WebFinger
draft-ietf-appsawg-webfinger-04

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Document Type Active Internet-Draft (appsawg WG)
Last updated 2012-11-21
Replaces draft-jones-appsawg-webfinger
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Network Working Group                                      Paul E. Jones
Internet Draft                                         Gonzalo Salgueiro
Intended status: Standards Track                           Cisco Systems
Expires: May 21, 2013                                       Joseph Smarr
                                                                  Google
                                                       November 21, 2012

                                 WebFinger
                    draft-ietf-appsawg-webfinger-04.txt

Abstract

   This specification defines the WebFinger protocol, which can be used
   to discover information about people or other entities on the
   Internet using standard HTTP methods.

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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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 21, 2013.

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
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   described in the Simplified BSD License.

Jones, et al.            Expires May 21, 2013                   [Page 1]
Internet-Draft                WebFinger                    November 2012

Table of Contents

   1. Introduction...................................................2
   2. Terminology....................................................3
   3. Overview.......................................................3
   4. Example Use of WebFinger.......................................3
      4.1. Locating a User's Blog....................................3
      4.2. Auto-Configuration of Email Clients.......................5
      4.3. Retrieving Device Information.............................7
   5. WebFinger Protocol.............................................8
      5.1. Performing a WebFinger Query..............................8
      5.2. The JSON Resource Descriptor (JRD) Document...............9
      5.3. The "rel" Parameter.......................................9
      5.4. WebFinger and URIs.......................................11
   6. Cross-Origin Resource Sharing (CORS)..........................12
   7. Controlling Access to Information.............................12
   8. Hosted WebFinger Services.....................................13
   9. Security Considerations.......................................14
   10. IANA Considerations..........................................15
   11. Acknowledgments..............................................16
   12. References...................................................16
      12.1. Normative References....................................16
      12.2. Informative References..................................16
   Author's Addresses...............................................17

1. Introduction

   There is a utility found on UNIX systems called "finger" [12] that
   allows a person to access information about another person or entity
   that has a UNIX account.  The information queried might be on the
   same computer or a computer anywhere in the world.  What is returned
   via "finger" is a plain text file that contains unstructured
   information provided by the queried user, stored in a file named
   .plan in the user's home directory.

   Like the finger command, WebFinger can be used to discover
   information about people or other entities on the Internet.  However,
   unlike the legacy finger command, WebFinger uses standard HTTP [2]
   methods and utilizes a structured document that contains link
   relations that are suitable for automated processes.  These link
   relations point to information and might return properties related to
   information a user or entity on the Internet wishes to share.  For a
   person, the kinds of information that might be shared include a
   personal profile address, identity service, telephone number, or
   preferred avatar.  WebFinger may also be used to discover information
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