Запретить кэширование SWF файла браузером

<?php
header('Content-type: application/x-shockwave-flash');
header('Expires: Thu, 01 Jan 1970 00:00:00 GMT, -1');
header('Cache-Control: no-cache, no-store, must-revalidate');
header('Pragma: no-cache');
echo file_get_contents('game.swf');
?>

<object width="640" height="480" align="middle">
<param name="movie" value="game.php" />
<param name="bgcolor" value="#000000" />
<embed src="game.php" width="640" height="480" scale="noscale" bgcolor="#000000" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />
</object>