HTTP framework for time-based access to resource states -- Memento
draft-vandesompel-memento-05

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Internet Engineering Task Force                           H. VandeSompel
Internet-Draft                            Los Alamos National Laboratory
Intended status: Informational                                 M. Nelson
Expires: May 20, 2013                            Old Dominion University
                                                            R. Sanderson
                                          Los Alamos National Laboratory
                                                       November 16, 2012

   HTTP framework for time-based access to resource states -- Memento
                      draft-vandesompel-memento-05

Abstract

   The HTTP-based Memento framework bridges the present and past Web by
   interlinking current resources with resources that encapsulate their
   past.  It facilitates accessing prior states of a resource,
   encapsulated in 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.  It also introduces discovery mechanisms to support
   these capabilities.

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   Copyright (c) 2012 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents

VandeSompel, et al.       Expires May 20, 2013                  [Page 1]
Internet-Draft                HTTP Memento                 November 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 . . . . . . . . . . . . . . . . . . . . . . . . . 10
     2.2.  Link Header Relation Types . . . . . . . . . . . . . . . . 10
       2.2.1.  Memento Framework Relation Types . . . . . . . . . . . 10
         2.2.1.1.  Relation Type "original" . . . . . . . . . . . . . 11
         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 . . . . . . . . . . 15
       3.1.1.  Step 1: User Agent Requests an Original Resource . . . 15
       3.1.2.  Step 2: Server Responds to a Request for an
               Original Resource  . . . . . . . . . . . . . . . . . . 15
         3.1.2.1.  Original Resource is an Appropriate Memento  . . . 16
         3.1.2.2.  Server Exists and Original Resource Used to
                   Exist  . . . . . . . . . . . . . . . . . . . . . . 17
         3.1.2.3.  Missing "timegate" Link in Original Server's
                   Response . . . . . . . . . . . . . . . . . . . . . 18
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