How to configure socket.io for https?

Question

Node.js

Hello.
Trying to get socket.js to work over https.
Everything works with the settings for HTTP and through the server IP (I have a VPS) via HTTPS, but it doesn’t work through a subdomain that has HTTPS.
Settings like this:
Run nodejs script:

var fs = require('fs');
var https = require('https');

var options = {
    key: fs.readFileSync('/var/www/httpd-cert/site/айписервера.key'),
    cert: fs.readFileSync('/var/www/httpd-cert/site/айписервера.crt')
};

server = https.createServer(options);
var io = require('/usr/local/lib/node_modules/socket.io').listen(server);
server.listen(900);

And nginx.conf:

# in the http{} configuration block
upstream socket_nodes {
    ip_hash;
    server io.domain:900 weight=5;
    server io.domain:900;
    server io.domain:900;
    server io.domain:900;
}

server {
    server_name io.domain.com;
    location / {
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_http_version 1.1;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_pass http://socket_nodes;
    }
}

At startup, "infinite waiting" begins on https://io.domain:900 and https://io.domain:900/socket.io/socket.io.js
And as I wrote above, on ip vps: https: //ipvps:900 and https://io.ipvps:900/socket.io/socket.io.js everything works...

Answer 1

https should only be on the front server, in your case on nginx

Answer 2

proxy_pass http://socket_nodes;
You need either socket.io via http to work, or proxy to httpS://socket_nodes