$this->response->setHttpHeader('Content-type', 'application/x-javascript');
        $offset = 5*60;
        $this->response->setHttpHeader('Cache-Control', 'max-age='.$offset.', must-revalidate');
        $this->response->setHttpHeader('Expires', gmdate("D, d M Y H:i:s", time() + $offset).' GMT');
        $this->response->sendHttpHeaders();