61 votesHatsekee! Support commented
I am having the same problems. Requiring my customers to verify their domain for App Engine is far to inconvenient and time consuming. So much even, that it is preventing me from migrating all of our infra over to GCP.
A whitelist - like Heroku - along with a CNAME would be a far better implementation for me.
Another solution might be verification trough provisioning an HTTP resource, like uploading a file to the root path of the (sub)domain.
Thanks, this is a great idea!
Thanks for the request! This is something we’re going to take a serious look at doing soon.