文档地址：https://developers.weixin.qq.com/doc/offiaccount/User_Management/Get_users_basic_information_UnionID.html#UinonId

API接口：https://api.weixin.qq.com/cgi-bin/user/info/batchget?access_token=ACCESS_TOKEN

post 100 openid获取时会出现，每次在5秒中左右。有时候会出现报错，返回值是 {"errcode":-1,"errmsg":"system error rid: 616936da-785af055-10a59987"}