Pod proxy, exec and portforward subresources

pkg/master/master.go

@@ -387,11 +387,14 @@ func (m *Master) init(c *Config) {
 
 	// TODO: Factor out the core API registration
 	m.storage = map[string]rest.Storage{
-		"pods":         podStorage.Pod,
-		"pods/status":  podStorage.Status,
-		"pods/log":     podStorage.Log,
-		"pods/binding": podStorage.Binding,
-		"bindings":     podStorage.Binding,
+		"pods":             podStorage.Pod,
+		"pods/status":      podStorage.Status,
+		"pods/log":         podStorage.Log,
+		"pods/exec":        podStorage.Exec,
+		"pods/portforward": podStorage.PortForward,
+		"pods/proxy":       podStorage.Proxy,
+		"pods/binding":     podStorage.Binding,
+		"bindings":         podStorage.Binding,
 
 		"replicationControllers": controllerStorage,
 		"services":               service.NewStorage(m.serviceRegistry, m.nodeRegistry, m.endpointRegistry, m.portalNet, c.ClusterName),

pkg/registry/generic/rest/proxy.go

+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package rest
+
+import (
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/httpstream"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/proxy"
+
+	"github.com/GoogleCloudPlatform/kubernetes/third_party/golang/netutil"
+	"github.com/golang/glog"
+)
+
+// UpgradeAwareProxyHandler is a handler for proxy requests that may require an upgrade
+type UpgradeAwareProxyHandler struct {
+	UpgradeRequired bool
+	Location        *url.URL
+	Transport       http.RoundTripper
+	FlushInterval   time.Duration
+	err             error
+}
+
+const defaultFlushInterval = 200 * time.Millisecond
+
+// NewUpgradeAwareProxyHandler creates a new proxy handler with a default flush interval
+func NewUpgradeAwareProxyHandler(location *url.URL, transport http.RoundTripper, upgradeRequired bool) *UpgradeAwareProxyHandler {
+	return &UpgradeAwareProxyHandler{
+		Location:        location,
+		Transport:       transport,
+		UpgradeRequired: upgradeRequired,
+		FlushInterval:   defaultFlushInterval,
+	}
+}
+
+// RequestError returns an error that occurred while handling request
+func (h *UpgradeAwareProxyHandler) RequestError() error {
+	return h.err
+}
+
+// ServeHTTP handles the proxy request
+func (h *UpgradeAwareProxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	h.err = nil
+	if len(h.Location.Scheme) == 0 {
+		h.Location.Scheme = "http"
+	}
+	if h.tryUpgrade(w, req) {
+		return
+	}
+	if h.UpgradeRequired {
+		h.err = errors.NewBadRequest("Upgrade request required")
+		return
+	}
+
+	if h.Transport == nil {
+		h.Transport = h.defaultProxyTransport(req.URL)
+	}
+
+	loc := *h.Location
+	loc.RawQuery = req.URL.RawQuery
+	newReq, err := http.NewRequest(req.Method, loc.String(), req.Body)
+	if err != nil {
+		h.err = err
+		return
+	}
+	newReq.Header = req.Header
+
+	proxy := httputil.NewSingleHostReverseProxy(&url.URL{Scheme: h.Location.Scheme, Host: h.Location.Host})
+	proxy.Transport = h.Transport
+	proxy.FlushInterval = h.FlushInterval
+	proxy.ServeHTTP(w, newReq)
+}
+
+// tryUpgrade returns true if the request was handled.
+func (h *UpgradeAwareProxyHandler) tryUpgrade(w http.ResponseWriter, req *http.Request) bool {
+	if !httpstream.IsUpgradeRequest(req) {
+		return false
+	}
+
+	backendConn, err := h.dialURL()
+	if err != nil {
+		h.err = err
+		return true
+	}
+	defer backendConn.Close()
+
+	requestHijackedConn, _, err := w.(http.Hijacker).Hijack()
+	if err != nil {
+		h.err = err
+		return true
+	}
+	defer requestHijackedConn.Close()
+
+	newReq, err := http.NewRequest(req.Method, h.Location.String(), req.Body)
+	if err != nil {
+		h.err = err
+		return true
+	}
+	newReq.Header = req.Header
+
+	if err = newReq.Write(backendConn); err != nil {
+		h.err = err
+		return true
+	}
+
+	wg := &sync.WaitGroup{}
+	wg.Add(2)
+
+	go func() {
+		_, err := io.Copy(backendConn, requestHijackedConn)
+		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
+			glog.Errorf("Error proxying data from client to backend: %v", err)
+		}
+		wg.Done()
+	}()
+
+	go func() {
+		_, err := io.Copy(requestHijackedConn, backendConn)
+		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
+			glog.Errorf("Error proxying data from backend to client: %v", err)
+		}
+		wg.Done()
+	}()
+
+	wg.Wait()
+	return true
+}
+
+func (h *UpgradeAwareProxyHandler) dialURL() (net.Conn, error) {
+	dialAddr := netutil.CanonicalAddr(h.Location)
+
+	switch h.Location.Scheme {
+	case "http":
+		return net.Dial("tcp", dialAddr)
+	case "https":
+		// Get the tls config from the transport if we recognize it
+		var tlsConfig *tls.Config
+		if h.Transport != nil {
+			httpTransport, ok := h.Transport.(*http.Transport)
+			if ok {
+				tlsConfig = httpTransport.TLSClientConfig
+			}
+		}
+
+		// Dial
+		tlsConn, err := tls.Dial("tcp", dialAddr, tlsConfig)
+		if err != nil {
+			return nil, err
+		}
+
+		// Verify
+		host, _, _ := net.SplitHostPort(dialAddr)
+		if err := tlsConn.VerifyHostname(host); err != nil {
+			tlsConn.Close()
+			return nil, err
+		}
+
+		return tlsConn, nil
+	default:
+		return nil, fmt.Errorf("Unknown scheme: %s", h.Location.Scheme)
+	}
+}
+
+func (h *UpgradeAwareProxyHandler) defaultProxyTransport(url *url.URL) http.RoundTripper {
+	scheme := url.Scheme
+	host := url.Host
+	pathPrepend := strings.TrimRight(url.Path, h.Location.Path)
+	return &proxy.Transport{
+		Scheme:      scheme,
+		Host:        host,
+		PathPrepend: pathPrepend,
+	}
+}

