await this.post('/userloginex.php?action=login&cid=0&notice=0')
            .set('referer', 'http://acm.hdu.edu.cn/userloginex.php')
            .send({
                username: ***,
                userpass: ***,
                login: 'Sign In',
            });

报错

https://www.luogu.com.cn/paste/2o51m2nk

本地post得到的数据：

HTTP/1.1 302 Found
Content-Type: text/html;charset=GB2312
Connection: keep-alive
Server: *************
Date: Wed, 28 Jun 2023 02:28:27 GMT
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Vary: Accept-Encoding
location: 
Content-Length: 0