Headers folding

Hi,

As you are speaking about headers and compliance of USEFOR with
RFC 3977 and RFC 5322, I wonder what happens to folding.

In RFC 3977, we have:


9.7.  Articles

     header = header-name ":" [CRLF] SP header-content CRLF
     header-content = *(S-CHAR / [CRLF] WS)
     S-CHAR   = %x21-FF
     WS = 1*(SP / TAB)
     SP  = %x20
     TAB = %x09

A.1.  Header Folding

   NNTP allows a header line to be folded (by inserting a CRLF pair)
   before any space or TAB character.

   Both email and Netnews articles are required to have at least one
   octet other than space or TAB on each header line.  Thus, folding can
   only happen at one point in each sequence of consecutive spaces or
   TABs.  Netnews articles are further required to have the header name,
   colon, and following space all on the first line; folding may only
   happen beyond that space.  Finally, some non-conforming software will
   remove trailing spaces and TABs from a line.  Therefore, it might be
   inadvisable to fold a header after a space or TAB.

   For maximum safety, header lines SHOULD conform to the following
   syntax rather than to that in Section 9.7.


     header = header-name ":" SP [header-content] CRLF
     header-content = [WS] token *( [CRLF] WS token )

     token     = 1*P-CHAR
     P-CHAR    = A-CHAR / UTF8-non-ascii
     A-CHAR    = %x21-7E
     UTF8-non-ascii = UTF8-2 / UTF8-3 / UTF8-4
     UTF8-2    = %xC2-DF UTF8-tail
     UTF8-3    = %xE0 %xA0-BF UTF8-tail / %xE1-EC 2UTF8-tail /
                 %xED %x80-9F UTF8-tail / %xEE-EF 2UTF8-tail
     UTF8-4    = %xF0 %x90-BF 2UTF8-tail / %xF1-F3 3UTF8-tail /
                 %xF4 %x80-8F 2UTF8-tail
     UTF8-tail = %x80-BF




Well, my question is for 9.7:

    header = header-name ":" [CRLF] SP header-content CRLF

Is it a valid header for USEFOR?  and for RFC 5322?


In A.1, it looks strange to have written the syntax this way:

     header-content = [WS] token *( [CRLF] WS token )

Hopefully it works!  (token does not contain WS but it comes
afterwards with "WS token"!)

-- 
Julien ÉLIE

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