Re: [resend] SETTINGS_HTTP2_PRIORITY_MODEL (or SETTINGS_PRIORITY_SCHEME again) | Re: SETTINGS_ENABLE_HTTP2_PRIORITIES default value | Re: Setting to disable HTTP/2 Priorities

Willy Tarreau <w@1wt.eu> Thu, 01 August 2019 06:14 UTC

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Date: Thu, 1 Aug 2019 08:11:42 +0200
From: Willy Tarreau <w@1wt.eu>
To: Kari Hurtta <hurtta-ietf@elmme-mailer.org>
Cc: HTTP Working Group <ietf-http-wg@w3.org>, Lucas Pardue <lucaspardue.24.7@gmail.com>, Brad Lassey <lassey@chromium.org>
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Subject: Re: [resend] SETTINGS_HTTP2_PRIORITY_MODEL (or SETTINGS_PRIORITY_SCHEME again) | Re: SETTINGS_ENABLE_HTTP2_PRIORITIES default value | Re: Setting to disable HTTP/2 Priorities
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Hi Kari,

On Thu, Aug 01, 2019 at 08:09:16AM +0300, Kari Hurtta wrote:
> > I think the confusing part comes from the ENABLE word in the setting
> > name. We could proceed differently by exchanging a supported model
> > for priorities :  SETTINGS_HTTP2_PRIORITY_MODEL
> > It could then take the following values :
> > 
> >     0 (default) : as specified in RFC7540
> >     1           : priorities not sent and silently ignored
> >     2 and above : to be documented in future specifications
> > 
> > This way it seems more natural to consider that unless advertised, we
> > stay on RFC7540 and nothing changes.
> > 
> > Willy
> 
> This is almost same than my SETTINGS_PRIORITY_SCHEME suggestion.

Yes that's what I mentioned afterwards, I've read messages in different
order and found yours after I responded above :-)

Thus I fully support it of course.

> It have only 1 and 0 flipped.
> 
> https://lists.w3.org/Archives/Public/ietf-http-wg/2019JulSep/0140.html

Yep. I tend to prefer keeping zero the default, it generally is easier
to assume that "unset == not changed from default". But this is a very
minor detail.

> Then incompatibility with HTTP/3's SETTINGS frame was cited.
> 
> https://lists.w3.org/Archives/Public/ietf-http-wg/2019JulSep/0141.html

Noted as well.

Thanks,
Willy