var once sync.Once
	statesRes := make(chan map[ConnState]int, 1)
	shutdownRes := make(chan error, 1)
	gotOnShutdown := make(chan struct{})
	handler := HandlerFunc(func(w ResponseWriter, r *Request) {
		first := false
		once.Do(func() {
			statesRes <- cst.ts.Config.ExportAllConnsByState()
			go func() {
				shutdownRes <- cst.ts.Config.Shutdown(context.Background())
			}()
			first = true
		})