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Re: [Webpush] status code for messages dropped before TTL expiration

Brian Raymor <Brian.Raymor@microsoft.com> Tue, 17 November 2015 21:37 UTC

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From: Brian Raymor <Brian.Raymor@microsoft.com>
To: "Martin Thomson (martin.thomson@gmail.com)" <martin.thomson@gmail.com>, Darshak Thakore <d.thakore@cablelabs.com>
Thread-Topic: [Webpush] status code for messages dropped before TTL expiration
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Date: Tue, 17 Nov 2015 21:37:43 +0000
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Subject: Re: [Webpush] status code for messages dropped before TTL expiration
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On November 11 2015 at 1:23 PM, Martin Thomson <martin.thomson@gmail.com> wrote:

> Generally, I think that we wanted to ask http(bis) for opinions.  

Yes. I have drafted a message and will forward to httpbis today.

> Maybe we can just use TTL.  If it is present (and therefore non-zero)
> then it's an indication that the TTL hasn't run out, even though the
> message resource is Not Found/Gone.

This is a reasonable mitigation. It's a cleaner variation to the 4XX + Acknowledgement-Data header field
proposed in the IETF 94 presentation, since the TTL is more clearly related to the failure.

In addition, if we decide to adopt Acknowledgement-Data later, this ensures that:

1. The data remains opaque. There are no reserved documented values to signal failure.
2. The data remains application specific. The push service is not a source of Acknowledgement-Data - only the user agent.

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