cancellationToken = new CancellationToken();
      try {
        await HttpClientHelper.get(url,
                cancelToken: cancellationToken,
                timeRetry: Duration(milliseconds: 100),
                retries: 3,
                timeLimit: Duration(seconds: 5))
            .then((response) {
          setState(() {
            msg = response.body;
          });
        });
      } on TimeoutException catch (_) {
        setState(() {
          msg = "TimeoutException";
        });
      } on OperationCanceledError catch (_) {
        setState(() {
          msg = "cancel";
        });
      } catch (e) {
        setState(() {
          msg = "$e";
        });
      }