Für die Kommunikation im Internet gibt es einen Standard, der im Hypertext Transfer Protocol -- HTTP/1.1 festgehalten ist. Insbesondere ist dabei das Kapitel 13 Caching in HTTP empfehlenswert.
Da Firefox den Standards genügt und bezüglich des Caches ein Erfüllungsgehilfe ist, muss die Maßnahme am Server erfüllen.
Ich habe nichts dagegen, daß Firefox den Standards genügt. Ich möchte nur gerne wissen, in welcher Form Firefox den folgenden Abschnitt des o.a. Standards unterstützt:
13.1.6 Client-controlled Behavior
While the origin server (and to a lesser extent, intermediate caches, by their contribution to the age of a response) are the primary source of expiration information, in some cases the client might need to control a cache's decision about whether to return a cached response without validating it. Clients do this using several directives of the Cache-Control header.
A client's request MAY specify the maximum age it is willing to accept of an unvalidated response; specifying a value of zero forces the cache(s) to revalidate all responses. A client MAY also specify the minimum time remaining before a response expires. Both of these options increase constraints on the behavior of caches, and so cannot further relax the cache's approximation of semantic transparency.
A client MAY also specify that it will accept stale responses, up to some maximum amount of staleness. This loosens the constraints on the caches, and so might violate the origin server's specified constraints on semantic transparency, but might be necessary to support disconnected operation, or high availability in the face of poor connectivity.
sollte ein Kompromiss sein.