core/src/main/java/io/fabric8/maven/core/util/kubernetes/ServiceUrlUtil.java
public static String getServiceURL(KubernetesClient client, String serviceName, String serviceNamespace, String serviceProtocol, boolean serviceExternal) {
        Service srv = null;
        String serviceHost = serviceToHostOrBlank(serviceName);
        String servicePort = serviceToPortOrBlank(serviceName);
        String serviceProto = serviceProtocol != null ? serviceProtocol : serviceToProtocol(serviceName, servicePort);

        //Use specified or fallback namespace.
        String actualNamespace = StringUtils.isNotBlank(serviceNamespace) ? serviceNamespace : client.getNamespace();

        //1. Inside Kubernetes: Services as ENV vars
        if (!serviceExternal && StringUtils.isNotBlank(serviceHost) && StringUtils.isNotBlank(servicePort) && StringUtils.isNotBlank(serviceProtocol)) {
            return serviceProtocol + "://" + serviceHost + ":" + servicePort;
            //2. Anywhere: When namespace is passed System / Env var. Mostly needed for integration tests.
        } else if (StringUtils.isNotBlank(actualNamespace)) {
            srv = client.services().inNamespace(actualNamespace).withName(serviceName).get();
        }

        if (srv == null) {
            // lets try use environment variables
            String hostAndPort = getServiceHostAndPort(serviceName, "", "");
            if (!hostAndPort.startsWith(":")) {
                return serviceProto + "://" + hostAndPort;
            }
        }
        if (srv == null) {
            throw new IllegalArgumentException("No kubernetes service could be found for name: " + serviceName + " in namespace: " + actualNamespace);
        }

        String answer = KubernetesHelper.getOrCreateAnnotations(srv).get(Fabric8Annotations.SERVICE_EXPOSE_URL.toString());
        if (StringUtils.isNotBlank(answer)) {
            return answer;
        }

        if (OpenshiftHelper.isOpenShift(client)) {
            OpenShiftClient openShiftClient = client.adapt(OpenShiftClient.class);
            Route route = openShiftClient.routes().inNamespace(actualNamespace).withName(serviceName).get();
            if (route != null) {
                return (serviceProto + "://" + route.getSpec().getHost()).toLowerCase();
            }
        }

        ServicePort port = findServicePortByName(srv, null);
        if (port == null) {
            throw new RuntimeException("Couldn't find port: " + null + " for service:" + serviceName);
        }

        String clusterIP = srv.getSpec().getClusterIP();
        if ("None".equals(clusterIP)) {
            throw new IllegalStateException("Service: " + serviceName + " in namespace:" + serviceNamespace + "is head-less. Search for endpoints instead.");
        }

        Integer portNumber = port.getPort();
        if (StringUtils.isBlank(clusterIP)) {
            IngressList ingresses = client.extensions().ingresses().inNamespace(serviceNamespace).list();
            if (ingresses != null) {
                List<Ingress> items = ingresses.getItems();
                if (items != null) {
                    for (Ingress item : items) {
                        String ns = KubernetesHelper.getNamespace(item);
                        if (Objects.equal(serviceNamespace, ns)) {
                            IngressSpec spec = item.getSpec();
                            if (spec != null) {
                                List<IngressRule> rules = spec.getRules();
                                List<IngressTLS> tls = spec.getTls();
                                if (rules != null) {
                                    for (IngressRule rule : rules) {
                                        HTTPIngressRuleValue http = rule.getHttp();
                                        if (http != null) {
                                            List<HTTPIngressPath> paths = http.getPaths();
                                            if (paths != null) {
                                                for (HTTPIngressPath path : paths) {
                                                    IngressBackend backend = path.getBackend();
                                                    if (backend != null) {
                                                        String backendServiceName = backend.getServiceName();
                                                        if (serviceName.equals(backendServiceName) && portsMatch(port, backend.getServicePort())) {
                                                            String pathPostfix = path.getPath();
                                                            if (tls != null) {
                                                                for (IngressTLS tlsHost : tls) {
                                                                    List<String> hosts = tlsHost.getHosts();
                                                                    if (hosts != null) {
                                                                        for (String host : hosts) {
                                                                            if (StringUtils.isNotBlank(host)) {
                                                                                return String.format("https://%s/%s", host, preparePath(pathPostfix));
                                                                            }
                                                                        }
                                                                    }
                                                                }
                                                            }
                                                            answer = rule.getHost();
                                                            if (StringUtils.isNotBlank(answer)) {
                                                                return String.format("http://%s/%s",answer, preparePath(pathPostfix));
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }

