diff --git a/cluster/addons/dns/kube2sky/kube2sky.go b/cluster/addons/dns/kube2sky/kube2sky.go
index 922fe6b685d..9983e197966 100644
--- a/cluster/addons/dns/kube2sky/kube2sky.go
+++ b/cluster/addons/dns/kube2sky/kube2sky.go
@@ -481,8 +481,8 @@ func newKubeClient() (*kclient.Client, error) {
 	if masterURL != "" && *argKubecfgFile == "" {
 		// Only --kube-master-url was provided.
 		config = &kclient.Config{
-			Host:         masterURL,
-			GroupVersion: &unversioned.GroupVersion{Version: "v1"},
+			Host:          masterURL,
+			ContentConfig: kclient.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: "v1"}},
 		}
 	} else {
 		// We either have:
diff --git a/cmd/integration/integration.go b/cmd/integration/integration.go
index ff07fd38e99..6bc3e639b8c 100644
--- a/cmd/integration/integration.go
+++ b/cmd/integration/integration.go
@@ -133,11 +133,11 @@ func startComponents(firstManifestURL, secondManifestURL string) (string, string
 		glog.Fatalf("Failed to connect to etcd")
 	}
 
-	cl := client.NewOrDie(&client.Config{Host: apiServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	cl := client.NewOrDie(&client.Config{Host: apiServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	// TODO: caesarxuchao: hacky way to specify version of Experimental client.
 	// We will fix this by supporting multiple group versions in Config
-	cl.ExtensionsClient = client.NewExtensionsOrDie(&client.Config{Host: apiServer.URL, GroupVersion: testapi.Extensions.GroupVersion()})
+	cl.ExtensionsClient = client.NewExtensionsOrDie(&client.Config{Host: apiServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Extensions.GroupVersion()}})
 
 	// Master
 	host, port, err := net.SplitHostPort(strings.TrimLeft(apiServer.URL, "http://"))
@@ -984,10 +984,10 @@ func main() {
 	// Wait for the synchronization threads to come up.
 	time.Sleep(time.Second * 10)
 
-	kubeClient := client.NewOrDie(&client.Config{Host: apiServerURL, GroupVersion: testapi.Default.GroupVersion()})
+	kubeClient := client.NewOrDie(&client.Config{Host: apiServerURL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	// TODO: caesarxuchao: hacky way to specify version of Experimental client.
 	// We will fix this by supporting multiple group versions in Config
-	kubeClient.ExtensionsClient = client.NewExtensionsOrDie(&client.Config{Host: apiServerURL, GroupVersion: testapi.Extensions.GroupVersion()})
+	kubeClient.ExtensionsClient = client.NewExtensionsOrDie(&client.Config{Host: apiServerURL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Extensions.GroupVersion()}})
 
 	// Run tests in parallel
 	testFuncs := []testFunc{
diff --git a/contrib/mesos/pkg/scheduler/integration/integration_test.go b/contrib/mesos/pkg/scheduler/integration/integration_test.go
index e00b09ce813..20828148025 100644
--- a/contrib/mesos/pkg/scheduler/integration/integration_test.go
+++ b/contrib/mesos/pkg/scheduler/integration/integration_test.go
@@ -489,8 +489,8 @@ func newLifecycleTest(t *testing.T) lifecycleTest {
 
 	// create framework
 	client := client.NewOrDie(&client.Config{
-		Host:         apiServer.server.URL,
-		GroupVersion: testapi.Default.GroupVersion(),
+		Host:          apiServer.server.URL,
+		ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()},
 	})
 	c := *schedcfg.CreateDefaultConfig()
 	fw := framework.New(framework.Config{
diff --git a/pkg/api/testapi/testapi.go b/pkg/api/testapi/testapi.go
index eb5cd8aa163..33b2e201fc8 100644
--- a/pkg/api/testapi/testapi.go
+++ b/pkg/api/testapi/testapi.go
@@ -79,6 +79,10 @@ func init() {
 	Extensions = Groups[extensions.GroupName]
 }
 
+func (g TestGroup) ContentConfig() (string, *unversioned.GroupVersion, runtime.Codec) {
+	return "application/json", g.GroupVersion(), g.Codec()
+}
+
 func (g TestGroup) GroupVersion() *unversioned.GroupVersion {
 	copyOfGroupVersion := g.externalGroupVersion
 	return &copyOfGroupVersion
diff --git a/pkg/client/cache/listwatch_test.go b/pkg/client/cache/listwatch_test.go
index 7e696125f35..a0a72f5d83b 100644
--- a/pkg/client/cache/listwatch_test.go
+++ b/pkg/client/cache/listwatch_test.go
@@ -97,7 +97,7 @@ func TestListWatchesCanList(t *testing.T) {
 		server := httptest.NewServer(&handler)
 		// TODO: Uncomment when fix #19254
 		// defer server.Close()
-		client := client.NewOrDie(&client.Config{Host: server.URL, GroupVersion: testapi.Default.GroupVersion()})
+		client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 		lw := NewListWatchFromClient(client, item.resource, item.namespace, item.fieldSelector)
 		// This test merely tests that the correct request is made.
 		lw.List(api.ListOptions{})
@@ -164,7 +164,7 @@ func TestListWatchesCanWatch(t *testing.T) {
 		server := httptest.NewServer(&handler)
 		// TODO: Uncomment when fix #19254
 		// defer server.Close()
-		client := client.NewOrDie(&client.Config{Host: server.URL, GroupVersion: testapi.Default.GroupVersion()})
+		client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 		lw := NewListWatchFromClient(client, item.resource, item.namespace, item.fieldSelector)
 		// This test merely tests that the correct request is made.
 		lw.Watch(api.ListOptions{ResourceVersion: item.rv})
diff --git a/pkg/client/unversioned/fake/fake.go b/pkg/client/unversioned/fake/fake.go
index d8b1bd4ccf0..2fad59cc1eb 100644
--- a/pkg/client/unversioned/fake/fake.go
+++ b/pkg/client/unversioned/fake/fake.go
@@ -70,7 +70,7 @@ func (c *RESTClient) Delete() *unversioned.Request {
 }
 
 func (c *RESTClient) request(verb string) *unversioned.Request {
-	return unversioned.NewRequest(c, verb, &url.URL{Host: "localhost"}, "", *testapi.Default.GroupVersion(), c.Codec, nil)
+	return unversioned.NewRequest(c, verb, &url.URL{Host: "localhost"}, "", unversioned.ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: c.Codec}, nil)
 }
 
 func (c *RESTClient) Do(req *http.Request) (*http.Response, error) {
diff --git a/pkg/client/unversioned/helper.go b/pkg/client/unversioned/helper.go
index fad07b60a76..40cfac01048 100644
--- a/pkg/client/unversioned/helper.go
+++ b/pkg/client/unversioned/helper.go
@@ -55,14 +55,13 @@ type Config struct {
 	Host string
 	// APIPath is a sub-path that points to an API root.
 	APIPath string
-	// GroupVersion is the API version to talk to. Must be provided when initializing
-	// a RESTClient directly. When initializing a Client, will be set with the default
-	// code version.
-	GroupVersion *unversioned.GroupVersion
-	// Codec specifies the encoding and decoding behavior for runtime.Objects passed
-	// to a RESTClient or Client. Required when initializing a RESTClient, optional
-	// when initializing a Client.
-	Codec runtime.Codec
+	// Prefix is the sub path of the server. If not specified, the client will set
+	// a default value.  Use "/" to indicate the server root should be used
+	Prefix string
+
+	// ContentConfig contains settings that affect how objects are transformed when
+	// sent to the server.
+	ContentConfig
 
 	// Server requires Basic authentication
 	Username string
@@ -120,6 +119,22 @@ type TLSClientConfig struct {
 	CAData []byte
 }
 
+type ContentConfig struct {
+	// ContentType specifies the wire format used to communicate with the server.
+	// This value will be set as the Accept header on requests made to the server, and
+	// as the default content type on any object sent to the server. If not set,
+	// "application/json" is used.
+	ContentType string
+	// GroupVersion is the API version to talk to. Must be provided when initializing
+	// a RESTClient directly. When initializing a Client, will be set with the default
+	// code version.
+	GroupVersion *unversioned.GroupVersion
+	// Codec specifies the encoding and decoding behavior for runtime.Objects passed
+	// to a RESTClient or Client. Required when initializing a RESTClient, optional
+	// when initializing a Client.
+	Codec runtime.Codec
+}
+
 // New creates a Kubernetes client for the given config. This client works with pods,
 // replication controllers, daemons, and services. It allows operations such as list, get, update
 // and delete on these objects. An error is returned if the provided configuration
@@ -407,16 +422,18 @@ func RESTClientFor(config *Config) (*RESTClient, error) {
 		return nil, err
 	}
 
-	client := NewRESTClient(baseURL, versionedAPIPath, *config.GroupVersion, config.Codec, config.QPS, config.Burst)
-
 	transport, err := TransportFor(config)
 	if err != nil {
 		return nil, err
 	}
 
+	var httpClient *http.Client
 	if transport != http.DefaultTransport {
-		client.Client = &http.Client{Transport: transport}
+		httpClient = &http.Client{Transport: transport}
 	}
+
+	client := NewRESTClient(baseURL, versionedAPIPath, config.ContentConfig, config.QPS, config.Burst, httpClient)
+
 	return client, nil
 }
 
@@ -432,16 +449,23 @@ func UnversionedRESTClientFor(config *Config) (*RESTClient, error) {
 		return nil, err
 	}
 
-	client := NewRESTClient(baseURL, versionedAPIPath, unversioned.SchemeGroupVersion, config.Codec, config.QPS, config.Burst)
-
 	transport, err := TransportFor(config)
 	if err != nil {
 		return nil, err
 	}
 
