public function getObjectMetadata($bucketName, $key, $options = array())
    {
        list($config) = $this->parseOptions($options, BosOptions::CONFIG);

        $response = $this->sendRequest(
            HttpMethod::HEAD,
            array(
                BosOptions::CONFIG => $config,
                'bucket_name' => $bucketName,
                'key' => $key,
                'parseUserMetadata' => true
            )
        );

        return $response->metadata;
    }