apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/controller/ItemController.java/ItemController/modifyItemsByText
class ItemController:  @PreAuthorize(value = "@permissionValidator.hasModifyNamespacePermission(#appId, #namespaceName, #env)")
  @PutMapping(value = "/apps/{appId}/envs/{env}/clusters/{clusterName}/namespaces/{namespaceName}/items", consumes = {
      "application/json"})
  public void modifyItemsByText(@PathVariable String appId, @PathVariable String env,
                                @PathVariable String clusterName, @PathVariable String namespaceName,
                                @RequestBody NamespaceTextModel model) {
    model.setAppId(appId);
    model.setClusterName(clusterName);
    model.setEnv(env);
    model.setNamespaceName(namespaceName);

    configService.updateConfigItemByText(model);
  }