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Re: Recursive HTTP/2 Push

From: Alcides Viamontes E <alcidesv@zunzun.se>
Date: Tue, 9 Feb 2016 11:38:20 +0100
Message-ID: <CAAMqGzbN0U1Yba0+RnUE0oJo_ugo8UUdst1y87LsK168n8xALA@mail.gmail.com>
To: Simone Bordet <simone.bordet@gmail.com>
Cc: HTTP Working Group <ietf-http-wg@w3.org>
As far as I understand B) is perfectly legal. A) is a bit
counter-productive, since it only allows for alternating generations of
pushed resources. We do B at ShimmerCat.  Notice that for PUSH to be
effective the PUSH promises should be delivered as early as possible.
However, a flattened resource tree will include resources that the browser
doesn't need until much later, so it is worth understanding which resources
are those and prioritize frames accordingly.

A related question  is how and if browsers do issue PRIORITY frames on
pushed streams? Is there anything on the RFC about that? I can not find
anything pro- or against....

On Tue, Feb 9, 2016 at 11:14 AM, Simone Bordet <simone.bordet@gmail.com>

> Hi,
> thanks for the feedback so far !
> On Mon, Feb 8, 2016 at 8:37 PM, Patrick McManus <pmcmanus@mozilla.com>
> wrote:
> > I guess I would say that the spec is pretty clear when it says peer
> > initiated - it means to forbid this. OTOH I think you make a good
> argument
> > about the resource tree.
> If servers can only push on peer-initiated streams, there are two cases:
> A) the client requests for recursive.html, gets recursive.css pushed,
> but it always have to explicitly request recursive.png.
> B) the server flattens the resource tree, so that the client requests
> recursive.html, and gets recursive.css and recursive.png pushed.
> I think we'll go for B) in Jetty, unless there are objections stating
> that this is not intended behavior.
> Thanks !
> --
> Simone Bordet
> http://bordet.blogspot.com
> ---
> Finally, no matter how good the architecture and design are,
> to deliver bug-free software with optimal performance and reliability,
> the implementation technique must be flawless.   Victoria Livschitz
Received on Tuesday, 9 February 2016 10:38:54 UTC

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