/**
  * Sends an asset file to the client
  *
  * @param CakeResponse $response The response object to use.
  * @param string $assetFile Path to the asset file in the file system
  * @param string $ext The extension of the file to determine its mime type
  * @return void
  */
 protected function _deliverAsset(CakeResponse $response, $assetFile, $ext)
 {
     ob_start();
     $compressionEnabled = Configure::read('Asset.compress') && $response->compress();
     if ($response->type($ext) === $ext) {
         $contentType = 'application/octet-stream';
         $agent = env('HTTP_USER_AGENT');
         if (preg_match('%Opera(/| )([0-9].[0-9]{1,2})%', $agent) || preg_match('/MSIE ([0-9].[0-9]{1,2})/', $agent)) {
             $contentType = 'application/octetstream';
         }
         $response->type($contentType);
     }
     $response->length(false);
     $response->cache(filemtime($assetFile));
     $response->send();
     ob_clean();
     if ($ext === 'css' || $ext === 'js') {
         include $assetFile;
     } else {
         readfile($assetFile);
     }
     if ($compressionEnabled) {
         ob_end_flush();
     }
 }