SAP Web Dispatcher - hide URL string on web browser

Hi

We want to setup SAP Web Dispatcher to hide part of the URL string as detailed below. We don't want users to see the full URL string as they navigate on the web browser.

Eg

Actual URL full string:

http://hostname-as-fqdn:<port>/sap/public/gghaa22/asdjjeetc

URL string that we want users to see on their web browser:

http://hostname-as-fqdn:<port>/sap/

This is to prevent people from knowing the string and attempting to type it in. Is there a way this can be setup without the need to introduce Apache or MS IIS??

Thanks

Dave