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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
+
+   Additional information:
+      Magic number(s): first two bytes are 0x1f, 0x8b.
+      File extension(s): gz
+      Macintosh file type code(s): N/A
+
+   Person and email address to contact for further information: see
+   http://www.gzip.org/
+
+
+
+
+Levine                        Informational                     [Page 3]
+
+RFC 6713              Media Types 'zlib' and 'gzip'          August 2012
+
+
+   Intended usage: COMMON
+
+   Restrictions on usage: N/A
+
+   Author: John Levine
+
+   Change controller: IETF
+
+4.  Security Considerations
+
+   zlib and gzip compression can be used to compress arbitrary binary
+   data such as hostile executable code.  Also, data that purports to be
+   in zlib or gzip format may not be, and fields that are supposed to be
+   flags, lengths, or pointers could contain anything.  Applications
+   should treat any data with due skepticism.
+
+   Also see the security considerations in the underlying format
+   documents: Section 5 of [RFC1950], Section 6 of [RFC1951], and
+   Section 4 of [RFC1952].
+
+5.  IANA Considerations
+
+   IANA has updated the "Application Media Types" registry to include
+   'application/zlib' as described in Section 2 and 'application/gzip'
+   as described in Section 3.
+
+6.  Normative References
+
+   [RFC1950]  Deutsch, P. and J-L. Gailly, "ZLIB Compressed Data Format
+              Specification version 3.3", RFC 1950, May 1996.
+
+   [RFC1951]  Deutsch, P., "DEFLATE Compressed Data Format Specification
+              version 1.3", RFC 1951, May 1996.
+
+   [RFC1952]  Deutsch, P., "GZIP file format specification version 4.3",
+              RFC 1952, May 1996.
+
+Author's Address
+
+   John Levine
+   Taughannock Networks
+   PO Box 727
+   Trumansburg, NY  14886
+
+   Phone: +1 831 480 2300
+   EMail: standards@taugh.com
+
+
+
+
+
+Levine                        Informational                     [Page 4]
+