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It is an error as error 418 is returned if you attempt to communicate with a teapot over the "Hyper Text Coffee Pot Control Protocol", which, as the name implies, is only to be used to talk to coffee pots[0]. The protocol was extended in 2014 for teapot compatibility[1].

0: https://tools.ietf.org/html/rfc2324

1: https://tools.ietf.org/html/rfc7168

Exactly. Making it invalid for brewing coffee. The error is specifically for rejecting a BREW request sent to a teapot.

Hmmm, I thought I brewed tea all of the time. Should I be sending a STEEP command instead? I haven't read the docs on how to properly make a cup of tea.

Might Sir be interested in ISO3103?

( https://en.wikipedia.org/wiki/ISO_3103 )

Why yes. Very much so indeed. I don't know why (actually I do), but I read that in the voice of Stephen Fry.

400s are user errors ;)