+	var httpClient *http.Client
 	if transport != http.DefaultTransport {
-		client.Client = &http.Client{Transport: transport}
+		httpClient = &http.Client{Transport: transport}
 	}
+
+	versionConfig := config.ContentConfig
+	if versionConfig.GroupVersion == nil {
+		v := unversioned.SchemeGroupVersion
+		versionConfig.GroupVersion = &v
+	}
+
+	client := NewRESTClient(baseURL, versionedAPIPath, versionConfig, config.QPS, config.Burst, httpClient)
 	return client, nil
 }
 
diff --git a/pkg/client/unversioned/helper_blackbox_test.go b/pkg/client/unversioned/helper_blackbox_test.go
index 0c961e251e1..5d497d5034f 100644
--- a/pkg/client/unversioned/helper_blackbox_test.go
+++ b/pkg/client/unversioned/helper_blackbox_test.go
@@ -70,21 +70,21 @@ func TestNegotiateVersion(t *testing.T) {
 		},
 		{
 			name:            "explicit version supported",
-			config:          &unversioned.Config{GroupVersion: testapi.Default.GroupVersion()},
+			config:          &unversioned.Config{ContentConfig: unversioned.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}},
 			serverVersions:  []string{"/version1", testapi.Default.GroupVersion().String()},
 			clientVersions:  []uapi.GroupVersion{{Version: "version1"}, *testapi.Default.GroupVersion()},
 			expectedVersion: testapi.Default.GroupVersion(),
 		},
 		{
 			name:           "explicit version not supported",
-			config:         &unversioned.Config{GroupVersion: testapi.Default.GroupVersion()},
+			config:         &unversioned.Config{ContentConfig: unversioned.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}},
 			serverVersions: []string{"version1"},
 			clientVersions: []uapi.GroupVersion{{Version: "version1"}, *testapi.Default.GroupVersion()},
 			expectErr:      func(err error) bool { return strings.Contains(err.Error(), `server does not support API version "v1"`) },
 		},
 		{
 			name:           "connection refused error",
-			config:         &unversioned.Config{GroupVersion: testapi.Default.GroupVersion()},
+			config:         &unversioned.Config{ContentConfig: unversioned.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}},
 			serverVersions: []string{"version1"},
 			clientVersions: []uapi.GroupVersion{{Version: "version1"}, *testapi.Default.GroupVersion()},
 			sendErr:        errors.New("connection refused"),
diff --git a/pkg/client/unversioned/helper_test.go b/pkg/client/unversioned/helper_test.go
index 8f9b6b3e7b2..2d565afc215 100644
--- a/pkg/client/unversioned/helper_test.go
+++ b/pkg/client/unversioned/helper_test.go
@@ -92,11 +92,13 @@ func TestSetKubernetesDefaults(t *testing.T) {
 		{
 			Config{},
 			Config{
-				APIPath:      "/api",
-				GroupVersion: testapi.Default.GroupVersion(),
-				Codec:        testapi.Default.Codec(),
-				QPS:          5,
-				Burst:        10,
+				APIPath: "/api",
+				ContentConfig: ContentConfig{
+					GroupVersion: testapi.Default.GroupVersion(),
+					Codec:        testapi.Default.Codec(),
+				},
+				QPS:   5,
+				Burst: 10,
 			},
 			false,
 		},
@@ -188,7 +190,7 @@ func TestHelperGetServerAPIVersions(t *testing.T) {
 	}))
 	// TODO: Uncomment when fix #19254
 	// defer server.Close()
-	got, err := ServerAPIVersions(&Config{Host: server.URL, GroupVersion: &unversioned.GroupVersion{Group: "invalid version", Version: "one"}, Codec: testapi.Default.Codec()})
+	got, err := ServerAPIVersions(&Config{Host: server.URL, ContentConfig: ContentConfig{GroupVersion: &unversioned.GroupVersion{Group: "invalid version", Version: "one"}, Codec: testapi.Default.Codec()}})
 	if err != nil {
 		t.Fatalf("unexpected encoding error: %v", err)
 	}
@@ -208,7 +210,7 @@ func TestSetsCodec(t *testing.T) {
 		// "invalidVersion":                       {true, "", nil},
 	}
 	for version, expected := range testCases {
-		client, err := New(&Config{Host: "127.0.0.1", GroupVersion: &unversioned.GroupVersion{Version: version}})
+		client, err := New(&Config{Host: "127.0.0.1", ContentConfig: ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: version}}})
 		switch {
 		case err == nil && expected.Err:
 			t.Errorf("expected error but was nil")
@@ -222,20 +224,20 @@ func TestSetsCodec(t *testing.T) {
 		if e, a := expected.Prefix, client.RESTClient.versionedAPIPath; e != a {
 			t.Errorf("expected %#v, got %#v", e, a)
 		}
-		if e, a := expected.Codec, client.RESTClient.Codec; !reflect.DeepEqual(e, a) {
+		if e, a := expected.Codec, client.RESTClient.contentConfig.Codec; !reflect.DeepEqual(e, a) {
 			t.Errorf("expected %#v, got %#v", e, a)
 		}
 	}
 }
 
 func TestRESTClientRequires(t *testing.T) {
-	if _, err := RESTClientFor(&Config{Host: "127.0.0.1", Codec: testapi.Default.Codec()}); err == nil {
+	if _, err := RESTClientFor(&Config{Host: "127.0.0.1", ContentConfig: ContentConfig{Codec: testapi.Default.Codec()}}); err == nil {
 		t.Errorf("unexpected non-error")
 	}
-	if _, err := RESTClientFor(&Config{Host: "127.0.0.1", GroupVersion: testapi.Default.GroupVersion()}); err == nil {
+	if _, err := RESTClientFor(&Config{Host: "127.0.0.1", ContentConfig: ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}); err == nil {
 		t.Errorf("unexpected non-error")
 	}
-	if _, err := RESTClientFor(&Config{Host: "127.0.0.1", GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()}); err != nil {
+	if _, err := RESTClientFor(&Config{Host: "127.0.0.1", ContentConfig: ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()}}); err != nil {
 		t.Errorf("unexpected error: %v", err)
 	}
 }
diff --git a/pkg/client/unversioned/remotecommand/remotecommand_test.go b/pkg/client/unversioned/remotecommand/remotecommand_test.go
index 681eb57b2cc..68fb9eb129b 100644
--- a/pkg/client/unversioned/remotecommand/remotecommand_test.go
+++ b/pkg/client/unversioned/remotecommand/remotecommand_test.go
@@ -190,7 +190,7 @@ func TestRequestExecuteRemoteCommand(t *testing.T) {
 		server := httptest.NewServer(fakeExecServer(t, i, testCase.Stdin, testCase.Stdout, testCase.Stderr, testCase.Error, testCase.Tty, testCase.MessageCount))
 
 		url, _ := url.ParseRequestURI(server.URL)
-		c := client.NewRESTClient(url, "", unversioned.GroupVersion{Group: "x"}, nil, -1, -1)
+		c := client.NewRESTClient(url, "", client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Group: "x"}}, -1, -1, nil)
 		req := c.Post().Resource("testing")
 		req.SetHeader(httpstream.HeaderProtocolVersion, StreamProtocolV2Name)
 		req.Param("command", "ls")
@@ -275,7 +275,7 @@ func TestRequestAttachRemoteCommand(t *testing.T) {
 		server := httptest.NewServer(fakeExecServer(t, i, testCase.Stdin, testCase.Stdout, testCase.Stderr, testCase.Error, testCase.Tty, 1))
 
 		url, _ := url.ParseRequestURI(server.URL)
-		c := client.NewRESTClient(url, "", unversioned.GroupVersion{Group: "x"}, nil, -1, -1)
+		c := client.NewRESTClient(url, "", client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Group: "x"}}, -1, -1, nil)
 		req := c.Post().Resource("testing")
 
 		conf := &client.Config{
diff --git a/pkg/client/unversioned/request.go b/pkg/client/unversioned/request.go
index 2bcb38fa581..94f93b9d37b 100644
--- a/pkg/client/unversioned/request.go
+++ b/pkg/client/unversioned/request.go
@@ -81,10 +81,11 @@ func (r *RequestConstructionError) Error() string {
 // check once.
 type Request struct {
 	// required
-	client  HTTPClient
-	verb    string
+	client HTTPClient
+	verb   string
+
 	baseURL *url.URL
-	codec   runtime.Codec
+	content ContentConfig
 
 	// generic components accessible via method setters
 	pathPrefix string
@@ -101,8 +102,6 @@ type Request struct {
 	selector     labels.Selector
 	timeout      time.Duration
 
-	groupVersion unversioned.GroupVersion
-
 	// output
 	err  error
 	body io.Reader
@@ -115,26 +114,28 @@ type Request struct {
 }
 
 // NewRequest creates a new request helper object for accessing runtime.Objects on a server.
-func NewRequest(client HTTPClient, verb string, baseURL *url.URL, versionedAPIPath string, groupVersion unversioned.GroupVersion, codec runtime.Codec, backoff BackoffManager) *Request {
+func NewRequest(client HTTPClient, verb string, baseURL *url.URL, versionedAPIPath string, content ContentConfig, backoff BackoffManager) *Request {
 	if backoff == nil {
 		glog.V(2).Infof("Not implementing request backoff strategy.")
 		backoff = &NoBackoff{}
 	}
-	metrics.Register()
 
 	pathPrefix := "/"
 	if baseURL != nil {
 		pathPrefix = path.Join(pathPrefix, baseURL.Path)
 	}
-	return &Request{
-		client:       client,
-		verb:         verb,
-		baseURL:      baseURL,
-		pathPrefix:   path.Join(pathPrefix, versionedAPIPath),
-		groupVersion: groupVersion,
-		codec:        codec,
-		backoffMgr:   backoff,
+	r := &Request{
+		client:     client,
+		verb:       verb,
+		baseURL:    baseURL,
+		pathPrefix: path.Join(pathPrefix, versionedAPIPath),
+		content:    content,
+		backoffMgr: backoff,
 	}
+	if len(content.ContentType) > 0 {
+		r.SetHeader("Accept", content.ContentType+", */*")
+	}
+	return r
 }
 
 // Prefix adds segments to the relative beginning to the request path. These
@@ -323,8 +324,8 @@ func (r resourceTypeToFieldMapping) filterField(resourceType, field, value strin
 
 type versionToResourceToFieldMapping map[unversioned.GroupVersion]resourceTypeToFieldMapping
 
