根据提示cookie，打开F12开发人员工具，在cookie中找到Cookie:
    look-here=cookie.php
    接着访问cookie.php，提示See the http response，最终在http响应头中找到flag

    1. HTTP/1.1 200 OK
    2. Date: Thu, 19 Nov 2020 02:36:49 GMT
    3. Server: Apache/2.4.7 (Ubuntu)
    4. X-Powered-By: PHP/5.5.9-1ubuntu4.26
    5. flag: cyberpeace{b387cd28c55e3ca3a2dd4d9b78272deb}
    6. Vary: Accept-Encoding
    7. Content-Encoding: gzip
    8. Content-Length: 253
    9. Keep-Alive: timeout=5, max=100
    10. Connection: Keep-Alive
    11. Content-Type: text/html