On 2/8/2018 5:22 AM, John R. Levine wrote:
someone asked me about case sensitiveness of the header field name. I
for an ABNF in RFC6376, but only found examples and informative notes.
Header field name rules are in RFC 5322. That deals with case
sensitivity for field name strings. Section 1.2.2 provides the basis
for knowing whether a defined string is to be parsed in a case sensitive
or insensitive manner.
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.
In RFC 6376, note Section 3.2 on tag lists. The ABNF shows no
sensitivity to ordering. (The linkage to DKIM-Signature is Section 3.5,
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