Challenge

A download site that gates a file behind what looks like an authentication step.

Solution

The gate is only in the link you are meant to follow, not on the endpoint itself. Requesting the page directly hands over the flag.

http://host3.metaproblems.com:5960/authenticated_flag_download_page.php

Flag

MetaCTF{w3_hope_you_enj0y_this_fl@g}