-func (v versionToResourceToFieldMapping) filterField(groupVersion unversioned.GroupVersion, resourceType, field, value string) (newField, newValue string, err error) {
-	rMapping, ok := v[groupVersion]
+func (v versionToResourceToFieldMapping) filterField(groupVersion *unversioned.GroupVersion, resourceType, field, value string) (newField, newValue string, err error) {
+	rMapping, ok := v[*groupVersion]
 	if !ok {
 		glog.Warningf("Field selector: %v - %v - %v - %v: need to check if this is versioned correctly.", groupVersion, resourceType, field, value)
 		return field, value, nil
@@ -384,13 +385,13 @@ func (r *Request) FieldsSelectorParam(s fields.Selector) *Request {
 		return r
 	}
 	s2, err := s.Transform(func(field, value string) (newField, newValue string, err error) {
-		return fieldMappings.filterField(r.groupVersion, r.resource, field, value)
+		return fieldMappings.filterField(r.content.GroupVersion, r.resource, field, value)
 	})
 	if err != nil {
 		r.err = err
 		return r
 	}
-	return r.setParam(unversioned.FieldSelectorQueryParam(r.groupVersion.String()), s2.String())
+	return r.setParam(unversioned.FieldSelectorQueryParam(r.content.GroupVersion.String()), s2.String())
 }
 
 // LabelsSelectorParam adds the given selector as a query parameter
@@ -404,7 +405,7 @@ func (r *Request) LabelsSelectorParam(s labels.Selector) *Request {
 	if s.Empty() {
 		return r
 	}
-	return r.setParam(unversioned.LabelSelectorQueryParam(r.groupVersion.String()), s.String())
+	return r.setParam(unversioned.LabelSelectorQueryParam(r.content.GroupVersion.String()), s.String())
 }
 
 // UintParam creates a query parameter with the given value.
@@ -430,7 +431,7 @@ func (r *Request) VersionedParams(obj runtime.Object, convertor runtime.ObjectCo
 	if r.err != nil {
 		return r
 	}
-	versioned, err := convertor.ConvertToVersion(obj, r.groupVersion.String())
+	versioned, err := convertor.ConvertToVersion(obj, r.content.GroupVersion.String())
 	if err != nil {
 		r.err = err
 		return r
@@ -444,14 +445,14 @@ func (r *Request) VersionedParams(obj runtime.Object, convertor runtime.ObjectCo
 		for _, value := range v {
 			// TODO: Move it to setParam method, once we get rid of
 			// FieldSelectorParam & LabelSelectorParam methods.
-			if k == unversioned.LabelSelectorQueryParam(r.groupVersion.String()) && value == "" {
+			if k == unversioned.LabelSelectorQueryParam(r.content.GroupVersion.String()) && value == "" {
 				// Don't set an empty selector for backward compatibility.
 				// Since there is no way to get the difference between empty
 				// and unspecified string, we don't set it to avoid having
 				// labelSelector= param in every request.
 				continue
 			}
-			if k == unversioned.FieldSelectorQueryParam(r.groupVersion.String()) {
+			if k == unversioned.FieldSelectorQueryParam(r.content.GroupVersion.String()) {
 				if len(value) == 0 {
 					// Don't set an empty selector for backward compatibility.
 					// Since there is no way to get the difference between empty
@@ -467,7 +468,7 @@ func (r *Request) VersionedParams(obj runtime.Object, convertor runtime.ObjectCo
 				}
 				filteredSelector, err := selector.Transform(
 					func(field, value string) (newField, newValue string, err error) {
-						return fieldMappings.filterField(r.groupVersion, r.resource, field, value)
+						return fieldMappings.filterField(r.content.GroupVersion, r.resource, field, value)
 					})
 				if err != nil {
 					r.err = fmt.Errorf("untransformable field selector: %v", err)
@@ -542,14 +543,14 @@ func (r *Request) Body(obj interface{}) *Request {
 		if reflect.ValueOf(t).IsNil() {
 			return r
 		}
-		data, err := runtime.Encode(r.codec, t)
+		data, err := runtime.Encode(r.content.Codec, t)
 		if err != nil {
 			r.err = err
 			return r
 		}
 		glog.V(8).Infof("Request Body: %s", string(data))
 		r.body = bytes.NewBuffer(data)
-		r.SetHeader("Content-Type", "application/json")
+		r.SetHeader("Content-Type", r.content.ContentType)
 	default:
 		r.err = fmt.Errorf("unknown type used for body: %+v", obj)
 	}
@@ -652,7 +653,7 @@ func (r *Request) Watch() (watch.Interface, error) {
 		}
 		return nil, fmt.Errorf("for request '%+v', got status: %v", url, resp.StatusCode)
 	}
-	return watch.NewStreamWatcher(watchjson.NewDecoder(resp.Body, r.codec)), nil
+	return watch.NewStreamWatcher(watchjson.NewDecoder(resp.Body, r.content.Codec)), nil
 }
 
 // updateURLMetrics is a convenience function for pushing metrics.
@@ -717,7 +718,7 @@ func (r *Request) Stream() (io.ReadCloser, error) {
 			return nil, fmt.Errorf("%v while accessing %v", resp.Status, url)
 		}
 
-		if runtimeObject, err := runtime.Decode(r.codec, bodyBytes); err == nil {
+		if runtimeObject, err := runtime.Decode(r.content.Codec, bodyBytes); err == nil {
 			statusError := errors.FromObject(runtimeObject)
 
 			if _, ok := statusError.(errors.APIStatus); ok {
@@ -847,7 +848,7 @@ func (r *Request) transformResponse(resp *http.Response, req *http.Request) Resu
 	// Did the server give us a status response?
 	isStatusResponse := false
 	var status *unversioned.Status
-	result, err := runtime.Decode(r.codec, body)
+	result, err := runtime.Decode(r.content.Codec, body)
 	if out, ok := result.(*unversioned.Status); err == nil && ok && len(out.Status) > 0 {
 		status = out
 		isStatusResponse = true
@@ -871,9 +872,10 @@ func (r *Request) transformResponse(resp *http.Response, req *http.Request) Resu
 	}
 
 	return Result{
-		body:       body,
-		statusCode: resp.StatusCode,
-		codec:      r.codec,
+		body:        body,
+		contentType: resp.Header.Get("Content-Type"),
+		statusCode:  resp.StatusCode,
+		decoder:     r.content.Codec,
 	}
 }
 
@@ -908,7 +910,18 @@ func (r *Request) transformUnstructuredResponseError(resp *http.Response, req *h
 		message = strings.TrimSpace(string(body))
 	}
 	retryAfter, _ := retryAfterSeconds(resp)
-	return errors.NewGenericServerResponse(resp.StatusCode, req.Method, unversioned.GroupResource{Group: r.groupVersion.Group, Resource: r.resource}, r.resourceName, message, retryAfter, true)
+	return errors.NewGenericServerResponse(
+		resp.StatusCode,
+		req.Method,
+		unversioned.GroupResource{
+			Group:    r.content.GroupVersion.Group,
+			Resource: r.resource,
+		},
+		r.resourceName,
+		message,
+		retryAfter,
+		true,
+	)
 }
 
 // isTextResponse returns true if the response appears to be a textual media type.
@@ -950,11 +963,12 @@ func retryAfterSeconds(resp *http.Response) (int, bool) {
 
 // Result contains the result of calling Request.Do().
 type Result struct {
-	body       []byte
-	err        error
-	statusCode int
+	body        []byte
+	contentType string
+	err         error
+	statusCode  int
 
-	codec runtime.Codec
+	decoder runtime.Decoder
 }
 
 // Raw returns the raw result.
@@ -967,8 +981,7 @@ func (r Result) Get() (runtime.Object, error) {
 	if r.err != nil {
 		return nil, r.err
 	}
-	obj, err := runtime.Decode(r.codec, r.body)
-	return obj, err
+	return runtime.Decode(r.decoder, r.body)
 }
 
 // StatusCode returns the HTTP status code of the request. (Only valid if no
@@ -983,7 +996,7 @@ func (r Result) Into(obj runtime.Object) error {
 	if r.err != nil {
 		return r.err
 	}
-	return runtime.DecodeInto(r.codec, r.body, obj)
+	return runtime.DecodeInto(r.decoder, r.body, obj)
 }
 
 // WasCreated updates the provided bool pointer to whether the server returned
diff --git a/pkg/client/unversioned/request_test.go b/pkg/client/unversioned/request_test.go
index 52203af9ad5..ffd1cacc3af 100644
--- a/pkg/client/unversioned/request_test.go
+++ b/pkg/client/unversioned/request_test.go
@@ -45,10 +45,21 @@ import (
 	watchjson "k8s.io/kubernetes/pkg/watch/json"
 )
 
+func TestNewRequestSetsAccept(t *testing.T) {
+	r := NewRequest(nil, "get", &url.URL{Path: "/path/"}, "", ContentConfig{}, nil)
+	if r.headers.Get("Accept") != "" {
+		t.Errorf("unexpected headers: %#v", r.headers)
+	}
+	r = NewRequest(nil, "get", &url.URL{Path: "/path/"}, "", ContentConfig{ContentType: "application/other"}, nil)
+	if r.headers.Get("Accept") != "application/other, */*" {
+		t.Errorf("unexpected headers: %#v", r.headers)
+	}
+}
+
 func TestRequestWithErrorWontChange(t *testing.T) {
 	original := Request{
-		err:          errors.New("test"),
-		groupVersion: *testapi.Default.GroupVersion(),
+		err:     errors.New("test"),
+		content: ContentConfig{GroupVersion: testapi.Default.GroupVersion()},
 	}
 	r := original
 	changed := r.Param("foo", "bar").
@@ -179,7 +190,7 @@ func TestRequestParam(t *testing.T) {
 }
 
 func TestRequestVersionedParams(t *testing.T) {
-	r := (&Request{groupVersion: v1.SchemeGroupVersion}).Param("foo", "a")
+	r := (&Request{content: ContentConfig{GroupVersion: &v1.SchemeGroupVersion}}).Param("foo", "a")
 	if !reflect.DeepEqual(r.params, url.Values{"foo": []string{"a"}}) {
 		t.Errorf("should have set a param: %#v", r)
 	}
@@ -195,7 +206,7 @@ func TestRequestVersionedParams(t *testing.T) {
 }
 
 func TestRequestVersionedParamsFromListOptions(t *testing.T) {
-	r := &Request{groupVersion: v1.SchemeGroupVersion}
+	r := &Request{content: ContentConfig{GroupVersion: &v1.SchemeGroupVersion}}
 	r.VersionedParams(&api.ListOptions{ResourceVersion: "1"}, api.Scheme)
 	if !reflect.DeepEqual(r.params, url.Values{
 		"resourceVersion": []string{"1"},
@@ -250,7 +261,7 @@ func TestRequestBody(t *testing.T) {
 	}
 
