public function routeStartup(Zend_Controller_Request_Abstract $request)
    {
        if (!$request->getHeader('User-Agent')) {
            $this
                ->getResponse()
                ->setHttpResponseCode(403)
                ->setHeader('Content-Type', 'text/plain; charset=utf-8')
                ->setBody(implode("\n", self::$_errMessage))
                ->sendResponse();

            exit(403);
        }
    }