Hello,
I understand that the redirection from http to https is not working now for your project. As Google Groups is meant for general discussions, I would recommend that you seek assistance from our regular support channel[1] if this is related to your project or if you believe that there is something wrong with the product, please complete the according Google Issue Tracker as listed here[2]. The secure always option seems correct in the app yaml file.
[1] https://cloud.google.com/support/docs
[2] https://cloud.google.com/support/docs/issue-trackers