Ludic HTTP

418 I'm a teapot

The HTTP 418 I'm a teapot client error response code indicates that the server refuses to brew coffee because it is a teapot. This error is a reference of Hyper Text Coffee Pot Control Protocol which was an April Fools' joke in 1998

451 Unavailable For Legal Reasons:

I just discovered that HTTP status code 451 "Unavailable For Legal Reasons" exists. This number, in the 4xx "Client errors" range, is a reference to Ray Bradbury's Fahrenheit 451 in which books are illegal...