Re: Setting to disable HTTP/2 Priorities

Lucas Pardue <lucaspardue.24.7@gmail.com> Fri, 26 July 2019 03:51 UTC

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From: Lucas Pardue <lucaspardue.24.7@gmail.com>
Date: Thu, 25 Jul 2019 23:48:40 -0400
Message-ID: <CALGR9oZ7CyJ3LD4rmJn+4=E83ad3qc93Nc82-uJMXjiRL+NQjA@mail.gmail.com>
To: Willy Tarreau <w@1wt.eu>
Cc: Brad Lassey <lassey@chromium.org>, HTTP Working Group <ietf-http-wg@w3.org>
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Subject: Re: Setting to disable HTTP/2 Priorities
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Hi Willy!

On Thu, 25 Jul 2019, 23:23 Willy Tarreau, <w@1wt.eu>; wrote:

> Hi Brad,
>
> On Thu, Jul 25, 2019 at 02:49:52PM -0400, Brad Lassey wrote:
> > Hi all,
> > Lucas and I put together a draft to capture at least one of the ways
> > forward that were identified at the priorities side meeting yesterday
> > morning. Please have a look.
> >
> > https://datatracker.ietf.org/doc/draft-lassey-priority-setting/
> > https://github.com/bslassey/priority-setting
>
> While I think that's a very wise approach, I think it would have more
> success if it doesn't change the default behaviour. I mean, some
> developers on both sides have gone through great length implementing
> priorities and expecting now that they should suddenly have to add
> extra code to continue to use them might be difficult to accept.
> Conversely, all those who didn't implement them would have a great
> incentive to add a few lines of code to signal their lack of support
> and immediately expect a better experience. Thus I think priorities
> should remain enabled unless signaled as disabled by this new setting.
>

The aim is to maintain todays default behavior of endpoints supporting H2.
This is achieved by defining the initial value of the setting as 1;
endpoints "opt out" by sending 0.

Do you think we have mis-specced this compared to our aim?

And for having been late to implement them into haproxy (still not
> present), I'd definitely adopt this proposal as a temporary measure
> if it helps improve user experience!
>

That's an interesting data point, thanks for sharing.

Cheers
Lucas