not upgraded to websocket

[VishalKumarMauray]

Unhandled Exception: WebSocketException: Connection to 'https://testing.lm25aarogyaindia.com:0/ws#' was not upgraded to websocket

• using java as backend

java code:- @Configuration @EnableWebSocketMessageBroker public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {

@Override
public void configureMessageBroker(MessageBrokerRegistry config) {
    config.enableSimpleBroker("/notifications");
    config.setApplicationDestinationPrefixes("/app");
}

@Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
    registry.addEndpoint("/ws");
    registry.addEndpoint("/ws").withSockJS();
}

}

flutter code:- import 'package:flutter/material.dart'; import 'package:web_socket_channel/web_socket_channel.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget { const MyApp({super.key});

@override Widget build(BuildContext context) { const title = 'WebSocket Demo'; return const MaterialApp( title: title, home: MyHomePage( title: title, ), ); } }

class MyHomePage extends StatefulWidget { const MyHomePage({ super.key, required this.title, });

final String title;

@override State createState() => _MyHomePageState(); }

class _MyHomePageState extends State { final TextEditingController _controller = TextEditingController(); final _channel = WebSocketChannel.connect( Uri.parse('wss://echo.websocket.events'), );

@override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text(widget.title), ), body: Padding( padding: const EdgeInsets.all(20), child: Column( crossAxisAlignment: CrossAxisAlignment.start, children: [ Form( child: TextFormField( controller: _controller, decoration: const InputDecoration(labelText: 'Send a message'), ), ), const SizedBox(height: 24), StreamBuilder( stream: _channel.stream, builder: (context, snapshot) { return Text(snapshot.hasData ? '${snapshot.data}' : ''); }, ) ], ), ), floatingActionButton: FloatingActionButton( onPressed: _sendMessage, tooltip: 'Send message', child: const Icon(Icons.send), ), // This trailing comma makes auto-formatting nicer for build methods. ); }

void _sendMessage() { if (_controller.text.isNotEmpty) { _channel.sink.add(_controller.text); } }

@override void dispose() { _channel.sink.close(); _controller.dispose(); super.dispose(); } }

it is connecting to echo server without any error but when i change the url to the desired one it shows the error

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: WebSocketException: Connection to 'https://testing.lm25aarogyaindia.com:0/ws#' was not upgraded to websocket

[VishalKumarMauray]

web_socket_channel: ^2.4.0

i am using this version of the package

[Mae623]

I meet this question, too. Then I find there is a bug in my server. Hoping my experience will help you.

[VishalKumarMauray]

which type of bug you find in your server will you please guide for my project.