HTTP framework for time-based access to resource states -- Memento
draft-vandesompel-memento-08

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Internet Engineering Task Force                           H. VandeSompel
Internet-Draft                            Los Alamos National Laboratory
Intended status: Informational                                 M. Nelson
Expires: January 10, 2014                        Old Dominion University
                                                            R. Sanderson
                                          Los Alamos National Laboratory
                                                           July 09, 2013

   HTTP framework for time-based access to resource states -- Memento
                      draft-vandesompel-memento-08

Abstract

   The HTTP-based Memento framework bridges the present and past Web. It
   facilitates obtaining representations of prior states of a given
   resource by introducing datetime negotiation and TimeMaps.  Datetime
   negotiation is a variation on content negotiation that leverages the
   given resource's URI and a user agent's preferred datetime.  TimeMaps
   are lists that enumerate URIs of resources that encapsulate prior
   states of the given resource.  The framework also facilitates
   recognizing a resource that encapsulates a frozen prior state of
   another resource.

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   Copyright (c) 2013 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 January 10, 2014                [Page 1]
Internet-Draft                HTTP Memento                     July 2013

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Notational Conventions  . . . . . . . . . . . . . . . . .   4
     1.3.  Purpose . . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  HTTP headers, Link Relation Types . . . . . . . . . . . . . .   6
     2.1.  HTTP Headers  . . . . . . . . . . . . . . . . . . . . . .   6
       2.1.1.  Accept-Datetime, Memento-Datetime . . . . . . . . . .   6
       2.1.2.  Vary  . . . . . . . . . . . . . . . . . . . . . . . .   7
       2.1.3.  Link  . . . . . . . . . . . . . . . . . . . . . . . .   8
     2.2.  Link Relation Types . . . . . . . . . . . . . . . . . . .   8
       2.2.1.  Link Relation Type "original" . . . . . . . . . . . .   8
       2.2.2.  Link Relation Type "timegate" . . . . . . . . . . . .   8
       2.2.3.  Link Relation Type "timemap"  . . . . . . . . . . . .   9
       2.2.4.  Link Relation Type "memento"  . . . . . . . . . . . .   9
   3.  Overview of the Memento Framework . . . . . . . . . . . . . .  10
     3.1.  Datetime Negotiation  . . . . . . . . . . . . . . . . . .  10
     3.2.  TimeMaps  . . . . . . . . . . . . . . . . . . . . . . . .  13
   4.  Datetime Negotiation: HTTP Interactions . . . . . . . . . . .  14
     4.1.  Pattern 1 - The Original Resource acts as its own
           TimeGate  . . . . . . . . . . . . . . . . . . . . . . . .  15
       4.1.1.  Pattern 1.1 - URI-R=URI-G ; 302-style negotiation ;
               distinct URI-M for Mementos . . . . . . . . . . . . .  15
       4.1.2.  Pattern 1.2 - URI-R=URI-G ; 200-style negotiation ;
               distinct URI-M for Mementos . . . . . . . . . . . . .  17
       4.1.3.  Pattern 1.3 - URI-R=URI-G ; 200-style negotiation ;
               no distinct URI-M for Mementos  . . . . . . . . . . .  18
     4.2.  Pattern 2 - A remote resource acts as a TimeGate for the
           Original Resource . . . . . . . . . . . . . . . . . . . .  19
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