How to deal with HTTP connection timed out crashes in Flutter

Question

So I have a method that uses the Flutter HTTP library and is responsible for calling HTTP requests to the server with code like this:

Future<List<DataModel>> fetchData() async {
  try {
    var url = Uri.parse('${baseUrlParse}myapipath');
    var request = await http.get(url);

    var data = jsonDecode(request.body);

    return data;
  } catch (e) {
    print('Catch ${e}');
    rethrow;
  }
}

This code runs fine and has no issues.
It got to the point where when I have no internet connection or server connection fails, the app freezes, and an error file appears (if you're debugging in VS Code), called http_impl.dart, and the error snippet goes something like this:

onError: (error) {
// When there is a timeout, there is a race in which the connectionTask
// Future won't be completed with an error before the socketFuture here
// is completed with a TimeoutException by the onTimeout callback above.
// In this case, propagate a SocketException as specified by the
// HttpClient.connectionTimeout docs.
if (error is TimeoutException) {
  assert(connectionTimeout != null);
  _connecting--;
  _socketTasks.remove(task);
  task.cancel();
  throw SocketException(
      "HTTP connection timed out after $connectionTimeout, "
      "host: $host, port: $port");
}
_socketTasks.remove(task);
_checkPending();
throw error;
});

I have tried to implement from this source and this, but when I make a request but have no connection, this error still occurs.

How to deal with this problem?
What I want is, if there is a problem with HTTP either there is no connection, or it fails to contact the server, then I can make a notification..

Is there something wrong with my code? Please help, thank you

Anushka Pubudu · Accepted Answer · 2023-10-24 15:04:17Z

0

You re throw the exception in your code, You need to catch exception where you call to this method like this.

try { await fetchData(); } catch (e) { // TODO: handle exception }
You can stop VS Code catching unhandled exceptions from this way https://superuser.com/a/1609472

edited Oct 24, 2023 at 15:04

answered Jan 16, 2023 at 9:14

Anushka Pubudu

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1 Comment

Muhammad Faisal Over a year ago

I use retrhrow because i follow dart's suggestion, but it's my fault for not really understanding what is the difference between using throw and retrhrow when use it inside the catch block..

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