Broken link at whodunit pset4

[xikaos]

Hello guys!

I was trying to access a link referred by whodunit at problem set 4.

It happens that the link is returning a 400 bad request response, and with it, leaking some information about the webserver.

I also tried to issue the request via command line HTTP client and also had the same result.

I hope you guys fix the docs if the link doesn't exist or fix it, so people in the future doesn't get frustrated or so.

I also recommend you to remove the server HTTP header response.

See you guys out there!

[dmalan]

URL should be fixed, thank you!