web server redirect

Forgive me if this is in the wrong group. I am new to this.

I have a web application that has two different versions. The first
version is accessed through server A and the second version accessed
through server B. Currently I have two different URL's for each server,
but I would like to use one URL that will direct to a server that will
lookup the IP address for the correct web application. For example:

www.abc.com/xyz should direct the user to 1.1.1.1

www.abc.com/qrs should direct the user to 2.2.2.2

How do I accomplish this? Do I need to setup some kind of hosting table
or something?

Thanks a bunch.

Corey