public HttpClient(EsendexCredentials credentials, Uri uri, IHttpRequestHelper httpRequestHelper, IHttpResponseHelper httpResponseHelper)
 {
     HttpRequestHelper = httpRequestHelper;
     HttpResponseHelper = httpResponseHelper;
     Credentials = credentials;
     Uri = uri;
 }
 public ToDoController(IToDoService toDoService,
     IHttpResponseHelper<ToDo, Guid> responseHelper)
 {
     _toDoService = toDoService;
     _responseHelper = responseHelper;
 }