Reverse Proxy for Nginx

nginx-reverse-proxy.conf

server {

    server_name example.com;

    root /var/www/html/example.com/html;
    index index.html index.htm;

    client_max_body_size 10G;

     location / {
        proxy_pass http://localhost:4000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

#sudo ln -s /etc/nginx/sites-available/example.com /etc/nginx/sites-enabled/

#start APP
#NODE_ENV=production pm2 start app.js --name eventa
#PORT=4001 pm2 start app.js --name eventa
#pm2 start npm --name "my-app-name" -- run "npm:script"