apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/api/AdminServiceAPI.java/AdminServiceAPI/deleteAppNamespace
class AdminServiceAPI:    public void deleteAppNamespace(Env env, String appId, String namespaceName, String operator) {
      restTemplate.delete(env, "/apps/{appId}/appnamespaces/{namespaceName}?operator={operator}", appId, namespaceName,
          operator);
    }