El Lunes, 16 de Febrero de 2009, Iñaki Baz Castillo escribió:
> Hi, Accept header allows parameters in a confusing way:
>
> -----------------------
> Accept = "Accept" HCOLON
> [ accept-range *(COMMA accept-range) ]
> accept-range = media-range *(SEMI accept-param)
> media-range = ( "*/*"
> / ( m-type SLASH "*" )
> / ( m-type SLASH m-subtype )
> ) *( SEMI m-parameter )
> accept-param = ("q" EQUAL qvalue) / generic-param
> qvalue = ( "0" [ "." 0*3DIGIT ] )
> / ( "1" [ "." 0*3("0") ] )
> generic-param = token [ EQUAL gen-value ]
> gen-value = token / host / quoted-string
>
> m-parameter = m-attribute EQUAL m-value
> m-attribute = token
> m-value = token / quoted-string
> --------------------------
>
> Take the following example:
>
> Accept: application/sdp;q=0.5;paramX=qwe
>
> Accorsing to the BNF syntax it's not possible to know if "q=0.5"
> and "paramX=qwe" are 'accept-param' or 'm-parameter' (they could be both
> with no way to differentiate between them).
As a workaround I've changed the BNF as follows:
BEFORE:
Accept = "Accept" HCOLON [ accept-range *(COMMA accept-range) ]
accept-range = media-range *(SEMI accept-param)
media-range = ( "*/*"
/ ( m-type SLASH "*" )
/ ( m-type SLASH m-subtype )
) *( SEMI m-parameter )
NOW:
BEFORE:
Accept = "Accept" HCOLON [ accept-range *(COMMA accept-range) ]
accept-range = media-range *(SEMI accept-param)
media-range = ( "*/*"
/ ( m-type SLASH "*" )
/ ( m-type SLASH m-subtype )
)
I've removed '*( SEMI m-parameter )' since it duplicates '*(SEMI
accept-param)' so makes no sense.
I hope it is the correct approach.
Regards.
--
Iñaki Baz Castillo
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