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After receiving an email from google reporting that the vm: true configuration in appengine flexible environments should be replaced by env: flex, apps that use custom domains are now responding with a HTTP 307 temporary redirect, which points to the -.appspot.com url.

Why does this happen and how can I fix it?

This seems to be problematic when dealing with OPTIONS requests since those requests are no longer handled by my code.

Pedro Ribeiro
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EDIT: See Adam's comment below this answer for newer information.

This issue is currently being tracked in the Public Issue Tracker for App Engine. Feel free to follow that thread for updates on this.

Nick
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    As an update from the linked issue, you can now [apply to be whitelisted](https://cloud.google.com/appengine/docs/flexible/python/upgrading#domain_update) for custom domains on the new appspot-preview.com and avoid the redirect. – Adam Jan 21 '17 at 20:39