response, err := s.client.Do(request)
	c.Assert(err, nil)

	// assert the http response status code.
	c.Assert(response.StatusCode, http.StatusOK)

	request, err = newTestSignedRequest(http.MethodPut, getPutNotificationURL(s.endPoint, bucketName),
		int64(len(bucketNotificationBuf)), bytes.NewReader([]byte(bucketNotificationBuf)), s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)

	// execute the HTTP request.