What does _ah mean in Google App Engine?

Question

Does the _ah mean anything in Google App Engine?

I\'m not looking to find out what it\'s used for or where is it located and how it works. As some answers b

Answer 1

It comes from apphosting, the underscore is to make it more difficult to collide with some user provided URL.

Edit: I worked at Google, apphosting was the first name they selected for AppEngine, and this name still remains in some parts of the internal configuration.