant barrier for adoption. I think my problem is that I'm extrapolating the Http3Transport design in my head to deal with other issues. Let me file those issues to see if they make sense and how they could be resolved instead of jumping to conclusions. On Mon, Nov 16, 2020 at 11:37 AM David Schinazi wrote: > > > On Mon, Nov 16, 2020 at 11:34 AM Luke Curley wrote: > >> We're on the same page that there's code in HTTP/3 that could be >> leveraged for QuicTransport in the form of the header parsing. I think >> there's a path to merge QuicTransport and Http3Transport by leveraging >> HTTP/3 for the handshake and QUIC for stream delivery. >> >> My primary concern is that Http3Transport requires non-generic >> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >> worried that this will limit support for Http3Transport and complicates any >> HTTP/3 implementation that does support it. >> > > Hi Luke, > > I'm curious, could you elaborate on what these "non-generic modifications > to the HTTP/3 layer" are please? > > Thanks, > David > > >> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue >> wrote: >> >>> Hi Luke, >>> >>> On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: >>> >>>> Just to clarify, when I say "QuicTransport is simpler" I really mean >>>> "QuicTransport has greater interoperability". You can take any QUIC >>>> implementation (+ datagram extension) and add a thin layer to support >>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>> want to see in general as QUIC replaces TCP. >>>> >>> >>> Thanks for the clarification. I appreciate the sentiment. But given the >>> development of QUIC its kind of surprising that people would find it easier >>> to identify an implementation that supports QUIC and datagram but does not >>> support HTTP/3. >>> >>> Thr situation for a more clean-room implementation is different, I >>> agree. However, by the time you've done all the hard stuff with QUIC, a >>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>> compression, server push and extensibility points. >>> >>> I also see the current design being the thin end of the wedge. The >>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>> thin layer to do some parsing. Then folks will probably want some want to >>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>> of GREASE. To extrapolate forward, what would be the delta be between some >>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>> years of effort. >>> >>> Cheers >>> Lucas >>> >>> >>> >>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>> lucaspardue.24.7@gmail.com> wrote: >>>> >>>>> Hi folks, >>>>> >>>>> To follow up on one thread of discussion during IETF 109. To over >>>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>>> because it simpler and they don't need pooling. >>>>> >>>>> I'd like to push more on this, what is the measurable complexity of >>>>> HTTP/3 over QUIC plus a new application mapping that needs to be defined? >>>>> Let's isolate pooling as a variable and ignore it. >>>>> >>>>> Victor mentioned his proposal for a unified header semantic across all >>>>> transports, this is >>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>> is. I think it's important to avoid something that looks like HTTP but >>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>> give it a different ALPN so that we avoid problems related to >>>>> cross-protocol pooling? >>>>> >>>>> Cheers, >>>>> Lucas >>>>> -- >>>>> Webtransport mailing list >>>>> Webtransport@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>> >>>> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > --00000000000039a22705b43f4ba7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    I'll concede that "non-generic" is not = a fair description and what I should have said is "web transport speci= fic". That being said, the current Http3Transport draft is fairly easy= to implement and I don't think that it poses a significant barrier for= adoption.

    I think my problem is that I'm extr= apolating the Http3Transport design in my head to deal with other issues. L= et me file those issues to see if they make sense and how they could be res= olved instead of jumping to conclusions.
    <= br>
    On Mon,= Nov 16, 2020 at 11:37 AM David Schinazi <dschinazi.ietf@gmail.com> wrote:

    On Mon, Nov 16, 2020 at 11:34 AM Luke Curley <kixelated@gmail.com> wrote:
    We'= re on the same page that there's code in HTTP/3 that could be leveraged= for QuicTransport in the form of the header parsing. I think there's a= path to merge QuicTransport and Http3Transport by leveraging HTTP/3 for th= e handshake and QUIC for stream delivery.

    My primary con= cern is that Http3Transport requires non-generic modifications to the HTTP/= 3 layer mostly to support connection pooling. I'm worried that this wil= l limit support for Http3Transport and complicates any HTTP/3 implementatio= n that does support it.

    Hi Luke= ,

    I'm curious, could you elaborate on what the= se "non-generic modifications to the HTTP/3 layer" are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Par= due <luc= aspardue.24.7@gmail.com> wrote:
    Hi Luke,

    On Mon, 16 Nov 2020, 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    <= /div>
    Just to clarify, when I say "QuicTransport is simpler" I really= mean "QuicTransport has greater interoperability". You can take = any QUIC implementation (+ datagram extension) and add a thin layer to supp= ort QuicTransport. It's a nice layering of protocols and it's somet= hing that I want to see in general as QUIC replaces TCP.

    Thanks for = the clarification. I appreciate the sentiment. But given the development of= QUIC its kind of surprising that people would find it easier to identify a= n implementation that supports QUIC and datagram but does not support HTTP/= 3.

    Thr situation for a m= ore clean-room implementation is different, I agree. However, by the time y= ou've done all the hard stuff with QUIC, a very focused HTTP/3 layer en= ds up quite thin too. You can ignore dynamic compression, server push and e= xtensibility points.

    I a= lso see the current design being the thin end of the wedge. The proposal I = linked talks about HTTP-like header parsing. So its "just" a thin= layer to do some parsing. Then folks will probably want some want to tweak= parameter, acontrol channel, a way to do graceful close, a sprinkle of GRE= ASE. To extrapolate forward, what would be the delta be between some final = product QuicTransport and HTTP/3. Too small a delta and we've wasted ye= ars of effort.

    Cheers
    Lucas



    On Mon, Nov 16, 2020 at 3:16 AM Luc= as Pardue <lucaspardue.24.7@gmail.com> wrote:
    Hi fo= lks,

    To follow up on one thread of discussion duri= ng IETF 109. To over simplify what we've heard a few folks say, they pr= efer QuicTransport because it simpler and they don't need pooling.

    I'd like to push more on this, what is the measura= ble complexity of HTTP/3 over QUIC plus a new application mapping that need= s to be defined? Let's isolate pooling as a variable and ignore it.

    Victor mentioned his proposal for a unified header se= mantic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-over= view/pull/4/files. Taking a closer look at it, I have some concerns tha= t I added as comments. HTTP has semantics for a reason. If QuicTransport i= s going to start borrowing HTTP piecemeal, I really wonder how simple peopl= e might feel it is. I think it's important to avoid something that look= s like HTTP but behaves differently. Is it really much of a stretch to just= do HTTP/3 but give it a different ALPN so that we avoid problems related t= o cross-protocol pooling?

    Cheers,
    Lucas<= br>
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --00000000000039a22705b43f4ba7-- From nobody Mon Nov 16 12:40:38 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 057B73A13F7 for ; Mon, 16 Nov 2020 12:40:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5UeJqUKJaYNl for ; Mon, 16 Nov 2020 12:40:34 -0800 (PST) Received: from mail-lf1-x12e.google.com (mail-lf1-x12e.google.com [IPv6:2a00:1450:4864:20::12e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 796A23A13F3 for ; Mon, 16 Nov 2020 12:40:34 -0800 (PST) Received: by mail-lf1-x12e.google.com with SMTP id z21so26989887lfe.12 for ; Mon, 16 Nov 2020 12:40:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=qV8kUCaBXsUw27/d6EcsHVZlqt8lbJ+z9NdgdBcNYRI=; b=ollvX+XAHQi5/7QRk21iBBKY9BpAvSMN4cU7f29pDru7k9bVm+gdnvxDzg6lYdL1Yl jl+084olxfA5bvqCA5eIB4w3RIrjXJku+T/3D0gvVpVzUFI11C4aiQq5hW4LXwTaxIIT 1ki3Frx7PVkpKETuJ4ZHf1gCGIAhuo9XSp2pJwxg/Ep+E/3G/JsU3ChIWBkN5Uflqc0r WMDzbovbzUMhziMFzMiy5XciskclZc/dKSo1S3gU510mpXkNcVI/WlRYFDhcKEXs/rgn YLTlbujaqFjGLe/LAT+8qBtwBS/1yNrQpTqFIlmF8U78XBz7C1aWExNXRhPLP5YUX206 PwFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=qV8kUCaBXsUw27/d6EcsHVZlqt8lbJ+z9NdgdBcNYRI=; b=j9710Q25JZ771bPMpWzhCdnb1+gJ4SNZE4j+bX3jmGB61ipYT7kGKBS20NXjJ8N7Bx zf9yvzLc/QWWlgvFPMMS2xGH/trNgn//lkLFJcrQFxEwRSbemOiaN44bYrMvnMIDecqA VtcOMqDWqWoSdtoIf6Rx9pB5BuoWIDGmsvlGERVRNY+7kK4PDVDSJEoSGwhh+CwVPpJv IriMbbBmo31jVPIhT8wpyoMBeMvrGV0/bpzVHEZKoQW++Iu1DuHHgR4Z4v0mwkqFIvnN BM9fCQ8qgZexyl4+fgf6NY5jFTbsClE6Upucqu6m4Sv/n7EluaRc/2zVTAZek8iKMOST Clhg== X-Gm-Message-State: AOAM531YInQEnQLdim3CULkNK5s/MZqOwrluOfqrYhd/egSQkPvzHzss iRgAupnFAtEF/5C6eN7ok3TYZ462NOAq0eAXkjuDOoF+3zc= X-Google-Smtp-Source: ABdhPJwx6beqMX3zLO/IQI0wQ5iPKrHLmVFvPsrjW57ktwmcg70C8JyVHf3KfB0aBon4cT6y9iCZNIO1KddoiVRBNUQ= X-Received: by 2002:a19:6005:: with SMTP id u5mr385433lfb.367.1605559232394; Mon, 16 Nov 2020 12:40:32 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Bernard Aboba Date: Mon, 16 Nov 2020 12:40:22 -0800 Message-ID: To: David Schinazi Cc: Luke Curley , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="000000000000b6785405b43f63a8" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 20:40:37 -0000 --000000000000b6785405b43f63a8 Content-Type: text/plain; charset="UTF-8" Luke said: "My primary concern is that Http3Transport requires non-generic modifications to the HTTP/3 layer mostly to support connection pooling. I'm worried that this will limit support for Http3Transport and complicates any HTTP/3 implementation that does support it." [BA] I have also heard this concern from developers. The concerns primarily arise from the pooling of HTTP/3 Request/Responses with WebTransport. This does enable some interesting use cases, such as a Request/Response (e.g. gRPC) that can result in a server sending datagrams or initiating bi-directional or uni-directional streams. So there is perceived value, but the question is whether that value will be widely supported across the HTTP/3 ecosystem. At this point, most generic HTTP/3 servers are not expected to support HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport (perceived as a niche protocol), so that pooling would only be possible when using a framework. node.js will not have QUIC support for 12-18 months (held up by OpenSSL) so even framework support is expected to be limited. On Mon, Nov 16, 2020 at 11:37 AM David Schinazi wrote: > > > On Mon, Nov 16, 2020 at 11:34 AM Luke Curley wrote: > >> We're on the same page that there's code in HTTP/3 that could be >> leveraged for QuicTransport in the form of the header parsing. I think >> there's a path to merge QuicTransport and Http3Transport by leveraging >> HTTP/3 for the handshake and QUIC for stream delivery. >> >> My primary concern is that Http3Transport requires non-generic >> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >> worried that this will limit support for Http3Transport and complicates any >> HTTP/3 implementation that does support it. >> > > Hi Luke, > > I'm curious, could you elaborate on what these "non-generic modifications > to the HTTP/3 layer" are please? > > Thanks, > David > > >> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue >> wrote: >> >>> Hi Luke, >>> >>> On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: >>> >>>> Just to clarify, when I say "QuicTransport is simpler" I really mean >>>> "QuicTransport has greater interoperability". You can take any QUIC >>>> implementation (+ datagram extension) and add a thin layer to support >>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>> want to see in general as QUIC replaces TCP. >>>> >>> >>> Thanks for the clarification. I appreciate the sentiment. But given the >>> development of QUIC its kind of surprising that people would find it easier >>> to identify an implementation that supports QUIC and datagram but does not >>> support HTTP/3. >>> >>> Thr situation for a more clean-room implementation is different, I >>> agree. However, by the time you've done all the hard stuff with QUIC, a >>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>> compression, server push and extensibility points. >>> >>> I also see the current design being the thin end of the wedge. The >>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>> thin layer to do some parsing. Then folks will probably want some want to >>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>> of GREASE. To extrapolate forward, what would be the delta be between some >>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>> years of effort. >>> >>> Cheers >>> Lucas >>> >>> >>> >>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>> lucaspardue.24.7@gmail.com> wrote: >>>> >>>>> Hi folks, >>>>> >>>>> To follow up on one thread of discussion during IETF 109. To over >>>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>>> because it simpler and they don't need pooling. >>>>> >>>>> I'd like to push more on this, what is the measurable complexity of >>>>> HTTP/3 over QUIC plus a new application mapping that needs to be defined? >>>>> Let's isolate pooling as a variable and ignore it. >>>>> >>>>> Victor mentioned his proposal for a unified header semantic across all >>>>> transports, this is >>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>> is. I think it's important to avoid something that looks like HTTP but >>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>> give it a different ALPN so that we avoid problems related to >>>>> cross-protocol pooling? >>>>> >>>>> Cheers, >>>>> Lucas >>>>> -- >>>>> Webtransport mailing list >>>>> Webtransport@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>> >>>> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --000000000000b6785405b43f63a8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Luke said:=C2=A0

    "My primary concern is that Http3Transport requires non-g= eneric modifications to the HTTP/3 layer mostly to support connection pooli= ng. I'm worried that this will limit support for Http3Transport and com= plicates any HTTP/3 implementation that does support it."
    =

    [BA] I have also heard this concern from developers. Th= e concerns primarily arise from the pooling of HTTP/3 Request/Responses wit= h WebTransport. This does enable some interesting use cases, such as a Requ= est/Response (e.g. gRPC) that can result in a server sending datagrams or i= nitiating bi-directional or uni-directional streams.=C2=A0 So there is perc= eived value, but the question is whether that value will be widely supporte= d across the HTTP/3 ecosystem.=C2=A0

    At this point= , most generic HTTP/3 servers are not expected to support HTTP/3 datagrams = (not part of the HTTP/3 protocol) or Http3Transport (perceived as a niche p= rotocol), so that pooling would only be possible when using a framework.=C2= =A0 node.js will not have=C2=A0QUIC support for 12-18 months (held up by Op= enSSL) so even framework support is expected to be limited.

    =
    On Mon, No= v 16, 2020 at 11:37 AM David Schinazi <dschinazi.ietf@gmail.com> wrote:


    On= Mon, Nov 16, 2020 at 11:34 AM Luke Curley <kixelated@gmail.com> wrote:
    We're = on the same page that there's code in HTTP/3 that could be leveraged fo= r QuicTransport in the form of the header parsing. I think there's a pa= th to merge QuicTransport and Http3Transport by leveraging HTTP/3 for the h= andshake and QUIC for stream delivery.

    My primary concer= n is that Http3Transport requires non-generic modifications to the HTTP/3 l= ayer mostly to support connection pooling. I'm worried that this will l= imit support for Http3Transport and complicates any HTTP/3 implementation t= hat does support it.

    Hi Luke,

    I'm curious, could you elaborate on what these = "non-generic modifications to the HTTP/3 layer" are please?
    =

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue= <lucasp= ardue.24.7@gmail.com> wrote:
    Hi Luke,
    =
    On Mon, 16 Nov 2020, 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    J= ust to clarify, when I say "QuicTransport is simpler" I really me= an "QuicTransport has greater interoperability". You can take any= QUIC implementation (+ datagram extension) and add a thin layer to support= QuicTransport. It's a nice layering of protocols and it's somethin= g that I want to see in general as QUIC replaces TCP.

    Thanks for the= clarification. I appreciate the sentiment. But given the development of QU= IC its kind of surprising that people would find it easier to identify an i= mplementation that supports QUIC and datagram but does not support HTTP/3.<= /div>

    Thr situation for a more= clean-room implementation is different, I agree. However, by the time you&= #39;ve done all the hard stuff with QUIC, a very focused HTTP/3 layer ends = up quite thin too. You can ignore dynamic compression, server push and exte= nsibility points.

    I also= see the current design being the thin end of the wedge. The proposal I lin= ked talks about HTTP-like header parsing. So its "just" a thin la= yer to do some parsing. Then folks will probably want some want to tweak pa= rameter, acontrol channel, a way to do graceful close, a sprinkle of GREASE= . To extrapolate forward, what would be the delta be between some final pro= duct QuicTransport and HTTP/3. Too small a delta and we've wasted years= of effort.

    Cheers
    =
    Lucas

    =

    <= div dir=3D"ltr" class=3D"gmail_attr">On Mon, Nov 16, 2020 at 3:16 AM Lucas = Pardue <lucaspardue.24.7@gmail.com> wrote:
    Hi folks= ,

    To follow up on one thread of discussion during = IETF 109. To over simplify what we've heard a few folks say, they prefe= r QuicTransport because it simpler and they don't need pooling.

    I'd like to push more on this, what is the measurable= complexity of HTTP/3 over QUIC plus a new application mapping that needs t= o be defined? Let's isolate pooling as a variable and ignore it.
    <= div>
    Victor mentioned his proposal for a unified header seman= tic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overvie= w/pull/4/files. Taking a closer look at it, I have some concerns that I= added as comments. HTTP has semantics for a reason. If QuicTransport is g= oing to start borrowing HTTP piecemeal, I really wonder how simple people m= ight feel it is. I think it's important to avoid something that looks l= ike HTTP but behaves differently. Is it really much of a stretch to just do= HTTP/3 but give it a different ALPN so that we avoid problems related to c= ross-protocol pooling?

    Cheers,
    Lucas
    =
    --
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    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
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    https://www.ietf.org/mailman/listinfo/webtransport=
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    --000000000000b6785405b43f63a8-- From nobody Mon Nov 16 13:00:33 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BF1373A143B for ; Mon, 16 Nov 2020 13:00:31 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aT6rZ-yPW8QY for ; Mon, 16 Nov 2020 13:00:30 -0800 (PST) Received: from mail-lj1-x22d.google.com (mail-lj1-x22d.google.com [IPv6:2a00:1450:4864:20::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C18AF3A1439 for ; Mon, 16 Nov 2020 13:00:29 -0800 (PST) Received: by mail-lj1-x22d.google.com with SMTP id b17so21693070ljf.12 for ; Mon, 16 Nov 2020 13:00:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ILSlM2ka85uDajYJZUFP4xcxUwPTVI3eld+aMkQg3QI=; b=HJZDFpe6xL896EpD4axs5RgDN+maOW3Y/suK1XOvUmxIM36vweVx+yy7WCt2snNZ1D KkIjJxYYkrSarh3od2gXA/qGtgAFKZ2beh9ApHAcZC6ffvT/JVci2WUeys/kKIlkGuNe z71e9mY9RL2LmijK622hXscZrf28+n03tk8mJ4/LqPQ0Lr+VDWgsXN4sKWdd7DTxsGjl JbWpp8xXBy+PpSlrsdrYrelXuz/VArY/BbcWSRv60Wg2RyV0taAkSOD7d7q7rSDzlTW0 cZIj4fZEJpSb4b1rF3vvKyeu6K2xdY2sZUqkS+0vTK2G2zShddrYukFYuMGsVVKzuDiw w6Ug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ILSlM2ka85uDajYJZUFP4xcxUwPTVI3eld+aMkQg3QI=; b=UKD7K9yp4YrdXRU4dc4/hhnPIf+4YcjKQTG1k3x8Mh6bOSsNYFOkItNNxjDluGOTgx unKCXBxsyGGx+qjUpncGrOWrLUm24byCWbvPSEUvIn5bNk90IHBxr62tNbJXxG51D+2o kGWzFIRalt1P6rAXrwGSSjpkAyqYqttAUwGBprt53LcDHPlRhFCIU90zkQgkjQwagQ23 oY+TCNOkKVU4h6uWUsJ9ljepP+adCtrtCRjnIW6d0Qv2zywPzkw6SptFgl9RByHdsakF rislYXvHL5ftM+VJ+sEqUZnYFoAMcPunGJ5ndNz8bRil+mfWcxP9ivnJKsyCNpzd+Eii zmQg== X-Gm-Message-State: AOAM533LEwcBgOCqnxYZpvg/cp5cEkxA94WzllwH1SD7VSt0xhjCSntH oP+tsveY/ehLzIrz/8zWMgnf7vETUrwLhyFlcqQ= X-Google-Smtp-Source: ABdhPJyuTpar/a/K4KdfOQUCmBiC35WJFyYb0GacOzxbd+m2kuXVYubcmzzhXIKTbWvn1GaipFdju9qxNo+Bk8uRJaY= X-Received: by 2002:a05:651c:319:: with SMTP id a25mr477487ljp.333.1605560427664; Mon, 16 Nov 2020 13:00:27 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: David Schinazi Date: Mon, 16 Nov 2020 13:00:16 -0800 Message-ID: To: Bernard Aboba Cc: Luke Curley , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="000000000000f4dbb205b43faa31" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 21:00:32 -0000 --000000000000f4dbb205b43faa31 Content-Type: text/plain; charset="UTF-8" On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba wrote: > Luke said: > > "My primary concern is that Http3Transport requires non-generic > modifications to the HTTP/3 layer mostly to support connection pooling. I'm > worried that this will limit support for Http3Transport and complicates any > HTTP/3 implementation that does support it." > > [BA] I have also heard this concern from developers. The concerns > primarily arise from the pooling of HTTP/3 Request/Responses with > WebTransport. This does enable some interesting use cases, such as a > Request/Response (e.g. gRPC) that can result in a server sending datagrams > or initiating bi-directional or uni-directional streams. So there is > perceived value, but the question is whether that value will be widely > supported across the HTTP/3 ecosystem. > > At this point, most generic HTTP/3 servers are not expected to support > HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport > (perceived as a niche protocol), so that pooling would only be possible > when using a framework. node.js will not have QUIC support for 12-18 > months (held up by OpenSSL) so even framework support is expected to be > limited. > Where does this come from? A lot of QUIC servers are implementing QUIC datagrams, and once you have those the delta with h3 datagrams is negligible. Additionally, multiple h3 server implementers have indicated they want to support WebTransport. It's starting to feel like the pushback on HTTP3Transport is purely based on a perception of complexity from folks who haven't tried to implement it? If that's the case, then we should get some implementation experience to confirm or debunk that theory. > On Mon, Nov 16, 2020 at 11:37 AM David Schinazi > wrote: > >> >> >> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley wrote: >> >>> We're on the same page that there's code in HTTP/3 that could be >>> leveraged for QuicTransport in the form of the header parsing. I think >>> there's a path to merge QuicTransport and Http3Transport by leveraging >>> HTTP/3 for the handshake and QUIC for stream delivery. >>> >>> My primary concern is that Http3Transport requires non-generic >>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>> worried that this will limit support for Http3Transport and complicates any >>> HTTP/3 implementation that does support it. >>> >> >> Hi Luke, >> >> I'm curious, could you elaborate on what these "non-generic modifications >> to the HTTP/3 layer" are please? >> >> Thanks, >> David >> >> >>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue >>> wrote: >>> >>>> Hi Luke, >>>> >>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: >>>> >>>>> Just to clarify, when I say "QuicTransport is simpler" I really mean >>>>> "QuicTransport has greater interoperability". You can take any QUIC >>>>> implementation (+ datagram extension) and add a thin layer to support >>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>> want to see in general as QUIC replaces TCP. >>>>> >>>> >>>> Thanks for the clarification. I appreciate the sentiment. But given the >>>> development of QUIC its kind of surprising that people would find it easier >>>> to identify an implementation that supports QUIC and datagram but does not >>>> support HTTP/3. >>>> >>>> Thr situation for a more clean-room implementation is different, I >>>> agree. However, by the time you've done all the hard stuff with QUIC, a >>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>> compression, server push and extensibility points. >>>> >>>> I also see the current design being the thin end of the wedge. The >>>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>>> thin layer to do some parsing. Then folks will probably want some want to >>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>> years of effort. >>>> >>>> Cheers >>>> Lucas >>>> >>>> >>>> >>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>> lucaspardue.24.7@gmail.com> wrote: >>>>> >>>>>> Hi folks, >>>>>> >>>>>> To follow up on one thread of discussion during IETF 109. To over >>>>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>>>> because it simpler and they don't need pooling. >>>>>> >>>>>> I'd like to push more on this, what is the measurable complexity of >>>>>> HTTP/3 over QUIC plus a new application mapping that needs to be defined? >>>>>> Let's isolate pooling as a variable and ignore it. >>>>>> >>>>>> Victor mentioned his proposal for a unified header semantic across >>>>>> all transports, this is >>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>> give it a different ALPN so that we avoid problems related to >>>>>> cross-protocol pooling? >>>>>> >>>>>> Cheers, >>>>>> Lucas >>>>>> -- >>>>>> Webtransport mailing list >>>>>> Webtransport@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>> >>>>> -- >>> Webtransport mailing list >>> Webtransport@ietf.org >>> https://www.ietf.org/mailman/listinfo/webtransport >>> >> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > --000000000000f4dbb205b43faa31 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


    =
    On Mon, Nov 16, 2020 at 12:40 PM Bern= ard Aboba <bernard.aboba@gmai= l.com> wrote:
    Luke said:=C2=A0

    "My primary concern is that Http3Transport requires = non-generic modifications to the HTTP/3 layer mostly to support connection = pooling. I'm worried that this will limit support for Http3Transport an= d complicates any HTTP/3 implementation that does support it."<= /div>

    [BA] I have also heard this concern from developer= s. The concerns primarily arise from the pooling of HTTP/3 Request/Response= s with WebTransport. This does enable some interesting use cases, such as a= Request/Response (e.g. gRPC) that can result in a server sending datagrams= or initiating bi-directional or uni-directional streams.=C2=A0 So there is= perceived value, but the question is whether that value will be widely sup= ported across the HTTP/3 ecosystem.=C2=A0

    At this = point, most generic HTTP/3 servers are not expected to support HTTP/3 datag= rams (not part of the HTTP/3 protocol) or Http3Transport (perceived as a ni= che protocol), so that pooling would only be possible when using a framewor= k.=C2=A0 node.js will not have=C2=A0QUIC support for 12-18 months (held up = by OpenSSL) so even framework support is expected to be limited.

    Where does this come from? A lot of QUIC = servers are implementing QUIC datagrams, and once you have those the delta = with h3 datagrams is negligible. Additionally, multiple h3 server implement= ers=C2=A0have indicated they want to support WebTransport. It's startin= g to feel like the pushback on HTTP3Transport=C2=A0is purely based on a per= ception of complexity from folks who haven't tried to implement it? If = that's the case, then we should get some implementation experience to c= onfirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David Schinazi <dschinazi.ietf@gmai= l.com> wrote:


    On Mon, Nov 16, 2020 at 11:34 AM= Luke Curley <k= ixelated@gmail.com> wrote:
    We're on the same page that there= 9;s code in HTTP/3 that could be leveraged for QuicTransport in the form of= the header parsing. I think there's a path to merge QuicTransport and = Http3Transport by leveraging HTTP/3 for the handshake and QUIC for stream d= elivery.

    My primary concern is that Http3Transport requi= res non-generic modifications to the HTTP/3 layer mostly to support connect= ion pooling. I'm worried that this will limit support for Http3Transpor= t and complicates any HTTP/3 implementation that does support it.

    Hi Luke,

    I'= m curious, could you elaborate on what these "non-generic modification= s to the HTTP/3 layer" are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com> w= rote:
    Hi Luke,

    On Mon, 16 Nov 2020, = 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clarify, when I say &= quot;QuicTransport is simpler" I really mean "QuicTransport has g= reater interoperability". You can take any QUIC implementation (+ data= gram extension) and add a thin layer to support QuicTransport. It's a n= ice layering of protocols and it's something that I want to see in gene= ral as QUIC replaces TCP.

    Thanks for the clarification. I appreciate= the sentiment. But given the development of QUIC its kind of surprising th= at people would find it easier to identify an implementation that supports = QUIC and datagram but does not support HTTP/3.

    <= /div>
    Thr situation for a more clean-room implementation i= s different, I agree. However, by the time you've done all the hard stu= ff with QUIC, a very focused HTTP/3 layer ends up quite thin too. You can i= gnore dynamic compression, server push and extensibility points.

    I also see the current design bein= g the thin end of the wedge. The proposal I linked talks about HTTP-like he= ader parsing. So its "just" a thin layer to do some parsing. Then= folks will probably want some want to tweak parameter, acontrol channel, a= way to do graceful close, a sprinkle of GREASE. To extrapolate forward, wh= at would be the delta be between some final product QuicTransport and HTTP/= 3. Too small a delta and we've wasted years of effort.

    Cheers
    Lucas


    =

    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <lucaspard= ue.24.7@gmail.com> wrote:
    Hi folks,

    T= o follow up on one thread of discussion during IETF 109. To over simplify w= hat we've heard a few folks say, they prefer QuicTransport because it s= impler and they don't need pooling.

    I'd li= ke to push more on this, what is the measurable complexity of HTTP/3 over Q= UIC plus a new application mapping that needs to be defined? Let's isol= ate pooling as a variable and ignore it.

    Victor me= ntioned his proposal for a unified header semantic across all transports, t= his is https://github.c= om/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. Taking a= closer look at it, I have some concerns that I added as comments. HTTP ha= s semantics for a reason. If QuicTransport is going to start borrowing HTTP= piecemeal, I really wonder how simple people might feel it is. I think it&= #39;s important to avoid something that looks like HTTP but behaves differe= ntly. Is it really much of a stretch to just do HTTP/3 but give it a differ= ent ALPN so that we avoid problems related to cross-protocol pooling?
    =

    Cheers,
    Lucas
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000f4dbb205b43faa31-- From nobody Mon Nov 16 15:36:35 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0AED13A16A0 for ; Mon, 16 Nov 2020 15:36:34 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lILKbuc7lMon for ; Mon, 16 Nov 2020 15:36:31 -0800 (PST) Received: from mail-lj1-x233.google.com (mail-lj1-x233.google.com [IPv6:2a00:1450:4864:20::233]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B0B43A169C for ; Mon, 16 Nov 2020 15:36:31 -0800 (PST) Received: by mail-lj1-x233.google.com with SMTP id h23so22116000ljg.13 for ; Mon, 16 Nov 2020 15:36:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=quY8mF/TTuPsO4mnS+AXDdWO7zfGbPSjJT6uhvIksy4=; b=Mgzd1583mXgmd3KvV/gCNf7fwfcaYXrRvdp5SsHFAC17/TPEFHgL/cMciYeygJW8le jEj2jYsJA1U7orwNxUB6RdcsTXU6yjM9fjVhQzDS+xWgQdwVKOIG7BxyNI4/1QT2r25Z qLo5/cWiI4UAWor197N4UVvQ+rl9E7YlqWwyZtQNAszQI7PLU4cInq1DUb5+TD670ij3 9qRcFyLjW+KDQe4dJqJ1VHWhFgPO19iGnXRnXSFeMYea04Pv+id65c/+gMBVcfgYKGOE AhJ0kFzl6JUnNotE8S1OqkCpKljATGlCEnP2Mfs2+3PBELVDF30LFalmmHe0qSHuCj5g eYjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=quY8mF/TTuPsO4mnS+AXDdWO7zfGbPSjJT6uhvIksy4=; b=df0Ig2ct6dupvqZRQyye/g9lV9NpQE9EY5GWull4uCMiduhbEtpIcYTgCZ88910i85 LnH7iM55pLLH/s+1yODOhi1uKYQMQJGDFULrkCy8XTA3JnHtAas1ENJSOGUk36gs1nvK Uqjg75JQeTKE4Q3FoPLoVJxBhNlLxJEvChgVTv1SIiWhr217SovGUhiVFOJjmH9ACP+u fLdSMQyrLP7UQDpgmiS2Yi4ewxrscMKAatuhhnkPU8eLrNnXnjyT3mPDVVI8n8d+2wnn JbcOXAr6mj1WxCpRRCveBUKgSjueHi54Tc3pH+GLojysAcAqUL5EHQjykeh6WbGFEIN4 XfVA== X-Gm-Message-State: AOAM5306N9lIxOi80CCrc+qVLlXe2RxaobviyfZixbLuHCUIya2Z0cHf gYlO+HJ4lGW4zqwqLVmW3V0N2CTE2ywugSRALF4= X-Google-Smtp-Source: ABdhPJyPgId6Of1dvqSBYsb9STr6OwZWsruonZ4UfUbKBjpth1uZmClvpDRfhNHz3qIhnYIRXQgidStop2xRdVIJtXw= X-Received: by 2002:a2e:96c4:: with SMTP id d4mr760000ljj.37.1605569789116; Mon, 16 Nov 2020 15:36:29 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Bernard Aboba Date: Mon, 16 Nov 2020 15:36:19 -0800 Message-ID: To: David Schinazi Cc: Luke Curley , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="000000000000f1448105b441d8f2" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 16 Nov 2020 23:36:34 -0000 --000000000000f1448105b441d8f2 Content-Type: text/plain; charset="UTF-8" David said: "Where does this come from? A lot of QUIC servers are implementing QUIC datagrams, and once you have those the delta with h3 datagrams is negligible. Additionally, multiple h3 server implementers have indicated they want to support WebTransport. It's starting to feel like the pushback on HTTP3Transport is purely based on a perception of complexity from folks who haven't tried to implement it? If that's the case, then we should get some implementation experience to confirm or debunk that theory." [BA] The pooling use cases often involve an interaction between an HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn't just elicit an HTTP/3 Response. It also causes something else to happen, something that isn't specified in the HTTP/3 protocol, such as eliciting a datagram flow or bi/unidirectional stream from the server. This is what is contemplated in several of the "Live Event" use cases, where the HTTP/3 Request/Response would be requesting the desired Event. The major advantage over HLS is avoiding Head-of-Line blocking, reducing video freezes and stalls. So developers understand the value that support for datagrams and server-initiated streams can provide - the question is whether they'll have all the interoperable pieces in place to deploy it. Just because a generic HTTP/3 server supports QUIC and WebTransport, doesn't mean that it will support these use cases. I've been asked whether better interoperability and wider ecosystem support could be achieved by extending HTTP/3 in a way more in keeping with the existing protocol design - such as by allowing an HTTP/3 Request to specify a resource to be returned in a flow of datagrams. The situation might be more tenable if the node.js framework had HTTP/3 and QUIC modules on the horizon. On Mon, Nov 16, 2020 at 1:00 PM David Schinazi wrote: > > > On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba > wrote: > >> Luke said: >> >> "My primary concern is that Http3Transport requires non-generic >> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >> worried that this will limit support for Http3Transport and complicates any >> HTTP/3 implementation that does support it." >> >> [BA] I have also heard this concern from developers. The concerns >> primarily arise from the pooling of HTTP/3 Request/Responses with >> WebTransport. This does enable some interesting use cases, such as a >> Request/Response (e.g. gRPC) that can result in a server sending datagrams >> or initiating bi-directional or uni-directional streams. So there is >> perceived value, but the question is whether that value will be widely >> supported across the HTTP/3 ecosystem. >> >> At this point, most generic HTTP/3 servers are not expected to support >> HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport >> (perceived as a niche protocol), so that pooling would only be possible >> when using a framework. node.js will not have QUIC support for 12-18 >> months (held up by OpenSSL) so even framework support is expected to be >> limited. >> > > Where does this come from? A lot of QUIC servers are implementing QUIC > datagrams, and once you have those the delta with h3 datagrams is > negligible. Additionally, multiple h3 server implementers have indicated > they want to support WebTransport. It's starting to feel like the pushback > on HTTP3Transport is purely based on a perception of complexity from folks > who haven't tried to implement it? If that's the case, then we should get > some implementation experience to confirm or debunk that theory. > > >> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi >> wrote: >> >>> >>> >>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>> wrote: >>> >>>> We're on the same page that there's code in HTTP/3 that could be >>>> leveraged for QuicTransport in the form of the header parsing. I think >>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>> >>>> My primary concern is that Http3Transport requires non-generic >>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>> worried that this will limit support for Http3Transport and complicates any >>>> HTTP/3 implementation that does support it. >>>> >>> >>> Hi Luke, >>> >>> I'm curious, could you elaborate on what these "non-generic >>> modifications to the HTTP/3 layer" are please? >>> >>> Thanks, >>> David >>> >>> >>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>> lucaspardue.24.7@gmail.com> wrote: >>>> >>>>> Hi Luke, >>>>> >>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: >>>>> >>>>>> Just to clarify, when I say "QuicTransport is simpler" I really mean >>>>>> "QuicTransport has greater interoperability". You can take any QUIC >>>>>> implementation (+ datagram extension) and add a thin layer to support >>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>> want to see in general as QUIC replaces TCP. >>>>>> >>>>> >>>>> Thanks for the clarification. I appreciate the sentiment. But given >>>>> the development of QUIC its kind of surprising that people would find it >>>>> easier to identify an implementation that supports QUIC and datagram but >>>>> does not support HTTP/3. >>>>> >>>>> Thr situation for a more clean-room implementation is different, I >>>>> agree. However, by the time you've done all the hard stuff with QUIC, a >>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>>> compression, server push and extensibility points. >>>>> >>>>> I also see the current design being the thin end of the wedge. The >>>>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>> years of effort. >>>>> >>>>> Cheers >>>>> Lucas >>>>> >>>>> >>>>> >>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>> >>>>>>> Hi folks, >>>>>>> >>>>>>> To follow up on one thread of discussion during IETF 109. To over >>>>>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>> because it simpler and they don't need pooling. >>>>>>> >>>>>>> I'd like to push more on this, what is the measurable complexity of >>>>>>> HTTP/3 over QUIC plus a new application mapping that needs to be defined? >>>>>>> Let's isolate pooling as a variable and ignore it. >>>>>>> >>>>>>> Victor mentioned his proposal for a unified header semantic across >>>>>>> all transports, this is >>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>> cross-protocol pooling? >>>>>>> >>>>>>> Cheers, >>>>>>> Lucas >>>>>>> -- >>>>>>> Webtransport mailing list >>>>>>> Webtransport@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>> >>>>>> -- >>>> Webtransport mailing list >>>> Webtransport@ietf.org >>>> https://www.ietf.org/mailman/listinfo/webtransport >>>> >>> -- >>> Webtransport mailing list >>> Webtransport@ietf.org >>> https://www.ietf.org/mailman/listinfo/webtransport >>> >> --000000000000f1448105b441d8f2 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    David said:=C2=A0
    "Where does this come from? A lot of QUIC servers are imp= lementing QUIC datagrams, and once you have those the delta with h3 datagra= ms is negligible. Additionally, multiple h3 server implementers=C2=A0have i= ndicated they want to support WebTransport. It's starting to feel like = the pushback on HTTP3Transport=C2=A0is purely based on a perception of comp= lexity from folks who haven't tried to implement it? If that's the = case, then we should get some implementation experience to confirm or debun= k that theory."

    [BA] The pooling use cases of= ten involve an interaction between an HTTP/3 request/response and WebTransp= ort.=C2=A0 so the HTTP/3 Request doesn't just elicit an HTTP/3 Response= .=C2=A0 It also causes something else to happen, something that isn't s= pecified in the HTTP/3 protocol, such as eliciting a datagram flow or bi/un= idirectional stream from the server.=C2=A0 This is what is contemplated in = several of the "Live Event" use cases, where the HTTP/3 Request/R= esponse would be requesting the desired Event. The major advantage over HLS= is avoiding Head-of-Line blocking, reducing video freezes and stalls.=C2= =A0 So developers understand the value that support for datagrams and serve= r-initiated streams can provide - the question is whether they'll have = all the interoperable pieces in place to deploy it.=C2=A0

    Just because a generic HTTP/3 server supports QUIC and WebTranspor= t, doesn't mean that it will support these use cases.=C2=A0 I've be= en asked whether better interoperability and wider ecosystem support could = be achieved by extending HTTP/3 in a way more in keeping with the existing = protocol design - such as by allowing an HTTP/3 Request to specify a resour= ce to be returned in a flow of datagrams.=C2=A0

    Th= e situation might be more tenable if the node.js framework had HTTP/3 and Q= UIC modules on the horizon.

    On Mon, Nov 16, 2020 at 1:= 00 PM David Schinazi <dschin= azi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 202= 0 at 12:40 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    Luke said:=C2=A0<= div>
    "My primary conc= ern is that Http3Transport requires non-generic modifications to the HTTP/3= layer mostly to support connection pooling. I'm worried that this will= limit support for Http3Transport and complicates any HTTP/3 implementation= that does support it."

    [BA] I have al= so heard this concern from developers. The concerns primarily arise from th= e pooling of HTTP/3 Request/Responses with WebTransport. This does enable s= ome interesting use cases, such as a Request/Response (e.g. gRPC) that can = result in a server sending datagrams or initiating bi-directional or uni-di= rectional streams.=C2=A0 So there is perceived value, but the question is w= hether that value will be widely supported across the HTTP/3 ecosystem.=C2= =A0

    At this point, most generic HTTP/3 servers are= not expected to support HTTP/3 datagrams (not part of the HTTP/3 protocol)= or Http3Transport (perceived as a niche protocol), so that pooling would o= nly be possible when using a framework.=C2=A0 node.js will not have=C2=A0QU= IC support for 12-18 months (held up by OpenSSL) so even framework support = is expected to be limited.

    Wher= e does this come from? A lot of QUIC servers are implementing QUIC datagram= s, and once you have those the delta with h3 datagrams is negligible. Addit= ionally, multiple h3 server implementers=C2=A0have indicated they want to s= upport WebTransport. It's starting to feel like the pushback on HTTP3Tr= ansport=C2=A0is purely based on a perception of complexity from folks who h= aven't tried to implement it? If that's the case, then we should ge= t some implementation experience to confirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020= at 11:37 AM David Schinazi <dschinazi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 2020 at 11:34 AM Luke Curley <kixelated@gmail.com> wrote:
    =
    We= 're on the same page that there's code in HTTP/3 that could be leve= raged for QuicTransport in the form of the header parsing. I think there= 9;s a path to merge QuicTransport and Http3Transport by leveraging HTTP/3 f= or the handshake and QUIC for stream delivery.

    My primar= y concern is that Http3Transport requires non-generic modifications to the = HTTP/3 layer mostly to support connection pooling. I'm worried that thi= s will limit support for Http3Transport and complicates any HTTP/3 implemen= tation that does support it.

    Hi= Luke,

    I'm curious, could you elaborate on wha= t these "non-generic modifications to the HTTP/3 layer" are pleas= e?

    Thanks,
    David
    =C2=A0
    <= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
    On Mon, Nov 16, 2020 at 4:49 AM Luca= s Pardue <lucaspardue.24.7@gmail.com> wrote:
    Hi Luke,

    On Mon, 16 Nov 2020, 12:26 Luke Curley, <kixelated@gmail.com> wrot= e:
    Just to clarify, when I say "QuicTransport is simpler" I= really mean "QuicTransport has greater interoperability". You ca= n take any QUIC implementation (+ datagram extension) and add a thin layer = to support QuicTransport. It's a nice layering of protocols and it'= s something that I want to see in general as QUIC replaces TCP.
    =

    Than= ks for the clarification. I appreciate the sentiment. But given the develop= ment of QUIC its kind of surprising that people would find it easier to ide= ntify an implementation that supports QUIC and datagram but does not suppor= t HTTP/3.

    Thr situation = for a more clean-room implementation is different, I agree. However, by the= time you've done all the hard stuff with QUIC, a very focused HTTP/3 l= ayer ends up quite thin too. You can ignore dynamic compression, server pus= h and extensibility points.

    I also see the current design being the thin end of the wedge. The prop= osal I linked talks about HTTP-like header parsing. So its "just"= a thin layer to do some parsing. Then folks will probably want some want t= o tweak parameter, acontrol channel, a way to do graceful close, a sprinkle= of GREASE. To extrapolate forward, what would be the delta be between some= final product QuicTransport and HTTP/3. Too small a delta and we've wa= sted years of effort.

    Ch= eers
    Lucas



    On Mon, Nov 16, 2020 at 3:16= AM Lucas Pardue <lucaspardue.24.7@gmail.com> wrote:
    <= /div>
    Hi folks,

    To follow up on one thread of discussi= on during IETF 109. To over simplify what we've heard a few folks say, = they prefer QuicTransport because it simpler and they don't need poolin= g.

    I'd like to push more on this, what is the = measurable complexity of HTTP/3 over QUIC plus a new application mapping th= at needs to be defined? Let's isolate pooling as a variable and ignore = it.

    Victor mentioned his proposal for a unified he= ader semantic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtra= ns-overview/pull/4/files. Taking a closer look at it, I have some conce= rns that I added as comments. HTTP has semantics for a reason. If QuicTran= sport is going to start borrowing HTTP piecemeal, I really wonder how simpl= e people might feel it is. I think it's important to avoid something th= at looks like HTTP but behaves differently. Is it really much of a stretch = to just do HTTP/3 but give it a different ALPN so that we avoid problems re= lated to cross-protocol pooling?

