if err != nil {
		return nil, err
	}
	handler := newThrottledUpgradeAwareProxyHandler(location, transport, false, true, responder)
	if utilfeature.DefaultFeatureGate.Enabled(features.PortForwardWebsockets) {
		tunnelingHandler := translator.NewTunnelingHandler(handler)
		handler = translator.NewTranslatingHandler(handler, tunnelingHandler, wsstream.IsWebSocketRequestWithTunnelingProtocol)
	}
	return handler, nil
}

	// owner: @seans3
	// kep: http://kep.k8s.io/4006
	// alpha: v1.30
	//
	// Enables PortForward to be proxied with a websocket client
	PortForwardWebsockets featuregate.Feature = "PortForwardWebsockets"

	// owner: @jessfraz
	// alpha: v1.12
	//
	// Enables control over ProcMountType for containers.
	ProcMountType featuregate.Feature = "ProcMountType"

	// owner: @sjenning

   ([#123413](https://github.com/kubernetes/kubernetes/pull/123413), [@seans3](https://github.com/seans3))