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Re: Linear whitespace

From: Marc Schneider <mschneider@opnet.com>
Date: Wed, 04 May 2005 13:13:55 -0400
Message-Id: <6.1.0.6.2.20050504131051.027acf88@mailserver.opnet.com>
To: ietf-http-wg@w3.org
For example, would the following be valid?

GET<SP>/<SP>HTTP/1.1<CR><LF>Host<CR><LF><SP>:<CR><LF><SP>blah...

Thanks,
Marc

At 01:01 PM 5/4/2005, Marc Schneider wrote:
>Looking further in the RFC, I see that extra <CR> and <LF> characters are 
>explicitly prohibited from the request line in section 5.1. So ignore the 
>example.
>
>At 12:50 PM 5/4/2005, Marc Schneider wrote:
>>At the end of section 2.1 of RFC 2616 there is a rule about implied 
>>linear whitespace
>>
>>implied *LWS
>>The grammar described by this specification is word-based. Except where 
>>noted otherwise, linear white space (LWS) can be included between any two 
>>adjacent words (token or quoted-string), and between adjacent words and 
>>separators, without changing the interpretation of a field. At least one 
>>delimiter (LWS and/or separators) MUST exist between any two tokens (for 
>>the definition of "token" below), since they would otherwise be 
>>interpreted as a single token.
>>And in section 2.2 a definition of LWS is given
>>
>>HTTP/1.1 header field values can be folded onto multiple lines if the 
>>continuation line begins with a space or horizontal tab. All linear white 
>>space, including folding, has the same semantics as SP. A recipient MAY 
>>replace any linear white space with a single SP before interpreting the 
>>field value or forwarding the message downstream.
>>
>>
>>
>>LWS            =
>>[CRLF] 1*( SP | HT )
>>
>>Does the optional carriage return linefeed at the beginning of the LWS 
>>only apply to headers? Or can this CRLF appear between any two words or 
>>between a word an separator?
>>
>>For example, is the following valid?
>>
>>GET<CR><LF><SP>/<CR><LF><SP>HTTP/1.1<CR><LF>host:<SP>blah...
>>Thanks.
>>
>>Marc Schneider
>>Senior Software Engineer
>>
>>OPNET Technologies, Inc. (NASDAQ: OPNT)
>>tel: +1.240.497.3000
>>fax: +1.240.497.3001
>><http://www.opnet.com/>http://www.opnet.com
>>
>>====================================================
>>Register for OPNET's Online Technology Workshops
>><http://www.opnet.com/TechWorkshops/>http://www.opnet.com/TechWorkshops/
>>====================================================
>>Register for OPNETWORK 2005 (August 22-26, Washington DC)
>><http://www.opnet.com/opnetwork2005/>http://www.opnet.com/opnetwork2005/
>>====================================================
>
>Marc Schneider
>Senior Software Engineer
>
>OPNET Technologies, Inc. (NASDAQ: OPNT)
>tel: +1.240.497.3000
>fax: +1.240.497.3001
><http://www.opnet.com/>http://www.opnet.com
>
>====================================================
>Register for OPNET's Online Technology Workshops
><http://www.opnet.com/TechWorkshops/>http://www.opnet.com/TechWorkshops/
>====================================================
>Register for OPNETWORK 2005 (August 22-26, Washington DC)
><http://www.opnet.com/opnetwork2005/>http://www.opnet.com/opnetwork2005/
>====================================================

Marc Schneider
Senior Software Engineer

OPNET Technologies, Inc. (NASDAQ: OPNT)
tel: +1.240.497.3000
fax: +1.240.497.3001
<http://www.opnet.com/>http://www.opnet.com

====================================================
Register for OPNET's Online Technology Workshops
<http://www.opnet.com/TechWorkshops/>http://www.opnet.com/TechWorkshops/
====================================================
Register for OPNETWORK 2005 (August 22-26, Washington DC)
<http://www.opnet.com/opnetwork2005/>http://www.opnet.com/opnetwork2005/
====================================================
Received on Wednesday, 4 May 2005 17:14:08 GMT

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