    Cheers,
    Lucas
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000f1448105b441d8f2-- From nobody Mon Nov 16 16:46:08 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 9C8793A1799 for ; Mon, 16 Nov 2020 16:46:06 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -17.599 X-Spam-Level: X-Spam-Status: No, score=-17.599 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, ENV_AND_HDR_SPF_MATCH=-0.5, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001, USER_IN_DEF_DKIM_WL=-7.5, USER_IN_DEF_SPF_WL=-7.5] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=google.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id jV00b71ulQMq for ; Mon, 16 Nov 2020 16:46:04 -0800 (PST) Received: from mail-yb1-xb2b.google.com (mail-yb1-xb2b.google.com [IPv6:2607:f8b0:4864:20::b2b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 3E5FA3A1797 for ; Mon, 16 Nov 2020 16:45:50 -0800 (PST) Received: by mail-yb1-xb2b.google.com with SMTP id w5so4947530ybj.11 for ; Mon, 16 Nov 2020 16:45:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=3tQi2Xd0PoaA0VDxNwmvvPhYhIiG4ybJMOXxyQUNBJ0=; b=GHSWzCNMrZnxP75bpMYVeMioIIn9Tndy1E/5fLx/jMlysYeZjRh0SEhj7k9MekCKBX xEuXJHrbB8uAgWWzo7XGDD/xx520qpA6r7EidyRT90isOZLMkqH9GjI9Wy4y/0TsHPZD DLzLRM70Kf/mhHqk+6Pff+m+MViGBCW4/pRkznMfVfLi8rceTOoFE0ryd1uw7SdvfsZ2 O+XqlatQBA3uWkH5W0rm9+wcPAIISmohVq8+bOuSvEuBeZEimAkb8YtGtuIRGrXeMKoF 5D0dPfNZiTxK8w9lAK2odNqipvgJsQgtg67hWBj7YsEVTqvT/fX9dUHZBzT4EYWw7Rbs rgew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=3tQi2Xd0PoaA0VDxNwmvvPhYhIiG4ybJMOXxyQUNBJ0=; b=qpEQ9aJQ0H9ll/e8jWU3A/LGowKF8gFytObvfITzpiFOC7EE0MsyA8zimfnLfeqdzP kk1HtBLzHgVHOaGBz3O1XsszMGNq6QHz/DZ6JjQV88MdIrb2uzpBsQ2KXKS27sCIYL/Y dRsDsp2VxFtc8SLrzsnHH4pIR3S5Hy+HMa43KvSMIc3+jb7YtNVUT53GBYgpXkfWbqmn hg5zWrad7GK/Gc5x+hFK8a9EgGKXveE/9j6DRuJLLfZjY1sPeIqjEPKtfcJD4jBF/zGL KUdLzWCblYIVKQQacRiHDXJzdbsEFAw/28LZJM8/6VTQBfqq3KKmSJDa9XlPcRKZBDzZ UOGQ== X-Gm-Message-State: AOAM533sKEbxinsu+s50dq7yGUTgUW8YFPef0jnoOrZqsqX9oUtLhQDH faDXziKSpVQRsVCjl1iNHbNp3ML4Ha2EYAcn26FQNQ== X-Google-Smtp-Source: ABdhPJxzccGpxulQ17noyoBCogGVHjK4lHu6X+sihBzG4dUntni4B/tgPqg/23Ir5oDeOFYW/4sNQ0Ep1eYaIHah990= X-Received: by 2002:a25:7e82:: with SMTP id z124mr29070773ybc.388.1605573949130; Mon, 16 Nov 2020 16:45:49 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Ian Swett Date: Mon, 16 Nov 2020 19:45:37 -0500 Message-ID: To: Bernard Aboba Cc: David Schinazi , WebTransport , Luke Curley , Lucas Pardue Content-Type: multipart/alternative; boundary="000000000000e6724305b442d01f" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 00:46:07 -0000 --000000000000e6724305b442d01f Content-Type: text/plain; charset="UTF-8" I'm *very* concerned about any functionality that *requires* pooling. Pooling is a client-specific optimization and pooling policy is subject to change(within reason) at any time. If applications are saying "it'd be cool if we could share congestion control and loss recovery state between H3 and WebTransport most of the time", then I can see there being real(albeit small) benefits, just like there would be for putting DataChannels and RTP into one QUIC connection for WebRTC. If people are intending to rely on pooling so an HTTP(hopefully H3) request can trigger a WebTransport response, I think we're in a world of pain and over-optimization. This is more obvious in light of the fact that a WebTransport endpoint is likely not a generic CDN endpoint, as has been clearly stated by Mark Nottingham. Bernard's comments above point to a tighter coupling between HTTP/3 and WebTransport than I think is practical in production, unless I misunderstood(which I may have, it's been a long day). All of this makes me think we should punt the HTTP based WebTransport options down the road a year or so and focus on QuicTransport initially. It's not to say we won't do them, but they're clearly more complex than QuicTransport and it'd be good to have real deployment experience prior to starting so we know what the requirements are and where the dragons are lurking. Also, the W3C should design APIs that make it easy to detect failure to establish a QUIC-based WebTransport, and this ensures those are well exercised. Maybe we DO require pooling under certain conditions and describe those, but there are likely privacy concerns under some circumstances and I'm not enough of an expert to know what would be acceptable to all clients. Some people in the WG may think we have to release a TCP based WebTransport at the same time as a QUIC based one, but I don't think that's true and even if we standardized them at the same time, it doesn't mean both will achieve wide deployment at the same time. As I said at the mic, I don't see any reason YouTube would deploy a TCP based WebTransport given it will have to maintain an HTTP/1.1 option for basically forever and they've spent a good bit of effort to make sure that works as well as it can. It's clear to me there are compelling use cases right now for QuicTransport, but the driving use cases for the fallback are not clear to me. Consistency is intellectually appealing, but doesn't drive deployments. Ian On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba wrote: > David said: > > "Where does this come from? A lot of QUIC servers are implementing QUIC > datagrams, and once you have those the delta with h3 datagrams is > negligible. Additionally, multiple h3 server implementers have indicated > they want to support WebTransport. It's starting to feel like the pushback > on HTTP3Transport is purely based on a perception of complexity from folks > who haven't tried to implement it? If that's the case, then we should get > some implementation experience to confirm or debunk that theory." > > [BA] The pooling use cases often involve an interaction between an HTTP/3 > request/response and WebTransport. so the HTTP/3 Request doesn't just > elicit an HTTP/3 Response. It also causes something else to happen, > something that isn't specified in the HTTP/3 protocol, such as eliciting a > datagram flow or bi/unidirectional stream from the server. This is what is > contemplated in several of the "Live Event" use cases, where the HTTP/3 > Request/Response would be requesting the desired Event. The major advantage > over HLS is avoiding Head-of-Line blocking, reducing video freezes and > stalls. So developers understand the value that support for datagrams and > server-initiated streams can provide - the question is whether they'll have > all the interoperable pieces in place to deploy it. > > Just because a generic HTTP/3 server supports QUIC and WebTransport, > doesn't mean that it will support these use cases. I've been asked whether > better interoperability and wider ecosystem support could be achieved by > extending HTTP/3 in a way more in keeping with the existing protocol design > - such as by allowing an HTTP/3 Request to specify a resource to be > returned in a flow of datagrams. > > The situation might be more tenable if the node.js framework had HTTP/3 > and QUIC modules on the horizon. > > On Mon, Nov 16, 2020 at 1:00 PM David Schinazi > wrote: > >> >> >> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba >> wrote: >> >>> Luke said: >>> >>> "My primary concern is that Http3Transport requires non-generic >>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>> worried that this will limit support for Http3Transport and complicates any >>> HTTP/3 implementation that does support it." >>> >>> [BA] I have also heard this concern from developers. The concerns >>> primarily arise from the pooling of HTTP/3 Request/Responses with >>> WebTransport. This does enable some interesting use cases, such as a >>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>> or initiating bi-directional or uni-directional streams. So there is >>> perceived value, but the question is whether that value will be widely >>> supported across the HTTP/3 ecosystem. >>> >>> At this point, most generic HTTP/3 servers are not expected to support >>> HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport >>> (perceived as a niche protocol), so that pooling would only be possible >>> when using a framework. node.js will not have QUIC support for 12-18 >>> months (held up by OpenSSL) so even framework support is expected to be >>> limited. >>> >> >> Where does this come from? A lot of QUIC servers are implementing QUIC >> datagrams, and once you have those the delta with h3 datagrams is >> negligible. Additionally, multiple h3 server implementers have indicated >> they want to support WebTransport. It's starting to feel like the pushback >> on HTTP3Transport is purely based on a perception of complexity from folks >> who haven't tried to implement it? If that's the case, then we should get >> some implementation experience to confirm or debunk that theory. >> >> >>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>> dschinazi.ietf@gmail.com> wrote: >>> >>>> >>>> >>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>> wrote: >>>> >>>>> We're on the same page that there's code in HTTP/3 that could be >>>>> leveraged for QuicTransport in the form of the header parsing. I think >>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>> >>>>> My primary concern is that Http3Transport requires non-generic >>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>> worried that this will limit support for Http3Transport and complicates any >>>>> HTTP/3 implementation that does support it. >>>>> >>>> >>>> Hi Luke, >>>> >>>> I'm curious, could you elaborate on what these "non-generic >>>> modifications to the HTTP/3 layer" are please? >>>> >>>> Thanks, >>>> David >>>> >>>> >>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>> lucaspardue.24.7@gmail.com> wrote: >>>>> >>>>>> Hi Luke, >>>>>> >>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: >>>>>> >>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really mean >>>>>>> "QuicTransport has greater interoperability". You can take any QUIC >>>>>>> implementation (+ datagram extension) and add a thin layer to support >>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>> want to see in general as QUIC replaces TCP. >>>>>>> >>>>>> >>>>>> Thanks for the clarification. I appreciate the sentiment. But given >>>>>> the development of QUIC its kind of surprising that people would find it >>>>>> easier to identify an implementation that supports QUIC and datagram but >>>>>> does not support HTTP/3. >>>>>> >>>>>> Thr situation for a more clean-room implementation is different, I >>>>>> agree. However, by the time you've done all the hard stuff with QUIC, a >>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>>>> compression, server push and extensibility points. >>>>>> >>>>>> I also see the current design being the thin end of the wedge. The >>>>>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>> years of effort. >>>>>> >>>>>> Cheers >>>>>> Lucas >>>>>> >>>>>> >>>>>> >>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>> >>>>>>>> Hi folks, >>>>>>>> >>>>>>>> To follow up on one thread of discussion during IETF 109. To over >>>>>>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>> because it simpler and they don't need pooling. >>>>>>>> >>>>>>>> I'd like to push more on this, what is the measurable complexity of >>>>>>>> HTTP/3 over QUIC plus a new application mapping that needs to be defined? >>>>>>>> Let's isolate pooling as a variable and ignore it. >>>>>>>> >>>>>>>> Victor mentioned his proposal for a unified header semantic across >>>>>>>> all transports, this is >>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>> cross-protocol pooling? >>>>>>>> >>>>>>>> Cheers, >>>>>>>> Lucas >>>>>>>> -- >>>>>>>> Webtransport mailing list >>>>>>>> Webtransport@ietf.org >>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>> >>>>>>> -- >>>>> Webtransport mailing list >>>>> Webtransport@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>> >>>> -- >>>> Webtransport mailing list >>>> Webtransport@ietf.org >>>> https://www.ietf.org/mailman/listinfo/webtransport >>>> >>> -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --000000000000e6724305b442d01f Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    I'm very concerned about any functionality that= requires pooling.=C2=A0 Pooling is a client-specific optimization a= nd pooling policy is subject to change(within reason) at any time.=C2=A0 If= applications=C2=A0are saying "it'd be cool if we could share cong= estion control and loss recovery state between H3 and WebTransport most of = the time", then I can see there being real(albeit small) benefits, jus= t like there would be for putting DataChannels and RTP into one QUIC connec= tion for WebRTC.=C2=A0 If people are intending to rely on pooling so an HTT= P(hopefully H3) request can trigger a WebTransport response, I think we'= ;re in a world of pain and over-optimization.

    This is mo= re obvious in light of the fact that a WebTransport endpoint=C2=A0is likely= not a generic CDN endpoint, as has been clearly stated by Mark Nottingham.=

    Bernard's comments above point to a tighter cou= pling between HTTP/3 and WebTransport than I think is practical in producti= on, unless I misunderstood(which I may have, it's been a long day).

    All of this makes me think we should punt the HTTP ba= sed WebTransport options down the road a year or so and focus on QuicTransp= ort=C2=A0initially.=C2=A0 It's not to say we won't do them, but the= y're clearly more complex than=C2=A0QuicTransport=C2=A0and it'd be = good to have real deployment experience prior to starting so we know what t= he requirements are and where the dragons are lurking.=C2=A0 Also, the W3C = should design APIs that make it easy to detect failure to establish a QUIC-= based=C2=A0WebTransport, and this ensures those are well exercised.=C2=A0 M= aybe we DO require pooling under certain conditions and describe those, but= there are likely privacy concerns under some circumstances and I'm not= enough of an expert to know what would be acceptable to all clients.
    =

    Some=C2=A0people in the WG may think we have to release= a TCP based WebTransport at the same time as a QUIC based one, but I don&#= 39;t think that's true and even if we standardized them at the same tim= e, it doesn't mean both will achieve wide deployment at the same time.= =C2=A0 As I said at the mic, I don't see any reason YouTube would deplo= y a TCP based WebTransport given it will have to maintain an HTTP/1.1 optio= n for basically forever and they've spent a good bit of effort to make = sure that works as well as it can.=C2=A0 It's clear to me there are com= pelling use cases right now for QuicTransport, but=C2=A0the driving use cas= es for the fallback are not clear to me.=C2=A0 Consistency is intellectuall= y appealing, but doesn't drive deployments.

    <= div>Ian

    On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    David said:=C2=A0

    "Wh= ere does this come from? A lot of QUIC servers are implementing QUIC datagr= ams, and once you have those the delta with h3 datagrams is negligible. Add= itionally, multiple h3 server implementers=C2=A0have indicated they want to= support WebTransport. It's starting to feel like the pushback on HTTP3= Transport=C2=A0is purely based on a perception of complexity from folks who= haven't tried to implement it? If that's the case, then we should = get some implementation experience to confirm or debunk that theory."<= /div>

    [BA] The pooling use cases often involve an intera= ction between an HTTP/3 request/response and WebTransport.=C2=A0 so the HTT= P/3 Request doesn't just elicit an HTTP/3 Response.=C2=A0 It also cause= s something else to happen, something that isn't specified in the HTTP/= 3 protocol, such as eliciting a datagram flow or bi/unidirectional stream f= rom the server.=C2=A0 This is what is contemplated in several of the "= Live Event" use cases, where the HTTP/3 Request/Response would be requ= esting the desired Event. The major advantage over HLS is avoiding Head-of-= Line blocking, reducing video freezes and stalls.=C2=A0 So developers under= stand the value that support for datagrams and server-initiated streams can= provide - the question is whether they'll have all the interoperable p= ieces in place to deploy it.=C2=A0

    Just because a= generic HTTP/3 server supports QUIC and WebTransport, doesn't mean tha= t it will support these use cases.=C2=A0 I've been asked whether better= interoperability and wider ecosystem support could be achieved by extendin= g HTTP/3 in a way more in keeping with the existing protocol design - such = as by allowing an HTTP/3 Request to specify a resource to be returned in a = flow of datagrams.=C2=A0

    The situation might be mo= re tenable if the node.js framework had HTTP/3 and QUIC modules on the hori= zon.

    On Mon, Nov 16, 2020 at 1:00 PM David Schinazi &l= t;dschinazi.i= etf@gmail.com> wrote:


    On Mon, Nov 16, 2020 at = 12:40 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    Luke said:=C2=A0
    <= br>
    "My primary concern i= s that Http3Transport requires non-generic modifications to the HTTP/3 laye= r mostly to support connection pooling. I'm worried that this will limi= t support for Http3Transport and complicates any HTTP/3 implementation that= does support it."

    [BA] I have also he= ard this concern from developers. The concerns primarily arise from the poo= ling of HTTP/3 Request/Responses with WebTransport. This does enable some i= nteresting use cases, such as a Request/Response (e.g. gRPC) that can resul= t in a server sending datagrams or initiating bi-directional or uni-directi= onal streams.=C2=A0 So there is perceived value, but the question is whethe= r that value will be widely supported across the HTTP/3 ecosystem.=C2=A0

    At this point, most generic HTTP/3 servers are not e= xpected to support HTTP/3 datagrams (not part of the HTTP/3 protocol) or Ht= tp3Transport (perceived as a niche protocol), so that pooling would only be= possible when using a framework.=C2=A0 node.js will not have=C2=A0QUIC sup= port for 12-18 months (held up by OpenSSL) so even framework support is exp= ected to be limited.

    Where does= this come from? A lot of QUIC servers are implementing QUIC datagrams, and= once you have those the delta with h3 datagrams is negligible. Additionall= y, multiple h3 server implementers=C2=A0have indicated they want to support= WebTransport. It's starting to feel like the pushback on HTTP3Transpor= t=C2=A0is purely based on a perception of complexity from folks who haven&#= 39;t tried to implement it? If that's the case, then we should get some= implementation experience to confirm or debunk that theory.
    =C2= =A0
    On Mon, Nov 16, 2020 at 11= :37 AM David Schinazi <dschinazi.ietf@gmail.com> wrote:

    =

    = On Mon, Nov 16, 2020 at 11:34 AM Luke Curley <kixelated@gmail.com> wrote:
    =
    We'r= e on the same page that there's code in HTTP/3 that could be leveraged = for QuicTransport in the form of the header parsing. I think there's a = path to merge QuicTransport and Http3Transport by leveraging HTTP/3 for the= handshake and QUIC for stream delivery.

    My primary conc= ern is that Http3Transport requires non-generic modifications to the HTTP/3= layer mostly to support connection pooling. I'm worried that this will= limit support for Http3Transport and complicates any HTTP/3 implementation= that does support it.

    Hi Luke,=

    I'm curious, could you elaborate on what thes= e "non-generic modifications to the HTTP/3 layer" are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pard= ue <luca= spardue.24.7@gmail.com> wrote:
    Hi Luke,

    On Mon, 16 Nov 2020, 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clarify, when I say "QuicTransport is simpler" I really = mean "QuicTransport has greater interoperability". You can take a= ny QUIC implementation (+ datagram extension) and add a thin layer to suppo= rt QuicTransport. It's a nice layering of protocols and it's someth= ing that I want to see in general as QUIC replaces TCP.

    Thanks for t= he clarification. I appreciate the sentiment. But given the development of = QUIC its kind of surprising that people would find it easier to identify an= implementation that supports QUIC and datagram but does not support HTTP/3= .

    Thr situation for a mo= re clean-room implementation is different, I agree. However, by the time yo= u've done all the hard stuff with QUIC, a very focused HTTP/3 layer end= s up quite thin too. You can ignore dynamic compression, server push and ex= tensibility points.

    I al= so see the current design being the thin end of the wedge. The proposal I l= inked talks about HTTP-like header parsing. So its "just" a thin = layer to do some parsing. Then folks will probably want some want to tweak = parameter, acontrol channel, a way to do graceful close, a sprinkle of GREA= SE. To extrapolate forward, what would be the delta be between some final p= roduct QuicTransport and HTTP/3. Too small a delta and we've wasted yea= rs of effort.

    Cheers
    Lucas



    On Mon, Nov 16, 2020 at 3:16 AM Luca= s Pardue <lucaspardue.24.7@gmail.com> wrote:
    Hi fol= ks,

    To follow up on one thread of discussion durin= g IETF 109. To over simplify what we've heard a few folks say, they pre= fer QuicTransport because it simpler and they don't need pooling.
    =

    I'd like to push more on this, what is the measurab= le complexity of HTTP/3 over QUIC plus a new application mapping that needs= to be defined? Let's isolate pooling as a variable and ignore it.

    Victor mentioned his proposal for a unified header sem= antic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overv= iew/pull/4/files. Taking a closer look at it, I have some concerns that= I added as comments. HTTP has semantics for a reason. If QuicTransport is= going to start borrowing HTTP piecemeal, I really wonder how simple people= might feel it is. I think it's important to avoid something that looks= like HTTP but behaves differently. Is it really much of a stretch to just = do HTTP/3 but give it a different ALPN so that we avoid problems related to= cross-protocol pooling?

    Cheers,
    Lucas
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000e6724305b442d01f-- From nobody Mon Nov 16 17:10:16 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 72AFB3A17EB for ; Mon, 16 Nov 2020 17:10:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id D73up1Ihw624 for ; Mon, 16 Nov 2020 17:10:13 -0800 (PST) Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 8A7BE3A17E9 for ; Mon, 16 Nov 2020 17:10:12 -0800 (PST) Received: by mail-lf1-x129.google.com with SMTP id f11so27853106lfs.3 for ; Mon, 16 Nov 2020 17:10:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=jQGe+S66YRqq6pnClx4acTsXhXcDFi6hayVJJH86jaM=; b=WLQAnMV5jD1SUOpEJndPAWd/uPjQ1UNCTgRmNqZ/7vyEQ7E8Sm24SZqSauWb5K2kFr fLn+kPHezEcnK4MzZ0dkXchpYNi/BFQ7XfkE/8EElZ70Gd4g+sHzQ3lYvzPnPnSKvWx9 XoNMd07CH6bukFoF1G3uRvwLGQhWPFiPjlawmDhTuVsL25B7mjNxxSUud8+FvxPmVLhX MJm92tAWX6legIyQkQMpI1McwxvwLS7cQpdHBydOwlK8x5pUUF59X5tkRvKv7qlhQeGN AVU5P54EiHOB3LiCmJFBZgSOMEZtihL2FzyiDGkQXqrz7G52v7FNfj53yMl3J2Ok2109 sypg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=jQGe+S66YRqq6pnClx4acTsXhXcDFi6hayVJJH86jaM=; b=fpks4obqIqR91EEgPSsgTfNDhqN1oTaD929GxNQe9QUXOm+mOQABT63OuVsCIxzS5o ZzBPOHUXf4fbvzS1AsufDGIZRVpSh8XkXM06oKNi0HnWQcez/0i0vkkcyuto4pEqlk/X M1jDsL6e2DIWI56bvJrSNsACiSrDbEySFh9BRKP/6n09osz7nRvmh5Xb9XZw5a+xINzX FIHiRmZ822Uxb2wDs7Z8jjJBE52SmbM0+9TvV9zPBh81PgC1CojRSdfl7fJaOBjLGtQ4 /SuosPgd6sNXAAjruyzfRZoZo2qGYq2MMgilpgvtTMARVtC6Jcmdvl5steeRV+9XiiCl 5VcQ== X-Gm-Message-State: AOAM5302Kzgfm/Kj7gkkqRzY/6C4qHft5ICuxg3oAfwg5XZbqWnxm/Q7 apXkV6bCdb7SlboWuJxQCccxCHRSkNwGBR3a2L0= X-Google-Smtp-Source: ABdhPJzjnvF412APRTuhs8iB/16GOgIuGps2SFTG/6HHftEyfE2NzMRau8NRCOqtWs95HCHuBvpvtyBrF4/ZqthubW4= X-Received: by 2002:a19:e4a:: with SMTP id 71mr654837lfo.505.1605575410532; Mon, 16 Nov 2020 17:10:10 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: David Schinazi Date: Mon, 16 Nov 2020 17:09:59 -0800 Message-ID: To: Ian Swett Cc: Bernard Aboba , WebTransport , Luke Curley , Lucas Pardue Content-Type: multipart/alternative; boundary="0000000000000143cf05b44328dc" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 01:10:15 -0000 --0000000000000143cf05b44328dc Content-Type: text/plain; charset="UTF-8" I'd like us to take a step back, I think we're conflating many different topics here, and it's making it impossible to reason about this (at least for someone running on not enough sleep like I am this week). Topic 1: the complexity of implementing Http3Transport as opposed to QuicTransport on the client From my perspective, all browsers interested in WebTransport are implementing HTTP/3, so I don't see much complexity there. Please reply here if you know of complexities I'm not seeing Topic 2: the complexity of implementing Http3Transport as opposed to QuicTransport on the server As far as I know, most server-side QUIC stacks also support HTTP/3, and for QuicTransport they already have DATAGRAM support so I think the delta is negligible. Please reply here if you know of complexities I'm not seeing Topic 3: the benefits of pooling WebTransport This allows saving round trips to get WebTransport up and running This allows sharing congestion control state This allows letting the QUIC implementation prioritize DATAGRAMs vs HTTP requests instead of relying on the kernel or routers which have less information Overall, I think pooling is beneficial (though not an absolute must-have) Please reply here if you know of benefits I'm not seeing Topic 4: the difficulty of pooling Http3Transport on the client It appears that all browsers that are interested in WebTransport are implementing pooling in their HTTP/3 stack so additionally pooling WebTransport should not introduce more complexity Please reply here if you know of complexities I'm not seeing Topic 5: the difficulty of pooling Http3Transport on the server This one is trickier. If you have frontends that know how to route HTTP requests to backends, DATAGRAM support is going to be a whole new world. However, and I think this is really important: implementing this on the server is OPTIONAL. The server can easily use a different hostname (and different TLS certificates) for HTTP vs WebTransport and clients will not pool the two together. Once you use different domain names per WebTransport object, Http3Transport has the exact same pooling properties as QuicTransport. Please reply here if you know of complexities I'm not seeing What am I missing? Thanks, David On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: > I'm *very* concerned about any functionality that *requires* pooling. > Pooling is a client-specific optimization and pooling policy is subject to > change(within reason) at any time. If applications are saying "it'd be > cool if we could share congestion control and loss recovery state between > H3 and WebTransport most of the time", then I can see there being > real(albeit small) benefits, just like there would be for putting > DataChannels and RTP into one QUIC connection for WebRTC. If people are > intending to rely on pooling so an HTTP(hopefully H3) request can trigger a > WebTransport response, I think we're in a world of pain and > over-optimization. > > This is more obvious in light of the fact that a WebTransport endpoint is > likely not a generic CDN endpoint, as has been clearly stated by Mark > Nottingham. > > Bernard's comments above point to a tighter coupling between HTTP/3 and > WebTransport than I think is practical in production, unless I > misunderstood(which I may have, it's been a long day). > > All of this makes me think we should punt the HTTP based WebTransport > options down the road a year or so and focus on QuicTransport initially. > It's not to say we won't do them, but they're clearly more complex > than QuicTransport and it'd be good to have real deployment experience > prior to starting so we know what the requirements are and where the > dragons are lurking. Also, the W3C should design APIs that make it easy to > detect failure to establish a QUIC-based WebTransport, and this ensures > those are well exercised. Maybe we DO require pooling under certain > conditions and describe those, but there are likely privacy concerns under > some circumstances and I'm not enough of an expert to know what would be > acceptable to all clients. > > Some people in the WG may think we have to release a TCP based > WebTransport at the same time as a QUIC based one, but I don't think that's > true and even if we standardized them at the same time, it doesn't mean > both will achieve wide deployment at the same time. As I said at the mic, > I don't see any reason YouTube would deploy a TCP based WebTransport given > it will have to maintain an HTTP/1.1 option for basically forever and > they've spent a good bit of effort to make sure that works as well as it > can. It's clear to me there are compelling use cases right now for > QuicTransport, but the driving use cases for the fallback are not clear to > me. Consistency is intellectually appealing, but doesn't drive deployments. > > Ian > > On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba > wrote: > >> David said: >> >> "Where does this come from? A lot of QUIC servers are implementing QUIC >> datagrams, and once you have those the delta with h3 datagrams is >> negligible. Additionally, multiple h3 server implementers have indicated >> they want to support WebTransport. It's starting to feel like the pushback >> on HTTP3Transport is purely based on a perception of complexity from folks >> who haven't tried to implement it? If that's the case, then we should get >> some implementation experience to confirm or debunk that theory." >> >> [BA] The pooling use cases often involve an interaction between an HTTP/3 >> request/response and WebTransport. so the HTTP/3 Request doesn't just >> elicit an HTTP/3 Response. It also causes something else to happen, >> something that isn't specified in the HTTP/3 protocol, such as eliciting a >> datagram flow or bi/unidirectional stream from the server. This is what is >> contemplated in several of the "Live Event" use cases, where the HTTP/3 >> Request/Response would be requesting the desired Event. The major advantage >> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >> stalls. So developers understand the value that support for datagrams and >> server-initiated streams can provide - the question is whether they'll have >> all the interoperable pieces in place to deploy it. >> >> Just because a generic HTTP/3 server supports QUIC and WebTransport, >> doesn't mean that it will support these use cases. I've been asked whether >> better interoperability and wider ecosystem support could be achieved by >> extending HTTP/3 in a way more in keeping with the existing protocol design >> - such as by allowing an HTTP/3 Request to specify a resource to be >> returned in a flow of datagrams. >> >> The situation might be more tenable if the node.js framework had HTTP/3 >> and QUIC modules on the horizon. >> >> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi >> wrote: >> >>> >>> >>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba >>> wrote: >>> >>>> Luke said: >>>> >>>> "My primary concern is that Http3Transport requires non-generic >>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>> worried that this will limit support for Http3Transport and complicates any >>>> HTTP/3 implementation that does support it." >>>> >>>> [BA] I have also heard this concern from developers. The concerns >>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>> WebTransport. This does enable some interesting use cases, such as a >>>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>>> or initiating bi-directional or uni-directional streams. So there is >>>> perceived value, but the question is whether that value will be widely >>>> supported across the HTTP/3 ecosystem. >>>> >>>> At this point, most generic HTTP/3 servers are not expected to support >>>> HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport >>>> (perceived as a niche protocol), so that pooling would only be possible >>>> when using a framework. node.js will not have QUIC support for 12-18 >>>> months (held up by OpenSSL) so even framework support is expected to be >>>> limited. >>>> >>> >>> Where does this come from? A lot of QUIC servers are implementing QUIC >>> datagrams, and once you have those the delta with h3 datagrams is >>> negligible. Additionally, multiple h3 server implementers have indicated >>> they want to support WebTransport. It's starting to feel like the pushback >>> on HTTP3Transport is purely based on a perception of complexity from folks >>> who haven't tried to implement it? If that's the case, then we should get >>> some implementation experience to confirm or debunk that theory. >>> >>> >>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>> dschinazi.ietf@gmail.com> wrote: >>>> >>>>> >>>>> >>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>> wrote: >>>>> >>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>> leveraged for QuicTransport in the form of the header parsing. I think >>>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>> >>>>>> My primary concern is that Http3Transport requires non-generic >>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>> HTTP/3 implementation that does support it. >>>>>> >>>>> >>>>> Hi Luke, >>>>> >>>>> I'm curious, could you elaborate on what these "non-generic >>>>> modifications to the HTTP/3 layer" are please? >>>>> >>>>> Thanks, >>>>> David >>>>> >>>>> >>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>> >>>>>>> Hi Luke, >>>>>>> >>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: >>>>>>> >>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really >>>>>>>> mean "QuicTransport has greater interoperability". You can take any QUIC >>>>>>>> implementation (+ datagram extension) and add a thin layer to support >>>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>> >>>>>>> >>>>>>> Thanks for the clarification. I appreciate the sentiment. But given >>>>>>> the development of QUIC its kind of surprising that people would find it >>>>>>> easier to identify an implementation that supports QUIC and datagram but >>>>>>> does not support HTTP/3. >>>>>>> >>>>>>> Thr situation for a more clean-room implementation is different, I >>>>>>> agree. However, by the time you've done all the hard stuff with QUIC, a >>>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>>>>> compression, server push and extensibility points. >>>>>>> >>>>>>> I also see the current design being the thin end of the wedge. The >>>>>>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>>> years of effort. >>>>>>> >>>>>>> Cheers >>>>>>> Lucas >>>>>>> >>>>>>> >>>>>>> >>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>> >>>>>>>>> Hi folks, >>>>>>>>> >>>>>>>>> To follow up on one thread of discussion during IETF 109. To over >>>>>>>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>> >>>>>>>>> I'd like to push more on this, what is the measurable complexity >>>>>>>>> of HTTP/3 over QUIC plus a new application mapping that needs to be >>>>>>>>> defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>> >>>>>>>>> Victor mentioned his proposal for a unified header semantic across >>>>>>>>> all transports, this is >>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>> cross-protocol pooling? >>>>>>>>> >>>>>>>>> Cheers, >>>>>>>>> Lucas >>>>>>>>> -- >>>>>>>>> Webtransport mailing list >>>>>>>>> Webtransport@ietf.org >>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>> >>>>>>>> -- >>>>>> Webtransport mailing list >>>>>> Webtransport@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>> >>>>> -- >>>>> Webtransport mailing list >>>>> Webtransport@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>> >>>> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > --0000000000000143cf05b44328dc Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    I'd like us to take a step back, I think we're con= flating many different topics here, and it's making it impossible to re= ason about this (at least for someone running on not enough sleep like I am= this week).

    Topic 1: the complexity of implementing=C2= =A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the client
    =
    =C2=A0 =C2=A0 From my perspective, all browsers interested in WebTrans= port are implementing HTTP/3, so I don't see much complexity there.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm = not seeing

    Topic 2: the complexity of impleme= nting=C2=A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the serv= er
    =C2=A0 =C2=A0 As far as I know, most server-side QUIC st= acks also support HTTP/3, and for QuicTransport=C2=A0they already have DATA= GRAM support so I think the delta is negligible.
    =C2=A0 =C2=A0 Pl= ease reply here if you know of complexities I'm not seeing

    Topic 3: the benefits of pooling WebTransport
    =
    =C2=A0 =C2=A0 This allows saving round trips to get WebTransport up an= d running
    =C2=A0 =C2=A0 This allows sharing congestion control st= ate
    =C2=A0 =C2=A0 This allows letting the QUIC implementation pri= oritize DATAGRAMs vs HTTP requests instead of relying on the kernel or rout= ers which have less information
    =C2=A0 =C2=A0 Overall, I think po= oling is beneficial (though not an absolute must-have)
    =C2=A0 =C2= =A0 Please reply here if you know of benefits I'm not seeing
    <= div>
    Topic 4: the difficulty of pooling Http3Transport=C2=A0o= n the client
    =C2=A0 =C2=A0 It appears that all browsers that are = interested in WebTransport are implementing pooling in their HTTP/3 stack s= o additionally pooling WebTransport should not introduce more complexity
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm= not seeing

    Topic 5: the difficult= y of pooling Http3Transport=C2=A0on the server
    =C2=A0 =C2= =A0 This one is trickier. If you have frontends that know how to route HTTP= =C2=A0requests to backends, DATAGRAM support is going to be a whole new wor= ld.
    =C2=A0 =C2=A0 However, and I think this is really important: = implementing this on the server is OPTIONAL.
    =C2=A0 =C2=A0 The se= rver can easily use a different hostname (and different TLS certificates) f= or HTTP vs WebTransport and clients will not pool the two together.
    =C2=A0 =C2=A0 Once you use different domain names per WebTransport objec= t, Http3Transport=C2=A0has the exact same pooling properties as QuicTranspo= rt.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I= 'm not seeing

    What am I missing?

    Thanks,
    David


    On Mon, Nov 16,= 2020 at 4:45 PM Ian Swett <iansw= ett@google.com> wrote:
    I'm very concerned about any func= tionality that requires pooling.=C2=A0 Pooling is a client-specific = optimization and pooling policy is subject to change(within reason) at any = time.=C2=A0 If applications=C2=A0are saying "it'd be cool if we co= uld share congestion control and loss recovery state between H3 and WebTran= sport most of the time", then I can see there being real(albeit small)= benefits, just like there would be for putting DataChannels and RTP into o= ne QUIC connection for WebRTC.=C2=A0 If people are intending to rely on poo= ling so an HTTP(hopefully H3) request can trigger a WebTransport response, = I think we're in a world of pain and over-optimization.

    <= div>This is more obvious in light of the fact that a WebTransport endpoint= =C2=A0is likely not a generic CDN endpoint, as has been clearly stated by M= ark Nottingham.

    Bernard's comments above point t= o a tighter coupling between HTTP/3 and WebTransport than I think is practi= cal in production, unless I misunderstood(which I may have, it's been a= long day).

    All of this makes me think we should p= unt the HTTP based WebTransport options down the road a year or so and focu= s on QuicTransport=C2=A0initially.=C2=A0 It's not to say we won't d= o them, but they're clearly more complex than=C2=A0QuicTransport=C2=A0a= nd it'd be good to have real deployment experience prior to starting so= we know what the requirements are and where the dragons are lurking.=C2=A0= Also, the W3C should design APIs that make it easy to detect failure to es= tablish a QUIC-based=C2=A0WebTransport, and this ensures those are well exe= rcised.=C2=A0 Maybe we DO require pooling under certain conditions and desc= ribe those, but there are likely privacy concerns under some circumstances = and I'm not enough of an expert to know what would be acceptable to all= clients.

    Some=C2=A0people in the WG may think we = have to release a TCP based WebTransport at the same time as a QUIC based o= ne, but I don't think that's true and even if we standardized them = at the same time, it doesn't mean both will achieve wide deployment at = the same time.=C2=A0 As I said at the mic, I don't see any reason YouTu= be would deploy a TCP based WebTransport given it will have to maintain an = HTTP/1.1 option for basically forever and they've spent a good bit of e= ffort to make sure that works as well as it can.=C2=A0 It's clear to me= there are compelling use cases right now for QuicTransport, but=C2=A0the d= riving use cases for the fallback are not clear to me.=C2=A0 Consistency is= intellectually appealing, but doesn't drive deployments.

    Ian

    On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba &l= t;bernard.abob= a@gmail.com> wrote:
    David said:= =C2=A0

    "Where does this come from? A lot of QUIC se= rvers are implementing QUIC datagrams, and once you have those the delta wi= th h3 datagrams is negligible. Additionally, multiple h3 server implementer= s=C2=A0have indicated they want to support WebTransport. It's starting = to feel like the pushback on HTTP3Transport=C2=A0is purely based on a perce= ption of complexity from folks who haven't tried to implement it? If th= at's the case, then we should get some implementation experience to con= firm or debunk that theory."

    [BA] The pooling= use cases often involve an interaction between an HTTP/3 request/response = and WebTransport.=C2=A0 so the HTTP/3 Request doesn't just elicit an HT= TP/3 Response.=C2=A0 It also causes something else to happen, something tha= t isn't specified in the HTTP/3 protocol, such as eliciting a datagram = flow or bi/unidirectional stream from the server.=C2=A0 This is what is con= templated in several of the "Live Event" use cases, where the HTT= P/3 Request/Response would be requesting the desired Event. The major advan= tage over HLS is avoiding Head-of-Line blocking, reducing video freezes and= stalls.=C2=A0 So developers understand the value that support for datagram= s and server-initiated streams can provide - the question is whether they&#= 39;ll have all the interoperable pieces in place to deploy it.=C2=A0
    =

    Just because a generic HTTP/3 server supports QUIC and = WebTransport, doesn't mean that it will support these use cases.=C2=A0 = I've been asked whether better interoperability and wider ecosystem sup= port could be achieved by extending HTTP/3 in a way more in keeping with th= e existing protocol design - such as by allowing an HTTP/3 Request to speci= fy a resource to be returned in a flow of datagrams.=C2=A0

    The situation might be more tenable if the node.js framework had H= TTP/3 and QUIC modules on the horizon.

    On Mon, Nov 16,= 2020 at 1:00 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba <bernard.aboba@gmail.com&= gt; wrote:
    Luke said:=C2=A0

    "My primary concern is that Http3Transport requires non-generi= c modifications to the HTTP/3 layer mostly to support connection pooling. I= 'm worried that this will limit support for Http3Transport and complica= tes any HTTP/3 implementation that does support it."
    =
    [BA] I have also heard this concern from developers. The con= cerns primarily arise from the pooling of HTTP/3 Request/Responses with Web= Transport. This does enable some interesting use cases, such as a Request/R= esponse (e.g. gRPC) that can result in a server sending datagrams or initia= ting bi-directional or uni-directional streams.=C2=A0 So there is perceived= value, but the question is whether that value will be widely supported acr= oss the HTTP/3 ecosystem.=C2=A0

    At this point, mos= t generic HTTP/3 servers are not expected to support HTTP/3 datagrams (not = part of the HTTP/3 protocol) or Http3Transport (perceived as a niche protoc= ol), so that pooling would only be possible when using a framework.=C2=A0 n= ode.js will not have=C2=A0QUIC support for 12-18 months (held up by OpenSSL= ) so even framework support is expected to be limited.

    Where does this come from? A lot of QUIC servers ar= e implementing QUIC datagrams, and once you have those the delta with h3 da= tagrams is negligible. Additionally, multiple h3 server implementers=C2=A0h= ave indicated they want to support WebTransport. It's starting to feel = like the pushback on HTTP3Transport=C2=A0is purely based on a perception of= complexity from folks who haven't tried to implement it? If that's= the case, then we should get some implementation experience to confirm or = debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David Schinazi <dschinazi.ietf@gmail.com&= gt; wrote:


    On Mon, Nov 16, 2020 at 11:34 AM Luke Curl= ey <kixelated@g= mail.com> wrote:
    We're on the same page that there's code i= n HTTP/3 that could be leveraged for QuicTransport in the form of the heade= r parsing. I think there's a path to merge QuicTransport and Http3Trans= port by leveraging HTTP/3 for the handshake and QUIC for stream delivery.
    My primary concern is that Http3Transport requires non-ge= neric modifications to the HTTP/3 layer mostly to support connection poolin= g. I'm worried that this will limit support for Http3Transport and comp= licates any HTTP/3 implementation that does support it.

    Hi Luke,

    I'm curious,= could you elaborate on what these "non-generic modifications to the H= TTP/3 layer" are please?

    Thanks,
    Da= vid
    =C2=A0
    On Mon, N= ov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com> wrote:
    <= /div>
    Hi Luke,

    On Mon, 16 Nov 2020, 12:26 Luke C= urley, <kixelat= ed@gmail.com> wrote:
    Just to clarify, when I say "QuicTra= nsport is simpler" I really mean "QuicTransport has greater inter= operability". You can take any QUIC implementation (+ datagram extensi= on) and add a thin layer to support QuicTransport. It's a nice layering= of protocols and it's something that I want to see in general as QUIC = replaces TCP.

    Thanks for the clarification. I appreciate the sentime= nt. But given the development of QUIC its kind of surprising that people wo= uld find it easier to identify an implementation that supports QUIC and dat= agram but does not support HTTP/3.

    Thr situation for a more clean-room implementation is different,= I agree. However, by the time you've done all the hard stuff with QUIC= , a very focused HTTP/3 layer ends up quite thin too. You can ignore dynami= c compression, server push and extensibility points.

    I also see the current design being the thin e= nd of the wedge. The proposal I linked talks about HTTP-like header parsing= . So its "just" a thin layer to do some parsing. Then folks will = probably want some want to tweak parameter, acontrol channel, a way to do g= raceful close, a sprinkle of GREASE. To extrapolate forward, what would be = the delta be between some final product QuicTransport and HTTP/3. Too small= a delta and we've wasted years of effort.

    <= /div>
    Cheers
    Lucas



    O= n Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <lucaspardue.24.7@gm= ail.com> wrote:
    Hi folks,

    To follow u= p on one thread of discussion during IETF 109. To over simplify what we'= ;ve heard a few folks say, they prefer QuicTransport because it simpler and= they don't need pooling.

    I'd like to push= more on this, what is the measurable complexity of HTTP/3 over QUIC plus a= new application mapping that needs to be defined? Let's isolate poolin= g as a variable and ignore it.

    Victor mentioned hi= s proposal for a unified header semantic across all transports, this is https://github.com/ietf-wg= -webtrans/draft-ietf-webtrans-overview/pull/4/files. Taking a closer lo= ok at it, I have some concerns that I added as comments. HTTP has semantic= s for a reason. If QuicTransport is going to start borrowing HTTP piecemeal= , I really wonder how simple people might feel it is. I think it's impo= rtant to avoid something that looks like HTTP but behaves differently. Is i= t really much of a stretch to just do HTTP/3 but give it a different ALPN s= o that we avoid problems related to cross-protocol pooling?

