使用post请求 https://qyapi.weixin.qq.com/cgi-bin/user/getuserdetail?access_token=%s

返回 {"errcode":40063,"errmsg":"Warning: wrong json format. some parameters are empty, hint: [1621497762_148_74faa764a9ccf6f519206f4eab38fcf0], from ip: 119.27.164.16, more info at https://open.work.weixin.qq.com/devtool/query?e=40063"}

Content-Type 设置为 application/json

请问具体是什么原因？