NGINX /etc/nginx/sites-available

suby.subx.domain.tld

# reverse proxy basic config
# Note 1: after creating this file in /etc/nginx/sites-available link it into sites-enabled:
#  `sudo ln -s /etc/nginx/sites-available/suby.subx.dmain.tld /etc/nginx/sites-enabled/suby.subx.dmain.tld
# Note 2: after changing nginx, make sure to reload nginx config via: `sudo nginx -s reload`
# Note 3: add the new site to certbot via: 
#  `sudo certbot --nginx -d apps.fr31.net -d NEWAPP.server.apps.f
r31.net --register-unsafely-without-email`

upstream NEWAPP {                              # <----- change this line
      server 127.0.0.1:33XYZ;                  # <----- change this line
}

server {
        server_name NEWAPP.server.*;          # <----- change this line
        
        # set to 0 for unlimited. Default is 1M.
        client_max_body_size 0;

        location / {
                proxy_pass http://NEWAPP/;    # <----- change this line
                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 $scheme;
                proxy_set_header Host $http_host;
                proxy_set_header X-NginX-Proxy true;
                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
		        proxy_set_header Connection "Upgrade";
                proxy_redirect off;
                proxy_read_timeout 86400;
                add_header   Front-End-Https   on;
        }
}