    <= /div>
    Cheers,
    Lucas
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --0000000000000143cf05b44328dc-- From nobody Mon Nov 16 18:00:19 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id BAE1F3A1872 for ; Mon, 16 Nov 2020 18:00:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id yLdjIA2qUQRN for ; Mon, 16 Nov 2020 18:00:14 -0800 (PST) Received: from mail-ej1-x631.google.com (mail-ej1-x631.google.com [IPv6:2a00:1450:4864:20::631]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 10A513A186D for ; Mon, 16 Nov 2020 18:00:13 -0800 (PST) Received: by mail-ej1-x631.google.com with SMTP id oq3so27216956ejb.7 for ; Mon, 16 Nov 2020 18:00:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=RTM4WjExXYwVE8pVNuwgC7/1DQo1M5cHHboAAznnAP4=; b=dVnhMyYyQlOZ5TbQxathK5tPPcxYUh2tpBqiyloMrAV88sBD1VjIFo99lA1hL1QfLH lnWy2pcB2lDEEAgb515jnSfv43zH3XYgG8hvoq4eIAgA/4CE5Mf1fr+Em3cVbmD3WB6y rNYYD3vObsdFP7EcVR6kmLu/SgZYu6BiVbh9MWaiTRxev9HDIN59E7rJ1OQ7NnjttTOG LLboso6WuAy5x79o4haKL2OPX+Z5K3WG5rjrCYT1eMfQLJos3MGpsbl/ZRhW9Kpn2L1L 51RntObv8Xp7397lz7BUF2OBQ9h3drh9DM9bZxg5a03AUmj34zvw/VvOZGYlIG5WPrB2 Llkw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=RTM4WjExXYwVE8pVNuwgC7/1DQo1M5cHHboAAznnAP4=; b=UnWb8JbFvgtlM7sdGlC98spqSbyDWfWAWvQIAQ25Tf3/w2rgeZnky1qIGQ1VVUDkOt cNK7BVP501bWMLWQbyZ1bc6pRqBybhA2rd1Z+yrFx35G5Td2xYjF7OS5OEQ/r5nF9eiR uaWG4WQrBWRR/ivnFb12+2XFOfS1ttqoaccGCTDhoVEDZVNt1ELOStAiVFR2IoEA4p1L B6B74qiFj9gv0SNFC43MUseQG9Obq+Y5EUAB112MCJIuIC3ZsnLomcFlytfjwuzAXAGB rrG8achcgDiw1xnJFXnuDf2IIerzwZraQcG7OATOdK7uTaqQCYUCT5f4KAiUmXh/hIJl 7qmQ== X-Gm-Message-State: AOAM533BeFT+VaBb28Gc625WQpPO7J3WQWhblcITQLe8v6pYv5dQBH2c onAvA4tFunCH4tVqskmnxhoi1B9ys3gxnKeXWm0= X-Google-Smtp-Source: ABdhPJyMvLXaZLHUqNRWyjDtkJ0Wv5g1dFduTYb9ieBxOocgbVKl0HeAqmWDhP6JyEwF5YKrjUkXvncG4LfCg85C1u4= X-Received: by 2002:a17:906:4704:: with SMTP id y4mr8664227ejq.449.1605578412170; Mon, 16 Nov 2020 18:00:12 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Kazuho Oku Date: Tue, 17 Nov 2020 11:00:00 +0900 Message-ID: To: David Schinazi Cc: Ian Swett , WebTransport , Luke Curley , Lucas Pardue , Bernard Aboba Content-Type: multipart/alternative; boundary="000000000000ea9ff905b443da62" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 02:00:18 -0000 --000000000000ea9ff905b443da62 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable David, thank you for breaking down the topics. My responses inline. 2020=E5=B9=B411=E6=9C=8817=E6=97=A5(=E7=81=AB) 10:10 David Schinazi : > I'd like us to take a step back, I think we're conflating many different > topics here, and it's making it impossible to reason about this (at least > for someone running on not enough sleep like I am this week). > > Topic 1: the complexity of implementing Http3Transport as opposed to > QuicTransport on the client > From my perspective, all browsers interested in WebTransport are > implementing HTTP/3, so I don't see much complexity there. > Please reply here if you know of complexities I'm not seeing > > Topic 2: the complexity of implementing Http3Transport as opposed to > QuicTransport on the server > As far as I know, most server-side QUIC stacks also support HTTP/3, > and for QuicTransport they already have DATAGRAM support so I think the > delta is negligible. > Please reply here if you know of complexities I'm not seeing > I might insert: Topic 2b: the complexity of implementing QuicTransport as opposed to Http3Transport on the server. IIUC, status quo of QuicTransport is much like HTTP/0.9, that upgrades the connection to use datagrams once the server acknowledges the request. By saying HTTP/0.9, I am pointing out that there are no header fields, and the problem is that things like authentication are missing, as Lucas pointed out elsewhere. >From the perspective of a HTTP server-side deployment that intends to support WebTransport, it would be helpful if the handshake used HTTP request-response, because then we could reuse all the stuff that we have for HTTP. I think doing so has been helpful with websockets. I do understand the concern that wire encoding of HTTP/3 seems complicated to people who are only interested in implementing WebTransport. We should try to accommodate that concern. However, I think there's value in adopting the semantics of HTTP [1] to the handshake of WebTransport, and that the natural path forward would be to use (a subset of) HTTP/3 for the purpose. > Topic 3: the benefits of pooling WebTransport > This allows saving round trips to get WebTransport up and running > This allows sharing congestion control state > This allows letting the QUIC implementation prioritize DATAGRAMs vs > HTTP requests instead of relying on the kernel or routers which have less > information > Overall, I think pooling is beneficial (though not an absolute > must-have) > Please reply here if you know of benefits I'm not seeing > > Topic 4: the difficulty of pooling Http3Transport on the client > It appears that all browsers that are interested in WebTransport are > implementing pooling in their HTTP/3 stack so additionally pooling > WebTransport should not introduce more complexity > Please reply here if you know of complexities I'm not seeing > > Topic 5: the difficulty of pooling Http3Transport on the server > This one is trickier. If you have frontends that know how to route > HTTP requests to backends, DATAGRAM support is going to be a whole new > world. > However, and I think this is really important: implementing this on > the server is OPTIONAL. > The server can easily use a different hostname (and different TLS > certificates) for HTTP vs WebTransport and clients will not pool the two > together. > Once you use different domain names per WebTransport object, > Http3Transport has the exact same pooling properties as QuicTransport. > Please reply here if you know of complexities I'm not seeing > I think pooling is optional to both the client and server, regardless of the protocol that we choose. That was the case for websockets until RFC 8441 was standardized, and even after that, endpoints have the option to use dedicated connection. [1] https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html > What am I missing? > > Thanks, > David > > > On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: > >> I'm *very* concerned about any functionality that *requires* pooling. >> Pooling is a client-specific optimization and pooling policy is subject = to >> change(within reason) at any time. If applications are saying "it'd be >> cool if we could share congestion control and loss recovery state betwee= n >> H3 and WebTransport most of the time", then I can see there being >> real(albeit small) benefits, just like there would be for putting >> DataChannels and RTP into one QUIC connection for WebRTC. If people are >> intending to rely on pooling so an HTTP(hopefully H3) request can trigge= r a >> WebTransport response, I think we're in a world of pain and >> over-optimization. >> >> This is more obvious in light of the fact that a WebTransport endpoint i= s >> likely not a generic CDN endpoint, as has been clearly stated by Mark >> Nottingham. >> >> Bernard's comments above point to a tighter coupling between HTTP/3 and >> WebTransport than I think is practical in production, unless I >> misunderstood(which I may have, it's been a long day). >> >> All of this makes me think we should punt the HTTP based WebTransport >> options down the road a year or so and focus on QuicTransport initially. >> It's not to say we won't do them, but they're clearly more complex >> than QuicTransport and it'd be good to have real deployment experience >> prior to starting so we know what the requirements are and where the >> dragons are lurking. Also, the W3C should design APIs that make it easy= to >> detect failure to establish a QUIC-based WebTransport, and this ensures >> those are well exercised. Maybe we DO require pooling under certain >> conditions and describe those, but there are likely privacy concerns und= er >> some circumstances and I'm not enough of an expert to know what would be >> acceptable to all clients. >> >> Some people in the WG may think we have to release a TCP based >> WebTransport at the same time as a QUIC based one, but I don't think tha= t's >> true and even if we standardized them at the same time, it doesn't mean >> both will achieve wide deployment at the same time. As I said at the mi= c, >> I don't see any reason YouTube would deploy a TCP based WebTransport giv= en >> it will have to maintain an HTTP/1.1 option for basically forever and >> they've spent a good bit of effort to make sure that works as well as it >> can. It's clear to me there are compelling use cases right now for >> QuicTransport, but the driving use cases for the fallback are not clear = to >> me. Consistency is intellectually appealing, but doesn't drive deployme= nts. >> >> Ian >> >> On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba >> wrote: >> >>> David said: >>> >>> "Where does this come from? A lot of QUIC servers are implementing QUIC >>> datagrams, and once you have those the delta with h3 datagrams is >>> negligible. Additionally, multiple h3 server implementers have indicate= d >>> they want to support WebTransport. It's starting to feel like the pushb= ack >>> on HTTP3Transport is purely based on a perception of complexity from fo= lks >>> who haven't tried to implement it? If that's the case, then we should g= et >>> some implementation experience to confirm or debunk that theory." >>> >>> [BA] The pooling use cases often involve an interaction between an >>> HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn'= t >>> just elicit an HTTP/3 Response. It also causes something else to happe= n, >>> something that isn't specified in the HTTP/3 protocol, such as elicitin= g a >>> datagram flow or bi/unidirectional stream from the server. This is wha= t is >>> contemplated in several of the "Live Event" use cases, where the HTTP/3 >>> Request/Response would be requesting the desired Event. The major advan= tage >>> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >>> stalls. So developers understand the value that support for datagrams = and >>> server-initiated streams can provide - the question is whether they'll = have >>> all the interoperable pieces in place to deploy it. >>> >>> Just because a generic HTTP/3 server supports QUIC and WebTransport, >>> doesn't mean that it will support these use cases. I've been asked whe= ther >>> better interoperability and wider ecosystem support could be achieved b= y >>> extending HTTP/3 in a way more in keeping with the existing protocol de= sign >>> - such as by allowing an HTTP/3 Request to specify a resource to be >>> returned in a flow of datagrams. >>> >>> The situation might be more tenable if the node.js framework had HTTP/3 >>> and QUIC modules on the horizon. >>> >>> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi >>> wrote: >>> >>>> >>>> >>>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba >>>> wrote: >>>> >>>>> Luke said: >>>>> >>>>> "My primary concern is that Http3Transport requires non-generic >>>>> modifications to the HTTP/3 layer mostly to support connection poolin= g. I'm >>>>> worried that this will limit support for Http3Transport and complicat= es any >>>>> HTTP/3 implementation that does support it." >>>>> >>>>> [BA] I have also heard this concern from developers. The concerns >>>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>>> WebTransport. This does enable some interesting use cases, such as a >>>>> Request/Response (e.g. gRPC) that can result in a server sending data= grams >>>>> or initiating bi-directional or uni-directional streams. So there is >>>>> perceived value, but the question is whether that value will be widel= y >>>>> supported across the HTTP/3 ecosystem. >>>>> >>>>> At this point, most generic HTTP/3 servers are not expected to suppor= t >>>>> HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport >>>>> (perceived as a niche protocol), so that pooling would only be possib= le >>>>> when using a framework. node.js will not have QUIC support for 12-18 >>>>> months (held up by OpenSSL) so even framework support is expected to = be >>>>> limited. >>>>> >>>> >>>> Where does this come from? A lot of QUIC servers are implementing QUIC >>>> datagrams, and once you have those the delta with h3 datagrams is >>>> negligible. Additionally, multiple h3 server implementers have indicat= ed >>>> they want to support WebTransport. It's starting to feel like the push= back >>>> on HTTP3Transport is purely based on a perception of complexity from f= olks >>>> who haven't tried to implement it? If that's the case, then we should = get >>>> some implementation experience to confirm or debunk that theory. >>>> >>>> >>>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>>> dschinazi.ietf@gmail.com> wrote: >>>>> >>>>>> >>>>>> >>>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>>> wrote: >>>>>> >>>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>>> leveraged for QuicTransport in the form of the header parsing. I th= ink >>>>>>> there's a path to merge QuicTransport and Http3Transport by leverag= ing >>>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>>> >>>>>>> My primary concern is that Http3Transport requires non-generic >>>>>>> modifications to the HTTP/3 layer mostly to support connection pool= ing. I'm >>>>>>> worried that this will limit support for Http3Transport and complic= ates any >>>>>>> HTTP/3 implementation that does support it. >>>>>>> >>>>>> >>>>>> Hi Luke, >>>>>> >>>>>> I'm curious, could you elaborate on what these "non-generic >>>>>> modifications to the HTTP/3 layer" are please? >>>>>> >>>>>> Thanks, >>>>>> David >>>>>> >>>>>> >>>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>> >>>>>>>> Hi Luke, >>>>>>>> >>>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really >>>>>>>>> mean "QuicTransport has greater interoperability". You can take a= ny QUIC >>>>>>>>> implementation (+ datagram extension) and add a thin layer to sup= port >>>>>>>>> QuicTransport. It's a nice layering of protocols and it's somethi= ng that I >>>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>>> >>>>>>>> >>>>>>>> Thanks for the clarification. I appreciate the sentiment. But give= n >>>>>>>> the development of QUIC its kind of surprising that people would f= ind it >>>>>>>> easier to identify an implementation that supports QUIC and datagr= am but >>>>>>>> does not support HTTP/3. >>>>>>>> >>>>>>>> Thr situation for a more clean-room implementation is different, I >>>>>>>> agree. However, by the time you've done all the hard stuff with QU= IC, a >>>>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore d= ynamic >>>>>>>> compression, server push and extensibility points. >>>>>>>> >>>>>>>> I also see the current design being the thin end of the wedge. The >>>>>>>> proposal I linked talks about HTTP-like header parsing. So its "ju= st" a >>>>>>>> thin layer to do some parsing. Then folks will probably want some = want to >>>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a s= prinkle >>>>>>>> of GREASE. To extrapolate forward, what would be the delta be betw= een some >>>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we'v= e wasted >>>>>>>> years of effort. >>>>>>>> >>>>>>>> Cheers >>>>>>>> Lucas >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> Hi folks, >>>>>>>>>> >>>>>>>>>> To follow up on one thread of discussion during IETF 109. To ove= r >>>>>>>>>> simplify what we've heard a few folks say, they prefer QuicTrans= port >>>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>>> >>>>>>>>>> I'd like to push more on this, what is the measurable complexity >>>>>>>>>> of HTTP/3 over QUIC plus a new application mapping that needs to= be >>>>>>>>>> defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>>> >>>>>>>>>> Victor mentioned his proposal for a unified header semantic >>>>>>>>>> across all transports, this is >>>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview= /pull/4/files. >>>>>>>>>> Taking a closer look at it, I have some concerns that I added as= comments. >>>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to st= art >>>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people migh= t feel it >>>>>>>>>> is. I think it's important to avoid something that looks like HT= TP but >>>>>>>>>> behaves differently. Is it really much of a stretch to just do H= TTP/3 but >>>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>>> cross-protocol pooling? >>>>>>>>>> >>>>>>>>>> Cheers, >>>>>>>>>> Lucas >>>>>>>>>> -- >>>>>>>>>> Webtransport mailing list >>>>>>>>>> Webtransport@ietf.org >>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>> >>>>>>>>> -- >>>>>>> Webtransport mailing list >>>>>>> Webtransport@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>> >>>>>> -- >>>>>> Webtransport mailing list >>>>>> Webtransport@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>> >>>>> -- >>> Webtransport mailing list >>> Webtransport@ietf.org >>> https://www.ietf.org/mailman/listinfo/webtransport >>> >> -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --=20 Kazuho Oku --000000000000ea9ff905b443da62 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    David, thank you for breaking down the topics.
    <= div>
    My responses inline.

    2020=E5=B9=B411=E6=9C=8817=E6=97= =A5(=E7=81=AB) 10:10 David Schinazi <dschinazi.ietf@gmail.com>:
    I'd like us to take a step = back, I think we're conflating many different topics here, and it's= making it impossible to reason about this (at least for someone running on= not enough sleep like I am this week).

    Topic 1: the com= plexity of implementing=C2=A0Http3Transport=C2=A0as opposed to QuicTranspor= t=C2=A0on the client
    =C2=A0 =C2=A0 From my perspective, all brows= ers interested in WebTransport are implementing HTTP/3, so I don't see = much complexity there.
    =C2=A0 =C2=A0 Please reply here if you kno= w of complexities I'm not seeing

    Topic 2:= the complexity of implementing=C2=A0Http3Transport=C2=A0as opposed to Quic= Transport=C2=A0on the server
    =C2=A0 =C2=A0 As far as I know= , most server-side QUIC stacks also support HTTP/3, and for QuicTransport= =C2=A0they already have DATAGRAM support so I think the delta is negligible= .
    =C2=A0 =C2=A0 Please reply here if you know of complexities I&#= 39;m not seeing

    I might insert:=

    Topic 2b: the complexity of implementing QuicTran= sport as opposed to Http3Transport on the server.

    = IIUC, status quo of QuicTransport is much like HTTP/0.9, that upgrades the = connection to use datagrams once the server acknowledges the request.
    =

    By saying HTTP/0.9, I am pointing out that there are no= header fields, and the problem is that things like authentication are miss= ing, as Lucas pointed out elsewhere.

    From the = perspective of a HTTP server-side deployment that intends to support WebTra= nsport, it would be helpful if the handshake used HTTP request-response, be= cause then we could reuse all the stuff that we have for HTTP. I think doin= g so has been helpful with websockets.

    I do unders= tand the concern that wire encoding of HTTP/3 seems complicated to people w= ho are only interested in implementing WebTransport. We should try to accom= modate that concern. However, I think there's value in adopting the sem= antics of HTTP [1] to the handshake of WebTransport, and that the natural p= ath forward would be to use (a subset of) HTTP/3 for the purpose.
    =


    Topic 3: the benefits of pooling We= bTransport
    =C2=A0 =C2=A0 This allows saving round trips to get We= bTransport up and running
    =C2=A0 =C2=A0 This allows sharing conge= stion control state
    =C2=A0 =C2=A0 This allows letting the QUIC im= plementation prioritize DATAGRAMs vs HTTP requests instead of relying on th= e kernel or routers which have less information
    =C2=A0 =C2=A0 Ove= rall, I think pooling is beneficial (though not an absolute must-have)
    =C2=A0 =C2=A0 Please reply here if you know of benefits I'm not s= eeing

    Topic 4: the difficulty of pooling Http3= Transport=C2=A0on the client
    =C2=A0 =C2=A0 It appears that all br= owsers that are interested in WebTransport are implementing pooling in thei= r HTTP/3 stack so additionally pooling WebTransport should not introduce mo= re complexity
    =C2=A0 =C2=A0 Please reply here if you know of comp= lexities I'm not seeing

    Topic = 5: the difficulty of pooling Http3Transport=C2=A0on the server
    <= div>=C2=A0 =C2=A0 This one is trickier. If you have frontends that know how= to route HTTP=C2=A0requests to backends, DATAGRAM support is going to be a= whole new world.
    =C2=A0 =C2=A0 However, and I think this is real= ly important: implementing this on the server is OPTIONAL.
    =C2=A0= =C2=A0 The server can easily use a different hostname (and different TLS c= ertificates) for HTTP vs WebTransport and clients will not pool the two tog= ether.
    =C2=A0 =C2=A0 Once you use different domain names per WebT= ransport object, Http3Transport=C2=A0has the exact same pooling properties = as QuicTransport.
    =C2=A0 =C2=A0 Please reply here if you know of = complexities I'm not seeing

    =
    I think pooling is optional to both the client and server, regardless = of the protocol that we choose. That was the case for websockets until RFC = 8441 was standardized, and even after that, endpoints have the option to us= e dedicated connection.

    <= br>

    What am I missing?

    Thanks,
    David


    On Mon, Nov 16, 2020 at 4:45 P= M Ian Swett <ia= nswett@google.com> wrote:
    I'm very concerned about any f= unctionality that requires pooling.=C2=A0 Pooling is a client-specif= ic optimization and pooling policy is subject to change(within reason) at a= ny time.=C2=A0 If applications=C2=A0are saying "it'd be cool if we= could share congestion control and loss recovery state between H3 and WebT= ransport most of the time", then I can see there being real(albeit sma= ll) benefits, just like there would be for putting DataChannels and RTP int= o one QUIC connection for WebRTC.=C2=A0 If people are intending to rely on = pooling so an HTTP(hopefully H3) request can trigger a WebTransport respons= e, I think we're in a world of pain and over-optimization.

    This is more obvious in light of the fact that a WebTransport endpoi= nt=C2=A0is likely not a generic CDN endpoint, as has been clearly stated by= Mark Nottingham.

    Bernard's comments above point= to a tighter coupling between HTTP/3 and WebTransport than I think is prac= tical in production, unless I misunderstood(which I may have, it's been= a long day).

    All of this makes me think we should= punt the HTTP based WebTransport options down the road a year or so and fo= cus on QuicTransport=C2=A0initially.=C2=A0 It's not to say we won't= do them, but they're clearly more complex than=C2=A0QuicTransport=C2= =A0and it'd be good to have real deployment experience prior to startin= g so we know what the requirements are and where the dragons are lurking.= =C2=A0 Also, the W3C should design APIs that make it easy to detect failure= to establish a QUIC-based=C2=A0WebTransport, and this ensures those are we= ll exercised.=C2=A0 Maybe we DO require pooling under certain conditions an= d describe those, but there are likely privacy concerns under some circumst= ances and I'm not enough of an expert to know what would be acceptable = to all clients.

    Some=C2=A0people in the WG may thi= nk we have to release a TCP based WebTransport at the same time as a QUIC b= ased one, but I don't think that's true and even if we standardized= them at the same time, it doesn't mean both will achieve wide deployme= nt at the same time.=C2=A0 As I said at the mic, I don't see any reason= YouTube would deploy a TCP based WebTransport given it will have to mainta= in an HTTP/1.1 option for basically forever and they've spent a good bi= t of effort to make sure that works as well as it can.=C2=A0 It's clear= to me there are compelling use cases right now for QuicTransport, but=C2= =A0the driving use cases for the fallback are not clear to me.=C2=A0 Consis= tency is intellectually appealing, but doesn't drive deployments.
    =

    Ian

    On Mon, Nov 16, 2020 at 6:36 PM Bernard = Aboba <bern= ard.aboba@gmail.com> wrote:
    David= said:=C2=A0

    "Where does this come from? A lot of Q= UIC servers are implementing QUIC datagrams, and once you have those the de= lta with h3 datagrams is negligible. Additionally, multiple h3 server imple= menters=C2=A0have indicated they want to support WebTransport. It's sta= rting to feel like the pushback on HTTP3Transport=C2=A0is purely based on a= perception of complexity from folks who haven't tried to implement it?= If that's the case, then we should get some implementation experience = to confirm or debunk that theory."

    [BA] The p= ooling use cases often involve an interaction between an HTTP/3 request/res= ponse and WebTransport.=C2=A0 so the HTTP/3 Request doesn't just elicit= an HTTP/3 Response.=C2=A0 It also causes something else to happen, somethi= ng that isn't specified in the HTTP/3 protocol, such as eliciting a dat= agram flow or bi/unidirectional stream from the server.=C2=A0 This is what = is contemplated in several of the "Live Event" use cases, where t= he HTTP/3 Request/Response would be requesting the desired Event. The major= advantage over HLS is avoiding Head-of-Line blocking, reducing video freez= es and stalls.=C2=A0 So developers understand the value that support for da= tagrams and server-initiated streams can provide - the question is whether = they'll have all the interoperable pieces in place to deploy it.=C2=A0 =

    Just because a generic HTTP/3 server supports QUI= C and WebTransport, doesn't mean that it will support these use cases.= =C2=A0 I've been asked whether better interoperability and wider ecosys= tem support could be achieved by extending HTTP/3 in a way more in keeping = with the existing protocol design - such as by allowing an HTTP/3 Request t= o specify a resource to be returned in a flow of datagrams.=C2=A0

    The situation might be more tenable if the node.js framewor= k had HTTP/3 and QUIC modules on the horizon.
    On Mon, = Nov 16, 2020 at 1:00 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba <bernard.aboba@gmail.c= om> wrote:
    Luke said:=C2=A0

    "My primary concern is that Http3Transport requires non= -generic modifications to the HTTP/3 layer mostly to support connection poo= ling. I'm worried that this will limit support for Http3Transport and c= omplicates any HTTP/3 implementation that does support it."

    [BA] I have also heard this concern from developers. = The concerns primarily arise from the pooling of HTTP/3 Request/Responses w= ith WebTransport. This does enable some interesting use cases, such as a Re= quest/Response (e.g. gRPC) that can result in a server sending datagrams or= initiating bi-directional or uni-directional streams.=C2=A0 So there is pe= rceived value, but the question is whether that value will be widely suppor= ted across the HTTP/3 ecosystem.=C2=A0

    At this poi= nt, most generic HTTP/3 servers are not expected to support HTTP/3 datagram= s (not part of the HTTP/3 protocol) or Http3Transport (perceived as a niche= protocol), so that pooling would only be possible when using a framework.= =C2=A0 node.js will not have=C2=A0QUIC support for 12-18 months (held up by= OpenSSL) so even framework support is expected to be limited.
    <= /blockquote>

    Where does this come from? A lot of QUIC se= rvers are implementing QUIC datagrams, and once you have those the delta wi= th h3 datagrams is negligible. Additionally, multiple h3 server implementer= s=C2=A0have indicated they want to support WebTransport. It's starting = to feel like the pushback on HTTP3Transport=C2=A0is purely based on a perce= ption of complexity from folks who haven't tried to implement it? If th= at's the case, then we should get some implementation experience to con= firm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David Schinazi <dschinazi.ietf@gmail= .com> wrote:


    On Mon, Nov 16, 2020 at 11:34 AM = Luke Curley <ki= xelated@gmail.com> wrote:
    We're on the same page that there'= ;s code in HTTP/3 that could be leveraged for QuicTransport in the form of = the header parsing. I think there's a path to merge QuicTransport and H= ttp3Transport by leveraging HTTP/3 for the handshake and QUIC for stream de= livery.

    My primary concern is that Http3Transport requir= es non-generic modifications to the HTTP/3 layer mostly to support connecti= on pooling. I'm worried that this will limit support for Http3Transport= and complicates any HTTP/3 implementation that does support it.

    Hi Luke,

    I'm= curious, could you elaborate on what these "non-generic modifications= to the HTTP/3 layer" are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com> w= rote:
    Hi Luke,

    On Mon, 16 Nov 2020, = 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clarify, when I say &= quot;QuicTransport is simpler" I really mean "QuicTransport has g= reater interoperability". You can take any QUIC implementation (+ data= gram extension) and add a thin layer to support QuicTransport. It's a n= ice layering of protocols and it's something that I want to see in gene= ral as QUIC replaces TCP.

    Thanks for the clarification. I appreciate= the sentiment. But given the development of QUIC its kind of surprising th= at people would find it easier to identify an implementation that supports = QUIC and datagram but does not support HTTP/3.

    <= /div>
    Thr situation for a more clean-room implementation i= s different, I agree. However, by the time you've done all the hard stu= ff with QUIC, a very focused HTTP/3 layer ends up quite thin too. You can i= gnore dynamic compression, server push and extensibility points.

    I also see the current design bein= g the thin end of the wedge. The proposal I linked talks about HTTP-like he= ader parsing. So its "just" a thin layer to do some parsing. Then= folks will probably want some want to tweak parameter, acontrol channel, a= way to do graceful close, a sprinkle of GREASE. To extrapolate forward, wh= at would be the delta be between some final product QuicTransport and HTTP/= 3. Too small a delta and we've wasted years of effort.

    Cheers
    Lucas


    =

    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <lucaspard= ue.24.7@gmail.com> wrote:
    Hi folks,

    T= o follow up on one thread of discussion during IETF 109. To over simplify w= hat we've heard a few folks say, they prefer QuicTransport because it s= impler and they don't need pooling.

    I'd li= ke to push more on this, what is the measurable complexity of HTTP/3 over Q= UIC plus a new application mapping that needs to be defined? Let's isol= ate pooling as a variable and ignore it.

    Victor me= ntioned his proposal for a unified header semantic across all transports, t= his is https://github.c= om/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. Taking a= closer look at it, I have some concerns that I added as comments. HTTP ha= s semantics for a reason. If QuicTransport is going to start borrowing HTTP= piecemeal, I really wonder how simple people might feel it is. I think it&= #39;s important to avoid something that looks like HTTP but behaves differe= ntly. Is it really much of a stretch to just do HTTP/3 but give it a differ= ent ALPN so that we avoid problems related to cross-protocol pooling?
    =

    Cheers,
    Lucas
    --
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    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
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    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
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    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
    Webtransport mailing list
    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=


    --
    Kazuho Oku
    --000000000000ea9ff905b443da62-- From nobody Mon Nov 16 18:02:33 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C6EBE3A1872 for ; Mon, 16 Nov 2020 18:02:31 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id n0V7Yl4GMMCf for ; Mon, 16 Nov 2020 18:02:27 -0800 (PST) Received: from mail-ot1-x329.google.com (mail-ot1-x329.google.com [IPv6:2607:f8b0:4864:20::329]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 1E0213A186D for ; Mon, 16 Nov 2020 18:02:27 -0800 (PST) Received: by mail-ot1-x329.google.com with SMTP id f16so17961867otl.11 for ; Mon, 16 Nov 2020 18:02:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=nxK+OXjBkIXb6/LxOCPGH8yW/C+N8pOSBNWW3JreDxU=; b=nDbHA8Q9T2r4f56mo2wvrDbbQ+LUOzdboqYoXZT887WcDgaama12Qgb1Hn5VTtta3+ nH5tZGOy1DSsw3Epkso+5EyXqL2wTWCwfyk1UUe6dls0Qao09tm4LejBDDSnedn/52aj ltHbdRaT6Eh2VXH0Xh27RY2FwxGB+46V8zszw2iZXkvhELknSHME5x9IUskp63nPRY1F FhJYUqKDD1ahxnbppgimghiFFj+lEvE+i9QOkVwAXYhl9JVrgUYO8nN/fjCzvEiE6o2X x22EYLksh6XdaYwMZFiQt5GoukGhz1CR6IqRw0KT63mKSgWJFyfyxvQ0izK3u3O3HDv1 VoLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=nxK+OXjBkIXb6/LxOCPGH8yW/C+N8pOSBNWW3JreDxU=; b=gMQwE8vqn+xzV4f1WIgosvDZlv6KsrX9Y58fwM4lWwpJtCpTElwSxBSSyZgD1MesE/ iB3ddWU9kCDURYswBKUk2VjA8iLJ5kp9FFIsWlZre+KIJ06C0KSF7oMfeh3H95lL9PZu ozVaBU7DAUjCeI9vjbQ89cJK9coo8nhe+pfPfWN4ne91bsRFm8N39roCeHNEzZ24f1L8 +h1HlVbiv48o2xXmwWl+Bq0dXAK3yLGKNj+hkQRUCOy/ksT5dTMbBh0F9tKUbXxrg4LH 0+jPwYxJAWEjnQgz8bjO9JPl6Y0AH/4H/2oQQ/bRNlWWOtu4VgbKYrqJkdGVwSdQvaZP ozKA== X-Gm-Message-State: AOAM5326nuu7xsteXxBe2NgJ+fBTT4KH0PKKedH/xJAAw/qi809ydEng mxX50GCLt7LV/Zdl1Obuo2oV0fzXyy18XmVzjhE= X-Google-Smtp-Source: ABdhPJyT4VX4IKllZwIz8KoH5VnrJITT1+49/xRX845Jvd3Y3edwdmDxfvah3OAIPrx2VeYt9NsPTKsqeYTngfrkkXk= X-Received: by 2002:a05:6830:22da:: with SMTP id q26mr1602870otc.127.1605578546392; Mon, 16 Nov 2020 18:02:26 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Luke Curley Date: Mon, 16 Nov 2020 18:02:15 -0800 Message-ID: To: David Schinazi Cc: Ian Swett , Bernard Aboba , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="000000000000eab4ba05b443e27d" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 02:02:32 -0000 --000000000000eab4ba05b443e27d Content-Type: text/plain; charset="UTF-8" I think that's a good starting summary David. Some things worth mentioning: For 1 and 4, Twitch is using QuicTransport for both native applications (ex. mobile, desktop, devices) and web applications. It's minor, but we benefit from the ability to use any QUIC library (technically we don't implement datagrams...) instead only those with HTTP/3 and Http3Transport support. I think this context was missing in the previous discussions. For 3, QuicTransport can support 0-RTT if we declare the path/origin handshake to be idempotent ... unless the new connection is routed to a different host. Both pooled Http3Transport and a new QuicTransport connection could take the same number of round trips. For 4 and 5, I'm worried about flow control . tl;dr a Http3Transport session could easily exhaust flow control limits for the entire connection. This seems especially negative if pooling is performed transparently (ex. a Http3Transport session may silently break HTTP/3 or other sessions). On Mon, Nov 16, 2020 at 5:10 PM David Schinazi wrote: > I'd like us to take a step back, I think we're conflating many different > topics here, and it's making it impossible to reason about this (at least > for someone running on not enough sleep like I am this week). > > Topic 1: the complexity of implementing Http3Transport as opposed to > QuicTransport on the client > From my perspective, all browsers interested in WebTransport are > implementing HTTP/3, so I don't see much complexity there. > Please reply here if you know of complexities I'm not seeing > > Topic 2: the complexity of implementing Http3Transport as opposed to > QuicTransport on the server > As far as I know, most server-side QUIC stacks also support HTTP/3, > and for QuicTransport they already have DATAGRAM support so I think the > delta is negligible. > Please reply here if you know of complexities I'm not seeing > > Topic 3: the benefits of pooling WebTransport > This allows saving round trips to get WebTransport up and running > This allows sharing congestion control state > This allows letting the QUIC implementation prioritize DATAGRAMs vs > HTTP requests instead of relying on the kernel or routers which have less > information > Overall, I think pooling is beneficial (though not an absolute > must-have) > Please reply here if you know of benefits I'm not seeing > > Topic 4: the difficulty of pooling Http3Transport on the client > It appears that all browsers that are interested in WebTransport are > implementing pooling in their HTTP/3 stack so additionally pooling > WebTransport should not introduce more complexity > Please reply here if you know of complexities I'm not seeing > > Topic 5: the difficulty of pooling Http3Transport on the server > This one is trickier. If you have frontends that know how to route > HTTP requests to backends, DATAGRAM support is going to be a whole new > world. > However, and I think this is really important: implementing this on > the server is OPTIONAL. > The server can easily use a different hostname (and different TLS > certificates) for HTTP vs WebTransport and clients will not pool the two > together. > Once you use different domain names per WebTransport object, > Http3Transport has the exact same pooling properties as QuicTransport. > Please reply here if you know of complexities I'm not seeing > > What am I missing? > > Thanks, > David > > > On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: > >> I'm *very* concerned about any functionality that *requires* pooling. >> Pooling is a client-specific optimization and pooling policy is subject to >> change(within reason) at any time. If applications are saying "it'd be >> cool if we could share congestion control and loss recovery state between >> H3 and WebTransport most of the time", then I can see there being >> real(albeit small) benefits, just like there would be for putting >> DataChannels and RTP into one QUIC connection for WebRTC. If people are >> intending to rely on pooling so an HTTP(hopefully H3) request can trigger a >> WebTransport response, I think we're in a world of pain and >> over-optimization. >> >> This is more obvious in light of the fact that a WebTransport endpoint is >> likely not a generic CDN endpoint, as has been clearly stated by Mark >> Nottingham. >> >> Bernard's comments above point to a tighter coupling between HTTP/3 and >> WebTransport than I think is practical in production, unless I >> misunderstood(which I may have, it's been a long day). >> >> All of this makes me think we should punt the HTTP based WebTransport >> options down the road a year or so and focus on QuicTransport initially. >> It's not to say we won't do them, but they're clearly more complex >> than QuicTransport and it'd be good to have real deployment experience >> prior to starting so we know what the requirements are and where the >> dragons are lurking. Also, the W3C should design APIs that make it easy to >> detect failure to establish a QUIC-based WebTransport, and this ensures >> those are well exercised. Maybe we DO require pooling under certain >> conditions and describe those, but there are likely privacy concerns under >> some circumstances and I'm not enough of an expert to know what would be >> acceptable to all clients. >> >> Some people in the WG may think we have to release a TCP based >> WebTransport at the same time as a QUIC based one, but I don't think that's >> true and even if we standardized them at the same time, it doesn't mean >> both will achieve wide deployment at the same time. As I said at the mic, >> I don't see any reason YouTube would deploy a TCP based WebTransport given >> it will have to maintain an HTTP/1.1 option for basically forever and >> they've spent a good bit of effort to make sure that works as well as it >> can. It's clear to me there are compelling use cases right now for >> QuicTransport, but the driving use cases for the fallback are not clear to >> me. Consistency is intellectually appealing, but doesn't drive deployments. >> >> Ian >> >> On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba >> wrote: >> >>> David said: >>> >>> "Where does this come from? A lot of QUIC servers are implementing QUIC >>> datagrams, and once you have those the delta with h3 datagrams is >>> negligible. Additionally, multiple h3 server implementers have indicated >>> they want to support WebTransport. It's starting to feel like the pushback >>> on HTTP3Transport is purely based on a perception of complexity from folks >>> who haven't tried to implement it? If that's the case, then we should get >>> some implementation experience to confirm or debunk that theory." >>> >>> [BA] The pooling use cases often involve an interaction between an >>> HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn't >>> just elicit an HTTP/3 Response. It also causes something else to happen, >>> something that isn't specified in the HTTP/3 protocol, such as eliciting a >>> datagram flow or bi/unidirectional stream from the server. This is what is >>> contemplated in several of the "Live Event" use cases, where the HTTP/3 >>> Request/Response would be requesting the desired Event. The major advantage >>> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >>> stalls. So developers understand the value that support for datagrams and >>> server-initiated streams can provide - the question is whether they'll have >>> all the interoperable pieces in place to deploy it. >>> >>> Just because a generic HTTP/3 server supports QUIC and WebTransport, >>> doesn't mean that it will support these use cases. I've been asked whether >>> better interoperability and wider ecosystem support could be achieved by >>> extending HTTP/3 in a way more in keeping with the existing protocol design >>> - such as by allowing an HTTP/3 Request to specify a resource to be >>> returned in a flow of datagrams. >>> >>> The situation might be more tenable if the node.js framework had HTTP/3 >>> and QUIC modules on the horizon. >>> >>> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi >>> wrote: >>> >>>> >>>> >>>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba >>>> wrote: >>>> >>>>> Luke said: >>>>> >>>>> "My primary concern is that Http3Transport requires non-generic >>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>> worried that this will limit support for Http3Transport and complicates any >>>>> HTTP/3 implementation that does support it." >>>>> >>>>> [BA] I have also heard this concern from developers. The concerns >>>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>>> WebTransport. This does enable some interesting use cases, such as a >>>>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>>>> or initiating bi-directional or uni-directional streams. So there is >>>>> perceived value, but the question is whether that value will be widely >>>>> supported across the HTTP/3 ecosystem. >>>>> >>>>> At this point, most generic HTTP/3 servers are not expected to support >>>>> HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport >>>>> (perceived as a niche protocol), so that pooling would only be possible >>>>> when using a framework. node.js will not have QUIC support for 12-18 >>>>> months (held up by OpenSSL) so even framework support is expected to be >>>>> limited. >>>>> >>>> >>>> Where does this come from? A lot of QUIC servers are implementing QUIC >>>> datagrams, and once you have those the delta with h3 datagrams is >>>> negligible. Additionally, multiple h3 server implementers have indicated >>>> they want to support WebTransport. It's starting to feel like the pushback >>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>> who haven't tried to implement it? If that's the case, then we should get >>>> some implementation experience to confirm or debunk that theory. >>>> >>>> >>>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>>> dschinazi.ietf@gmail.com> wrote: >>>>> >>>>>> >>>>>> >>>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>>> wrote: >>>>>> >>>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>>> leveraged for QuicTransport in the form of the header parsing. I think >>>>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>>> >>>>>>> My primary concern is that Http3Transport requires non-generic >>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>> HTTP/3 implementation that does support it. >>>>>>> >>>>>> >>>>>> Hi Luke, >>>>>> >>>>>> I'm curious, could you elaborate on what these "non-generic >>>>>> modifications to the HTTP/3 layer" are please? >>>>>> >>>>>> Thanks, >>>>>> David >>>>>> >>>>>> >>>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>> >>>>>>>> Hi Luke, >>>>>>>> >>>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really >>>>>>>>> mean "QuicTransport has greater interoperability". You can take any QUIC >>>>>>>>> implementation (+ datagram extension) and add a thin layer to support >>>>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>>> >>>>>>>> >>>>>>>> Thanks for the clarification. I appreciate the sentiment. But given >>>>>>>> the development of QUIC its kind of surprising that people would find it >>>>>>>> easier to identify an implementation that supports QUIC and datagram but >>>>>>>> does not support HTTP/3. >>>>>>>> >>>>>>>> Thr situation for a more clean-room implementation is different, I >>>>>>>> agree. However, by the time you've done all the hard stuff with QUIC, a >>>>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>>>>>> compression, server push and extensibility points. >>>>>>>> >>>>>>>> I also see the current design being the thin end of the wedge. The >>>>>>>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>>>> years of effort. >>>>>>>> >>>>>>>> Cheers >>>>>>>> Lucas >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> Hi folks, >>>>>>>>>> >>>>>>>>>> To follow up on one thread of discussion during IETF 109. To over >>>>>>>>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>>> >>>>>>>>>> I'd like to push more on this, what is the measurable complexity >>>>>>>>>> of HTTP/3 over QUIC plus a new application mapping that needs to be >>>>>>>>>> defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>>> >>>>>>>>>> Victor mentioned his proposal for a unified header semantic >>>>>>>>>> across all transports, this is >>>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>>> cross-protocol pooling? >>>>>>>>>> >>>>>>>>>> Cheers, >>>>>>>>>> Lucas >>>>>>>>>> -- >>>>>>>>>> Webtransport mailing list >>>>>>>>>> Webtransport@ietf.org >>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>> >>>>>>>>> -- >>>>>>> Webtransport mailing list >>>>>>> Webtransport@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>> >>>>>> -- >>>>>> Webtransport mailing list >>>>>> Webtransport@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>> >>>>> -- >>> Webtransport mailing list >>> Webtransport@ietf.org >>> https://www.ietf.org/mailman/listinfo/webtransport >>> >> --000000000000eab4ba05b443e27d Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    I think that's a good starting summary David. Some thi= ngs worth mentioning:

    For 1 and 4, Twitch is using QuicT= ransport for both native applications (ex. mobile, desktop, devices) and we= b applications. It's minor, but we benefit from the ability to use any = QUIC library (technically we don't implement datagrams...) instead only= those with HTTP/3 and Http3Transport support. I think this context was mis= sing in the previous discussions.

    For 3, QuicTrans= port can support 0-RTT if we declare the path/origin handshake to be=C2=A0idempotent= ... unless the new connection is routed to a different host. Both pooled Ht= tp3Transport and a new QuicTransport connection could take the same number = of round trips.

    For 4 and 5, I'm worried about flow control= . tl;dr a Http3Transport session could easily exhaust flow control limi= ts for the entire connection. This seems especially negative if pooling is = performed transparently (ex. a Http3Transport session may silently break HT= TP/3 or other sessions).

    On Mon, Nov 16, 2020 at 5:10 PM David Schinaz= i <dschinazi.ietf@gmail.com<= /a>> wrote:
    <= div dir=3D"ltr">I'd like us to take a step back, I think we're conf= lating many different topics here, and it's making it impossible to rea= son about this (at least for someone running on not enough sleep like I am = this week).

    Topic 1: the complexity of implementing=C2= =A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the client
    =
    =C2=A0 =C2=A0 From my perspective, all browsers interested in WebTrans= port are implementing HTTP/3, so I don't see much complexity there.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm = not seeing

    Topic 2: the complexity of impleme= nting=C2=A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the serv= er
    =C2=A0 =C2=A0 As far as I know, most server-side QUIC st= acks also support HTTP/3, and for QuicTransport=C2=A0they already have DATA= GRAM support so I think the delta is negligible.
    =C2=A0 =C2=A0 Pl= ease reply here if you know of complexities I'm not seeing

    Topic 3: the benefits of pooling WebTransport
    =
    =C2=A0 =C2=A0 This allows saving round trips to get WebTransport up an= d running
    =C2=A0 =C2=A0 This allows sharing congestion control st= ate
    =C2=A0 =C2=A0 This allows letting the QUIC implementation pri= oritize DATAGRAMs vs HTTP requests instead of relying on the kernel or rout= ers which have less information
    =C2=A0 =C2=A0 Overall, I think po= oling is beneficial (though not an absolute must-have)
    =C2=A0 =C2= =A0 Please reply here if you know of benefits I'm not seeing
    <= div>
    Topic 4: the difficulty of pooling Http3Transport=C2=A0o= n the client
    =C2=A0 =C2=A0 It appears that all browsers that are = interested in WebTransport are implementing pooling in their HTTP/3 stack s= o additionally pooling WebTransport should not introduce more complexity
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm= not seeing

    Topic 5: the difficult= y of pooling Http3Transport=C2=A0on the server
    =C2=A0 =C2= =A0 This one is trickier. If you have frontends that know how to route HTTP= =C2=A0requests to backends, DATAGRAM support is going to be a whole new wor= ld.
    =C2=A0 =C2=A0 However, and I think this is really important: = implementing this on the server is OPTIONAL.
    =C2=A0 =C2=A0 The se= rver can easily use a different hostname (and different TLS certificates) f= or HTTP vs WebTransport and clients will not pool the two together.
    =C2=A0 =C2=A0 Once you use different domain names per WebTransport objec= t, Http3Transport=C2=A0has the exact same pooling properties as QuicTranspo= rt.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I= 'm not seeing

    What am I missing?

    Thanks,
    David


    On Mon, Nov 16,= 2020 at 4:45 PM Ian Swett <ianswett@google.com> wrote:
    I'm very conce= rned about any functionality that requires pooling.=C2=A0 Pooling is= a client-specific optimization and pooling policy is subject to change(wit= hin reason) at any time.=C2=A0 If applications=C2=A0are saying "it'= ;d be cool if we could share congestion control and loss recovery state bet= ween H3 and WebTransport most of the time", then I can see there being= real(albeit small) benefits, just like there would be for putting DataChan= nels and RTP into one QUIC connection for WebRTC.=C2=A0 If people are inten= ding to rely on pooling so an HTTP(hopefully H3) request can trigger a WebT= ransport response, I think we're in a world of pain and over-optimizati= on.

    This is more obvious in light of the fact that a Web= Transport endpoint=C2=A0is likely not a generic CDN endpoint, as has been c= learly stated by Mark Nottingham.

    Bernard's comm= ents above point to a tighter coupling between HTTP/3 and WebTransport than= I think is practical in production, unless I misunderstood(which I may hav= e, it's been a long day).

    All of this makes me= think we should punt the HTTP based WebTransport options down the road a y= ear or so and focus on QuicTransport=C2=A0initially.=C2=A0 It's not to = say we won't do them, but they're clearly more complex than=C2=A0Qu= icTransport=C2=A0and it'd be good to have real deployment experience pr= ior to starting so we know what the requirements are and where the dragons = are lurking.=C2=A0 Also, the W3C should design APIs that make it easy to de= tect failure to establish a QUIC-based=C2=A0WebTransport, and this ensures = those are well exercised.=C2=A0 Maybe we DO require pooling under certain c= onditions and describe those, but there are likely privacy concerns under s= ome circumstances and I'm not enough of an expert to know what would be= acceptable to all clients.

    Some=C2=A0people in th= e WG may think we have to release a TCP based WebTransport at the same time= as a QUIC based one, but I don't think that's true and even if we = standardized them at the same time, it doesn't mean both will achieve w= ide deployment at the same time.=C2=A0 As I said at the mic, I don't se= e any reason YouTube would deploy a TCP based WebTransport given it will ha= ve to maintain an HTTP/1.1 option for basically forever and they've spe= nt a good bit of effort to make sure that works as well as it can.=C2=A0 It= 's clear to me there are compelling use cases right now for QuicTranspo= rt, but=C2=A0the driving use cases for the fallback are not clear to me.=C2= =A0 Consistency is intellectually appealing, but doesn't drive deployme= nts.

    Ian

    On Mon, Nov 16, 2020 at 6:36 P= M Bernard Aboba <bernard.aboba@gmail.com> wrote:
    David said:=C2=A0

    "Where does this come from? = A lot of QUIC servers are implementing QUIC datagrams, and once you have th= ose the delta with h3 datagrams is negligible. Additionally, multiple h3 se= rver implementers=C2=A0have indicated they want to support WebTransport. It= 's starting to feel like the pushback on HTTP3Transport=C2=A0is purely = based on a perception of complexity from folks who haven't tried to imp= lement it? If that's the case, then we should get some implementation e= xperience to confirm or debunk that theory."

    = [BA] The pooling use cases often involve an interaction between an HTTP/3 r= equest/response and WebTransport.=C2=A0 so the HTTP/3 Request doesn't j= ust elicit an HTTP/3 Response.=C2=A0 It also causes something else to happe= n, something that isn't specified in the HTTP/3 protocol, such as elici= ting a datagram flow or bi/unidirectional stream from the server.=C2=A0 Thi= s is what is contemplated in several of the "Live Event" use case= s, where the HTTP/3 Request/Response would be requesting the desired Event.= The major advantage over HLS is avoiding Head-of-Line blocking, reducing v= ideo freezes and stalls.=C2=A0 So developers understand the value that supp= ort for datagrams and server-initiated streams can provide - the question i= s whether they'll have all the interoperable pieces in place to deploy = it.=C2=A0

    Just because a generic HTTP/3 server su= pports QUIC and WebTransport, doesn't mean that it will support these u= se cases.=C2=A0 I've been asked whether better interoperability and wid= er ecosystem support could be achieved by extending HTTP/3 in a way more in= keeping with the existing protocol design - such as by allowing an HTTP/3 = Request to specify a resource to be returned in a flow of datagrams.=C2=A0<= /div>

    The situation might be more tenable if the node.js= framework had HTTP/3 and QUIC modules on the horizon.

    On Mon, Nov 16, 2020 at 1:00 PM David Schinazi <dschinazi.ietf@gmail.com> wro= te:


    On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba &l= t;bernard.abob= a@gmail.com> wrote:
    Luke said:=C2=A0

    "My primary concern is that Http3Transport req= uires non-generic modifications to the HTTP/3 layer mostly to support conne= ction pooling. I'm worried that this will limit support for Http3Transp= ort and complicates any HTTP/3 implementation that does support it.&= quot;

    [BA] I have also heard this concern from dev= elopers. The concerns primarily arise from the pooling of HTTP/3 Request/Re= sponses with WebTransport. This does enable some interesting use cases, suc= h as a Request/Response (e.g. gRPC) that can result in a server sending dat= agrams or initiating bi-directional or uni-directional streams.=C2=A0 So th= ere is perceived value, but the question is whether that value will be wide= ly supported across the HTTP/3 ecosystem.=C2=A0

    At= this point, most generic HTTP/3 servers are not expected to support HTTP/3= datagrams (not part of the HTTP/3 protocol) or Http3Transport (perceived a= s a niche protocol), so that pooling would only be possible when using a fr= amework.=C2=A0 node.js will not have=C2=A0QUIC support for 12-18 months (he= ld up by OpenSSL) so even framework support is expected to be limited.

    Where does this come from? A lot of= QUIC servers are implementing QUIC datagrams, and once you have those the = delta with h3 datagrams is negligible. Additionally, multiple h3 server imp= lementers=C2=A0have indicated they want to support WebTransport. It's s= tarting to feel like the pushback on HTTP3Transport=C2=A0is purely based on= a perception of complexity from folks who haven't tried to implement i= t? If that's the case, then we should get some implementation experienc= e to confirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David Schinazi <= dschinazi.iet= f@gmail.com> wrote:


    On Mon, Nov 16, 2020 at 11= :34 AM Luke Curley <kixelated@gmail.com> wrote:
    We're on the same page that th= ere's code in HTTP/3 that could be leveraged for QuicTransport in the f= orm of the header parsing. I think there's a path to merge QuicTranspor= t and Http3Transport by leveraging HTTP/3 for the handshake and QUIC for st= ream delivery.

    My primary concern is that Http3Transport= requires non-generic modifications to the HTTP/3 layer mostly to support c= onnection pooling. I'm worried that this will limit support for Http3Tr= ansport and complicates any HTTP/3 implementation that does support it.

    Hi Luke,

    = I'm curious, could you elaborate on what these "non-generic modifi= cations to the HTTP/3 layer" are please?