            // lets try use the status on GKE
            ServiceStatus status = srv.getStatus();
            if (status != null) {
                LoadBalancerStatus loadBalancerStatus = status.getLoadBalancer();
                if (loadBalancerStatus != null) {
                    List<LoadBalancerIngress> loadBalancerIngresses = loadBalancerStatus.getIngress();
                    if (loadBalancerIngresses != null) {
                        for (LoadBalancerIngress loadBalancerIngress : loadBalancerIngresses) {
                            String ip = loadBalancerIngress.getIp();
                            if (StringUtils.isNotBlank(ip)) {
                                clusterIP = ip;
                                break;
                            }
                        }
                    }
                }
            }
        }

        if (StringUtils.isBlank(clusterIP)) {
            // on vanilla kubernetes we can use nodePort to access things externally
            boolean found = false;
            Integer nodePort = port.getNodePort();
            if (nodePort != null) {
                NodeList nodeList = client.nodes().list();
                if (nodeList != null) {
                    List<Node> items = nodeList.getItems();
                    if (items != null) {
                        for (Node item : items) {
                            NodeStatus status = item.getStatus();
                            if (!found && status != null) {
                                List<NodeAddress> addresses = status.getAddresses();
                                if (addresses != null) {
                                    for (NodeAddress address : addresses) {
                                        String ip = address.getAddress();
                                        if (StringUtils.isNotBlank(ip)) {
                                            clusterIP = ip;
                                            portNumber = nodePort;
                                            found = true;
                                            break;
                                        }

                                    }

                                }
                            }
                            if (!found) {
                                NodeSpec spec = item.getSpec();
                                if (spec != null) {
                                    clusterIP = spec.getExternalID();
                                    if (StringUtils.isNotBlank(clusterIP)) {
                                        portNumber = nodePort;
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        return (serviceProto + "://" + clusterIP + ":" + portNumber).toLowerCase();
    }
public static String getServiceURL(KubernetesClient client, String serviceName, String serviceNamespace, String serviceProtocol, boolean serviceExternal) {
        Service srv = null;
        String serviceHost = serviceToHostOrBlank(serviceName);
        String servicePort = serviceToPortOrBlank(serviceName);
        String serviceProto = serviceProtocol != null ? serviceProtocol : serviceToProtocol(serviceName, servicePort);

        //Use specified or fallback namespace.
        String actualNamespace = StringUtils.isNotBlank(serviceNamespace) ? serviceNamespace : client.getNamespace();

        //1. Inside Kubernetes: Services as ENV vars
        if (!serviceExternal && StringUtils.isNotBlank(serviceHost) && StringUtils.isNotBlank(servicePort) && StringUtils.isNotBlank(serviceProtocol)) {
            return serviceProtocol + "://" + serviceHost + ":" + servicePort;
            //2. Anywhere: When namespace is passed System / Env var. Mostly needed for integration tests.
        } else if (StringUtils.isNotBlank(actualNamespace)) {
            srv = client.services().inNamespace(actualNamespace).withName(serviceName).get();
        }

        if (srv == null) {
            // lets try use environment variables
            String hostAndPort = getServiceHostAndPort(serviceName, "", "");
            if (!hostAndPort.startsWith(":")) {
                return serviceProto + "://" + hostAndPort;
            }
        }
        if (srv == null) {
            throw new IllegalArgumentException("No kubernetes service could be found for name: " + serviceName + " in namespace: " + actualNamespace);
        }

        String answer = KubernetesHelper.getOrCreateAnnotations(srv).get(Fabric8Annotations.SERVICE_EXPOSE_URL.toString());
        if (StringUtils.isNotBlank(answer)) {
            return answer;
        }

        if (OpenshiftHelper.isOpenShift(client)) {
            OpenShiftClient openShiftClient = client.adapt(OpenShiftClient.class);
            Route route = openShiftClient.routes().inNamespace(actualNamespace).withName(serviceName).get();
            if (route != null) {
                return (serviceProto + "://" + route.getSpec().getHost()).toLowerCase();
            }
        }

