HTTP Adaptation with Open Pluggable Edge Services (OPES)
RFC 4236

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Network Working Group                                        A. Rousskov
Request for Comments: 4236                       The Measurement Factory
Category: Standards Track                                     M. Stecher
                                                  CyberGuard Corporation
                                                           November 2005

        HTTP Adaptation with Open Pluggable Edge Services (OPES)

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   Open Pluggable Edge Services (OPES) framework documents several
   application-agnostic mechanisms such as OPES tracing, OPES bypass,
   and OPES callout protocol.  This document extends those generic
   mechanisms for Hypertext Transfer Protocol (HTTP) adaptation.
   Together, application-agnostic OPES documents and this HTTP profile
   constitute a complete specification for HTTP adaptation with OPES.

Rousskov & Stecher          Standards Track                     [Page 1]
RFC 4236               HTTP Adaptation with OPES           November 2005

Table of Contents

   1. Scope ...........................................................3
   2. OPES Document Map ...............................................3
   3. Callout Protocol ................................................4
      3.1. Application Message Parts ..................................5
      3.2. Application Profile Features ...............................6
           3.2.1. Profile Parts .......................................6
           3.2.2. Profile Structure ...................................8
           3.2.3. Aux-Parts ...........................................8
           3.2.4. Pause-At-Body .......................................9
           3.2.5. Stop-Receiving-Body ................................10
           3.2.6. Preservation-Interest-Body .........................10
           3.2.7. Content-Encodings ..................................11
           3.2.8. Profile Negotiation Example ........................12
      3.3. Application Message Start Message .........................13
      3.4. DUM Message ...............................................13
      3.5. Selective Adaptation ......................................14
      3.6. Hop-by-hop Headers ........................................15
      3.7. Transfer Encodings ........................................15
      3.8. HTTP Header Correctness ...................................16
           3.8.1. Message Size Recalculation .........................16
           3.8.2. Content-MD5 Header .................................17
      3.9. Examples ..................................................18
   4. Tracing ........................................................22
   5. Bypass .........................................................24
   6. IAB Considerations .............................................24
   7. Security Considerations ........................................24
   8. IANA Considerations ............................................24
   9. Compliance .....................................................25
   10. References ....................................................25
      10.1. Normative References .....................................25
      10.2. Informative References ...................................25

Rousskov & Stecher          Standards Track                     [Page 2]
RFC 4236               HTTP Adaptation with OPES           November 2005

1.  Scope

   The Open Pluggable Edge Services (OPES) framework documents several
   application-agnostic mechanisms such as OPES processor and endpoints
   communications [RFC3897] or OPES callout protocol [RFC4037].  This
   document extends those generic mechanisms for adaptation of a
   specific application protocol, HTTP [RFC2616].  Together,
   application-agnostic OPES documents and this HTTP profile constitute
   a complete specification for HTTP adaptation with OPES.

   The primary sections of this document specify HTTP-specific
   extensions for the corresponding application-agnostic mechanisms
   documented elsewhere.

2.  OPES Document Map

   This document belongs to a large set of OPES specifications produced
   by the IETF OPES Working Group.  Familiarity with the overall OPES
   approach and typical scenarios is often essential when trying to
   comprehend isolated OPES documents.  This section provides an index
   of OPES documents to assist the reader with finding "missing"
   information.

   o  The document on "OPES Use Cases and Deployment Scenarios"