Level 4 of OverTheWire’s Natas wargame starts a little different than the previous levels. It immediately presents you with an error message.

I figured this was going to be due to the HTTP Referer. I guessed that one could solve this by using a proxy or a browser addon, such as Referer Control, but I simply didn’t want to install anything new. I opened a bash window, and simulated my original HTTP GET.

Since I was then able to reproduce the error, I changed the HTTP Referer, and got the level 5 password.