Nginx proxy pass

default.conf

server {
	server_name  example.com     www.example.com;
    	root         /path/to/codebase;

		# Load configuration files for the default server block.
    	include /etc/nginx/default.d/*.conf;
        charset utf-8;
	
	location / {
        	proxy_set_header      X-Real-IP $remote_addr;
        	proxy_set_header      X-Forwarded-For $proxy_add_x_forwarded_for;
        	proxy_set_header      X-Forwarded-Proto https;
        	proxy_set_header      X-Forwarded-Port 443;
        	proxy_set_header Host $host;
        	proxy_pass http://127.0.0.1:3000;
    	}
    	
    	# Certbot config goes here!
}