Unable to catch DioError

[psgainz]

New Issue Checklist

• [ Yes ] I have searched for a similar issue in the project and found none

Issue Info

Info	Value
Platform Name	Flutter - Android
Platform Version	6.0
Dio Version	e.g. 3.0.7
Visual Studio Code	VSCode 1.36.0
Repro rate	100%
Repro with our demo prj	NA
Demo project link	NA

Issue Description and Steps

Code Snippet

try {
      response = await dio.post(
        'https://wendux.github.io/xsddddd',
        data: data,
        onSendProgress: (sent, total) {
          if (total != -1) {
            pr.update(
              progress: (sent / total * 100),
              message: 'Sending File : ' + ((sent / total * 100).toInt()).toStringAsFixed(0) + "%",
            );
            if(sent == total) print('Sent');
          }
        },
        //Handle Exceptions here (Issues in receiving data - memory or else)
        onReceiveProgress: (received, total) {
          if(total != -1) {
            pr.update(
              progress: (received / total * 100),
              message: 'Receiving Data : ' + ((received / total * 100).toInt()).toStringAsFixed(0) + "%",
            );
            if(received == total) print('Received');
          }
        }
      );
    }
    on DioError catch(e) {
      print(e.response.data);
      print(e.response.headers);
      print(e.response.request);
      await showAlertDialog(context,
       alertTitle: 'Internet Connection Error',
        alertText: 'Please check you internet connection & try again',
        numberButtons: 1
      );
      cancelOp = true;

    }

In dispatchRequest, exception being thrown here

DioError err = assureDioError(e, options);
      throw err;

However it is not caught by the above code snippet

[ffpetrovic]

Same here, can't catch with catch(e) in general, not just on DioError.

[psgainz]

It looks like the issue is due to Flutter framework. Many exceptions of several packages are not caught when running the app in DEBUG Mode. However, I noticed that when you run your application in RELEASE Mode, everything seems to work fine (though mostly, & I don't think every time). Waiting for the dio team to share their opinion on it @ffpetrovic

[ffpetrovic]

Does latest flutter have this issue? @psgainz

[psgainz]

Unfortunately yes!
The only option is to test in RELEASE Mode whenever you feel to test the exception.

[ffpetrovic]

Thanks @psgainz
Did you find this somewhere? Is there an issue for this on the flutter repo?

[psgainz]

I accidentally encountered it while testing in RELEASE Mode. Also, in some stackoverflow post, I read that this issue also persists for google_sign_in package. Exceptions are not caught when thrown by the package. Only in RELEASE Mode, some exceptions are caught, while some exceptions simply do not occur.

https://stackoverflow.com/questions/51914691/flutter-platform-exception-upon-cancelling-google-sign-in-flow

[ffpetrovic]

Yes, I have had this problem with google sign in and also read that release mode fixes it.

[urusai88]

Hello everybody! I have a same problem without any "google signin flow", i am just trying to make http request.
Standart dart HttpClient works well.

[psgainz]

Closing the issue as the exception works correctly in RELEASE Mode

[ffpetrovic]

Debugging in RELEASE mode is very limited. This is not a valid excuse.

[talski]

a workaround is disable all breakpoints in run tab sidebar, the error will be catched and the app will flow

[VenatusSimpleX]

@talski's workaround is not optimal, as we want to catch all uncaught error if possible to prevent accidental crashes. Any plans at all to fix this?

[RaoSaqib7860]

i am handle in this way on debug mode I know its not good practice
Options(
headers: {'Authorization': 'Bearer $token'},
followRedirects: false,
validateStatus: (status) {
return status <= 500;
}
)

[hongdnn]

There are some exceptions that you are not caught.
If you don't know how to handle with those exceptions, go to Run in the left sidebar, at the Breakpoints area, unselect the "Uncaught Exceptions" checkbox.

[hectorAguero]

Now the error with the google signIn flow is already fixed in the dart sdk, I'll try to upgrade to latest dart a downloaded version of the dio package, but now leaks other exception types (but I didn't try the snippet of this issue).

By the way, this issue should not be closed.

Google Sign Flow issue: flutter/flutter#45146
Dart SDK issue: dart-lang/sdk#37953

[a7md0]

Any updates on this? Using latest dart/flutter versions still causing this issue

Flutter (Channel stable, 2.5.3)
Dart SDK version: 2.14.4 (stable)

All these issues discussing the same DioError unhandled exception
#1171 #1253 #1290 #1306

[dawid-niedzwiecki]

Any updates? This stil occurs.

[tpkowastaken]

Can confirm. Just encountered it with this code:

    try{
      await Dio().download(fileUrl, savePath, onReceiveProgress: (count, total) {
        final value = count / total;
        if (valueNotifier.value != value) {
          valueNotifier.value = value;
        }
      });
    }
    catch(e){
      valueNotifier.value = -2;
      return;
    }

[urusai88]

hey? the issue still occurs