//   - 'Connection: close': tear down the TCP connection
//
// TODO: is there a way to merge WithWaitGroup and this filter?
func WithRetryAfter(handler http.Handler, shutdownDelayDurationElapsedCh <-chan struct{}) http.Handler {
	shutdownRetryAfterParams := &retryAfterParams{
		TearDownConnection: true,
		Message:            "The apiserver is shutting down, please try again later.",
	}