RE: I-D Submission: draft-lee-httpext-metadata-00.txt

Thanks for your comment, Michael.
In addition to your comments, it would greatly help web servers reduce
their maintenance cost for service infrastructure. It may reduce network
traffic to back-end servers, require less storage since it does not store
meta-data in another separate document, and simplify publishing and
maintaining of web resource. It relies on web resource itself for meta-
data, and dynamically extracts meta-data on demand. There is the
possibility that CPU load of web server would increase to process such meta-
data extraction, but memory cache could compensate the load.

Semantically, it's similar to range-unit and content-range header in HTTP/1.
1, which allows client to request that only a range of the response entity
be included within the response. In case of this proposal, request-meta
header allows client to request that only a meta-data of the target
resource be included within the response. 

I think the property (or meta-data) of an object (or web resource) is a
part of the object (or web resource). For example, an apple is laid down in
a showcase and I'd like to decide whether I'll buy it. I don't need to grab
the apple directly if I could know its color, smell, sweetness, and
freshness. Pick-out to grab and push-back to the showcase is more
inconvenient. An equipment which monitors the property of the apple can
tell me about the apple if I push a button, and I'm proposing such button
pushing protocol to operate web server to respond with resource meta-data.

Moon-Sang Lee

Moon-Sang Lee, Senior Engineer, Ph.D.
Convergence Software Lab., Digital Media & Communication R&D Center,
Samsung Electronics Co., Ltd.,
TEL: +82-31-279-8082
Wisdom begins in wonder. *Socrates*

-----Original Message-----
From: Hausenblas, Michael [] 
Sent: Saturday, June 26, 2010 6:12 PM
To: Eran Hammer-Lahav
Cc: 이문상;
Subject: Re: I-D Submission: draft-lee-httpext-metadata-00.txt

+1 to what Eran said, I couldn't have phrased it better.

Nevertheless, your use case sounds interesting, Moon-Sang, and I'd be more
than happy to follow-up off-list to investigate how it can be realised with
existing methods, such as Link: header.

Sent from my iPhone

On 26 Jun 2010, at 08:57, "Eran Hammer-Lahav" <>

> Hi,
> You are entering an area with a lot of prior experience.
> There is little reason to extend HTTP with additional headers given 
> the recent work on the HTTP Link header [1] (and the 'describedby'
> relation type), as well as the POWDER [2] and XRD [3] descriptor 
> formats, and the host-meta proposal [4] which is currently in last 
> call. In addition, you might want to take a look at analysis included 
> in an early draft of LRDD [5] which covers existing methods for 
> obtaining resource metadata.
> Between using the HTTP Link header and host-meta, you should have full 
> coverage of what you are trying to do, without having to create any 
> new mechanism.
> [1]
> [2]
> [3] 
> d-1.0-wd17.html [4]
> [5]
>> -----Original Message-----
>> From: [mailto:ietf-http-wg- 
>>] On Behalf Of ???
>> Sent: Friday, June 25, 2010 7:48 PM
>> To:
>> Subject: FW: I-D Submission: draft-lee-httpext-metadata-00.txt
>> FYI.
>> ---
>> Moon-Sang Lee, Senior Engineer, Ph.D.
>> Convergence Software Lab., Digital Media & Communication R&D Center,
>> Samsung Electronics Co., Ltd.,
>> TEL: +82-31-279-8082
>> Email:
>> Wisdom begins in wonder. *Socrates*
>> -----Original Message-----
>> From: IETF I-D Submission Tool []
>> Sent: Friday, June 25, 2010 4:34 PM
>> To:
>> Cc:;
>> Subject:
>> Message-Id: <>
>> Date: Fri, 25 Jun 2010 00:33:55 -0700 (PDT)
>> ,
>> Subject: Manual Post Requested for draft-lee-httpext-metadata
>> Content-Type: text/plain; charset="utf-8"
>> Mime-Version: 1.0
>> Manual Posting Requested for following Internet-Draft:
>> I-D Submission Tool URL:
>> Filename:       draft-lee-httpext-metadata
>> Version:       00
>> Staging URL:
>> 00.txt
>> Title:           A New Header For Metadata Exchange
>> Creation_date:       2010-06-25
>> WG ID:           Individual Submission
>> Number_of_pages: 11
>> Abstract:
>> This document provides a mechanism by which web servers can provide
>> metadata of a web resource which is indicated by a URL.  The web  
>> client like
>> web browser can use this metadata to filter out unwanted web  
>> resource or
>> link to itself.  In addition, the web client can take advantage of  
>> such metadata
>> to provide high-level services like displaying additional  
>> information about the
>> web resource without downloading it.  We expect this mechanism to  
>> enable
>> quick access to metadata of any web resource from any web client  
>> reduces
>> overall web traffic remarkably.
>> Submitter: Moon-Sang Lee (
>> Author(s):
>> Moon-Sang Lee,
>> Jung-Lok Yu,
>> Comment:
>> Thank you!

Received on Sunday, 4 July 2010 05:37:30 UTC