    Than= ks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com= > wrote:
    Hi Luke,

    On Mon, 16 Nov 20= 20, 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clarify, when I s= ay "QuicTransport is simpler" I really mean "QuicTransport h= as greater interoperability". You can take any QUIC implementation (+ = datagram extension) and add a thin layer to support QuicTransport. It's= a nice layering of protocols and it's something that I want to see in = general as QUIC replaces TCP.

    Thanks for the clarification. I appre= ciate the sentiment. But given the development of QUIC its kind of surprisi= ng that people would find it easier to identify an implementation that supp= orts QUIC and datagram but does not support HTTP/3.
    =
    Thr situation for a more clean-room implementat= ion is different, I agree. However, by the time you've done all the har= d stuff with QUIC, a very focused HTTP/3 layer ends up quite thin too. You = can ignore dynamic compression, server push and extensibility points.
    =

    I also see the current design= being the thin end of the wedge. The proposal I linked talks about HTTP-li= ke header parsing. So its "just" a thin layer to do some parsing.= Then folks will probably want some want to tweak parameter, acontrol chann= el, a way to do graceful close, a sprinkle of GREASE. To extrapolate forwar= d, what would be the delta be between some final product QuicTransport and = HTTP/3. Too small a delta and we've wasted years of effort.

    Cheers
    Lucas=



    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <lu= caspardue.24.7@gmail.com> wrote:
    Hi folks,

    To follow up on one thread of discussion during IETF 109. To over sim= plify what we've heard a few folks say, they prefer QuicTransport becau= se it simpler and they don't need pooling.

    I&#= 39;d like to push more on this, what is the measurable complexity of HTTP/3= over QUIC plus a new application mapping that needs to be defined? Let'= ;s isolate pooling as a variable and ignore it.

    Vi= ctor mentioned his proposal for a unified header semantic across all transp= orts, this is https://g= ithub.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. T= aking a closer look at it, I have some concerns that I added as comments. = HTTP has semantics for a reason. If QuicTransport is going to start borrowi= ng HTTP piecemeal, I really wonder how simple people might feel it is. I th= ink it's important to avoid something that looks like HTTP but behaves = differently. Is it really much of a stretch to just do HTTP/3 but give it a= different ALPN so that we avoid problems related to cross-protocol pooling= ?

    Cheers,
    Lucas
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
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    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
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    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --
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    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000eab4ba05b443e27d-- From nobody Mon Nov 16 21:29:20 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0C0D93A0E01 for ; Mon, 16 Nov 2020 21:29:19 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5163aTPgfovZ for ; Mon, 16 Nov 2020 21:29:15 -0800 (PST) Received: from mail-lj1-x236.google.com (mail-lj1-x236.google.com [IPv6:2a00:1450:4864:20::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EA27F3A0DFE for ; Mon, 16 Nov 2020 21:29:14 -0800 (PST) Received: by mail-lj1-x236.google.com with SMTP id s9so22817645ljo.11 for ; Mon, 16 Nov 2020 21:29:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=pod9hmMKuik5Utq7qRxMeMIDHqXfB9Ic3tHh2MK2Zqw=; b=a8R4SkUQuoYEjX/INOzLck6mMTJ/81WjMgikOOaJtmhv2NWarQUBlkcQ5t8aO8ZDxH jNdTSJQscKa2ZGe3nx3sqxJf7P1OoyJ1ws4QVNKo3p7l6x2ZMQagadVo5dEYyitic4Z2 THQkNe+T1MmIvaEmv7vLbQE9moH+9wZ/2br1lsdvHG9UXQyb54YEOWS0ZroRHlQYu8lJ VwfXMdGDiQKqSLZ4FQxBrlDE1jY9SSoWgFB66CFOkW3vhQEX3tFsTfzfc4s6UMxyP9bH 1fzkyCiU3j3GYsGuukJqI0JXKYOtOV46ncVo8pQfQ56HmRX09dkrsrBDTni0JAW1KFMB SfGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=pod9hmMKuik5Utq7qRxMeMIDHqXfB9Ic3tHh2MK2Zqw=; b=PTNzggY2V5FaOJjR7AlY4qYzUfMCfra5YdxeidGc/6Qmm5PoxQuyPnOHxZMTqa3lHe S2JAVMRyJX7Hv3NvRiZpE+kNBuoyxKjsK3RdfZc6up3QoQxcHZHNxKL0cBU2ULQ3IvU9 Jd3DyCPlXYifS6qH44EZTQRknolGWc0+2BBwdM2L73v1e1CUUgZH8ejwlscS9zD4i/Wn 3oFG8/jkDXZMTg4K1J9vaLiu2XCzR/3cqcAil5AT2DP86bNHzktCm8CMVZTx8Albj+Qc wEbteb1qU2diOZuECiRcHOMHC3A/k9XoGJfSKFu2a32p3eNLoRD2O4geDZ3bNoRz7jDt Z+Xw== X-Gm-Message-State: AOAM530MuFYNz1dxvG8Cpbae/u7l+wjcaXshwXOBvsKsTtC0aXE7t7xw /5Gpk5fqtU+YakUvf1De7WKC5n4E262RkMkiQvI= X-Google-Smtp-Source: ABdhPJxvvDQfp57jFPJVJOHvuus1vk/UN3/fX2dhwTu5edc6WIeeWlgs27/ODm/hUSJIjvsMu0vDC1mz9hrWWglgoiQ= X-Received: by 2002:a05:651c:319:: with SMTP id a25mr1177635ljp.333.1605590952796; Mon, 16 Nov 2020 21:29:12 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: David Schinazi Date: Mon, 16 Nov 2020 21:29:01 -0800 Message-ID: To: Luke Curley Cc: Ian Swett , Bernard Aboba , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="00000000000065649105b446c6ed" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 05:29:19 -0000 --00000000000065649105b446c6ed Content-Type: text/plain; charset="UTF-8" On Mon, Nov 16, 2020 at 6:02 PM Luke Curley wrote: > I think that's a good starting summary David. Some things worth mentioning: > > For 1 and 4, Twitch is using QuicTransport for both native applications > (ex. mobile, desktop, devices) and web applications. It's minor, but we > benefit from the ability to use any QUIC library (technically we don't > implement datagrams...) instead only those with HTTP/3 and Http3Transport > support. I think this context was missing in the previous discussions. > Can you clarify which implementations you were considering that support QUIC+DATAGRAM but not HTTP/3? > For 3, QuicTransport can support 0-RTT if we declare the path/origin > handshake to be idempotent > ... unless the new > connection is routed to a different host. Both pooled Http3Transport and a > new QuicTransport connection could take the same number of round trips. > 0-RTT state isn't saved across ALPNs, even if it's to the same host. So Http3Transport would get inline 0-RTT but QuicTransport would not get 0-RTT unless you've already performed a QuicTransport handshake in recent history. > For 4 and 5, I'm worried about flow control > . tl;dr a > Http3Transport session could easily exhaust flow control limits for the > entire connection. This seems especially negative if pooling is performed > transparently (ex. a Http3Transport session may silently break HTTP/3 or > other sessions). > Unintentionally hitting the connection-level flow control limit is a serious implementation bug. I wouldn't expect this to still be a problem once implementations mature. I wouldn't want to base our protocol choices based on a bug in non-production-ready implementations. > On Mon, Nov 16, 2020 at 5:10 PM David Schinazi > wrote: > >> I'd like us to take a step back, I think we're conflating many different >> topics here, and it's making it impossible to reason about this (at least >> for someone running on not enough sleep like I am this week). >> >> Topic 1: the complexity of implementing Http3Transport as opposed to >> QuicTransport on the client >> From my perspective, all browsers interested in WebTransport are >> implementing HTTP/3, so I don't see much complexity there. >> Please reply here if you know of complexities I'm not seeing >> >> Topic 2: the complexity of implementing Http3Transport as opposed to >> QuicTransport on the server >> As far as I know, most server-side QUIC stacks also support HTTP/3, >> and for QuicTransport they already have DATAGRAM support so I think the >> delta is negligible. >> Please reply here if you know of complexities I'm not seeing >> >> Topic 3: the benefits of pooling WebTransport >> This allows saving round trips to get WebTransport up and running >> This allows sharing congestion control state >> This allows letting the QUIC implementation prioritize DATAGRAMs vs >> HTTP requests instead of relying on the kernel or routers which have less >> information >> Overall, I think pooling is beneficial (though not an absolute >> must-have) >> Please reply here if you know of benefits I'm not seeing >> >> Topic 4: the difficulty of pooling Http3Transport on the client >> It appears that all browsers that are interested in WebTransport are >> implementing pooling in their HTTP/3 stack so additionally pooling >> WebTransport should not introduce more complexity >> Please reply here if you know of complexities I'm not seeing >> >> Topic 5: the difficulty of pooling Http3Transport on the server >> This one is trickier. If you have frontends that know how to route >> HTTP requests to backends, DATAGRAM support is going to be a whole new >> world. >> However, and I think this is really important: implementing this on >> the server is OPTIONAL. >> The server can easily use a different hostname (and different TLS >> certificates) for HTTP vs WebTransport and clients will not pool the two >> together. >> Once you use different domain names per WebTransport object, >> Http3Transport has the exact same pooling properties as QuicTransport. >> Please reply here if you know of complexities I'm not seeing >> >> What am I missing? >> >> Thanks, >> David >> >> >> On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: >> >>> I'm *very* concerned about any functionality that *requires* pooling. >>> Pooling is a client-specific optimization and pooling policy is subject to >>> change(within reason) at any time. If applications are saying "it'd be >>> cool if we could share congestion control and loss recovery state between >>> H3 and WebTransport most of the time", then I can see there being >>> real(albeit small) benefits, just like there would be for putting >>> DataChannels and RTP into one QUIC connection for WebRTC. If people are >>> intending to rely on pooling so an HTTP(hopefully H3) request can trigger a >>> WebTransport response, I think we're in a world of pain and >>> over-optimization. >>> >>> This is more obvious in light of the fact that a WebTransport >>> endpoint is likely not a generic CDN endpoint, as has been clearly stated >>> by Mark Nottingham. >>> >>> Bernard's comments above point to a tighter coupling between HTTP/3 and >>> WebTransport than I think is practical in production, unless I >>> misunderstood(which I may have, it's been a long day). >>> >>> All of this makes me think we should punt the HTTP based WebTransport >>> options down the road a year or so and focus on QuicTransport initially. >>> It's not to say we won't do them, but they're clearly more complex >>> than QuicTransport and it'd be good to have real deployment experience >>> prior to starting so we know what the requirements are and where the >>> dragons are lurking. Also, the W3C should design APIs that make it easy to >>> detect failure to establish a QUIC-based WebTransport, and this ensures >>> those are well exercised. Maybe we DO require pooling under certain >>> conditions and describe those, but there are likely privacy concerns under >>> some circumstances and I'm not enough of an expert to know what would be >>> acceptable to all clients. >>> >>> Some people in the WG may think we have to release a TCP based >>> WebTransport at the same time as a QUIC based one, but I don't think that's >>> true and even if we standardized them at the same time, it doesn't mean >>> both will achieve wide deployment at the same time. As I said at the mic, >>> I don't see any reason YouTube would deploy a TCP based WebTransport given >>> it will have to maintain an HTTP/1.1 option for basically forever and >>> they've spent a good bit of effort to make sure that works as well as it >>> can. It's clear to me there are compelling use cases right now for >>> QuicTransport, but the driving use cases for the fallback are not clear to >>> me. Consistency is intellectually appealing, but doesn't drive deployments. >>> >>> Ian >>> >>> On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba >>> wrote: >>> >>>> David said: >>>> >>>> "Where does this come from? A lot of QUIC servers are implementing QUIC >>>> datagrams, and once you have those the delta with h3 datagrams is >>>> negligible. Additionally, multiple h3 server implementers have indicated >>>> they want to support WebTransport. It's starting to feel like the pushback >>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>> who haven't tried to implement it? If that's the case, then we should get >>>> some implementation experience to confirm or debunk that theory." >>>> >>>> [BA] The pooling use cases often involve an interaction between an >>>> HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn't >>>> just elicit an HTTP/3 Response. It also causes something else to happen, >>>> something that isn't specified in the HTTP/3 protocol, such as eliciting a >>>> datagram flow or bi/unidirectional stream from the server. This is what is >>>> contemplated in several of the "Live Event" use cases, where the HTTP/3 >>>> Request/Response would be requesting the desired Event. The major advantage >>>> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >>>> stalls. So developers understand the value that support for datagrams and >>>> server-initiated streams can provide - the question is whether they'll have >>>> all the interoperable pieces in place to deploy it. >>>> >>>> Just because a generic HTTP/3 server supports QUIC and WebTransport, >>>> doesn't mean that it will support these use cases. I've been asked whether >>>> better interoperability and wider ecosystem support could be achieved by >>>> extending HTTP/3 in a way more in keeping with the existing protocol design >>>> - such as by allowing an HTTP/3 Request to specify a resource to be >>>> returned in a flow of datagrams. >>>> >>>> The situation might be more tenable if the node.js framework had HTTP/3 >>>> and QUIC modules on the horizon. >>>> >>>> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi < >>>> dschinazi.ietf@gmail.com> wrote: >>>> >>>>> >>>>> >>>>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba < >>>>> bernard.aboba@gmail.com> wrote: >>>>> >>>>>> Luke said: >>>>>> >>>>>> "My primary concern is that Http3Transport requires non-generic >>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>> HTTP/3 implementation that does support it." >>>>>> >>>>>> [BA] I have also heard this concern from developers. The concerns >>>>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>>>> WebTransport. This does enable some interesting use cases, such as a >>>>>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>>>>> or initiating bi-directional or uni-directional streams. So there is >>>>>> perceived value, but the question is whether that value will be widely >>>>>> supported across the HTTP/3 ecosystem. >>>>>> >>>>>> At this point, most generic HTTP/3 servers are not expected to >>>>>> support HTTP/3 datagrams (not part of the HTTP/3 protocol) or >>>>>> Http3Transport (perceived as a niche protocol), so that pooling would only >>>>>> be possible when using a framework. node.js will not have QUIC support for >>>>>> 12-18 months (held up by OpenSSL) so even framework support is expected to >>>>>> be limited. >>>>>> >>>>> >>>>> Where does this come from? A lot of QUIC servers are implementing QUIC >>>>> datagrams, and once you have those the delta with h3 datagrams is >>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>> who haven't tried to implement it? If that's the case, then we should get >>>>> some implementation experience to confirm or debunk that theory. >>>>> >>>>> >>>>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>>>> wrote: >>>>>>> >>>>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>>>> leveraged for QuicTransport in the form of the header parsing. I think >>>>>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>>>> >>>>>>>> My primary concern is that Http3Transport requires non-generic >>>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>>> HTTP/3 implementation that does support it. >>>>>>>> >>>>>>> >>>>>>> Hi Luke, >>>>>>> >>>>>>> I'm curious, could you elaborate on what these "non-generic >>>>>>> modifications to the HTTP/3 layer" are please? >>>>>>> >>>>>>> Thanks, >>>>>>> David >>>>>>> >>>>>>> >>>>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>> >>>>>>>>> Hi Luke, >>>>>>>>> >>>>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really >>>>>>>>>> mean "QuicTransport has greater interoperability". You can take any QUIC >>>>>>>>>> implementation (+ datagram extension) and add a thin layer to support >>>>>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>>>> >>>>>>>>> >>>>>>>>> Thanks for the clarification. I appreciate the sentiment. But >>>>>>>>> given the development of QUIC its kind of surprising that people would find >>>>>>>>> it easier to identify an implementation that supports QUIC and datagram but >>>>>>>>> does not support HTTP/3. >>>>>>>>> >>>>>>>>> Thr situation for a more clean-room implementation is different, I >>>>>>>>> agree. However, by the time you've done all the hard stuff with QUIC, a >>>>>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>>>>>>> compression, server push and extensibility points. >>>>>>>>> >>>>>>>>> I also see the current design being the thin end of the wedge. The >>>>>>>>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>>>>> years of effort. >>>>>>>>> >>>>>>>>> Cheers >>>>>>>>> Lucas >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>> >>>>>>>>>>> Hi folks, >>>>>>>>>>> >>>>>>>>>>> To follow up on one thread of discussion during IETF 109. To >>>>>>>>>>> over simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>>>> >>>>>>>>>>> I'd like to push more on this, what is the measurable complexity >>>>>>>>>>> of HTTP/3 over QUIC plus a new application mapping that needs to be >>>>>>>>>>> defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>>>> >>>>>>>>>>> Victor mentioned his proposal for a unified header semantic >>>>>>>>>>> across all transports, this is >>>>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>>>> cross-protocol pooling? >>>>>>>>>>> >>>>>>>>>>> Cheers, >>>>>>>>>>> Lucas >>>>>>>>>>> -- >>>>>>>>>>> Webtransport mailing list >>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>> >>>>>>>>>> -- >>>>>>>> Webtransport mailing list >>>>>>>> Webtransport@ietf.org >>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>> >>>>>>> -- >>>>>>> Webtransport mailing list >>>>>>> Webtransport@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>> >>>>>> -- >>>> Webtransport mailing list >>>> Webtransport@ietf.org >>>> https://www.ietf.org/mailman/listinfo/webtransport >>>> >>> --00000000000065649105b446c6ed Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


    =
    On Mon, Nov 16, 2020 at 6:02 PM Luke = Curley <kixelated@gmail.com&g= t; wrote:
    I think that's a good starting summary David. Some things wo= rth mentioning:

    For 1 and 4, Twitch is using QuicTranspo= rt for both native applications (ex. mobile, desktop, devices) and web appl= ications. It's minor, but we benefit from the ability to use any QUIC l= ibrary (technically we don't implement datagrams...) instead only those= with HTTP/3 and Http3Transport support. I think this context was missing i= n the previous discussions.

    Can= you clarify which implementations you were considering that support QUIC+D= ATAGRAM but not HTTP/3?
    =C2=A0

    For 4 and 5, I'm worried about flow control= . tl;dr a Http3Transport session could easily exhaust flow control limi= ts for the entire connection. This seems especially negative if pooling is = performed transparently (ex. a Http3Transport session may silently break HT= TP/3 or other sessions).

    Uninte= ntionally hitting the connection-level=C2=A0flow control limit is a serious= implementation bug. I wouldn't expect this to still be a problem once = implementations mature. I wouldn't want to base our protocol choices ba= sed on a bug in non-production-ready implementations.
    =C2=A0
    On Mon, Nov 16, 2020 at 5:10 PM Da= vid Schinazi <dschinazi.ietf@gmail.com> wrote:
    I'd like us to take a step= back, I think we're conflating many different topics here, and it'= s making it impossible to reason about this (at least for someone running o= n not enough sleep like I am this week).

    Topic 1: the co= mplexity of implementing=C2=A0Http3Transport=C2=A0as opposed to QuicTranspo= rt=C2=A0on the client
    =C2=A0 =C2=A0 From my perspective, all brow= sers interested in WebTransport are implementing HTTP/3, so I don't see= much complexity there.
    =C2=A0 =C2=A0 Please reply here if you kn= ow of complexities I'm not seeing

    Topic 2= : the complexity of implementing=C2=A0Http3Transport=C2=A0as opposed to Qui= cTransport=C2=A0on the server
    =C2=A0 =C2=A0 As far as I kno= w, most server-side QUIC stacks also support HTTP/3, and for QuicTransport= =C2=A0they already have DATAGRAM support so I think the delta is negligible= .
    =C2=A0 =C2=A0 Please reply here if you know of complexities I&#= 39;m not seeing

    Topic 3: the benefits o= f pooling WebTransport
    =C2=A0 =C2=A0 This allows saving round tri= ps to get WebTransport up and running
    =C2=A0 =C2=A0 This allows s= haring congestion control state
    =C2=A0 =C2=A0 This allows letting= the QUIC implementation prioritize DATAGRAMs vs HTTP requests instead of r= elying on the kernel or routers which have less information
    =C2= =A0 =C2=A0 Overall, I think pooling is beneficial (though not an absolute m= ust-have)
    =C2=A0 =C2=A0 Please reply here if you know of benefits= I'm not seeing

    Topic 4: the difficulty of= pooling Http3Transport=C2=A0on the client
    =C2=A0 =C2=A0 It appea= rs that all browsers that are interested in WebTransport are implementing p= ooling in their HTTP/3 stack so additionally pooling WebTransport should no= t introduce more complexity
    =C2=A0 =C2=A0 Please reply here if yo= u know of complexities I'm not seeing

    Topic 5: the difficulty of pooling Http3Transport=C2=A0on the serve= r
    =C2=A0 =C2=A0 This one is trickier. If you have frontends= that know how to route HTTP=C2=A0requests to backends, DATAGRAM support is= going to be a whole new world.
    =C2=A0 =C2=A0 However, and I thin= k this is really important: implementing this on the server is OPTIONAL.
    =C2=A0 =C2=A0 The server can easily use a different hostname (and d= ifferent TLS certificates) for HTTP vs WebTransport and clients will not po= ol the two together.
    =C2=A0 =C2=A0 Once you use different domain = names per WebTransport object, Http3Transport=C2=A0has the exact same pooli= ng properties as QuicTransport.
    =C2=A0 =C2=A0 Please reply here i= f you know of complexities I'm not seeing

    = What am I missing?

    Thanks,
    David


    On Mon, Nov 16, 2020 at 4:45 PM Ian Swett <ianswett@google.com> wrote:=
    I'm very concerned about any functionality that requires pooling.=C2=A0 Pooling is a client-specific optimization and pooling poli= cy is subject to change(within reason) at any time.=C2=A0 If applications= =C2=A0are saying "it'd be cool if we could share congestion contro= l and loss recovery state between H3 and WebTransport most of the time"= ;, then I can see there being real(albeit small) benefits, just like there = would be for putting DataChannels and RTP into one QUIC connection for WebR= TC.=C2=A0 If people are intending to rely on pooling so an HTTP(hopefully H= 3) request can trigger a WebTransport response, I think we're in a worl= d of pain and over-optimization.

    This is more obvious in= light of the fact that a WebTransport endpoint=C2=A0is likely not a generi= c CDN endpoint, as has been clearly stated by Mark Nottingham.

    =
    Bernard's comments above point to a tighter coupling between= HTTP/3 and WebTransport than I think is practical in production, unless I = misunderstood(which I may have, it's been a long day).

    All of this makes me think we should punt the HTTP based WebTransp= ort options down the road a year or so and focus on QuicTransport=C2=A0init= ially.=C2=A0 It's not to say we won't do them, but they're clea= rly more complex than=C2=A0QuicTransport=C2=A0and it'd be good to have = real deployment experience prior to starting so we know what the requiremen= ts are and where the dragons are lurking.=C2=A0 Also, the W3C should design= APIs that make it easy to detect failure to establish a QUIC-based=C2=A0We= bTransport, and this ensures those are well exercised.=C2=A0 Maybe we DO re= quire pooling under certain conditions and describe those, but there are li= kely privacy concerns under some circumstances and I'm not enough of an= expert to know what would be acceptable to all clients.

    Some=C2=A0people in the WG may think we have to release a TCP based = WebTransport at the same time as a QUIC based one, but I don't think th= at's true and even if we standardized them at the same time, it doesn&#= 39;t mean both will achieve wide deployment at the same time.=C2=A0 As I sa= id at the mic, I don't see any reason YouTube would deploy a TCP based = WebTransport given it will have to maintain an HTTP/1.1 option for basicall= y forever and they've spent a good bit of effort to make sure that work= s as well as it can.=C2=A0 It's clear to me there are compelling use ca= ses right now for QuicTransport, but=C2=A0the driving use cases for the fal= lback are not clear to me.=C2=A0 Consistency is intellectually appealing, b= ut doesn't drive deployments.

    Ian
    <= /div>
    O= n Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    =
    David said:=C2=A0

    &quo= t;Where does this come from? A lot of QUIC servers are implementing QUIC da= tagrams, and once you have those the delta with h3 datagrams is negligible.= Additionally, multiple h3 server implementers=C2=A0have indicated they wan= t to support WebTransport. It's starting to feel like the pushback on H= TTP3Transport=C2=A0is purely based on a perception of complexity from folks= who haven't tried to implement it? If that's the case, then we sho= uld get some implementation experience to confirm or debunk that theory.&qu= ot;

    [BA] The pooling use cases often involve an in= teraction between an HTTP/3 request/response and WebTransport.=C2=A0 so the= HTTP/3 Request doesn't just elicit an HTTP/3 Response.=C2=A0 It also c= auses something else to happen, something that isn't specified in the H= TTP/3 protocol, such as eliciting a datagram flow or bi/unidirectional stre= am from the server.=C2=A0 This is what is contemplated in several of the &q= uot;Live Event" use cases, where the HTTP/3 Request/Response would be = requesting the desired Event. The major advantage over HLS is avoiding Head= -of-Line blocking, reducing video freezes and stalls.=C2=A0 So developers u= nderstand the value that support for datagrams and server-initiated streams= can provide - the question is whether they'll have all the interoperab= le pieces in place to deploy it.=C2=A0

    Just becau= se a generic HTTP/3 server supports QUIC and WebTransport, doesn't mean= that it will support these use cases.=C2=A0 I've been asked whether be= tter interoperability and wider ecosystem support could be achieved by exte= nding HTTP/3 in a way more in keeping with the existing protocol design - s= uch as by allowing an HTTP/3 Request to specify a resource to be returned i= n a flow of datagrams.=C2=A0

    The situation might b= e more tenable if the node.js framework had HTTP/3 and QUIC modules on the = horizon.

    On Mon, Nov 16, 2020 at 1:00 PM David Schinaz= i <dschina= zi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 2020= at 12:40 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    Luke said:=C2=A0
    "My primary conce= rn is that Http3Transport requires non-generic modifications to the HTTP/3 = layer mostly to support connection pooling. I'm worried that this will = limit support for Http3Transport and complicates any HTTP/3 implementation = that does support it."

    [BA] I have als= o heard this concern from developers. The concerns primarily arise from the= pooling of HTTP/3 Request/Responses with WebTransport. This does enable so= me interesting use cases, such as a Request/Response (e.g. gRPC) that can r= esult in a server sending datagrams or initiating bi-directional or uni-dir= ectional streams.=C2=A0 So there is perceived value, but the question is wh= ether that value will be widely supported across the HTTP/3 ecosystem.=C2= =A0

    At this point, most generic HTTP/3 servers are= not expected to support HTTP/3 datagrams (not part of the HTTP/3 protocol)= or Http3Transport (perceived as a niche protocol), so that pooling would o= nly be possible when using a framework.=C2=A0 node.js will not have=C2=A0QU= IC support for 12-18 months (held up by OpenSSL) so even framework support = is expected to be limited.

    Wher= e does this come from? A lot of QUIC servers are implementing QUIC datagram= s, and once you have those the delta with h3 datagrams is negligible. Addit= ionally, multiple h3 server implementers=C2=A0have indicated they want to s= upport WebTransport. It's starting to feel like the pushback on HTTP3Tr= ansport=C2=A0is purely based on a perception of complexity from folks who h= aven't tried to implement it? If that's the case, then we should ge= t some implementation experience to confirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020= at 11:37 AM David Schinazi <dschinazi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 2020 at 11:34 AM Luke Curley <kixelated@gmail.com> wrote:
    =
    We= 're on the same page that there's code in HTTP/3 that could be leve= raged for QuicTransport in the form of the header parsing. I think there= 9;s a path to merge QuicTransport and Http3Transport by leveraging HTTP/3 f= or the handshake and QUIC for stream delivery.

    My primar= y concern is that Http3Transport requires non-generic modifications to the = HTTP/3 layer mostly to support connection pooling. I'm worried that thi= s will limit support for Http3Transport and complicates any HTTP/3 implemen= tation that does support it.

    Hi= Luke,

    I'm curious, could you elaborate on wha= t these "non-generic modifications to the HTTP/3 layer" are pleas= e?

    Thanks,
    David
    =C2=A0
    <= blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l= eft:1px solid rgb(204,204,204);padding-left:1ex">
    On Mon, Nov 16, 2020 at 4:49 AM Luca= s Pardue <lucaspardue.24.7@gmail.com> wrote:
    Hi Luke,

    On Mon, 16 Nov 2020, 12:26 Luke Curley, <kixelated@gmail.com> wrot= e:
    Just to clarify, when I say "QuicTransport is simpler" I= really mean "QuicTransport has greater interoperability". You ca= n take any QUIC implementation (+ datagram extension) and add a thin layer = to support QuicTransport. It's a nice layering of protocols and it'= s something that I want to see in general as QUIC replaces TCP.
    =

    Than= ks for the clarification. I appreciate the sentiment. But given the develop= ment of QUIC its kind of surprising that people would find it easier to ide= ntify an implementation that supports QUIC and datagram but does not suppor= t HTTP/3.

    Thr situation = for a more clean-room implementation is different, I agree. However, by the= time you've done all the hard stuff with QUIC, a very focused HTTP/3 l= ayer ends up quite thin too. You can ignore dynamic compression, server pus= h and extensibility points.

    I also see the current design being the thin end of the wedge. The prop= osal I linked talks about HTTP-like header parsing. So its "just"= a thin layer to do some parsing. Then folks will probably want some want t= o tweak parameter, acontrol channel, a way to do graceful close, a sprinkle= of GREASE. To extrapolate forward, what would be the delta be between some= final product QuicTransport and HTTP/3. Too small a delta and we've wa= sted years of effort.

    Ch= eers
    Lucas



    On Mon, Nov 16, 2020 at 3:16= AM Lucas Pardue <lucaspardue.24.7@gmail.com> wrote:
    <= /div>
    Hi folks,

    To follow up on one thread of discussi= on during IETF 109. To over simplify what we've heard a few folks say, = they prefer QuicTransport because it simpler and they don't need poolin= g.

    I'd like to push more on this, what is the = measurable complexity of HTTP/3 over QUIC plus a new application mapping th= at needs to be defined? Let's isolate pooling as a variable and ignore = it.

    Victor mentioned his proposal for a unified he= ader semantic across all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtra= ns-overview/pull/4/files. Taking a closer look at it, I have some conce= rns that I added as comments. HTTP has semantics for a reason. If QuicTran= sport is going to start borrowing HTTP piecemeal, I really wonder how simpl= e people might feel it is. I think it's important to avoid something th= at looks like HTTP but behaves differently. Is it really much of a stretch = to just do HTTP/3 but give it a different ALPN so that we avoid problems re= lated to cross-protocol pooling?

    Cheers,
    Lucas
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    --00000000000065649105b446c6ed-- From nobody Mon Nov 16 23:35:37 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1B5BB3A115A for ; Mon, 16 Nov 2020 23:35:36 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GdyYLlE9o4RF for ; Mon, 16 Nov 2020 23:35:32 -0800 (PST) Received: from mail-ot1-x330.google.com (mail-ot1-x330.google.com [IPv6:2607:f8b0:4864:20::330]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 51E403A1152 for ; Mon, 16 Nov 2020 23:35:32 -0800 (PST) Received: by mail-ot1-x330.google.com with SMTP id f16so18495625otl.11 for ; Mon, 16 Nov 2020 23:35:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=8g0rzUXEdXWFU6KV07J4zU6USvLqlpz0WBR5uqieJ+M=; b=PwX7ZnHA/Xn70P4O7i/Mc3PSaLTAri9ACqZQCXa+LKdTd0IRPfJCOd6mDYh+GUNRmk 1wIrhTEsbFPOMQSHWD0IvpUtskYCv6QP3mIUQxC5k1X/N7fCSuB/02+YO7up+hbS7K3Y YERfwUm63HRMYilZmPaeKeztKkBpup6RZHFOYWCSo60yKKOA0qKn/ilf1/jQJO+/B5pV SWJjJnVhIawx4JaXfVBy5Lsy+ySwvC7dZTC7/Mzz3vwY4LWlF3/kpNaBrB+LfTFG2kOr Yom12owYe3G0lhSe4yqnYI+OX+im+gsPkmuIbYnLfLunRTb+UCLfXzfVRTwb+3VxO/RS FCug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=8g0rzUXEdXWFU6KV07J4zU6USvLqlpz0WBR5uqieJ+M=; b=X0T2X4VrXg0UzqVIF2OKMsjcvvK9NzatX8HZW1ryl5+XJClLvji3k/jv6495pVCWU4 SuoEFfGxXeBbS+eBWTwUsDLIy8F5DYzTo+mzNvCzCsD3NyTc8zIXuIKyUZAcu6imM62L sFKoZqQOXynQz6aDMvOoRsuDb4yajfVy/06WMZMvf1u8vv8mNNXYOi32XmUAVjC9UXFC rrynB6uprFqhK23sT20GgcbV+w2aFfeM1ninLWXgWXaVFJnLYm1a9PYLr7WOt/JfvplE aO0/vlvL5WpaJekN/bcL9xZKMp1TvMUsHO2qhLBabWLZpBs093uzaiv/XlA9N2EvMKZv VWnQ== X-Gm-Message-State: AOAM5312uHiYw9WoiBDwCgu8QIdljSVkwGCzddmmNSkYdZwQBQICmsqv QD19+P6gpM9kIGJ0xEylpSi6N/zDKaoRdS5MEDY= X-Google-Smtp-Source: ABdhPJxXcKwJuHMnW5mFrVojK4hJQGPHi26Q+Bjx76pUetXl44S278GsfPT0FARKn0oKzbuR79bYCclxyG25mrGoCo8= X-Received: by 2002:a05:6830:22da:: with SMTP id q26mr2250830otc.127.1605598531490; Mon, 16 Nov 2020 23:35:31 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Luke Curley Date: Mon, 16 Nov 2020 23:35:21 -0800 Message-ID: To: David Schinazi Cc: Ian Swett , Bernard Aboba , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="0000000000001f165e05b4488a4e" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 07:35:36 -0000 --0000000000001f165e05b4488a4e Content-Type: text/plain; charset="UTF-8" Hey David, I gave a quick presentation on my use-case yesterday. We're using HLS so all media delivery is currently HTTP-based and we would love to use HTTP/3. However, reducing latency requires a tighter feedback loop and some form of push. The HTTP request/response model just complicates things, especially when HTTP push is brought into the equation. QuicTransport is much simpler and allows us to build something closer to RTMP on top. It also means that we can use the same protocol for both distribution and contribution. On Mon, Nov 16, 2020 at 9:29 PM David Schinazi wrote: > > > On Mon, Nov 16, 2020 at 6:02 PM Luke Curley wrote: > >> I think that's a good starting summary David. Some things worth >> mentioning: >> >> For 1 and 4, Twitch is using QuicTransport for both native applications >> (ex. mobile, desktop, devices) and web applications. It's minor, but we >> benefit from the ability to use any QUIC library (technically we don't >> implement datagrams...) instead only those with HTTP/3 and Http3Transport >> support. I think this context was missing in the previous discussions. >> > > Can you clarify which implementations you were considering that support > QUIC+DATAGRAM but not HTTP/3? > > >> For 3, QuicTransport can support 0-RTT if we declare the path/origin >> handshake to be idempotent >> ... unless the new >> connection is routed to a different host. Both pooled Http3Transport and a >> new QuicTransport connection could take the same number of round trips. >> > > 0-RTT state isn't saved across ALPNs, even if it's to the same host. So > Http3Transport would get inline 0-RTT but QuicTransport would not get 0-RTT > unless you've already performed a QuicTransport handshake in recent history. > > >> For 4 and 5, I'm worried about flow control >> . tl;dr a >> Http3Transport session could easily exhaust flow control limits for the >> entire connection. This seems especially negative if pooling is performed >> transparently (ex. a Http3Transport session may silently break HTTP/3 or >> other sessions). >> > > Unintentionally hitting the connection-level flow control limit is a > serious implementation bug. I wouldn't expect this to still be a problem > once implementations mature. I wouldn't want to base our protocol choices > based on a bug in non-production-ready implementations. > > >> On Mon, Nov 16, 2020 at 5:10 PM David Schinazi >> wrote: >> >>> I'd like us to take a step back, I think we're conflating many different >>> topics here, and it's making it impossible to reason about this (at least >>> for someone running on not enough sleep like I am this week). >>> >>> Topic 1: the complexity of implementing Http3Transport as opposed to >>> QuicTransport on the client >>> From my perspective, all browsers interested in WebTransport are >>> implementing HTTP/3, so I don't see much complexity there. >>> Please reply here if you know of complexities I'm not seeing >>> >>> Topic 2: the complexity of implementing Http3Transport as opposed to >>> QuicTransport on the server >>> As far as I know, most server-side QUIC stacks also support HTTP/3, >>> and for QuicTransport they already have DATAGRAM support so I think the >>> delta is negligible. >>> Please reply here if you know of complexities I'm not seeing >>> >>> Topic 3: the benefits of pooling WebTransport >>> This allows saving round trips to get WebTransport up and running >>> This allows sharing congestion control state >>> This allows letting the QUIC implementation prioritize DATAGRAMs vs >>> HTTP requests instead of relying on the kernel or routers which have less >>> information >>> Overall, I think pooling is beneficial (though not an absolute >>> must-have) >>> Please reply here if you know of benefits I'm not seeing >>> >>> Topic 4: the difficulty of pooling Http3Transport on the client >>> It appears that all browsers that are interested in WebTransport are >>> implementing pooling in their HTTP/3 stack so additionally pooling >>> WebTransport should not introduce more complexity >>> Please reply here if you know of complexities I'm not seeing >>> >>> Topic 5: the difficulty of pooling Http3Transport on the server >>> This one is trickier. If you have frontends that know how to route >>> HTTP requests to backends, DATAGRAM support is going to be a whole new >>> world. >>> However, and I think this is really important: implementing this on >>> the server is OPTIONAL. >>> The server can easily use a different hostname (and different TLS >>> certificates) for HTTP vs WebTransport and clients will not pool the two >>> together. >>> Once you use different domain names per WebTransport object, >>> Http3Transport has the exact same pooling properties as QuicTransport. >>> Please reply here if you know of complexities I'm not seeing >>> >>> What am I missing? >>> >>> Thanks, >>> David >>> >>> >>> On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: >>> >>>> I'm *very* concerned about any functionality that *requires* pooling. >>>> Pooling is a client-specific optimization and pooling policy is subject to >>>> change(within reason) at any time. If applications are saying "it'd be >>>> cool if we could share congestion control and loss recovery state between >>>> H3 and WebTransport most of the time", then I can see there being >>>> real(albeit small) benefits, just like there would be for putting >>>> DataChannels and RTP into one QUIC connection for WebRTC. If people are >>>> intending to rely on pooling so an HTTP(hopefully H3) request can trigger a >>>> WebTransport response, I think we're in a world of pain and >>>> over-optimization. >>>> >>>> This is more obvious in light of the fact that a WebTransport >>>> endpoint is likely not a generic CDN endpoint, as has been clearly stated >>>> by Mark Nottingham. >>>> >>>> Bernard's comments above point to a tighter coupling between HTTP/3 and >>>> WebTransport than I think is practical in production, unless I >>>> misunderstood(which I may have, it's been a long day). >>>> >>>> All of this makes me think we should punt the HTTP based WebTransport >>>> options down the road a year or so and focus on QuicTransport initially. >>>> It's not to say we won't do them, but they're clearly more complex >>>> than QuicTransport and it'd be good to have real deployment experience >>>> prior to starting so we know what the requirements are and where the >>>> dragons are lurking. Also, the W3C should design APIs that make it easy to >>>> detect failure to establish a QUIC-based WebTransport, and this ensures >>>> those are well exercised. Maybe we DO require pooling under certain >>>> conditions and describe those, but there are likely privacy concerns under >>>> some circumstances and I'm not enough of an expert to know what would be >>>> acceptable to all clients. >>>> >>>> Some people in the WG may think we have to release a TCP based >>>> WebTransport at the same time as a QUIC based one, but I don't think that's >>>> true and even if we standardized them at the same time, it doesn't mean >>>> both will achieve wide deployment at the same time. As I said at the mic, >>>> I don't see any reason YouTube would deploy a TCP based WebTransport given >>>> it will have to maintain an HTTP/1.1 option for basically forever and >>>> they've spent a good bit of effort to make sure that works as well as it >>>> can. It's clear to me there are compelling use cases right now for >>>> QuicTransport, but the driving use cases for the fallback are not clear to >>>> me. Consistency is intellectually appealing, but doesn't drive deployments. >>>> >>>> Ian >>>> >>>> On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba >>>> wrote: >>>> >>>>> David said: >>>>> >>>>> "Where does this come from? A lot of QUIC servers are implementing >>>>> QUIC datagrams, and once you have those the delta with h3 datagrams is >>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>> who haven't tried to implement it? If that's the case, then we should get >>>>> some implementation experience to confirm or debunk that theory." >>>>> >>>>> [BA] The pooling use cases often involve an interaction between an >>>>> HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn't >>>>> just elicit an HTTP/3 Response. It also causes something else to happen, >>>>> something that isn't specified in the HTTP/3 protocol, such as eliciting a >>>>> datagram flow or bi/unidirectional stream from the server. This is what is >>>>> contemplated in several of the "Live Event" use cases, where the HTTP/3 >>>>> Request/Response would be requesting the desired Event. The major advantage >>>>> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >>>>> stalls. So developers understand the value that support for datagrams and >>>>> server-initiated streams can provide - the question is whether they'll have >>>>> all the interoperable pieces in place to deploy it. >>>>> >>>>> Just because a generic HTTP/3 server supports QUIC and WebTransport, >>>>> doesn't mean that it will support these use cases. I've been asked whether >>>>> better interoperability and wider ecosystem support could be achieved by >>>>> extending HTTP/3 in a way more in keeping with the existing protocol design >>>>> - such as by allowing an HTTP/3 Request to specify a resource to be >>>>> returned in a flow of datagrams. >>>>> >>>>> The situation might be more tenable if the node.js framework had >>>>> HTTP/3 and QUIC modules on the horizon. >>>>> >>>>> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi < >>>>> dschinazi.ietf@gmail.com> wrote: >>>>> >>>>>> >>>>>> >>>>>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba < >>>>>> bernard.aboba@gmail.com> wrote: >>>>>> >>>>>>> Luke said: >>>>>>> >>>>>>> "My primary concern is that Http3Transport requires non-generic >>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>> HTTP/3 implementation that does support it." >>>>>>> >>>>>>> [BA] I have also heard this concern from developers. The concerns >>>>>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>>>>> WebTransport. This does enable some interesting use cases, such as a >>>>>>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>>>>>> or initiating bi-directional or uni-directional streams. So there is >>>>>>> perceived value, but the question is whether that value will be widely >>>>>>> supported across the HTTP/3 ecosystem. >>>>>>> >>>>>>> At this point, most generic HTTP/3 servers are not expected to >>>>>>> support HTTP/3 datagrams (not part of the HTTP/3 protocol) or >>>>>>> Http3Transport (perceived as a niche protocol), so that pooling would only >>>>>>> be possible when using a framework. node.js will not have QUIC support for >>>>>>> 12-18 months (held up by OpenSSL) so even framework support is expected to >>>>>>> be limited. >>>>>>> >>>>>> >>>>>> Where does this come from? A lot of QUIC servers are implementing >>>>>> QUIC datagrams, and once you have those the delta with h3 datagrams is >>>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>>> who haven't tried to implement it? If that's the case, then we should get >>>>>> some implementation experience to confirm or debunk that theory. >>>>>> >>>>>> >>>>>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>>>>> wrote: >>>>>>>> >>>>>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>>>>> leveraged for QuicTransport in the form of the header parsing. I think >>>>>>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>>>>> >>>>>>>>> My primary concern is that Http3Transport requires non-generic >>>>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>>>> HTTP/3 implementation that does support it. >>>>>>>>> >>>>>>>> >>>>>>>> Hi Luke, >>>>>>>> >>>>>>>> I'm curious, could you elaborate on what these "non-generic >>>>>>>> modifications to the HTTP/3 layer" are please? >>>>>>>> >>>>>>>> Thanks, >>>>>>>> David >>>>>>>> >>>>>>>> >>>>>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> Hi Luke, >>>>>>>>>> >>>>>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, >>>>>>>>>> wrote: >>>>>>>>>> >>>>>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really >>>>>>>>>>> mean "QuicTransport has greater interoperability". You can take any QUIC >>>>>>>>>>> implementation (+ datagram extension) and add a thin layer to support >>>>>>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Thanks for the clarification. I appreciate the sentiment. But >>>>>>>>>> given the development of QUIC its kind of surprising that people would find >>>>>>>>>> it easier to identify an implementation that supports QUIC and datagram but >>>>>>>>>> does not support HTTP/3. >>>>>>>>>> >>>>>>>>>> Thr situation for a more clean-room implementation is different, >>>>>>>>>> I agree. However, by the time you've done all the hard stuff with QUIC, a >>>>>>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>>>>>>>> compression, server push and extensibility points. >>>>>>>>>> >>>>>>>>>> I also see the current design being the thin end of the wedge. >>>>>>>>>> The proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>>>>>> years of effort. >>>>>>>>>> >>>>>>>>>> Cheers >>>>>>>>>> Lucas >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>>> >>>>>>>>>>>> Hi folks, >>>>>>>>>>>> >>>>>>>>>>>> To follow up on one thread of discussion during IETF 109. To >>>>>>>>>>>> over simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>>>>> >>>>>>>>>>>> I'd like to push more on this, what is the measurable >>>>>>>>>>>> complexity of HTTP/3 over QUIC plus a new application mapping that needs to >>>>>>>>>>>> be defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>>>>> >>>>>>>>>>>> Victor mentioned his proposal for a unified header semantic >>>>>>>>>>>> across all transports, this is >>>>>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>>>>> cross-protocol pooling? >>>>>>>>>>>> >>>>>>>>>>>> Cheers, >>>>>>>>>>>> Lucas >>>>>>>>>>>> -- >>>>>>>>>>>> Webtransport mailing list >>>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>> Webtransport mailing list >>>>>>>>> Webtransport@ietf.org >>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>> >>>>>>>> -- >>>>>>>> Webtransport mailing list >>>>>>>> Webtransport@ietf.org >>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>> >>>>>>> -- >>>>> Webtransport mailing list >>>>> Webtransport@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>> >>>> --0000000000001f165e05b4488a4e Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Hey David, I gave a quick presentation on my use-case yest= erday. We're using HLS so=C2=A0all media delivery is currently HTTP-bas= ed and we would love to use HTTP/3.=C2=A0

    However, reduc= ing latency requires a tighter feedback loop and some form of push. The HTT= P request/response model just complicates things,=C2=A0especially when HTTP= push is brought into the equation. QuicTransport is much simpler and allow= s us to build something closer to RTMP on top. It also means that we can us= e the same protocol for both distribution and contribution.

    =
    On Mon, No= v 16, 2020 at 9:29 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:


    On = Mon, Nov 16, 2020 at 6:02 PM Luke Curley <kixelated@gmail.com> wrote:
    I think that= 's a good starting summary David. Some things worth mentioning:
    For 1 and 4, Twitch is using QuicTransport for both native appl= ications (ex. mobile, desktop, devices) and web applications. It's mino= r, but we benefit from the ability to use any QUIC library (technically we = don't implement datagrams...) instead only those with HTTP/3 and Http3T= ransport support. I think this context was missing in the previous discussi= ons.

