I'm trying to map my (naked) domain to an app.
I found this.
I'd like to map my app to http://myurl.com (also known as a naked domain).
Due to recent changes, Google App Engine no longer supports mapping your app to a naked domain. If your domain registrar supports URL redirects, you can redirect from http://yourdomain.com to your app, which can be served from domains like http://www.yourdomain.com or http://appid.yourdomain.com.
For instructions on how to configure a redirect for your Google Apps domain, please see the article on URL forwarding.
Now I'd like not to resort to redirection. I understand udacity.com is hosted on appengine and they seem to use a naked domain.
So, I;m hoping this is just typical bad documentation or not updated. Does anybody have any info on how Udacity solves this problem or how could I produce such a behaviour?
AFAIK AppEngine cannot be map to a naked domain, you can have a proxy mapped on your naked domain they will proxy into the application.
What most applications do is use forward from the naked domain to www where the application is mapped. GoDaddy supports that GoogleApps supports that and various other free and paid DNS services support that.