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Re: draft-ietf-httpbis-header-structure-15.txt, 4.1.6. Serializing a String

Mark Nottingham <mnot@mnot.net> Tue, 18 February 2020 04:56 UTC

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From: Mark Nottingham <mnot@mnot.net>
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Date: Tue, 18 Feb 2020 15:53:00 +1100
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To: Kari Hurtta <hurtta-ietf@elmme-mailer.org>
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Subject: Re: draft-ietf-httpbis-header-structure-15.txt, 4.1.6. Serializing a String
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Hi Kari,

> On 17 Feb 2020, at 4:38 am, Kari Hurtta <hurtta-ietf@elmme-mailer.org> wrote:
> 
> 4.1.6.  Serializing a String
> https://tools.ietf.org/html/draft-ietf-httpbis-header-structure-15#section-4.1.6
> 	
> 
> Output is restricted ASCII, but this alogrithm seems not say that
> input_string is limited to ASCII
> 
> |   Given a string as input_string, return an ASCII string suitable for
> |   use in a HTTP header value.
> |
> |   1.  If input_string is not a sequence of characters, or contains
> |       characters in the range %x00-1f or %x7f (i.e., is not in VCHAR or
> |       SP), fail serialisation.
> 
> In other words, should this fail serialization if input_string is not
> ASCII string ?

That's one of the effects of this step, yes. See the definition of the string data type at:
  https://httpwg.org/http-extensions/draft-ietf-httpbis-header-structure.html#string


> Now failing is implicit, because there is just
> 
> |       2.  Append char to output.
> 
> And if char is not ASCII then "return an ASCII string" part
> is violated.
> 
> / Kari Hurtta
> 

--
Mark Nottingham   https://www.mnot.net/

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