    Can you clarify which impl= ementations you were considering that support QUIC+DATAGRAM but not HTTP/3?=
    =C2=A0
    For 3, QuicTransport can support 0-RTT if we decla= re the path/origin handshake to be=C2=A0idempotent... unless the new co= nnection is routed to a different host. Both pooled Http3Transport and a ne= w QuicTransport connection could take the same number of round trips.
    =

    0-RTT state isn't saved across A= LPNs, even if it's to the same host. So Http3Transport=C2=A0would get i= nline 0-RTT but QuicTransport would not get 0-RTT unless you've already= performed a QuicTransport handshake in recent history.
    =C2=A0
    = For 4 and 5, I'm worried about flow control. tl;dr a Http3Tran= sport session could easily exhaust flow control limits for the entire conne= ction. This seems especially negative if pooling is performed transparently= (ex. a Http3Transport session may silently break HTTP/3 or other sessions)= .

    Unintentionally hitting the c= onnection-level=C2=A0flow control limit is a serious implementation bug. I = wouldn't expect this to still be a problem once implementations mature.= I wouldn't want to base our protocol choices based on a bug in non-pro= duction-ready implementations.
    =C2=A0
    On Mon, Nov 16, 2020 at 5:10 PM David Schinazi <dschinazi.ietf@gmai= l.com> wrote:
    I'd like us to take a step back, I think we'r= e conflating many different topics here, and it's making it impossible = to reason about this (at least for someone running on not enough sleep like= I am this week).

    Topic 1: the complexity of implementin= g=C2=A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the client
    =C2=A0 =C2=A0 From my perspective, all browsers interested in WebT= ransport are implementing HTTP/3, so I don't see much complexity there.=
    =C2=A0 =C2=A0 Please reply here if you know of complexities I= 9;m not seeing

    Topic 2: the complexity of imp= lementing=C2=A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the = server
    =C2=A0 =C2=A0 As far as I know, most server-side QUI= C stacks also support HTTP/3, and for QuicTransport=C2=A0they already have = DATAGRAM support so I think the delta is negligible.
    =C2=A0 =C2= =A0 Please reply here if you know of complexities I'm not seeing
    <= div>

    Topic 3: the benefits of pooling WebTransport=
    =C2=A0 =C2=A0 This allows saving round trips to get WebTransport= up and running
    =C2=A0 =C2=A0 This allows sharing congestion cont= rol state
    =C2=A0 =C2=A0 This allows letting the QUIC implementati= on prioritize DATAGRAMs vs HTTP requests instead of relying on the kernel o= r routers which have less information
    =C2=A0 =C2=A0 Overall, I th= ink pooling is beneficial (though not an absolute must-have)
    =C2= =A0 =C2=A0 Please reply here if you know of benefits I'm not seeing
    =

    Topic 4: the difficulty of pooling Http3Transport= =C2=A0on the client
    =C2=A0 =C2=A0 It appears that all browsers th= at are interested in WebTransport are implementing pooling in their HTTP/3 = stack so additionally pooling WebTransport should not introduce more comple= xity
    =C2=A0 =C2=A0 Please reply here if you know of complexities = I'm not seeing

    Topic 5: the di= fficulty of pooling Http3Transport=C2=A0on the server
    =C2= =A0 =C2=A0 This one is trickier. If you have frontends that know how to rou= te HTTP=C2=A0requests to backends, DATAGRAM support is going to be a whole = new world.
    =C2=A0 =C2=A0 However, and I think this is really impo= rtant: implementing this on the server is OPTIONAL.
    =C2=A0 =C2=A0= The server can easily use a different hostname (and different TLS certific= ates) for HTTP vs WebTransport and clients will not pool the two together.<= /div>
    =C2=A0 =C2=A0 Once you use different domain names per WebTranspor= t object, Http3Transport=C2=A0has the exact same pooling properties as Quic= Transport.
    =C2=A0 =C2=A0 Please reply here if you know of complex= ities I'm not seeing

    What am I missing?

    Thanks,
    David

    On Mon, = Nov 16, 2020 at 4:45 PM Ian Swett <ianswett@google.com> wrote:
    I'm very= concerned about any functionality that requires pooling.=C2=A0 Pool= ing is a client-specific optimization and pooling policy is subject to chan= ge(within reason) at any time.=C2=A0 If applications=C2=A0are saying "= it'd be cool if we could share congestion control and loss recovery sta= te between H3 and WebTransport most of the time", then I can see there= being real(albeit small) benefits, just like there would be for putting Da= taChannels and RTP into one QUIC connection for WebRTC.=C2=A0 If people are= intending to rely on pooling so an HTTP(hopefully H3) request can trigger = a WebTransport response, I think we're in a world of pain and over-opti= mization.

    This is more obvious in light of the fact that= a WebTransport endpoint=C2=A0is likely not a generic CDN endpoint, as has = been clearly stated by Mark Nottingham.

    Bernard'= s comments above point to a tighter coupling between HTTP/3 and WebTranspor= t than I think is practical in production, unless I misunderstood(which I m= ay have, it's been a long day).

    All of this ma= kes me think we should punt the HTTP based WebTransport options down the ro= ad a year or so and focus on QuicTransport=C2=A0initially.=C2=A0 It's n= ot to say we won't do them, but they're clearly more complex than= =C2=A0QuicTransport=C2=A0and it'd be good to have real deployment exper= ience prior to starting so we know what the requirements are and where the = dragons are lurking.=C2=A0 Also, the W3C should design APIs that make it ea= sy to detect failure to establish a QUIC-based=C2=A0WebTransport, and this = ensures those are well exercised.=C2=A0 Maybe we DO require pooling under c= ertain conditions and describe those, but there are likely privacy concerns= under some circumstances and I'm not enough of an expert to know what = would be acceptable to all clients.

    Some=C2=A0peop= le in the WG may think we have to release a TCP based WebTransport at the s= ame time as a QUIC based one, but I don't think that's true and eve= n if we standardized them at the same time, it doesn't mean both will a= chieve wide deployment at the same time.=C2=A0 As I said at the mic, I don&= #39;t see any reason YouTube would deploy a TCP based WebTransport given it= will have to maintain an HTTP/1.1 option for basically forever and they= 9;ve spent a good bit of effort to make sure that works as well as it can.= =C2=A0 It's clear to me there are compelling use cases right now for Qu= icTransport, but=C2=A0the driving use cases for the fallback are not clear = to me.=C2=A0 Consistency is intellectually appealing, but doesn't drive= deployments.

    Ian

    On Mon, Nov 16, 2020= at 6:36 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    David said:=C2=A0

    "Where does this c= ome from? A lot of QUIC servers are implementing QUIC datagrams, and once y= ou have those the delta with h3 datagrams is negligible. Additionally, mult= iple h3 server implementers=C2=A0have indicated they want to support WebTra= nsport. It's starting to feel like the pushback on HTTP3Transport=C2=A0= is purely based on a perception of complexity from folks who haven't tr= ied to implement it? If that's the case, then we should get some implem= entation experience to confirm or debunk that theory."

    <= /div>
    [BA] The pooling use cases often involve an interaction between a= n HTTP/3 request/response and WebTransport.=C2=A0 so the HTTP/3 Request doe= sn't just elicit an HTTP/3 Response.=C2=A0 It also causes something els= e to happen, something that isn't specified in the HTTP/3 protocol, suc= h as eliciting a datagram flow or bi/unidirectional stream from the server.= =C2=A0 This is what is contemplated in several of the "Live Event"= ; use cases, where the HTTP/3 Request/Response would be requesting the desi= red Event. The major advantage over HLS is avoiding Head-of-Line blocking, = reducing video freezes and stalls.=C2=A0 So developers understand the value= that support for datagrams and server-initiated streams can provide - the = question is whether they'll have all the interoperable pieces in place = to deploy it.=C2=A0

    Just because a generic HTTP/3= server supports QUIC and WebTransport, doesn't mean that it will suppo= rt these use cases.=C2=A0 I've been asked whether better interoperabili= ty and wider ecosystem support could be achieved by extending HTTP/3 in a w= ay more in keeping with the existing protocol design - such as by allowing = an HTTP/3 Request to specify a resource to be returned in a flow of datagra= ms.=C2=A0

    The situation might be more tenable if t= he node.js framework had HTTP/3 and QUIC modules on the horizon.
    <= /div>

    On Mon, Nov 16, 2020 at 1:00 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 2020 at 12:40 PM Bernar= d Aboba <be= rnard.aboba@gmail.com> wrote:
    Luke said:=C2=A0

    &= quot;My primary concern is that Http3Tra= nsport requires non-generic modifications to the HTTP/3 layer mostly to sup= port connection pooling. I'm worried that this will limit support for H= ttp3Transport and complicates any HTTP/3 implementation that does support i= t."

    [BA] I have also heard this concer= n from developers. The concerns primarily arise from the pooling of HTTP/3 = Request/Responses with WebTransport. This does enable some interesting use = cases, such as a Request/Response (e.g. gRPC) that can result in a server s= ending datagrams or initiating bi-directional or uni-directional streams.= =C2=A0 So there is perceived value, but the question is whether that value = will be widely supported across the HTTP/3 ecosystem.=C2=A0

    <= /div>
    At this point, most generic HTTP/3 servers are not expected to su= pport HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport = (perceived as a niche protocol), so that pooling would only be possible whe= n using a framework.=C2=A0 node.js will not have=C2=A0QUIC support for 12-1= 8 months (held up by OpenSSL) so even framework support is expected to be l= imited.

    Where does this come fr= om? A lot of QUIC servers are implementing QUIC datagrams, and once you hav= e those the delta with h3 datagrams is negligible. Additionally, multiple h= 3 server implementers=C2=A0have indicated they want to support WebTransport= . It's starting to feel like the pushback on HTTP3Transport=C2=A0is pur= ely based on a perception of complexity from folks who haven't tried to= implement it? If that's the case, then we should get some implementati= on experience to confirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David S= chinazi <d= schinazi.ietf@gmail.com> wrote:


    On Mon, Nov 16= , 2020 at 11:34 AM Luke Curley <kixelated@gmail.com> wrote:
    We're on the same = page that there's code in HTTP/3 that could be leveraged for QuicTransp= ort in the form of the header parsing. I think there's a path to merge = QuicTransport and Http3Transport by leveraging HTTP/3 for the handshake and= QUIC for stream delivery.

    My primary concern is that Ht= tp3Transport requires non-generic modifications to the HTTP/3 layer mostly = to support connection pooling. I'm worried that this will limit support= for Http3Transport and complicates any HTTP/3 implementation that does sup= port it.

    Hi Luke,
    I'm curious, could you elaborate on what these "non-ge= neric modifications to the HTTP/3 layer" are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@g= mail.com> wrote:
    Hi Luke,

    On Mo= n, 16 Nov 2020, 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clari= fy, when I say "QuicTransport is simpler" I really mean "Qui= cTransport has greater interoperability". You can take any QUIC implem= entation (+ datagram extension) and add a thin layer to support QuicTranspo= rt. It's a nice layering of protocols and it's something that I wan= t to see in general as QUIC replaces TCP.

    Thanks for the clarificati= on. I appreciate the sentiment. But given the development of QUIC its kind = of surprising that people would find it easier to identify an implementatio= n that supports QUIC and datagram but does not support HTTP/3.

    Thr situation for a more clean-room = implementation is different, I agree. However, by the time you've done = all the hard stuff with QUIC, a very focused HTTP/3 layer ends up quite thi= n too. You can ignore dynamic compression, server push and extensibility po= ints.

    I also see the cur= rent design being the thin end of the wedge. The proposal I linked talks ab= out HTTP-like header parsing. So its "just" a thin layer to do so= me parsing. Then folks will probably want some want to tweak parameter, aco= ntrol channel, a way to do graceful close, a sprinkle of GREASE. To extrapo= late forward, what would be the delta be between some final product QuicTra= nsport and HTTP/3. Too small a delta and we've wasted years of effort.<= /div>

    Cheers
    Lucas



    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <= ;lucaspardue.24.7@gmail.com> wrote:
    Hi folks,

    To follow up on one thread of discussion during IETF 109. = To over simplify what we've heard a few folks say, they prefer QuicTran= sport because it simpler and they don't need pooling.

    I'd like to push more on this, what is the measurable complexit= y of HTTP/3 over QUIC plus a new application mapping that needs to be defin= ed? Let's isolate pooling as a variable and ignore it.

    Victor mentioned his proposal for a unified header semantic across= all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/f= iles. Taking a closer look at it, I have some concerns that I added as = comments. HTTP has semantics for a reason. If QuicTransport is going to st= art borrowing HTTP piecemeal, I really wonder how simple people might feel = it is. I think it's important to avoid something that looks like HTTP b= ut behaves differently. Is it really much of a stretch to just do HTTP/3 bu= t give it a different ALPN so that we avoid problems related to cross-proto= col pooling?

    Cheers,
    Lucas
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    --0000000000001f165e05b4488a4e-- From nobody Mon Nov 16 23:40:47 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D8EBF3A1162 for ; Mon, 16 Nov 2020 23:40:45 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Pc7nzgul9WP9 for ; Mon, 16 Nov 2020 23:40:42 -0800 (PST) Received: from mail-lj1-x22a.google.com (mail-lj1-x22a.google.com [IPv6:2a00:1450:4864:20::22a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 5B04A3A1164 for ; Mon, 16 Nov 2020 23:40:42 -0800 (PST) Received: by mail-lj1-x22a.google.com with SMTP id s9so23109424ljo.11 for ; Mon, 16 Nov 2020 23:40:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=f6mu/WvsS1mg7PyayDC9xAS9W3DfWaXGqDaTH8Md9MI=; b=uO4ZZnqmBoRTEssnxQfc0nIPEjQrNIOZeSlPvOiFnYKCCeim0+Cetd3t9uE3kVvsDJ KLf/l2L524XO2dy375x1EIAylNB2QjzMKN7mf718GC6WlsSKpNgaFo6Exnv/9ka4KwtF Ev3JPYUkkmCzqdqTvxTY5g3qaACjMbyxBy9Cr/Un57QUV2yURF1k4VO2z5D4uExdLZej QEGMXIX4hMUFF0coIBPpHvaNu4TuwPEOA/FyXuTmvIj2dYmn+3+cO2IAAE8qKGlQ1n/K qbrrvgPbgldJePuirjt3PlBad/z3A3t/Z99MEtcabrUChIiiPp4Tzy+golw6+y1+CoDQ jjUg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=f6mu/WvsS1mg7PyayDC9xAS9W3DfWaXGqDaTH8Md9MI=; b=tbikUAeMBE3ttx1lpmyV2MTIzh26GGFEbCefwUbNaElc8Ea7hNjo+GJ7Fi6OJeCvZJ o9fX4NpoQOG299l+/MVId3Bv2mm17O3GmfP3Nsl/lrywMcff+bFZ0YqnIIGFtnaBFZtL xTYoWjBsIqce1rhhtL4sdNJ3vzEhQRnb2+/ELM1L+HhCU1j4mZVbr09f7HHMIzJj42HV +tD7pqiQlylVzVXNHnTBK+BkgyQnXm4u5s0ey900Ghk0O+q+J4Od606dpwrmelwkxBYz D6Ko+1BP4mLkleVOWw1fPv/HKW4qa3deKBMteVsOeHcQIYHX1mc9YoXs0Ga6x9LvRgYO 77pg== X-Gm-Message-State: AOAM533446IwuFDfkj021EcQNv1nJzywQG8sV+35r0gPvv3vsPe0QbTK fzVvsUqOP9CeRSSfepljVKlCUlAZFzOLgNmOlCI= X-Google-Smtp-Source: ABdhPJzSzasWlZvJHONf5wK6WBUM/ZDxJimhWtZvBl2+sfe7ERw2B0DKaTacBXFLBi11FeiGDOEJLia4M8ZIYreg568= X-Received: by 2002:a2e:b529:: with SMTP id z9mr1230604ljm.307.1605598840322; Mon, 16 Nov 2020 23:40:40 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: David Schinazi Date: Mon, 16 Nov 2020 23:40:28 -0800 Message-ID: To: Luke Curley Cc: Ian Swett , Bernard Aboba , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="000000000000877db105b4489cc3" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 07:40:46 -0000 --000000000000877db105b4489cc3 Content-Type: text/plain; charset="UTF-8" On Mon, Nov 16, 2020 at 11:35 PM Luke Curley wrote: > Hey David, I gave a quick presentation on my use-case yesterday. We're > using HLS so all media delivery is currently HTTP-based and we would love > to use HTTP/3. > And it was a great presentation! Your use case makes sense to me. > However, reducing latency requires a tighter feedback loop and some form > of push. The HTTP request/response model just complicates > things, especially when HTTP push is brought into the equation. > QuicTransport is much simpler and allows us to build something closer to > RTMP on top. > I don't understand this, can you clarify? What does the HTTP request/response model have to do with the Http3Transport vs QuicTransport question? > It also means that we can use the same protocol for both distribution and > contribution. > I apologize, but I don't understand this either. What same protocol? On Mon, Nov 16, 2020 at 9:29 PM David Schinazi > wrote: > >> >> >> On Mon, Nov 16, 2020 at 6:02 PM Luke Curley wrote: >> >>> I think that's a good starting summary David. Some things worth >>> mentioning: >>> >>> For 1 and 4, Twitch is using QuicTransport for both native applications >>> (ex. mobile, desktop, devices) and web applications. It's minor, but we >>> benefit from the ability to use any QUIC library (technically we don't >>> implement datagrams...) instead only those with HTTP/3 and Http3Transport >>> support. I think this context was missing in the previous discussions. >>> >> >> Can you clarify which implementations you were considering that support >> QUIC+DATAGRAM but not HTTP/3? >> >> >>> For 3, QuicTransport can support 0-RTT if we declare the path/origin >>> handshake to be idempotent >>> ... unless the new >>> connection is routed to a different host. Both pooled Http3Transport and a >>> new QuicTransport connection could take the same number of round trips. >>> >> >> 0-RTT state isn't saved across ALPNs, even if it's to the same host. So >> Http3Transport would get inline 0-RTT but QuicTransport would not get 0-RTT >> unless you've already performed a QuicTransport handshake in recent history. >> >> >>> For 4 and 5, I'm worried about flow control >>> . tl;dr a >>> Http3Transport session could easily exhaust flow control limits for the >>> entire connection. This seems especially negative if pooling is performed >>> transparently (ex. a Http3Transport session may silently break HTTP/3 or >>> other sessions). >>> >> >> Unintentionally hitting the connection-level flow control limit is a >> serious implementation bug. I wouldn't expect this to still be a problem >> once implementations mature. I wouldn't want to base our protocol choices >> based on a bug in non-production-ready implementations. >> >> >>> On Mon, Nov 16, 2020 at 5:10 PM David Schinazi >>> wrote: >>> >>>> I'd like us to take a step back, I think we're conflating many >>>> different topics here, and it's making it impossible to reason about this >>>> (at least for someone running on not enough sleep like I am this week). >>>> >>>> Topic 1: the complexity of implementing Http3Transport as opposed to >>>> QuicTransport on the client >>>> From my perspective, all browsers interested in WebTransport are >>>> implementing HTTP/3, so I don't see much complexity there. >>>> Please reply here if you know of complexities I'm not seeing >>>> >>>> Topic 2: the complexity of implementing Http3Transport as opposed to >>>> QuicTransport on the server >>>> As far as I know, most server-side QUIC stacks also support HTTP/3, >>>> and for QuicTransport they already have DATAGRAM support so I think the >>>> delta is negligible. >>>> Please reply here if you know of complexities I'm not seeing >>>> >>>> Topic 3: the benefits of pooling WebTransport >>>> This allows saving round trips to get WebTransport up and running >>>> This allows sharing congestion control state >>>> This allows letting the QUIC implementation prioritize DATAGRAMs vs >>>> HTTP requests instead of relying on the kernel or routers which have less >>>> information >>>> Overall, I think pooling is beneficial (though not an absolute >>>> must-have) >>>> Please reply here if you know of benefits I'm not seeing >>>> >>>> Topic 4: the difficulty of pooling Http3Transport on the client >>>> It appears that all browsers that are interested in WebTransport >>>> are implementing pooling in their HTTP/3 stack so additionally pooling >>>> WebTransport should not introduce more complexity >>>> Please reply here if you know of complexities I'm not seeing >>>> >>>> Topic 5: the difficulty of pooling Http3Transport on the server >>>> This one is trickier. If you have frontends that know how to route >>>> HTTP requests to backends, DATAGRAM support is going to be a whole new >>>> world. >>>> However, and I think this is really important: implementing this on >>>> the server is OPTIONAL. >>>> The server can easily use a different hostname (and different TLS >>>> certificates) for HTTP vs WebTransport and clients will not pool the two >>>> together. >>>> Once you use different domain names per WebTransport object, >>>> Http3Transport has the exact same pooling properties as QuicTransport. >>>> Please reply here if you know of complexities I'm not seeing >>>> >>>> What am I missing? >>>> >>>> Thanks, >>>> David >>>> >>>> >>>> On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: >>>> >>>>> I'm *very* concerned about any functionality that *requires* >>>>> pooling. Pooling is a client-specific optimization and pooling policy is >>>>> subject to change(within reason) at any time. If applications are saying >>>>> "it'd be cool if we could share congestion control and loss recovery state >>>>> between H3 and WebTransport most of the time", then I can see there being >>>>> real(albeit small) benefits, just like there would be for putting >>>>> DataChannels and RTP into one QUIC connection for WebRTC. If people are >>>>> intending to rely on pooling so an HTTP(hopefully H3) request can trigger a >>>>> WebTransport response, I think we're in a world of pain and >>>>> over-optimization. >>>>> >>>>> This is more obvious in light of the fact that a WebTransport >>>>> endpoint is likely not a generic CDN endpoint, as has been clearly stated >>>>> by Mark Nottingham. >>>>> >>>>> Bernard's comments above point to a tighter coupling between HTTP/3 >>>>> and WebTransport than I think is practical in production, unless I >>>>> misunderstood(which I may have, it's been a long day). >>>>> >>>>> All of this makes me think we should punt the HTTP based WebTransport >>>>> options down the road a year or so and focus on QuicTransport initially. >>>>> It's not to say we won't do them, but they're clearly more complex >>>>> than QuicTransport and it'd be good to have real deployment experience >>>>> prior to starting so we know what the requirements are and where the >>>>> dragons are lurking. Also, the W3C should design APIs that make it easy to >>>>> detect failure to establish a QUIC-based WebTransport, and this ensures >>>>> those are well exercised. Maybe we DO require pooling under certain >>>>> conditions and describe those, but there are likely privacy concerns under >>>>> some circumstances and I'm not enough of an expert to know what would be >>>>> acceptable to all clients. >>>>> >>>>> Some people in the WG may think we have to release a TCP based >>>>> WebTransport at the same time as a QUIC based one, but I don't think that's >>>>> true and even if we standardized them at the same time, it doesn't mean >>>>> both will achieve wide deployment at the same time. As I said at the mic, >>>>> I don't see any reason YouTube would deploy a TCP based WebTransport given >>>>> it will have to maintain an HTTP/1.1 option for basically forever and >>>>> they've spent a good bit of effort to make sure that works as well as it >>>>> can. It's clear to me there are compelling use cases right now for >>>>> QuicTransport, but the driving use cases for the fallback are not clear to >>>>> me. Consistency is intellectually appealing, but doesn't drive deployments. >>>>> >>>>> Ian >>>>> >>>>> On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba >>>>> wrote: >>>>> >>>>>> David said: >>>>>> >>>>>> "Where does this come from? A lot of QUIC servers are implementing >>>>>> QUIC datagrams, and once you have those the delta with h3 datagrams is >>>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>>> who haven't tried to implement it? If that's the case, then we should get >>>>>> some implementation experience to confirm or debunk that theory." >>>>>> >>>>>> [BA] The pooling use cases often involve an interaction between an >>>>>> HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn't >>>>>> just elicit an HTTP/3 Response. It also causes something else to happen, >>>>>> something that isn't specified in the HTTP/3 protocol, such as eliciting a >>>>>> datagram flow or bi/unidirectional stream from the server. This is what is >>>>>> contemplated in several of the "Live Event" use cases, where the HTTP/3 >>>>>> Request/Response would be requesting the desired Event. The major advantage >>>>>> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >>>>>> stalls. So developers understand the value that support for datagrams and >>>>>> server-initiated streams can provide - the question is whether they'll have >>>>>> all the interoperable pieces in place to deploy it. >>>>>> >>>>>> Just because a generic HTTP/3 server supports QUIC and WebTransport, >>>>>> doesn't mean that it will support these use cases. I've been asked whether >>>>>> better interoperability and wider ecosystem support could be achieved by >>>>>> extending HTTP/3 in a way more in keeping with the existing protocol design >>>>>> - such as by allowing an HTTP/3 Request to specify a resource to be >>>>>> returned in a flow of datagrams. >>>>>> >>>>>> The situation might be more tenable if the node.js framework had >>>>>> HTTP/3 and QUIC modules on the horizon. >>>>>> >>>>>> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi < >>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba < >>>>>>> bernard.aboba@gmail.com> wrote: >>>>>>> >>>>>>>> Luke said: >>>>>>>> >>>>>>>> "My primary concern is that Http3Transport requires non-generic >>>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>>> HTTP/3 implementation that does support it." >>>>>>>> >>>>>>>> [BA] I have also heard this concern from developers. The concerns >>>>>>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>>>>>> WebTransport. This does enable some interesting use cases, such as a >>>>>>>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>>>>>>> or initiating bi-directional or uni-directional streams. So there is >>>>>>>> perceived value, but the question is whether that value will be widely >>>>>>>> supported across the HTTP/3 ecosystem. >>>>>>>> >>>>>>>> At this point, most generic HTTP/3 servers are not expected to >>>>>>>> support HTTP/3 datagrams (not part of the HTTP/3 protocol) or >>>>>>>> Http3Transport (perceived as a niche protocol), so that pooling would only >>>>>>>> be possible when using a framework. node.js will not have QUIC support for >>>>>>>> 12-18 months (held up by OpenSSL) so even framework support is expected to >>>>>>>> be limited. >>>>>>>> >>>>>>> >>>>>>> Where does this come from? A lot of QUIC servers are implementing >>>>>>> QUIC datagrams, and once you have those the delta with h3 datagrams is >>>>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>>>> who haven't tried to implement it? If that's the case, then we should get >>>>>>> some implementation experience to confirm or debunk that theory. >>>>>>> >>>>>>> >>>>>>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>>>>>> leveraged for QuicTransport in the form of the header parsing. I think >>>>>>>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>>>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>>>>>> >>>>>>>>>> My primary concern is that Http3Transport requires non-generic >>>>>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>>>>> HTTP/3 implementation that does support it. >>>>>>>>>> >>>>>>>>> >>>>>>>>> Hi Luke, >>>>>>>>> >>>>>>>>> I'm curious, could you elaborate on what these "non-generic >>>>>>>>> modifications to the HTTP/3 layer" are please? >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> David >>>>>>>>> >>>>>>>>> >>>>>>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>> >>>>>>>>>>> Hi Luke, >>>>>>>>>>> >>>>>>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really >>>>>>>>>>>> mean "QuicTransport has greater interoperability". You can take any QUIC >>>>>>>>>>>> implementation (+ datagram extension) and add a thin layer to support >>>>>>>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Thanks for the clarification. I appreciate the sentiment. But >>>>>>>>>>> given the development of QUIC its kind of surprising that people would find >>>>>>>>>>> it easier to identify an implementation that supports QUIC and datagram but >>>>>>>>>>> does not support HTTP/3. >>>>>>>>>>> >>>>>>>>>>> Thr situation for a more clean-room implementation is different, >>>>>>>>>>> I agree. However, by the time you've done all the hard stuff with QUIC, a >>>>>>>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>>>>>>>>> compression, server push and extensibility points. >>>>>>>>>>> >>>>>>>>>>> I also see the current design being the thin end of the wedge. >>>>>>>>>>> The proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>>>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>>>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>>>>>>> years of effort. >>>>>>>>>>> >>>>>>>>>>> Cheers >>>>>>>>>>> Lucas >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> Hi folks, >>>>>>>>>>>>> >>>>>>>>>>>>> To follow up on one thread of discussion during IETF 109. To >>>>>>>>>>>>> over simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>>>>>> >>>>>>>>>>>>> I'd like to push more on this, what is the measurable >>>>>>>>>>>>> complexity of HTTP/3 over QUIC plus a new application mapping that needs to >>>>>>>>>>>>> be defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>>>>>> >>>>>>>>>>>>> Victor mentioned his proposal for a unified header semantic >>>>>>>>>>>>> across all transports, this is >>>>>>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>>>>>> cross-protocol pooling? >>>>>>>>>>>>> >>>>>>>>>>>>> Cheers, >>>>>>>>>>>>> Lucas >>>>>>>>>>>>> -- >>>>>>>>>>>>> Webtransport mailing list >>>>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>>>> >>>>>>>>>>>> -- >>>>>>>>>> Webtransport mailing list >>>>>>>>>> Webtransport@ietf.org >>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>> >>>>>>>>> -- >>>>>>>>> Webtransport mailing list >>>>>>>>> Webtransport@ietf.org >>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>> >>>>>>>> -- >>>>>> Webtransport mailing list >>>>>> Webtransport@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>> >>>>> --000000000000877db105b4489cc3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

    On Mon, Nov 16, 2020 at 11:35 PM Luke Cur= ley <kixelated@gmail.com> = wrote:
    Hey David, I gave a quick presentation on my use-case yesterday. W= e're using HLS so=C2=A0all media delivery is currently HTTP-based and w= e would love to use HTTP/3.=C2=A0

    And= it was a great presentation! Your use case makes sense to me.
    = =C2=A0
    However, reducing latency requires a tighter feedback loop and som= e form of push. The HTTP request/response model just complicates things,=C2= =A0especially when HTTP push is brought into the equation. QuicTransport is= much simpler and allows us to build something closer to RTMP on top.
    =

    I don't understand this, can you= clarify? What does the HTTP request/response model have to do with the Htt= p3Transport vs QuicTransport question?
    =C2=A0
    It also means= that we can use the same protocol for both distribution and contribution.<= /div>

    I apologize, but I d= on't understand this either. What same protocol?

    =
    On Mon, Nov 16, 2020 at 9:29 PM David= Schinazi <dschinazi.ietf@gmail.com> wrote:


    On Mon, Nov = 16, 2020 at 6:02 PM Luke Curley <kixelated@gmail.com> wrote:
    I think that's a = good starting summary David. Some things worth mentioning:

    For 1 and 4, Twitch is using QuicTransport for both native applications = (ex. mobile, desktop, devices) and web applications. It's minor, but we= benefit from the ability to use any QUIC library (technically we don't= implement datagrams...) instead only those with HTTP/3 and Http3Transport = support. I think this context was missing in the previous discussions.

    Can you clarify which implementatio= ns you were considering that support QUIC+DATAGRAM but not HTTP/3?
    =C2=A0
    For 3, QuicTransport can support 0-RTT if we declare the pa= th/origin handshake to be=C2=A0idempotent... unless the new connection = is routed to a different host. Both pooled Http3Transport and a new QuicTra= nsport connection could take the same number of round trips.

    0-RTT state isn't saved across ALPNs, eve= n if it's to the same host. So Http3Transport=C2=A0would get inline 0-R= TT but QuicTransport would not get 0-RTT unless you've already performe= d a QuicTransport handshake in recent history.
    =C2=A0
    For 4 and= 5, I'm worried about flow control. tl;dr a Http3Transport ses= sion could easily exhaust flow control limits for the entire connection. Th= is seems especially negative if pooling is performed transparently (ex. a H= ttp3Transport session may silently break HTTP/3 or other sessions).

    Unintentionally hitting the connection= -level=C2=A0flow control limit is a serious implementation bug. I wouldn= 9;t expect this to still be a problem once implementations mature. I wouldn= 't want to base our protocol choices based on a bug in non-production-r= eady implementations.
    =C2=A0
    On Mon, Nov 16, 2020 at 5:10 PM David Schinazi <dschinazi.ietf@gmail.com= > wrote:
    I'd like us to take a step back, I think we're conflat= ing many different topics here, and it's making it impossible to reason= about this (at least for someone running on not enough sleep like I am thi= s week).

    Topic 1: the complexity of implementing=C2=A0Ht= tp3Transport=C2=A0as opposed to QuicTransport=C2=A0on the client
    = =C2=A0 =C2=A0 From my perspective, all browsers interested in WebTransport = are implementing HTTP/3, so I don't see much complexity there.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm not s= eeing

    Topic 2: the complexity of implementing= =C2=A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the server
    =C2=A0 =C2=A0 As far as I know, most server-side QUIC stacks = also support HTTP/3, and for QuicTransport=C2=A0they already have DATAGRAM = support so I think the delta is negligible.
    =C2=A0 =C2=A0 Please = reply here if you know of complexities I'm not seeing
    <= div>
    Topic 3: the benefits of pooling WebTransport
    = =C2=A0 =C2=A0 This allows saving round trips to get WebTransport up and run= ning
    =C2=A0 =C2=A0 This allows sharing congestion control state
    =C2=A0 =C2=A0 This allows letting the QUIC implementation prioriti= ze DATAGRAMs vs HTTP requests instead of relying on the kernel or routers w= hich have less information
    =C2=A0 =C2=A0 Overall, I think pooling= is beneficial (though not an absolute must-have)
    =C2=A0 =C2=A0 P= lease reply here if you know of benefits I'm not seeing
    <= br>
    Topic 4: the difficulty of pooling Http3Transport=C2=A0on the= client
    =C2=A0 =C2=A0 It appears that all browsers that are inter= ested in WebTransport are implementing pooling in their HTTP/3 stack so add= itionally pooling WebTransport should not introduce more complexity
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm not = seeing

    Topic 5: the difficulty of = pooling Http3Transport=C2=A0on the server
    =C2=A0 =C2=A0 Thi= s one is trickier. If you have frontends that know how to route HTTP=C2=A0r= equests to backends, DATAGRAM support is going to be a whole new world.
    =C2=A0 =C2=A0 However, and I think this is really important: impleme= nting this on the server is OPTIONAL.
    =C2=A0 =C2=A0 The server ca= n easily use a different hostname (and different TLS certificates) for HTTP= vs WebTransport and clients will not pool the two together.
    =C2= =A0 =C2=A0 Once you use different domain names per WebTransport object, Htt= p3Transport=C2=A0has the exact same pooling properties as QuicTransport.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm= not seeing

    What am I missing?

    <= /div>
    Thanks,
    David


    On Mon, Nov 16, 2020= at 4:45 PM Ian Swett <ianswett@google.com> wrote:
    I'm very concerned a= bout any functionality that requires pooling.=C2=A0 Pooling is a cli= ent-specific optimization and pooling policy is subject to change(within re= ason) at any time.=C2=A0 If applications=C2=A0are saying "it'd be = cool if we could share congestion control and loss recovery state between H= 3 and WebTransport most of the time", then I can see there being real(= albeit small) benefits, just like there would be for putting DataChannels a= nd RTP into one QUIC connection for WebRTC.=C2=A0 If people are intending t= o rely on pooling so an HTTP(hopefully H3) request can trigger a WebTranspo= rt response, I think we're in a world of pain and over-optimization.
    This is more obvious in light of the fact that a WebTransp= ort endpoint=C2=A0is likely not a generic CDN endpoint, as has been clearly= stated by Mark Nottingham.

    Bernard's comments a= bove point to a tighter coupling between HTTP/3 and WebTransport than I thi= nk is practical in production, unless I misunderstood(which I may have, it&= #39;s been a long day).

    All of this makes me think= we should punt the HTTP based WebTransport options down the road a year or= so and focus on QuicTransport=C2=A0initially.=C2=A0 It's not to say we= won't do them, but they're clearly more complex than=C2=A0QuicTran= sport=C2=A0and it'd be good to have real deployment experience prior to= starting so we know what the requirements are and where the dragons are lu= rking.=C2=A0 Also, the W3C should design APIs that make it easy to detect f= ailure to establish a QUIC-based=C2=A0WebTransport, and this ensures those = are well exercised.=C2=A0 Maybe we DO require pooling under certain conditi= ons and describe those, but there are likely privacy concerns under some ci= rcumstances and I'm not enough of an expert to know what would be accep= table to all clients.

    Some=C2=A0people in the WG m= ay think we have to release a TCP based WebTransport at the same time as a = QUIC based one, but I don't think that's true and even if we standa= rdized them at the same time, it doesn't mean both will achieve wide de= ployment at the same time.=C2=A0 As I said at the mic, I don't see any = reason YouTube would deploy a TCP based WebTransport given it will have to = maintain an HTTP/1.1 option for basically forever and they've spent a g= ood bit of effort to make sure that works as well as it can.=C2=A0 It's= clear to me there are compelling use cases right now for QuicTransport, bu= t=C2=A0the driving use cases for the fallback are not clear to me.=C2=A0 Co= nsistency is intellectually appealing, but doesn't drive deployments.

    Ian

    On Mon, Nov 16, 2020 at 6:36 PM Bern= ard Aboba <= bernard.aboba@gmail.com> wrote:
    D= avid said:=C2=A0

    "Where does this come from? A lot = of QUIC servers are implementing QUIC datagrams, and once you have those th= e delta with h3 datagrams is negligible. Additionally, multiple h3 server i= mplementers=C2=A0have indicated they want to support WebTransport. It's= starting to feel like the pushback on HTTP3Transport=C2=A0is purely based = on a perception of complexity from folks who haven't tried to implement= it? If that's the case, then we should get some implementation experie= nce to confirm or debunk that theory."

    [BA] T= he pooling use cases often involve an interaction between an HTTP/3 request= /response and WebTransport.=C2=A0 so the HTTP/3 Request doesn't just el= icit an HTTP/3 Response.=C2=A0 It also causes something else to happen, som= ething that isn't specified in the HTTP/3 protocol, such as eliciting a= datagram flow or bi/unidirectional stream from the server.=C2=A0 This is w= hat is contemplated in several of the "Live Event" use cases, whe= re the HTTP/3 Request/Response would be requesting the desired Event. The m= ajor advantage over HLS is avoiding Head-of-Line blocking, reducing video f= reezes and stalls.=C2=A0 So developers understand the value that support fo= r datagrams and server-initiated streams can provide - the question is whet= her they'll have all the interoperable pieces in place to deploy it.=C2= =A0

    Just because a generic HTTP/3 server supports= QUIC and WebTransport, doesn't mean that it will support these use cas= es.=C2=A0 I've been asked whether better interoperability and wider eco= system support could be achieved by extending HTTP/3 in a way more in keepi= ng with the existing protocol design - such as by allowing an HTTP/3 Reques= t to specify a resource to be returned in a flow of datagrams.=C2=A0
    <= div>
    The situation might be more tenable if the node.js frame= work had HTTP/3 and QUIC modules on the horizon.

    On Mo= n, Nov 16, 2020 at 1:00 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:
    <= div dir=3D"ltr">

    On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba <bernard.aboba@gmai= l.com> wrote:
    Luke said:=C2=A0

    "My primary concern is that Http3Transport requires = non-generic modifications to the HTTP/3 layer mostly to support connection = pooling. I'm worried that this will limit support for Http3Transport an= d complicates any HTTP/3 implementation that does support it."<= /div>

    [BA] I have also heard this concern from developer= s. The concerns primarily arise from the pooling of HTTP/3 Request/Response= s with WebTransport. This does enable some interesting use cases, such as a= Request/Response (e.g. gRPC) that can result in a server sending datagrams= or initiating bi-directional or uni-directional streams.=C2=A0 So there is= perceived value, but the question is whether that value will be widely sup= ported across the HTTP/3 ecosystem.=C2=A0

    At this = point, most generic HTTP/3 servers are not expected to support HTTP/3 datag= rams (not part of the HTTP/3 protocol) or Http3Transport (perceived as a ni= che protocol), so that pooling would only be possible when using a framewor= k.=C2=A0 node.js will not have=C2=A0QUIC support for 12-18 months (held up = by OpenSSL) so even framework support is expected to be limited.

    Where does this come from? A lot of QUIC = servers are implementing QUIC datagrams, and once you have those the delta = with h3 datagrams is negligible. Additionally, multiple h3 server implement= ers=C2=A0have indicated they want to support WebTransport. It's startin= g to feel like the pushback on HTTP3Transport=C2=A0is purely based on a per= ception of complexity from folks who haven't tried to implement it? If = that's the case, then we should get some implementation experience to c= onfirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David Schinazi <dschinazi.ietf@gmai= l.com> wrote:


    On Mon, Nov 16, 2020 at 11:34 AM= Luke Curley <k= ixelated@gmail.com> wrote:
    We're on the same page that there= 9;s code in HTTP/3 that could be leveraged for QuicTransport in the form of= the header parsing. I think there's a path to merge QuicTransport and = Http3Transport by leveraging HTTP/3 for the handshake and QUIC for stream d= elivery.

    My primary concern is that Http3Transport requi= res non-generic modifications to the HTTP/3 layer mostly to support connect= ion pooling. I'm worried that this will limit support for Http3Transpor= t and complicates any HTTP/3 implementation that does support it.

    Hi Luke,

    I'= m curious, could you elaborate on what these "non-generic modification= s to the HTTP/3 layer" are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com> w= rote:
    Hi Luke,

    On Mon, 16 Nov 2020, = 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clarify, when I say &= quot;QuicTransport is simpler" I really mean "QuicTransport has g= reater interoperability". You can take any QUIC implementation (+ data= gram extension) and add a thin layer to support QuicTransport. It's a n= ice layering of protocols and it's something that I want to see in gene= ral as QUIC replaces TCP.

    Thanks for the clarification. I appreciate= the sentiment. But given the development of QUIC its kind of surprising th= at people would find it easier to identify an implementation that supports = QUIC and datagram but does not support HTTP/3.

    <= /div>
    Thr situation for a more clean-room implementation i= s different, I agree. However, by the time you've done all the hard stu= ff with QUIC, a very focused HTTP/3 layer ends up quite thin too. You can i= gnore dynamic compression, server push and extensibility points.

    I also see the current design bein= g the thin end of the wedge. The proposal I linked talks about HTTP-like he= ader parsing. So its "just" a thin layer to do some parsing. Then= folks will probably want some want to tweak parameter, acontrol channel, a= way to do graceful close, a sprinkle of GREASE. To extrapolate forward, wh= at would be the delta be between some final product QuicTransport and HTTP/= 3. Too small a delta and we've wasted years of effort.

    Cheers
    Lucas


    =

    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <lucaspard= ue.24.7@gmail.com> wrote:
    Hi folks,

    T= o follow up on one thread of discussion during IETF 109. To over simplify w= hat we've heard a few folks say, they prefer QuicTransport because it s= impler and they don't need pooling.

    I'd li= ke to push more on this, what is the measurable complexity of HTTP/3 over Q= UIC plus a new application mapping that needs to be defined? Let's isol= ate pooling as a variable and ignore it.

