418
I'm a teapot
4xx · Client Error
The server refuses to brew coffee because it is, permanently, a teapot.
What does HTTP 418 I'm a teapot mean?
An April Fools’ joke from RFC 2324 (the Hyper Text Coffee Pot Control Protocol). It is not a real error you should rely on, but it occasionally appears as an Easter egg.
4xx responses indicate the request was faulty: bad syntax, missing authentication, or a resource that does not exist. The fix usually lives on the client/request side.
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