Shiro下ajax后台收不到信息

Question

问题遇到的现象和发生背景

登录界面时，要求后端生成验证码

操作环境、软件版本等信息

shiro1.7.1

尝试过的解决方法

我想要达到的结果

Answer 1

Request URL: http://139.224.186.229:8098/day_1_12/VerifyCodeServlet
Request Method: POST
Status Code: 500
Remote Address: 139.224.186.229:8098
Referrer Policy: strict-origin-when-cross-origin
Connection: close
Content-Language: en
Content-Length: 7172
Content-Type: text/html;charset=utf-8
Date: Wed, 16 Feb 2022 08:23:43 GMT
Set-Cookie: shiro.sesssion=59946884-dc58-46c4-bb05-74a8c93567ff; Path=/; Max-Age=2592000; Expires=Fri, 18-Mar-2022 08:23:43 GMT; HttpOnly; SameSite=lax
Accept: /
Accept-Encoding: gzip, deflate
Accept-Language: zh-TW,zh;q=0.9,en-US;q=0.8,en;q=0.7
Connection: keep-alive
Content-Length: 0
Cookie: JSESSIONID=833CAADF16974608E0D6CC2B646C7FE2
Host: 139.224.186.229:8098
Origin: http://139.224.186.229:8098
Referer: http://139.224.186.229:8098/login
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/98.0.4758.82 Safari/537.36
X-Requested-With: XMLHttpRequest