[ietf-nntp] AUTHINFO draft 01

[Clive D.W. Feather]

>>> 2.2.1: we discussed briefly a separate response code meaning "invalid
>>> base64 string". The logical code for this is 504 (it belongs in the 50x
>>> space and this is the next unused code). There's still time to put that
>>> in [NNTP], incidentally.
>> I have no objections to this.  It seems like a reasonable idea.
> Done.

Jeff: the productions base64 etc. are now in [NNTP]:

     base64 = *(4base64-char) [base64-terminal]                
     base64-char = UPPER / LOWER / DIGIT / "+" / "/"
     base64-terminal = 2base64-char "==" / 3base64-char "="    
   
That doesn't stop you including them yourself, but in particular it means
you needn't worry about LOWER.

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