Socket.IO-client Java with Header

Question

I have socket server that need user-id in order to connect. Therefore, I need to set extraHeader to connection constructor. I tried the following code but there's no luck. Please help me get through, thanks.

Add extra header 'x-user-id': userId to connection constructor

private Socket mSocket;
{
    try {
        IO.Options opts = new IO.Options();
        mSocket = IO.socket(socket_url, opts);
        mSocket.io().on(Manager.EVENT_TRANSPORT, new Emitter.Listener() {
            @Override
            public void call(Object... args) {

                Transport transport = (Transport)args[0];
                transport.on(Transport.EVENT_REQUEST_HEADERS, new Emitter.Listener() {
                    @Override
                    public void call(Object... args) {
                        @SuppressWarnings("unchecked")
                        Map<String, List<String>> headers = (Map<String, List<String>>)args[0];
                        // modify request headers
                        headers.put("x-user-id", Arrays.asList("5B59F68B7B7811E88C3E52964BF487E4"));
                    }
                }).on(Transport.EVENT_RESPONSE_HEADERS, new Emitter.Listener() {
                    @Override
                    public void call(Object... args) {
                    }
                });
            }
        });

    } catch (URISyntaxException e) {}
}

This is my swift code that is works.

private init(){
        self.socketManager = SocketManager(socketURL: URL(string:"\(MAIN_URL)/message")!, config: [.log(true),.extraHeaders(["x-user-id":AppManager.instance.userId])])
        self.socket = socketManager?.defaultSocket
    }

Answer 1

The problem is fixed on server side. Here is my configuration. Add this >>>

var server = app.listen(3000, {// options can go here
  transports: ['xhr-polling']
});
io.use((socket, next) => {
  let clientId = socket.handshake.headers['x-user-id'];
});