nginx.conf

server {
    listen 4444 default_server;
    listen [::]:4444 default_server;

    server_name _;

    error_log /var/log/nginx/error.log warn;

    location / {
        proxy_pass http://localhost:3000;
        proxy_set_header X-Forwarded-Host $scheme://$host:$server_port;
    }
}