pkg/registry/generic/rest/proxy_test.go

+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package rest
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+
+	"golang.org/x/net/websocket"
+)
+
+type SimpleBackendHandler struct {
+	requestURL     url.URL
+	requestHeader  http.Header
+	requestBody    []byte
+	requestMethod  string
+	responseBody   string
+	responseHeader map[string]string
+	t              *testing.T
+}
+
+func (s *SimpleBackendHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	s.requestURL = *req.URL
+	s.requestHeader = req.Header
+	s.requestMethod = req.Method
+	var err error
+	s.requestBody, err = ioutil.ReadAll(req.Body)
+	if err != nil {
+		s.t.Errorf("Unexpected error: %v", err)
+		return
+	}
+
+	for k, v := range s.responseHeader {
+		w.Header().Add(k, v)
+	}
+	w.Write([]byte(s.responseBody))
+}
+
+func validateParameters(t *testing.T, name string, actual url.Values, expected map[string]string) {
+	for k, v := range expected {
+		actualValue, ok := actual[k]
+		if !ok {
+			t.Errorf("%s: Expected parameter %s not received", name, k)
+			continue
+		}
+		if actualValue[0] != v {
+			t.Errorf("%s: Parameter %s values don't match. Actual: %#v, Expected: %s",
+				name, k, actualValue, v)
+		}
+	}
+}
+
+func validateHeaders(t *testing.T, name string, actual http.Header, expected map[string]string) {
+	for k, v := range expected {
+		actualValue, ok := actual[k]
+		if !ok {
+			t.Errorf("%s: Expected header %s not received", name, k)
+			continue
+		}
+		if actualValue[0] != v {
+			t.Errorf("%s: Header %s values don't match. Actual: %s, Expected: %s",
+				name, k, actualValue, v)
+		}
+	}
+}
+
+func TestServeHTTP(t *testing.T) {
+	tests := []struct {
+		name          string
+		method        string
+		requestPath   string
+		requestBody   string
+		requestParams map[string]string
+		requestHeader map[string]string
+	}{
+		{
+			name:        "root path, simple get",
+			method:      "GET",
+			requestPath: "/",
+		},
+		{
+			name:        "simple path, get",
+			method:      "GET",
+			requestPath: "/path/to/test",
+		},
+		{
+			name:          "request params",
+			method:        "POST",
+			requestPath:   "/some/path",
+			requestParams: map[string]string{"param1": "value/1", "param2": "value%2"},
+			requestBody:   "test request body",
+		},
+		{
+			name:          "request headers",
+			method:        "PUT",
+			requestPath:   "/some/path",
+			requestHeader: map[string]string{"Header1": "value1", "Header2": "value2"},
+		},
+	}
+
+	for _, test := range tests {
+		func() {
+			backendResponse := "<html><head></head><body><a href=\"/test/path\">Hello</a></body></html>"
+			backendHandler := &SimpleBackendHandler{
+				responseBody:   backendResponse,
+				responseHeader: map[string]string{"Content-Type": "text/html"},
+			}
+			backendServer := httptest.NewServer(backendHandler)
+			defer backendServer.Close()
+
+			backendURL, _ := url.Parse(backendServer.URL)
+			backendURL.Path = test.requestPath
+			proxyHandler := &UpgradeAwareProxyHandler{
+				Location: backendURL,
+			}
+			proxyServer := httptest.NewServer(proxyHandler)
+			defer proxyServer.Close()
