Apache as Proxy

[William McKenzie]

I've searched the archives, but cant really find a clear answer to this
question.  Can Tomcat be used as a web proxy server (i'm thinking inbound
here - using tomcat to proxy requests back to a second tomcat instance on a
different machine or port), and if so, what additional code is necessary,
and what kinds of things go in server.xml or web.xml to support it?  Any
clues would be appreciated.

TIA
Bill