The status code 418, also known as "I'm a teapot", is a humorous error code used in the Hypertext Transfer Protocol (HTTP). It's not intended to be a serious error message.
Imagine you try to request a cup of coffee from a server. If the server is actually a teapot and not equipped to brew coffee, it might respond with a 418 code, indicating that it's not the right appliance for the task.
This code was defined in 1998 as part of an April Fool's joke in an RFC document outlining a fictional "Hyper Text Coffee Pot Control Protocol". You won't typically encounter this code in everyday browsing as it's not widely implemented by servers.