How to provide a default error page if Flask app is not available in Google App Engine

Question

How to provide a default error page if Flask app is not available in Google App Engine. I see the following error if the app is not available and when its being deployed, how do I provide a more user friendly message.

Error: Not Found The requested URL / was not found on this server.

score 2 · Accepted Answer · answered Mar 06 '18 at 14:32

You can't: if the application is not available neither is its config, where custom error pages would be configured.

To avoid such errors it's better to always deploy a new app version and gradually switch traffic to it after it's verified to be working.

How to provide a default error page if Flask app is not available in Google App Engine

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