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Re: Comp.lang.php group question [message #170448 is a reply to message #170444]

Mon, 01 November 2010 16:57

Sherm Pendley
Messages: 33
Registered: September 2010

Karma:

Member

"Beauregard T. Shagnasty" <a(dot)nony(dot)mous(at)example(dot)invalid> writes:

> Sherm Pendley wrote:
>
>> "Beauregard T. Shagnasty" writes:
>>> Yup. YW. I learned it from a poster in n.s.r a couple years ago. I've
>>> forgotten whom. There'll be a list somewhere of which header fields
>>> are and are not included in 'header fetch' but it's too dark yet
>>> this morning to go googling...
>>
>> No need - I assume it's in the relevant RFCs, and I know where to
>> find those. :-)
>
> Here: http://tools.ietf.org/html/rfc1036

That defines the format of messages, not the NNTP protocol; for the
latter, the current RFC is 3977:

<http://tools.ietf.org/html/rfc3977>

> <quote>
> The required header lines are "From", "Date", "Newsgroups", "Subject",
> "Message-ID", and "Path".
>
> The optional header lines are "Followup-To", "Expires", "Reply-To",
> "Sender", "References", "Control", "Distribution", "Keywords",
> "Summary", "Approved", "Lines", "Xref", and "Organization".
> </quote>

That's a list of what headers are required to be in a message, not the
ones that must be returned by the NNTP OVER command. Section 8.3.2 of
RFC3977 lists the latter:

"0" or article number (see below)
Subject header content
From header content
Date header content
Message-ID header content
References header content
:bytes metadata item
:lines metadata item

Note that the above list is different from that given in 1036 - it
includes References, but not Newsgroups or Path. Even so, Organization
isn't in either list, so that difference is academic.

It gets more interesting though; filtering on a field that's not in the
above list *still* doesn't necessarily require fetching a full article.
If the server supports the optional HDR (Section 8.5) command, that
can be used to fetch a single header field for one or more articles. A
client that wants to use that can use the LIST HEADERS (Section 8.6)
command to see what headers can be fetched by the HDR command.

So, a sufficiently-intelligent client that's connected to a sufficiently-
advanced server could, upon finding a filter that uses a header that's
not returned by the OVER command, use a HDR command to fetch the
additional header fields it needs.

The question then becomes whether a given client is smart enough to
do so, and whether the server to which it's connected supports the
optional commands it would need to do so.

Nothing is *ever* as simple as it seems, is it? :-)

sherm--

--
Sherm Pendley
<http://camelbones.sourceforge.net>
Cocoa Developer

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[Message index]