 	// test unencodable api object
-	r = (&Request{codec: testapi.Default.Codec()}).Body(&NotAnAPIObject{})
+	r = (&Request{content: ContentConfig{Codec: testapi.Default.Codec()}}).Body(&NotAnAPIObject{})
 	if r.err == nil || r.body != nil {
 		t.Errorf("should have set err and left body nil: %#v", r)
 	}
@@ -265,7 +276,7 @@ func TestResultIntoWithErrReturnsErr(t *testing.T) {
 
 func TestURLTemplate(t *testing.T) {
 	uri, _ := url.Parse("http://localhost")
-	r := NewRequest(nil, "POST", uri, "", unversioned.GroupVersion{Group: "test"}, nil, nil)
+	r := NewRequest(nil, "POST", uri, "", ContentConfig{GroupVersion: &unversioned.GroupVersion{Group: "test"}}, nil)
 	r.Prefix("pre1").Resource("r1").Namespace("ns").Name("nm").Param("p0", "v0")
 	full := r.URL()
 	if full.String() != "http://localhost/pre1/namespaces/ns/r1/nm?p0=v0" {
@@ -326,7 +337,7 @@ func TestTransformResponse(t *testing.T) {
 		{Response: &http.Response{StatusCode: 200, Body: ioutil.NopCloser(bytes.NewReader(invalid))}, Data: invalid},
 	}
 	for i, test := range testCases {
-		r := NewRequest(nil, "", uri, "", *testapi.Default.GroupVersion(), testapi.Default.Codec(), nil)
+		r := NewRequest(nil, "", uri, "", ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()}, nil)
 		if test.Response.Body == nil {
 			test.Response.Body = ioutil.NopCloser(bytes.NewReader([]byte{}))
 		}
@@ -413,7 +424,7 @@ func TestTransformUnstructuredError(t *testing.T) {
 
 	for _, testCase := range testCases {
 		r := &Request{
-			codec:        testapi.Default.Codec(),
+			content:      ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()},
 			resourceName: testCase.Name,
 			resource:     testCase.Resource,
 		}
@@ -464,7 +475,7 @@ func TestRequestWatch(t *testing.T) {
 		},
 		{
 			Request: &Request{
-				codec: testapi.Default.Codec(),
+				content: ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()},
 				client: clientFunc(func(req *http.Request) (*http.Response, error) {
 					return &http.Response{StatusCode: http.StatusForbidden}, nil
 				}),
@@ -477,7 +488,7 @@ func TestRequestWatch(t *testing.T) {
 		},
 		{
 			Request: &Request{
-				codec: testapi.Default.Codec(),
+				content: ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()},
 				client: clientFunc(func(req *http.Request) (*http.Response, error) {
 					return &http.Response{StatusCode: http.StatusUnauthorized}, nil
 				}),
@@ -490,7 +501,7 @@ func TestRequestWatch(t *testing.T) {
 		},
 		{
 			Request: &Request{
-				codec: testapi.Default.Codec(),
+				content: ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()},
 				client: clientFunc(func(req *http.Request) (*http.Response, error) {
 					return &http.Response{
 						StatusCode: http.StatusUnauthorized,
@@ -602,7 +613,7 @@ func TestRequestStream(t *testing.T) {
 						})))),
 					}, nil
 				}),
-				codec:   testapi.Default.Codec(),
+				content: ContentConfig{Codec: testapi.Default.Codec()},
 				baseURL: &url.URL{},
 			},
 			Err: true,
@@ -1109,7 +1120,7 @@ func TestUintParam(t *testing.T) {
 
 	for _, item := range table {
 		u, _ := url.Parse("http://localhost")
-		r := NewRequest(nil, "GET", u, "", unversioned.GroupVersion{Group: "test"}, nil, nil).AbsPath("").UintParam(item.name, item.testVal)
+		r := NewRequest(nil, "GET", u, "", ContentConfig{GroupVersion: &unversioned.GroupVersion{Group: "test"}}, nil).AbsPath("").UintParam(item.name, item.testVal)
 		if e, a := item.expectStr, r.URL().String(); e != a {
 			t.Errorf("expected %v, got %v", e, a)
 		}
@@ -1149,6 +1160,8 @@ func TestBody(t *testing.T) {
 	}
 	f.Close()
 
+	var nilObject *api.DeleteOptions
+	typedObject := interface{}(nilObject)
 	c := testRESTClient(t, nil)
 	tests := []struct {
 		input    interface{}
@@ -1159,6 +1172,7 @@ func TestBody(t *testing.T) {
 		{f.Name(), data, nil},
 		{strings.NewReader(data), data, nil},
 		{obj, string(bodyExpected), map[string]string{"Content-Type": "application/json"}},
+		{typedObject, "", nil},
 	}
 	for i, tt := range tests {
 		r := c.Post().Body(tt.input)
@@ -1166,6 +1180,20 @@ func TestBody(t *testing.T) {
 			t.Errorf("%d: r.Body(%#v) error: %v", i, tt, r.err)
 			continue
 		}
+		if tt.headers != nil {
+			for k, v := range tt.headers {
+				if r.headers.Get(k) != v {
+					t.Errorf("%d: r.headers[%q] = %q; want %q", i, k, v, v)
+				}
+			}
+		}
+
+		if r.body == nil {
+			if len(tt.expected) != 0 {
+				t.Errorf("%d: r.body = %q; want %q", i, r.body, tt.expected)
+			}
+			continue
+		}
 		buf := make([]byte, len(tt.expected))
 		if _, err := r.body.Read(buf); err != nil {
 			t.Errorf("%d: r.body.Read error: %v", i, err)
@@ -1175,13 +1203,6 @@ func TestBody(t *testing.T) {
 		if body != tt.expected {
 			t.Errorf("%d: r.body = %q; want %q", i, body, tt.expected)
 		}
-		if tt.headers != nil {
-			for k, v := range tt.headers {
-				if r.headers.Get(k) != v {
-					t.Errorf("%d: r.headers[%q] = %q; want %q", i, k, v, v)
-				}
-			}
-		}
 	}
 }
 
@@ -1282,5 +1303,5 @@ func testRESTClient(t testing.TB, srv *httptest.Server) *RESTClient {
 		}
 	}
 	versionedAPIPath := testapi.Default.ResourcePath("", "", "")
-	return NewRESTClient(baseURL, versionedAPIPath, *testapi.Default.GroupVersion(), testapi.Default.Codec(), 0, 0)
+	return NewRESTClient(baseURL, versionedAPIPath, ContentConfig{GroupVersion: testapi.Default.GroupVersion(), Codec: testapi.Default.Codec()}, 0, 0, nil)
 }
diff --git a/pkg/client/unversioned/restclient.go b/pkg/client/unversioned/restclient.go
index 30cecc870e2..914eee0c650 100644
--- a/pkg/client/unversioned/restclient.go
+++ b/pkg/client/unversioned/restclient.go
@@ -26,7 +26,6 @@ import (
 
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/unversioned"
-	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/util"
 )
 
@@ -45,27 +44,25 @@ const (
 //
 // Most consumers should use client.New() to get a Kubernetes API client.
 type RESTClient struct {
-	baseURL          *url.URL
+	// base is the root URL for all invocations of the client
+	base *url.URL
+	// versionedAPIPath is a path segment connecting the base URL to the resource root
 	versionedAPIPath string
-	// A string identifying the version of the API this client is expected to use.
-	groupVersion unversioned.GroupVersion
 
-	// Codec is the encoding and decoding scheme that applies to a particular set of
-	// REST resources.
-	Codec runtime.Codec
-
-	// Set specific behavior of the client.  If not set http.DefaultClient will be
-	// used.
-	Client *http.Client
+	// contentConfig is the information used to communicate with the server.
+	contentConfig ContentConfig
 
 	// TODO extract this into a wrapper interface via the RESTClient interface in kubectl.
 	Throttle util.RateLimiter
+
+	// Set specific behavior of the client.  If not set http.DefaultClient will be used.
+	Client *http.Client
 }
 
 // NewRESTClient creates a new RESTClient. This client performs generic REST functions
 // such as Get, Put, Post, and Delete on specified paths.  Codec controls encoding and
 // decoding of responses from the server.
-func NewRESTClient(baseURL *url.URL, versionedAPIPath string, groupVersion unversioned.GroupVersion, c runtime.Codec, maxQPS float32, maxBurst int) *RESTClient {
+func NewRESTClient(baseURL *url.URL, versionedAPIPath string, config ContentConfig, maxQPS float32, maxBurst int, client *http.Client) *RESTClient {
 	base := *baseURL
 	if !strings.HasSuffix(base.Path, "/") {
 		base.Path += "/"
@@ -73,16 +70,23 @@ func NewRESTClient(baseURL *url.URL, versionedAPIPath string, groupVersion unver
 	base.RawQuery = ""
 	base.Fragment = ""
 
+	if config.GroupVersion == nil {
+		config.GroupVersion = &unversioned.GroupVersion{}
+	}
+	if len(config.ContentType) == 0 {
+		config.ContentType = "application/json"
+	}
+
 	var throttle util.RateLimiter
 	if maxQPS > 0 {
 		throttle = util.NewTokenBucketRateLimiter(maxQPS, maxBurst)
 	}
 	return &RESTClient{
-		baseURL:          &base,
+		base:             &base,
 		versionedAPIPath: versionedAPIPath,
-		groupVersion:     groupVersion,
-		Codec:            c,
+		contentConfig:    config,
 		Throttle:         throttle,
+		Client:           client,
 	}
 }
 
