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)
		}