How to filter App Engine connections by host with Google Cloud SQL Second Generation? (2nd)
问题 Google App Engine seems to automatically tunnel its connections to Cloud SQL 2nd generation internally through Cloud SQL Proxy. This was discovered inadvertently while trying to sort out how to use TLS, unsuccessfully: "TLS requested but server does not support TLS" error with Google Cloud SQL (2nd generation) from Google App Engine? I noticed that this works without allowing unsecured access globally to the Cloud SQL instance... which is nice. However, we can only filter the accepted