+			proxyURL, _ := url.Parse(proxyServer.URL)
+			proxyURL.Path = test.requestPath
+			paramValues := url.Values{}
+			for k, v := range test.requestParams {
+				paramValues[k] = []string{v}
+			}
+			proxyURL.RawQuery = paramValues.Encode()
+			var requestBody io.Reader
+			if test.requestBody != "" {
+				requestBody = bytes.NewBufferString(test.requestBody)
+			}
+			req, err := http.NewRequest(test.method, proxyURL.String(), requestBody)
+			if test.requestHeader != nil {
+				header := http.Header{}
+				for k, v := range test.requestHeader {
+					header.Add(k, v)
+				}
+				req.Header = header
+			}
+			if err != nil {
+				t.Errorf("Error creating client request: %v", err)
+			}
+			client := &http.Client{}
+			res, err := client.Do(req)
+			if err != nil {
+				t.Errorf("Error from proxy request: %v", err)
+			}
+
+			// Validate backend request
+			// Method
+			if backendHandler.requestMethod != test.method {
+				t.Errorf("Unexpected request method: %s. Expected: %s",
+					backendHandler.requestMethod, test.method)
+			}
+
+			// Body
+			if string(backendHandler.requestBody) != test.requestBody {
+				t.Errorf("Unexpected request body: %s. Expected: %s",
+					string(backendHandler.requestBody), test.requestBody)
+			}
+
+			// Path
+			if backendHandler.requestURL.Path != test.requestPath {
+				t.Errorf("Unexpected request path: %s", backendHandler.requestURL.Path)
+			}
+			// Parameters
+			validateParameters(t, test.name, backendHandler.requestURL.Query(), test.requestParams)
+
+			// Headers
+			validateHeaders(t, test.name+" backend request", backendHandler.requestHeader,
+				test.requestHeader)
+
+			// Validate proxy response
+			// Validate Body
+			responseBody, err := ioutil.ReadAll(res.Body)
+			if err != nil {
+				t.Errorf("Unexpected error reading response body: %v", err)
+			}
+			if rb := string(responseBody); rb != backendResponse {
+				t.Errorf("Did not get expected response body: %s. Expected: %s", rb, backendResponse)
+			}
+
+			// Error
+			err = proxyHandler.RequestError()
+			if err != nil {
+				t.Errorf("Unexpected proxy handler error: %v", err)
+			}
+		}()
+	}
+}
+
+func TestProxyUpgrade(t *testing.T) {
+	backendServer := httptest.NewServer(websocket.Handler(func(ws *websocket.Conn) {
+		defer ws.Close()
+		body := make([]byte, 5)
+		ws.Read(body)
+		ws.Write([]byte("hello " + string(body)))
+	}))
+	defer backendServer.Close()
+
+	serverURL, _ := url.Parse(backendServer.URL)
+	proxyHandler := &UpgradeAwareProxyHandler{
+		Location: serverURL,
+	}
+	proxy := httptest.NewServer(proxyHandler)
+	defer proxy.Close()
+
+	ws, err := websocket.Dial("ws://"+proxy.Listener.Addr().String()+"/some/path", "", "http://127.0.0.1/")
+	if err != nil {
+		t.Fatalf("websocket dial err: %s", err)
+	}
+	defer ws.Close()
+
+	if _, err := ws.Write([]byte("world")); err != nil {
+		t.Fatalf("write err: %s", err)
+	}
+
+	response := make([]byte, 20)
+	n, err := ws.Read(response)
+	if err != nil {
+		t.Fatalf("read err: %s", err)
+	}
+	if e, a := "hello world", string(response[0:n]); e != a {
+		t.Fatalf("expected '%#v', got '%#v'", e, a)
+	}
+}

