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Hypertext Transfer Protocol -- HTTP/1.1
RFC 2616

Document type: RFC - Draft Standard (June 1999; Errata)
Obsoletes RFC 2068
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, ps, html

IETF State: (None)
Document shepherd: No shepherd assigned

IESG State: RFC 2616 (Draft Standard)
Responsible AD: (None)
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Network Working Group                                      R. Fielding
Request for Comments: 2616                                   UC Irvine
Obsoletes: 2068                                              J. Gettys
Category: Standards Track                                   Compaq/W3C
                                                              J. Mogul
                                                                Compaq
                                                            H. Frystyk
                                                               W3C/MIT
                                                           L. Masinter
                                                                 Xerox
                                                              P. Leach
                                                             Microsoft
                                                        T. Berners-Lee
                                                               W3C/MIT
                                                             June 1999

                Hypertext Transfer Protocol -- HTTP/1.1

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 (1999).  All Rights Reserved.

Abstract

   The Hypertext Transfer Protocol (HTTP) is an application-level
   protocol for distributed, collaborative, hypermedia information
   systems. It is a generic, stateless, protocol which can be used for
   many tasks beyond its use for hypertext, such as name servers and
   distributed object management systems, through extension of its
   request methods, error codes and headers [47]. A feature of HTTP is
   the typing and negotiation of data representation, allowing systems
   to be built independently of the data being transferred.

   HTTP has been in use by the World-Wide Web global information
   initiative since 1990. This specification defines the protocol
   referred to as "HTTP/1.1", and is an update to RFC 2068 [33].

Fielding, et al.            Standards Track                     [Page 1]
RFC 2616                        HTTP/1.1                       June 1999

Table of Contents

   1   Introduction ...................................................7
   1.1    Purpose......................................................7
   1.2   Requirements .................................................8
   1.3   Terminology ..................................................8
   1.4   Overall Operation ...........................................12
   2   Notational Conventions and Generic Grammar ....................14
   2.1   Augmented BNF ...............................................14
   2.2   Basic Rules .................................................15
   3   Protocol Parameters ...........................................17
   3.1   HTTP Version ................................................17
   3.2   Uniform Resource Identifiers ................................18
   3.2.1    General Syntax ...........................................19
   3.2.2    http URL .................................................19
   3.2.3    URI Comparison ...........................................20
   3.3   Date/Time Formats ...........................................20
   3.3.1    Full Date ................................................20
   3.3.2    Delta Seconds ............................................21
   3.4   Character Sets ..............................................21
   3.4.1    Missing Charset ..........................................22
   3.5   Content Codings .............................................23
   3.6   Transfer Codings ............................................24
   3.6.1    Chunked Transfer Coding ..................................25
   3.7   Media Types .................................................26
   3.7.1    Canonicalization and Text Defaults .......................27
   3.7.2    Multipart Types ..........................................27
   3.8   Product Tokens ..............................................28
   3.9   Quality Values ..............................................29
   3.10  Language Tags ...............................................29
   3.11  Entity Tags .................................................30
   3.12  Range Units .................................................30
   4   HTTP Message ..................................................31
   4.1   Message Types ...............................................31

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