Hello, Is that possible to map Port to URI with Rack?

I want to integrate Site writen in Ruby with Zimbra Mail and some other
systems:

Site URI: www.company.com/site <= localhost:80
Zimbra Mail: www.company.com/site/mail <= localhost:81
App XXX: www.company.com/site/xxx <= localhost:XX

As i understand it's possible to do with Unix Port Forwarding and Some
Apache Machinery, but it would be a lot simpler and better to do it with
Rack.

Thanks!
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