For example we want to termninate https connections for nextcloud running on TrueNAS on the PiKVM.

See the PiKVM docs:

kvmd-certbot certonly_webroot --agree-tos -n --email simar@gmx.net -d pikvm.machine-deck.jeffries-tube.at,opensky.machine-deck.jeffries-tube.at
# or
kvmd-certbot certonly_webroot --agree-tos -n --email simar@gmx.net --expand -d pikvm.machine-deck.jeffries-tube.at,opensky.machine-deck.jeffries-tube.at

For example for opensky, create a directory /usr/share/kvmd/extras/opensky and then create with nano: nano /usr/share/kvmd/extras/opensky/nginx.ctx-http.conf:

server {
  server_name opensky.machine-deck.jeffries-tube.at;

  listen [::1]:443 ssl proxy_protocol;
  http2 on;
  include /etc/kvmd/nginx/ssl.conf;

  location / {
        proxy_redirect off;
        proxy_set_header host opensky.machine-deck.jeffries-tube.at;
        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 front-end-https on;
        client_max_body_size 20m;
        proxy_pass http://192.168.1.150:30027;
        }

  location /.well-known/carddav {
      return 301 $scheme://$host/remote.php/dav;
  }

  location /.well-known/caldav {
      return 301 $scheme://$host/remote.php/dav;
  }

  location ^~ /.well-known {
      return 301 $scheme://$host/index.php$uri;
  }
}

Edit the config.php for example in the container nextcloud is running in:

  [...],
  'trusted_domains' => 
  array (
    0 => '127.0.0.1',
    1 => 'localhost',
    2 => 'nextcloud',
    3 => 'opensky.machine-deck.jeffries-tube.at',
  ),
  'overwriteprotocol' => 'https',
  'trusted_proxies' => ['192.168.1.235'],
  'forwarded_for_headers' => ['HTTP_X_FORWARDED', 'X_REAL_IP', 'FRONT_END_HTTPS', 'X_FORWARDED_PROTO'],