Uppdatering av hemsidan

<?php
header("Cache-Control: no-cache");
header("Expires: -1");
?>

<?php 
header("Cache-Control: no-cache"); 
header("Expires: -1"); 
?>

/* Force cache revalidation (i.e., override possible caching algorithms).
 * @author x <x@x.x>
 */
public function force_no_cache() {
	if (!headers_sent()) {
		/* The server MUST NOT use a cached copy when responding to
		 * [a "no-cache" cache-control directive]. (see RFC2616 section 14.9.4)
		 *
		 * If a request includes the no-cache directive, it SHOULD NOT
		 * include min-fresh, max-stale, or max-age 
		 * (see RFC2616 section 14.9.4).
		 */
		header("Cache-Control: no-cache");

		/* Expires is probably unnecessary, include at own prerogative.
		 *
		 * The request includes a "no-cache" cache-control directive or, for
		 * compatibility with HTTP/1.0 clients, "Pragma: no-cache". Field
		 * names MUST NOT be included with the no-cache directive in a
		 * request. The server MUST NOT use a cached copy when responding to
		 * such a request. (see RFC2616 section 14.9.4)
		 * (...)
		 * Many HTTP/1.0 cache implementations will treat an Expires value that
		 * is less than or equal to the response Date value as being equivalent
		 * to the Cache-Control response directive "no-cache". If an HTTP/1.1
		 * cache receives such a response, and the response does not include a
		 * Cache-Control header field, it SHOULD consider the response to be
		 * non-cacheable in order to retain compatibility with HTTP/1.0 servers.
		 * (see RFC2616 section 14.9.3)
		 *
		 * HTTP/1.1 clients and caches MUST treat [...] invalid date formats,
		 * especially including the value "0", as in the past (i.e., "already
		 * expired"). (See RFC2616 section 14.21)
		 */
		//header("Expires: 0");

		/* Note that HTTP/1.0 caches might not implement Cache-Control and
		 * might only implement Pragma: no-cache (see RFC2616 section 14.32).
		 *
		 * HTTP/1.1 caches SHOULD treat "Pragma: no-cache" as if the client had
		 * sent "Cache-Control: no-cache". No new Pragma directives will be
		 * defined in HTTP.
		 *
		 * Note: because the meaning of "Pragma: no-cache as a response
		 * header field is not actually specified, it does not provide a
		 * reliable replacement for "Cache-Control: no-cache" in a response
		 * (See RFC2616 section 14.32)
		 */
		header("Pragma: no-cache");
	}
}