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http_cache_etag
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http_cache_etag

(PECL)

http_cache_etag -- Caching by ETag

Description

bool http_cache_etag ( [string etag] )

Attempts to cache the sent entity by its ETag, either supplied or generated by the hash algorithm specified by the INI setting http.etag.mode.

If the clients If-None-Match header matches the supplied/calculated ETag, the body is considered cached on the clients side and a 304 Not Modified status code is issued.

A log entry is written to the cache log if the INI setting http.log.cache is set and the cache attempt was successful.

Parameters

etag

Custom ETag

Return Values

Returns FALSE on failure, or exits with 304 Not Modified if the entity is cached.

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