*/
public final function entityCache($ETag, $time)
{
$ETag = "\"{$ETag}\"";
HttpHeaders::add('ETag: ' . $ETag);
if (!empty($_SERVER['HTTP_IF_NONE_MATCH'])) {
if (false !== strpos($_SERVER['HTTP_IF_NONE_MATCH'], $ETag)) {
return 304;
}
# If none of the entity tags match,
# then the server MAY perform the requested method as if the If-None-Match header field did not exist,
# but MUST also ignore any If-Modified-Since header field(s) in the request.
$_SERVER['HTTP_IF_MODIFIED_SINCE'] = null;
}
if (isset($_SERVER['HTTP_IF_MATCH']) && false === strpos($_SERVER['HTTP_IF_MATCH'], $ETag)) {
return 412;
}
$time = (int) $time;
HttpHeaders::add('Last-Modified: ' . gmdate('D, d M Y H:i:s \\G\\M\\T', $time));
# DATE_RFC1123
if (!empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) && $time <= strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
return 304;
}
if (!empty($_SERVER['HTTP_IF_UNMODIFIED_SINCE']) && $time > strtotime($_SERVER['HTTP_IF_UNMODIFIED_SINCE'])) {
return 412;
}
HttpHeaders::flush();
}
}
HttpUtils::init();
