// Uploading a new object with Content-Type  "application/json".
	objectName = "test-object.json"
	buffer2 := bytes.NewReader([]byte("hello world"))
	request, err = newTestSignedRequest(http.MethodPut, getPutObjectURL(s.endPoint, bucketName, objectName),
		int64(buffer2.Len()), buffer2, s.accessKey, s.secretKey, s.signer)
	c.Assert(err, nil)
	// setting the request header to be application/json.