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40<body > 
41  <table border="0" cellpadding="0" cellspacing="0"> 
42  <tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p4-conditional-00.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p4-conditional-01.txt&nbsp;</th><th></th></tr> 
43      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
44      <tr><td class="lineno" valign="top"></td><td class="left">Network Working Group                                   R. Fielding, Ed.</td><td> </td><td class="right">Network Working Group                                   R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="left">Internet-Draft                                              Day Software</td><td> </td><td class="right">Internet-Draft                                              Day Software</td><td class="lineno" valign="top"></td></tr>
46      <tr><td><a name="diff0001" /></td></tr>
47      <tr><td class="lineno" valign="top"></td><td class="lblock">Obsoletes: <span class="delete">2068,</span> 2616                                          <span class="delete">J. Gettys</span></td><td> </td><td class="rblock">Obsoletes: 2616 (if approved)                                  <span class="insert">J. Gettys</span></td><td class="lineno" valign="top"></td></tr>
48      <tr><td class="lineno" valign="top"></td><td class="lblock">(if approved)                                       <span class="delete">One Laptop per Child</span></td><td> </td><td class="rblock">Intended status: Standards Track                    <span class="insert">One Laptop per Child</span></td><td class="lineno" valign="top"></td></tr>
49      <tr><td class="lineno" valign="top"></td><td class="lblock">Intended status: Standards Track                                <span class="delete">J. Mogul</span></td><td> </td><td class="rblock">Expires: <span class="insert">July 15,</span> 2008                                          <span class="insert">J. Mogul</span></td><td class="lineno" valign="top"></td></tr>
50      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">June 22,</span> 2008                                                HP</td><td> </td><td class="rblock">                                                                      HP</td><td class="lineno" valign="top"></td></tr>
51      <tr><td class="lineno" valign="top"></td><td class="left">                                                              H. Frystyk</td><td> </td><td class="right">                                                              H. Frystyk</td><td class="lineno" valign="top"></td></tr>
52      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
53      <tr><td class="lineno" valign="top"></td><td class="left">                                                             L. Masinter</td><td> </td><td class="right">                                                             L. Masinter</td><td class="lineno" valign="top"></td></tr>
54      <tr><td class="lineno" valign="top"></td><td class="left">                                                           Adobe Systems</td><td> </td><td class="right">                                                           Adobe Systems</td><td class="lineno" valign="top"></td></tr>
55      <tr><td class="lineno" valign="top"></td><td class="left">                                                                P. Leach</td><td> </td><td class="right">                                                                P. Leach</td><td class="lineno" valign="top"></td></tr>
56      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
57      <tr><td class="lineno" valign="top"></td><td class="left">                                                          T. Berners-Lee</td><td> </td><td class="right">                                                          T. Berners-Lee</td><td class="lineno" valign="top"></td></tr>
58      <tr><td class="lineno" valign="top"></td><td class="left">                                                                 W3C/MIT</td><td> </td><td class="right">                                                                 W3C/MIT</td><td class="lineno" valign="top"></td></tr>
59      <tr><td><a name="diff0002" /></td></tr>
60      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                       <span class="delete">December 20, 2007</span></td><td> </td><td class="rblock">                                                           <span class="insert">Y. Lafon, Ed.</span></td><td class="lineno" valign="top"></td></tr>
61      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">                                                                     W3C</span></td><td class="lineno" valign="top"></td></tr>
62      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">                                                         J. Reschke, Ed.</span></td><td class="lineno" valign="top"></td></tr>
63      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">                                                              greenbytes</span></td><td class="lineno" valign="top"></td></tr>
64      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">                                                        January 12, 2008</span></td><td class="lineno" valign="top"></td></tr>
65      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
66      <tr><td class="lineno" valign="top"></td><td class="left">                 HTTP/1.1, part 4: Conditional Requests</td><td> </td><td class="right">                 HTTP/1.1, part 4: Conditional Requests</td><td class="lineno" valign="top"></td></tr>
67      <tr><td><a name="diff0003" /></td></tr>
68      <tr><td class="lineno" valign="top"></td><td class="lblock">                  draft-ietf-httpbis-p4-conditional-0<span class="delete">0</span></td><td> </td><td class="rblock">                  draft-ietf-httpbis-p4-conditional-0<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
69      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
70      <tr><td class="lineno" valign="top"></td><td class="left">Status of this Memo</td><td> </td><td class="right">Status of this Memo</td><td class="lineno" valign="top"></td></tr>
71      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
72      <tr><td class="lineno" valign="top"></td><td class="left">   By submitting this Internet-Draft, each author represents that any</td><td> </td><td class="right">   By submitting this Internet-Draft, each author represents that any</td><td class="lineno" valign="top"></td></tr>
