[quicwg/base-drafts] Unclear what to do when QUIC Version Hints are missing (#3061)

David Schinazi <notifications@github.com> Mon, 23 September 2019 23:49 UTC

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Date: Mon, 23 Sep 2019 16:49:29 -0700
From: David Schinazi <notifications@github.com>
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Subject: [quicwg/base-drafts] Unclear what to do when QUIC Version Hints are missing (#3061)
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[draft-quic-http defines QUIC Version Hints](https://tools.ietf.org/html/draft-ietf-quic-http-23#section-3.2.1). This allows the server to indicate which versions of quic-transport it prefers. However, there is no guidance as to what to do in the absence of such hints.

If a client receives `Alt-Svc: h3=":443"` (without any hints), is it expected to start with QUIC version 1, or with the client's preferred QUIC version?

If a client receives `Alt-Svc: h3-23=":443"`, is it expected to start with `0xff000017` (draft-ietf-quic-transport-23)?

We may want to provide guidance in draft-quic-http to ensure everyone's on the same page.

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