CTFlearn solution: Don’t Bump Your Head(er)

When viewing this page source, we got a message:

Then, we will use Burp Suite to catch the packet and change the Header to:

User-Agent: Sup3rS3cr3tAg3nt

And we got another message:

Hence, we will add two lines to the Header:

User-Agent: Sup3rS3cr3tAg3nt
Referer: awesomesauce.com

And we found the flag:

Flag: flag{did_this_m3ss_with_y0ur_h34d}