Symfony\Component\HttpFoundation\Response::getVary PHP Method

    public function getVary()
    {
        if (!$vary = $this->headers->get('Vary', null, false)) {
            return array();
        }

        $ret = array();
        foreach ($vary as $item) {
            $ret = array_merge($ret, preg_split('/[\s,]+/', $item));
        }

        return $ret;
    }

 protected function logResponse(Response $response, Request $request)
 {
     if ($response->getStatusCode() >= 500) {
         $color = LogLevel::ERROR;
     } elseif ($response->getStatusCode() >= 400) {
         $color = LogLevel::WARNING;
     } elseif ($response->getStatusCode() >= 300) {
         $color = LogLevel::NOTICE;
     } elseif ($response->getStatusCode() >= 200) {
         $color = LogLevel::INFO;
     } else {
         $color = LogLevel::INFO;
     }
     $msg = 'Response {response_status_code} for "{request_method} {request_uri}"';
     $context = array('request_method' => $request->getMethod(), 'request_uri' => $request->getRequestUri(), 'response_status_code' => $response->getStatusCode(), 'response_charset' => $response->getCharset(), 'response_date' => $response->getDate(), 'response_etag' => $response->getEtag(), 'response_expires' => $response->getExpires(), 'response_last_modified' => $response->getLastModified(), 'response_max_age' => $response->getMaxAge(), 'response_protocol_version' => $response->getProtocolVersion(), 'response_ttl' => $response->getTtl(), 'response_vary' => $response->getVary());
     $this->logger->log($color, $msg, $context);
 }