HTTP status codes / 4xx — Client error
418 I'm a teapot
What it means
The server refuses to brew coffee because it is, permanently, a teapot. Defined in RFC 2324 (April 1st, 1998) for the Hyper Text Coffee Pot Control Protocol.
What causes it
An easter egg. Some real services use it as a playful block for automated traffic.
How to fix it
Ask a coffee pot instead. If a real API returns 418, you have likely tripped its bot detection.