http_cache_etag
(PECL pecl_http:0.1.0-1.5.5)
http_cache_etag — Caching by ETag
Описание
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.
Замечание: This function may be used in conjunction with http_send_data(), http_send_file() и http_send_stream().
If this function is used outside the http_send_*() API, it facilitates the ob_etaghandler().
Список параметров
- etag
-
custom ETag
Возвращаемые значения
Returns FALSE or exits on success with 304 Not Modified if the entity is cached. See the INI setting http.force_exit for what "exits" means.
Примеры
Пример #1 A http_cache_etag() example
<?php
http_cache_etag();
http_send_data("data");
?>
Смотрите также
- http_cache_last_modified()
- ob_etaghandler()
- http_match_etag()
- the HttpResponse class if you are using PHP 5.1.0 and above
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