Repeatedly send post request error

[slb2709673]

[VERBOSE-2:dart_error.cc(16)] Unhandled exception:
type '(Exception) => Null' is not a subtype of type '(Object) => FutureOr'
#0 _FutureListener.handleError (dart:async/future_impl.dart:145:11)
#1 Future._propagateToListeners.handleError (dart:async/future_impl.dart:645:47)
#2 Future._propagateToListeners (dart:async/future_impl.dart:666:24)
#3 Future._completeError (dart:async/future_impl.dart:485:5)
#4 _SyncCompleter._completeError (dart:async/future_impl.dart:55:12)
#5 _Completer.completeError (dart:async/future_impl.dart:27:5)
#6 _withClient (package:http/http.dart)

#7 post (package:http/http.dart:70:3)
#8 _RightSlideState._loadRightCategroy (package:name/widget/categroy.dart:159:10)
#9 _RightSlideState.didUpdateWidget (package:name/widget/categroy.dart:148:5)
#10 StatefulElement.update (package:flutter/src/widgets/framework.dart:3784:58)
#11 Element.updateChild (package:flutter/src/widgets/framework.dart:<…>

[donny-dont]

@slb2709673 need a reproduction and more info like what version you're using.

[victoraugustolls]

Using with flutter, package version ^0.11.3+16.

I'm having the same issue, code snippet below:

Future<Token> login(String username, String password) async {
    final body = {'email': username, 'password': password};
    final response = await http.post(
      this.baseUrl + '/auth',
      body: json.encode(body),
    );
    if (response.statusCode > 299) {
      print('Error ${response.statusCode}');
      throw("Response code: ${response?.statusCode}");
    } else {
      return Token.fromJson(json.decode(response.body)['data']);
    }
  }

And the stack trace:

[VERBOSE-2:dart_error.cc(16)] Unhandled exception:
type '(dynamic) => void' is not a subtype of type '(Object) => FutureOr<Token>'
#0      _FutureListener.handleError (dart:async/future_impl.dart:145:11)
#1      Future._propagateToListeners.handleError (dart:async/future_impl.dart:645:47)
#2      Future._propagateToListeners (dart:async/future_impl.dart:666:24)
#3      Future._completeError (dart:async/future_impl.dart:485:5)
#4      _SyncCompleter._completeError (dart:async/future_impl.dart:55:12)
#5      _Completer.completeError (dart:async/future_impl.dart:27:5)
#6      Network.login (package:barman/data/repository/api.dart)

Since you're using Flutter this issue probably belongs over there.

However, I think what's common for both of you is that you're facing an 'Unhandled exception'.
@victoraugustolls' code above has two potential causes of this:

• http.post(...) can potentially throw an exception, which isn't caught in the example code.
• the example code itself also throws an exception.

Any uncaught exceptions will bubble up to whoever is calling the example code and will need to be handled there.
You can have a look at the guide on Futures and Error Handling.
But the TL;DR is you can try something like:

login(myUsername, myPassword)
    .then(processValue)
    .catchError(handleError);

[victoraugustolls]

@cskau-g sorry, it was my first day with dart and flutter, and my code was totally off! I should have updated my situation here!

No worries! I hope you were able to have fun and be productive with Dart and Flutter regardless. :)