public function listMultipartUploads($bucket, $options = null)
    {
        $this->precheckCommon($bucket, NULL, $options, false);
        $options[self::OSS_METHOD] = self::OSS_HTTP_GET;
        $options[self::OSS_BUCKET] = $bucket;
        $options[self::OSS_OBJECT] = '/';
        $options[self::OSS_SUB_RESOURCE] = 'uploads';

        foreach (array('delimiter', 'key-marker', 'max-uploads', 'prefix', 'upload-id-marker') as $param) {
            if (isset($options[$param])) {
                $options[self::OSS_QUERY_STRING][$param] = $options[$param];
                unset($options[$param]);
            }
        }
        $query = isset($options[self::OSS_QUERY_STRING]) ? $options[self::OSS_QUERY_STRING] : array();
        $options[self::OSS_QUERY_STRING] = array_merge(
            $query,
            array(self::OSS_ENCODING_TYPE => self::OSS_ENCODING_TYPE_URL)
        );

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