my-nginx.conf

server {
    listen            80;
    server_name       localhost;
    
    location / {
        proxy_bind 127.0.0.1;
        proxy_pass http://127.0.0.1:3000;
    }

    error_page 500 502 503 504    /50x.html;
    location = /50x.html {
        root    /usr/share/nginx/html;
    }
}