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Re: [Webpush] Receipt subscription follow-up

Brian Raymor <Brian.Raymor@microsoft.com> Thu, 28 April 2016 00:30 UTC

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From: Brian Raymor <Brian.Raymor@microsoft.com>
To: Martin Thomson <martin.thomson@gmail.com>, Costin Manolache <costin@gmail.com>
Thread-Topic: [Webpush] Receipt subscription follow-up
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Date: Thu, 28 Apr 2016 00:29:42 +0000
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Subject: Re: [Webpush] Receipt subscription follow-up
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Martin Thomson <martin.thomson@gmail.com> wrote:

>On 28 April 2016 at 05:42, Costin Manolache <costin@gmail.com> wrote:
>> The main purpose of the DELETE ( from my perspective ) is to prevent
>> PS flooding the AS, i.e. to provide a form of flow control. Secondary
>> reason is to provide more info for load balancing the receipts across
>> AS connections.

> Hmm, I just realized that h2 is pretty bad at this specific use case.
> If all you send is headers (which is true in this case), then flow
> control doesn't kick in.  Also, pushes aren't subject to the
> concurrent stream limit because they don't require client interaction.

PS can already rate control an AS:

A push service MAY return a 429 (Too Many Requests) status code
[RFC6585] when an application server has exceeded its rate limit for
push message delivery to a push resource. The push service SHOULD
also include a Retry-After header [RFC7231] to indicate how long the
application server is requested to wait before it makes another
request to the push resource.

We could include outstanding receipts in the guidance for this case?

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