RFC 2392 (rfc2392) - Page 1 of 6
Content-ID and Message-ID Uniform Resource Locators
Alternative Format: Original Text Document
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