I tried all the suggestions for SO, but in the end I found a better solution.
Since I transferred domain names and web hosting, I forgot to change my domain resource records. After making sure that my code worked correctly with the application (appname.appspot.com), I created a custom domain found in the Console menu > App Engine > Settings > Custom domains

After you add the custom domain, make sure to change your CNAME www DNS address with the given value (for me it was ghs.googlehosted.com).
By changing this CNAME value, all of my subsequent deployments are updated immediately. Hope this works for you and everyone else. Happy coding!
source share