After wanting to do the same I found no way to do so, and believe this is impossible.
My best suggestion: use your own DNS domain, and map to myappid.appspot.com, and get your users to use that. After migration, change DNS to map to newappid.appspot.com Andrew -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-appengine/-/QIt987GzmWcJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
