Forwarded HTTP Extension
draft-ietf-appsawg-http-forwarded-00

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Document Type Active Internet-Draft (appsawg WG)
Last updated 2012-03-23 (latest revision 2012-01-27)
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Send notices to appsawg-chairs@tools.ietf.org, draft-ietf-appsawg-http-forwarded@tools.ietf.org
Network Working Group                                       A. Petersson
Internet-Draft                                                M. Nilsson
Intended status: Standards Track                          Opera Software
Expires: July 30, 2012                                  January 27, 2012

                        Forwarded HTTP Extension
                  draft-ietf-appsawg-http-forwarded-00

Abstract

   This document standardizes an HTTP extension header field that allows
   proxy components to disclose information lost in the proxying
   process, e.g. the originating IP number of a request or IP number of
   the proxy on the incoming side.  Given a trusted path of proxying
   components, each subsequent component will have access to all IP
   numbers used in the chain of proxied HTTP requests.

   This document also standardizes ways for a proxy administrator to
   anonymize the origin of a request.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on July 30, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

Petersson & Nilsson       Expires July 30, 2012                 [Page 1]
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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Notational Conventions . . . . . . . . . . . . . . . . . . . .  3
   3.  Syntax Notations . . . . . . . . . . . . . . . . . . . . . . .  3
   4.  Forwarded  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   5.  Parameters . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     5.1.  Forwarded by . . . . . . . . . . . . . . . . . . . . . . .  5
     5.2.  Forwarded for  . . . . . . . . . . . . . . . . . . . . . .  6
     5.3.  Forwarded host . . . . . . . . . . . . . . . . . . . . . .  6
     5.4.  Forwarded proto  . . . . . . . . . . . . . . . . . . . . .  6
     5.5.  Private extensions . . . . . . . . . . . . . . . . . . . .  6
     5.6.  Future extensions  . . . . . . . . . . . . . . . . . . . .  6
   6.  Node identifiers . . . . . . . . . . . . . . . . . . . . . . .  6
     6.1.  IPv4 and IPv6 identifiers  . . . . . . . . . . . . . . . .  7
     6.2.  The "unknown" identifier . . . . . . . . . . . . . . . . .  7
     6.3.  Obfuscated identifier  . . . . . . . . . . . . . . . . . .  8
   7.  Implementation considerations  . . . . . . . . . . . . . . . .  8
   8.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
     8.1.  Header validity  . . . . . . . . . . . . . . . . . . . . .  8
     8.2.  Information Leak . . . . . . . . . . . . . . . . . . . . .  9
   9.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   10. References . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     10.1. Normative references . . . . . . . . . . . . . . . . . . .  9
     10.2. Informative references . . . . . . . . . . . . . . . . . . 10
   Appendix A.  Forwarded BNF definition  . . . . . . . . . . . . . . 10
   Appendix B.  Change Log (to be removed by  RFC Editor before
                publication)  . . . . . . . . . . . . . . . . . . . . 11
     B.1.  Since draft-petersson-forwarded-for-00 . . . . . . . . . . 11
     B.2.  Since draft-petersson-forwarded-for-01 . . . . . . . . . . 11
     B.3.  Since draft-petersson-forwarded-for-02 . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12

Petersson & Nilsson       Expires July 30, 2012                 [Page 2]
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1.  Introduction

   In today's HTTP landscape, there are a multitude of different
   applications acting as a proxy for the user agent and effectively
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