Socket.io and Express ERR_SSL_VERSION_OR_CIPHER_MISMATCH - node.js

Question

My code is hosted on the GitHub Pages. I'm trying to connect client to my computer's Node.JS server by IP, but connection says an error ERR_SSL_VERSION_OR_CIPHER_MISMATCH.
That's my server code:
var app = require('express')();
var server = require('https').createServer(app);
var io = require('socket.io')(server);
app.set('port', process.env.PORT || 8080);
app.set('host', process.env.HOST || '0.0.0.0');
server.listen(app.get('port'), app.get('host'), () => {
console.log("Express server listening IP: " + app.get('host'));
});
io.on('connection', socket => {
socket.on('sayHi', data => {
console.log(data.message);
});
});
And this is client side:
const socket = io.connect('https://myPublicIP:8080');
socket.emit('sayHi', { message: 'Hello world' });

Answer 1

That error happen because you using HTTPS for running SocketIO Server.
So we have two way for resolve this issue:
Change require('https') to require('http')
Import your Certificate SSL files when createServer following this example source code
const privateKey = fs.readFileSync(process.env.PRIVATE_KEY, 'utf8')
const certificate = fs.readFileSync(process.env.CERTIFICATE, 'utf8')
const credentials = {
key: privateKey,
cert: certificate,
passphrase: process.env.PASSPHRASE
}
var server = require('https').createServer(credentials, app);
Hope this can help you!