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0-RTT usage rules are wrong

Martin Thomson <mt@lowentropy.net> Thu, 19 November 2020 06:00 UTC

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Date: Thu, 19 Nov 2020 17:00:25 +1100
From: Martin Thomson <mt@lowentropy.net>
To: quic@ietf.org
Subject: 0-RTT usage rules are wrong
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I was just reviewing the applicability draft (Brian, Mirja, expect a PR soon).  I was surprised to see such a strong assertion regarding idempotence in there.  I followed the link to the TLS draft and found that the text there was just wrong.  Not badly wrong, but wrong in a way that conflicts with RFC 8470.

Now, I wrote both, so there is no excuse.  But I'd like to be given a chance to fix this.

Issue: https://github.com/quicwg/base-drafts/issues/4393
Pull Request: https://github.com/quicwg/base-drafts/pull/4394

This is a substantive change that better aligns the rules here with existing work.

Cheers,
Martin

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