How to access CAS Server from Apache through http proxy?

[Rainer Schmitz]

Dear all,

I've following setup:

- Internal Apache protected with mod_cas
- External CAS Server in DMZ

mod_cas setup seems to work up to the point where mod_cas tries to
validate the ticket with the CAS server. I guess mod_cas can't access
the CAS Server because this is only possible via an http proxy.

Is there a way to let mod_cas (or Apache) use an http proxy?

Thanks,
Rainer