https://github.com/knative-extensions/eventing-github/blob/f34a508f89e52fe4ebd5eba5f630a0ae07d923cb/pkg/mtadapter/adapter.go#L88-L108

adapter.go

func (a *gitHubAdapter) Start(ctx context.Context) error {
	// Start our multi-tenant server receiving GitHub events
	server := &http.Server{
		ReadTimeout:       10 * time.Second,
		ReadHeaderTimeout: 2 * time.Second,
		Addr:              fmt.Sprintf(":%d", a.port),
		Handler:           a.router,
	}

	done := make(chan bool, 1)
	go common.GracefulShutdown(server, a.logger, ctx.Done(), done)

	a.logger.Infof("Server is ready to handle requests at %s", server.Addr)
	if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
		return fmt.Errorf("could not listen on %s: %v", server.Addr, err)
	}

	<-done
	a.logger.Infof("Server stopped")
	return nil
}