    Victor me= ntioned his proposal for a unified header semantic across all transports, t= his is https://github.c= om/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. Taking a= closer look at it, I have some concerns that I added as comments. HTTP ha= s semantics for a reason. If QuicTransport is going to start borrowing HTTP= piecemeal, I really wonder how simple people might feel it is. I think it&= #39;s important to avoid something that looks like HTTP but behaves differe= ntly. Is it really much of a stretch to just do HTTP/3 but give it a differ= ent ALPN so that we avoid problems related to cross-protocol pooling?
    =

    Cheers,
    Lucas
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    --000000000000877db105b4489cc3-- From nobody Tue Nov 17 00:39:55 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 984403A0985 for ; Tue, 17 Nov 2020 00:39:54 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JTtaFufCYH-g for ; Tue, 17 Nov 2020 00:39:51 -0800 (PST) Received: from mail-oo1-xc29.google.com (mail-oo1-xc29.google.com [IPv6:2607:f8b0:4864:20::c29]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id E12073A0982 for ; Tue, 17 Nov 2020 00:39:50 -0800 (PST) Received: by mail-oo1-xc29.google.com with SMTP id q28so4564879oof.1 for ; Tue, 17 Nov 2020 00:39:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Fwv37+QubMaCUucH0N5JZo9Ov2g7fA/euZvz337PHNs=; b=KxQTLCsbN4zFvEnhUjPTtah75suefvtimkdvyW4YlnloKCKqSoSAJVLi3eDAWTOFqW OwpvWJWYF+GXcievz1cLPYD1/RpC7XAt4Upz3jJPSgVakHhOXgL2EbkRs9foxTHJ0fdt svPWjnzGaYrjoXuRvVzwd6i1ZL7mcRX3PjPqHFpjUj7WNYEHU6blZKg3OVi+3CJMietJ jsD7zwgG5uRP/6Zpc8TCSQvxZZfaJGzXB8xobxHh9Hja/DVQckRUZTDgBBXL6gEiErVI 6jhNfhjdf/V6QX8v2X9auohBhVrunmIpeW71kV68eh4gTI2Rqm8vTTjI0oAFmFmHEp1z ETHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Fwv37+QubMaCUucH0N5JZo9Ov2g7fA/euZvz337PHNs=; b=s9+pVGilxtK4lawv9lBM/3rTshv+CbuPD/dIwi0SBe5tV0cQ7JLQWW1WjQPrl3wW4H tk0Vvx4CD3IqD0iP2xyr2Kp1n9U4ERHkencDuMtHkGQpOkPkNR6KY/w013O+lIx2fT4l ETq+c7NTpvemQAP5Nh3mDYF1gSYXST919tA0x7LABVQXR6Qw0czp7gq5AStH+of4MQqG CgIz6Fq1bkQAZO86EOVoxrk6MA46ly7YFs10GhHTWpnRDK3gYEFv4BYhtoSA8ZWRciVK LvDkeYpalUl6kWJP9ePfF6mSFhpk3H3YiWmqWt1dN86kufD3s2JHffD0MMir2Asc5zJN mKcA== X-Gm-Message-State: AOAM533QomQphcRswGG+hYd0n9cY0jzr2N4UbI5pHiuoY6H2C5dM+Bx+ RrqA9MuE1tvXaNgpLYHxtjD6SmZ9MfGzgyZrQI0= X-Google-Smtp-Source: ABdhPJwUxYOGOUa7W7u8RjkIP0QYcwewpzUKKPKBUPnEcsR/pxxWYwHkEUMdSGE4ilTl6UXnL6FnsqCVjEUR5IlTt0Y= X-Received: by 2002:a4a:d043:: with SMTP id x3mr2295054oor.19.1605602389832; Tue, 17 Nov 2020 00:39:49 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Luke Curley Date: Tue, 17 Nov 2020 00:39:39 -0800 Message-ID: To: David Schinazi Cc: Ian Swett , Bernard Aboba , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="00000000000018bc6f05b44970b5" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 08:39:55 -0000 --00000000000018bc6f05b44970b5 Content-Type: text/plain; charset="UTF-8" Sorry, I didn't correctly understand your question until after I hit send... I thought you were asking about HTTP/3 versus QuicTransport. QuicTransport can be supported at the application layer for an arbitrary* QUIC library. For example, a kernel or hardware device could expose an accelerated QUIC API (...we care a lot about performance). The simple QuicTransport handshake would be done in user-space. Http3Transport, on the other hand, requires explicit support in an HTTP/3 library. While it's not difficult to implement, explicit Http3Transport support will be more limited than generic QUIC support. Native clients will have fewer and potentially worse implementations to choose from. Again, I feel like this is only a minor benefit for QuicTransport. I'm brand new to the IETF process and I may be overvaluing certain properties. * Datagrams are currently required for QuicTransport, although it's a very generic extension and could even be optional. On Mon, Nov 16, 2020 at 11:40 PM David Schinazi wrote: > > On Mon, Nov 16, 2020 at 11:35 PM Luke Curley wrote: > >> Hey David, I gave a quick presentation on my use-case yesterday. We're >> using HLS so all media delivery is currently HTTP-based and we would love >> to use HTTP/3. >> > > And it was a great presentation! Your use case makes sense to me. > > >> However, reducing latency requires a tighter feedback loop and some form >> of push. The HTTP request/response model just complicates >> things, especially when HTTP push is brought into the equation. >> QuicTransport is much simpler and allows us to build something closer to >> RTMP on top. >> > > I don't understand this, can you clarify? What does the HTTP > request/response model have to do with the Http3Transport vs QuicTransport > question? > > >> It also means that we can use the same protocol for both distribution and >> contribution. >> > > I apologize, but I don't understand this either. What same protocol? > > On Mon, Nov 16, 2020 at 9:29 PM David Schinazi >> wrote: >> >>> >>> >>> On Mon, Nov 16, 2020 at 6:02 PM Luke Curley wrote: >>> >>>> I think that's a good starting summary David. Some things worth >>>> mentioning: >>>> >>>> For 1 and 4, Twitch is using QuicTransport for both native applications >>>> (ex. mobile, desktop, devices) and web applications. It's minor, but we >>>> benefit from the ability to use any QUIC library (technically we don't >>>> implement datagrams...) instead only those with HTTP/3 and Http3Transport >>>> support. I think this context was missing in the previous discussions. >>>> >>> >>> Can you clarify which implementations you were considering that support >>> QUIC+DATAGRAM but not HTTP/3? >>> >>> >>>> For 3, QuicTransport can support 0-RTT if we declare the path/origin >>>> handshake to be idempotent >>>> ... unless the new >>>> connection is routed to a different host. Both pooled Http3Transport and a >>>> new QuicTransport connection could take the same number of round trips. >>>> >>> >>> 0-RTT state isn't saved across ALPNs, even if it's to the same host. So >>> Http3Transport would get inline 0-RTT but QuicTransport would not get 0-RTT >>> unless you've already performed a QuicTransport handshake in recent history. >>> >>> >>>> For 4 and 5, I'm worried about flow control >>>> . tl;dr a >>>> Http3Transport session could easily exhaust flow control limits for the >>>> entire connection. This seems especially negative if pooling is performed >>>> transparently (ex. a Http3Transport session may silently break HTTP/3 or >>>> other sessions). >>>> >>> >>> Unintentionally hitting the connection-level flow control limit is a >>> serious implementation bug. I wouldn't expect this to still be a problem >>> once implementations mature. I wouldn't want to base our protocol choices >>> based on a bug in non-production-ready implementations. >>> >>> >>>> On Mon, Nov 16, 2020 at 5:10 PM David Schinazi < >>>> dschinazi.ietf@gmail.com> wrote: >>>> >>>>> I'd like us to take a step back, I think we're conflating many >>>>> different topics here, and it's making it impossible to reason about this >>>>> (at least for someone running on not enough sleep like I am this week). >>>>> >>>>> Topic 1: the complexity of implementing Http3Transport as opposed to >>>>> QuicTransport on the client >>>>> From my perspective, all browsers interested in WebTransport are >>>>> implementing HTTP/3, so I don't see much complexity there. >>>>> Please reply here if you know of complexities I'm not seeing >>>>> >>>>> Topic 2: the complexity of implementing Http3Transport as opposed to >>>>> QuicTransport on the server >>>>> As far as I know, most server-side QUIC stacks also support >>>>> HTTP/3, and for QuicTransport they already have DATAGRAM support so I think >>>>> the delta is negligible. >>>>> Please reply here if you know of complexities I'm not seeing >>>>> >>>>> Topic 3: the benefits of pooling WebTransport >>>>> This allows saving round trips to get WebTransport up and running >>>>> This allows sharing congestion control state >>>>> This allows letting the QUIC implementation prioritize DATAGRAMs >>>>> vs HTTP requests instead of relying on the kernel or routers which have >>>>> less information >>>>> Overall, I think pooling is beneficial (though not an absolute >>>>> must-have) >>>>> Please reply here if you know of benefits I'm not seeing >>>>> >>>>> Topic 4: the difficulty of pooling Http3Transport on the client >>>>> It appears that all browsers that are interested in WebTransport >>>>> are implementing pooling in their HTTP/3 stack so additionally pooling >>>>> WebTransport should not introduce more complexity >>>>> Please reply here if you know of complexities I'm not seeing >>>>> >>>>> Topic 5: the difficulty of pooling Http3Transport on the server >>>>> This one is trickier. If you have frontends that know how to route >>>>> HTTP requests to backends, DATAGRAM support is going to be a whole new >>>>> world. >>>>> However, and I think this is really important: implementing this >>>>> on the server is OPTIONAL. >>>>> The server can easily use a different hostname (and different TLS >>>>> certificates) for HTTP vs WebTransport and clients will not pool the two >>>>> together. >>>>> Once you use different domain names per WebTransport object, >>>>> Http3Transport has the exact same pooling properties as QuicTransport. >>>>> Please reply here if you know of complexities I'm not seeing >>>>> >>>>> What am I missing? >>>>> >>>>> Thanks, >>>>> David >>>>> >>>>> >>>>> On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: >>>>> >>>>>> I'm *very* concerned about any functionality that *requires* >>>>>> pooling. Pooling is a client-specific optimization and pooling policy is >>>>>> subject to change(within reason) at any time. If applications are saying >>>>>> "it'd be cool if we could share congestion control and loss recovery state >>>>>> between H3 and WebTransport most of the time", then I can see there being >>>>>> real(albeit small) benefits, just like there would be for putting >>>>>> DataChannels and RTP into one QUIC connection for WebRTC. If people are >>>>>> intending to rely on pooling so an HTTP(hopefully H3) request can trigger a >>>>>> WebTransport response, I think we're in a world of pain and >>>>>> over-optimization. >>>>>> >>>>>> This is more obvious in light of the fact that a WebTransport >>>>>> endpoint is likely not a generic CDN endpoint, as has been clearly stated >>>>>> by Mark Nottingham. >>>>>> >>>>>> Bernard's comments above point to a tighter coupling between HTTP/3 >>>>>> and WebTransport than I think is practical in production, unless I >>>>>> misunderstood(which I may have, it's been a long day). >>>>>> >>>>>> All of this makes me think we should punt the HTTP based WebTransport >>>>>> options down the road a year or so and focus on QuicTransport initially. >>>>>> It's not to say we won't do them, but they're clearly more complex >>>>>> than QuicTransport and it'd be good to have real deployment experience >>>>>> prior to starting so we know what the requirements are and where the >>>>>> dragons are lurking. Also, the W3C should design APIs that make it easy to >>>>>> detect failure to establish a QUIC-based WebTransport, and this ensures >>>>>> those are well exercised. Maybe we DO require pooling under certain >>>>>> conditions and describe those, but there are likely privacy concerns under >>>>>> some circumstances and I'm not enough of an expert to know what would be >>>>>> acceptable to all clients. >>>>>> >>>>>> Some people in the WG may think we have to release a TCP based >>>>>> WebTransport at the same time as a QUIC based one, but I don't think that's >>>>>> true and even if we standardized them at the same time, it doesn't mean >>>>>> both will achieve wide deployment at the same time. As I said at the mic, >>>>>> I don't see any reason YouTube would deploy a TCP based WebTransport given >>>>>> it will have to maintain an HTTP/1.1 option for basically forever and >>>>>> they've spent a good bit of effort to make sure that works as well as it >>>>>> can. It's clear to me there are compelling use cases right now for >>>>>> QuicTransport, but the driving use cases for the fallback are not clear to >>>>>> me. Consistency is intellectually appealing, but doesn't drive deployments. >>>>>> >>>>>> Ian >>>>>> >>>>>> On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba < >>>>>> bernard.aboba@gmail.com> wrote: >>>>>> >>>>>>> David said: >>>>>>> >>>>>>> "Where does this come from? A lot of QUIC servers are implementing >>>>>>> QUIC datagrams, and once you have those the delta with h3 datagrams is >>>>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>>>> who haven't tried to implement it? If that's the case, then we should get >>>>>>> some implementation experience to confirm or debunk that theory." >>>>>>> >>>>>>> [BA] The pooling use cases often involve an interaction between an >>>>>>> HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn't >>>>>>> just elicit an HTTP/3 Response. It also causes something else to happen, >>>>>>> something that isn't specified in the HTTP/3 protocol, such as eliciting a >>>>>>> datagram flow or bi/unidirectional stream from the server. This is what is >>>>>>> contemplated in several of the "Live Event" use cases, where the HTTP/3 >>>>>>> Request/Response would be requesting the desired Event. The major advantage >>>>>>> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >>>>>>> stalls. So developers understand the value that support for datagrams and >>>>>>> server-initiated streams can provide - the question is whether they'll have >>>>>>> all the interoperable pieces in place to deploy it. >>>>>>> >>>>>>> Just because a generic HTTP/3 server supports QUIC and WebTransport, >>>>>>> doesn't mean that it will support these use cases. I've been asked whether >>>>>>> better interoperability and wider ecosystem support could be achieved by >>>>>>> extending HTTP/3 in a way more in keeping with the existing protocol design >>>>>>> - such as by allowing an HTTP/3 Request to specify a resource to be >>>>>>> returned in a flow of datagrams. >>>>>>> >>>>>>> The situation might be more tenable if the node.js framework had >>>>>>> HTTP/3 and QUIC modules on the horizon. >>>>>>> >>>>>>> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi < >>>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba < >>>>>>>> bernard.aboba@gmail.com> wrote: >>>>>>>> >>>>>>>>> Luke said: >>>>>>>>> >>>>>>>>> "My primary concern is that Http3Transport requires non-generic >>>>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>>>> HTTP/3 implementation that does support it." >>>>>>>>> >>>>>>>>> [BA] I have also heard this concern from developers. The concerns >>>>>>>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>>>>>>> WebTransport. This does enable some interesting use cases, such as a >>>>>>>>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>>>>>>>> or initiating bi-directional or uni-directional streams. So there is >>>>>>>>> perceived value, but the question is whether that value will be widely >>>>>>>>> supported across the HTTP/3 ecosystem. >>>>>>>>> >>>>>>>>> At this point, most generic HTTP/3 servers are not expected to >>>>>>>>> support HTTP/3 datagrams (not part of the HTTP/3 protocol) or >>>>>>>>> Http3Transport (perceived as a niche protocol), so that pooling would only >>>>>>>>> be possible when using a framework. node.js will not have QUIC support for >>>>>>>>> 12-18 months (held up by OpenSSL) so even framework support is expected to >>>>>>>>> be limited. >>>>>>>>> >>>>>>>> >>>>>>>> Where does this come from? A lot of QUIC servers are implementing >>>>>>>> QUIC datagrams, and once you have those the delta with h3 datagrams is >>>>>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>>>>> who haven't tried to implement it? If that's the case, then we should get >>>>>>>> some implementation experience to confirm or debunk that theory. >>>>>>>> >>>>>>>> >>>>>>>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>>>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>>>>>>> wrote: >>>>>>>>>> >>>>>>>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>>>>>>> leveraged for QuicTransport in the form of the header parsing. I think >>>>>>>>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>>>>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>>>>>>> >>>>>>>>>>> My primary concern is that Http3Transport requires non-generic >>>>>>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>>>>>> HTTP/3 implementation that does support it. >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Hi Luke, >>>>>>>>>> >>>>>>>>>> I'm curious, could you elaborate on what these "non-generic >>>>>>>>>> modifications to the HTTP/3 layer" are please? >>>>>>>>>> >>>>>>>>>> Thanks, >>>>>>>>>> David >>>>>>>>>> >>>>>>>>>> >>>>>>>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>>> >>>>>>>>>>>> Hi Luke, >>>>>>>>>>>> >>>>>>>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, >>>>>>>>>>>> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I >>>>>>>>>>>>> really mean "QuicTransport has greater interoperability". You can take any >>>>>>>>>>>>> QUIC implementation (+ datagram extension) and add a thin layer to support >>>>>>>>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Thanks for the clarification. I appreciate the sentiment. But >>>>>>>>>>>> given the development of QUIC its kind of surprising that people would find >>>>>>>>>>>> it easier to identify an implementation that supports QUIC and datagram but >>>>>>>>>>>> does not support HTTP/3. >>>>>>>>>>>> >>>>>>>>>>>> Thr situation for a more clean-room implementation is >>>>>>>>>>>> different, I agree. However, by the time you've done all the hard stuff >>>>>>>>>>>> with QUIC, a very focused HTTP/3 layer ends up quite thin too. You can >>>>>>>>>>>> ignore dynamic compression, server push and extensibility points. >>>>>>>>>>>> >>>>>>>>>>>> I also see the current design being the thin end of the wedge. >>>>>>>>>>>> The proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>>>>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>>>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>>>>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>>>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>>>>>>>> years of effort. >>>>>>>>>>>> >>>>>>>>>>>> Cheers >>>>>>>>>>>> Lucas >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> Hi folks, >>>>>>>>>>>>>> >>>>>>>>>>>>>> To follow up on one thread of discussion during IETF 109. To >>>>>>>>>>>>>> over simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>>>>>>> >>>>>>>>>>>>>> I'd like to push more on this, what is the measurable >>>>>>>>>>>>>> complexity of HTTP/3 over QUIC plus a new application mapping that needs to >>>>>>>>>>>>>> be defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>>>>>>> >>>>>>>>>>>>>> Victor mentioned his proposal for a unified header semantic >>>>>>>>>>>>>> across all transports, this is >>>>>>>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>>>>>>> cross-protocol pooling? >>>>>>>>>>>>>> >>>>>>>>>>>>>> Cheers, >>>>>>>>>>>>>> Lucas >>>>>>>>>>>>>> -- >>>>>>>>>>>>>> Webtransport mailing list >>>>>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>>>>> >>>>>>>>>>>>> -- >>>>>>>>>>> Webtransport mailing list >>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>> >>>>>>>>>> -- >>>>>>>>>> Webtransport mailing list >>>>>>>>>> Webtransport@ietf.org >>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>> >>>>>>>>> -- >>>>>>> Webtransport mailing list >>>>>>> Webtransport@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>> >>>>>> --00000000000018bc6f05b44970b5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Sorry, I didn't correctly understand your question unt= il after I hit send... I thought you were asking about HTTP/3 versus QuicTr= ansport.

    QuicTransport can be supported at the applicati= on layer for an arbitrary* QUIC library. For example, a kernel or hardware = device could expose an accelerated=C2=A0QUIC API (...we care a lot about pe= rformance). The simple QuicTransport handshake would be done in user-space.=

    Http3Transport, on the other hand, requires expli= cit support in an HTTP/3 library. While it's not difficult to implement= , explicit Http3Transport support will be more limited than generic QUIC su= pport. Native clients will have fewer and potentially worse implementations= to choose from.

    Again, I feel like this is only a= minor benefit for QuicTransport. I'm brand new to the IETF process and= I may be overvaluing certain properties.


    * Datagrams are currently required for QuicTransport, although = it's a very generic extension and could even be optional.

    On Mon, Nov 16, 2020 at 11:40 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:

    On Mon, Nov 16, 2020 at 11:35 PM Luke Curley <kixelated@gmail.com> wro= te:
    Hey David, I gave a quick presentation on my use-case yesterday. We= 9;re using HLS so=C2=A0all media delivery is currently HTTP-based and we wo= uld love to use HTTP/3.=C2=A0

    And it = was a great presentation! Your use case makes sense to me.
    =C2=A0=
    However, reducing latency requires a tighter feedback loop and some form= of push. The HTTP request/response model just complicates things,=C2=A0esp= ecially when HTTP push is brought into the equation. QuicTransport is much = simpler and allows us to build something closer to RTMP on top.
    =

    I don't understand this, can you clari= fy? What does the HTTP request/response model have to do with the Http3Tran= sport vs QuicTransport question?
    =C2=A0
    It also means that = we can use the same protocol for both distribution and contribution.
    <= /div>

    I apologize, but I don'= ;t understand this either. What same protocol?

    On Mon, Nov 16, 2020 at 9:29 PM David Schin= azi <dschi= nazi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 20= 20 at 6:02 PM Luke Curley <kixelated@gmail.com> wrote:
    I think that's a good= starting summary David. Some things worth mentioning:

    F= or 1 and 4, Twitch is using QuicTransport for both native applications (ex.= mobile, desktop, devices) and web applications. It's minor, but we ben= efit from the ability to use any QUIC library (technically we don't imp= lement datagrams...) instead only those with HTTP/3 and Http3Transport supp= ort. I think this context was missing in the previous discussions.

    Can you clarify which implementations y= ou were considering that support QUIC+DATAGRAM but not HTTP/3?
    = =C2=A0
    For 3, QuicTransport can support 0-RTT if we declare the path= /origin handshake to be=C2=A0idempotent... unless the new connection is= routed to a different host. Both pooled Http3Transport and a new QuicTrans= port connection could take the same number of round trips.

    0-RTT state isn't saved across ALPNs, even = if it's to the same host. So Http3Transport=C2=A0would get inline 0-RTT= but QuicTransport would not get 0-RTT unless you've already performed = a QuicTransport handshake in recent history.
    =C2=A0
    For 4 and 5= , I'm worried about flow control. tl;dr a Http3Transport sessi= on could easily exhaust flow control limits for the entire connection. This= seems especially negative if pooling is performed transparently (ex. a Htt= p3Transport session may silently break HTTP/3 or other sessions).

    Unintentionally hitting the connection-l= evel=C2=A0flow control limit is a serious implementation bug. I wouldn'= t expect this to still be a problem once implementations mature. I wouldn&#= 39;t want to base our protocol choices based on a bug in non-production-rea= dy implementations.
    =C2=A0
    On Mon, Nov 16, 2020 at 5:10 PM David Schinazi <dschinazi.ietf@gmail.com&g= t; wrote:
    I'd like us to take a step back, I think we're conflatin= g many different topics here, and it's making it impossible to reason a= bout this (at least for someone running on not enough sleep like I am this = week).

    Topic 1: the complexity of implementing=C2=A0Http= 3Transport=C2=A0as opposed to QuicTransport=C2=A0on the client
    = =C2=A0 =C2=A0 From my perspective, all browsers interested in WebTransport = are implementing HTTP/3, so I don't see much complexity there.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm not s= eeing

    Topic 2: the complexity of implementing= =C2=A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the server
    =C2=A0 =C2=A0 As far as I know, most server-side QUIC stacks = also support HTTP/3, and for QuicTransport=C2=A0they already have DATAGRAM = support so I think the delta is negligible.
    =C2=A0 =C2=A0 Please = reply here if you know of complexities I'm not seeing
    <= div>
    Topic 3: the benefits of pooling WebTransport
    = =C2=A0 =C2=A0 This allows saving round trips to get WebTransport up and run= ning
    =C2=A0 =C2=A0 This allows sharing congestion control state
    =C2=A0 =C2=A0 This allows letting the QUIC implementation prioriti= ze DATAGRAMs vs HTTP requests instead of relying on the kernel or routers w= hich have less information
    =C2=A0 =C2=A0 Overall, I think pooling= is beneficial (though not an absolute must-have)
    =C2=A0 =C2=A0 P= lease reply here if you know of benefits I'm not seeing
    <= br>
    Topic 4: the difficulty of pooling Http3Transport=C2=A0on the= client
    =C2=A0 =C2=A0 It appears that all browsers that are inter= ested in WebTransport are implementing pooling in their HTTP/3 stack so add= itionally pooling WebTransport should not introduce more complexity
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm not = seeing

    Topic 5: the difficulty of = pooling Http3Transport=C2=A0on the server
    =C2=A0 =C2=A0 Thi= s one is trickier. If you have frontends that know how to route HTTP=C2=A0r= equests to backends, DATAGRAM support is going to be a whole new world.
    =C2=A0 =C2=A0 However, and I think this is really important: impleme= nting this on the server is OPTIONAL.
    =C2=A0 =C2=A0 The server ca= n easily use a different hostname (and different TLS certificates) for HTTP= vs WebTransport and clients will not pool the two together.
    =C2= =A0 =C2=A0 Once you use different domain names per WebTransport object, Htt= p3Transport=C2=A0has the exact same pooling properties as QuicTransport.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm= not seeing

    What am I missing?

    <= /div>
    Thanks,
    David


    On Mon, Nov 16, 2020= at 4:45 PM Ian Swett <ianswett@google.com> wrote:
    I'm very concerned a= bout any functionality that requires pooling.=C2=A0 Pooling is a cli= ent-specific optimization and pooling policy is subject to change(within re= ason) at any time.=C2=A0 If applications=C2=A0are saying "it'd be = cool if we could share congestion control and loss recovery state between H= 3 and WebTransport most of the time", then I can see there being real(= albeit small) benefits, just like there would be for putting DataChannels a= nd RTP into one QUIC connection for WebRTC.=C2=A0 If people are intending t= o rely on pooling so an HTTP(hopefully H3) request can trigger a WebTranspo= rt response, I think we're in a world of pain and over-optimization.
    This is more obvious in light of the fact that a WebTransp= ort endpoint=C2=A0is likely not a generic CDN endpoint, as has been clearly= stated by Mark Nottingham.

    Bernard's comments a= bove point to a tighter coupling between HTTP/3 and WebTransport than I thi= nk is practical in production, unless I misunderstood(which I may have, it&= #39;s been a long day).

    All of this makes me think= we should punt the HTTP based WebTransport options down the road a year or= so and focus on QuicTransport=C2=A0initially.=C2=A0 It's not to say we= won't do them, but they're clearly more complex than=C2=A0QuicTran= sport=C2=A0and it'd be good to have real deployment experience prior to= starting so we know what the requirements are and where the dragons are lu= rking.=C2=A0 Also, the W3C should design APIs that make it easy to detect f= ailure to establish a QUIC-based=C2=A0WebTransport, and this ensures those = are well exercised.=C2=A0 Maybe we DO require pooling under certain conditi= ons and describe those, but there are likely privacy concerns under some ci= rcumstances and I'm not enough of an expert to know what would be accep= table to all clients.

    Some=C2=A0people in the WG m= ay think we have to release a TCP based WebTransport at the same time as a = QUIC based one, but I don't think that's true and even if we standa= rdized them at the same time, it doesn't mean both will achieve wide de= ployment at the same time.=C2=A0 As I said at the mic, I don't see any = reason YouTube would deploy a TCP based WebTransport given it will have to = maintain an HTTP/1.1 option for basically forever and they've spent a g= ood bit of effort to make sure that works as well as it can.=C2=A0 It's= clear to me there are compelling use cases right now for QuicTransport, bu= t=C2=A0the driving use cases for the fallback are not clear to me.=C2=A0 Co= nsistency is intellectually appealing, but doesn't drive deployments.

    Ian

    On Mon, Nov 16, 2020 at 6:36 PM Bern= ard Aboba <= bernard.aboba@gmail.com> wrote:
    D= avid said:=C2=A0

    "Where does this come from? A lot = of QUIC servers are implementing QUIC datagrams, and once you have those th= e delta with h3 datagrams is negligible. Additionally, multiple h3 server i= mplementers=C2=A0have indicated they want to support WebTransport. It's= starting to feel like the pushback on HTTP3Transport=C2=A0is purely based = on a perception of complexity from folks who haven't tried to implement= it? If that's the case, then we should get some implementation experie= nce to confirm or debunk that theory."

    [BA] T= he pooling use cases often involve an interaction between an HTTP/3 request= /response and WebTransport.=C2=A0 so the HTTP/3 Request doesn't just el= icit an HTTP/3 Response.=C2=A0 It also causes something else to happen, som= ething that isn't specified in the HTTP/3 protocol, such as eliciting a= datagram flow or bi/unidirectional stream from the server.=C2=A0 This is w= hat is contemplated in several of the "Live Event" use cases, whe= re the HTTP/3 Request/Response would be requesting the desired Event. The m= ajor advantage over HLS is avoiding Head-of-Line blocking, reducing video f= reezes and stalls.=C2=A0 So developers understand the value that support fo= r datagrams and server-initiated streams can provide - the question is whet= her they'll have all the interoperable pieces in place to deploy it.=C2= =A0

    Just because a generic HTTP/3 server supports= QUIC and WebTransport, doesn't mean that it will support these use cas= es.=C2=A0 I've been asked whether better interoperability and wider eco= system support could be achieved by extending HTTP/3 in a way more in keepi= ng with the existing protocol design - such as by allowing an HTTP/3 Reques= t to specify a resource to be returned in a flow of datagrams.=C2=A0
    <= div>
    The situation might be more tenable if the node.js frame= work had HTTP/3 and QUIC modules on the horizon.

    On Mo= n, Nov 16, 2020 at 1:00 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:
    <= div dir=3D"ltr">

    On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba <bernard.aboba@gmai= l.com> wrote:
    Luke said:=C2=A0

    "My primary concern is that Http3Transport requires = non-generic modifications to the HTTP/3 layer mostly to support connection = pooling. I'm worried that this will limit support for Http3Transport an= d complicates any HTTP/3 implementation that does support it."<= /div>

    [BA] I have also heard this concern from developer= s. The concerns primarily arise from the pooling of HTTP/3 Request/Response= s with WebTransport. This does enable some interesting use cases, such as a= Request/Response (e.g. gRPC) that can result in a server sending datagrams= or initiating bi-directional or uni-directional streams.=C2=A0 So there is= perceived value, but the question is whether that value will be widely sup= ported across the HTTP/3 ecosystem.=C2=A0

    At this = point, most generic HTTP/3 servers are not expected to support HTTP/3 datag= rams (not part of the HTTP/3 protocol) or Http3Transport (perceived as a ni= che protocol), so that pooling would only be possible when using a framewor= k.=C2=A0 node.js will not have=C2=A0QUIC support for 12-18 months (held up = by OpenSSL) so even framework support is expected to be limited.

    Where does this come from? A lot of QUIC = servers are implementing QUIC datagrams, and once you have those the delta = with h3 datagrams is negligible. Additionally, multiple h3 server implement= ers=C2=A0have indicated they want to support WebTransport. It's startin= g to feel like the pushback on HTTP3Transport=C2=A0is purely based on a per= ception of complexity from folks who haven't tried to implement it? If = that's the case, then we should get some implementation experience to c= onfirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David Schinazi <dschinazi.ietf@gmai= l.com> wrote:


    On Mon, Nov 16, 2020 at 11:34 AM= Luke Curley <k= ixelated@gmail.com> wrote:
    We're on the same page that there= 9;s code in HTTP/3 that could be leveraged for QuicTransport in the form of= the header parsing. I think there's a path to merge QuicTransport and = Http3Transport by leveraging HTTP/3 for the handshake and QUIC for stream d= elivery.

    My primary concern is that Http3Transport requi= res non-generic modifications to the HTTP/3 layer mostly to support connect= ion pooling. I'm worried that this will limit support for Http3Transpor= t and complicates any HTTP/3 implementation that does support it.

    Hi Luke,

    I'= m curious, could you elaborate on what these "non-generic modification= s to the HTTP/3 layer" are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com> w= rote:
    Hi Luke,

    On Mon, 16 Nov 2020, = 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clarify, when I say &= quot;QuicTransport is simpler" I really mean "QuicTransport has g= reater interoperability". You can take any QUIC implementation (+ data= gram extension) and add a thin layer to support QuicTransport. It's a n= ice layering of protocols and it's something that I want to see in gene= ral as QUIC replaces TCP.

    Thanks for the clarification. I appreciate= the sentiment. But given the development of QUIC its kind of surprising th= at people would find it easier to identify an implementation that supports = QUIC and datagram but does not support HTTP/3.

    <= /div>
    Thr situation for a more clean-room implementation i= s different, I agree. However, by the time you've done all the hard stu= ff with QUIC, a very focused HTTP/3 layer ends up quite thin too. You can i= gnore dynamic compression, server push and extensibility points.

    I also see the current design bein= g the thin end of the wedge. The proposal I linked talks about HTTP-like he= ader parsing. So its "just" a thin layer to do some parsing. Then= folks will probably want some want to tweak parameter, acontrol channel, a= way to do graceful close, a sprinkle of GREASE. To extrapolate forward, wh= at would be the delta be between some final product QuicTransport and HTTP/= 3. Too small a delta and we've wasted years of effort.

    Cheers
    Lucas


    =

    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <lucaspard= ue.24.7@gmail.com> wrote:
    Hi folks,

    T= o follow up on one thread of discussion during IETF 109. To over simplify w= hat we've heard a few folks say, they prefer QuicTransport because it s= impler and they don't need pooling.

    I'd li= ke to push more on this, what is the measurable complexity of HTTP/3 over Q= UIC plus a new application mapping that needs to be defined? Let's isol= ate pooling as a variable and ignore it.

    Victor me= ntioned his proposal for a unified header semantic across all transports, t= his is https://github.c= om/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. Taking a= closer look at it, I have some concerns that I added as comments. HTTP ha= s semantics for a reason. If QuicTransport is going to start borrowing HTTP= piecemeal, I really wonder how simple people might feel it is. I think it&= #39;s important to avoid something that looks like HTTP but behaves differe= ntly. Is it really much of a stretch to just do HTTP/3 but give it a differ= ent ALPN so that we avoid problems related to cross-protocol pooling?
    =

    Cheers,
    Lucas
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    https://www.ietf.org/mailman/listinfo/webtransport=
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    https://www.ietf.org/mailman/listinfo/webtransport=
    --00000000000018bc6f05b44970b5-- From nobody Tue Nov 17 00:53:21 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id C37803A09F5 for ; Tue, 17 Nov 2020 00:53:19 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=chromium.org Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id guq4bPqEP9ER for ; Tue, 17 Nov 2020 00:53:16 -0800 (PST) Received: from mail-io1-xd2d.google.com (mail-io1-xd2d.google.com [IPv6:2607:f8b0:4864:20::d2d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 01D903A09C3 for ; Tue, 17 Nov 2020 00:53:15 -0800 (PST) Received: by mail-io1-xd2d.google.com with SMTP id t8so20291898iov.8 for ; Tue, 17 Nov 2020 00:53:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=PF9+dwxlUa8PvX3UR9ZURA6ypL98Ib1hz33v3HaQcVI=; b=LwIiRkYzGls1Er6VDKMfuSOYyqKc2/Df4U8mAasq51UJXP3XLQgj0YsL76U8HI58/S h86cTbm9/HnID4qS5FHi9urX4y/7w5rSKG5rXNqkmX7alDtiuHgzTFTKKSxJonHyhHVB ve4CP3/Lpy4ENKX7ggeuJYp3XpmAOED3oAZo4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=PF9+dwxlUa8PvX3UR9ZURA6ypL98Ib1hz33v3HaQcVI=; b=bhgGLZF51YhBzMWpP5jl/wq5xcpJWdvJBHJRMYH/3A34SWhSjJWZHcyjZnITTnsQQh tEgfOLAPNsf/8/O3h7sOVKg2Btb6pnd8ODGvZQBnF5dAGBbW/t06x++IdkPXwNhr1hD5 W83owsJ8iEEkgKKHruUx5kJfOeGUur1vH/wYvmJ+ttEuuwyTskI7an7akegJlPqL3/PB XuhKs5NEO7HPz2XFd/7lL8VoNil/kA5cjuYkCXGEN5ixilXE7M1NdGM9zdEARAmJroA6 WdceduaxBreeZhgQ8eSyirSovu8hZkGETKNb1OfMm5g/htpNCwhfHOaIv9ERVtAZVEUe g7cA== X-Gm-Message-State: AOAM533ejtTqvSXQ7qyOk3TjZwaKoh7u1atxAYBeFiW6J8N2EyPO0R6R dViYjmQS25AVjZiK6IK9owo8IHujLPinijuDCLpGmg== X-Google-Smtp-Source: ABdhPJzZom2EzbRFDw873RWtoirprQb+LgXTa2lXMkuWrIWTXuy2Rl+bEHwbrFdhGe11lclCYJ4n5IYLquSYcAzeVr4= X-Received: by 2002:a02:a1dc:: with SMTP id o28mr2699126jah.109.1605603194962; Tue, 17 Nov 2020 00:53:14 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Adam Rice Date: Tue, 17 Nov 2020 17:53:04 +0900 Message-ID: To: Kazuho Oku Cc: David Schinazi , Bernard Aboba , Ian Swett , Luke Curley , WebTransport , Lucas Pardue Content-Type: multipart/alternative; boundary="000000000000161ada05b449a063" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 08:53:20 -0000 --000000000000161ada05b449a063 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable > > From the perspective of a HTTP server-side deployment that intends to > support WebTransport, it would be helpful if the handshake used HTTP > request-response, because then we could reuse all the stuff that we have > for HTTP. I think doing so has been helpful with websockets. In my opinion, the expectation of working like HTTP has been detrimental to websockets. First it led to feature creep, with cookies, HTTP auth, and many miscellaneous HTTP features being added to WebSockets. Now people are demanding the ability to add arbitrary headers , which would require a CORS preflight. Secondly, it led to great implementation complexity. Initially in Chrome we had a parallel implementation of much of the HTTP stack, which became unsustainable as more features were added. Then we started sharing the existing HTTP stack, which led to it being littered with branches where WebSockets require different behaviour, and a nasty layering violation to implement "Upgrade". I recommend doing nothing that would create an expectation that QuicTransport would have HTTP semantics. On Tue, 17 Nov 2020 at 11:00, Kazuho Oku wrote: > David, thank you for breaking down the topics. > > My responses inline. > > 2020=E5=B9=B411=E6=9C=8817=E6=97=A5(=E7=81=AB) 10:10 David Schinazi : > >> I'd like us to take a step back, I think we're conflating many different >> topics here, and it's making it impossible to reason about this (at leas= t >> for someone running on not enough sleep like I am this week). >> >> Topic 1: the complexity of implementing Http3Transport as opposed to >> QuicTransport on the client >> From my perspective, all browsers interested in WebTransport are >> implementing HTTP/3, so I don't see much complexity there. >> Please reply here if you know of complexities I'm not seeing >> >> Topic 2: the complexity of implementing Http3Transport as opposed to >> QuicTransport on the server >> As far as I know, most server-side QUIC stacks also support HTTP/3, >> and for QuicTransport they already have DATAGRAM support so I think the >> delta is negligible. >> Please reply here if you know of complexities I'm not seeing >> > > I might insert: > > Topic 2b: the complexity of implementing QuicTransport as opposed to > Http3Transport on the server. > > IIUC, status quo of QuicTransport is much like HTTP/0.9, that upgrades th= e > connection to use datagrams once the server acknowledges the request. > > By saying HTTP/0.9, I am pointing out that there are no header fields, an= d > the problem is that things like authentication are missing, as Lucas > pointed out elsewhere. > > From the perspective of a HTTP server-side deployment that intends to > support WebTransport, it would be helpful if the handshake used HTTP > request-response, because then we could reuse all the stuff that we have > for HTTP. I think doing so has been helpful with websockets. > > I do understand the concern that wire encoding of HTTP/3 seems complicate= d > to people who are only interested in implementing WebTransport. We should > try to accommodate that concern. However, I think there's value in adopti= ng > the semantics of HTTP [1] to the handshake of WebTransport, and that the > natural path forward would be to use (a subset of) HTTP/3 for the purpose= . > > >> Topic 3: the benefits of pooling WebTransport >> This allows saving round trips to get WebTransport up and running >> This allows sharing congestion control state >> This allows letting the QUIC implementation prioritize DATAGRAMs vs >> HTTP requests instead of relying on the kernel or routers which have les= s >> information >> Overall, I think pooling is beneficial (though not an absolute >> must-have) >> Please reply here if you know of benefits I'm not seeing >> >> Topic 4: the difficulty of pooling Http3Transport on the client >> It appears that all browsers that are interested in WebTransport are >> implementing pooling in their HTTP/3 stack so additionally pooling >> WebTransport should not introduce more complexity >> Please reply here if you know of complexities I'm not seeing >> >> Topic 5: the difficulty of pooling Http3Transport on the server >> This one is trickier. If you have frontends that know how to route >> HTTP requests to backends, DATAGRAM support is going to be a whole new >> world. >> However, and I think this is really important: implementing this on >> the server is OPTIONAL. >> The server can easily use a different hostname (and different TLS >> certificates) for HTTP vs WebTransport and clients will not pool the two >> together. >> Once you use different domain names per WebTransport object, >> Http3Transport has the exact same pooling properties as QuicTransport. >> Please reply here if you know of complexities I'm not seeing >> > > I think pooling is optional to both the client and server, regardless of > the protocol that we choose. That was the case for websockets until RFC > 8441 was standardized, and even after that, endpoints have the option to > use dedicated connection. > > [1] https://httpwg.org/http-core/draft-ietf-httpbis-semantics-latest.html > > >> What am I missing? >> >> Thanks, >> David >> >> >> On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: >> >>> I'm *very* concerned about any functionality that *requires* pooling. >>> Pooling is a client-specific optimization and pooling policy is subject= to >>> change(within reason) at any time. If applications are saying "it'd be >>> cool if we could share congestion control and loss recovery state betwe= en >>> H3 and WebTransport most of the time", then I can see there being >>> real(albeit small) benefits, just like there would be for putting >>> DataChannels and RTP into one QUIC connection for WebRTC. If people ar= e >>> intending to rely on pooling so an HTTP(hopefully H3) request can trigg= er a >>> WebTransport response, I think we're in a world of pain and >>> over-optimization. >>> >>> This is more obvious in light of the fact that a WebTransport >>> endpoint is likely not a generic CDN endpoint, as has been clearly stat= ed >>> by Mark Nottingham. >>> >>> Bernard's comments above point to a tighter coupling between HTTP/3 and >>> WebTransport than I think is practical in production, unless I >>> misunderstood(which I may have, it's been a long day). >>> >>> All of this makes me think we should punt the HTTP based WebTransport >>> options down the road a year or so and focus on QuicTransport initially= . >>> It's not to say we won't do them, but they're clearly more complex >>> than QuicTransport and it'd be good to have real deployment experience >>> prior to starting so we know what the requirements are and where the >>> dragons are lurking. Also, the W3C should design APIs that make it eas= y to >>> detect failure to establish a QUIC-based WebTransport, and this ensures >>> those are well exercised. Maybe we DO require pooling under certain >>> conditions and describe those, but there are likely privacy concerns un= der >>> some circumstances and I'm not enough of an expert to know what would b= e >>> acceptable to all clients. >>> >>> Some people in the WG may think we have to release a TCP based >>> WebTransport at the same time as a QUIC based one, but I don't think th= at's >>> true and even if we standardized them at the same time, it doesn't mean >>> both will achieve wide deployment at the same time. As I said at the m= ic, >>> I don't see any reason YouTube would deploy a TCP based WebTransport gi= ven >>> it will have to maintain an HTTP/1.1 option for basically forever and >>> they've spent a good bit of effort to make sure that works as well as i= t >>> can. It's clear to me there are compelling use cases right now for >>> QuicTransport, but the driving use cases for the fallback are not clear= to >>> me. Consistency is intellectually appealing, but doesn't drive deploym= ents. >>> >>> Ian >>> >>> On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba >>> wrote: >>> >>>> David said: >>>> >>>> "Where does this come from? A lot of QUIC servers are implementing QUI= C >>>> datagrams, and once you have those the delta with h3 datagrams is >>>> negligible. Additionally, multiple h3 server implementers have indicat= ed >>>> they want to support WebTransport. It's starting to feel like the push= back >>>> on HTTP3Transport is purely based on a perception of complexity from f= olks >>>> who haven't tried to implement it? If that's the case, then we should = get >>>> some implementation experience to confirm or debunk that theory." >>>> >>>> [BA] The pooling use cases often involve an interaction between an >>>> HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn= 't >>>> just elicit an HTTP/3 Response. It also causes something else to happ= en, >>>> something that isn't specified in the HTTP/3 protocol, such as eliciti= ng a >>>> datagram flow or bi/unidirectional stream from the server. This is wh= at is >>>> contemplated in several of the "Live Event" use cases, where the HTTP/= 3 >>>> Request/Response would be requesting the desired Event. The major adva= ntage >>>> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >>>> stalls. So developers understand the value that support for datagrams= and >>>> server-initiated streams can provide - the question is whether they'll= have >>>> all the interoperable pieces in place to deploy it. >>>> >>>> Just because a generic HTTP/3 server supports QUIC and WebTransport, >>>> doesn't mean that it will support these use cases. I've been asked wh= ether >>>> better interoperability and wider ecosystem support could be achieved = by >>>> extending HTTP/3 in a way more in keeping with the existing protocol d= esign >>>> - such as by allowing an HTTP/3 Request to specify a resource to be >>>> returned in a flow of datagrams. >>>> >>>> The situation might be more tenable if the node.js framework had HTTP/= 3 >>>> and QUIC modules on the horizon. >>>> >>>> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi < >>>> dschinazi.ietf@gmail.com> wrote: >>>> >>>>> >>>>> >>>>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba < >>>>> bernard.aboba@gmail.com> wrote: >>>>> >>>>>> Luke said: >>>>>> >>>>>> "My primary concern is that Http3Transport requires non-generic >>>>>> modifications to the HTTP/3 layer mostly to support connection pooli= ng. I'm >>>>>> worried that this will limit support for Http3Transport and complica= tes any >>>>>> HTTP/3 implementation that does support it." >>>>>> >>>>>> [BA] I have also heard this concern from developers. The concerns >>>>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>>>> WebTransport. This does enable some interesting use cases, such as a >>>>>> Request/Response (e.g. gRPC) that can result in a server sending dat= agrams >>>>>> or initiating bi-directional or uni-directional streams. So there i= s >>>>>> perceived value, but the question is whether that value will be wide= ly >>>>>> supported across the HTTP/3 ecosystem. >>>>>> >>>>>> At this point, most generic HTTP/3 servers are not expected to >>>>>> support HTTP/3 datagrams (not part of the HTTP/3 protocol) or >>>>>> Http3Transport (perceived as a niche protocol), so that pooling woul= d only >>>>>> be possible when using a framework. node.js will not have QUIC supp= ort for >>>>>> 12-18 months (held up by OpenSSL) so even framework support is expec= ted to >>>>>> be limited. >>>>>> >>>>> >>>>> Where does this come from? A lot of QUIC servers are implementing QUI= C >>>>> datagrams, and once you have those the delta with h3 datagrams is >>>>> negligible. Additionally, multiple h3 server implementers have indica= ted >>>>> they want to support WebTransport. It's starting to feel like the pus= hback >>>>> on HTTP3Transport is purely based on a perception of complexity from = folks >>>>> who haven't tried to implement it? If that's the case, then we should= get >>>>> some implementation experience to confirm or debunk that theory. >>>>> >>>>> >>>>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>> >>>>>>> >>>>>>> >>>>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>>>> wrote: >>>>>>> >>>>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>>>> leveraged for QuicTransport in the form of the header parsing. I t= hink >>>>>>>> there's a path to merge QuicTransport and Http3Transport by levera= ging >>>>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>>>> >>>>>>>> My primary concern is that Http3Transport requires non-generic >>>>>>>> modifications to the HTTP/3 layer mostly to support connection poo= ling. I'm >>>>>>>> worried that this will limit support for Http3Transport and compli= cates any >>>>>>>> HTTP/3 implementation that does support it. >>>>>>>> >>>>>>> >>>>>>> Hi Luke, >>>>>>> >>>>>>> I'm curious, could you elaborate on what these "non-generic >>>>>>> modifications to the HTTP/3 layer" are please? >>>>>>> >>>>>>> Thanks, >>>>>>> David >>>>>>> >>>>>>> >>>>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>> >>>>>>>>> Hi Luke, >>>>>>>>> >>>>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really >>>>>>>>>> mean "QuicTransport has greater interoperability". You can take = any QUIC >>>>>>>>>> implementation (+ datagram extension) and add a thin layer to su= pport >>>>>>>>>> QuicTransport. It's a nice layering of protocols and it's someth= ing that I >>>>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>>>> >>>>>>>>> >>>>>>>>> Thanks for the clarification. I appreciate the sentiment. But >>>>>>>>> given the development of QUIC its kind of surprising that people = would find >>>>>>>>> it easier to identify an implementation that supports QUIC and da= tagram but >>>>>>>>> does not support HTTP/3. >>>>>>>>> >>>>>>>>> Thr situation for a more clean-room implementation is different, = I >>>>>>>>> agree. However, by the time you've done all the hard stuff with Q= UIC, a >>>>>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore = dynamic >>>>>>>>> compression, server push and extensibility points. >>>>>>>>> >>>>>>>>> I also see the current design being the thin end of the wedge. Th= e >>>>>>>>> proposal I linked talks about HTTP-like header parsing. So its "j= ust" a >>>>>>>>> thin layer to do some parsing. Then folks will probably want some= want to >>>>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a = sprinkle >>>>>>>>> of GREASE. To extrapolate forward, what would be the delta be bet= ween some >>>>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we'= ve wasted >>>>>>>>> years of effort. >>>>>>>>> >>>>>>>>> Cheers >>>>>>>>> Lucas >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>> >>>>>>>>>>> Hi folks, >>>>>>>>>>> >>>>>>>>>>> To follow up on one thread of discussion during IETF 109. To >>>>>>>>>>> over simplify what we've heard a few folks say, they prefer Qui= cTransport >>>>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>>>> >>>>>>>>>>> I'd like to push more on this, what is the measurable complexit= y >>>>>>>>>>> of HTTP/3 over QUIC plus a new application mapping that needs t= o be >>>>>>>>>>> defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>>>> >>>>>>>>>>> Victor mentioned his proposal for a unified header semantic >>>>>>>>>>> across all transports, this is >>>>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overvie= w/pull/4/files. >>>>>>>>>>> Taking a closer look at it, I have some concerns that I added a= s comments. >>>>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to s= tart >>>>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people mig= ht feel it >>>>>>>>>>> is. I think it's important to avoid something that looks like H= TTP but >>>>>>>>>>> behaves differently. Is it really much of a stretch to just do = HTTP/3 but >>>>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>>>> cross-protocol pooling? >>>>>>>>>>> >>>>>>>>>>> Cheers, >>>>>>>>>>> Lucas >>>>>>>>>>> -- >>>>>>>>>>> Webtransport mailing list >>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>> >>>>>>>>>> -- >>>>>>>> Webtransport mailing list >>>>>>>> Webtransport@ietf.org >>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>> >>>>>>> -- >>>>>>> Webtransport mailing list >>>>>>> Webtransport@ietf.org >>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>> >>>>>> -- >>>> Webtransport mailing list >>>> Webtransport@ietf.org >>>> https://www.ietf.org/mailman/listinfo/webtransport >>>> >>> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > > > -- > Kazuho Oku > -- > Webtransport mailing list > Webtransport@ietf.org > https://www.ietf.org/mailman/listinfo/webtransport > --000000000000161ada05b449a063 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    From the= perspective of a HTTP server-side deployment that intends to support WebTr= ansport, it would be helpful if the handshake used HTTP request-response, b= ecause then we could reuse all the stuff that we have for HTTP. I think doi= ng so has been helpful with websockets.=C2=A0

    In my opinion, the expectation of working like HTTP has been detrimental= to websockets. First it led to feature creep, with cookies, HTTP auth, and= many miscellaneous HTTP features being added to WebSockets. Now people are= demanding the abili= ty to add arbitrary headers, which would require a CORS preflight.
    <= /div>

    Secondly, it led to great implementation complexit= y. Initially in Chrome we had a parallel implementation of much of the HTTP= stack, which became unsustainable as more features were added. Then we sta= rted sharing the existing HTTP stack, which led to it being littered with b= ranches where WebSockets require different behaviour, and a nasty layering = violation to implement "Upgrade".

