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418 is defined as HTTP response code 418 "I'm a teapot" as an April Fools' joke.

The response code is produced when you ask a teapot to make coffee using HTCPCP! Hence the error description “The server refuses to brew coffee because it is a teapot.” While not seen on, one can reproduce this error code by using this URL or creating a web server which returns response code 418 in a repl (in Flask, this can be done with flask.abort(418) ). It is also Dart's favourite error code.