speed up namespace lookup

http/handler/kubernetes/handler.go

@@ -25,5 +25,8 @@ func NewHandler(notaryService *security.NotaryService, kubernetesDeployer *exec.
 	h.Handle("/kubernetes/stack",
 		notaryService.DigitalSignatureVerification(httperror.LoggerHandler(h.kubernetesDeploy))).Methods(http.MethodPost)
 
+	h.Handle("/kubernetes/namespaces",
+		notaryService.DigitalSignatureVerification(httperror.LoggerHandler(h.kubernetesGetNamespaces))).Methods(http.MethodGet)
+
 	return h
 }

http/handler/kubernetes/kubernetes_namespaces.go

@@ -0,0 +1,33 @@
+package kubernetes
+
+import (
+	"fmt"
+	"net/http"
+
+	httperror "github.com/portainer/portainer/pkg/libhttp/error"
+	"github.com/portainer/portainer/pkg/libhttp/request"
+	"github.com/portainer/portainer/pkg/libhttp/response"
+)
+
+type getNamespacePayload struct{}
+
+func (payload *getNamespacePayload) Validate(r *http.Request) error {
+
+	return nil
+}
+
+func (handler *Handler) kubernetesGetNamespaces(rw http.ResponseWriter, r *http.Request) *httperror.HandlerError {
+	var payload getNamespacePayload
+	err := request.DecodeAndValidateJSONPayload(r, &payload)
+	if err != nil {
+		return httperror.BadRequest("Invalid request payload", err)
+	}
+
+	for _, header := range r.Header {
+		for _, value := range header {
+			fmt.Println("Header:", value)
+		}
+	}
+
+	return response.Empty(rw)
+}