Re: [apps-discuss] Fwd: I-D Action: draft-yevstifeyev-ftp-uri-scheme-04.txt

"Martin J. Dürst" <duerst@it.aoyama.ac.jp> Fri, 15 July 2011 04:03 UTC

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Date: Fri, 15 Jul 2011 13:02:10 +0900
From: =?ISO-8859-1?Q?=22Martin_J=2E_D=FCrst=22?= <duerst@it.aoyama.ac.jp>
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To: Mykyta Yevstifeyev <evnikita2@gmail.com>
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Subject: Re: [apps-discuss] Fwd: I-D Action: draft-yevstifeyev-ftp-uri-scheme-04.txt
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Hello Mykyta,

On 2011/07/15 12:44, Mykyta Yevstifeyev wrote:
> 15.07.2011 2:44, Frank Ellermann wrote:

>> That allows an unencoded '@' in the<path>, not the '@' you are
>> interested in while trying to skip any<userinfo>@.
>>
>> query = *( pchar / "/" / "?" )
>>
>> Ditto, unencoded '@' in the<query> (section 3.4, page 24).
>>
>> fragment = *( pchar / "/" / "?" )
>>
>> Ditto, unencoded '@' in the<fragment> (section 3.5, page 24).

> I see what you mean. I'll correct the expression as you proposed.
> However, I actually don't understand why "@" is either in <gen-delims>,
> which is in <reserved> and doesn't allow it to be present in queries and
> fragments, and in <pchar>, which is OK with this?

It has to do with the fact that some software components processing URIs 
and their componests have no scheme-specific knowledge, whereas others 
do. Please read the text after the
     reserved    = gen-delims / sub-delims
ABNF rule in RFC 3986.

Regards,    Martin.