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How to manage web socket connection refused errors?


Async/Await on appengineReceiving data from localhost throws 'Connection Refused Error'Flutter Http error SocketException: OS Error: Connection refusedFlutter how to connect a socket?Flutter gRPC error - OS Error: Connection refusedhow to connect TCP Socket server client with authentication in DartDart upgrade client Socket to WebSocketHow to return socket data from Future in Dart?How to connect Flutter app to tcp socket server?How to use Dart socket onError as inline function?













0















I'm not able to understand how to check the status of a IOWebSocketChannel before adding a message to the sink or how to be notified for errors in case message is not sent.



Supposing web socket server is not listening on localhost:8080, how to check for channel.sink.add errors or to capture exceptions about failed socket sends?



import 'package:web_socket_channel/io.dart';

void main() async
IOWebSocketChannel channel;

channel = IOWebSocketChannel.connect('ws://localhost:8080/');
channel.stream.listen((data) , onError: (err)
print("err: $err");
, onDone: ()
print(
"onDone. reason:[$channel.closeReason], code:[$channel.closeCode]");
);

print("sending a message");

// how to check that channel's socket is in a connected state?
channel.sink.add("hello");

print("done");










share|improve this question


























    0















    I'm not able to understand how to check the status of a IOWebSocketChannel before adding a message to the sink or how to be notified for errors in case message is not sent.



    Supposing web socket server is not listening on localhost:8080, how to check for channel.sink.add errors or to capture exceptions about failed socket sends?



    import 'package:web_socket_channel/io.dart';

    void main() async
    IOWebSocketChannel channel;

    channel = IOWebSocketChannel.connect('ws://localhost:8080/');
    channel.stream.listen((data) , onError: (err)
    print("err: $err");
    , onDone: ()
    print(
    "onDone. reason:[$channel.closeReason], code:[$channel.closeCode]");
    );

    print("sending a message");

    // how to check that channel's socket is in a connected state?
    channel.sink.add("hello");

    print("done");










    share|improve this question
























      0












      0








      0








      I'm not able to understand how to check the status of a IOWebSocketChannel before adding a message to the sink or how to be notified for errors in case message is not sent.



      Supposing web socket server is not listening on localhost:8080, how to check for channel.sink.add errors or to capture exceptions about failed socket sends?



      import 'package:web_socket_channel/io.dart';

      void main() async
      IOWebSocketChannel channel;

      channel = IOWebSocketChannel.connect('ws://localhost:8080/');
      channel.stream.listen((data) , onError: (err)
      print("err: $err");
      , onDone: ()
      print(
      "onDone. reason:[$channel.closeReason], code:[$channel.closeCode]");
      );

      print("sending a message");

      // how to check that channel's socket is in a connected state?
      channel.sink.add("hello");

      print("done");










      share|improve this question














      I'm not able to understand how to check the status of a IOWebSocketChannel before adding a message to the sink or how to be notified for errors in case message is not sent.



      Supposing web socket server is not listening on localhost:8080, how to check for channel.sink.add errors or to capture exceptions about failed socket sends?



      import 'package:web_socket_channel/io.dart';

      void main() async
      IOWebSocketChannel channel;

      channel = IOWebSocketChannel.connect('ws://localhost:8080/');
      channel.stream.listen((data) , onError: (err)
      print("err: $err");
      , onDone: ()
      print(
      "onDone. reason:[$channel.closeReason], code:[$channel.closeCode]");
      );

      print("sending a message");

      // how to check that channel's socket is in a connected state?
      channel.sink.add("hello");

      print("done");







      dart flutter






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Mar 7 at 10:19









      attdonaattdona

      4,37521622




      4,37521622






















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