localhost - How to connect to Google App Engine server in internal network iMac?

I have 3 iMacs and a Windows machine on my home network, all connected via an Airport Extreme router. I'm developing Google App Engine applications locally on one of the iMacs, and can view applications using http://localhost:8080 (or whatever port I choose).

How do I connect to those applications from other iMacs and Windows machines in my network? I've located the IP for the iMac hosting Google App Engine: 10.0.1.7. But when I try http://10.0.1.7:8080 from another machine it will not load the page.