Web socket server

server.js

const Server = require('ws').Server;
const https = require('https');
const express = require('express');

const app = express();

//Express static server stuff. This can be whatever you want, just an example of using Express.
app.use(express.static(path.join(__dirname, '../public')));

//`config` has the (absolute) paths to the files, and the desired port to run over.

const httpsServer = https.createServer({
    key: fs.readFileSync(config.ssl_key),
    cert: fs.readFileSync(config.ssl_cert),
}, app).listen(config.port);

const socket = new Server({
    server: httpsServer,
});

socket.on('connection', function(ws) {
    if(ws.upgradeReq.headers.origin !== 'ExpectedHostname') {
        //You should error here.
        //You should do this because web sockets don't do cross-origin checks.
    }
    //Yay! Successfull connection from your client!
}