@@ -97,12 +101,11 @@ func readExpBackoffConfig() BackoffManager {
 	backoffDurationInt, errDuration := strconv.ParseInt(backoffDuration, 10, 64)
 	if errBase != nil || errDuration != nil {
 		return &NoBackoff{}
-	} else {
-		return &URLBackoff{
-			Backoff: util.NewBackOff(
-				time.Duration(backoffBaseInt)*time.Second,
-				time.Duration(backoffDurationInt)*time.Second)}
 	}
+	return &URLBackoff{
+		Backoff: util.NewBackOff(
+			time.Duration(backoffBaseInt)*time.Second,
+			time.Duration(backoffDurationInt)*time.Second)}
 }
 
 // Verb begins a request with a verb (GET, POST, PUT, DELETE).
@@ -125,9 +128,9 @@ func (c *RESTClient) Verb(verb string) *Request {
 	backoff := readExpBackoffConfig()
 
 	if c.Client == nil {
-		return NewRequest(nil, verb, c.baseURL, c.versionedAPIPath, c.groupVersion, c.Codec, backoff)
+		return NewRequest(nil, verb, c.base, c.versionedAPIPath, c.contentConfig, backoff)
 	}
-	return NewRequest(c.Client, verb, c.baseURL, c.versionedAPIPath, c.groupVersion, c.Codec, backoff)
+	return NewRequest(c.Client, verb, c.base, c.versionedAPIPath, c.contentConfig, backoff)
 }
 
 // Post begins a POST request. Short for c.Verb("POST").
@@ -157,5 +160,5 @@ func (c *RESTClient) Delete() *Request {
 
 // APIVersion returns the APIVersion this RESTClient is expected to use.
 func (c *RESTClient) APIVersion() unversioned.GroupVersion {
-	return c.groupVersion
+	return *c.contentConfig.GroupVersion
 }
diff --git a/pkg/client/unversioned/restclient_test.go b/pkg/client/unversioned/restclient_test.go
index b59da0fe7ac..8a5968b3131 100644
--- a/pkg/client/unversioned/restclient_test.go
+++ b/pkg/client/unversioned/restclient_test.go
@@ -45,11 +45,13 @@ func TestDoRequestSuccess(t *testing.T) {
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
 	c, err := RESTClientFor(&Config{
-		Host:         testServer.URL,
-		GroupVersion: testapi.Default.GroupVersion(),
-		Codec:        testapi.Default.Codec(),
-		Username:     "user",
-		Password:     "pass",
+		Host: testServer.URL,
+		ContentConfig: ContentConfig{
+			GroupVersion: testapi.Default.GroupVersion(),
+			Codec:        testapi.Default.Codec(),
+		},
+		Username: "user",
+		Password: "pass",
 	})
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
@@ -89,9 +91,11 @@ func TestDoRequestFailed(t *testing.T) {
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
 	c, err := RESTClientFor(&Config{
-		Host:         testServer.URL,
-		GroupVersion: testapi.Default.GroupVersion(),
-		Codec:        testapi.Default.Codec(),
+		Host: testServer.URL,
+		ContentConfig: ContentConfig{
+			GroupVersion: testapi.Default.GroupVersion(),
+			Codec:        testapi.Default.Codec(),
+		},
 	})
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
@@ -122,11 +126,13 @@ func TestDoRequestCreated(t *testing.T) {
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
 	c, err := RESTClientFor(&Config{
-		Host:         testServer.URL,
-		GroupVersion: testapi.Default.GroupVersion(),
-		Codec:        testapi.Default.Codec(),
-		Username:     "user",
-		Password:     "pass",
+		Host: testServer.URL,
+		ContentConfig: ContentConfig{
+			GroupVersion: testapi.Default.GroupVersion(),
+			Codec:        testapi.Default.Codec(),
+		},
+		Username: "user",
+		Password: "pass",
 	})
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
diff --git a/pkg/client/unversioned/testclient/simple/simple_testclient.go b/pkg/client/unversioned/testclient/simple/simple_testclient.go
index 60a74963d1a..0c2c01d3848 100644
--- a/pkg/client/unversioned/testclient/simple/simple_testclient.go
+++ b/pkg/client/unversioned/testclient/simple/simple_testclient.go
@@ -76,15 +76,15 @@ func (c *Client) Setup(t *testing.T) *Client {
 	c.server = httptest.NewServer(c.handler)
 	if c.Client == nil {
 		c.Client = client.NewOrDie(&client.Config{
-			Host:         c.server.URL,
-			GroupVersion: testapi.Default.GroupVersion(),
+			Host:          c.server.URL,
+			ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()},
 		})
 
 		// TODO: caesarxuchao: hacky way to specify version of Experimental client.
 		// We will fix this by supporting multiple group versions in Config
 		c.ExtensionsClient = client.NewExtensionsOrDie(&client.Config{
-			Host:         c.server.URL,
-			GroupVersion: testapi.Extensions.GroupVersion(),
+			Host:          c.server.URL,
+			ContentConfig: client.ContentConfig{GroupVersion: testapi.Extensions.GroupVersion()},
 		})
 	}
 	c.QueryValidator = map[string]func(string, string) bool{}
diff --git a/pkg/controller/controller_utils_test.go b/pkg/controller/controller_utils_test.go
index 17f054249ee..b4ab5b889e1 100644
--- a/pkg/controller/controller_utils_test.go
+++ b/pkg/controller/controller_utils_test.go
@@ -192,7 +192,7 @@ func TestCreatePods(t *testing.T) {
 	testServer := httptest.NewServer(&fakeHandler)
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	podControl := RealPodControl{
 		KubeClient: client,
@@ -212,7 +212,7 @@ func TestCreatePods(t *testing.T) {
 		Spec: controllerSpec.Spec.Template.Spec,
 	}
 	fakeHandler.ValidateRequest(t, testapi.Default.ResourcePath("pods", api.NamespaceDefault, ""), "POST", nil)
-	actualPod, err := runtime.Decode(client.Codec, []byte(fakeHandler.RequestBody))
+	actualPod, err := runtime.Decode(testapi.Default.Codec(), []byte(fakeHandler.RequestBody))
 	if err != nil {
 		t.Errorf("Unexpected error: %#v", err)
 	}
diff --git a/pkg/controller/daemon/controller_test.go b/pkg/controller/daemon/controller_test.go
index 072e9e0b326..5845b7c5f66 100644
--- a/pkg/controller/daemon/controller_test.go
+++ b/pkg/controller/daemon/controller_test.go
@@ -133,7 +133,7 @@ func addPods(podStore cache.Store, nodeName string, label map[string]string, num
 }
 
 func newTestController() (*DaemonSetsController, *controller.FakePodControl) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewDaemonSetsController(client, controller.NoResyncPeriodFunc)
 	manager.podStoreSynced = alwaysReady
 	podControl := &controller.FakePodControl{}
@@ -369,7 +369,7 @@ func TestDSManagerInit(t *testing.T) {
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
 
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewDaemonSetsController(client, controller.NoResyncPeriodFunc)
 	manager.dsStore.Add(ds)
 	manager.nodeStore.Add(newNode(nodeName, nil))
diff --git a/pkg/controller/endpoint/endpoints_controller_test.go b/pkg/controller/endpoint/endpoints_controller_test.go
index c51a8abcac1..2e23a8060b4 100644
--- a/pkg/controller/endpoint/endpoints_controller_test.go
+++ b/pkg/controller/endpoint/endpoints_controller_test.go
@@ -104,7 +104,7 @@ func TestSyncEndpointsItemsPreserveNoSelector(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	endpoints.serviceStore.Store.Add(&api.Service{
 		ObjectMeta: api.ObjectMeta{Name: "foo", Namespace: ns},
@@ -137,7 +137,7 @@ func TestCheckLeftoverEndpoints(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	endpoints.checkLeftoverEndpoints()
 
@@ -166,7 +166,7 @@ func TestSyncEndpointsProtocolTCP(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 1, 1, 0)
 	endpoints.serviceStore.Store.Add(&api.Service{
@@ -208,7 +208,7 @@ func TestSyncEndpointsProtocolUDP(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 1, 1, 0)
 	endpoints.serviceStore.Store.Add(&api.Service{
@@ -247,7 +247,7 @@ func TestSyncEndpointsItemsEmptySelectorSelectsAll(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 1, 1, 0)
 	endpoints.serviceStore.Store.Add(&api.Service{
@@ -285,7 +285,7 @@ func TestSyncEndpointsItemsEmptySelectorSelectsAllNotReady(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 0, 1, 1)
 	endpoints.serviceStore.Store.Add(&api.Service{
@@ -323,7 +323,7 @@ func TestSyncEndpointsItemsEmptySelectorSelectsAllMixed(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 1, 1, 1)
 	endpoints.serviceStore.Store.Add(&api.Service{
@@ -365,7 +365,7 @@ func TestSyncEndpointsItemsPreexisting(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 1, 1, 0)
 	endpoints.serviceStore.Store.Add(&api.Service{
@@ -406,7 +406,7 @@ func TestSyncEndpointsItemsPreexistingIdentical(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, api.NamespaceDefault, 1, 1, 0)
 	endpoints.serviceStore.Store.Add(&api.Service{
@@ -426,7 +426,7 @@ func TestSyncEndpointsItems(t *testing.T) {
 		serverResponse{http.StatusOK, &api.Endpoints{}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 3, 2, 0)
 	addPods(endpoints.podStore.Store, "blah", 5, 2, 0) // make sure these aren't found!
@@ -469,7 +469,7 @@ func TestSyncEndpointsItemsWithLabels(t *testing.T) {
 		serverResponse{http.StatusOK, &api.Endpoints{}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 3, 2, 0)
 	serviceLabels := map[string]string{"foo": "bar"}
@@ -530,7 +530,7 @@ func TestSyncEndpointsItemsPreexistingLabelsChange(t *testing.T) {
 		}})
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	endpoints := NewEndpointController(client, controller.NoResyncPeriodFunc)
 	addPods(endpoints.podStore.Store, ns, 1, 1, 0)
 	serviceLabels := map[string]string{"baz": "blah"}
diff --git a/pkg/controller/job/controller_test.go b/pkg/controller/job/controller_test.go
index e519c0c37e3..16fec482b27 100644
--- a/pkg/controller/job/controller_test.go
+++ b/pkg/controller/job/controller_test.go
@@ -204,7 +204,7 @@ func TestControllerSyncJob(t *testing.T) {
 
