Express & WebSockets - wss connection failed.

const express = require('express');
const cors = require('cors');
const { createServer } = require('http'); // Ensure this is at the top with other requires
const { Server } = require('socket.io');
const axios = require('axios');
const Redis = require('ioredis');
const userSockets = new Map();

// CONFIG //
require('dotenv').config(); 
const stripe = Stripe(process.env.STRIPE_SECRET_KEY);

const app = express();
const corsOptions = {
  origin: 'https://dev-noisse.vercel.app', // Replace with your frontend domain
  methods: ['GET', 'POST'], // Specify the allowed HTTP methods
  allowedHeaders: ['Content-Type'], // Specify the allowed headers
  credentials: true // Allow sending cookies
};
app.use(cors(corsOptions));
const httpServer = createServer(app);

const io = new Server(httpServer, {
  cors: {
    origin: "https://dev-noisse.vercel.app", 
    methods: ["GET", "POST"],
  },
  pingTimeout: 60000, // Increase the ping timeout to 60 seconds
  pingInterval: 25000 // Send a ping every 25 seconds
});

io.on('connection', (socket) => {
  console.log('a user connected');

  socket.on('authenticate', (hunter_id) => {
    // Validate hunter_id here if necessary
    userSockets.set(hunter_id, socket.id);
  });

  socket.on('disconnect', () => {
    for (const [hunter_id, socketId] of userSockets.entries()) {
      if (socketId === socket.id) {
        userSockets.delete(hunter_id);
        console.log(`User with hunter_id ${hunter_id} disconnected`);
        break;
      }
    }
  });
});
......

const PORT = process.env.PORT || 3001;
  httpServer.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
    io.attach(httpServer);
  });
]

const express = require('express');
const cors = require('cors');
const { createServer } = require('http'); // Ensure this is at the top with other requires
const { Server } = require('socket.io');
const axios = require('axios');
const Redis = require('ioredis');
const userSockets = new Map();

// CONFIG //
require('dotenv').config(); 
const stripe = Stripe(process.env.STRIPE_SECRET_KEY);

const app = express();
const corsOptions = {
  origin: 'https://dev-noisse.vercel.app', // Replace with your frontend domain
  methods: ['GET', 'POST'], // Specify the allowed HTTP methods
  allowedHeaders: ['Content-Type'], // Specify the allowed headers
  credentials: true // Allow sending cookies
};
app.use(cors(corsOptions));
const httpServer = createServer(app);

const io = new Server(httpServer, {
  cors: {
    origin: "https://dev-noisse.vercel.app", 
    methods: ["GET", "POST"],
  },
  pingTimeout: 60000, // Increase the ping timeout to 60 seconds
  pingInterval: 25000 // Send a ping every 25 seconds
});

io.on('connection', (socket) => {
  console.log('a user connected');

  socket.on('authenticate', (hunter_id) => {
    // Validate hunter_id here if necessary
    userSockets.set(hunter_id, socket.id);
  });

  socket.on('disconnect', () => {
    for (const [hunter_id, socketId] of userSockets.entries()) {
      if (socketId === socket.id) {
        userSockets.delete(hunter_id);
        console.log(`User with hunter_id ${hunter_id} disconnected`);
        break;
      }
    }
  });
});
......

const PORT = process.env.PORT || 3001;
  httpServer.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
    io.attach(httpServer);
  });
]