// REFERENCE
418 I'm a teapot
Class: 4xx
A joke code (RFC 2324, «teapot»): a teapot can't brew coffee. Not used in production, but some APIs return it as an easter egg or for playfully rejected requests.
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400
400 Bad Request 401
401 Unauthorized (not authenticated) 403
403 Forbidden (access denied) 404
404 Not Found 405
405 Method Not Allowed 406
406 Not Acceptable
400 Bad Request 401
401 Unauthorized (not authenticated) 403
403 Forbidden (access denied) 404
404 Not Found 405
405 Method Not Allowed 406
406 Not Acceptable
Semantics per RFC 9110 and the IANA status code registry. Educational content.