Using the web UI for utorrent is a fine thing. But the webserver from utorrent is not secure. So it is recommend to use apache as reverse proxy. I tried to change the url, but I wasn’t successful.

Here the set up of cause inside a vhost.

LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_connect_module modules/mod_proxy_connect.so
LoadModule proxy_http_module modules/mod_proxy_http.so

ProxyPass /gui/ http://localhost/gui/
ProxyPassReverse /gui/ http://localhost/gui/