func (c completedConfig) New() (*Master, error) {

   //  register /api
   m.InstallLegacyAPI(c.Config, c.Config.GenericConfig.RESTOptionsGetter, legacyRESTStorageProvider)
   //  register /apis
   m.InstallAPIs(c.Config.APIResourceConfigSource, c.Config.GenericConfig.RESTOptionsGetter, restStorageProviders...)
}

func (m *Master) InstallLegacyAPI(c *Config, restOptionsGetter generic.RESTOptionsGetter, legacyRESTStorageProvider corerest.LegacyRESTStorageProvider) {
    legacyRESTStorage, apiGroupInfo, err := legacyRESTStorageProvider.NewLegacyRESTStorage(restOptionsGetter)
    m.GenericAPIServer.InstallLegacyAPIGroup(genericapiserver.DefaultLegacyAPIPrefix, &apiGroupInfo)

func (s *GenericAPIServer) InstallLegacyAPIGroup(apiPrefix string, apiGroupInfo *APIGroupInfo) error {
    s.installAPIResources(apiPrefix, apiGroupInfo)
}

func (m *Master) InstallAPIs(apiResourceConfigSource serverstorage.APIResourceConfigSource, restOptionsGetter generic.RESTOptionsGetter, restStorageProviders ...RESTStorageProvider) {
	for i := range apiGroupsInfo {
		m.GenericAPIServer.InstallAPIGroup(&apiGroupsInfo[i])	}
}

func (s *GenericAPIServer) InstallAPIGroup(apiGroupInfo *APIGroupInfo) error {
    s.installAPIResources(APIGroupPrefix, apiGroupInfo)
}

func (s *GenericAPIServer) installAPIResources(apiPrefix string, apiGroupInfo *APIGroupInfo) error {
	for _, groupVersion := range apiGroupInfo.GroupMeta.GroupVersions {
		apiGroupVersion.InstallREST(s.HandlerContainer.Container)
	}
}

func (g *APIGroupVersion) InstallREST(container *restful.Container) error {
	installer := g.newInstaller()
	// 新建一个WebService
	ws := installer.NewWebService()

	// 关键, URL注册, add router into ws
	apiResources, registrationErrors := installer.Install(ws)
	lister := g.ResourceLister
	if lister == nil {
		lister = staticLister{apiResources}
	}
	AddSupportedResourcesWebService(g.Serializer, ws, g.GroupVersion, lister)

	// container.add(webservice)
	container.Add(ws)
	return utilerrors.NewAggregate(registrationErrors)
}