pkg/registry/pod/etcd/etcd.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/url"
+	"path"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
@@ -39,10 +40,13 @@ import (
 
 // PodStorage includes storage for pods and all sub resources
 type PodStorage struct {
-	Pod     *REST
-	Binding *BindingREST
-	Status  *StatusREST
-	Log     *LogREST
+	Pod         *REST
+	Binding     *BindingREST
+	Status      *StatusREST
+	Log         *LogREST
+	Proxy       *ProxyREST
+	Exec        *ExecREST
+	PortForward *PortForwardREST
 }
 
 // REST implements a RESTStorage for pods against etcd
@@ -85,10 +89,13 @@ func NewStorage(h tools.EtcdHelper, k client.ConnectionInfoGetter) PodStorage {
 	statusStore.UpdateStrategy = pod.StatusStrategy
 
 	return PodStorage{
-		Pod:     &REST{*store},
-		Binding: &BindingREST{store: store},
-		Status:  &StatusREST{store: &statusStore},
-		Log:     &LogREST{store: store, kubeletConn: k},
+		Pod:         &REST{*store},
+		Binding:     &BindingREST{store: store},
+		Status:      &StatusREST{store: &statusStore},
+		Log:         &LogREST{store: store, kubeletConn: k},
+		Proxy:       &ProxyREST{store: store},
+		Exec:        &ExecREST{store: store, kubeletConn: k},
+		PortForward: &PortForwardREST{store: store, kubeletConn: k},
 	}
 }
 
@@ -193,6 +200,9 @@ func (r *StatusREST) Update(ctx api.Context, obj runtime.Object) (runtime.Object
 	return r.store.Update(ctx, obj)
 }
 
