The HTTP 418 I'm a teapot status response code indicates that the server refuses to brew coffee because it is, permanently, a teapot.
A combined coffee/tea pot that is temporarily out of coffee should instead return 503.
This error is a reference to Hyper Text Coffee Pot Control Protocol defined in April Fools' jokes in 1998 and 2014.

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The HTTP 418 'I'm a teapot' status code indicates a server refuses to brew coffee because it is permanently a teapot. Originally defined as an April Fools' joke in RFC 2324 (1998), it was formally reserved in RFC 9110 due to widespread deployment. Some websites use it to reject requests they don't want to handle, such as automated queries.

418 I'm a teapot - HTTP