Here we set a static "lastModifiedTime" and "maxAge" to 20. The browser will consider this document fresh for 20 seconds, then revalidate its cache. After the 304 response, the cache will be good for another 20 seconds. Unless you force a reload, there will only be 304 responses for this page after the initial download. '; require '_include.php'; echo get_content(array( 'title' => $title ,'explain' => $explain ));