func (z *ZtunnelConnection) sendDataAndWaitForAck(data []byte, fd *int) (*zdsapi.WorkloadResponse, error) {
	var rights []byte
	if fd != nil {
		rights = unix.UnixRights(*fd)
	}
	err := z.u.SetWriteDeadline(time.Now().Add(readWriteDeadline))
	if err != nil {
		return nil, err
	}

	_, _, err = z.u.WriteMsgUnix(data, rights, nil)
	if err != nil {
		return nil, err
	}

	// wait for ack

metadata:
  name: valid-virtual-service
spec:
  hosts:
    - c
  http:
    - route:
      - destination:
          host: c
          subset: v1
        weight: 75
      - destination:
          host: c
          subset: v2
        weight: 25`
	validVirtualServiceJSON = `{
"apiVersion": "networking.istio.io/v1alpha3",
"kind": "VirtualService",
"metadata": {
	"name": "valid-virtual-service"
},