418 I'm a teapot
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Stands for: Hyper Text Coffee Pot Control Protocol (HTCPCP)
An April Fools' HTTP status code, defined in 1998, returned by a teapot asked to brew coffee.
RFC 2324 invented the Hyper Text Coffee Pot Control Protocol and its 418 status as a joke, but the code took on a life of its own and is widely implemented as an Easter egg. Attempts to remove 418 from real frameworks in 2017 provoked enough backlash that it was kept and later reserved by the IETF.
Also known as: HTCPCP, I'm a teapot, HTTP 418