Socket.IO client on a Node.js app doesn't connect to the Socket.IO server running on Spring Boot using netty-socketio

[NoelNicholas]

Hi,

I'm facing an issue with setting up Socket.IO for a project. I'm using Spring Boot with the netty-socketio (V2.0.3) dependency for my socket server. It supports 1.x - 4.x versions of Socket.IO clients, as per the release documentation. The server is running, and I've tested it using Postman. I'm able to connect and listen to events and receive acknowledgements etc.

For the client, I'm using Node.js with the socket.io-client(V4.7.2) dependency. I can't for the life for me figure out why it doesn't connect to the server though. Here's my code:

const io = require('socket.io-client');
const socket = io.connect('http://localhost:9092', {reconnect: true, transports:['websocket','polling']});
socket.on('connect', () => {
console.log('Connected to socket:', socket.id);
console.log('Connection status:', socket.connected);
});
socket.on('greetings', (message) => {
console.log("Received message from server: ", message);
});
socket.emit('greetings', '{"message":"Test Message From Node.js"}');
socket.on("disconnect", () => {
console.log("On Disconnect Socket ID: "+socket.id);
});
socket.on('connect_error', function(err){
console.log(err);
});
socket.on('connect_timeout', function(){
console.log("connect_timeout");
});
socket.on('reconnect_attempt', function(){
console.log("reconnect_attempt");
});`

Here's my console output with DEBUG enabled:

socket.io-client:url parse http://localhost:9092 +0ms
socket.io-client new io instance for http://localhost:9092 +0ms
socket.io-client:manager readyState closed +0ms
socket.io-client:manager opening http://localhost:9092 +0ms
engine.io-client:socket creating transport "websocket" +0ms
engine.io-client:socket options: >{"path":"/socket.io/","agent":false,"withCredentials":false,"upgrade":true,"timestampParam":"t","rememberUpgrade":false,"addTrailingSlash":true,"rejectUnauthorized":true,"perMessageDeflate":{"threshold":1024},"transportOptions":{},"closeOnBeforeunload":false,"reconnect":true,"transports":["websocket","polling"],"hostname":"localhost","secure":false,"port":"9092","query":{"EIO":4,"transport":"websocket"},"socket":{"binaryType":"nodebuffer","writeBuffer":[],"secure":false,"hostname":"localhost","port":"9092","transports":["websocket","polling"],"prevBufferLen":0,"opts":{"path":"/socket.io/","agent":false,"withCredentials":false,"upgrade":true,"timestampParam":"t","rememberUpgrade":false,"addTrailingSlash":true,"rejectUnauthorized":true,"perMessageDeflate":{"threshold":1024},"transportOptions":{},"closeOnBeforeunload":false,"reconnect":true,"transports":["websocket","polling"],"hostname":"localhost","secure":false,"port":"9092"},"id":null,"upgrades":null,"pingInterval":null,"pingTimeout":null,"pingTimeoutTimer":null,"readyState":"opening"}} +1ms
engine.io-client:socket setting transport websocket +42ms
socket.io-client:manager connect attempt will timeout after 20000 +45ms
socket.io-client:manager readyState opening +1ms
engine.io-client:socket socket error {"description":{},"type":"TransportError"} +14ms
socket.io-client:manager error +12ms
socket.io-client:manager cleanup +0ms
TransportError: websocket error
at WS.onError (D:\socketio-nodejs-client\node_modules\engine.io-client\build\cjs\transport.js:46:37)
at ws.onerror (D:\socketio-nodejs-client\node_modules\engine.io-client\build\cjs\transports\websocket.js:77:39)
at callListener (D:\socketio-nodejs-client\node_modules\ws\lib\event-target.js:290:14)
at WebSocket.onError (D:\socketio-nodejs-client\node_modules\ws\lib\event-target.js:230:9)
at WebSocket.emit (node:events:513:28)
at emitErrorAndClose (D:\socketio-nodejs-client\node_modules\ws\lib\websocket.js:1002:13)
at ClientRequest. (D:\socketio-nodejs-client\node_modules\ws\lib\websocket.js:854:5)
at ClientRequest.emit (node:events:513:28)
at Socket.socketErrorListener (node:_http_client:502:9)
at Socket.emit (node:events:513:28) {
description: ErrorEvent {
[Symbol(kTarget)]: WebSocket {
_events: [Object: null prototype],
_eventsCount: 4,
_maxListeners: undefined,
_binaryType: 'nodebuffer',
_closeCode: 1006,
_closeFrameReceived: false,
_closeFrameSent: false,
_closeMessage: ,
_closeTimer: null,
_extensions: {},
_paused: false,
_protocol: '',
_readyState: 2,
_receiver: null,
_sender: null,
_socket: null,
_bufferedAmount: 0,
_isServer: false,
_redirects: 0,
_url: 'ws://localhost:9092/socket.io/?EIO=4&transport=websocket',
_req: null,
[Symbol(kCapture)]: false
},
[Symbol(kType)]: 'error',
[Symbol(kError)]: Error: connect ECONNREFUSED ::1:9092
at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1494:16) {
errno: -4078,
code: 'ECONNREFUSED',
syscall: 'connect',
address: '::1',
port: 9092
},
[Symbol(kMessage)]: 'connect ECONNREFUSED ::1:9092'
},
context: undefined,
type: 'TransportError'
}
socket.io-client:manager will wait 981ms before reconnect attempt +37ms
engine.io-client:socket socket close with reason: "transport error" +38ms

What am I doing wrong? Couldn't find any solution after hours of searching, any help would be appreciated!