http_cache_etag
(PECL pecl_http >= 0.1.0)
http_cache_etag — Caching by ETag
Descrição
$etag
] )Attempts to cache the sent entity by its ETag, either supplied or generated by the hash algorithm specified by the configuração 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 configuração INI http.log.cache is set and the cache attempt was successful.
Nota: Esta função pode ser utilizada em conjunção 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 no sucesso with 304 Not Modified if the entity is cached.
Veja o tópico configuração INI
http.force_exit para o que "exit" significa.
Exemplos
Exemplo #1 A http_cache_etag() example
<?php
http_cache_etag();
http_send_data("data");
?>
Veja Também
- http_cache_last_modified() - Caching by last modification
- ob_etaghandler() - ETag output handler
- http_match_etag() - Match ETag
- a classe HttpResponse se estiver utilizando o PHP 5.1.0 e superiores
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