Google App Engine version numbers?

Question

How do App Engine version numbers work? Are they only integers? Can I use floats? Can I reuse old version numbers?

Answer 1

In order to access a version of your app other than the default one, add #. before your app url as explained here: https://stackoverflow.com/a/8549546/129202 This is useful for testing new versions before you make them live.

If the version of app is 2 and your app URL is appname.appspot.com then URL 2.appname.appspot.com will give you access to version 2 of your app.