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Update draft-ietf-core-groupcomm-bis.md
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Co-authored-by: cabo <[email protected]>
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marco-tiloca-sics and cabo authored Feb 10, 2025
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2 changes: 1 addition & 1 deletion draft-ietf-core-groupcomm-bis.md
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Expand Up @@ -587,7 +587,7 @@ A server endpoint MUST process an ETag Option in a GET or FETCH group request in
A server endpoint that includes an ETag Option in a response to a group request SHOULD construct the ETag Option value in such a way that the value
will be unique to this particular server with a high probability. This practically prevents a collision of the ETag values from different servers in the same CoAP group and application group, which in turn allows the client to effectively validate a particular response of an origin server. This can be accomplished, for example, by embedding a compact ID (or hash) of the server within the ETag value, where the ID is unique (or unique with a high probability) in the scope of the CoAP/application groups.

Note: a CoAP server implementation that is unaware of the updates to {{RFC7252}} made by this document will expect group requests to never contain an ETag Option (see {{Section 8.2.1 of RFC7252}}). Such a server treats an ETag Option in a group request as an unrecognized option per {{Sections 5.4 and 8.2.1 of RFC7252}}, causing it to ignore this (elective) ETag Option regardless of its value, and process the request normally as if that ETag Option was not included.
Note: a CoAP server implementation that is unaware of the updates to {{RFC7252}} made by this document will expect group requests to never contain an ETag Option (see {{Section 8.2.1 of RFC7252}}). Such a server treats an ETag Option in a group request as an unrecognized option per {{Sections 5.4 and 8.2.1 of RFC7252}}, causing it to ignore this (elective) ETag Option regardless of its value, and processes the request normally as if that ETag Option was not included.


## URI Path Selection ##
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