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From: Mark Nottingham <mnot@mnot.net>
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Date: Tue, 5 Feb 2019 14:45:02 +1100
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To: Devin Mullins <twifkak=40google.com@dmarc.ietf.org>
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Subject: Re: [Ietf-message-headers] Requesting provisional registration for AMP-Cache-Transform header
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Hi Devin,

Sorry for the delay; I saw this a while ago but didn't look into it =
deeply. For future reference, you're much more likely to get reviews if =
you send this to the HTTP WG mailing list (we're in the process of =
separating HTTP headers out into their own registry, in part to make =
that more clear).

Without commenting on the entire document you link to, it says:

> Therefore, the need arises for the origin to distinguish requests from =
users and requests from SXG intermediaries. That is, there is a =
difference between "I can understand the SXG format" and "I prefer an =
SXG if available". Accept: application/signed-exchange indicates the =
former. No currently-defined header indicates the latter.

However, Accept *can* express that; e.g.,

Accept: application/signed-exchange;q=3D1.0, */*;q=3D0.05

Did you consider using qvalues in the accept header to achieve this?

Cheers,

P.S. It may be good to follow up on ietf-http-wg@w3.org, and then report =
the result back here. I haven't CC:ed them to avoid cross-posting.



> On 7 Sep 2018, at 10:33 am, Devin Mullins =
<twifkak=3D40google.com@dmarc.ietf.org> wrote:
>=20
> Header field name: AMP-Cache-Transform
> Applicable protocol: http
> Status: provisional
> Author: Devin Mullins <twifkak@google.com>; Google; =
https://www.ampproject.org/
> Specification: =
https://github.com/ampproject/amphtml/blob/master/spec/amp-cache-transform=
.md
>=20
> Let me know what other information I can provide.
>=20
> Thanks!
> Devin
> _______________________________________________
> Ietf-message-headers mailing list
> Ietf-message-headers@ietf.org
> https://www.ietf.org/mailman/listinfo/ietf-message-headers

--
Mark Nottingham   https://www.mnot.net/


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From: Devin Mullins <twifkak@google.com>
Date: Fri, 22 Feb 2019 19:10:55 -0800
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--000000000000e5e58f0582870f02
Content-Type: text/plain; charset="UTF-8"

Hi Mark, thanks for the reply. Just a short FYI, I replied with details to
ietf-http-wg last week. It is pending moderator approval; I contacted the
moderator & will let this list know the results of that discussion once
it's happened.

On Mon, Feb 4, 2019 at 7:45 PM Mark Nottingham <mnot@mnot.net> wrote:

> Hi Devin,
>
> Sorry for the delay; I saw this a while ago but didn't look into it
> deeply. For future reference, you're much more likely to get reviews if you
> send this to the HTTP WG mailing list (we're in the process of separating
> HTTP headers out into their own registry, in part to make that more clear).
>
> Without commenting on the entire document you link to, it says:
>
> > Therefore, the need arises for the origin to distinguish requests from
> users and requests from SXG intermediaries. That is, there is a difference
> between "I can understand the SXG format" and "I prefer an SXG if
> available". Accept: application/signed-exchange indicates the former. No
> currently-defined header indicates the latter.
>
> However, Accept *can* express that; e.g.,
>
> Accept: application/signed-exchange;q=1.0, */*;q=0.05
>
> Did you consider using qvalues in the accept header to achieve this?
>
> Cheers,
>
> P.S. It may be good to follow up on ietf-http-wg@w3.org, and then report
> the result back here. I haven't CC:ed them to avoid cross-posting.
>
>
>
> > On 7 Sep 2018, at 10:33 am, Devin Mullins <twifkak=
> 40google.com@dmarc.ietf.org> wrote:
> >
> > Header field name: AMP-Cache-Transform
> > Applicable protocol: http
> > Status: provisional
> > Author: Devin Mullins <twifkak@google.com>; Google;
> https://www.ampproject.org/
> > Specification:
> https://github.com/ampproject/amphtml/blob/master/spec/amp-cache-transform..md
> >
> > Let me know what other information I can provide.
> >
> > Thanks!
> > Devin
> > _______________________________________________
> > Ietf-message-headers mailing list
> > Ietf-message-headers@ietf.org
> > https://www.ietf.org/mailman/listinfo/ietf-message-headers
>
> --
> Mark Nottingham   https://www.mnot.net/
>
>

