Support for the Go 1.27 runtime is in Preview.

App Engine permanently blocks insecure traffic with TLS version 1.1 and earlier.

For appspot.com domains, this block occurs at the connection level. For custom domains, the connection might succeed, but the requests are blocked. For more information, see Secure minimum TLS.

Support for the Go 1.27 runtime is in General Availability (GA).

Starting from August 2026, to provide modern security patches and support for MySQL 8.4 and later, the App Engine flexible environment uses Cloud SQL Auth…

Starting from August 2026, to provide modern security patches and support for MySQL 8.4 and later, the App Engine flexible environment uses Cloud SQL Auth Proxy v2 as the built-in sidecar container for connections to Cloud SQL.

Starting from Go runtime version 1.26 and later, the lifecycle support dates align more closely with the Go community release cycle.

For more information, see Runtime support schedule.

You can migrate your App Engine push queues to Cloud Tasks by updating the bundled services SDK.

This method lets you upgrade your app without needing to modify your application code. For more information on how to migrate, see the push queues migration guide ( Preview ).