[Zope] Make VHM recognise encoded URLs

Hello everyone I have got Zope with CacheFu installed running behind Squid running behind Apache. Unfortunately, CacheFu encodes the URLs to purge whereas Squid does not consider encoded URLs equal to unencoded URLs. So I thought I will just let Apache pass Squid encoded URLs so that they are cached under encoded URLs. But, alas, the VHM does not seem to be triggered by encoded URLs (e.g. /VirtualHostBase/http/www.example.com%3A80/[...]). Is there any way of making the VHM aware of encoded URLs? Or is there another way to solving my problem? Thanks a lot