func mustNewSignedV2Request(method string, urlStr string, contentLength int64, body io.ReadSeeker, t *testing.T) *http.Request {
	req := mustNewRequest(method, urlStr, contentLength, body, t)
	cred := globalActiveCred
	if err := signRequestV2(req, cred.AccessKey, cred.SecretKey); err != nil {
		t.Fatalf("Unable to initialized new signed http request %s", err)
	}
	return req
}

// This is similar to mustNewRequest but additionally the request

	req.URL.RawQuery = query.Encode()

	// Save signature finally.
	req.URL.RawQuery += "&Signature=" + url.QueryEscape(signature)
	return nil
}

// Sign given request using Signature V2.
func signRequestV2(req *http.Request, accessKey, secretKey string) error {
	signer.SignV2(*req, accessKey, secretKey, false)
	return nil
}

// Sign given request using Signature V4.

		int64(buffer1.Len()), buffer1, s.accessKey, s.secretKey, s.signer)
	request.Header.Set("Content-Type", "application/json")
	if s.signer == signerV2 {
		c.Assert(err, nil)
		err = signRequestV2(request, s.accessKey, s.secretKey)
	}
	c.Assert(err, nil)
	// execute the HTTP request for object upload.
	response, err = s.client.Do(request)
	c.Assert(err, nil)

		if testCase.metadataCopy {
			reqV2.Header.Set("X-Amz-Metadata-Directive", "COPY")
		}
		if testCase.metadataGarbage {
			reqV2.Header.Set("X-Amz-Metadata-Directive", "Unknown")
		}

		err = signRequestV2(reqV2, testCase.accessKey, testCase.secretKey)
		if err != nil {
			t.Fatalf("Failed to V2 Sign the HTTP request: %v.", err)
		}