http_cache_etag
(PECL pecl_http:0.1.0-1.5.5)
http_cache_etag — Caching by ETag
Descrição
Attempts to cache the sent entity by its ETag, either supplied or generated by the hash algorithm specified by the Definições INI 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 Definições INI http.log.cache is set and the cache attempt was successful.
Nota: Esta função pode ser usada em conjunto com http_send_data(), http_send_file() e http_send_stream().
If this function is used outside the http_send_*() API, it facilitates the ob_etaghandler().
Parâmetros
- etag
-
custom ETag
Valor Retornado
Retorna FALSE ou exits em caso de sucesso with 304 Not Modified if the entity is cached. Veja a Definições INI http.force_exit para saber o que "exits" significa.
Exemplos
Example#1 A http_cache_etag() example
<?php
http_cache_etag();
http_send_data("data");
?>
Veja também
- http_cache_last_modified()
- ob_etaghandler()
- http_match_etag()
- a classe HttpResponse se você esta usando o PHP 5.1 e acima