protected function ensureIEOverSSLCompatibility(Request $request)
{
if (false !== stripos($this->headers->get('Content-Disposition'), 'attachment') && preg_match('/MSIE (.*?);/i', $request->server->get('HTTP_USER_AGENT'), $match) == 1 && true === $request->isSecure()) {
if ((int) preg_replace('/(MSIE )(.*?);/', '$2', $match[0]) < 9) {
$this->headers->remove('Cache-Control');
}
}
}