Config for setting up a reverse proxy in front of a nodejs socket.io server

Nginx reverse proxy

# the IP(s) on which your node server is running. I chose port 3000.
upstream node {
    server 127.0.0.1:40000;
}

# the nginx server instance
server {
    listen 0.0.0.0:20000;
    server_name example.com;
    access_log /var/log/nginx/example.log;
    
    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;

        proxy_pass http://node;
        proxy_redirect off;

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
 }