ietf-nntp Response codes - debugging, authentication & unknown

[Clive D.W. Feather]

Lee Kindness said:
>    If a client receives 
>    an unexpected response code from a command then it MUST use
>    the first digit of the response to determine the result. For
>    example 2xx would be a successful response, 4xx and 5xx
>    unsuccessful.

This forbids a client from saying "This server is broken, I'm quitting.".
It also forbids it from saying "Oh, I know what a 407 response is: in this
context it's really a success".

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