Caddyfile

domain.duckdns.org {
    root c:\caddy
    basicauth / user password

    proxy /tautulli 192.168.1.234:8181 {
        transparent
    }
    timeouts {
      read none
      write none
      header none
    }
}

qbittorrent.domain.duckdns.org {
    proxy / 127.0.0.1:9999 {
        header_upstream X-Forwarded-Host {host}:9999
        header_upstream -Origin
        header_upstream -Referer
    }
}

dog.domain.duckdns.org {
    proxy / 192.168.1.231 {

       transparent
    }
}