Subject: [quicwg/base-drafts] Recouple QUIC version and ALPN (#3117)

From: Mike Bishop <[email-masked]>
Date: Thu, 17 Oct 2019 15:09:55 -0700

We've removed the text saying that application protocols can constrain which QUIC versions they can run over.  We need to discuss where the correlation between ALPN tokens and version numbers gets considered.  Some proposals discussed in Cupertino:

- **ALPN tokens imply one specific QUIC version.**  This leads to a possible error case, where an ALPN token is offered/accepted over another QUIC version.
- **Application protocols can restrict which QUIC versions they run over.**  This implies that the QUIC version being spoken must be considered when selecting an ALPN token.

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