HTTP framework for time-based access to resource states -- Memento
draft-vandesompel-memento-04

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Internet Engineering Task Force                           H. VandeSompel
Internet-Draft                            Los Alamos National Laboratory
Intended status: Informational                                 M. Nelson
Expires: November 25, 2012                       Old Dominion University
                                                            R. Sanderson
                                          Los Alamos National Laboratory
                                                            May 24, 2012

   HTTP framework for time-based access to resource states -- Memento
                      draft-vandesompel-memento-04

Abstract

   The HTTP-based Memento framework bridges the present and past Web by
   interlinking current resources with resources that encapsulate their
   past.  It facilitates obtaining representations of prior states of a
   resource, available from archival resources in Web archives or
   version resources in content management systems, by leveraging the
   resource's URI and a preferred datetime.  To this end, the framework
   introduces datetime negotiation (a variation on content negotiation),
   and new Relation Types for the HTTP "Link" header aimed at
   interlinking resources with their archival/version resources.  It
   also introduces various discovery mechanisms that further support
   bridging the present and past Web.

Status of this Memo

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   This Internet-Draft will expire on November 25, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

VandeSompel, et al.     Expires November 25, 2012               [Page 1]
Internet-Draft                HTTP Memento                      May 2012

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  4
     1.2.  Purpose  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.3.  Notational Conventions . . . . . . . . . . . . . . . . . .  6
   2.  The Memento Framework, Datetime Negotiation component:
       HTTP headers, HTTP Link Relation Types . . . . . . . . . . . .  7
     2.1.  HTTP Headers . . . . . . . . . . . . . . . . . . . . . . .  7
       2.1.1.  Accept-Datetime, Memento-Datetime  . . . . . . . . . .  7
         2.1.1.1.  Values for Accept-Datetime . . . . . . . . . . . .  8
         2.1.1.2.  Values for Memento-Datetime  . . . . . . . . . . .  9
       2.1.2.  Vary . . . . . . . . . . . . . . . . . . . . . . . . .  9
       2.1.3.  Location . . . . . . . . . . . . . . . . . . . . . . .  9
       2.1.4.  Link . . . . . . . . . . . . . . . . . . . . . . . . .  9
     2.2.  Link Header Relation Types . . . . . . . . . . . . . . . .  9
       2.2.1.  Memento Framework Relation Types . . . . . . . . . . . 10
         2.2.1.1.  Relation Type "original" . . . . . . . . . . . . . 10
         2.2.1.2.  Relation Type "timegate" . . . . . . . . . . . . . 11
         2.2.1.3.  Relation Type "timemap"  . . . . . . . . . . . . . 11
         2.2.1.4.  Relation Type "memento"  . . . . . . . . . . . . . 12
       2.2.2.  Other Relation Types . . . . . . . . . . . . . . . . . 13
   3.  The Memento Framework, Datetime Negotiation component:
       HTTP Interactions  . . . . . . . . . . . . . . . . . . . . . . 14
     3.1.  Interactions with an Original Resource . . . . . . . . . . 16
       3.1.1.  Step 1: User Agent Requests an Original Resource . . . 16
       3.1.2.  Step 2: Server Responds to a Request for an
               Original Resource  . . . . . . . . . . . . . . . . . . 16
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