    I reco= mmend doing nothing that would create an expectation that QuicTransport=C2= =A0would have HTTP semantics.

    On Tue, 17 Nov 2020 at 11:00, Kazuho Oku= <kazuhooku@gmail.com> wro= te:
    David, thank you for breaking down the topics.

    My responses inline.

    2020=E5=B9=B411=E6=9C=8817=E6=97=A5(=E7=81= =AB) 10:10 David Schinazi <dschinazi.ietf@gmail.com>:
    I'd like us to take= a step back, I think we're conflating many different topics here, and = it's making it impossible to reason about this (at least for someone ru= nning on not enough sleep like I am this week).

    Topic 1:= the complexity of implementing=C2=A0Http3Transport=C2=A0as opposed to Quic= Transport=C2=A0on the client
    =C2=A0 =C2=A0 From my perspective, a= ll browsers interested in WebTransport are implementing HTTP/3, so I don= 9;t see much complexity there.
    =C2=A0 =C2=A0 Please reply here if= you know of complexities I'm not seeing

    = Topic 2: the complexity of implementing=C2=A0Http3Transport=C2=A0as opposed= to QuicTransport=C2=A0on the server
    =C2=A0 =C2=A0 As far a= s I know, most server-side QUIC stacks also support HTTP/3, and for QuicTra= nsport=C2=A0they already have DATAGRAM support so I think the delta is negl= igible.
    =C2=A0 =C2=A0 Please reply here if you know of complexiti= es I'm not seeing

    I might i= nsert:

    Topic 2b: the complexity of implementing Qu= icTransport as opposed to Http3Transport on the server.

    IIUC, status quo of QuicTransport is much like HTTP/0.9, that upgrade= s the connection to use datagrams once the server acknowledges the request.=

    By saying HTTP/0.9, I am pointing out that there = are no header fields, and the problem is that things like authentication ar= e missing, as Lucas pointed out elsewhere.

    Fro= m the perspective of a HTTP server-side deployment that intends to support = WebTransport, it would be helpful if the handshake used HTTP request-respon= se, because then we could reuse all the stuff that we have for HTTP. I thin= k doing so has been helpful with websockets.

    I do = understand the concern that wire encoding of HTTP/3 seems complicated to pe= ople who are only interested in implementing WebTransport. We should try to= accommodate that concern. However, I think there's value in adopting t= he semantics of HTTP [1] to the handshake of WebTransport, and that the nat= ural path forward would be to use (a subset of) HTTP/3 for the purpose.
    =


    Topic 3: the benefits of poolin= g WebTransport
    =C2=A0 =C2=A0 This allows saving round trips to ge= t WebTransport up and running
    =C2=A0 =C2=A0 This allows sharing c= ongestion control state
    =C2=A0 =C2=A0 This allows letting the QUI= C implementation prioritize DATAGRAMs vs HTTP requests instead of relying o= n the kernel or routers which have less information
    =C2=A0 =C2=A0= Overall, I think pooling is beneficial (though not an absolute must-have)<= /div>
    =C2=A0 =C2=A0 Please reply here if you know of benefits I'm n= ot seeing

    Topic 4: the difficulty of pooling H= ttp3Transport=C2=A0on the client
    =C2=A0 =C2=A0 It appears that al= l browsers that are interested in WebTransport are implementing pooling in = their HTTP/3 stack so additionally pooling WebTransport should not introduc= e more complexity
    =C2=A0 =C2=A0 Please reply here if you know of = complexities I'm not seeing

    To= pic 5: the difficulty of pooling Http3Transport=C2=A0on the server
    =C2=A0 =C2=A0 This one is trickier. If you have frontends that know= how to route HTTP=C2=A0requests to backends, DATAGRAM support is going to = be a whole new world.
    =C2=A0 =C2=A0 However, and I think this is = really important: implementing this on the server is OPTIONAL.
    = =C2=A0 =C2=A0 The server can easily use a different hostname (and different= TLS certificates) for HTTP vs WebTransport and clients will not pool the t= wo together.
    =C2=A0 =C2=A0 Once you use different domain names pe= r WebTransport object, Http3Transport=C2=A0has the exact same pooling prope= rties as QuicTransport.
    =C2=A0 =C2=A0 Please reply here if you kn= ow of complexities I'm not seeing

    =
    I think pooling is optional to both the client and server, regar= dless of the protocol that we choose. That was the case for websockets unti= l RFC 8441 was standardized, and even after that, endpoints have the option= to use dedicated connection.



    What am I missing?<= /div>

    Thanks,
    David

    =
    On Mon= , Nov 16, 2020 at 4:45 PM Ian Swett <ianswett@google.com> wrote:
    I'm very concerned about any functionality that requires pooling.=C2=A0 Po= oling is a client-specific optimization and pooling policy is subject to ch= ange(within reason) at any time.=C2=A0 If applications=C2=A0are saying &quo= t;it'd be cool if we could share congestion control and loss recovery s= tate between H3 and WebTransport most of the time", then I can see the= re being real(albeit small) benefits, just like there would be for putting = DataChannels and RTP into one QUIC connection for WebRTC.=C2=A0 If people a= re intending to rely on pooling so an HTTP(hopefully H3) request can trigge= r a WebTransport response, I think we're in a world of pain and over-op= timization.

    This is more obvious in light of the fact th= at a WebTransport endpoint=C2=A0is likely not a generic CDN endpoint, as ha= s been clearly stated by Mark Nottingham.

    Bernard= 9;s comments above point to a tighter coupling between HTTP/3 and WebTransp= ort than I think is practical in production, unless I misunderstood(which I= may have, it's been a long day).

    All of this = makes me think we should punt the HTTP based WebTransport options down the = road a year or so and focus on QuicTransport=C2=A0initially.=C2=A0 It's= not to say we won't do them, but they're clearly more complex than= =C2=A0QuicTransport=C2=A0and it'd be good to have real deployment exper= ience prior to starting so we know what the requirements are and where the = dragons are lurking.=C2=A0 Also, the W3C should design APIs that make it ea= sy to detect failure to establish a QUIC-based=C2=A0WebTransport, and this = ensures those are well exercised.=C2=A0 Maybe we DO require pooling under c= ertain conditions and describe those, but there are likely privacy concerns= under some circumstances and I'm not enough of an expert to know what = would be acceptable to all clients.

    Some=C2=A0peop= le in the WG may think we have to release a TCP based WebTransport at the s= ame time as a QUIC based one, but I don't think that's true and eve= n if we standardized them at the same time, it doesn't mean both will a= chieve wide deployment at the same time.=C2=A0 As I said at the mic, I don&= #39;t see any reason YouTube would deploy a TCP based WebTransport given it= will have to maintain an HTTP/1.1 option for basically forever and they= 9;ve spent a good bit of effort to make sure that works as well as it can.= =C2=A0 It's clear to me there are compelling use cases right now for Qu= icTransport, but=C2=A0the driving use cases for the fallback are not clear = to me.=C2=A0 Consistency is intellectually appealing, but doesn't drive= deployments.

    Ian

    On Mon, Nov 16, 2020= at 6:36 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:
    David said:=C2=A0

    "Where does this c= ome from? A lot of QUIC servers are implementing QUIC datagrams, and once y= ou have those the delta with h3 datagrams is negligible. Additionally, mult= iple h3 server implementers=C2=A0have indicated they want to support WebTra= nsport. It's starting to feel like the pushback on HTTP3Transport=C2=A0= is purely based on a perception of complexity from folks who haven't tr= ied to implement it? If that's the case, then we should get some implem= entation experience to confirm or debunk that theory."

    <= /div>
    [BA] The pooling use cases often involve an interaction between a= n HTTP/3 request/response and WebTransport.=C2=A0 so the HTTP/3 Request doe= sn't just elicit an HTTP/3 Response.=C2=A0 It also causes something els= e to happen, something that isn't specified in the HTTP/3 protocol, suc= h as eliciting a datagram flow or bi/unidirectional stream from the server.= =C2=A0 This is what is contemplated in several of the "Live Event"= ; use cases, where the HTTP/3 Request/Response would be requesting the desi= red Event. The major advantage over HLS is avoiding Head-of-Line blocking, = reducing video freezes and stalls.=C2=A0 So developers understand the value= that support for datagrams and server-initiated streams can provide - the = question is whether they'll have all the interoperable pieces in place = to deploy it.=C2=A0

    Just because a generic HTTP/3= server supports QUIC and WebTransport, doesn't mean that it will suppo= rt these use cases.=C2=A0 I've been asked whether better interoperabili= ty and wider ecosystem support could be achieved by extending HTTP/3 in a w= ay more in keeping with the existing protocol design - such as by allowing = an HTTP/3 Request to specify a resource to be returned in a flow of datagra= ms.=C2=A0

    The situation might be more tenable if t= he node.js framework had HTTP/3 and QUIC modules on the horizon.
    <= /div>

    On Mon, Nov 16, 2020 at 1:00 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:


    On Mon, Nov 16, 2020 at 12:40 PM Bernar= d Aboba <be= rnard.aboba@gmail.com> wrote:
    Luke said:=C2=A0

    &= quot;My primary concern is that Http3Tra= nsport requires non-generic modifications to the HTTP/3 layer mostly to sup= port connection pooling. I'm worried that this will limit support for H= ttp3Transport and complicates any HTTP/3 implementation that does support i= t."

    [BA] I have also heard this concer= n from developers. The concerns primarily arise from the pooling of HTTP/3 = Request/Responses with WebTransport. This does enable some interesting use = cases, such as a Request/Response (e.g. gRPC) that can result in a server s= ending datagrams or initiating bi-directional or uni-directional streams.= =C2=A0 So there is perceived value, but the question is whether that value = will be widely supported across the HTTP/3 ecosystem.=C2=A0

    <= /div>
    At this point, most generic HTTP/3 servers are not expected to su= pport HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport = (perceived as a niche protocol), so that pooling would only be possible whe= n using a framework.=C2=A0 node.js will not have=C2=A0QUIC support for 12-1= 8 months (held up by OpenSSL) so even framework support is expected to be l= imited.

    Where does this come fr= om? A lot of QUIC servers are implementing QUIC datagrams, and once you hav= e those the delta with h3 datagrams is negligible. Additionally, multiple h= 3 server implementers=C2=A0have indicated they want to support WebTransport= . It's starting to feel like the pushback on HTTP3Transport=C2=A0is pur= ely based on a perception of complexity from folks who haven't tried to= implement it? If that's the case, then we should get some implementati= on experience to confirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David S= chinazi <d= schinazi.ietf@gmail.com> wrote:


    On Mon, Nov 16= , 2020 at 11:34 AM Luke Curley <kixelated@gmail.com> wrote:
    We're on the same = page that there's code in HTTP/3 that could be leveraged for QuicTransp= ort in the form of the header parsing. I think there's a path to merge = QuicTransport and Http3Transport by leveraging HTTP/3 for the handshake and= QUIC for stream delivery.

    My primary concern is that Ht= tp3Transport requires non-generic modifications to the HTTP/3 layer mostly = to support connection pooling. I'm worried that this will limit support= for Http3Transport and complicates any HTTP/3 implementation that does sup= port it.

    Hi Luke,
    I'm curious, could you elaborate on what these "non-ge= neric modifications to the HTTP/3 layer" are please?

    Thanks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@g= mail.com> wrote:
    Hi Luke,

    On Mo= n, 16 Nov 2020, 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clari= fy, when I say "QuicTransport is simpler" I really mean "Qui= cTransport has greater interoperability". You can take any QUIC implem= entation (+ datagram extension) and add a thin layer to support QuicTranspo= rt. It's a nice layering of protocols and it's something that I wan= t to see in general as QUIC replaces TCP.

    Thanks for the clarificati= on. I appreciate the sentiment. But given the development of QUIC its kind = of surprising that people would find it easier to identify an implementatio= n that supports QUIC and datagram but does not support HTTP/3.

    Thr situation for a more clean-room = implementation is different, I agree. However, by the time you've done = all the hard stuff with QUIC, a very focused HTTP/3 layer ends up quite thi= n too. You can ignore dynamic compression, server push and extensibility po= ints.

    I also see the cur= rent design being the thin end of the wedge. The proposal I linked talks ab= out HTTP-like header parsing. So its "just" a thin layer to do so= me parsing. Then folks will probably want some want to tweak parameter, aco= ntrol channel, a way to do graceful close, a sprinkle of GREASE. To extrapo= late forward, what would be the delta be between some final product QuicTra= nsport and HTTP/3. Too small a delta and we've wasted years of effort.<= /div>

    Cheers
    Lucas



    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <= ;lucaspardue.24.7@gmail.com> wrote:
    Hi folks,

    To follow up on one thread of discussion during IETF 109. = To over simplify what we've heard a few folks say, they prefer QuicTran= sport because it simpler and they don't need pooling.

    I'd like to push more on this, what is the measurable complexit= y of HTTP/3 over QUIC plus a new application mapping that needs to be defin= ed? Let's isolate pooling as a variable and ignore it.

    Victor mentioned his proposal for a unified header semantic across= all transports, this is https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/f= iles. Taking a closer look at it, I have some concerns that I added as = comments. HTTP has semantics for a reason. If QuicTransport is going to st= art borrowing HTTP piecemeal, I really wonder how simple people might feel = it is. I think it's important to avoid something that looks like HTTP b= ut behaves differently. Is it really much of a stretch to just do HTTP/3 bu= t give it a different ALPN so that we avoid problems related to cross-proto= col pooling?

    Cheers,
    Lucas
    --
    Webtransport mailing list
    Webtransport@ietf.org
    https://www.ietf.org/mailman/listinfo/w= ebtransport
    --
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    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
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    https://www.ietf.org/mailman/listinfo/webtransport=
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    https://www.ietf.org/mailman/listinfo/webtransport=
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    https://www.ietf.org/mailman/listinfo/webtransport=


    --
    Kazuho Oku=
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    https://www.ietf.org/mailman/listinfo/webtransport=
    --000000000000161ada05b449a063-- From nobody Tue Nov 17 00:58:41 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 1B9D33A0A20 for ; Tue, 17 Nov 2020 00:58:39 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Srq5_QfQkIgj for ; Tue, 17 Nov 2020 00:58:36 -0800 (PST) Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A7E1C3A0A1F for ; Tue, 17 Nov 2020 00:58:35 -0800 (PST) Received: by mail-lf1-x129.google.com with SMTP id j205so29059545lfj.6 for ; Tue, 17 Nov 2020 00:58:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=jmwxSmpXlXF4IXs6xnRR1rCMY3sM9jXw3owJq2Dd4lU=; b=cRzuBZq3AWh5qHWV/Uumiiq9ftJTCpjJ5EmgQSJWKi3aCRJC7klIDX9ZkpuSANxUKP bMvSQzo5FHEFSmgyQbAnXvjHB92Ii44UzeSJ0Buf7RFV8lKNKbpjhECvN9NtniU3ob0O xsqhFnG2bedfGywln9cpvoJNOfofcPKopvGu8/3hF2zJXowkr6kxTby78Am7cqGd8e3T KAyHt0S1idRaB1GAxZvfzeLrtT/udsJPh1vqrTijfBymB1jPddLnc8H9VBXfbHecnrsq U3dD6EoNmyBedpFXAKkwjnssu/MluFSPd0NFw4cAL3COxg4MzGT1BhCHjDHrlSlqzIa0 nGnQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=jmwxSmpXlXF4IXs6xnRR1rCMY3sM9jXw3owJq2Dd4lU=; b=IcN3dVcOvDrz1UkfVMzMdwp7QWzk8T3B3PPZuh8GtIU5njPXApwKSyOFBQ8g1qprdb qqDJCN8wMHtD7nLd+NwfLvyVSXqak6mz9syVtmQhIuoyXS7dBQQcDXA31ZoMKdiszMos nOIxglO+Jkp5HsFfiYqjF81DNGIDi655pXr0jhvZ208P7qCOGJR5JbyrE7+qesfwxX6R 2hqffl8CsqLBZO6aR2HqBCK5qwJzIe3bxjpTydm5wTCN5I4IVPq8vm+SCPYMCDIjbWl8 /eVIvhnZInsla+wuTlwkT17IXau0kgxaDx46Y1TfGjYAiS8Li0GbwAT6Hhlvl04J7svh W5CA== X-Gm-Message-State: AOAM531PVgbpKZ83zp6kRVHS762CxPQBG+pytsSnZYS3YXLS3xRkz440 qpUvdmIGwlz0l+qqySZl9uQ73Fvey5z01dVcaF4= X-Google-Smtp-Source: ABdhPJwd4zYC0hT99UNYpPo4+MhJvASEf5sOUytNE/GGQeyefC/ekQHYYdW685vMW8envJtGEnuSaUAUZju1/L7ldM4= X-Received: by 2002:a19:88c:: with SMTP id 134mr1240371lfi.560.1605603513723; Tue, 17 Nov 2020 00:58:33 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Bernard Aboba Date: Tue, 17 Nov 2020 00:58:23 -0800 Message-ID: To: Ian Swett Cc: David Schinazi , WebTransport , Luke Curley , Lucas Pardue Content-Type: multipart/alternative; boundary="00000000000015ee6805b449b37c" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 08:58:39 -0000 --00000000000015ee6805b449b37c Content-Type: text/plain; charset="UTF-8" Ian said: "If people are intending to rely on pooling so an HTTP(hopefully H3) request can trigger a WebTransport response, I think we're in a world of pain and over-optimization. This is more obvious in light of the fact that a WebTransport endpoint is likely not a generic CDN endpoint, as has been clearly stated by Mark Nottingham. Bernard's comments above point to a tighter coupling between HTTP/3 and WebTransport than I think is practical in production, unless I misunderstood(which I may have, it's been a long day)." [BA] The developers I have talked to (about the "event streaming" use case) have exactly this concern - that a tight coupling between HTTP/3 and Http3Transport would be potentially brittle and non-interoperable. QuicTransport offers the same potential benefits (avoidance of HoL blocking, ability to mix reliable request/response with datagrams), but because it is simpler there are a wider range of tools available and interop risks seem lower. Only perceived downside is the amount of cloud infrastructure (e.g. load balancing, caching, etc.) they would need to build themselves. "As I said at the mic, I don't see any reason YouTube would deploy a TCP based WebTransport given it will have to maintain an HTTP/1.1 option for basically forever and they've spent a good bit of effort to make sure that works as well as it can." [BA] I have heard similar things with respect to "fallback" from developers. From their perspective, it is ideally something very solid and widely deployed, not itself a new(er) technology. Depending on the use case, the "fallback" was often the technology that they were already using, which they hoped that QuicTransport could eventually replace. But since the fallback technology was the current incumbent, there was little interest in introducing a new fallback technology (HTTP/2) and a new incumbent (QuicTransport) at the same time. That was considered to be unnecessary risk. On Mon, Nov 16, 2020 at 4:45 PM Ian Swett wrote: > I'm *very* concerned about any functionality that *requires* pooling. > Pooling is a client-specific optimization and pooling policy is subject to > change(within reason) at any time. If applications are saying "it'd be > cool if we could share congestion control and loss recovery state between > H3 and WebTransport most of the time", then I can see there being > real(albeit small) benefits, just like there would be for putting > DataChannels and RTP into one QUIC connection for WebRTC. If people are > intending to rely on pooling so an HTTP(hopefully H3) request can trigger a > WebTransport response, I think we're in a world of pain and > over-optimization. > > This is more obvious in light of the fact that a WebTransport endpoint is > likely not a generic CDN endpoint, as has been clearly stated by Mark > Nottingham. > > Bernard's comments above point to a tighter coupling between HTTP/3 and > WebTransport than I think is practical in production, unless I > misunderstood(which I may have, it's been a long day). > > All of this makes me think we should punt the HTTP based WebTransport > options down the road a year or so and focus on QuicTransport initially. > It's not to say we won't do them, but they're clearly more complex > than QuicTransport and it'd be good to have real deployment experience > prior to starting so we know what the requirements are and where the > dragons are lurking. Also, the W3C should design APIs that make it easy to > detect failure to establish a QUIC-based WebTransport, and this ensures > those are well exercised. Maybe we DO require pooling under certain > conditions and describe those, but there are likely privacy concerns under > some circumstances and I'm not enough of an expert to know what would be > acceptable to all clients. > > Some people in the WG may think we have to release a TCP based > WebTransport at the same time as a QUIC based one, but I don't think that's > true and even if we standardized them at the same time, it doesn't mean > both will achieve wide deployment at the same time. As I said at the mic, > I don't see any reason YouTube would deploy a TCP based WebTransport given > it will have to maintain an HTTP/1.1 option for basically forever and > they've spent a good bit of effort to make sure that works as well as it > can. It's clear to me there are compelling use cases right now for > QuicTransport, but the driving use cases for the fallback are not clear to > me. Consistency is intellectually appealing, but doesn't drive deployments. > > Ian > > On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba > wrote: > >> David said: >> >> "Where does this come from? A lot of QUIC servers are implementing QUIC >> datagrams, and once you have those the delta with h3 datagrams is >> negligible. Additionally, multiple h3 server implementers have indicated >> they want to support WebTransport. It's starting to feel like the pushback >> on HTTP3Transport is purely based on a perception of complexity from folks >> who haven't tried to implement it? If that's the case, then we should get >> some implementation experience to confirm or debunk that theory." >> >> [BA] The pooling use cases often involve an interaction between an HTTP/3 >> request/response and WebTransport. so the HTTP/3 Request doesn't just >> elicit an HTTP/3 Response. It also causes something else to happen, >> something that isn't specified in the HTTP/3 protocol, such as eliciting a >> datagram flow or bi/unidirectional stream from the server. This is what is >> contemplated in several of the "Live Event" use cases, where the HTTP/3 >> Request/Response would be requesting the desired Event. The major advantage >> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >> stalls. So developers understand the value that support for datagrams and >> server-initiated streams can provide - the question is whether they'll have >> all the interoperable pieces in place to deploy it. >> >> Just because a generic HTTP/3 server supports QUIC and WebTransport, >> doesn't mean that it will support these use cases. I've been asked whether >> better interoperability and wider ecosystem support could be achieved by >> extending HTTP/3 in a way more in keeping with the existing protocol design >> - such as by allowing an HTTP/3 Request to specify a resource to be >> returned in a flow of datagrams. >> >> The situation might be more tenable if the node.js framework had HTTP/3 >> and QUIC modules on the horizon. >> >> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi >> wrote: >> >>> >>> >>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba >>> wrote: >>> >>>> Luke said: >>>> >>>> "My primary concern is that Http3Transport requires non-generic >>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>> worried that this will limit support for Http3Transport and complicates any >>>> HTTP/3 implementation that does support it." >>>> >>>> [BA] I have also heard this concern from developers. The concerns >>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>> WebTransport. This does enable some interesting use cases, such as a >>>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>>> or initiating bi-directional or uni-directional streams. So there is >>>> perceived value, but the question is whether that value will be widely >>>> supported across the HTTP/3 ecosystem. >>>> >>>> At this point, most generic HTTP/3 servers are not expected to support >>>> HTTP/3 datagrams (not part of the HTTP/3 protocol) or Http3Transport >>>> (perceived as a niche protocol), so that pooling would only be possible >>>> when using a framework. node.js will not have QUIC support for 12-18 >>>> months (held up by OpenSSL) so even framework support is expected to be >>>> limited. >>>> >>> >>> Where does this come from? A lot of QUIC servers are implementing QUIC >>> datagrams, and once you have those the delta with h3 datagrams is >>> negligible. Additionally, multiple h3 server implementers have indicated >>> they want to support WebTransport. It's starting to feel like the pushback >>> on HTTP3Transport is purely based on a perception of complexity from folks >>> who haven't tried to implement it? If that's the case, then we should get >>> some implementation experience to confirm or debunk that theory. >>> >>> >>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>> dschinazi.ietf@gmail.com> wrote: >>>> >>>>> >>>>> >>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley >>>>> wrote: >>>>> >>>>>> We're on the same page that there's code in HTTP/3 that could be >>>>>> leveraged for QuicTransport in the form of the header parsing. I think >>>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>> >>>>>> My primary concern is that Http3Transport requires non-generic >>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>> HTTP/3 implementation that does support it. >>>>>> >>>>> >>>>> Hi Luke, >>>>> >>>>> I'm curious, could you elaborate on what these "non-generic >>>>> modifications to the HTTP/3 layer" are please? >>>>> >>>>> Thanks, >>>>> David >>>>> >>>>> >>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>> >>>>>>> Hi Luke, >>>>>>> >>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, wrote: >>>>>>> >>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I really >>>>>>>> mean "QuicTransport has greater interoperability". You can take any QUIC >>>>>>>> implementation (+ datagram extension) and add a thin layer to support >>>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>> >>>>>>> >>>>>>> Thanks for the clarification. I appreciate the sentiment. But given >>>>>>> the development of QUIC its kind of surprising that people would find it >>>>>>> easier to identify an implementation that supports QUIC and datagram but >>>>>>> does not support HTTP/3. >>>>>>> >>>>>>> Thr situation for a more clean-room implementation is different, I >>>>>>> agree. However, by the time you've done all the hard stuff with QUIC, a >>>>>>> very focused HTTP/3 layer ends up quite thin too. You can ignore dynamic >>>>>>> compression, server push and extensibility points. >>>>>>> >>>>>>> I also see the current design being the thin end of the wedge. The >>>>>>> proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>>> years of effort. >>>>>>> >>>>>>> Cheers >>>>>>> Lucas >>>>>>> >>>>>>> >>>>>>> >>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>> >>>>>>>>> Hi folks, >>>>>>>>> >>>>>>>>> To follow up on one thread of discussion during IETF 109. To over >>>>>>>>> simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>> >>>>>>>>> I'd like to push more on this, what is the measurable complexity >>>>>>>>> of HTTP/3 over QUIC plus a new application mapping that needs to be >>>>>>>>> defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>> >>>>>>>>> Victor mentioned his proposal for a unified header semantic across >>>>>>>>> all transports, this is >>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>> cross-protocol pooling? >>>>>>>>> >>>>>>>>> Cheers, >>>>>>>>> Lucas >>>>>>>>> -- >>>>>>>>> Webtransport mailing list >>>>>>>>> Webtransport@ietf.org >>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>> >>>>>>>> -- >>>>>> Webtransport mailing list >>>>>> Webtransport@ietf.org >>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>> >>>>> -- >>>>> Webtransport mailing list >>>>> Webtransport@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>> >>>> -- >> Webtransport mailing list >> Webtransport@ietf.org >> https://www.ietf.org/mailman/listinfo/webtransport >> > --00000000000015ee6805b449b37c Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Ian said:=C2=A0

    "If people are int= ending to rely on pooling so an HTTP(hopefully H3) request can trigger a We= bTransport response, I think we're in a world of pain and over-optimiza= tion. This is more obvious in light of the fact that a WebTransport endpoin= t=C2=A0is likely not a generic CDN endpoint, as has been clearly stated by = Mark Nottingham.

    Bernard's comments above= point to a tighter coupling between HTTP/3 and WebTransport than I think i= s practical in production, unless I misunderstood(which I may have, it'= s been a long day)."

    [BA] The developers I ha= ve talked to (about the "event streaming" use case)=C2=A0have=C2= =A0exactly this concern - that a tight coupling between HTTP/3 and Http3Tra= nsport would be potentially brittle and non-interoperable. QuicTransport of= fers the same potential benefits (avoidance of HoL blocking, ability to mix= reliable request/response with datagrams), but because it is simpler there= are a wider range of tools available and interop risks seem lower. Only pe= rceived downside is the amount of cloud infrastructure (e.g. load balancing= , caching, etc.) they would need to build themselves.=C2=A0

    <= /div>
    "As I said at the mic, I don't see any reason YouTube wo= uld deploy a TCP based WebTransport given it will have to maintain an HTTP/= 1.1 option for basically forever and they've spent a good bit of effort= to make sure that works as well as it can."

    = [BA] I have heard similar things with respect to "fallback" from = developers. From their perspective, it is ideally=C2=A0something very solid= and widely deployed, not itself a new(er) technology.=C2=A0 Depending on t= he use case, the "fallback" was often the technology that they we= re already using, which they hoped that QuicTransport could eventually repl= ace.=C2=A0 But since=C2=A0the=C2=A0fallback technology was the current incu= mbent, there was little interest in introducing a new fallback technology (= HTTP/2) and a new incumbent (QuicTransport) at the same time. That was cons= idered to be unnecessary risk.=C2=A0

    On Mon, Nov 16, 2020 at 4:4= 5 PM Ian Swett <ianswett@google.c= om> wrote:
    I'm very concerned about any functionality th= at requires pooling.=C2=A0 Pooling is a client-specific optimization= and pooling policy is subject to change(within reason) at any time.=C2=A0 = If applications=C2=A0are saying "it'd be cool if we could share co= ngestion control and loss recovery state between H3 and WebTransport most o= f the time", then I can see there being real(albeit small) benefits, j= ust like there would be for putting DataChannels and RTP into one QUIC conn= ection for WebRTC.=C2=A0 If people are intending to rely on pooling so an H= TTP(hopefully H3) request can trigger a WebTransport response, I think we&#= 39;re in a world of pain and over-optimization.

    This is = more obvious in light of the fact that a WebTransport endpoint=C2=A0is like= ly not a generic CDN endpoint, as has been clearly stated by Mark Nottingha= m.

    Bernard's comments above point to a tighter c= oupling between HTTP/3 and WebTransport than I think is practical in produc= tion, unless I misunderstood(which I may have, it's been a long day).

    All of this makes me think we should punt the HTTP = based WebTransport options down the road a year or so and focus on QuicTran= sport=C2=A0initially.=C2=A0 It's not to say we won't do them, but t= hey're clearly more complex than=C2=A0QuicTransport=C2=A0and it'd b= e good to have real deployment experience prior to starting so we know what= the requirements are and where the dragons are lurking.=C2=A0 Also, the W3= C should design APIs that make it easy to detect failure to establish a QUI= C-based=C2=A0WebTransport, and this ensures those are well exercised.=C2=A0= Maybe we DO require pooling under certain conditions and describe those, b= ut there are likely privacy concerns under some circumstances and I'm n= ot enough of an expert to know what would be acceptable to all clients.

    Some=C2=A0people in the WG may think we have to relea= se a TCP based WebTransport at the same time as a QUIC based one, but I don= 't think that's true and even if we standardized them at the same t= ime, it doesn't mean both will achieve wide deployment at the same time= .=C2=A0 As I said at the mic, I don't see any reason YouTube would depl= oy a TCP based WebTransport given it will have to maintain an HTTP/1.1 opti= on for basically forever and they've spent a good bit of effort to make= sure that works as well as it can.=C2=A0 It's clear to me there are co= mpelling use cases right now for QuicTransport, but=C2=A0the driving use ca= ses for the fallback are not clear to me.=C2=A0 Consistency is intellectual= ly appealing, but doesn't drive deployments.

    =
    Ian

    On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba <bernard.aboba@gmail.c= om> wrote:
    David said:=C2=A0
    =
    "Where does this come from? A lot of QUIC servers are i= mplementing QUIC datagrams, and once you have those the delta with h3 datag= rams is negligible. Additionally, multiple h3 server implementers=C2=A0have= indicated they want to support WebTransport. It's starting to feel lik= e the pushback on HTTP3Transport=C2=A0is purely based on a perception of co= mplexity from folks who haven't tried to implement it? If that's th= e case, then we should get some implementation experience to confirm or deb= unk that theory."

    [BA] The pooling use cases = often involve an interaction between an HTTP/3 request/response and WebTran= sport.=C2=A0 so the HTTP/3 Request doesn't just elicit an HTTP/3 Respon= se.=C2=A0 It also causes something else to happen, something that isn't= specified in the HTTP/3 protocol, such as eliciting a datagram flow or bi/= unidirectional stream from the server.=C2=A0 This is what is contemplated i= n several of the "Live Event" use cases, where the HTTP/3 Request= /Response would be requesting the desired Event. The major advantage over H= LS is avoiding Head-of-Line blocking, reducing video freezes and stalls.=C2= =A0 So developers understand the value that support for datagrams and serve= r-initiated streams can provide - the question is whether they'll have = all the interoperable pieces in place to deploy it.=C2=A0

    Just because a generic HTTP/3 server supports QUIC and WebTranspor= t, doesn't mean that it will support these use cases.=C2=A0 I've be= en asked whether better interoperability and wider ecosystem support could = be achieved by extending HTTP/3 in a way more in keeping with the existing = protocol design - such as by allowing an HTTP/3 Request to specify a resour= ce to be returned in a flow of datagrams.=C2=A0

    Th= e situation might be more tenable if the node.js framework had HTTP/3 and Q= UIC modules on the horizon.

    On Mon, Nov 16, 2020 at 1:= 00 PM David Schinazi <dschinazi.ietf@gmail.com> wrote:

    <= /div>
    O= n Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba <bernard.aboba@gmail.com> wrote:<= br>
    Luke said:=C2=A0

    "My primary concern is that Http3Transport requires non-generic modificat= ions to the HTTP/3 layer mostly to support connection pooling. I'm worr= ied that this will limit support for Http3Transport and complicates any HTT= P/3 implementation that does support it."

    <= div>[BA] I have also heard this concern from developers. The concerns prima= rily arise from the pooling of HTTP/3 Request/Responses with WebTransport. = This does enable some interesting use cases, such as a Request/Response (e.= g. gRPC) that can result in a server sending datagrams or initiating bi-dir= ectional or uni-directional streams.=C2=A0 So there is perceived value, but= the question is whether that value will be widely supported across the HTT= P/3 ecosystem.=C2=A0

    At this point, most generic H= TTP/3 servers are not expected to support HTTP/3 datagrams (not part of the= HTTP/3 protocol) or Http3Transport (perceived as a niche protocol), so tha= t pooling would only be possible when using a framework.=C2=A0 node.js will= not have=C2=A0QUIC support for 12-18 months (held up by OpenSSL) so even f= ramework support is expected to be limited.
    Where does this come from? A lot of QUIC servers are implement= ing QUIC datagrams, and once you have those the delta with h3 datagrams is = negligible. Additionally, multiple h3 server implementers=C2=A0have indicat= ed they want to support WebTransport. It's starting to feel like the pu= shback on HTTP3Transport=C2=A0is purely based on a perception of complexity= from folks who haven't tried to implement it? If that's the case, = then we should get some implementation experience to confirm or debunk that= theory.
    =C2=A0
    On M= on, Nov 16, 2020 at 11:37 AM David Schinazi <dschinazi.ietf@gmail.com> wrote:<= br>


    On Mon, Nov 16, 2020 at 11:34 AM Luke Curley <kixelated@gmail.com> wrote:
    We're on the same page that there's code in HTTP/3 th= at could be leveraged for QuicTransport in the form of the header parsing. = I think there's a path to merge QuicTransport and Http3Transport by lev= eraging HTTP/3 for the handshake and QUIC for stream delivery.

    My primary concern is that Http3Transport requires non-generic modif= ications to the HTTP/3 layer mostly to support connection pooling. I'm = worried that this will limit support for Http3Transport and complicates any= HTTP/3 implementation that does support it.


    =C2=A0
    On Mon, Nov 16, 2020= at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com> wrote:
    Hi Luke,=

    On Mon, 16 Nov 2020, 12:26 Luke Curley, <= kixelated@gmail.co= m> wrote:
    Just to clarify, when I say "QuicTransport is s= impler" I really mean "QuicTransport has greater interoperability= ". You can take any QUIC implementation (+ datagram extension) and add= a thin layer to support QuicTransport. It's a nice layering of protoco= ls and it's something that I want to see in general as QUIC replaces TC= P.

    Thanks for the clarification. I appreciate the sentiment. But giv= en the development of QUIC its kind of surprising that people would find it= easier to identify an implementation that supports QUIC and datagram but d= oes not support HTTP/3.

    = Thr situation for a more clean-room implementation is different, I agree. H= owever, by the time you've done all the hard stuff with QUIC, a very fo= cused HTTP/3 layer ends up quite thin too. You can ignore dynamic compressi= on, server push and extensibility points.

    =
    I also see the current design being the thin end of the w= edge. The proposal I linked talks about HTTP-like header parsing. So its &q= uot;just" a thin layer to do some parsing. Then folks will probably wa= nt some want to tweak parameter, acontrol channel, a way to do graceful clo= se, a sprinkle of GREASE. To extrapolate forward, what would be the delta b= e between some final product QuicTransport and HTTP/3. Too small a delta an= d we've wasted years of effort.

    Cheers
    Lucas

    =


    On Mon, Nov 16= , 2020 at 3:16 AM Lucas Pardue <lucaspardue.24.7@gmail.com&g= t; wrote:
    Hi folks,

    To follow up on one thre= ad of discussion during IETF 109. To over simplify what we've heard a f= ew folks say, they prefer QuicTransport because it simpler and they don'= ;t need pooling.

    I'd like to push more on this= , what is the measurable complexity of HTTP/3 over QUIC plus a new applicat= ion mapping that needs to be defined? Let's isolate pooling as a variab= le and ignore it.

    Victor mentioned his proposal fo= r a unified header semantic across all transports, this is https://github.com/ietf-wg-webtrans/dra= ft-ietf-webtrans-overview/pull/4/files. Taking a closer look at it, I h= ave some concerns that I added as comments. HTTP has semantics for a reaso= n. If QuicTransport is going to start borrowing HTTP piecemeal, I really wo= nder how simple people might feel it is. I think it's important to avoi= d something that looks like HTTP but behaves differently. Is it really much= of a stretch to just do HTTP/3 but give it a different ALPN so that we avo= id problems related to cross-protocol pooling?

