On Thu, Feb 8, 2018 at 5:22 AM, John R. Levine <jo...@iecc.com> wrote:

> someone asked me about case sensitiveness of the header field name.  I
>> looked
>> for an ABNF in RFC6376, but only found examples and informative notes.
> I was going to say that can't possibly be true, but it's true, there's no
> ABNF for the header.  So, for example, I don't know whether the v= field
> has to come first.  Send an erratum, we'll probably accept it as hold for
> update.

"v=1" doesn't have to come first.  It just usually does.  I think there was
a version of RFC4871 that did that, but then when challenged we couldn't
come up with a good reason to keep it that way.

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