Parenthesized text is optional.
From-domain = "FROM" FWS Extended-Domain CFWS
Extended-Domain = Domain /
( Domain FWS "(" TCP-info ")" ) /
( Address-literal FWS "(" TCP-info ")" )
in this case domain matches "Domain" (and thouse matches
Extended-Domain) and parenthesized text matches CFWS.
22.04.2018 0:31, Steve Atkins пишет:
>
>> On Apr 21, 2018, at 10:27, Vladimir Dubrovin via mailop <mailop@mailop.org>
>> wrote:
>>
>>
>> According to RFC 2822, text in () represents comment (see section 3.2.3) and
>> is used in the place where RFC2821 allows CFWS. CWFS is allowed to contain a
>> comment (it's what differs FWS from CFWS).
>>
>> So, while this format is not optimal for automated parsing, it does not
>> violate RFCs.
> Check the grammar for trace headers specifically - the parenthesized text
> there isn’t CFWS and does have a defined structure.
>
> (Why it’s that way I have no idea - standardizing grammar that’s compatible
> with what was previously common use, maybe?)
>
> Cheers,
> Steve
>
>
>
> _______________________________________________
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> mailop@mailop.org
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--
Vladimir Dubrovin
@Mail.Ru
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