code: public boolean isExpected(int status) {
  
          String baseUrl = GWT.getHostPageBaseURL();
          String requestUrl = builder.getUrl();
  
          if (FileSystemHelper.isRequestGoingToFileSystem(baseUrl, requestUrl)) {
              return true;
          } else if (anyStatus) {
              return true;
          } else {
              return expectedStatuses.contains(status);
          }
      }
docs: Local file-system (file://) does not return any status codes.
  Therefore - if we read from the file-system we accept all codes.
  
  This is for instance relevant when developing a PhoneGap application with
  restyGwt.