Indicating Character Encoding and Language for HTTP Header Field Parameters
draft-reschke-rfc5987bis-05

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Last updated 2012-06-20
Replaced by rfc8187, draft-ietf-httpbis-rfc5987bis
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Network Working Group                                         J. Reschke
Internet-Draft                                                greenbytes
Obsoletes: 5987 (if approved)                              June 20, 2012
Intended status: Standards Track
Expires: December 22, 2012

    Indicating Character Encoding and Language for HTTP Header Field
                               Parameters
                      draft-reschke-rfc5987bis-05

Abstract

   By default, message header field parameters in Hypertext Transfer
   Protocol (HTTP) messages cannot carry characters outside the ISO-
   8859-1 character set.  RFC 2231 defines an encoding mechanism for use
   in Multipurpose Internet Mail Extensions (MIME) headers.  This
   document specifies an encoding suitable for use in HTTP header fields
   that is compatible with a profile of the encoding defined in RFC
   2231.

Editorial Note (To be removed by RFC Editor before publication)

   Distribution of this document is unlimited.  Although this is not a
   work item of the HTTPbis Working Group, comments should be sent to
   the Hypertext Transfer Protocol (HTTP) mailing list at
   ietf-http-wg@w3.org [1], which may be joined by sending a message
   with subject "subscribe" to ietf-http-wg-request@w3.org [2].

   Discussions of the HTTPbis Working Group are archived at
   <http://lists.w3.org/Archives/Public/ietf-http-wg/>.

   XML versions, latest edits, diffs, and the issues list for this
   document are available from
   <http://greenbytes.de/tech/webdav/#draft-reschke-rfc5987bis>.  A
   collection of test cases is available at
   <http://greenbytes.de/tech/tc2231/>.

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
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Reschke                 Expires December 22, 2012               [Page 1]
Internet-Draft      Charset/Language Encoding in HTTP          June 2012

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on December 22, 2012.

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   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Reschke                 Expires December 22, 2012               [Page 2]
Internet-Draft      Charset/Language Encoding in HTTP          June 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Notational Conventions . . . . . . . . . . . . . . . . . . . .  4
   3.  Comparison to RFC 2231 and Definition of the Encoding  . . . .  4
     3.1.  Parameter Continuations  . . . . . . . . . . . . . . . . .  5
     3.2.  Parameter Value Character Encoding and Language
           Information  . . . . . . . . . . . . . . . . . . . . . . .  5
       3.2.1.  Definition . . . . . . . . . . . . . . . . . . . . . .  5
       3.2.2.  Historical Notes . . . . . . . . . . . . . . . . . . .  7
       3.2.3.  Examples . . . . . . . . . . . . . . . . . . . . . . .  8
     3.3.  Language Specification in Encoded Words  . . . . . . . . .  8
   4.  Guidelines for Usage in HTTP Header Field Definitions  . . . .  9
     4.1.  When to Use the Extension  . . . . . . . . . . . . . . . .  9
     4.2.  Error Handling . . . . . . . . . . . . . . . . . . . . . .  9
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 10
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 10
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 11
   Appendix A.  Changes from RFC 5987 . . . . . . . . . . . . . . . . 12
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