RFC 2392 (rfc2392) - Page 1 of 6

Content-ID and Message-ID Uniform Resource Locators

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Network Working Group                                        E. Levinson
Request for Comments: 2392                                   August 1998
Obsoletes: 2111
Category: Standards Track


          Content-ID and Message-ID Uniform Resource Locators

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 (1998).  All Rights Reserved.

Abstract

   The Uniform Resource Locator (URL) schemes, "cid:" and "mid:" allow
   references to messages and the body parts of messages.  For example,
   within a single multipart message, one HTML body part might include
   embedded references to other parts of the same message.

Changes from (RFC 2111)

   Clarified the example on page 3 on of converting cid URLs to
   Content-IDs.  The example now uses a cid URL instead of an mid.

   Corrected the example messages to have the correct Content-ID form;
   they now use the angle brackets.  Added a Message-ID header to the
   second example.

1. Introduction

   The use of [MIME] within email to convey Web pages and their
   associated images requires a URL scheme to permit the HTML to refer
   to the images or other data included in the message.  The Content-ID
   Uniform Resource Locator, "cid:", serves that purpose.

   Similarly Net News readers use Message-IDs to link related messages
   together.  The Message-ID URL provides a scheme, "mid:", to refer to
   such messages as a "resource".





Levinson                    Standards Track
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