-require_once ("./inc/settings.php");
-require_once ("./inc/utils.php");
-require_once ("./inc/db/mysql.php");
+function headers_callback ($output) {
+ $etag = md5 ($output);
+ if ((isset ($_SERVER ["HTTP_IF_NONE_MATCH"])) &&
+ ($_SERVER ["HTTP_IF_NONE_MATCH"] == $etag)) {
+ header ("HTTP/1.1 304 Not Modified");
+ exit ();
+ }