Try to setup a NGINX reverse proxy

Questions
1

Hello All,

I am trying to setup a NGINX reverse proxy to be able to access remotely to the WEBUI.
I used the following config file in my NGINX :

  location /openbullet/ {
    proxy_pass http://localhost:8069/;
  }

but when I access to the URL in my browser I have this message :

An error has occurred. This application may no longer respond until reloaded. Reload 🗙

Please help to fix my config (I found some messages about NGINX reverse proxy but no tutorial, so sorry in advance if I miss something).