FortiGate 60D: Route incoming HTTP traffic based on URL?

Hi,

Our FortiGate 60D is now routing incoming HTTP traffic via Virtual IP to a single webserver in DMZ. I would like to route HTTP request to different web servers based on the URL the visitor uses. So:

our.webserver/webapp1 --> route to webserver 1 in DMZ e.g. 192.168.10.2/webapp1

our.webserver/webapp2 --> route to webserver 2 in DMZ e.g. 192.168.10.8/webapp2

Problem is that I can only use IP addresses in Virtual IP.....? Is this possible at all?

Thanks,

Peter