is the webserver base url changable ?

I am using Nginx to front various web apps and would like to get TVHeadend to run in a virutal directory eg.

http://mydomain.com/tvheadend

Using the following nginx code....

location /tvheadend {
      include /etc/nginx/proxy.conf;
      proxy_pass http://10.0.60.20:9981/;
    }

I was hoping the above would work but TVheadend rewrites it to...

http://mydomain.com/extjs.html

Is it possible to configure TVheadend so that it had an alternative base url ?

Thanks
Keith...

Tvheadend