- From: Brian Smith <brian@briansmith.org>
- Date: Thu, 7 May 2009 19:34:43 -0500
- To: "'Julian Reschke'" <julian.reschke@gmx.de>, "'Roy T. Fielding'" <fielding@gbiv.com>
- Cc: "'Brian Smith'" <brian@briansmith.org>, "'Mark Nottingham'" <mnot@mnot.net>, "'HTTP Working Group'" <ietf-http-wg@w3.org>
Julian Reschke wrote: > ""When a cache receives a request that can be satisfied by a stored > response that includes a Vary header field (Section 3.5), it MUST NOT > use that response unless all of the selecting request-headers nominated > by the *stored* Vary header match in both the original request > associated with the stored response, and the presented request, *or > after validating with the origin server*". Section 2.2 already says this (almost), much more clearly. How about this: - Use of server-driven content negotiation (Section 4.1 of [Part3]) - alters the conditions under which a cache can use the response for - subsequent requests. [ed: completely untrue] - - When a cache receives a request that can be satisfied by a stored - response that includes a Vary header field (Section 3.5), it MUST NOT - use that response unless all of the selecting request-headers in the - presented request match the corresponding stored request-headers from - the original request. [ed: redundant with 2.2] The selecting request-headers from two requests are defined to match if and only if the selecting request-headers in the first request can be transformed to the selecting request-headers in the second request by adding or removing linear white space [[anchor11&anchor12]]. + Any selecting request-headers absent from the first request must + be absent from the second request. [ed: Mark's suggestion, + reworded to match the terminology from the first sentence.] The first sentence in Section 2.2 needs to be changed: - For a presented request, a cache MUST NOT return a stored - response, unless: + A cache MUST NOT return a stored response without + validating it, unless: The last bullet point in Section 2.2 needs to be changed: - o the stored response is either: - - * fresh (see Section 2.3), or - - * allowed to be served stale (see Section 2.3.3), or - - * successfully validated (see Section 2.4). + o the stored response is fresh (see Section 2.3) or allowed + to be served stale (see Section 2.3.3). Regards, Brian
Received on Friday, 8 May 2009 00:35:21 UTC