 	for name, tc := range testCases {
 		// job manager setup
-		client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+		client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 		manager := NewJobController(client, controller.NoResyncPeriodFunc)
 		fakePodControl := controller.FakePodControl{Err: tc.podControllerError}
 		manager.podControl = &fakePodControl
@@ -299,7 +299,7 @@ func TestSyncJobPastDeadline(t *testing.T) {
 
 	for name, tc := range testCases {
 		// job manager setup
-		client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+		client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 		manager := NewJobController(client, controller.NoResyncPeriodFunc)
 		fakePodControl := controller.FakePodControl{}
 		manager.podControl = &fakePodControl
@@ -369,7 +369,7 @@ func getCondition(job *extensions.Job, condition extensions.JobConditionType) bo
 }
 
 func TestSyncPastDeadlineJobFinished(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewJobController(client, controller.NoResyncPeriodFunc)
 	fakePodControl := controller.FakePodControl{}
 	manager.podControl = &fakePodControl
@@ -403,7 +403,7 @@ func TestSyncPastDeadlineJobFinished(t *testing.T) {
 }
 
 func TestSyncJobComplete(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewJobController(client, controller.NoResyncPeriodFunc)
 	fakePodControl := controller.FakePodControl{}
 	manager.podControl = &fakePodControl
@@ -428,7 +428,7 @@ func TestSyncJobComplete(t *testing.T) {
 }
 
 func TestSyncJobDeleted(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewJobController(client, controller.NoResyncPeriodFunc)
 	fakePodControl := controller.FakePodControl{}
 	manager.podControl = &fakePodControl
@@ -448,7 +448,7 @@ func TestSyncJobDeleted(t *testing.T) {
 }
 
 func TestSyncJobUpdateRequeue(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewJobController(client, controller.NoResyncPeriodFunc)
 	fakePodControl := controller.FakePodControl{}
 	manager.podControl = &fakePodControl
@@ -469,7 +469,7 @@ func TestSyncJobUpdateRequeue(t *testing.T) {
 }
 
 func TestJobPodLookup(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewJobController(client, controller.NoResyncPeriodFunc)
 	manager.podStoreSynced = alwaysReady
 	testCases := []struct {
@@ -559,7 +559,7 @@ func (fe FakeJobExpectations) SatisfiedExpectations(controllerKey string) bool {
 // TestSyncJobExpectations tests that a pod cannot sneak in between counting active pods
 // and checking expectations.
 func TestSyncJobExpectations(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewJobController(client, controller.NoResyncPeriodFunc)
 	fakePodControl := controller.FakePodControl{}
 	manager.podControl = &fakePodControl
diff --git a/pkg/controller/replication/replication_controller_test.go b/pkg/controller/replication/replication_controller_test.go
index 644a55d747a..dc67e883f16 100644
--- a/pkg/controller/replication/replication_controller_test.go
+++ b/pkg/controller/replication/replication_controller_test.go
@@ -130,7 +130,7 @@ type serverResponse struct {
 }
 
 func TestSyncReplicationControllerDoesNothing(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	fakePodControl := controller.FakePodControl{}
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.podStoreSynced = alwaysReady
@@ -146,7 +146,7 @@ func TestSyncReplicationControllerDoesNothing(t *testing.T) {
 }
 
 func TestSyncReplicationControllerDeletes(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	fakePodControl := controller.FakePodControl{}
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.podStoreSynced = alwaysReady
@@ -162,7 +162,7 @@ func TestSyncReplicationControllerDeletes(t *testing.T) {
 }
 
 func TestDeleteFinalStateUnknown(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	fakePodControl := controller.FakePodControl{}
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.podStoreSynced = alwaysReady
@@ -195,7 +195,7 @@ func TestDeleteFinalStateUnknown(t *testing.T) {
 }
 
 func TestSyncReplicationControllerCreates(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.podStoreSynced = alwaysReady
 
@@ -218,7 +218,7 @@ func TestStatusUpdatesWithoutReplicasChange(t *testing.T) {
 	testServer := httptest.NewServer(&fakeHandler)
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.podStoreSynced = alwaysReady
 
@@ -261,7 +261,7 @@ func TestControllerUpdateReplicas(t *testing.T) {
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
 
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.podStoreSynced = alwaysReady
 
@@ -300,7 +300,7 @@ func TestSyncReplicationControllerDormancy(t *testing.T) {
 	testServer := httptest.NewServer(&fakeHandler)
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	fakePodControl := controller.FakePodControl{}
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
@@ -349,7 +349,7 @@ func TestSyncReplicationControllerDormancy(t *testing.T) {
 }
 
 func TestPodControllerLookup(t *testing.T) {
-	manager := NewReplicationManager(client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()}), controller.NoResyncPeriodFunc, BurstReplicas)
+	manager := NewReplicationManager(client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}), controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.podStoreSynced = alwaysReady
 	testCases := []struct {
 		inRCs     []*api.ReplicationController
@@ -561,7 +561,7 @@ func TestControllerUpdateRequeue(t *testing.T) {
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
 
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.podStoreSynced = alwaysReady
 
@@ -641,7 +641,7 @@ func TestControllerUpdateStatusWithFailure(t *testing.T) {
 }
 
 func doTestControllerBurstReplicas(t *testing.T, burstReplicas, numReplicas int) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	fakePodControl := controller.FakePodControl{}
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, burstReplicas)
 	manager.podStoreSynced = alwaysReady
@@ -761,7 +761,7 @@ func (fe FakeRCExpectations) SatisfiedExpectations(controllerKey string) bool {
 // TestRCSyncExpectations tests that a pod cannot sneak in between counting active pods
 // and checking expectations.
 func TestRCSyncExpectations(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	fakePodControl := controller.FakePodControl{}
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, 2)
 	manager.podStoreSynced = alwaysReady
@@ -786,7 +786,7 @@ func TestRCSyncExpectations(t *testing.T) {
 }
 
 func TestDeleteControllerAndExpectations(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, 10)
 	manager.podStoreSynced = alwaysReady
 
@@ -828,7 +828,7 @@ func TestDeleteControllerAndExpectations(t *testing.T) {
 }
 
 func TestRCManagerNotReady(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	fakePodControl := controller.FakePodControl{}
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, 2)
 	manager.podControl = &fakePodControl
@@ -865,7 +865,7 @@ func shuffle(controllers []*api.ReplicationController) []*api.ReplicationControl
 }
 
 func TestOverlappingRCs(t *testing.T) {
-	client := client.NewOrDie(&client.Config{Host: "", GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: "", ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	for i := 0; i < 5; i++ {
 		manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, 10)
@@ -908,7 +908,7 @@ func TestRCManagerInit(t *testing.T) {
 	// TODO: Uncomment when fix #19254
 	// defer testServer.Close()
 
-	client := client.NewOrDie(&client.Config{Host: testServer.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: testServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	manager := NewReplicationManager(client, controller.NoResyncPeriodFunc, BurstReplicas)
 	manager.rcStore.Store.Add(rc)
 	manager.podStoreSynced = alwaysReady
diff --git a/pkg/kubectl/cmd/annotate_test.go b/pkg/kubectl/cmd/annotate_test.go
index e9fddc2dd7b..d2f58bf6536 100644
--- a/pkg/kubectl/cmd/annotate_test.go
+++ b/pkg/kubectl/cmd/annotate_test.go
@@ -392,7 +392,7 @@ func TestAnnotateErrors(t *testing.T) {
 		f, tf, _ := NewAPIFactory()
 		tf.Printer = &testPrinter{}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 		buf := bytes.NewBuffer([]byte{})
 		cmd := NewCmdAnnotate(f, buf)
@@ -448,7 +448,7 @@ func TestAnnotateObject(t *testing.T) {
 		}),
 	}
 	tf.Namespace = "test"
-	tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 	buf := bytes.NewBuffer([]byte{})
 	cmd := NewCmdAnnotate(f, buf)
@@ -498,7 +498,7 @@ func TestAnnotateObjectFromFile(t *testing.T) {
 		}),
 	}
 	tf.Namespace = "test"
-	tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 	buf := bytes.NewBuffer([]byte{})
 	cmd := NewCmdAnnotate(f, buf)
@@ -551,7 +551,7 @@ func TestAnnotateMultipleObjects(t *testing.T) {
 		}),
 	}
 	tf.Namespace = "test"
-	tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 	buf := bytes.NewBuffer([]byte{})
 	cmd := NewCmdAnnotate(f, buf)
diff --git a/pkg/kubectl/cmd/attach_test.go b/pkg/kubectl/cmd/attach_test.go
index 1f4fd09f9dd..7fc4b7fe609 100644
--- a/pkg/kubectl/cmd/attach_test.go
+++ b/pkg/kubectl/cmd/attach_test.go
@@ -150,7 +150,7 @@ func TestAttach(t *testing.T) {
 			}),
 		}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: &unversioned.GroupVersion{Version: test.version}}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: test.version}}}
 		bufOut := bytes.NewBuffer([]byte{})
 		bufErr := bytes.NewBuffer([]byte{})
 		bufIn := bytes.NewBuffer([]byte{})
@@ -227,7 +227,7 @@ func TestAttachWarnings(t *testing.T) {
 			}),
 		}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: &unversioned.GroupVersion{Version: test.version}}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: test.version}}}
 		bufOut := bytes.NewBuffer([]byte{})
 		bufErr := bytes.NewBuffer([]byte{})
 		bufIn := bytes.NewBuffer([]byte{})
diff --git a/pkg/kubectl/cmd/drain_test.go b/pkg/kubectl/cmd/drain_test.go
index 10d2ef268fc..2f7086d67d4 100644
--- a/pkg/kubectl/cmd/drain_test.go
+++ b/pkg/kubectl/cmd/drain_test.go
@@ -165,7 +165,7 @@ func TestCordon(t *testing.T) {
 				}
 			}),
 		}
-		tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 		buf := bytes.NewBuffer([]byte{})
 		cmd := test.cmd(f, buf)
@@ -387,7 +387,7 @@ func TestDrain(t *testing.T) {
 				}
 			}),
 		}
-		tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 		buf := bytes.NewBuffer([]byte{})
 		cmd := NewCmdDrain(f, buf)
diff --git a/pkg/kubectl/cmd/exec_test.go b/pkg/kubectl/cmd/exec_test.go
index 627cbca03b8..8317db9367c 100644
--- a/pkg/kubectl/cmd/exec_test.go
+++ b/pkg/kubectl/cmd/exec_test.go
@@ -196,7 +196,7 @@ func TestExec(t *testing.T) {
 			}),
 		}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: &unversioned.GroupVersion{Version: test.version}}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: test.version}}}
 		bufOut := bytes.NewBuffer([]byte{})
 		bufErr := bytes.NewBuffer([]byte{})
 		bufIn := bytes.NewBuffer([]byte{})
diff --git a/pkg/kubectl/cmd/get_test.go b/pkg/kubectl/cmd/get_test.go
index d8ba37e2b91..4d4ac5e18b7 100644
--- a/pkg/kubectl/cmd/get_test.go
+++ b/pkg/kubectl/cmd/get_test.go
@@ -122,7 +122,7 @@ func TestGetUnknownSchemaObject(t *testing.T) {
 		Resp:  &http.Response{StatusCode: 200, Body: objBody(codec, &internalType{Name: "foo"})},
 	}
 	tf.Namespace = "test"
-	tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 	buf := bytes.NewBuffer([]byte{})
 
