This challenge only gives us this webpage:
Taking a look at the source code we can see a page written as a comment.
<html>
<head>
<link rel="stylesheet" href="/static/style.css">
<!--/sup3r-admin-->
</head>
<body>
<h1>
<center>Where do I go?</center>
</h1>
</body>
</html>
Going to the “/sup3r-admin” page redirects us to “/home” that just has the text “Try harder…” instead of “Where do I go?”. Going on the name of the challenge I thought that maybe sending a POST request to that page would do something. Sending a POST request to the “/sup3r-admin” page the site returned the flag(abso-ctf{4s_s1mpl3_4s_th4t_P0st_r3qu3st}).