It's much easier when it's just another IP address! :)
And yeah, the reason something like AppEngine or Django wouldn't work is that they, by default, bind only to loopback/127.0.0.1, and are only accessible from the host on which they're running, as a security precaution.
And yeah, the reason something like AppEngine or Django wouldn't work is that they, by default, bind only to loopback/127.0.0.1, and are only accessible from the host on which they're running, as a security precaution.