Redirect to different machine with Server App
OS X Server uses Apache which is a very flexible application.  OS X Server does provide you with the ability to setup redirects (https://help.apple.com/serverapp/mac/5.0/#/apd1AB74EDF-C5B3-4C20-AD02-42120FF3B208)  If those settings are not sufficient and you are willing to tackle apache configuration files, there are additional options available to you.

Tutorial on Apache Redirects (https://www.digitalocean.com/community/tutorials/how-to-create-temporary-and-permanent-redirects-with-apache-and-nginx)

If you do a google search for "Apache configuration redirect" you'll find a lot more information on the topic.