RFC 3040 (rfc3040) - Page 1 of 32

Internet Web Replication and Caching Taxonomy

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Network Working Group                                          I. Cooper
Request for Comments: 3040                                 Equinix, Inc.
Category: Informational                                         I. Melve
                                                                 UNINETT
                                                            G. Tomlinson
                                                          CacheFlow Inc.
                                                            January 2001


             Internet Web Replication and Caching Taxonomy

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2001).  All Rights Reserved.

Abstract

   This memo specifies standard terminology and the taxonomy of web
   replication and caching infrastructure as deployed today.  It
   introduces standard concepts, and protocols used today within this
   application domain.  Currently deployed solutions employing these
   technologies are presented to establish a standard taxonomy.  Known
   problems with caching proxies are covered in the document titled
   "Known HTTP Proxy/Caching Problems", and are not part of this
   document.  This document presents open protocols and points to
   published material for each protocol.

Table of Contents

   1.      Introduction . . . . . . . . . . . . . . . . . . . . . . .  3
   2.      Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   2.1     Base Terms . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.2     First order derivative terms . . . . . . . . . . . . . . .  6
   2.3     Second order derivatives . . . . . . . . . . . . . . . . .  7
   2.4     Topological terms  . . . . . . . . . . . . . . . . . . . .  7
   2.5     Automatic use of proxies . . . . . . . . . . . . . . . . .  8
   3.      Distributed System Relationships . . . . . . . . . . . . .  9
   3.1     Replication Relationships  . . . . . . . . . . . . . . . .  9
   3.1.1   Client to Replica  . . . . . . . . . . . . . . . . . . . .  9
   3.1.2   Inter-Replica  . . . . . . . . . . . . . . . . . . . . . .  9
   3.2     Proxy Relationships  . . . . . . . . . . . . . . . . . . . 10
   3.2.1   Client to Non-Interception Proxy . . . . . . . . . . . . . 10



Cooper, et al.               Informational
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