Re: [quicwg/base-drafts] Make SERVER_BUSY more generic (#3709)

Kazuho Oku <notifications@github.com> Tue, 02 June 2020 01:37 UTC

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Date: Mon, 01 Jun 2020 18:37:42 -0700
From: Kazuho Oku <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Make SERVER_BUSY more generic (#3709)
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+1 to retaining the current state.

I'm repeating my comment on #3694, but when QUIC is used as the only transport protocol (rather than with happy-eyeballing), it has to be resilient to MITM attacks as TLS over TCP is.

TLS over TCP does not have an unauthenticated error code that tells the client to stop trying to connecting to the server. We cannot have such thing in QUIC, because if we do, QUIC becomes more prone to MITM attacker than TLS over TCP is.

CONNECTION_REFUSED is fine in this respect, because it does not indicate to the client what the reason was. But error codes like SERVER_BUSY or TRY_LATER would have the implications that we cannot have.

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