Proxying to your app running on custom port in NGINX

Hey, I think sticky sessions is something that NGINX Plus offers at the moment. However, I've not really worked with NGINX Plus (as it's not free).

For simple load balancing between multiple instances of the same service running on different ports, here's a configuration that I use:

http {
upstream backend {
   server localhost:3000;
   server localhost:3001;
}

server {
        location / {
            proxy_pass backend;
        }
    }
}