(PECL pecl_http >= 0.1.0)
http_cache_etag — Caching by ETag
Attempts to cache the sent entity by its ETag, either supplied or generated by the hash algorithm specified by the INI 설정 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 설정 http.log.cache is set and the cache attempt was successful.
Note: 이 함수는 다음 함수와 함께 사용할 수 있습니다: http_send_data(), http_seld_file() 그리고 http_send_stream().
If this function is used outside the http_send_*() API, it facilitates the ob_etaghandler().
custom ETag
성공시 FALSE를 반환하거나 종료합니다. with 304 Not Modified if the entity is cached. "exits"의 의미에 대해서 INI 설정 http.force_exit를 참고하십시오.
Example #1 A http_cache_etag() example
<?php
http_cache_etag();
http_send_data("data");
?>