code: private String checkLogin(String uuid) {
          String uid  = null != uuid ? uuid : this.uuid;
          String url  = String.format("%s/cgi-bin/mmwebwx-bin/login", Constant.BASE_URL);
          Long   time = System.currentTimeMillis();
  
          ApiResponse response = this.client.send(new StringRequest(url)
                  .add("loginicon", true).add("uuid", uid)
                  .add("tip", "1").add("_", time)
                  .add("r", (int) (-time / 1000) / 1579)
                  .timeout(30));
  
          Matcher matcher = CHECK_LOGIN_PATTERN.matcher(response.getRawBody());
          if (matcher.find()) {
              if (StateCode.SUCCESS.equals(matcher.group(1))) {
                  if (!this.processLoginSession(response.getRawBody())) {
                      return StateCode.FAIL;
                  }
                  return StateCode.SUCCESS;
              }
              return matcher.group(1);
          }
          return StateCode.FAIL;
      }
docs: 检查是否登录
  
  @param uuid 二维码uuid
  @return 返回登录状态码