httpbis: Ticket #39: ETag uniqueness

Link:  http://trac.tools.ietf.org/wg/httpbis/trac/ticket/39

Origin:  http://www.w3.org/mid/1161261658.29399.24.camel@henriknordstrom.net

Component: p4-conditional

From experience I think it's also worthwhile to further stress the importance of ETag uniqueness among variants of a URI. Very few implementations get this part correct. In fact most major web servers have issues here...

Some even strongly believe that entities with different Content-Encoding is the same entity, arguing that since most encoding (at least the standardized ones) can be converted to the same identity encoding so they are in fact the same entity and should have the same strong ETag.

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History

: comment added; component, milestone set (Fri, 04 Jan 2008 06:13:49 GMT)

: comment added; version set (Fri, 04 Jan 2008 06:31:13 GMT)

: comment added; type changed (Thu, 03 Apr 2008 01:05:14 GMT)

: comment added (Mon, 28 Jul 2008 13:15:51 GMT)

Proposal:

Strong entity tags MUST be unique for each representation of a particular resource; they must change if the representation varies over time and/or because of the use of server-driven content negotiation.

: comment added; owner set (Mon, 28 Jul 2008 13:16:04 GMT)

: comment added; milestone changed (Tue, 29 Jul 2008 15:52:40 GMT)

: comment added; type changed (Tue, 29 Jul 2008 16:01:10 GMT)

proposal is for inclusion in p4 section 7.1. However, need WG buy-in for adding a new requirement; flipping to design.

: comment added; milestone changed (Fri, 29 Aug 2008 08:42:58 GMT)

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