I have setup a custom domain with a SSL certificate like it is indicated in this page, but when I go to "mycustomdomain".com I get redirected to *.appspot-preview.com.

In that page there is a section called Before you begin indicating that:

To use the latest App Engine Flexible release with a custom domain, please fill out this form to contact us.

But it this form is not working

How can I stop this redirect?

Any help would be greatly appreciated.


You cannot prevent this redirect for the time being. The reason for the application being redirected to your-project-id.appspot-preview.com is that the latest version of the App Engine Flexible environment (which uses env: flex) is on a different infrastructure. This is temporary while much work is being done to promote the flexible environment to General Availability, at which point, this redirect should no longer happen.

The workaround was to use the form you linked but that has since been turned down. At present, there is no official process for having a custom domain whitelisted with one's env: flex application. Nonetheless, we've received your request posted in this related Google Groups thread and will do our best to reach out to you privately as soon as possible.

  • Thanks @Nicholas. Do you have a rough timeframe for when promotion to general availability will be complete? – Aron Feb 9 '17 at 16:04
  • Unfortunately, I do not. As this is a significant effort affecting many components, customers and engineers alike, time frames for such changes can be very difficult to promise. I also don't have the visibility that a product manager would. Nonetheless, the best place to inquire about such an update is the App Engine Google Group. We are fairly active there. I encourage you to search and post there since as I'm certain this is an important issue to many eager developers and teams in the community. – Nicholas Feb 9 '17 at 16:35
  • This issue now appears to be resolved - the preview version of appspot is no longer used to display app results. – bruce May 22 '17 at 8:46

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