root/releases/0.6rc2/_rss/static.php

<?php

require_once(dirname(dirname(__FILE__)).'/includes.php');

$userref = optional_param('userref');
$username = optional_param('username');
$type = optional_param('type');

$file = $CFG->dataroot.'rss/'.$userref.'/'.$username.'/'.$type.'.xml'; 

if (!file_exists($file)) {
    @header('HTTP/1.0 404 Not Found');
    exit;
}
header("Pragma: public");
header("Cache-Control: public"); 
header('Expires: ' . gmdate("D, d M Y H:i:s", (time()+3600)) . " GMT");


$if_modified_since = preg_replace('/;.*$/', '', $_SERVER['HTTP_IF_MODIFIED_SINCE']);
                    
$tstamp = filemtime($file);
$lm = gmdate("D, d M Y H:i:s", $tstamp) . " GMT";
                    
if ($if_modified_since == $lm) {
    header("{$_SERVER['SERVER_PROTOCOL']} 304 Not Modified");
    exit;
}
                
// Send last-modified header to enable if-modified-since requests
if ($tstamp < time()) {
    header("Last-Modified: " . $lm);
}

header("Content-type: text/xml; charset=utf-8");
readfile($file);

?>