protected function filterResponse($response)
    {
        $contentType = $response->getHeader('Content-Type');

        if (!$contentType || false === strpos($contentType, 'charset=')) {
            if (preg_match('/\<meta[^\>]+charset *= *["\']?([a-zA-Z\-0-9]+)/i', $response->getContent(), $matches)) {
                $headers = $response->getHeaders();
                $headers['Content-Type'] = $contentType.';charset='.$matches[1];

                $response = new Response($response->getContent(), $response->getStatus(), $headers);
            }
        }

        return parent::filterResponse($response);
    }