73      <tr><td class="lineno" valign="top"></td><td class="left">   applicable patent or other IPR claims of which he or she is aware</td><td> </td><td class="right">   applicable patent or other IPR claims of which he or she is aware</td><td class="lineno" valign="top"></td></tr>
74      <tr><td class="lineno" valign="top"></td><td class="left">   have been or will be disclosed, and any of which he or she becomes</td><td> </td><td class="right">   have been or will be disclosed, and any of which he or she becomes</td><td class="lineno" valign="top"></td></tr>
75      <tr><td class="lineno" valign="top"></td><td class="left">   aware will be disclosed, in accordance with Section 6 of BCP 79.</td><td> </td><td class="right">   aware will be disclosed, in accordance with Section 6 of BCP 79.</td><td class="lineno" valign="top"></td></tr>
76      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
77      <tr><td class="lineno" valign="top"></td><td class="left">   Internet-Drafts are working documents of the Internet Engineering</td><td> </td><td class="right">   Internet-Drafts are working documents of the Internet Engineering</td><td class="lineno" valign="top"></td></tr>
78      <tr><td class="lineno" valign="top"></td><td class="left">   Task Force (IETF), its areas, and its working groups.  Note that</td><td> </td><td class="right">   Task Force (IETF), its areas, and its working groups.  Note that</td><td class="lineno" valign="top"></td></tr>
79      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
80      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 1, line 45</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 1, line 49</em></th><td></td></tr>
81      <tr><td class="lineno" valign="top"></td><td class="left">   and may be updated, replaced, or obsoleted by other documents at any</td><td> </td><td class="right">   and may be updated, replaced, or obsoleted by other documents at any</td><td class="lineno" valign="top"></td></tr>
82      <tr><td class="lineno" valign="top"></td><td class="left">   time.  It is inappropriate to use Internet-Drafts as reference</td><td> </td><td class="right">   time.  It is inappropriate to use Internet-Drafts as reference</td><td class="lineno" valign="top"></td></tr>
83      <tr><td class="lineno" valign="top"></td><td class="left">   material or to cite them other than as "work in progress."</td><td> </td><td class="right">   material or to cite them other than as "work in progress."</td><td class="lineno" valign="top"></td></tr>
84      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
85      <tr><td class="lineno" valign="top"></td><td class="left">   The list of current Internet-Drafts can be accessed at</td><td> </td><td class="right">   The list of current Internet-Drafts can be accessed at</td><td class="lineno" valign="top"></td></tr>
86      <tr><td class="lineno" valign="top"></td><td class="left">   http://www.ietf.org/ietf/1id-abstracts.txt.</td><td> </td><td class="right">   http://www.ietf.org/ietf/1id-abstracts.txt.</td><td class="lineno" valign="top"></td></tr>
87      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
88      <tr><td class="lineno" valign="top"></td><td class="left">   The list of Internet-Draft Shadow Directories can be accessed at</td><td> </td><td class="right">   The list of Internet-Draft Shadow Directories can be accessed at</td><td class="lineno" valign="top"></td></tr>
89      <tr><td class="lineno" valign="top"></td><td class="left">   http://www.ietf.org/shadow.html.</td><td> </td><td class="right">   http://www.ietf.org/shadow.html.</td><td class="lineno" valign="top"></td></tr>
90      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
91      <tr><td><a name="diff0004" /></td></tr>
92      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on Ju<span class="delete">ne 22</span>, 2008.</td><td> </td><td class="rblock">   This Internet-Draft will expire on Ju<span class="insert">ly 15</span>, 2008.</td><td class="lineno" valign="top"></td></tr>
93      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
94      <tr><td class="lineno" valign="top"></td><td class="left">Copyright Notice</td><td> </td><td class="right">Copyright Notice</td><td class="lineno" valign="top"></td></tr>
95      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
96      <tr><td><a name="diff0005" /></td></tr>
97      <tr><td class="lineno" valign="top"></td><td class="lblock">   Copyright (C) The IETF Trust (200<span class="delete">7</span>).</td><td> </td><td class="rblock">   Copyright (C) The IETF Trust (200<span class="insert">8</span>).</td><td class="lineno" valign="top"></td></tr>
98      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
99      <tr><td class="lineno" valign="top"></td><td class="left">Abstract</td><td> </td><td class="right">Abstract</td><td class="lineno" valign="top"></td></tr>
100      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
101      <tr><td class="lineno" valign="top"></td><td class="left">   The Hypertext Transfer Protocol (HTTP) is an application-level</td><td> </td><td class="right">   The Hypertext Transfer Protocol (HTTP) is an application-level</td><td class="lineno" valign="top"></td></tr>
102      <tr><td class="lineno" valign="top"></td><td class="left">   protocol for distributed, collaborative, hypermedia information</td><td> </td><td class="right">   protocol for distributed, collaborative, hypermedia information</td><td class="lineno" valign="top"></td></tr>
103      <tr><td class="lineno" valign="top"></td><td class="left">   systems.  HTTP has been in use by the World Wide Web global</td><td> </td><td class="right">   systems.  HTTP has been in use by the World Wide Web global</td><td class="lineno" valign="top"></td></tr>
104      <tr><td class="lineno" valign="top"></td><td class="left">   information initiative since 1990.  This document is Part 4 of the</td><td> </td><td class="right">   information initiative since 1990.  This document is Part 4 of the</td><td class="lineno" valign="top"></td></tr>
105      <tr><td class="lineno" valign="top"></td><td class="left">   seven-part specification that defines the protocol referred to as</td><td> </td><td class="right">   seven-part specification that defines the protocol referred to as</td><td class="lineno" valign="top"></td></tr>
106      <tr><td class="lineno" valign="top"></td><td class="left">   "HTTP/1.1" and, taken together, obsoletes RFC 2616.  Part 4 defines</td><td> </td><td class="right">   "HTTP/1.1" and, taken together, obsoletes RFC 2616.  Part 4 defines</td><td class="lineno" valign="top"></td></tr>
107      <tr><td class="lineno" valign="top"></td><td class="left">   request header fields for indicating conditional requests and the</td><td> </td><td class="right">   request header fields for indicating conditional requests and the</td><td class="lineno" valign="top"></td></tr>