 	cmd := NewCmdGet(f, buf)
@@ -194,7 +194,7 @@ func TestGetUnknownSchemaObjectListGeneric(t *testing.T) {
 			}),
 		}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 		buf := bytes.NewBuffer([]byte{})
 		cmd := NewCmdGet(f, buf)
 		cmd.SetOutput(buf)
@@ -236,7 +236,7 @@ func TestGetSchemaObject(t *testing.T) {
 		Resp:  &http.Response{StatusCode: 200, Body: objBody(codec, &api.ReplicationController{ObjectMeta: api.ObjectMeta{Name: "foo"}})},
 	}
 	tf.Namespace = "test"
-	tf.ClientConfig = &client.Config{GroupVersion: &unversioned.GroupVersion{Version: "v1"}}
+	tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: "v1"}}}
 	buf := bytes.NewBuffer([]byte{})
 
 	cmd := NewCmdGet(f, buf)
@@ -461,7 +461,7 @@ func TestGetMultipleTypeObjectsAsList(t *testing.T) {
 		}),
 	}
 	tf.Namespace = "test"
-	tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 	buf := bytes.NewBuffer([]byte{})
 
 	cmd := NewCmdGet(f, buf)
diff --git a/pkg/kubectl/cmd/label_test.go b/pkg/kubectl/cmd/label_test.go
index ece2ae0b36b..5267bc3cc02 100644
--- a/pkg/kubectl/cmd/label_test.go
+++ b/pkg/kubectl/cmd/label_test.go
@@ -301,7 +301,7 @@ func TestLabelErrors(t *testing.T) {
 		f, tf, _ := NewAPIFactory()
 		tf.Printer = &testPrinter{}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 		buf := bytes.NewBuffer([]byte{})
 		cmd := NewCmdLabel(f, buf)
@@ -354,7 +354,7 @@ func TestLabelForResourceFromFile(t *testing.T) {
 		}),
 	}
 	tf.Namespace = "test"
-	tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 	buf := bytes.NewBuffer([]byte{})
 	cmd := NewCmdLabel(f, buf)
@@ -403,7 +403,7 @@ func TestLabelMultipleObjects(t *testing.T) {
 		}),
 	}
 	tf.Namespace = "test"
-	tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 
 	buf := bytes.NewBuffer([]byte{})
 	cmd := NewCmdLabel(f, buf)
diff --git a/pkg/kubectl/cmd/logs_test.go b/pkg/kubectl/cmd/logs_test.go
index 46a29c19dcc..caa867031b7 100644
--- a/pkg/kubectl/cmd/logs_test.go
+++ b/pkg/kubectl/cmd/logs_test.go
@@ -66,7 +66,7 @@ func TestLog(t *testing.T) {
 			}),
 		}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: &unversioned.GroupVersion{Version: test.version}}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: test.version}}}
 		buf := bytes.NewBuffer([]byte{})
 
 		cmd := NewCmdLogs(f, buf)
diff --git a/pkg/kubectl/cmd/portforward_test.go b/pkg/kubectl/cmd/portforward_test.go
index 9bcb2a995f0..eebda28b8de 100644
--- a/pkg/kubectl/cmd/portforward_test.go
+++ b/pkg/kubectl/cmd/portforward_test.go
@@ -84,7 +84,7 @@ func TestPortForward(t *testing.T) {
 			}),
 		}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: &unversioned.GroupVersion{Version: test.version}}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: test.version}}}
 		ff := &fakePortForwarder{}
 		if test.pfErr {
 			ff.pfErr = fmt.Errorf("pf error")
@@ -154,7 +154,7 @@ func TestPortForwardWithPFlag(t *testing.T) {
 			}),
 		}
 		tf.Namespace = "test"
-		tf.ClientConfig = &client.Config{GroupVersion: &unversioned.GroupVersion{Version: test.version}}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: &unversioned.GroupVersion{Version: test.version}}}
 		ff := &fakePortForwarder{}
 		if test.pfErr {
 			ff.pfErr = fmt.Errorf("pf error")
diff --git a/pkg/kubectl/cmd/rollingupdate.go b/pkg/kubectl/cmd/rollingupdate.go
index bf4015b6e62..14664310485 100644
--- a/pkg/kubectl/cmd/rollingupdate.go
+++ b/pkg/kubectl/cmd/rollingupdate.go
@@ -30,6 +30,7 @@ import (
 	"k8s.io/kubernetes/pkg/api/errors"
 	"k8s.io/kubernetes/pkg/api/meta"
 	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/apimachinery/registered"
 	"k8s.io/kubernetes/pkg/kubectl"
 	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
 	"k8s.io/kubernetes/pkg/kubectl/resource"
@@ -234,6 +235,7 @@ func RunRollingUpdate(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, arg
 	// than the old rc. This selector is the hash of the rc, which will differ because the new rc has a
 	// different image.
 	if len(image) != 0 {
+		codec := registered.GroupOrDie(client.APIVersion().Group).Codec
 		keepOldName = len(args) == 1
 		newName := findNewName(args, oldRc)
 		if newRc, err = kubectl.LoadExistingNextReplicationController(client, cmdNamespace, newName); err != nil {
@@ -248,14 +250,14 @@ func RunRollingUpdate(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, arg
 			if oldRc.Spec.Template.Spec.Containers[0].Image == image {
 				return cmdutil.UsageError(cmd, "Specified --image must be distinct from existing container image")
 			}
-			newRc, err = kubectl.CreateNewControllerFromCurrentController(client, client.Codec, cmdNamespace, oldName, newName, image, container, deploymentKey)
+			newRc, err = kubectl.CreateNewControllerFromCurrentController(client, codec, cmdNamespace, oldName, newName, image, container, deploymentKey)
 			if err != nil {
 				return err
 			}
 		}
 		// Update the existing replication controller with pointers to the 'next' controller
 		// and adding the <deploymentKey> label if necessary to distinguish it from the 'next' controller.
-		oldHash, err := api.HashObject(oldRc, client.Codec)
+		oldHash, err := api.HashObject(oldRc, codec)
 		if err != nil {
 			return err
 		}
diff --git a/pkg/kubectl/cmd/run_test.go b/pkg/kubectl/cmd/run_test.go
index 13024b5d6b4..520c7de30d3 100644
--- a/pkg/kubectl/cmd/run_test.go
+++ b/pkg/kubectl/cmd/run_test.go
@@ -264,7 +264,7 @@ func TestGenerateService(t *testing.T) {
 	for _, test := range tests {
 		sawPOST := false
 		f, tf, codec := NewAPIFactory()
-		tf.ClientConfig = &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+		tf.ClientConfig = &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 		tf.Client = &fake.RESTClient{
 			Codec: codec,
 			Client: fake.CreateHTTPClient(func(req *http.Request) (*http.Response, error) {
diff --git a/pkg/kubectl/rolling_updater_test.go b/pkg/kubectl/rolling_updater_test.go
index 982baad670b..4ba556847ad 100644
--- a/pkg/kubectl/rolling_updater_test.go
+++ b/pkg/kubectl/rolling_updater_test.go
@@ -1328,7 +1328,7 @@ func TestUpdateWithRetries(t *testing.T) {
 			}
 		}),
 	}
-	clientConfig := &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	clientConfig := &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 	client := client.NewOrDie(clientConfig)
 	client.Client = fakeClient.Client
 
@@ -1425,7 +1425,7 @@ func TestAddDeploymentHash(t *testing.T) {
 			}
 		}),
 	}
-	clientConfig := &client.Config{GroupVersion: testapi.Default.GroupVersion()}
+	clientConfig := &client.Config{ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 	client := client.NewOrDie(clientConfig)
 	client.Client = fakeClient.Client
 
diff --git a/plugin/pkg/scheduler/factory/factory_test.go b/plugin/pkg/scheduler/factory/factory_test.go
index d98f60d03ea..fb14a7929de 100644
--- a/plugin/pkg/scheduler/factory/factory_test.go
+++ b/plugin/pkg/scheduler/factory/factory_test.go
@@ -45,7 +45,7 @@ func TestCreate(t *testing.T) {
 	server := httptest.NewServer(&handler)
 	// TODO: Uncomment when fix #19254
 	// defer server.Close()
-	client := client.NewOrDie(&client.Config{Host: server.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	factory := NewConfigFactory(client, api.DefaultSchedulerName)
 	factory.Create()
 }
@@ -64,7 +64,7 @@ func TestCreateFromConfig(t *testing.T) {
 	server := httptest.NewServer(&handler)
 	// TODO: Uncomment when fix #19254
 	// defer server.Close()
-	client := client.NewOrDie(&client.Config{Host: server.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	factory := NewConfigFactory(client, api.DefaultSchedulerName)
 
