public static function sendFile( $filePath ){
      $config =& CKFinder_Connector_Core_Factory::getInstance("Core_Config");
      if ( $config->getXSendfile() ){
        CKFinder_Connector_Utils_FileSystem::sendWithXSendfile($filePath);
      } else {
        CKFinder_Connector_Utils_FileSystem::readfileChunked($filePath);
      }
    }