Re: [quicwg/base-drafts] Application close should be disallowed in Initial or Handshake (#3158)

Kazuho Oku <notifications@github.com> Tue, 29 October 2019 04:04 UTC

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Date: Mon, 28 Oct 2019 21:04:04 -0700
From: Kazuho Oku <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Application close should be disallowed in Initial or Handshake (#3158)
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@marten-seemann I assume you mean _application_-level CONNECTION_CLOSE in 0-RTT.

I do not have a strong opinion on that, though I might point out that allowing that creates a wired state; a client would might send CONNECTION_CLOSE before it knows if the server has accepted or rejected 0-RTT. The question here is if the client is required to retransmit CONNECTION_CLOSE in 1-RTT  when the server rejects 0-RTT.

Considering that, I think we can just forbid the use of application-close in 0-RTT. The client can either wait for the handshake to complete then send an application-level close in 1-RTT, or it can close the connection using a QUIC-level close during the handshake (without exposing why).

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