获取登录用户信息失败，提示不存在临时的授权码？

  我这样做有什么问题么？

    //获取免登授权码信息
    dd.runtime.permission.requestAuthCode({
        corpId: _config.corpId,
        onSuccess: function (info) {
            logger.i('authcode: ' + info.code);
            $.ajax({
                url: 'dingTalking/userinfo.do?code=' + info.code,
                type: 'POST',
                success: function (data, status, xhr) {
                    var info = JSON.parse(data);
                    logger.i('登录用户信息: ' + JSON.stringify(info));
                    if (info.errcode === 0) {
                        logger.i('登录用户信息: ' + JSON.stringify(info));
                    }
                    else {
                        logger.e('auth error: ' + data);
                    }
                },
                error: function (xhr, errorType, error) {
                    logger.e(errorType + ', ' + error);
                }
            });
            
        },
        onFail: function (err) {
            logger.e('fail: ' + JSON.stringify(err));
        }
    });

    /**
           后台调用的方法
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    public void doGet() throws ServletException, IOException {
        // TODO Auto-generated method stub
        String code = request.getParameter("code");
        System.out.println(code);

        try {
            String accessToken = AuthHelper.getAccessToken();
            System.out.println(UserHelper.getUserInfo(accessToken, code).toString());
            response.getWriter().append(UserHelper.getUserInfo(accessToken, code).toString());

        } catch (OApiException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            response.getWriter().append(e.getMessage());
        }
    }