		Comp.lang.php group question By: GarryJones on Thu, 28 October 2010 17:19
		Re: Comp.lang.php group question By: Chuck Anderson on Thu, 28 October 2010 18:43
		Re: Comp.lang.php group question By: Magno on Thu, 28 October 2010 18:58
		Re: Comp.lang.php group question By: matt[1] on Thu, 28 October 2010 19:13
		Re: Comp.lang.php group question By: Gilles Ganault on Thu, 28 October 2010 19:22
		Re: Comp.lang.php group question By: Magno on Thu, 28 October 2010 19:36
		Re: Comp.lang.php group question By: Jerry Stuckle on Thu, 28 October 2010 20:24
		Re: Comp.lang.php group question By: Magno on Thu, 28 October 2010 20:32
		Re: Comp.lang.php group question By: Jerry Stuckle on Thu, 28 October 2010 20:54
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Thu, 28 October 2010 20:50
		Re: Comp.lang.php group question By: Magno on Thu, 28 October 2010 21:26
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Thu, 28 October 2010 22:05
		Re: Comp.lang.php group question By: Magno on Thu, 28 October 2010 22:17
		Re: Comp.lang.php group question By: Jerry Stuckle on Fri, 29 October 2010 02:06
		Re: Comp.lang.php group question By: Tim Streater on Fri, 29 October 2010 08:56
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Fri, 29 October 2010 02:34
		Re: Comp.lang.php group question By: spambait on Fri, 29 October 2010 01:05
		Re: Comp.lang.php group question By: sheldonlg on Sat, 30 October 2010 12:52
		Re: Comp.lang.php group question By: Twayne on Sat, 30 October 2010 14:40
		Re: Comp.lang.php group question By: Peter H. Coffin on Sat, 30 October 2010 15:55
		Re: Comp.lang.php group question By: sheldonlg on Sun, 31 October 2010 16:03
		Re: Comp.lang.php group question By: Magno on Sun, 31 October 2010 16:09
		Re: Comp.lang.php group question By: sheldonlg on Sun, 31 October 2010 17:04
		Re: Comp.lang.php group question By: David Pyles on Sun, 31 October 2010 18:04
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Sun, 31 October 2010 18:35
		Re: Comp.lang.php group question By: me on Mon, 01 November 2010 10:51
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Mon, 01 November 2010 11:52
		Re: Comp.lang.php group question By: me on Mon, 01 November 2010 12:13
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Mon, 01 November 2010 12:54
		Re: Comp.lang.php group question By: sheldonlg on Mon, 01 November 2010 13:10
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Mon, 01 November 2010 14:00
		Re: Comp.lang.php group question By: me on Mon, 01 November 2010 14:30
		Re: Comp.lang.php group question By: me on Mon, 01 November 2010 14:31
		Re: Comp.lang.php group question By: Magno on Mon, 01 November 2010 15:30
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Sun, 31 October 2010 17:04
		Re: Comp.lang.php group question By: Sherm Pendley on Sun, 31 October 2010 17:10
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Sun, 31 October 2010 17:20
		Re: Comp.lang.php group question By: David Pyles on Sun, 31 October 2010 18:02
		Re: Comp.lang.php group question By: Magno on Sun, 31 October 2010 19:59
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Sun, 31 October 2010 20:11
		Re: Comp.lang.php group question By: Jerry Stuckle on Sun, 31 October 2010 20:23
		Re: Comp.lang.php group question By: Magno on Sun, 31 October 2010 20:26
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Sun, 31 October 2010 21:35
		Re: Comp.lang.php group question By: Magno on Sun, 31 October 2010 21:45
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Sun, 31 October 2010 22:44
		Re: Comp.lang.php group question By: Jerry Stuckle on Sun, 31 October 2010 23:05
		Re: Comp.lang.php group question By: Magno on Sun, 31 October 2010 23:48
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Mon, 01 November 2010 00:55
		Re: Comp.lang.php group question By: Sherm Pendley on Mon, 01 November 2010 04:33
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Mon, 01 November 2010 09:49
		Re: Comp.lang.php group question By: Sherm Pendley on Mon, 01 November 2010 15:38
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Mon, 01 November 2010 16:21
		Re: Comp.lang.php group question By: Sherm Pendley on Mon, 01 November 2010 16:57
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Mon, 01 November 2010 17:49
		Re: Comp.lang.php group question By: me on Mon, 01 November 2010 17:33
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Mon, 01 November 2010 17:50
		Re: Comp.lang.php group question By: sheldonlg on Mon, 01 November 2010 00:55
		Re: Comp.lang.php group question By: sheldonlg on Mon, 01 November 2010 22:25
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Tue, 02 November 2010 00:14
		Re: Comp.lang.php group question By: sheldonlg on Tue, 02 November 2010 02:14
		Re: Comp.lang.php group question By: sheldonlg on Tue, 02 November 2010 02:24
		Re: Comp.lang.php group question By: Jerry Stuckle on Tue, 02 November 2010 03:12
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Tue, 02 November 2010 03:19
		Re: Comp.lang.php group question By: sheldonlg on Tue, 02 November 2010 12:24
		Re: Comp.lang.php group question By: John Doe on Tue, 02 November 2010 13:30
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Tue, 02 November 2010 14:14
		Re: Comp.lang.php group question By: sheldonlg on Tue, 02 November 2010 14:15
		Re: Comp.lang.php group question By: Beauregard T. Shagnas on Tue, 02 November 2010 15:36
		Re: Comp.lang.php group question By: sheldonlg on Tue, 02 November 2010 13:59

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