Answer: A teapot
HTTP status codes are usually reserved for serious problems such as server errors, missing files and other important issues. However, thanks to an April Fool's joke in April 1998, there is a particularly curious (and completely nonsensical) HTTP status code that indicates that the device being contacted is indeed a teapot.
How did such an odd code come about? On April 1
Among the many codes that are included in the HTCPCP error code schema, there is a code 418 ("I'm a teapot") that politely informs the recipient that the device he's using to cook coffee Trying to actually have a teapot and the device can not produce coffee they crave.
As you can imagine, the error code was never formally added to the HTTP error code schema, and if you actually get the code, you either hit a webmaster with a sense of humor or a true Internet-enabled brewing machine by a hobbyist with a penchant for the pranks of the April fools of yesterday