[NNTP] LISTGROUP

[Clive D.W. Feather]

Mark Crispin said:
>> * Still undecided what to do if:
>>  - the range is inverted (e.g. 5-1).
> 
> I'll argue, weakly, that 5-1 should be the same as 1-5.

I disagree.

> I will, however, argue that if 5-1 is not the same as 1-5, then it should 
> be a protocol syntax error and *not* equivalent to 5 or an empty range.

I'm agnostic.

> I understand that some servers treat 5-1 as equivalent to 5.  That 
> behavior should *NOT* be required of future implementations.  We can 
> declare it to be a syntax error without breaking those servers; since if 
> it is a syntax error then it's the client's responsibility not to send it. 
> The server's behavior then falls under the category of GIGO (garbage in, 
> garbage out) and thus acceptable.

Wrong: if it's a syntax error, the server MUST return a 501 response.

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