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.
418 I'm a teapot
| Specification | Title |
|---|---|
| RFC 2324, section 2.3.2: 418 I'm a teapot | Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0): Semantics and Content |
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https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/418