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Re: [quicwg/base-drafts] When to send the SETTINGS frame (#2945)

Mike Bishop <notifications@github.com> Tue, 13 August 2019 22:41 UTC

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Subject: Re: [quicwg/base-drafts] When to send the SETTINGS frame (#2945)
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The problem with the Handshake is that the client is sending it prior to the ALPN selection, which means it has to send the settings for each protocol it's proposing.

There are a couple interwoven issues here.  Let's try to untangle them:
- We can avoid the lost-settings case if we remove permission for the server to omit unchanged values.  Server MUST send all settings, but MUST NOT indicate any settings more restrictive than those the client has remembered.
- If no SETTINGS frame was received on the same connection as an NST, the client MUST assume the default settings in Early Data.  This also incents the server to actually send the SETTINGS frame even if nothing has changed.

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