+++WARNING+++
+++YOU HAVE MADE A BAD REQUEST+++
+++THIS CAN BE FORGIVEN+++
+++BE STRONG IN YOUR IGNORANCE+++

By order of His Majesty
The God Emperor of Terra

Your Clearance Code has been logged ( 38.103.63.55 ) and passed to an ever-vigilant agent of
His Most Holy Inquisition.

Lord Inquisitor Nocens Prex (Dept. 400) does not tolerate malformed data streams. For those who seek perfection there can be no rest this side of the grave. He will labour mightily to resolve this grevious error, and will endeavour not to hold you, and your world, ultimately responsible. Exterminatus cannot, however, be ruled out at this stage.
Ignorance is a virtue.
Excuses are the refuge of the weak.
The Lord Inquisitor is currently out of the office.

To be Malformed
That is the mark of the mutant
To be Non-Compliant with HTTP Protocol
That is the mark of the way-over-my-head
To be a Bad Request
That is the mark of the 400