public function addBucketCname($bucket, $cname, $options = NULL)
    {
        $this->precheckCommon($bucket, NULL, $options, false);
        $options[self::OSS_BUCKET] = $bucket;
        $options[self::OSS_METHOD] = self::OSS_HTTP_POST;
        $options[self::OSS_OBJECT] = '/';
        $options[self::OSS_SUB_RESOURCE] = 'cname';
        $options[self::OSS_CONTENT_TYPE] = 'application/xml';
        $cnameConfig = new CnameConfig();
        $cnameConfig->addCname($cname);
        $options[self::OSS_CONTENT] = $cnameConfig->serializeToXml();
        $options[self::OSS_COMP] = 'add';

        $response = $this->auth($options);
        $result = new PutSetDeleteResult($response);
        return $result->getData();
    }