On Nov 14, 2017, at 00:54, Christian Amsüss <[email protected]> 
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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