HTTP 418 I'm A Teapot is defined in RFC 2342 - Hyper Text Coffee Pot Control Protocol (HTCPC/1.0). It's intended to be returned whenever a teapot is asked to brew coffee.
The BBC's 404 error is one of the last remaining places where you can see Bubbles the Clown, known by Brits of a sufficient age from the BBC Test Card.
Unfortunately, this teapot server doesn't implement most of the commands from the spec. When you try to send a BREW, PROPFIND, or WHEN request, it returns a 405 error (method not allowed). When you POST, it replies that a length is required (411 error), but using post instead of BREW is deprecated.
Tss. What a bad teapot implementation.
HTTP error code 418 is defined as "I am a teapot".
That originates from an Internet Engineering Task Force (IETF) April fools' joke.
I've always been curious... how does Google manage routing of their main domain name? google.com/_____ has so many paths that must be served by so many programs running on so many different machines.
Probably some routing at the load balancer level. That is not uncommon.