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Re: New PEP draft available as ID!

From: Henrik Frystyk Nielsen <frystyk@w3.org>
Date: Thu, 01 May 1997 12:42:21 -0400
Message-Id: <>
To: Hallam-Baker <hallam@ai.mit.edu>, Yaron Goland <yarong@microsoft.com>
Cc: http-wg@cuckoo.hpl.hp.com
X-Mailing-List: <http-wg@cuckoo.hpl.hp.com> archive/latest/3195
At 06:46 PM 4/30/97 -0400, Hallam-Baker wrote:

>I believe that the problems with PEP could be solved by abandoning the
>idea of sending meta-protocol information along with the connection
>Instead of doing this I would like to see a single tag to define the
>semantics of any x-tended headers and how proxies should deal with them.
>The tag would be of the form :-
>PEP-Extension: <version> <url>

But Phill - this is exactly what the current draft says! Meta-information
and  transaction information isn't mixed and PEP is nothing more than a
binding between a new header field and it's semantics (see my previous mail
in reply to Yaron's mail)

>I understand that there are occasions in which this will not work such 
>as intranets not connected to the Internet and intergalactic spacecraft.
>I think that attempting to address these corner cases by sending a
>couple of hundred bytes of verbiage along with every message is a bit 
>broken and unlikely to fly in any case.

The current PEP draft actually handles these situations - which is the
reason why the draft is somewhat longer than it was last time. No need to
discriminate against anybody as long as they are still in URI space.

>PEP only specifies the grammar of the protocol, not the semantics. It
>can only solve the problem of proxies and other intermediaries that need
>to know something about the tags being passed.

PEP relies on normal HTTP/1.1 semantics that already describes how to deal
with proxies - caching and non-caching. PEP doesn't change this model not
does it have to.


Henrik Frystyk Nielsen, <frystyk@w3.org>
World Wide Web Consortium, MIT/LCS NE43-346
545 Technology Square, Cambridge MA 02139, USA
Received on Thursday, 1 May 1997 09:47:31 UTC

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