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Re: New Version Notification for draft-ietf-httpbis-priority-00.txt

From: Ian Swett <ianswett@google.com>
Date: Thu, 5 Mar 2020 15:09:39 -0500
Message-ID: <CAKcm_gPR6opBtPWY2JHj5gS3r0tuJj4HeNRwwJ9QyfMb7eFXRw@mail.gmail.com>
To: Lucas Pardue <lucaspardue.24.7@gmail.com>
Cc: HTTP Working Group <ietf-http-wg@w3.org>, QUIC WG <quic@ietf.org>
I think only sending it on the control stream is fine, as you can bundle a
STREAM frame from the control frame with that of the request stream into a
single datagram.  I don't think I'd object to sending it on the request
stream, but the only clear benefit is saving a few bytes.

And of course, Chrome may change to use the header for the initial priority
at some point after evaluation, but for now this approach is a bit simpler.

On Thu, Mar 5, 2020 at 3:05 PM Lucas Pardue <lucaspardue.24.7@gmail.com>

> On Thu, Mar 5, 2020 at 7:51 PM Ian Swett <ianswett@google.com> wrote:
>> The draft is written with that in mind, but there's no requirement in
>> design or the draft that an implementation can only use the header for
>> initial prioritization.  Chrome uses the frame for initial priority and
>> updates and it seems to work fine.  Obviously only the frame can be used
>> for reprioritization.  I expect Google HTTP/3 servers will end up
>> supporting both.
>> But I think the draft should be updated to describe the frame as HBH and
>> able to be used for either initial or priority updates.
>> In practice, due to reordering, implementations need to handle receiving
>> the frame prior to the request anyway.
>> I hope that clarifies my thinking, Ian
> Based on your implementation experience, would you be happy with the frame
> being restricted to only being sent on the control stream? Or do you see
> some need for allowing that frame on the request stream (noting that doing
> so adds challenges to making it work with HTTP/2)?
Received on Thursday, 5 March 2020 20:10:05 UTC

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