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Re: [core] [Lwip] Proxies and observations: "All options MUST be identical"

Carsten Bormann <cabo@tzi.org> Mon, 13 November 2017 17:02 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Tue, 14 Nov 2017 01:02:09 +0800
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To: Christian Amsüss <c.amsuess@energyharvesting.at>
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Subject: Re: [core] [Lwip] Proxies and observations: "All options MUST be identical"
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On Nov 14, 2017, at 00:54, Christian Amsüss <c.amsuess@energyharvesting.at> wrote:
> 
> Hello CoRE and LWIG groups,
> 
> when discussing re-registration of observations in the context of
> OSCORE with Jim and the OSCORE authors, we stumbled upon the sentence
> "All options MUST be identical to those in the original request except
> for the set of ETag Options." about this in RFC7641.

This is a requirement on the client in order to effect a re-registration of interest.

> This is something that servers, especially proxies, should not try to
> enforce, because every case of a request with differing options (or
> FETCH payload) could just as well be a new observation from the client
> on the token whose observation cancellation got lost, or the client
> simply rebooted.

Right.  I don’t think enforcing that all requests are re-registration requests is in the server requirements for 7641?

Grüße, Carsten

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