+// Implement GetterWithOptions
+var _ = rest.GetterWithOptions(&LogREST{})
+
 // LogREST implements the log endpoint for a Pod
 type LogREST struct {
 	store       *etcdgeneric.Etcd
@@ -230,3 +240,114 @@ func (r *LogREST) Get(ctx api.Context, name string, opts runtime.Object) (runtim
 func (r *LogREST) NewGetOptions() (runtime.Object, bool, string) {
 	return &api.PodLogOptions{}, false, ""
 }
+
+// ProxyREST implements the proxy subresource for a Pod
+type ProxyREST struct {
+	store *etcdgeneric.Etcd
+}
+
+// Implement Connecter
+var _ = rest.Connecter(&ProxyREST{})
+
+var proxyMethods = []string{"GET", "POST", "PUT", "DELETE", "HEAD", "OPTIONS"}
+
+// New returns an empty pod resource
+func (r *ProxyREST) New() runtime.Object {
+	return &api.Pod{}
+}
+
+// ConnectMethods returns the list of HTTP methods that can be proxied
+func (r *ProxyREST) ConnectMethods() []string {
+	return proxyMethods
+}
+
+// NewConnectOptions returns versioned resource that represents proxy parameters
+func (r *ProxyREST) NewConnectOptions() (runtime.Object, bool, string) {
+	return &api.PodProxyOptions{}, true, "path"
+}
+
+// Connect returns a handler for the pod proxy
+func (r *ProxyREST) Connect(ctx api.Context, id string, opts runtime.Object) (rest.ConnectHandler, error) {
+	proxyOpts, ok := opts.(*api.PodProxyOptions)
+	if !ok {
+		return nil, fmt.Errorf("Invalid options object: %#v", opts)
+	}
+	location, _, err := pod.ResourceLocation(r.store, ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	location.Path = path.Join(location.Path, proxyOpts.Path)
+	return genericrest.NewUpgradeAwareProxyHandler(location, nil, false), nil
+}
+
+var upgradeableMethods = []string{"GET"}
+
+// ExecREST implements the exec subresource for a Pod
+type ExecREST struct {
+	store       *etcdgeneric.Etcd
+	kubeletConn client.ConnectionInfoGetter
+}
+
+// Implement Connecter
+var _ = rest.Connecter(&ExecREST{})
+
+// New creates a new Pod object
+func (r *ExecREST) New() runtime.Object {
+	return &api.Pod{}
+}
+
+// Connect returns a handler for the pod exec proxy
+func (r *ExecREST) Connect(ctx api.Context, name string, opts runtime.Object) (rest.ConnectHandler, error) {
+	execOpts, ok := opts.(*api.PodExecOptions)
+	if !ok {
+		return nil, fmt.Errorf("Invalid options object: %#v", opts)
+	}
+	location, transport, err := pod.ExecLocation(r.store, r.kubeletConn, ctx, name, execOpts)
+	if err != nil {
+		return nil, err
+	}
+	return genericrest.NewUpgradeAwareProxyHandler(location, transport, true), nil
+}
+
+// NewConnectOptions returns the versioned object that represents exec parameters
+func (r *ExecREST) NewConnectOptions() (runtime.Object, bool, string) {
+	return &api.PodExecOptions{}, false, ""
+}
+
+// ConnectMethods returns the methods supported by exec
+func (r *ExecREST) ConnectMethods() []string {
+	return upgradeableMethods
+}
+
+// PortForwardREST implements the portforward subresource for a Pod
+type PortForwardREST struct {
+	store       *etcdgeneric.Etcd
+	kubeletConn client.ConnectionInfoGetter
+}
+
+// Implement Connecter
+var _ = rest.Connecter(&PortForwardREST{})
+
+// New returns an empty pod object
+func (r *PortForwardREST) New() runtime.Object {
+	return &api.Pod{}
+}
+
+// NewConnectOptions returns nil since portforward doesn't take additional parameters
+func (r *PortForwardREST) NewConnectOptions() (runtime.Object, bool, string) {
+	return nil, false, ""
+}
+
+// ConnectMethods returns the methods supported by portforward
+func (r *PortForwardREST) ConnectMethods() []string {
+	return upgradeableMethods
+}
+
+// Connect returns a handler for the pod portforward proxy
+func (r *PortForwardREST) Connect(ctx api.Context, name string, opts runtime.Object) (rest.ConnectHandler, error) {
+	location, transport, err := pod.PortForwardLocation(r.store, r.kubeletConn, ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	return genericrest.NewUpgradeAwareProxyHandler(location, transport, true), nil
+}

