apiVersion: v1
kind: Service
metadata:
  name: hello
spec:
  ports:
    - appProtocol: http
      port: 9080`
	validPortNamingSvcWithAppProtocol2 = `
apiVersion: v1
kind: Service
metadata:
  name: hello
spec:
  ports:
    - appProtocol: http
      name: fake # should not have error since the appProtocol field
      port: 9080`
	inValidPortNamingSvcWithAppProtocol = `
apiVersion: v1

  // port represents the port number of the endpoint.
  // If this is not specified, ports are not restricted and must be
  // interpreted in the context of the specific consumer.
  optional int32 port = 3;

  // appProtocol represents the application protocol for this port.
  // This field follows standard Kubernetes label syntax.
  // Un-prefixed names are reserved for IANA standard service names (as per

	var protocol string
	if port.Name == "" && port.AppProtocol == nil && port.Protocol != corev1.ProtocolUDP {
		protocol = "auto-detect"
	} else {
		protocol = string(configKube.ConvertProtocol(port.Port, port.Name, port.Protocol, port.AppProtocol))
		if protocol == protocolinstance.Unsupported.String() && port.AppProtocol != nil && *port.AppProtocol == "hbone" {
			// HBONE is used for some internal code.

  //
  // * Other protocols should use implementation-defined prefixed names such as
  // mycompany.com/my-custom-protocol.
  // +optional
  optional string appProtocol = 4;
}

// EndpointSlice represents a subset of the endpoints that implement a service.
// For a given service there may be multiple EndpointSlice objects, selected by

		},
		{
			port: corev1.ServicePort{
				Name:     "GRPC-port",
				Protocol: corev1.ProtocolTCP,
			},
			expectedProtocol: "GRPC",
		},
		{
			port: corev1.ServicePort{
				AppProtocol: &http,
				Protocol:    corev1.ProtocolTCP,
			},
			expectedProtocol: "HTTP",
		},
		{
			port: corev1.ServicePort{
				Protocol: corev1.ProtocolTCP,
				Port:     80,
			},

		for _, port := range ports {
			p := port.(map[string]any)
			if p["protocol"] != nil && strings.EqualFold(p["protocol"].(string), serviceProtocolUDP) {
				continue
			}
			if ap := p["appProtocol"]; ap != nil {
				if protocol.Parse(ap.(string)).IsUnsupported() {
					errs = multierror.Append(errs, fmt.Errorf("service %q doesn't follow Istio protocol selection. "+

- Remove `kubernetes.io/grpc` standard appProtocol ([#116866](https://github.com/kubernetes/kubernetes/pull/116866), [@LiorLieberman](https://github.com/LiorLieberman)) [SIG API Machinery and Apps]

  //
  // * Other protocols should use implementation-defined prefixed names such as
  // mycompany.com/my-custom-protocol.
  // +optional
  optional string appProtocol = 4;
}

// EndpointSubset is a group of addresses with a common set of ports. The
// expanded set of endpoints is the Cartesian product of Addresses x Ports.
// For example, given:
//
// 	{

- Splitting IP address type into IPv4 and IPv6 for EndpointSlices ([#84971](https://github.com/kubernetes/kubernetes/pull/84971), [@robscott](https://github.com/robscott))
- Added appProtocol field to EndpointSlice Port ([#83815](https://github.com/kubernetes/kubernetes/pull/83815), [@howardjohn](https://github.com/howardjohn))

- The alpha feature `ServiceAppProtocol` enables setting an `appProtocol` field in ServicePort and EndpointPort definitions. ([#88503](https://github.com/kubernetes/kubernetes/pull/88503), [@robscott](https://github.com/robscott)) [SIG Apps and Network]