We developed this url shortener, it will allow you to share links with your friends!

http://9a958a70ea8697789e52027dc12d7fe98cad7833.ctf.site:20000/

Hint

You will need to bypass the check for the hostname and send the request somewhere else!
Source code: https://paste.null-life.com/#/sGv1ZrIyhAAYCQMa6p8UFm2IFvzZhJ9yAYtkHgCcCz7bu8YE/66lTyw0