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Metalink/HTTP: Mirrors and Hashes
RFC 6249

Internet Engineering Task Force (IETF)                          A. Bryan
Request for Comments: 6249                                      N. McNab
Category: Standards Track                                   T. Tsujikawa
ISSN: 2070-1721
                                                                P. Poeml
                                                             MirrorBrain
                                                            H. Nordstrom
                                                               June 2011

                   Metalink/HTTP: Mirrors and Hashes

Abstract

   This document specifies Metalink/HTTP: Mirrors and Cryptographic
   Hashes in HTTP header fields, a different way to get information that
   is usually contained in the Metalink XML-based download description
   format.  Metalink/HTTP describes multiple download locations
   (mirrors), Peer-to-Peer, cryptographic hashes, digital signatures,
   and other information using existing standards for HTTP header
   fields.  Metalink clients can use this information to make file
   transfers more robust and reliable.  Normative requirements for
   Metalink/HTTP clients and servers are described here.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6249.

Bryan, et al.                Standards Track                    [Page 1]
RFC 6249            Metalink/HTTP: Mirrors and Hashes          June 2011

Copyright Notice

   Copyright (c) 2011 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
   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
      1.1. Example Metalink Server Response ...........................4
      1.2. Notational Conventions .....................................4
      1.3. Terminology ................................................5
   2. Requirements ....................................................5
   3. Mirrors / Multiple Download Locations ...........................7
      3.1. Mirror Priority ............................................8
      3.2. Mirror Geographical Location ...............................8
      3.3. Coordinated Mirror Policies ................................8
      3.4. Mirror Depth ...............................................9
   4. Peer-to-Peer / Metainfo .........................................9
      4.1. Metalink/XML Files ........................................10
   5. Signatures .....................................................10
      5.1. OpenPGP Signatures ........................................10
      5.2. S/MIME Signatures .........................................10
   6. Cryptographic Hashes of Whole Documents ........................11
   7. Client / Server Multi-Source Download Interaction ..............11
      7.1. Error Prevention, Detection, and Correction ...............15
           7.1.1. Error Prevention (Early File Mismatch Detection) ...15
           7.1.2. Error Correction ...................................16
   8. IANA Considerations ............................................16
   9. Security Considerations ........................................17
      9.1. URIs and IRIs .............................................17
      9.2. Spoofing ..................................................17
      9.3. Cryptographic Hashes ......................................17
      9.4. Signing ...................................................17
   10. References ....................................................18
      10.1. Normative References .....................................18
      10.2. Informative References ...................................19
   Appendix A. Acknowledgements and Contributors .....................20

Bryan, et al.                Standards Track                    [Page 2]

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