proxy nginx to nginx simple

localhost.conf

server {
    listen 80;
    server_name localhost;
    access_log off;

    location / {
        proxy_pass http://127.0.0.1:3000;
        proxy_set_header    Host            $host;
        proxy_set_header    X-Real-IP       $remote_addr;
        proxy_set_header    X-Forwarded-for $remote_addr;
        port_in_redirect off;
        proxy_connect_timeout 300;
    }
}