var errno syscall.Errno
	if errors.As(err, &errno) {
		return errno == syscall.ECONNRESET
	}
	return false
}

// Returns if the given err is "http2: client connection lost" error.
func IsHTTP2ConnectionLost(err error) bool {
	return err != nil && strings.Contains(err.Error(), "http2: client connection lost")
}

// Returns if the given err is "connection refused" error
func IsConnectionRefused(err error) bool {

	// connection. This mimics a broken TCP connection that's not properly
	// closed.
	close(stopCh)
	_, err = c.Get("https://" + lb.ln.Addr().String())
	if !IsHTTP2ConnectionLost(err) {
		t.Fatalf("expected HTTP2ConnectionLost error, got %v", err)
	}

// Otherwise it returns false for an immediate fail.
func DefaultShouldRetry(err error) bool {
	// these errors indicate a transient error that should be retried.
	if utilnet.IsConnectionReset(err) || utilnet.IsHTTP2ConnectionLost(err) || apierrors.IsInternalError(err) || apierrors.IsTimeout(err) || apierrors.IsTooManyRequests(err) {
		return true
	}