Get aHEAD

Click the link and I then first inspected the HTML, I didn’t see much to help so I ran Burp to interpret and inspect the packets.

When the page loaded with burp suite we had a GET request for the red page ![[getonred.png]]
and a POST request for the blue page, and the hints suggest to use burp and lookd at the maybe this is where the difference is.
![[postonblue.png]]
A little research on Header responses was needed
https://www.w3schools.com/tags/ref_httpmethods.asp

And then to be lost, turns out you can use the curl -I command to get the response headers which popos the flag out.