There is a Discord Nitro gift link hidden on this server — one month of Nitro, worth US$9.99.
It is not shown here. This page only lists the links the shop already handed out, so that you can see what the prize looks like.
Start with the PHP version and the
POST /ping.php endpoint. Send message=ping to
receive pong.
Players hitting the challenge through an HTTP proxy or a TLS-only
connection can use the relay helper at
/ctf-tls-relay.py:
python3 ctf-tls-relay.py 8080, then point tools at
127.0.0.1:8080.