Implementing Graceful Shutdown in Go servers.

Graceful shutdown ensures a server finishes processing active requests before exiting, preventing data loss during deployments.

You run the HTTP server in a goroutine. The main thread uses a os.Signal channel to listen for SIGINT or SIGTERM (sent by Kubernetes or Docker). Upon receiving the signal, you call server.Shutdown(ctx). This instantly rejects new connections but allows active ones to complete within a given timeout.