When authorizing a Cloud SQL instance for an App Engine instance, it is required to have both instances in the same region - this is stated by Google here as below snapshot.
The issue is that we can choose the region for a Cloud SQL instance when creating it, though I'm not sure how we can choose one for creating/uploading an App Engine instance
So the question is, how to specify a region for App Engine instance?
Europe is available for App Engine apps, currently on a limited basis and by request. https://developers.google.com/appengine/docs/location http://googledevelopers.blogspot.com/2012/12/app-engine-174-released.html https://docs.google.com/forms/d/1W7LsnYRj0eBAzEQlDtFbsVuIZ0nFU2TaP7cZiaY4Z0Q/viewform?formkey=dDllb3FHLS1IdXVIcjVKR3FScklka1E6MQ
App Engine is just in the United States and Europe for now.
Previously on Stack Overflow: Verify/change application region at Google App Engine Change GAE application location
I came across this question 3.5 years later, and gcloud now supports creating App Engine applications for a project in a particular region:
$ gcloud app create --project=$PROJECTID --region=northamerica-northeast1
Alternatively it can be specified in the Google Cloud Console when creating a project's App Engine component.
