You are correct, the easiest way to connect to your Cloud SQL instance from App Engine, as previously recommended, is to directly connect to it <https://cloud.google.com/appengine/docs/flexible/dotnet/using-cloud-sql#setting_the_connection_string> using the Cloud SQL instance's IP address. It is recommended though to include the SSL cert when making the connection if you plan on running your app from your local development environment.
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