pkg/registry/pod/rest.go

@@ -202,7 +202,7 @@ func LogLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ct
 		if len(pod.Spec.Containers) == 1 {
 			container = pod.Spec.Containers[0].Name
 		} else {
-			return nil, nil, fmt.Errorf("a container name must be specified for pod %s", name)
+			return nil, nil, errors.NewBadRequest(fmt.Sprintf("a container name must be specified for pod %s", name))
 		}
 	}
 	nodeHost := pod.Status.HostIP
@@ -226,3 +226,78 @@ func LogLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ct
 	}
 	return loc, nodeTransport, nil
 }
+
+// ExecLocation returns the exec URL for a pod container. If opts.Container is blank
+// and only one container is present in the pod, that container is used.
+func ExecLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ctx api.Context, name string, opts *api.PodExecOptions) (*url.URL, http.RoundTripper, error) {
+
+	pod, err := getPod(getter, ctx, name)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Try to figure out a container
+	container := opts.Container
+	if container == "" {
+		if len(pod.Spec.Containers) == 1 {
+			container = pod.Spec.Containers[0].Name
+		} else {
+			return nil, nil, errors.NewBadRequest(fmt.Sprintf("a container name must be specified for pod %s", name))
+		}
+	}
+	nodeHost := pod.Status.HostIP
+	if len(nodeHost) == 0 {
+		// If pod has not been assigned a host, return an empty location
+		return nil, nil, fmt.Errorf("pod %s does not have a host assigned", name)
+	}
+	nodeScheme, nodePort, nodeTransport, err := connInfo.GetConnectionInfo(nodeHost)
+	if err != nil {
+		return nil, nil, err
+	}
+	params := url.Values{}
+	if opts.Stdin {
+		params.Add(api.ExecStdinParam, "1")
+	}
+	if opts.Stdout {
+		params.Add(api.ExecStdoutParam, "1")
+	}
+	if opts.Stderr {
+		params.Add(api.ExecStderrParam, "1")
+	}
+	if opts.TTY {
+		params.Add(api.ExecTTYParam, "1")
+	}
+	params.Add("command", opts.Command)
+	loc := &url.URL{
+		Scheme:   nodeScheme,
+		Host:     fmt.Sprintf("%s:%d", nodeHost, nodePort),
+		Path:     fmt.Sprintf("/exec/%s/%s/%s", pod.Namespace, name, container),
+		RawQuery: params.Encode(),
+	}
+	return loc, nodeTransport, nil
+}
+
+// PortForwardLocation returns a the port-forward URL for a pod.
+func PortForwardLocation(getter ResourceGetter, connInfo client.ConnectionInfoGetter, ctx api.Context, name string) (*url.URL, http.RoundTripper, error) {
+
+	pod, err := getPod(getter, ctx, name)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	nodeHost := pod.Status.HostIP
+	if len(nodeHost) == 0 {
+		// If pod has not been assigned a host, return an empty location
+		return nil, nil, errors.NewBadRequest(fmt.Sprintf("pod %s does not have a host assigned", name))
+	}
+	nodeScheme, nodePort, nodeTransport, err := connInfo.GetConnectionInfo(nodeHost)
+	if err != nil {
+		return nil, nil, err
+	}
+	loc := &url.URL{
+		Scheme: nodeScheme,
+		Host:   fmt.Sprintf("%s:%d", nodeHost, nodePort),
+		Path:   fmt.Sprintf("/portForward/%s/%s", pod.Namespace, name),
+	}
+	return loc, nodeTransport, nil
+}