 	// Pre-register some predicate and priority functions
@@ -106,7 +106,7 @@ func TestCreateFromEmptyConfig(t *testing.T) {
 	server := httptest.NewServer(&handler)
 	// TODO: Uncomment when fix #19254
 	// defer server.Close()
-	client := client.NewOrDie(&client.Config{Host: server.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	factory := NewConfigFactory(client, api.DefaultSchedulerName)
 
 	configData = []byte(`{}`)
@@ -150,7 +150,7 @@ func TestDefaultErrorFunc(t *testing.T) {
 	server := httptest.NewServer(mux)
 	// TODO: Uncomment when fix #19254
 	// defer server.Close()
-	factory := NewConfigFactory(client.NewOrDie(&client.Config{Host: server.URL, GroupVersion: testapi.Default.GroupVersion()}), api.DefaultSchedulerName)
+	factory := NewConfigFactory(client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}), api.DefaultSchedulerName)
 	queue := cache.NewFIFO(cache.MetaNamespaceKeyFunc)
 	podBackoff := podBackoff{
 		perPodBackoff:   map[types.NamespacedName]*backoffEntry{},
@@ -234,7 +234,7 @@ func TestBind(t *testing.T) {
 		server := httptest.NewServer(&handler)
 		// TODO: Uncomment when fix #19254
 		// defer server.Close()
-		client := client.NewOrDie(&client.Config{Host: server.URL, GroupVersion: testapi.Default.GroupVersion()})
+		client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 		b := binder{client}
 
 		if err := b.Bind(item.binding); err != nil {
@@ -320,7 +320,7 @@ func TestResponsibleForPod(t *testing.T) {
 	server := httptest.NewServer(&handler)
 	// TODO: Uncomment when fix #19254
 	// defer server.Close()
-	client := client.NewOrDie(&client.Config{Host: server.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: server.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	// factory of "default-scheduler"
 	factoryDefaultScheduler := NewConfigFactory(client, api.DefaultSchedulerName)
 	// factory of "foo-scheduler"
diff --git a/test/component/scheduler/perf/util.go b/test/component/scheduler/perf/util.go
index 5e74f94f300..7c5a1d5c190 100644
--- a/test/component/scheduler/perf/util.go
+++ b/test/component/scheduler/perf/util.go
@@ -51,10 +51,10 @@ func mustSetupScheduler() (schedulerConfigFactory *factory.ConfigFactory, destro
 	}))
 
 	c := client.NewOrDie(&client.Config{
-		Host:         s.URL,
-		GroupVersion: testapi.Default.GroupVersion(),
-		QPS:          5000.0,
-		Burst:        5000,
+		Host:          s.URL,
+		ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()},
+		QPS:           5000.0,
+		Burst:         5000,
 	})
 
 	schedulerConfigFactory = factory.NewConfigFactory(c, api.DefaultSchedulerName)
diff --git a/test/integration/client_test.go b/test/integration/client_test.go
index 70c529a5f53..32fe76767ea 100644
--- a/test/integration/client_test.go
+++ b/test/integration/client_test.go
@@ -43,7 +43,7 @@ func TestClient(t *testing.T) {
 
 	ns := api.NamespaceDefault
 	framework.DeleteAllEtcdKeys()
-	client := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	info, err := client.Discovery().ServerVersion()
 	if err != nil {
@@ -113,7 +113,7 @@ func TestSingleWatch(t *testing.T) {
 
 	ns := "blargh"
 	deleteAllEtcdKeys()
-	client := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	mkEvent := func(i int) *api.Event {
 		name := fmt.Sprintf("event-%v", i)
@@ -197,7 +197,7 @@ func TestMultiWatch(t *testing.T) {
 	defer s.Close()
 
 	ns := api.NamespaceDefault
-	client := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	dummyEvent := func(i int) *api.Event {
 		name := fmt.Sprintf("unrelated-%v", i)
diff --git a/test/integration/extender_test.go b/test/integration/extender_test.go
index ddb32d91e08..4d46221a089 100644
--- a/test/integration/extender_test.go
+++ b/test/integration/extender_test.go
@@ -197,7 +197,7 @@ func TestSchedulerExtender(t *testing.T) {
 	masterConfig := framework.NewIntegrationTestMasterConfig()
 	m = master.New(masterConfig)
 
-	restClient := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	restClient := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	extender1 := &Extender{
 		name:         "extender1",
diff --git a/test/integration/framework/master_utils.go b/test/integration/framework/master_utils.go
index 5a7dab1f15f..8500045c76f 100644
--- a/test/integration/framework/master_utils.go
+++ b/test/integration/framework/master_utils.go
@@ -100,7 +100,7 @@ func NewMasterComponents(c *Config) *MasterComponents {
 	if c.DeleteEtcdKeys {
 		DeleteAllEtcdKeys()
 	}
-	restClient := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion(), QPS: c.QPS, Burst: c.Burst})
+	restClient := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}, QPS: c.QPS, Burst: c.Burst})
 	rcStopCh := make(chan struct{})
 	controllerManager := replicationcontroller.NewReplicationManager(restClient, controller.NoResyncPeriodFunc, c.Burst)
 
diff --git a/test/integration/metrics_test.go b/test/integration/metrics_test.go
index eeafbbbdc9a..57f8aa826f7 100644
--- a/test/integration/metrics_test.go
+++ b/test/integration/metrics_test.go
@@ -107,7 +107,7 @@ func TestApiserverMetrics(t *testing.T) {
 
 	// Make a request to the apiserver to ensure there's at least one data point
 	// for the metrics we're expecting -- otherwise, they won't be exported.
-	client := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	if _, err := client.Pods(api.NamespaceDefault).List(api.ListOptions{}); err != nil {
 		t.Fatalf("unexpected error getting pods: %v", err)
 	}
diff --git a/test/integration/persistent_volumes_test.go b/test/integration/persistent_volumes_test.go
index 539041e0bdc..b3ff15fe9ea 100644
--- a/test/integration/persistent_volumes_test.go
+++ b/test/integration/persistent_volumes_test.go
@@ -45,9 +45,9 @@ func TestPersistentVolumeRecycler(t *testing.T) {
 	defer s.Close()
 
 	deleteAllEtcdKeys()
-	binderClient := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
-	recyclerClient := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
-	testClient := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	binderClient := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
+	recyclerClient := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
+	testClient := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	host := volume.NewFakeVolumeHost("/tmp/fake", nil, nil)
 
 	plugins := []volume.VolumePlugin{&volume.FakeVolumePlugin{"plugin-name", host, volume.VolumeConfig{}, volume.VolumeOptions{}}}
diff --git a/test/integration/scheduler_test.go b/test/integration/scheduler_test.go
index c5039df988b..21cf958f775 100644
--- a/test/integration/scheduler_test.go
+++ b/test/integration/scheduler_test.go
@@ -64,7 +64,7 @@ func TestUnschedulableNodes(t *testing.T) {
 	masterConfig := framework.NewIntegrationTestMasterConfig()
 	m = master.New(masterConfig)
 
-	restClient := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	restClient := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	schedulerConfigFactory := factory.NewConfigFactory(restClient, api.DefaultSchedulerName)
 	schedulerConfig, err := schedulerConfigFactory.Create()
@@ -307,7 +307,7 @@ func TestMultiScheduler(t *testing.T) {
 			- testPodNoAnnotation2 and testPodWithAnnotationFitsDefault2 shoule NOT be scheduled
 	*/
 	// 1. create and start default-scheduler
-	restClient := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	restClient := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	schedulerConfigFactory := factory.NewConfigFactory(restClient, api.DefaultSchedulerName)
 	schedulerConfig, err := schedulerConfigFactory.Create()
@@ -378,7 +378,7 @@ func TestMultiScheduler(t *testing.T) {
 	}
 
 	// 5. create and start a scheduler with name "foo-scheduler"
-	restClient2 := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	restClient2 := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	schedulerConfigFactory2 := factory.NewConfigFactory(restClient2, "foo-scheduler")
 	schedulerConfig2, err := schedulerConfigFactory2.Create()
@@ -464,7 +464,7 @@ func TestAllocatable(t *testing.T) {
 	m = master.New(masterConfig)
 
 	// 1. create and start default-scheduler
-	restClient := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	restClient := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 
 	schedulerConfigFactory := factory.NewConfigFactory(restClient, api.DefaultSchedulerName)
 	schedulerConfig, err := schedulerConfigFactory.Create()
diff --git a/test/integration/secret_test.go b/test/integration/secret_test.go
index 134b4a3125d..a1e5e7b2c0f 100644
--- a/test/integration/secret_test.go
+++ b/test/integration/secret_test.go
@@ -56,7 +56,7 @@ func TestSecrets(t *testing.T) {
 	m = master.New(masterConfig)
 
 	framework.DeleteAllEtcdKeys()
-	client := client.NewOrDie(&client.Config{Host: s.URL, GroupVersion: testapi.Default.GroupVersion()})
+	client := client.NewOrDie(&client.Config{Host: s.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}})
 	DoTestSecrets(t, client)
 }
 
diff --git a/test/integration/service_account_test.go b/test/integration/service_account_test.go
index a8bb1ac1852..278b9be300e 100644
--- a/test/integration/service_account_test.go
+++ b/test/integration/service_account_test.go
@@ -345,9 +345,9 @@ func startServiceAccountTestServer(t *testing.T) (*client.Client, client.Config,
 	}))
 
 	// Anonymous client config
-	clientConfig := client.Config{Host: apiServer.URL, GroupVersion: testapi.Default.GroupVersion()}
+	clientConfig := client.Config{Host: apiServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}}
 	// Root client
-	rootClient := client.NewOrDie(&client.Config{Host: apiServer.URL, GroupVersion: testapi.Default.GroupVersion(), BearerToken: rootToken})
+	rootClient := client.NewOrDie(&client.Config{Host: apiServer.URL, ContentConfig: client.ContentConfig{GroupVersion: testapi.Default.GroupVersion()}, BearerToken: rootToken})
 
 	// Set up two authenticators:
 	// 1. A token authenticator that maps the rootToken to the "root" user