Can't make socket.io work on HTTPS

Question

I'm using simple socket.io 2.0.3 server without express or anything similar to run simple chat feature in my Laravel app.

Everything was working well until I decided to switch website to HTTPS. Now socket.io refuses to connect (ERR_CONNECTION_CLOSED).

Here is my simplest setup:

server.js:

var io = require('socket.io')(8080, {
    origins : //some stuff
});

HTML file

<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.3/socket.io.js"></script>

var socket = io(':8080');
//more stuff

I have all needed certificate files in server folder, intermediate.crt, domain.com.crt and domain.com.key

Can someone help with simplest example how to make this work on https? Thanks in advance!

Edit: Need possible solution without using Express.

Answer 1

I couldn't manage to write this in simple socket.io code, so I ended up using express after all.

Here is the simplest working code if anyone needs it in future:

server.js

var express = require('express');
var app = module.exports = express();
var https = require('https');
var fs = require('fs');
var server = https.createServer({
    key: fs.readFileSync(/*full path to your key*/),
    cert: fs.readFileSync(/*full path to your cert*/),
    ca: fs.readFileSync(/*full path to your intermediate cert*/),
    requestCert: true,
    rejectUnauthorized: false
},app);
server.listen(8080); //listen on port 8080

var io = require('socket.io').listen(server);

io.set('origins', /*your desired origins*/);

io.set('transports', ['websocket',
    'flashsocket',
    'htmlfile',
    'xhr-polling',
    'jsonp-polling',
    'polling']);

var sockets = {};
//your socket logic

in HTML:

var socket = io(':8080',{secure: true});