Forwarded HTTP Extension
draft-ietf-appsawg-http-forwarded-01

The information below is for an old version of the document
Document Type Active Internet-Draft (appsawg WG)
Last updated 2012-03-30 (latest revision 2012-03-26)
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state WG Document
Document shepherd Alexey Melnikov
IESG IESG state AD is watching
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Responsible AD Barry Leiba
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: September 27, 2012                               March 26, 2012

                        Forwarded HTTP Extension
                  draft-ietf-appsawg-http-forwarded-01

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 address of a request or IP number
   of the proxy on the user-agent facing interface.  Given a trusted
   path of proxying components, this makes it possible to arrange so
   that each subsequent component will have access to e.g., all IP
   addresses used in the chain of proxied HTTP requests.

   This document also specifies guidelines 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
   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 27, 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

Petersson & Nilsson    Expires September 27, 2012               [Page 1]
Internet-Draft          Forwarded HTTP Extension              March 2012

   carefully, as they describe your rights and restrictions with respect
   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  . . . . . . . . . . . . . . . . . . . . . . . . . .  3
   5.  Parameters . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     5.1.  Forwarded by . . . . . . . . . . . . . . . . . . . . . . .  5
     5.2.  Forwarded for  . . . . . . . . . . . . . . . . . . . . . .  5
     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 and integrity  . . . . . . . . . . . . . .  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
     B.4.  Since draft-ietf-appsawg-http-forwarded-00 . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 12
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