Socket.io configuration resulting in error 404 - node.js

Question

I tried to setup socket.io into my node server in order to make a messaging function for my app but having problem getting to function despite doing test app correct.
server.js:
/* long list of requires */
var express = require('express');
var http = require('http');
var https = require('https');
var config = require('./config');
var app = express();
var server = require('http').createServer(app);
var io = require('socket.io')(server);
io.on('connection', function(socket){
console.log('a user connected');
});
/* ssl setup */
// Create an HTTP service.
http.createServer(app).listen(8000); // opens the port
// Create an HTTPS service identical to the HTTP service.
https.createServer(options, app).listen(4433); // for the ssl
index.html
..bunch of code like bootstrap and angular.js
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.1/socket.io.js"></script>
<script>
var socket = io.connect('http://localhost:8000');
socket.on('connect', function(data) {
socket.emit('join', 'Hello World from client');
});
</script>
I tried to run the site on localhost:8000.
Despite all that, I'm getting error 404 in the console:
GET /socket.io/?EIO=3&transport=polling&t=LnM0Fd3 404
I'm not sure what went wrong with the set up process of socket.io

Answer 1

You're creating three servers, only one of which gets the Socket.io
// createServer No 1
var server = require('http').createServer(app);
var io = require('socket.io')(server);
// ...
// createServer No 2
http.createServer(app).listen(8000); // opens the port
// Create an HTTPS service identical to the HTTP service.
// createServer No 3
https.createServer(options, app).listen(4433); // for the ssl
You should probably only create one server and add the socket.io call to that one.
If you create only the Port 8000 server, you could add it like this:
// (exactly your code, except for the "var server = " in front.
var server = http.createServer(app).listen(8000); // opens the port
// the next line is new:
var io = require('socket.io')(server);
notice that you'll also have to move the io.on...... part below that line.