Why doesn't socket.io work on a domain?

Question

JavaScript

212.86.108.252 - everything works fine here
https://bitcoinup.xyz/ - it doesn't work here
Code:

var socket = io.connect('ws://212.86.108.252:2020', {rememberTransport: false});

Everything does not work because of https. How to fix?

Answer 1

var socket = io.connect('wss://212.86.108.252:2020', {rememberTransport: false});

Find the difference?
Change ws to wss .
Moreover, wss has an advantage .