What happens if a teapot receives a request meant for a coffee maker?

In this exact situation, 418 is the correct response—it's the one that fits the whole joke. But if we're being serious, a 400 Bad Request could work too, since the teapot wouldn’t understand what to do with a coffee maker instruction. And yeah, many IoT devices use REST APIs.

It might depend on the request format. If the method signature is off, it could lead to a 404 Not Found. If the instructions create an error, a 500 Internal Server Error could be sent. Technically, you can return any code you want, but the teapot won’t know it’s supposed to be for a coffee maker.

The teapot has to answer as a teapot. If it has a universal API for different functions, it might return 418 for some calls and maybe even a 200 OK for others that it can process. But for the coffee part, a Bad Request is likely!

The teapot can't understand that the instruction was meant for a coffee maker. If the required information isn’t there, it could return a 400. If the request is directed to an invalid URL, a 404 could happen. There’s even a chance it could return a 200 OK if it partially accepted the request. It's all pretty flexible!

Actually, if we're discussing the correct error code, a 400 is straightforward since it indicates a bad request. But some might argue a 422 Unprocessable Entity could fit better if the request format is technically correct but not applicable.