Ambiguities in header-field rules (p1-messaging)
Frank Mertens <frank@cyblogic.de> Wed, 17 August 2011 17:59 UTC
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Date: Wed, 17 Aug 2011 19:58:21 +0200
From: Frank Mertens <frank@cyblogic.de>
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Subject: Ambiguities in header-field rules (p1-messaging)
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Resent-Date: Wed, 17 Aug 2011 17:59:28 +0000
Hi,
I played around with the ABNF published by this WG and stumbled
over some rough edges.
Current rules:
OWS = *( [ obs-fold ] WSP )
header-field = field-name ":" OWS [ field-value ] OWS
field-value = *( field-content / OWS )
field-content = *( WSP / VCHAR / obs-text )
Problems:
- field-value and field-content match the empty symbol,
which requires searching for the longest match, which is costly
(and confusing for the human reader)
- because field-value matches the empty symbol claiming it optional
in header-field allows ambiguous productions of same length
(with or without field-value of zero length?)
Suggested improvement:
field-value = 1*( field-content OWS )
field-content = 1*( VCHAR / WSP / obs-text )
Best Regards,
Frank Mertens.
- Ambiguities in header-field rules (p1-messaging) Frank Mertens
- Re: Ambiguities in header-field rules (p1-messagi… Amos Jeffries
- Re: Ambiguities in header-field rules (p1-messagi… Frank Mertens
- Re: Ambiguities in header-field rules (p1-messagi… Frank Mertens
- Re: Ambiguities in header-field rules (p1-messagi… Amos Jeffries
- Re: Ambiguities in header-field rules (p1-messagi… Frank Mertens
- Re: Ambiguities in header-field rules (p1-messagi… Roy T. Fielding
- Re: Ambiguities in header-field rules (p1-messagi… Julian Reschke