<?xml version='1.0'?>

<reference anchor='RFC2145'>

<front>
<title abbrev='HTTP Version Numbers'>Use and Interpretation of HTTP Version Numbers</title>
<author initials='J.C.' surname='Mogul' fullname='Jeffrey C. Mogul'>
<organization>Western Research Laboratory</organization>
<address>
<postal>
<street>Digital Equipment Corporation</street>
<street>250 University Avenue</street>
<street>Palo Alto</street>
<street>California</street>
<street>94305</street>
<country>USA</country></postal>
<email>mogul@wrl.dec.com</email></address></author>
<author initials='R.T.' surname='Fielding' fullname='Roy T. Fielding'>
<organization>Department of Information and Computer Science</organization>
<address>
<postal>
<street>University of California</street>
<street>Irvine</street>
<street>CA 92717-3425</street>
<country>USA</country></postal>
<facsimile>+1 (714) 824-4056</facsimile>
<email>fielding@ics.uci.edu</email></address></author>
<author initials='J.' surname='Gettys' fullname='Jim Gettys'>
<organization>MIT Laboratory for Computer Science</organization>
<address>
<postal>
<street>545 Technology Square</street>
<street>Cambridge</street>
<street>MA 02139</street>
<country>USA</country></postal>
<facsimile>+1 (617) 258 8682</facsimile>
<email>jg@w3.org</email></address></author>
<author initials='H.F.' surname='Nielsen' fullname='Henrik Frystyk Nielsen'>
<organization>W3 Consortium</organization>
<address>
<postal>
<street>MIT Laboratory for Computer Science</street>
<street>545 Technology Square</street>
<street>Cambridge</street>
<street>MA 02139</street>
<country>USA</country></postal>
<facsimile>+1 (617) 258 8682</facsimile>
<email>frystyk@w3.org</email></address></author>
<date month='May' year='1997' />
<area>Applications</area>
<keyword>HTTP</keyword>
<keyword>hypertext transfer protocol</keyword>
<abstract>
<t>
   HTTP request and response messages include an HTTP protocol version
   number.  Some confusion exists concerning the proper use and
   interpretation of HTTP version numbers, and concerning
   interoperability of HTTP implementations of different protocol
   versions.  This document is an attempt to clarify the situation.  It
   is not a modification of the intended meaning of the existing
   HTTP/1.0 and HTTP/1.1 documents, but it does describe the intention
   of the authors of those documents, and can be considered definitive
   when there is any ambiguity in those documents concerning HTTP
   version numbers, for all versions of HTTP.
</t></abstract></front>

<seriesInfo name='RFC' value='2145' />
<format type='HTML' octets='25554' target='http://xml.resource.org/public/rfc/html/rfc2145.html' />
<format type='XML' octets='14130' target='http://xml.resource.org/public/rfc/xml/rfc2145.xml' />
</reference>
