RDS Proxy Blue/Green Switchover produces SSL disconnect, not AdminShutdown

Noticed this while verifying Blue/Green Switchover through RDS Proxy. The docs say Aurora PostgreSQL returns AdminShutdown: terminating connection due to administrator command during switchover. But through RDS Proxy, I got a different error.

SSL connection has been closed unexpectedly
connection to server was lost

The documented AdminShutdown is what clients receive directly when Blue enters read-only mode. With RDS Proxy, the proxy likely maintains the client connection during the transitional period, continues routing to Blue internally, and drops the connection upon detecting switchover completion. So the client sees an SSL disconnect rather than AdminShutdown.

If your error handling only catches AdminShutdown, it won't detect switchovers through RDS Proxy. Make sure your connection pool health checks and retry logic also cover SSL/connection-lost errors.