Using JADS Web Traffic Manager, it is fairly easy to provide an SSL secured version of your Google App Engine app on your domain.
- Download the Web Traffic Manager.
- Create https_routes.txt containing:
^/ -> myapp.appspot.com[Protocol=https]
(where myapp is the name of the GAE app)
- Create a Java key store and import your domain's SSL certificate.
- Launch the Web Traffic Manager on a server mapped to your domain
java -Djavax.net.ssl.keyStore=mykeystore -Djavax.net.ssl.keyStorePassword=mykeystorepass -jar wtm-core.jar -cp wtm-http.jar -https 443
All https:// traffic reaching your domain will now be routed securely to the Google App Engine, users will remain on your domain. | 
