http.dart invalid argument for onError: Invalid argument (onError): Error handler must accept one Object or one Object and a StackTrace as arguments

user_474330 0
Viewed 3052

I am new to Flutter and I'd like to understand what's wrong with my error handler:

import 'package:http/http.dart' as http;
try {
  var response = await client.get('$endpoint/users/$userId');

  // Convert and return
  return User.fromJson(json.decode(response.body));
} on HttpException catch (ex) {
  print('http');
  print(ex);
  print('exception');
  return null;
} on Error catch (error) {
  // code will go here
  print(error);
  return null;
}

The result is:

I/flutter ( 3103): Invalid argument (onError): Error handler must accept one Object or one Object and a StackTrace as arguments.: Closure: (HttpException) => Null

It is exactly the same as if I didn't do any try/catch, could anyone advise how should I do the Error Handler? From my understanding (error) here should be the "one Object", please correct me if I'm wrong. TIA!

dart flutter http
2 Answers

this is an http dependency bug and it was fixed in version 0.12.2, it should be resolved when you update your dependency.

user_168002430

You need to catch Object too. HttpException and Error do not cover all kinds.

    on Object catch (error) {
      print(error);
      return null;
    }
user_106594820
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