HTTP framework for time-based access to resource states -- Memento
draft-vandesompel-memento-06

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Internet Engineering Task Force                           H. VandeSompel
Internet-Draft                            Los Alamos National Laboratory
Intended status: Informational                                 M. Nelson
Expires: August 29, 2013                         Old Dominion University
                                                            R. Sanderson
                                          Los Alamos National Laboratory
                                                       February 25, 2013

   HTTP framework for time-based access to resource states -- Memento
                      draft-vandesompel-memento-06

Abstract

   The HTTP-based Memento framework bridges the present and past Web. It
   facilitates obtaining representations of prior states of a resource
   by leveraging the resource's URI and a preferred datetime.  To this
   end, the framework introduces datetime negotiation, a variation on
   content negotiation.  It also facilitates recongizing a resource that
   encapsulates a frozen prior state of another resource by expressing
   that state's datetime and by providing an appropriately typed link to
   that other 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
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   (http://trustee.ietf.org/license-info) in effect on the date of

VandeSompel, et al.      Expires August 29, 2013                [Page 1]
Internet-Draft                HTTP Memento                 February 2013

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  4
     1.2.  Notational Conventions . . . . . . . . . . . . . . . . . .  4
     1.3.  Purpose  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  HTTP headers, Relation Types . . . . . . . . . . . . . . . . .  6
     2.1.  HTTP Headers . . . . . . . . . . . . . . . . . . . . . . .  7
       2.1.1.  Accept-Datetime, Memento-Datetime  . . . . . . . . . .  7
       2.1.2.  Vary . . . . . . . . . . . . . . . . . . . . . . . . .  8
       2.1.3.  Link . . . . . . . . . . . . . . . . . . . . . . . . .  8
     2.2.  Relation Types . . . . . . . . . . . . . . . . . . . . . .  8
       2.2.1.  Relation Type "original" . . . . . . . . . . . . . . .  9
       2.2.2.  Relation Type "timegate" . . . . . . . . . . . . . . .  9
       2.2.3.  Relation Type "timemap"  . . . . . . . . . . . . . . .  9
       2.2.4.  Relation Type "memento"  . . . . . . . . . . . . . . . 10
     2.3.  Memento response headers: Summary  . . . . . . . . . . . . 10
   3.  General considerations regarding Datetime Negotiation  . . . . 11
   4.  HTTP Interactions for Datetime Negotiation . . . . . . . . . . 12
     4.1.  Pattern 1 - The Original Resource acts as its own
           TimeGate . . . . . . . . . . . . . . . . . . . . . . . . . 14
       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
       4.2.1.  Pattern 2.1 - URI-R<>URI-G ; 302-style negotiation
               ; distinct URI-M for Mementos  . . . . . . . . . . . . 21
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