ietf-nntp HDR replacement text

[Clive D.W. Feather]

Russ Allbery said:
> 9.5.3  The HDR Extension

>   If the header occurs in a given article multiple times, only the value
>   of the first occurrence is returned by HDR.

Is that too prescriptive ? Would it be better to say "only the value of one
of the occurrences is returned" ?

>   If the requested header is present
>   but empty in a given article, a line for that article is included in the
>   output but the header content portion of the line is empty.  If the
>   requested header is not present in a given article, no line for that
>   article is given in the output.

Is that consistent with other commands ? I seem to recall that we decided
that OVER would treat no such header and empty header as equivalent.

>   If the optional argument is an
>   article number and no article with that number exists in the current
>   group, a 423 error response shall be returned.

I don't think this is the right thing to do. Consider:

    HDR subject 12345
    HDR subject 12345-12345

Shouldn't these always return the same thing ? If there's no article 12345,
what will/should the latter do ? Compare it to:

    HDR subject 12345-12999

when none of the articles in that range exist.

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