        ServicePort port = findServicePortByName(srv, null);
        if (port == null) {
            throw new RuntimeException("Couldn't find port: " + null + " for service:" + serviceName);
        }

        String clusterIP = srv.getSpec().getClusterIP();
        if ("None".equals(clusterIP)) {
            throw new IllegalStateException("Service: " + serviceName + " in namespace:" + serviceNamespace + "is head-less. Search for endpoints instead.");
        }

        Integer portNumber = port.getPort();
        if (StringUtils.isBlank(clusterIP)) {
            IngressList ingresses = client.extensions().ingresses().inNamespace(serviceNamespace).list();
            if (ingresses != null) {
                List<Ingress> items = ingresses.getItems();
                if (items != null) {
                    for (Ingress item : items) {
                        String ns = KubernetesHelper.getNamespace(item);
                        if (Objects.equal(serviceNamespace, ns)) {
                            IngressSpec spec = item.getSpec();
                            if (spec != null) {
                                List<IngressRule> rules = spec.getRules();
                                List<IngressTLS> tls = spec.getTls();
                                if (rules != null) {
                                    for (IngressRule rule : rules) {
                                        HTTPIngressRuleValue http = rule.getHttp();
                                        if (http != null) {
                                            List<HTTPIngressPath> paths = http.getPaths();
                                            if (paths != null) {
                                                for (HTTPIngressPath path : paths) {
                                                    IngressBackend backend = path.getBackend();
                                                    if (backend != null) {
                                                        String backendServiceName = backend.getServiceName();
                                                        if (serviceName.equals(backendServiceName) && portsMatch(port, backend.getServicePort())) {
                                                            String pathPostfix = path.getPath();
                                                            if (tls != null) {
                                                                for (IngressTLS tlsHost : tls) {
                                                                    List<String> hosts = tlsHost.getHosts();
                                                                    if (hosts != null) {
                                                                        for (String host : hosts) {
                                                                            if (StringUtils.isNotBlank(host)) {
                                                                                return String.format("https://%s/%s", host, preparePath(pathPostfix));
                                                                            }
                                                                        }
                                                                    }
                                                                }
                                                            }
                                                            answer = rule.getHost();
                                                            if (StringUtils.isNotBlank(answer)) {
                                                                return String.format("http://%s/%s",answer, preparePath(pathPostfix));
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }

            // lets try use the status on GKE
            ServiceStatus status = srv.getStatus();
            if (status != null) {
                LoadBalancerStatus loadBalancerStatus = status.getLoadBalancer();
                if (loadBalancerStatus != null) {
                    List<LoadBalancerIngress> loadBalancerIngresses = loadBalancerStatus.getIngress();
                    if (loadBalancerIngresses != null) {
                        for (LoadBalancerIngress loadBalancerIngress : loadBalancerIngresses) {
                            String ip = loadBalancerIngress.getIp();
                            if (StringUtils.isNotBlank(ip)) {
                                clusterIP = ip;
                                break;
                            }
                        }
                    }
                }
            }
        }

        if (StringUtils.isBlank(clusterIP)) {
            // on vanilla kubernetes we can use nodePort to access things externally
            boolean found = false;
            Integer nodePort = port.getNodePort();
            if (nodePort != null) {
                NodeList nodeList = client.nodes().list();
                if (nodeList != null) {
                    List<Node> items = nodeList.getItems();
                    if (items != null) {
                        for (Node item : items) {
                            NodeStatus status = item.getStatus();
                            if (!found && status != null) {
                                List<NodeAddress> addresses = status.getAddresses();
                                if (addresses != null) {
                                    for (NodeAddress address : addresses) {
                                        String ip = address.getAddress();
                                        if (StringUtils.isNotBlank(ip)) {
                                            clusterIP = ip;
                                            portNumber = nodePort;
                                            found = true;
                                            break;
                                        }

                                    }

                                }
                            }
                            if (!found) {
                                NodeSpec spec = item.getSpec();
                                if (spec != null) {
                                    clusterIP = spec.getExternalID();
                                    if (StringUtils.isNotBlank(clusterIP)) {
                                        portNumber = nodePort;
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
        return (serviceProto + "://" + clusterIP + ":" + portNumber).toLowerCase();
    }
Returns the URL to access the service; using the environment variables, routes
or service clusterIP address

@throws IllegalArgumentException if the URL cannot be found for the serviceName and namespace