code: private String pushLogin() {
          String uin = this.client.cookie("wxUin");
          if (StringUtils.isEmpty(uin)) {
              return null;
          }
          String url = String.format("%s/cgi-bin/mmwebwx-bin/webwxpushloginurl?uin=%s",
                  Constant.BASE_URL, uin);
  
          JsonResponse jsonResponse = this.client.send(new JsonRequest(url));
          return jsonResponse.getString("uuid");
      }
docs: 推送登录
  
  @return 返回uuid