[NNTP] Capabilities in responses (Was: MODE READER)

[Clive D.W. Feather]

Ken Murchison said:
>>>	S: 200 [STARTTLS] NNTP server, negotiate TLS now

>> I'm still thinking on this. As I said before, it isn't compatible with NNTP
>> as currently specified but that's not irretrievable.
> 
> I'm not sure why this would be incompatible.  Obviously the ABNF would 
> have to change to accomodate this, but from a client perspective it 
> wouldn't be a big deal.  For a client which handles this, it parses the 
> contents of "[ ... ]", otherwise, it looks just like trailing-comment.

The problem is the other way round: a conforming RFC 977 server can already
produce such responses with meaningless contents.

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