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Re: Add application parameters to QUIC handshake and use it for H3 SETTINGS

David Schinazi <dschinazi.ietf@gmail.com> Thu, 17 October 2019 15:53 UTC

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From: David Schinazi <dschinazi.ietf@gmail.com>
Date: Thu, 17 Oct 2019 08:53:12 -0700
Message-ID: <CAPDSy+7z9akKiPm03PyR7PjtrmUO=mWoFA4y6ft2ERkmEo=g9A@mail.gmail.com>
Subject: Re: Add application parameters to QUIC handshake and use it for H3 SETTINGS
To: Dmitri Tikhonov <dtikhonov@litespeedtech.com>
Cc: Kazuho Oku <kazuhooku@gmail.com>, Eric Rescorla <ekr@rtfm.com>, Nick Harper <nharper=40google.com@dmarc.ietf.org>, Ted Hardie <ted.ietf@gmail.com>, IETF QUIC WG <quic@ietf.org>
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On Thu, Oct 17, 2019 at 7:44 AM Dmitri Tikhonov <dtikhonov@litespeedtech.com>
wrote:

> On Wed, Oct 02, 2019 at 02:20:52PM -0700, David Schinazi wrote:
> > If we decide that the first requests need to operate without knowledge
> > of settings, we're effectively crippling the main extension mechanism
> > we have in HTTP/3.  I'm not comfortable saying that for the entire
> > lifetime of QUICv1 we cannot have extensions that impact the first
> > requests. That feels like painting ourselves into a corner.
>
> Is there prior art?  That is, are there protocols that allow extension
> settings to be specified in a first request/packet?
>

TLS has client hello extensions. TCP has options that can travel with the
SYN.

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