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<?php
error_reporting(0);
$ts = $_REQUEST['ts'];
$etag = md5($ts);
$ifNoneMatch = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) : "";
preg_match('/"([^"]+)"/', $ifNoneMatch, $matches);
$ifNoneMatch = isset($matches[1]) ? $matches[1] : false;
if ($ifNoneMatch == $etag) {
header('HTTP/1.0 304 Not Modified');
die; // stop processing
}
header("Etag: W/\"" . $etag . "\"");
if ( $ifNoneMatch ) {
echo "OK: " . $etag;
} else {
echo "FAIL";
}
?>
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