NodeJS with NGINX Plus, medium, nginx plus conf

api.conf

upstream api {
    zone api 64k;
    server 127.0.0.1:3000;
    server 127.0.0.1:3001;
}

server {
    listen 8080;

    location / {
       proxy_pass http://api;
       proxy_set_header X-Real-IP $remote_addr;
       proxy_set_header Host $http_host;
       proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    }
    
    location /upstream_conf {
        allow 10.0.0.0/8; # Allow access only from LAN
        deny all;         # Deny everyone else

        upstream_conf;
    }
}