diff --git a/vendor/k8s.io/kubernetes/pkg/apis/admissionregistration/validation/validation.go b/vendor/k8s.io/kubernetes/pkg/apis/admissionregistration/validation/validation.go
index d6e45cb292bc..a6e862366b06 100644
--- a/vendor/k8s.io/kubernetes/pkg/apis/admissionregistration/validation/validation.go
+++ b/vendor/k8s.io/kubernetes/pkg/apis/admissionregistration/validation/validation.go
@@ -189,9 +189,6 @@ func validateExternalAdmissionHook(hook *admissionregistration.ExternalAdmission
 	if len(hook.Name) == 0 {
 		allErrors = append(allErrors, field.Required(fldPath.Child("name"), ""))
 	}
-	if errs := validationutil.IsDNS1123Subdomain(hook.Name); len(errs) > 0 {
-		allErrors = append(allErrors, field.Invalid(fldPath.Child("name"), hook.Name, strings.Join(errs, ",")))
-	}
 	if len(strings.Split(hook.Name, ".")) < 3 {
 		allErrors = append(allErrors, field.Invalid(fldPath.Child("name"), hook.Name, "should be a domain with at least two dots"))
 	}
diff --git a/vendor/k8s.io/kubernetes/plugin/pkg/admission/webhook/admission.go b/vendor/k8s.io/kubernetes/plugin/pkg/admission/webhook/admission.go
index ac192abd4027..0febfdfc30fb 100644
--- a/vendor/k8s.io/kubernetes/plugin/pkg/admission/webhook/admission.go
+++ b/vendor/k8s.io/kubernetes/plugin/pkg/admission/webhook/admission.go
@@ -45,6 +45,8 @@ import (
 	"k8s.io/kubernetes/pkg/kubeapiserver/admission/configuration"
 
 	// install the clientgo admission API for use with api registry
+	"strings"
+
 	_ "k8s.io/kubernetes/pkg/apis/admission/install"
 )
 
@@ -230,8 +232,14 @@ func (a *GenericAdmissionWebhook) callHook(ctx context.Context, h *v1alpha1.Exte
 	if err != nil {
 		return &ErrCallingWebhook{WebhookName: h.Name, Reason: err}
 	}
+
+	tokens := strings.SplitN(h.Name, "/", 2)
+	urlPath := ""
+	if len(tokens) == 2 {
+		urlPath = tokens[1]
+	}
 	response := &admissionv1alpha1.AdmissionReview{}
-	if err := client.Post().Context(ctx).Body(&request).Do().Into(response); err != nil {
+	if err := client.Post().Context(ctx).AbsPath(urlPath).Body(&request).Do().Into(response); err != nil {
 		return &ErrCallingWebhook{WebhookName: h.Name, Reason: err}
 	}
 
diff --git a/vendor/k8s.io/kubernetes/plugin/pkg/admission/webhook/admission_test.go b/vendor/k8s.io/kubernetes/plugin/pkg/admission/webhook/admission_test.go
index 1e0aba1863d4..341281a2d33a 100644
--- a/vendor/k8s.io/kubernetes/plugin/pkg/admission/webhook/admission_test.go
+++ b/vendor/k8s.io/kubernetes/plugin/pkg/admission/webhook/admission_test.go
@@ -171,7 +171,7 @@ func TestAdmit(t *testing.T) {
 		"match & disallow": {
 			hookSource: fakeHookSource{
 				hooks: []registrationv1alpha1.ExternalAdmissionHook{{
-					Name:         "disallow",
+					Name:         "disallow/disallow",
 					ClientConfig: ccfg,
 					Rules:        matchEverythingRules,
 				}},
@@ -182,7 +182,7 @@ func TestAdmit(t *testing.T) {
 		"match & disallow ii": {
 			hookSource: fakeHookSource{
 				hooks: []registrationv1alpha1.ExternalAdmissionHook{{
-					Name:         "disallowReason",
+					Name:         "disallowReason/disallowReason",
 					ClientConfig: ccfg,
 					Rules:        matchEverythingRules,
 				}},