go http.Server example: clean exit with pod delete

	// wait group to ensure a clean exit
	wg sync.WaitGroup

	log.Println("start listener")

	// wrap entire mux with logging, bearer token, and apiKey middleware
	wrappedMux := NewEnsureAuth(mux)

	// run via a goroutine
	wg.Add(1)
	go func() {
		defer wg.Done()

		// create a 'server' so we can later use 'shutdown'
		srv := &http.Server{
			Addr:    ":8080",
			Handler: wrappedMux,
		}

		// handle SIGINT / SIGTERM
		go func() {
			sigint := make(chan os.Signal)
			signal.Notify(sigint, os.Interrupt, syscall.SIGTERM)
			<-sigint

			log.Println("catch SIGTERM")

			// cancel routine during shutdown, if needed
			sigctx, sigcancel := context.WithTimeout(context.Background(), 20*time.Second)
			defer func() {
				// extra handling here
				sigcancel()
			}()

			// stop listening, finish calls in progress, then exit
			if err := srv.Shutdown(sigctx); err != nil {
				log.Fatalf("- shutdown handler: %+v", err)
			}
			log.Print("- shutdown handler exited")
		}()

		// begin handling connections
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %s\n", err)
		}
	}()

	wg.Wait()