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Re: Repurpose of priority | Re: SETTINGS_PRIORITY_SCHEME | Re: Setting to disable HTTP/2 Priorities

Lucas Pardue <lucaspardue.24.7@gmail.com> Thu, 01 August 2019 17:51 UTC

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From: Lucas Pardue <lucaspardue.24.7@gmail.com>
Date: Thu, 01 Aug 2019 18:47:22 +0100
Message-ID: <CALGR9obEjQnFTSnyUjx40vd8EvwHLjuovNxjWaT_3euKcnm1Hg@mail.gmail.com>
To: Kari Hurtta <hurtta-ietf@elmme-mailer.org>
Cc: HTTP Working Group <ietf-http-wg@w3.org>, Matthew Kerwin <matthew@kerwin.net.au>, Brad Lassey <lassey@chromium.org>, Dmitri Tikhonov <dtikhonov@litespeedtech.com>
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Subject: Re: Repurpose of priority | Re: SETTINGS_PRIORITY_SCHEME | Re: Setting to disable HTTP/2 Priorities
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On Thu, Aug 1, 2019 at 5:46 PM Kari Hurtta <hurtta-ietf@elmme-mailer.org>
wrote:

> So if SETTINGS frame changes meaning of PRIORITY data which is already
> sent, that causes that server will interpreted it different than
> what http client intended.
>
> There may be also Stream Dependency field on HEADERS frame.
>
> And also PRIORITY frame may be send before HEADERS frame when stream
> is on idle state.
>
> So that repurpose will not work.
>
>
Any client that is taking the chance to make a semantic change to the
frames it is sending would be foolish to not wait on an affirmative signal
from the server. RFC 7540 Section 5.5. calls specific attention to such a
repurposing:

>    Extensions that could change the semantics of existing protocol
   components MUST be negotiated before being used.  For example, an
   extension that changes the layout of the HEADERS frame cannot be used
   until the peer has given a positive signal that this is acceptable.

Lucas

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