--000000000000e5e58f0582870f02
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Mark, thanks for the reply. Just a short FYI, I replied=
 with details to ietf-http-wg last week. It is pending moderator approval; =
I contacted the moderator &amp; will let this list know the results of that=
 discussion once it&#39;s happened.</div><br><div class=3D"gmail_quote"><di=
v dir=3D"ltr" class=3D"gmail_attr">On Mon, Feb 4, 2019 at 7:45 PM Mark Nott=
ingham &lt;<a href=3D"mailto:mnot@mnot.net">mnot@mnot.net</a>&gt; wrote:<br=
></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;=
border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Devin,<br>
<br>
Sorry for the delay; I saw this a while ago but didn&#39;t look into it dee=
ply. For future reference, you&#39;re much more likely to get reviews if yo=
u send this to the HTTP WG mailing list (we&#39;re in the process of separa=
ting HTTP headers out into their own registry, in part to make that more cl=
ear).<br>
<br>
Without commenting on the entire document you link to, it says:<br>
<br>
&gt; Therefore, the need arises for the origin to distinguish requests from=
 users and requests from SXG intermediaries. That is, there is a difference=
 between &quot;I can understand the SXG format&quot; and &quot;I prefer an =
SXG if available&quot;. Accept: application/signed-exchange indicates the f=
ormer. No currently-defined header indicates the latter.<br>
<br>
However, Accept *can* express that; e.g.,<br>
<br>
Accept: application/signed-exchange;q=3D1.0, */*;q=3D0.05<br>
<br>
Did you consider using qvalues in the accept header to achieve this?<br>
<br>
Cheers,<br>
<br>
P.S. It may be good to follow up on <a href=3D"mailto:ietf-http-wg@w3.org" =
target=3D"_blank">ietf-http-wg@w3.org</a>, and then report the result back =
here. I haven&#39;t CC:ed them to avoid cross-posting.<br>
<br>
<br>
<br>
&gt; On 7 Sep 2018, at 10:33 am, Devin Mullins &lt;twifkak=3D<a href=3D"mai=
lto:40google.com@dmarc.ietf.org" target=3D"_blank">40google.com@dmarc.ietf.=
org</a>&gt; wrote:<br>
&gt; <br>
&gt; Header field name: AMP-Cache-Transform<br>
&gt; Applicable protocol: http<br>
&gt; Status: provisional<br>
&gt; Author: Devin Mullins &lt;<a href=3D"mailto:twifkak@google.com" target=
=3D"_blank">twifkak@google.com</a>&gt;; Google; <a href=3D"https://www.ampp=
roject.org/" rel=3D"noreferrer" target=3D"_blank">https://www.ampproject.or=
g/</a><br>
&gt; Specification: <a href=3D"https://github.com/ampproject/amphtml/blob/m=
aster/spec/amp-cache-transform..md" rel=3D"noreferrer" target=3D"_blank">ht=
tps://github.com/ampproject/amphtml/blob/master/spec/amp-cache-transform..m=
d</a><br>
&gt; <br>
&gt; Let me know what other information I can provide.<br>
&gt; <br>
&gt; Thanks!<br>
&gt; Devin<br>
&gt; _______________________________________________<br>
&gt; Ietf-message-headers mailing list<br>
&gt; <a href=3D"mailto:Ietf-message-headers@ietf.org" target=3D"_blank">Iet=
f-message-headers@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/ietf-message-headers"=
 rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo=
/ietf-message-headers</a><br>
<br>
--<br>
Mark Nottingham=C2=A0 =C2=A0<a href=3D"https://www.mnot.net/" rel=3D"norefe=
rrer" target=3D"_blank">https://www.mnot.net/</a><br>
<br>
</blockquote></div>

--000000000000e5e58f0582870f02--