    Che= ers,
    Lucas
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    --00000000000015ee6805b449b37c-- From nobody Tue Nov 17 01:31:34 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5C8523A0D7C for ; Tue, 17 Nov 2020 01:31:32 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.847 X-Spam-Level: X-Spam-Status: No, score=-1.847 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5pcFizOhjJQd for ; Tue, 17 Nov 2020 01:31:27 -0800 (PST) Received: from mail-ej1-x62e.google.com (mail-ej1-x62e.google.com [IPv6:2a00:1450:4864:20::62e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 436253A0D73 for ; Tue, 17 Nov 2020 01:31:27 -0800 (PST) Received: by mail-ej1-x62e.google.com with SMTP id 7so28447559ejm.0 for ; Tue, 17 Nov 2020 01:31:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=6UmXAIAaLkcvdGuWUhQgli1p07vg9nLhlx9mKqyd2M8=; b=Uy1G0THemrBhRNRf4+Zq3g3J6773oChqoZVg8gZJzH6QoHvLXOdRSM3h/6ss01QquZ 1LZKXMTF5SuCBVibmle87u+EiFtNlqEnWYzTCvK/rx/3AisTtYfIa9lhF0VURo6U6zUJ R0pWEn4kkI6KpCgIX++n151szR8/iJ72MO4Dg9daQjP+qyvDx8VTAOg+yDI/3yB2xU9Z ECRA+CI7I7V1oltYv0gi94O3nDYl2DUNHFhEJ8GNhjYqmWwNszNjtwb8Dk20UVyOeMfk QJ2DkPmAoF/mcl0TVRt6wrss1ELzKn1lr9uZm8ERSyTlbjIwfZNDfraaF3oeq9Pakzaf wizA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=6UmXAIAaLkcvdGuWUhQgli1p07vg9nLhlx9mKqyd2M8=; b=Ln3N3fdzCayqfjaSWXohMmnEWeIPvWfqmUoM3iD3L2gG37CQkbbPkU816sRRRX2Nxx H9CHIZZ/7yL5SvJKEVgzEQuwWTKFPLLOxXA2FMPyBquU+zCthuqLNYgH+A5Q8n4pzj2v jsuh4O8yr/zD+k1eco7cK55ETvKqPuGkkN9R61uZ08a/WHnAqrAXDwAb0NHilx+3zAiI BeUUzLDoxT8BDV+ypmbvVLQld+zcswL6S0wOiWLMp8P29RW1vYVMgENjs7bdQkOoPLIJ NWhDSXj3DdOeKcgP+sKf8tdUfxA/10QJpWnABi8hrAnZRqo5LQJOy52glaLu5Q8Bevi2 xcoQ== X-Gm-Message-State: AOAM5333UfojsluvUthaJKKbKfNMQR5XIKas/9EoZfwlzvEBvi8MHESA CpJeFtUJGjferJI6xwXTcl9OcsAjqj5Dc/tfbZo= X-Google-Smtp-Source: ABdhPJyCrHRJyzjiw1lSNnXzGhLjlofuzeUt/6qbzmpfef6tE5oFlUte4L1mqR7hzubvEEnOqjUusYTw8ru2nxNG1AQ= X-Received: by 2002:a17:906:4c99:: with SMTP id q25mr19490349eju.67.1605605485542; Tue, 17 Nov 2020 01:31:25 -0800 (PST) MIME-Version: 1.0 References: In-Reply-To: From: Lucas Pardue Date: Tue, 17 Nov 2020 09:31:13 +0000 Message-ID: To: Luke Curley Cc: David Schinazi , Ian Swett , Bernard Aboba , WebTransport Content-Type: multipart/alternative; boundary="0000000000009d82c705b44a28a8" Archived-At: Subject: Re: [Webtransport] Measuring the friction of Http3Transport X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Nov 2020 09:31:32 -0000 --0000000000009d82c705b44a28a8 Content-Type: text/plain; charset="UTF-8" Hi Luke, On Tue, Nov 17, 2020 at 8:39 AM Luke Curley wrote: > Sorry, I didn't correctly understand your question until after I hit > send... I thought you were asking about HTTP/3 versus QuicTransport. > > QuicTransport can be supported at the application layer for an arbitrary* > QUIC library. For example, a kernel or hardware device could expose an > accelerated QUIC API (...we care a lot about performance). The simple > QuicTransport handshake would be done in user-space. > > Http3Transport, on the other hand, requires explicit support in an HTTP/3 > library. While it's not difficult to implement, explicit Http3Transport > support will be more limited than generic QUIC support. Native clients will > have fewer and potentially worse implementations to choose from. > > Again, I feel like this is only a minor benefit for QuicTransport. I'm > brand new to the IETF process and I may be overvaluing certain properties. > Using concrete specs, https://tools.ietf.org/html/draft-vvv-webtransport-quic-02 vs https://tools.ietf.org/html/draft-vvv-webtransport-http-02, the main difference I see is that Http3Transport has support for WebTransport (session) multiplexing in a single QUIC connection. It is not clear to me if session multiplexing is needed due to mixing with HTTP/3, or if it is intentionally extended behaviour over QuicTransport. I suggest that permitting only one session per QUIC connection would vastly simplify Http3Transport. You can even drop the special WEBTRANSPORT_STREAM frames that squat on client bidi streams, and instead just require that streams are upgraded to WebTransport purpose using Connect (ala RFC 8441). Doing this means that changes needed to H3 libraries approaches zero; it aligns with the frontend changes that MASQUE is detailing, which came up during the interim call. As Luke highlighted in his Github issues, there are serious footguns in the API; mixing WebTransports onto a single QUIC connection in a non-transparent way is like have two guns pointing at you and your buddies feet. The suggestion that pooling can be avoided by using different hosts endangers that becoming the only KISS deployment option if devs care about determinism. So why take on board the complexity even to start with? Cheers Lucas > > * Datagrams are currently required for QuicTransport, although it's a very > generic extension and could even be optional. > > On Mon, Nov 16, 2020 at 11:40 PM David Schinazi > wrote: > >> >> On Mon, Nov 16, 2020 at 11:35 PM Luke Curley wrote: >> >>> Hey David, I gave a quick presentation on my use-case yesterday. We're >>> using HLS so all media delivery is currently HTTP-based and we would love >>> to use HTTP/3. >>> >> >> And it was a great presentation! Your use case makes sense to me. >> >> >>> However, reducing latency requires a tighter feedback loop and some form >>> of push. The HTTP request/response model just complicates >>> things, especially when HTTP push is brought into the equation. >>> QuicTransport is much simpler and allows us to build something closer to >>> RTMP on top. >>> >> >> I don't understand this, can you clarify? What does the HTTP >> request/response model have to do with the Http3Transport vs QuicTransport >> question? >> >> >>> It also means that we can use the same protocol for both distribution >>> and contribution. >>> >> >> I apologize, but I don't understand this either. What same protocol? >> >> On Mon, Nov 16, 2020 at 9:29 PM David Schinazi >>> wrote: >>> >>>> >>>> >>>> On Mon, Nov 16, 2020 at 6:02 PM Luke Curley >>>> wrote: >>>> >>>>> I think that's a good starting summary David. Some things worth >>>>> mentioning: >>>>> >>>>> For 1 and 4, Twitch is using QuicTransport for both native >>>>> applications (ex. mobile, desktop, devices) and web applications. It's >>>>> minor, but we benefit from the ability to use any QUIC library (technically >>>>> we don't implement datagrams...) instead only those with HTTP/3 and >>>>> Http3Transport support. I think this context was missing in the previous >>>>> discussions. >>>>> >>>> >>>> Can you clarify which implementations you were considering that support >>>> QUIC+DATAGRAM but not HTTP/3? >>>> >>>> >>>>> For 3, QuicTransport can support 0-RTT if we declare the path/origin >>>>> handshake to be idempotent >>>>> ... unless the new >>>>> connection is routed to a different host. Both pooled Http3Transport and a >>>>> new QuicTransport connection could take the same number of round trips. >>>>> >>>> >>>> 0-RTT state isn't saved across ALPNs, even if it's to the same host. So >>>> Http3Transport would get inline 0-RTT but QuicTransport would not get 0-RTT >>>> unless you've already performed a QuicTransport handshake in recent history. >>>> >>>> >>>>> For 4 and 5, I'm worried about flow control >>>>> . tl;dr a >>>>> Http3Transport session could easily exhaust flow control limits for the >>>>> entire connection. This seems especially negative if pooling is performed >>>>> transparently (ex. a Http3Transport session may silently break HTTP/3 or >>>>> other sessions). >>>>> >>>> >>>> Unintentionally hitting the connection-level flow control limit is a >>>> serious implementation bug. I wouldn't expect this to still be a problem >>>> once implementations mature. I wouldn't want to base our protocol choices >>>> based on a bug in non-production-ready implementations. >>>> >>>> >>>>> On Mon, Nov 16, 2020 at 5:10 PM David Schinazi < >>>>> dschinazi.ietf@gmail.com> wrote: >>>>> >>>>>> I'd like us to take a step back, I think we're conflating many >>>>>> different topics here, and it's making it impossible to reason about this >>>>>> (at least for someone running on not enough sleep like I am this week). >>>>>> >>>>>> Topic 1: the complexity of implementing Http3Transport as opposed to >>>>>> QuicTransport on the client >>>>>> From my perspective, all browsers interested in WebTransport are >>>>>> implementing HTTP/3, so I don't see much complexity there. >>>>>> Please reply here if you know of complexities I'm not seeing >>>>>> >>>>>> Topic 2: the complexity of implementing Http3Transport as opposed to >>>>>> QuicTransport on the server >>>>>> As far as I know, most server-side QUIC stacks also support >>>>>> HTTP/3, and for QuicTransport they already have DATAGRAM support so I think >>>>>> the delta is negligible. >>>>>> Please reply here if you know of complexities I'm not seeing >>>>>> >>>>>> Topic 3: the benefits of pooling WebTransport >>>>>> This allows saving round trips to get WebTransport up and running >>>>>> This allows sharing congestion control state >>>>>> This allows letting the QUIC implementation prioritize DATAGRAMs >>>>>> vs HTTP requests instead of relying on the kernel or routers which have >>>>>> less information >>>>>> Overall, I think pooling is beneficial (though not an absolute >>>>>> must-have) >>>>>> Please reply here if you know of benefits I'm not seeing >>>>>> >>>>>> Topic 4: the difficulty of pooling Http3Transport on the client >>>>>> It appears that all browsers that are interested in WebTransport >>>>>> are implementing pooling in their HTTP/3 stack so additionally pooling >>>>>> WebTransport should not introduce more complexity >>>>>> Please reply here if you know of complexities I'm not seeing >>>>>> >>>>>> Topic 5: the difficulty of pooling Http3Transport on the server >>>>>> This one is trickier. If you have frontends that know how to >>>>>> route HTTP requests to backends, DATAGRAM support is going to be a whole >>>>>> new world. >>>>>> However, and I think this is really important: implementing this >>>>>> on the server is OPTIONAL. >>>>>> The server can easily use a different hostname (and different TLS >>>>>> certificates) for HTTP vs WebTransport and clients will not pool the two >>>>>> together. >>>>>> Once you use different domain names per WebTransport object, >>>>>> Http3Transport has the exact same pooling properties as QuicTransport. >>>>>> Please reply here if you know of complexities I'm not seeing >>>>>> >>>>>> What am I missing? >>>>>> >>>>>> Thanks, >>>>>> David >>>>>> >>>>>> >>>>>> On Mon, Nov 16, 2020 at 4:45 PM Ian Swett >>>>>> wrote: >>>>>> >>>>>>> I'm *very* concerned about any functionality that *requires* >>>>>>> pooling. Pooling is a client-specific optimization and pooling policy is >>>>>>> subject to change(within reason) at any time. If applications are saying >>>>>>> "it'd be cool if we could share congestion control and loss recovery state >>>>>>> between H3 and WebTransport most of the time", then I can see there being >>>>>>> real(albeit small) benefits, just like there would be for putting >>>>>>> DataChannels and RTP into one QUIC connection for WebRTC. If people are >>>>>>> intending to rely on pooling so an HTTP(hopefully H3) request can trigger a >>>>>>> WebTransport response, I think we're in a world of pain and >>>>>>> over-optimization. >>>>>>> >>>>>>> This is more obvious in light of the fact that a WebTransport >>>>>>> endpoint is likely not a generic CDN endpoint, as has been clearly stated >>>>>>> by Mark Nottingham. >>>>>>> >>>>>>> Bernard's comments above point to a tighter coupling between HTTP/3 >>>>>>> and WebTransport than I think is practical in production, unless I >>>>>>> misunderstood(which I may have, it's been a long day). >>>>>>> >>>>>>> All of this makes me think we should punt the HTTP based >>>>>>> WebTransport options down the road a year or so and focus on >>>>>>> QuicTransport initially. It's not to say we won't do them, but they're >>>>>>> clearly more complex than QuicTransport and it'd be good to have real >>>>>>> deployment experience prior to starting so we know what the requirements >>>>>>> are and where the dragons are lurking. Also, the W3C should design APIs >>>>>>> that make it easy to detect failure to establish a QUIC-based WebTransport, >>>>>>> and this ensures those are well exercised. Maybe we DO require pooling >>>>>>> under certain conditions and describe those, but there are likely privacy >>>>>>> concerns under some circumstances and I'm not enough of an expert to know >>>>>>> what would be acceptable to all clients. >>>>>>> >>>>>>> Some people in the WG may think we have to release a TCP based >>>>>>> WebTransport at the same time as a QUIC based one, but I don't think that's >>>>>>> true and even if we standardized them at the same time, it doesn't mean >>>>>>> both will achieve wide deployment at the same time. As I said at the mic, >>>>>>> I don't see any reason YouTube would deploy a TCP based WebTransport given >>>>>>> it will have to maintain an HTTP/1.1 option for basically forever and >>>>>>> they've spent a good bit of effort to make sure that works as well as it >>>>>>> can. It's clear to me there are compelling use cases right now for >>>>>>> QuicTransport, but the driving use cases for the fallback are not clear to >>>>>>> me. Consistency is intellectually appealing, but doesn't drive deployments. >>>>>>> >>>>>>> Ian >>>>>>> >>>>>>> On Mon, Nov 16, 2020 at 6:36 PM Bernard Aboba < >>>>>>> bernard.aboba@gmail.com> wrote: >>>>>>> >>>>>>>> David said: >>>>>>>> >>>>>>>> "Where does this come from? A lot of QUIC servers are implementing >>>>>>>> QUIC datagrams, and once you have those the delta with h3 datagrams is >>>>>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>>>>> who haven't tried to implement it? If that's the case, then we should get >>>>>>>> some implementation experience to confirm or debunk that theory." >>>>>>>> >>>>>>>> [BA] The pooling use cases often involve an interaction between an >>>>>>>> HTTP/3 request/response and WebTransport. so the HTTP/3 Request doesn't >>>>>>>> just elicit an HTTP/3 Response. It also causes something else to happen, >>>>>>>> something that isn't specified in the HTTP/3 protocol, such as eliciting a >>>>>>>> datagram flow or bi/unidirectional stream from the server. This is what is >>>>>>>> contemplated in several of the "Live Event" use cases, where the HTTP/3 >>>>>>>> Request/Response would be requesting the desired Event. The major advantage >>>>>>>> over HLS is avoiding Head-of-Line blocking, reducing video freezes and >>>>>>>> stalls. So developers understand the value that support for datagrams and >>>>>>>> server-initiated streams can provide - the question is whether they'll have >>>>>>>> all the interoperable pieces in place to deploy it. >>>>>>>> >>>>>>>> Just because a generic HTTP/3 server supports QUIC and >>>>>>>> WebTransport, doesn't mean that it will support these use cases. I've been >>>>>>>> asked whether better interoperability and wider ecosystem support could be >>>>>>>> achieved by extending HTTP/3 in a way more in keeping with the existing >>>>>>>> protocol design - such as by allowing an HTTP/3 Request to specify a >>>>>>>> resource to be returned in a flow of datagrams. >>>>>>>> >>>>>>>> The situation might be more tenable if the node.js framework had >>>>>>>> HTTP/3 and QUIC modules on the horizon. >>>>>>>> >>>>>>>> On Mon, Nov 16, 2020 at 1:00 PM David Schinazi < >>>>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba < >>>>>>>>> bernard.aboba@gmail.com> wrote: >>>>>>>>> >>>>>>>>>> Luke said: >>>>>>>>>> >>>>>>>>>> "My primary concern is that Http3Transport requires non-generic >>>>>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>>>>> HTTP/3 implementation that does support it." >>>>>>>>>> >>>>>>>>>> [BA] I have also heard this concern from developers. The concerns >>>>>>>>>> primarily arise from the pooling of HTTP/3 Request/Responses with >>>>>>>>>> WebTransport. This does enable some interesting use cases, such as a >>>>>>>>>> Request/Response (e.g. gRPC) that can result in a server sending datagrams >>>>>>>>>> or initiating bi-directional or uni-directional streams. So there is >>>>>>>>>> perceived value, but the question is whether that value will be widely >>>>>>>>>> supported across the HTTP/3 ecosystem. >>>>>>>>>> >>>>>>>>>> At this point, most generic HTTP/3 servers are not expected to >>>>>>>>>> support HTTP/3 datagrams (not part of the HTTP/3 protocol) or >>>>>>>>>> Http3Transport (perceived as a niche protocol), so that pooling would only >>>>>>>>>> be possible when using a framework. node.js will not have QUIC support for >>>>>>>>>> 12-18 months (held up by OpenSSL) so even framework support is expected to >>>>>>>>>> be limited. >>>>>>>>>> >>>>>>>>> >>>>>>>>> Where does this come from? A lot of QUIC servers are implementing >>>>>>>>> QUIC datagrams, and once you have those the delta with h3 datagrams is >>>>>>>>> negligible. Additionally, multiple h3 server implementers have indicated >>>>>>>>> they want to support WebTransport. It's starting to feel like the pushback >>>>>>>>> on HTTP3Transport is purely based on a perception of complexity from folks >>>>>>>>> who haven't tried to implement it? If that's the case, then we should get >>>>>>>>> some implementation experience to confirm or debunk that theory. >>>>>>>>> >>>>>>>>> >>>>>>>>>> On Mon, Nov 16, 2020 at 11:37 AM David Schinazi < >>>>>>>>>> dschinazi.ietf@gmail.com> wrote: >>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Mon, Nov 16, 2020 at 11:34 AM Luke Curley < >>>>>>>>>>> kixelated@gmail.com> wrote: >>>>>>>>>>> >>>>>>>>>>>> We're on the same page that there's code in HTTP/3 that could >>>>>>>>>>>> be leveraged for QuicTransport in the form of the header parsing. I think >>>>>>>>>>>> there's a path to merge QuicTransport and Http3Transport by leveraging >>>>>>>>>>>> HTTP/3 for the handshake and QUIC for stream delivery. >>>>>>>>>>>> >>>>>>>>>>>> My primary concern is that Http3Transport requires non-generic >>>>>>>>>>>> modifications to the HTTP/3 layer mostly to support connection pooling. I'm >>>>>>>>>>>> worried that this will limit support for Http3Transport and complicates any >>>>>>>>>>>> HTTP/3 implementation that does support it. >>>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Hi Luke, >>>>>>>>>>> >>>>>>>>>>> I'm curious, could you elaborate on what these "non-generic >>>>>>>>>>> modifications to the HTTP/3 layer" are please? >>>>>>>>>>> >>>>>>>>>>> Thanks, >>>>>>>>>>> David >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>>> On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue < >>>>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> Hi Luke, >>>>>>>>>>>>> >>>>>>>>>>>>> On Mon, 16 Nov 2020, 12:26 Luke Curley, >>>>>>>>>>>>> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> Just to clarify, when I say "QuicTransport is simpler" I >>>>>>>>>>>>>> really mean "QuicTransport has greater interoperability". You can take any >>>>>>>>>>>>>> QUIC implementation (+ datagram extension) and add a thin layer to support >>>>>>>>>>>>>> QuicTransport. It's a nice layering of protocols and it's something that I >>>>>>>>>>>>>> want to see in general as QUIC replaces TCP. >>>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> Thanks for the clarification. I appreciate the sentiment. But >>>>>>>>>>>>> given the development of QUIC its kind of surprising that people would find >>>>>>>>>>>>> it easier to identify an implementation that supports QUIC and datagram but >>>>>>>>>>>>> does not support HTTP/3. >>>>>>>>>>>>> >>>>>>>>>>>>> Thr situation for a more clean-room implementation is >>>>>>>>>>>>> different, I agree. However, by the time you've done all the hard stuff >>>>>>>>>>>>> with QUIC, a very focused HTTP/3 layer ends up quite thin too. You can >>>>>>>>>>>>> ignore dynamic compression, server push and extensibility points. >>>>>>>>>>>>> >>>>>>>>>>>>> I also see the current design being the thin end of the wedge. >>>>>>>>>>>>> The proposal I linked talks about HTTP-like header parsing. So its "just" a >>>>>>>>>>>>> thin layer to do some parsing. Then folks will probably want some want to >>>>>>>>>>>>> tweak parameter, acontrol channel, a way to do graceful close, a sprinkle >>>>>>>>>>>>> of GREASE. To extrapolate forward, what would be the delta be between some >>>>>>>>>>>>> final product QuicTransport and HTTP/3. Too small a delta and we've wasted >>>>>>>>>>>>> years of effort. >>>>>>>>>>>>> >>>>>>>>>>>>> Cheers >>>>>>>>>>>>> Lucas >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>>> On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue < >>>>>>>>>>>>>> lucaspardue.24.7@gmail.com> wrote: >>>>>>>>>>>>>> >>>>>>>>>>>>>>> Hi folks, >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> To follow up on one thread of discussion during IETF 109. To >>>>>>>>>>>>>>> over simplify what we've heard a few folks say, they prefer QuicTransport >>>>>>>>>>>>>>> because it simpler and they don't need pooling. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> I'd like to push more on this, what is the measurable >>>>>>>>>>>>>>> complexity of HTTP/3 over QUIC plus a new application mapping that needs to >>>>>>>>>>>>>>> be defined? Let's isolate pooling as a variable and ignore it. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Victor mentioned his proposal for a unified header semantic >>>>>>>>>>>>>>> across all transports, this is >>>>>>>>>>>>>>> https://github.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. >>>>>>>>>>>>>>> Taking a closer look at it, I have some concerns that I added as comments. >>>>>>>>>>>>>>> HTTP has semantics for a reason. If QuicTransport is going to start >>>>>>>>>>>>>>> borrowing HTTP piecemeal, I really wonder how simple people might feel it >>>>>>>>>>>>>>> is. I think it's important to avoid something that looks like HTTP but >>>>>>>>>>>>>>> behaves differently. Is it really much of a stretch to just do HTTP/3 but >>>>>>>>>>>>>>> give it a different ALPN so that we avoid problems related to >>>>>>>>>>>>>>> cross-protocol pooling? >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Cheers, >>>>>>>>>>>>>>> Lucas >>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>> Webtransport mailing list >>>>>>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>>>>>> >>>>>>>>>>>>>> -- >>>>>>>>>>>> Webtransport mailing list >>>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>>> >>>>>>>>>>> -- >>>>>>>>>>> Webtransport mailing list >>>>>>>>>>> Webtransport@ietf.org >>>>>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>>>>> >>>>>>>>>> -- >>>>>>>> Webtransport mailing list >>>>>>>> Webtransport@ietf.org >>>>>>>> https://www.ietf.org/mailman/listinfo/webtransport >>>>>>>> >>>>>>> --0000000000009d82c705b44a28a8 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Hi Luke,

    On Tue, Nov 17, 2020 at 8:39 AM Luke Curl= ey <kixelated@gmail.com> w= rote:
    Sorry, I didn't correctly understand your question until after= I hit send... I thought you were asking about HTTP/3 versus QuicTransport.=

    QuicTransport can be supported at the application layer= for an arbitrary* QUIC library. For example, a kernel or hardware device c= ould expose an accelerated=C2=A0QUIC API (...we care a lot about performanc= e). The simple QuicTransport handshake would be done in user-space.

    Http3Transport, on the other hand, requires explicit supp= ort in an HTTP/3 library. While it's not difficult to implement, explic= it Http3Transport support will be more limited than generic QUIC support. N= ative clients will have fewer and potentially worse implementations to choo= se from.

    Again, I feel like this is only a minor b= enefit for QuicTransport. I'm brand new to the IETF process and I may b= e overvaluing certain properties.

    Using concrete specs, https://tools.ietf.org/html/draft-vvv-webtransport-qui= c-02 vs https://tools.ietf.org/html/draft-vvv-webtransport-http-02, the= main difference I see is that Http3Transport has support for WebTransport = (session) multiplexing in a single QUIC connection.

    It is not clear to me if session multiplexing is needed due to mixin= g with HTTP/3, or if it is intentionally extended behaviour over QuicTransp= ort. I suggest that permitting only one session per QUIC connection would v= astly simplify Http3Transport. You can even drop the special WEBTRANSPORT_S= TREAM frames that squat on client bidi streams, and instead just require th= at streams are upgraded to WebTransport purpose using Connect (ala RFC 8441= ). Doing this means that changes needed to H3 libraries approaches zero; it= aligns with the frontend changes that MASQUE is detailing, which came up d= uring the interim call.

    As Luke highlighted in his= Github issues, there are serious footguns in the API; mixing WebTransports= onto a single QUIC connection in a non-transparent way is like have two gu= ns pointing at you and your buddies feet. The suggestion that pooling can b= e avoided by using different hosts endangers that becoming the only KISS de= ployment option if devs care about determinism. So why take on board the co= mplexity even to start with?

    Cheers
    = Lucas




    * Datagrams are currently required for QuicTransport, although it's a= very generic extension and could even be optional.
    <= /div>
    O= n Mon, Nov 16, 2020 at 11:40 PM David Schinazi <dschinazi.ietf@gmail.com> wrot= e:

    On Mon, Nov 16, 2020 at 11:35 PM Luke Curley <kixelated@gmail.com= > wrote:
    Hey David, I gave a quick presentation on my use-case yesterda= y. We're using HLS so=C2=A0all media delivery is currently HTTP-based a= nd we would love to use HTTP/3.=C2=A0

    And it was a great presentation! Your use case makes sense to me.
    =C2=A0
    However, reducing latency requires a tighter feedback loop and s= ome form of push. The HTTP request/response model just complicates things,= =C2=A0especially when HTTP push is brought into the equation. QuicTransport= is much simpler and allows us to build something closer to RTMP on top.

    I don't understand this, can = you clarify? What does the HTTP request/response model have to do with the = Http3Transport vs QuicTransport question?
    =C2=A0
    It also me= ans that we can use the same protocol for both distribution and contributio= n.

    I apologize, but = I don't understand this either. What same protocol?

    On Mon, Nov 16, 2020 at 9:29 PM Da= vid Schinazi <dschinazi.ietf@gmail.com> wrote:

    On Mon, N= ov 16, 2020 at 6:02 PM Luke Curley <kixelated@gmail.com> wrote:
    I think that's= a good starting summary David. Some things worth mentioning:

    For 1 and 4, Twitch is using QuicTransport for both native applicatio= ns (ex. mobile, desktop, devices) and web applications. It's minor, but= we benefit from the ability to use any QUIC library (technically we don= 9;t implement datagrams...) instead only those with HTTP/3 and Http3Transpo= rt support. I think this context was missing in the previous discussions.

    Can you clarify which implementa= tions you were considering that support QUIC+DATAGRAM but not HTTP/3?
    =
    =C2=A0
    For 3, QuicTransport can support 0-RTT if we declare the= path/origin handshake to be=C2=A0idempotent... unless the new connecti= on is routed to a different host. Both pooled Http3Transport and a new Quic= Transport connection could take the same number of round trips.
    =

    0-RTT state isn't saved across ALPNs, = even if it's to the same host. So Http3Transport=C2=A0would get inline = 0-RTT but QuicTransport would not get 0-RTT unless you've already perfo= rmed a QuicTransport handshake in recent history.
    =C2=A0
    For 4 = and 5, I'm worried about flow control. tl;dr a Http3Transport = session could easily exhaust flow control limits for the entire connection.= This seems especially negative if pooling is performed transparently (ex. = a Http3Transport session may silently break HTTP/3 or other sessions).

    Unintentionally hitting the connect= ion-level=C2=A0flow control limit is a serious implementation bug. I wouldn= 't expect this to still be a problem once implementations mature. I wou= ldn't want to base our protocol choices based on a bug in non-productio= n-ready implementations.
    =C2=A0
    On Mon, Nov 16, 2020 at 5:10 PM David Schinazi <dschinazi.ietf@gmail.com<= /a>> wrote:
    <= div dir=3D"ltr">I'd like us to take a step back, I think we're conf= lating many different topics here, and it's making it impossible to rea= son about this (at least for someone running on not enough sleep like I am = this week).

    Topic 1: the complexity of implementing=C2= =A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the client
    =
    =C2=A0 =C2=A0 From my perspective, all browsers interested in WebTrans= port are implementing HTTP/3, so I don't see much complexity there.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm = not seeing

    Topic 2: the complexity of impleme= nting=C2=A0Http3Transport=C2=A0as opposed to QuicTransport=C2=A0on the serv= er
    =C2=A0 =C2=A0 As far as I know, most server-side QUIC st= acks also support HTTP/3, and for QuicTransport=C2=A0they already have DATA= GRAM support so I think the delta is negligible.
    =C2=A0 =C2=A0 Pl= ease reply here if you know of complexities I'm not seeing

    Topic 3: the benefits of pooling WebTransport
    =
    =C2=A0 =C2=A0 This allows saving round trips to get WebTransport up an= d running
    =C2=A0 =C2=A0 This allows sharing congestion control st= ate
    =C2=A0 =C2=A0 This allows letting the QUIC implementation pri= oritize DATAGRAMs vs HTTP requests instead of relying on the kernel or rout= ers which have less information
    =C2=A0 =C2=A0 Overall, I think po= oling is beneficial (though not an absolute must-have)
    =C2=A0 =C2= =A0 Please reply here if you know of benefits I'm not seeing
    <= div>
    Topic 4: the difficulty of pooling Http3Transport=C2=A0o= n the client
    =C2=A0 =C2=A0 It appears that all browsers that are = interested in WebTransport are implementing pooling in their HTTP/3 stack s= o additionally pooling WebTransport should not introduce more complexity
    =C2=A0 =C2=A0 Please reply here if you know of complexities I'm= not seeing

    Topic 5: the difficult= y of pooling Http3Transport=C2=A0on the server
    =C2=A0 =C2= =A0 This one is trickier. If you have frontends that know how to route HTTP= =C2=A0requests to backends, DATAGRAM support is going to be a whole new wor= ld.
    =C2=A0 =C2=A0 However, and I think this is really important: = implementing this on the server is OPTIONAL.
    =C2=A0 =C2=A0 The se= rver can easily use a different hostname (and different TLS certificates) f= or HTTP vs WebTransport and clients will not pool the two together.
    =C2=A0 =C2=A0 Once you use different domain names per WebTransport objec= t, Http3Transport=C2=A0has the exact same pooling properties as QuicTranspo= rt.
    =C2=A0 =C2=A0 Please reply here if you know of complexities I= 'm not seeing

    What am I missing?

    Thanks,
    David


    On Mon, Nov 16,= 2020 at 4:45 PM Ian Swett <ianswett@google.com> wrote:
    I'm very conce= rned about any functionality that requires pooling.=C2=A0 Pooling is= a client-specific optimization and pooling policy is subject to change(wit= hin reason) at any time.=C2=A0 If applications=C2=A0are saying "it'= ;d be cool if we could share congestion control and loss recovery state bet= ween H3 and WebTransport most of the time", then I can see there being= real(albeit small) benefits, just like there would be for putting DataChan= nels and RTP into one QUIC connection for WebRTC.=C2=A0 If people are inten= ding to rely on pooling so an HTTP(hopefully H3) request can trigger a WebT= ransport response, I think we're in a world of pain and over-optimizati= on.

    This is more obvious in light of the fact that a Web= Transport endpoint=C2=A0is likely not a generic CDN endpoint, as has been c= learly stated by Mark Nottingham.

    Bernard's comm= ents above point to a tighter coupling between HTTP/3 and WebTransport than= I think is practical in production, unless I misunderstood(which I may hav= e, it's been a long day).

    All of this makes me= think we should punt the HTTP based WebTransport options down the road a y= ear or so and focus on QuicTransport=C2=A0initially.=C2=A0 It's not to = say we won't do them, but they're clearly more complex than=C2=A0Qu= icTransport=C2=A0and it'd be good to have real deployment experience pr= ior to starting so we know what the requirements are and where the dragons = are lurking.=C2=A0 Also, the W3C should design APIs that make it easy to de= tect failure to establish a QUIC-based=C2=A0WebTransport, and this ensures = those are well exercised.=C2=A0 Maybe we DO require pooling under certain c= onditions and describe those, but there are likely privacy concerns under s= ome circumstances and I'm not enough of an expert to know what would be= acceptable to all clients.

    Some=C2=A0people in th= e WG may think we have to release a TCP based WebTransport at the same time= as a QUIC based one, but I don't think that's true and even if we = standardized them at the same time, it doesn't mean both will achieve w= ide deployment at the same time.=C2=A0 As I said at the mic, I don't se= e any reason YouTube would deploy a TCP based WebTransport given it will ha= ve to maintain an HTTP/1.1 option for basically forever and they've spe= nt a good bit of effort to make sure that works as well as it can.=C2=A0 It= 's clear to me there are compelling use cases right now for QuicTranspo= rt, but=C2=A0the driving use cases for the fallback are not clear to me.=C2= =A0 Consistency is intellectually appealing, but doesn't drive deployme= nts.

    Ian

    On Mon, Nov 16, 2020 at 6:36 P= M Bernard Aboba <bernard.aboba@gmail.com> wrote:
    David said:=C2=A0

    "Where does this come from? = A lot of QUIC servers are implementing QUIC datagrams, and once you have th= ose the delta with h3 datagrams is negligible. Additionally, multiple h3 se= rver implementers=C2=A0have indicated they want to support WebTransport. It= 's starting to feel like the pushback on HTTP3Transport=C2=A0is purely = based on a perception of complexity from folks who haven't tried to imp= lement it? If that's the case, then we should get some implementation e= xperience to confirm or debunk that theory."

    = [BA] The pooling use cases often involve an interaction between an HTTP/3 r= equest/response and WebTransport.=C2=A0 so the HTTP/3 Request doesn't j= ust elicit an HTTP/3 Response.=C2=A0 It also causes something else to happe= n, something that isn't specified in the HTTP/3 protocol, such as elici= ting a datagram flow or bi/unidirectional stream from the server.=C2=A0 Thi= s is what is contemplated in several of the "Live Event" use case= s, where the HTTP/3 Request/Response would be requesting the desired Event.= The major advantage over HLS is avoiding Head-of-Line blocking, reducing v= ideo freezes and stalls.=C2=A0 So developers understand the value that supp= ort for datagrams and server-initiated streams can provide - the question i= s whether they'll have all the interoperable pieces in place to deploy = it.=C2=A0

    Just because a generic HTTP/3 server su= pports QUIC and WebTransport, doesn't mean that it will support these u= se cases.=C2=A0 I've been asked whether better interoperability and wid= er ecosystem support could be achieved by extending HTTP/3 in a way more in= keeping with the existing protocol design - such as by allowing an HTTP/3 = Request to specify a resource to be returned in a flow of datagrams.=C2=A0<= /div>

    The situation might be more tenable if the node.js= framework had HTTP/3 and QUIC modules on the horizon.

    On Mon, Nov 16, 2020 at 1:00 PM David Schinazi <dschinazi.ietf@gmail.com> wro= te:


    On Mon, Nov 16, 2020 at 12:40 PM Bernard Aboba &l= t;bernard.abob= a@gmail.com> wrote:
    Luke said:=C2=A0

    "My primary concern is that Http3Transport req= uires non-generic modifications to the HTTP/3 layer mostly to support conne= ction pooling. I'm worried that this will limit support for Http3Transp= ort and complicates any HTTP/3 implementation that does support it.&= quot;

    [BA] I have also heard this concern from dev= elopers. The concerns primarily arise from the pooling of HTTP/3 Request/Re= sponses with WebTransport. This does enable some interesting use cases, suc= h as a Request/Response (e.g. gRPC) that can result in a server sending dat= agrams or initiating bi-directional or uni-directional streams.=C2=A0 So th= ere is perceived value, but the question is whether that value will be wide= ly supported across the HTTP/3 ecosystem.=C2=A0

    At= this point, most generic HTTP/3 servers are not expected to support HTTP/3= datagrams (not part of the HTTP/3 protocol) or Http3Transport (perceived a= s a niche protocol), so that pooling would only be possible when using a fr= amework.=C2=A0 node.js will not have=C2=A0QUIC support for 12-18 months (he= ld up by OpenSSL) so even framework support is expected to be limited.

    Where does this come from? A lot of= QUIC servers are implementing QUIC datagrams, and once you have those the = delta with h3 datagrams is negligible. Additionally, multiple h3 server imp= lementers=C2=A0have indicated they want to support WebTransport. It's s= tarting to feel like the pushback on HTTP3Transport=C2=A0is purely based on= a perception of complexity from folks who haven't tried to implement i= t? If that's the case, then we should get some implementation experienc= e to confirm or debunk that theory.
    =C2=A0
    On Mon, Nov 16, 2020 at 11:37 AM David Schinazi <= dschinazi.iet= f@gmail.com> wrote:


    On Mon, Nov 16, 2020 at 11= :34 AM Luke Curley <kixelated@gmail.com> wrote:
    We're on the same page that th= ere's code in HTTP/3 that could be leveraged for QuicTransport in the f= orm of the header parsing. I think there's a path to merge QuicTranspor= t and Http3Transport by leveraging HTTP/3 for the handshake and QUIC for st= ream delivery.

    My primary concern is that Http3Transport= requires non-generic modifications to the HTTP/3 layer mostly to support c= onnection pooling. I'm worried that this will limit support for Http3Tr= ansport and complicates any HTTP/3 implementation that does support it.

    Hi Luke,

    = I'm curious, could you elaborate on what these "non-generic modifi= cations to the HTTP/3 layer" are please?

    Than= ks,
    David
    =C2=A0
    On Mon, Nov 16, 2020 at 4:49 AM Lucas Pardue <lucaspardue.24.7@gmail.com= > wrote:
    Hi Luke,

    On Mon, 16 Nov 20= 20, 12:26 Luke Curley, <kixelated@gmail.com> wrote:
    Just to clarify, when I s= ay "QuicTransport is simpler" I really mean "QuicTransport h= as greater interoperability". You can take any QUIC implementation (+ = datagram extension) and add a thin layer to support QuicTransport. It's= a nice layering of protocols and it's something that I want to see in = general as QUIC replaces TCP.

    Thanks for the clarification. I appre= ciate the sentiment. But given the development of QUIC its kind of surprisi= ng that people would find it easier to identify an implementation that supp= orts QUIC and datagram but does not support HTTP/3.
    =
    Thr situation for a more clean-room implementat= ion is different, I agree. However, by the time you've done all the har= d stuff with QUIC, a very focused HTTP/3 layer ends up quite thin too. You = can ignore dynamic compression, server push and extensibility points.
    =

    I also see the current design= being the thin end of the wedge. The proposal I linked talks about HTTP-li= ke header parsing. So its "just" a thin layer to do some parsing.= Then folks will probably want some want to tweak parameter, acontrol chann= el, a way to do graceful close, a sprinkle of GREASE. To extrapolate forwar= d, what would be the delta be between some final product QuicTransport and = HTTP/3. Too small a delta and we've wasted years of effort.

    Cheers
    Lucas=



    On Mon, Nov 16, 2020 at 3:16 AM Lucas Pardue <lu= caspardue.24.7@gmail.com> wrote:
    Hi folks,

    To follow up on one thread of discussion during IETF 109. To over sim= plify what we've heard a few folks say, they prefer QuicTransport becau= se it simpler and they don't need pooling.

    I&#= 39;d like to push more on this, what is the measurable complexity of HTTP/3= over QUIC plus a new application mapping that needs to be defined? Let'= ;s isolate pooling as a variable and ignore it.

    Vi= ctor mentioned his proposal for a unified header semantic across all transp= orts, this is https://g= ithub.com/ietf-wg-webtrans/draft-ietf-webtrans-overview/pull/4/files. T= aking a closer look at it, I have some concerns that I added as comments. = HTTP has semantics for a reason. If QuicTransport is going to start borrowi= ng HTTP piecemeal, I really wonder how simple people might feel it is. I th= ink it's important to avoid something that looks like HTTP but behaves = differently. Is it really much of a stretch to just do HTTP/3 but give it a= different ALPN so that we avoid problems related to cross-protocol pooling= ?

    Cheers,
    Lucas
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    Webtransport@iet= f.org
    https://www.ietf.org/mailman/listinfo/webtransport=
    --0000000000009d82c705b44a28a8-- From nobody Tue Nov 17 22:12:09 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4EA713A14E2 for ; Tue, 17 Nov 2020 22:12:02 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0YfvRRiMmkgg for ; Tue, 17 Nov 2020 22:12:00 -0800 (PST) Received: from mail-lj1-x22b.google.com (mail-lj1-x22b.google.com [IPv6:2a00:1450:4864:20::22b]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id F1E683A1511 for ; Tue, 17 Nov 2020 22:11:59 -0800 (PST) Received: by mail-lj1-x22b.google.com with SMTP id b17so1006990ljf.12 for ; Tue, 17 Nov 2020 22:11:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=HCr884uuyzeS8xY6PrnxjqZKDuIbDaVj6CjDYdBLtBs=; b=ZwFp2PdxQLELPsxGaz3NEMg2+3FZUAUCJWpmmcqEPSvKNq6gDl5W5WlMIJFQI9RIXa SOsJuEFHj5wHaRyTLJqNQEr0IP/90lBnK0bupMZw37ph2S2feDYAcRuGvknkyxUDTgNy 7aUHzXNWWcHMFtyhpMs31xkE5l2IyEwoI3aAFC1BeiIfqk6CMD72wn0io5MP/Oy75RYP QScqzbpd2nDsBNnDSjh+Lh8yuzXxHCPR8yte4e0PwHk/YHyR+DNfE/6/u/sw9v6JhQF/ RCrfNfXiyUA8Yx62L3S2inuMujKWi5yPULFoSSrna1oOpidK1OM/T4xygajeSMeLxOgS rvJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=HCr884uuyzeS8xY6PrnxjqZKDuIbDaVj6CjDYdBLtBs=; b=sPkttSx2GBzO9leN1LoDubCqMp+mYy0ChVhp2yJn5nr8xQW0tDdnZ5BCUvkQCb8hPJ IOVUg+k0nbS84iCNPfihdAmmvjMXTE5IFGJWdggDdZqTCWksrnBmRfwjEiYoGZhY9KZV xK29IodJK9+ZRKomXSE//zBRC7VKOm1ySOSAnnyTvcucsgdCA/6qtZpDT8wO1AipYZuD Zo2G10xBRhOS+llUQ0KqJbxhHo8qY3FN7jB3jj3CYiOlFFaN/tF6D0Q/wy0Ai/JIOw15 yzPoI0SC4hm6JztddLqFBsY2xRdlpnMsfcddKJ/9HKC/REgAqDC1Uo+KXKnI+RZUS7vo xq4A== X-Gm-Message-State: AOAM5324Oz66hIgnLTOGIqw7pi/hXNt7CViFaZTxSVa4mi3hfuWElwTI R1Vr+kl9dQlk8Fkb2ADqXm1h3yWD1koLNKh8+Dhf+wuT1KaBJg== X-Google-Smtp-Source: ABdhPJzU2Xp/EZtSiB5OxbHQJpwmNbvqXxzfXe9E9pTYQSA9LJAJG0nwI/1ibO2F5DlB3Vv+QxL7qWO6ioTxdWyfu5s= X-Received: by 2002:a2e:b1c9:: with SMTP id e9mr2274110lja.283.1605679918011; Tue, 17 Nov 2020 22:11:58 -0800 (PST) MIME-Version: 1.0 From: Bernard Aboba Date: Tue, 17 Nov 2020 22:11:47 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="00000000000022da2205b45b7de7" Archived-At: Subject: [Webtransport] Doodle Poll for Virtual Interim X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 06:12:09 -0000 --00000000000022da2205b45b7de7 Content-Type: text/plain; charset="UTF-8" At the IETF 109 WEBTRANS WG, we discussed scheduling a virtual interim to make more rapid progress on (among other things) The Transport Zoo. Here is a Doodle Poll for potential days/times during the second week of January, 2021: https://www.doodle.com/poll/38qv9hdazfrxsi7u Please respond to the Doodle Poll by Friday, November 27, 2020. --00000000000022da2205b45b7de7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    At the IETF 109 WEBTRANS WG, we discussed scheduling a vir= tual interim to make more rapid progress on (among other things) The Transp= ort Zoo.=C2=A0

    Here is a Doodle Poll for potential days/= times during the second week of January, 2021:=C2=A0

    Please respon= d to the Doodle Poll by Friday, November 27, 2020.=C2=A0
    --00000000000022da2205b45b7de7-- From nobody Tue Nov 17 23:42:09 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 16E033A0CE8 for ; Tue, 17 Nov 2020 23:42:08 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9Iv_VMQvx93c for ; Tue, 17 Nov 2020 23:42:06 -0800 (PST) Received: from mail-lj1-x22f.google.com (mail-lj1-x22f.google.com [IPv6:2a00:1450:4864:20::22f]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7DAD23A0CE7 for ; Tue, 17 Nov 2020 23:42:06 -0800 (PST) Received: by mail-lj1-x22f.google.com with SMTP id l10so1265781lji.4 for ; Tue, 17 Nov 2020 23:42:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=YbOnyQJ1gNvrT2OUD1e592hHVXbu04/PIFpseUw/upk=; b=bExzvhtw1l89OtcnOABGPUOBPL/iBOSpeN9v3LRIuN5skTt16g1oj2igMtOwwyO9hj M/DitnHSXjLIjmGuCxOaBgCt9rX+MFyQ+1y1fqaQHy9rHnAWYp7/dHhHj2heYdcFeYs9 Y8Ul+ATtnPhpCDaB4yy11ArIZtMwYQ4tzJF09sHiakmlZV/HVqTaP73ik62FspDFVmaB rwbIz/k8hV6FK0mD7EJyR53idYhSxgEIfe8AzbT7XNPilJN6BCFMqgFw4k2faotVIuhE G6PtMSRqekRiN5bd1ATUjwWcI2jUcasOuBtQMDmO4iu9ZObcraXewfNo14yO7Zh/2AWg Ifhg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=YbOnyQJ1gNvrT2OUD1e592hHVXbu04/PIFpseUw/upk=; b=IufwTNpEYkBmuYJ1mEH7S2lb/uNm+bOHMCw2e+n/rDcEk46OeZt7KQ3a708rWFONJB 1kOb1pIekzT+ZZLQ+FZUl14pmsyXOUSQMU9iNqZPmchMmXz7bthU37yDM2IisNPNyEbO 8/Ri/YNM+F6Y3imi8By8xVZHL53j5yfRxE2GDex4rEL4K1dNGqRTpasWmLJGGGyDwuvj XTL4Gvr/TLXz3JfKt7KiU3bgPOB3l7HJfgDrpYGq/1HpTiosvoFhsq+37psIyC4msgBu FkVxXexgB7XuFxXL79VVUEdGbqHsu5epzzKuzDwbRpd67DFNmR2T6osZg37e09QykcGI 4SAA== X-Gm-Message-State: AOAM5332RQCZgDsM6s2Ix2kjMijxbzB1IRKiMtHE3B/zMejUGWVGMNMi JQnkIbDfKnv4s8WO47lwzOtdFS2w4OSuBy0POJJSJ+2auwi+Pw== X-Google-Smtp-Source: ABdhPJwtuIwx2vUmgIQlOCOWy9GOtU8TvKpX5SsZP4Fe6Oi98Bruftv+9o+L8vIGwX5SbrLaHiKW88Pg60Q2vWJcVYs= X-Received: by 2002:a2e:9ecd:: with SMTP id h13mr3605503ljk.238.1605685323737; Tue, 17 Nov 2020 23:42:03 -0800 (PST) MIME-Version: 1.0 From: Bernard Aboba Date: Tue, 17 Nov 2020 23:41:52 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="00000000000057c6bb05b45cbf84" Archived-At: Subject: [Webtransport] IETF 109 WEBTRANS WG draft minutes X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 18 Nov 2020 07:42:08 -0000 --00000000000057c6bb05b45cbf84 Content-Type: text/plain; charset="UTF-8" Draft minutes of the IETF 109 WEBTRANS WG meeting are here: https://datatracker.ietf.org/doc/minutes-109-webtrans/ Thanks to the note takers! Please send any corrections to me. --00000000000057c6bb05b45cbf84 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    Draft minutes of the IETF 109 WEBTRANS WG meeting are here= :=C2=A0
    =C2=A0Thanks to the note takers!=C2=A0=C2=A0

    Please send any corrections to me.=C2=A0

    --00000000000057c6bb05b45cbf84-- From nobody Thu Nov 26 17:08:13 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 3F8843A0D4B for ; Thu, 26 Nov 2020 17:08:12 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id bGwPRT7nt0cs for ; Thu, 26 Nov 2020 17:08:11 -0800 (PST) Received: from mail-lf1-x136.google.com (mail-lf1-x136.google.com [IPv6:2a00:1450:4864:20::136]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id AAFD53A0D50 for ; Thu, 26 Nov 2020 17:08:10 -0800 (PST) Received: by mail-lf1-x136.google.com with SMTP id u19so4838830lfr.7 for ; Thu, 26 Nov 2020 17:08:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=OtzIyIftFSluPR9jIp+2KleAvmPOwtSEv3mjHQdn+8o=; b=dxoINaa8RvX6Xegft4LKkhQt96POXseCJJfoljNilqzg96CXjToIeWghbXexkNUvsg G1bovBkehUWzCl6xpMFWrNY9kGsBBlHi9yd9fTbV9Gq1f6wdZehQjPyp6bq2t3hASka5 IJi+vbvAo7DzzehoEsZmo9thiyO0Hc5erSZIdvyy09dcYrZ9FBb0csWzVGWharcp4RHg BsURpAvu6hSslu6LFLQZ8jZHcI6lycFBPeZG8y91S9C6dQVtaA6j/ZvjDK1FXXYYaukS yP6bko91ponSBpp070W1Yk14eHnL27klIqAfeTm737VYf3qku3iq5FPfQsZw0hZAqKYs G1jg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=OtzIyIftFSluPR9jIp+2KleAvmPOwtSEv3mjHQdn+8o=; b=mrPhcInN78ACuFd9ajXDkS45nf+vz6KgrJlvAiQwM2Q9zYo5l5gZJaijICyiCURTHO Un0m7e54Yj3jPAZfLn+F1FpYK/uw+cp/MI67GPspccViwsd5/NwVEQug0Pnp2zKb8yLe VR3qPCePIgxDN8msCIjLa1UfNDvrOT5hsSUlA9+VvYEQtfyy2p1vMLYTDeFMuw3yzzr1 90xwJVU4sFXKo2Z4fl+v9ExEzr07ALqIGZvDxTf3iDz4x4l+Lb5nD0Pp2aEzPVnxFljN ouZ5tArDOQHT78zgLLuucIm7D7hSJt0OvwieN3CrOAo9m9LoTv7rCcbF03wvq2wkC1Zf rbUw== X-Gm-Message-State: AOAM531ShOdVhsIHdzjATFXwqAhntHAVBIKQmjQGojHfb7baDKNDNelC 8dNnRQuHMCT2ZtkcCL2sU4KdeyHe9R1Xjy6pYu/fKBn4b86MvQ== X-Google-Smtp-Source: ABdhPJzfBI2bYia/EQ3ZSeV0NB5Pos7Hd7M7xzt8JnrZL2IMQcilZZ9j2z1clkhvrNAGf7oEkNtUKXOHFpb1HMMp9bg= X-Received: by 2002:a19:c658:: with SMTP id w85mr2190386lff.560.1606439288486; Thu, 26 Nov 2020 17:08:08 -0800 (PST) MIME-Version: 1.0 From: Bernard Aboba Date: Thu, 26 Nov 2020 17:08:01 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="00000000000024bf0a05b50c4ba3" Archived-At: Subject: [Webtransport] Reminder: Doodle Poll for Virtual Interim Date X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Nov 2020 01:08:12 -0000 --00000000000024bf0a05b50c4ba3 Content-Type: text/plain; charset="UTF-8" The Doodle Poll for the Virtual Interim of the WEBTRANS WG will close tomorrow. Please fill in your preferences here: https://doodle.com/poll/38qv9hdazfrxsi7u --00000000000024bf0a05b50c4ba3 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    The Doodle Poll for the Virtual Interim o= f the WEBTRANS WG will close tomorrow.=C2=A0 Please fill in your preference= s here:=C2=A0
    --00000000000024bf0a05b50c4ba3-- From nobody Sat Nov 28 19:45:05 2020 Return-Path: X-Original-To: webtransport@ietfa.amsl.com Delivered-To: webtransport@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4805F3A0FEB for ; Sat, 28 Nov 2020 19:45:03 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.098 X-Spam-Level: X-Spam-Status: No, score=-2.098 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id f1hjmdaghN1G for ; Sat, 28 Nov 2020 19:45:02 -0800 (PST) Received: from mail-lf1-x133.google.com (mail-lf1-x133.google.com [IPv6:2a00:1450:4864:20::133]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D87E13A0FE4 for ; Sat, 28 Nov 2020 19:45:01 -0800 (PST) Received: by mail-lf1-x133.google.com with SMTP id s30so13647086lfc.4 for ; Sat, 28 Nov 2020 19:45:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=VL/w4ikJt+K56iWbFr2JzLOjIc1+2i0kqMd0DyRR1tI=; b=LCUZfB5rSdges3xaUmfJVTIpuUfpt/j8b8y8ltwjgiZg11dyqlS4AeF+TaOwQHwBVd d1ZLBcVgjEAMoQfNOpQEiw3RtR5EC6ugL8OH24xiZqFu7oDAgbcAW6Se6LijQrOwg3bx WyX9CMTlwmyBYrb3yRvA3yW71LSJwDVITqJlmvIvlT3BnHJdxC3TCjZxrKhaWbQg7IiU exwP4zoDuj8LC8tRe9NrRr10jRAb1KE8ym8i5Z/bgCZGGkkCUHUsbCz22OKOfqSSTtbw hhU+CVaDN4uuaJOUOswNaPMqBTBE33MU4w01MRUeiiS97fv96SMHPN+IlY/65m4S2Dqb FAwA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=VL/w4ikJt+K56iWbFr2JzLOjIc1+2i0kqMd0DyRR1tI=; b=gGJ93m1culhHpuqOQun7oYi2sNcB9oTZwSgvZ3isL8Vcf61yOudwAfxNFJtTYmQ46l ZyhNEJF6vEyQOI01kNOHPbRKOS2RphBoShJCmg0n/FZQO0Pa22Yb9Dh6oSkughw1p8QP yWpqouIBUfTy0dlULUPaxdpgSKPna7xizIY7adWK3Qob5q3dUMPV65rOYFibewHnsg29 bGn15lZMdTaR+xkXaC/n6ZVE6U3LoCAxdM5d3WGo23toEtgUocHUFCfKKK0nkBruxE1q /H3U2VcavEKLBjyp97vzpEg+snH/P5c+vwzIGw9ui8JWZjmEII/LoRKBIbww1CkqO6Z0 Pa0Q== X-Gm-Message-State: AOAM533HzZ0YSaCPEu12I59gvNJEb4zvBgwO9z6AFunbcM8Ci4R5MCf2 rrfjLic9x6jyBJHtT3Cp5Mp7wMyykBN5KlRhV7Self/cyN8= X-Google-Smtp-Source: ABdhPJzkXtxXaAfICH7QNWZW72YsVAjSRCsdMAbnenAna7btVlGhJ4la3t4cdcMT6dnbC+AnhvvPrHtDIO6Dln3OYv4= X-Received: by 2002:ac2:4836:: with SMTP id 22mr6726602lft.41.1606621499834; Sat, 28 Nov 2020 19:44:59 -0800 (PST) MIME-Version: 1.0 From: Bernard Aboba Date: Sat, 28 Nov 2020 19:44:49 -0800 Message-ID: To: WebTransport Content-Type: multipart/alternative; boundary="000000000000c943ed05b536b730" Archived-At: Subject: [Webtransport] WebTransport Virtual Interim date/time X-BeenThere: webtransport@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 29 Nov 2020 03:45:03 -0000 --000000000000c943ed05b536b730 Content-Type: text/plain; charset="UTF-8" The IETF WEBTRANS WG will have its virtual interim on Tuesday, January 12, 2021 from 8:00 AM - 9:30 AM Pacific Time. We will announce the conference call parameters on the list. --000000000000c943ed05b536b730 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
    The IETF WEBTRANS WG will have its virtual interim on Tues= day, January 12, 2021 from 8:00 AM - 9:30 AM Pacific Time.=C2=A0

    We will announce the conference call parameters on the list.=C2=A0=
    --000000000000c943ed05b536b730--