docs: @NoAuth
      @RequestMapping(value = "/item", method = RequestMethod.GET)
      @ResponseBody
      public ValueVo getItem(ConfForm confForm) {
  
          LOG.info(confForm.toString());
  
          //
          // 校验
          //
          ConfigFullModel configModel = null;
          try {
              configModel = configValidator4Fetch.verifyConfForm(confForm, false);
          } catch (Exception e) {
              LOG.warn(e.toString());
              return ConfigUtils.getErrorVo(e.getMessage());
          }
  
          return configFetchMgr.getConfItemByParameter(configModel.getApp().getId(), configModel.getEnv().getId(),
                  configModel.getVersion(), configModel.getKey());
      }