public function display($method = null, array $params = array())
    {
        $httpClient = $this->getHttpClient();

        if (trim($method)) {
            $method = '/'.ltrim($method, '/');
        }

        $params['key'] = $this->getApiKey();

        $response = $httpClient->get('http://i.embed.ly/1/display'.$method, [
            'query' => $params,
        ]);

        return (string) $response->getBody();
    }