On 2 September 2011 21:38, Roy T. Fielding wrote:

 [http-bis]
>   OWS            = *( HTAB / SP / obs-fold )
>                    ; "optional" whitespace
>   obs-fold       = CRLF ( HTAB / SP )
>                    ; obsolete line folding

Clearer.  JFTR, this is still "avoid *any* folding", and not
"avoid more than one folding".  And if you like...

>   origin              = "Origin:" [ SP ] origin-list-or-null

...I wonder why you don't demote HTAB generally to "obsolete"
in OWS.  Or why you don't propose *WSP instead of [SP] in the
Origin header field.  It would be odd if the overall HTTPbis
rules and the specific Origin header field have different
ideas about "optional white space" (modulo <obs-fold>, i.e.,
eliminating <obs-fold> in a new header field Origin is fine).

One optional SP is not the same as zero or more ( HTAB / SP ).

-Frank
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