Traffic und Browser Cache

[Art]

hi all,

der broswer, wenn aktiviert, speichert ja eine menge dateien in seinem cache, bilder cookies usw. wie wirkt sich das auf den traffic eines servers aus. nehmen wir doch als beispiel das forum hier. ich verfolge so die threads die mich interessieren. ich denke mal die smilies usw. hat der browser dann in seinem cache. wie läuft das nun, wenn ich die seite neu anfordere? verringert der browser cache auch den traffic auf den server?

[Jaraz]

Original geschrieben von Art

verringert der browser cache auch den traffic auf den server?

Hallo,

klar, der Browser fragt dann an ob sich die Datei geändert hat. Falls nicht, bekommt der vom Webserver anstatt Status Code 200, Status Code 304 "not modified" zurück und lädt die Datei aus dem Cache.

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10.3.5 304 Not Modified

If the client has performed a conditional GET request and access is allowed, but the document has not been modified, the server SHOULD respond with this status code. The 304 response MUST NOT contain a message-body, and thus is always terminated by the first empty line after the header fields.

The response MUST include the following header fields:

- Date, unless its omission is required by section 14.18.1

If a clockless origin server obeys these rules, and proxies and clients add their own Date to any response received without one (as already specified by [RFC 2068], section 14.19), caches will operate correctly.

- ETag and/or Content-Location, if the header would have been sent

in a 200 response to the same request

- Expires, Cache-Control, and/or Vary, if the field-value might

differ from that sent in any previous response for the same

variant

If the conditional GET used a strong cache validator (see section 13.3.3), the response SHOULD NOT include other entity-headers. Otherwise (i.e., the conditional GET used a weak validator), the response MUST NOT include other entity-headers; this prevents inconsistencies between cached entity-bodies and updated headers.

If a 304 response indicates an entity not currently cached, then the cache MUST disregard the response and repeat the request without the conditional.

If a cache uses a received 304 response to update a cache entry, the cache MUST update the entry to reflect any new field values given in the response.

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Gruß Jaraz

[Art]

wow. thx