In the first version of HTTP protocol, HTTP/1.0, every resource request requires a separate connection to a server. The next version, HTTP/1.1 introduced an improvement over that. code example

Example: HTTP/1.1

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
   4.2   Message Headers .............................................31
   4.3   Message Body ................................................32
   4.4   Message Length ..............................................33
   4.5   General Header Fields .......................................34
   5   Request .......................................................35
   5.1   Request-Line ................................................35
   5.1.1    Method ...................................................36
   5.1.2    Request-URI ..............................................36
   5.2   The Resource Identified by a Request ........................38
   5.3   Request Header Fields .......................................38
   6   Response ......................................................39
   6.1   Status-Line .................................................39
   6.1.1    Status Code and Reason Phrase ............................39
   6.2   Response Header Fields ......................................41



Fielding, et al.            Standards Track                     [Page 2]