How to install apache on xbian?

[IriDium]

I haven't run it but as apache + PHP comes as an xbian package it should be kept up to date with future developments.

However, there are many options out there.

do sudo apt-cache search webserver and sudo apt-cache search web/proxy

As @josch mentions it all depends what you want to do with it. If it's just a small webserver for home use, then Apache might be a bit of a juggernaut if all you need is a van.