[off topic] Configuring an IP blind Apache server

[Jonathan D. Proulx]

Hi,

My appologies in advance this is clearly off topic, but couldn't think
where else to ask...so please reply directly to me.

I'd like a _reverse_ anonymizing proxy, something that blinds Apache
to the incoming IP adresses in client HTTP requests.  I run a
webserver with a couple of virtual servers (in the apache sense not
the Xen/VMWare sense) run by different people and I'd like to scrub
the IP info from traffic before Apache gets it so that neither their
vhost configs nor their CMS can log IPs even if they want to.

It seesm like there should be a way to plub in privoxy or something,
but I can quite think how.  Any suggestions or pointers?

Obviously running them as hidden services would fix this, but I don't
want the services hidden per se.

Thanks,
-Jon