The 'application/zlib' and 'application/gzip' Media Types
RFC 6713

 
Document Type RFC - Informational (August 2012; No errata)
Was draft-levine-application-gzip (individual in app area)
Last updated 2013-02-12
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IESG IESG state RFC 6713 (Informational)
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Internet Engineering Task Force (IETF)                         J. Levine
Request for Comments: 6713                          Taughannock Networks
Category: Informational                                      August 2012
ISSN: 2070-1721

       The 'application/zlib' and 'application/gzip' Media Types

Abstract

   This document defines the 'application/gzip' and 'application/zlib'
   media types for compressed data using the gzip and zlib compression
   formats.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6713.

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
   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.

Levine                        Informational                     [Page 1]
RFC 6713              Media Types 'zlib' and 'gzip'          August 2012

1.  Introduction

   zlib [RFC1950] and gzip [RFC1952] are widely used compression
   formats. zlib is a stream format, while gzip adds header and trailer
   fields more appropriate for a file format.  Both implement the
   DEFLATE compression scheme described in [RFC1951].

   They are used to compress a wide variety of material, from
   unstructured text to structured data to executable code.

   Some applications have informally used media types such as
   application/gzip-compressed, application/gzipped, application/
   x-gunzip, application/x-gzip, application/x-gzip-compressed, and
   gzip/document to describe data compressed with gzip.  The media types
   defined in this document should replace those media types in future
   applications.

2.  The 'application/zlib' Media Type

   The 'application/zlib' media type describes a block of data that is
   compressed using zlib [RFC1950] compression.  The data is a stream of
   bytes as described in RFC 1950.

2.1.  Registration Details

   Type name: application

   Subtype name: zlib

   Required parameters: N/A

   Optional parameters: N/A

   Encoding considerations: Binary

   Security considerations: See Section 4 below.

   Interoperability considerations: N/A

   Published specification: [RFC1950]

   Applications that use this media type: anywhere data size is an issue

   Additional information:
      Magic number(s): first byte is usually 0x78 but can also be 0x08,
      0x18, 0x28, 0x38, 0x48, 0x58, or 0x68.  The first two bytes, when
      interpreted as an unsigned 16-bit number in big-endian byte order,
      contain a value that is a multiple of 31.

Levine                        Informational                     [Page 2]
RFC 6713              Media Types 'zlib' and 'gzip'          August 2012

      File extension(s): N/A
      Macintosh file type code(s): N/A

   Person and email address to contact for further information: see
   http://www.zlib.net/

   Intended usage: COMMON

   Restrictions on usage: N/A

   Author: John Levine

   Change controller: IETF

3.  The 'application/gzip' Media Type

   The 'application/gzip' media type describes a block of data that is
   compressed using gzip [RFC1952] compression.  The data is a stream of
   bytes as described in RFC 1952.

3.1.  Registration Details

   Type name: application

   Subtype name: gzip

   Required parameters: N/A

   Optional parameters: N/A

   Encoding considerations: Binary

   Security considerations: See Section 4 below.

   Interoperability considerations: N/A

   Published specification: [RFC1952]

   Applications that use this media type: anywhere data size is an issue
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