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Re: [Webpush] Message expiration (TTL) and Negative Acknowledgements

Brian Raymor <Brian.Raymor@microsoft.com> Tue, 13 October 2015 22:32 UTC

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From: Brian Raymor <Brian.Raymor@microsoft.com>
To: "Martin Thomson (martin.thomson@gmail.com)" <martin.thomson@gmail.com>
Thread-Topic: [Webpush] Message expiration (TTL) and Negative Acknowledgements
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Date: Tue, 13 Oct 2015 22:32:01 +0000
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Cc: "webpush@ietf.org" <webpush@ietf.org>
Subject: Re: [Webpush] Message expiration (TTL) and Negative Acknowledgements
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On October 13 2015 at 3:14 PM, Martin Thomson <martin.thomson@gmail.com> wrote:

> 
> On 13 October 2015 at 15:10, Brian Raymor <Brian.Raymor@microsoft.com>
> wrote:
> >
> > This would be a case where the application server should still receive a
> negative acknowledgement for expiration because it has no awareness that
> the push server could not honor its advertised TTL.  It's closer to the failure
> case where a push server ceases to retry delivery of a message prior to its
> expiration perhaps due to an unresponsive user agent.
> 
> This doesn't need to be reported any differently from the case where
> the push service tried 10 times and gave up.

Then, we're in agreement. When a receipt is requested, the same 5xx status code is returned for either giving up prior to the original expiration or lowering the advertised message expiration and failing to deliver.

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