108      <tr><td class="lineno" valign="top"></td><td class="left">   rules for constructing responses to those requests.</td><td> </td><td class="right">   rules for constructing responses to those requests.</td><td class="lineno" valign="top"></td></tr>
109      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
110      <tr><td class="lineno" valign="top"></td><td class="left">Editorial Note (To be removed by RFC Editor)</td><td> </td><td class="right">Editorial Note (To be removed by RFC Editor)</td><td class="lineno" valign="top"></td></tr>
111      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
112      <tr><td><a name="diff0006" /></td></tr>
113      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">This version of the HTTP specification contains only minimal</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
114      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   editorial changes from [RFC2616] (abstract, introductory paragraph,</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
115      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   and authors' addresses).  All other changes are due to partitioning</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
116      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   the original into seven mostly independent parts.  The intent is for</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
117      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   readers of future drafts to able to use draft 00 as the basis for</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
118      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   comparison when the WG makes later changes to the specification text.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
119      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   This draft will shortly be followed by draft 01 (containing the first</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
120      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   round of changes that have already been agreed to on the mailing</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
121      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   list).  There is no point in reviewing this draft other than to</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
122      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   verify that the partitioning has been done correctly.  Roy T.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Fielding, Yves Lafon, and Julian Reschke will be the editors after</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
124      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   draft 00 is submitted.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
125      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                                         </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
126      <tr><td class="lineno" valign="top"></td><td class="left">   Discussion of this draft should take place on the HTTPBIS working</td><td> </td><td class="right">   Discussion of this draft should take place on the HTTPBIS working</td><td class="lineno" valign="top"></td></tr>
127      <tr><td class="lineno" valign="top"></td><td class="left">   group mailing list (ietf-http-wg@w3.org).  The current issues list is</td><td> </td><td class="right">   group mailing list (ietf-http-wg@w3.org).  The current issues list is</td><td class="lineno" valign="top"></td></tr>
128      <tr><td><a name="diff0007" /></td></tr>
129      <tr><td class="lineno" valign="top"></td><td class="lblock">   at &lt;http://www<span class="delete">3</span>.tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td> </td><td class="rblock">   at &lt;http://www.tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td class="lineno" valign="top"></td></tr>
130      <tr><td class="lineno" valign="top"></td><td class="left">   documents (including fancy diffs) can be found at</td><td> </td><td class="right">   documents (including fancy diffs) can be found at</td><td class="lineno" valign="top"></td></tr>
131      <tr><td><a name="diff0008" /></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">&lt;http://www3.tools.ietf.org/wg/httpbis/&gt;.</span></td><td> </td><td class="rblock">   <span class="insert">&lt;http://www.tools.ietf.org/wg/httpbis/&gt;.</span></td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
134      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   This draft incorporates those issue resolutions that were either</span></td><td class="lineno" valign="top"></td></tr>
135      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   collected in the original RFC2616 errata list</span></td><td class="lineno" valign="top"></td></tr>
136      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   (&lt;http://purl.org/NET/http-errata&gt;), or which were agreed upon on the</span></td><td class="lineno" valign="top"></td></tr>
137      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   mailing list between October 2006 and November 2007 (as published in</span></td><td class="lineno" valign="top"></td></tr>
138      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   "draft-lafon-rfc2616bis-03").</span></td><td class="lineno" valign="top"></td></tr>
139      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="left">Table of Contents</td><td> </td><td class="right">Table of Contents</td><td class="lineno" valign="top"></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
142      <tr><td class="lineno" valign="top"></td><td class="left">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4</td><td> </td><td class="right">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4</td><td class="lineno" valign="top"></td></tr>
143      <tr><td><a name="diff0009" /></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     1.1.  Requirements . . . . . . . . . . . . . . . . . . . . . . .  4</span></td><td class="lineno" valign="top"></td></tr>
145      <tr><td class="lineno" valign="top"></td><td class="left">   2.  Entity Tags  . . . . . . . . . . . . . . . . . . . . . . . . .  4</td><td> </td><td class="right">   2.  Entity Tags  . . . . . . . . . . . . . . . . . . . . . . . . .  4</td><td class="lineno" valign="top"></td></tr>
146      <tr><td><a name="diff0010" /></td></tr>
147      <tr><td class="lineno" valign="top"></td><td class="lblock">   3.  Status Code Definitions  . . . . . . . . . . . . . . . . . . .  <span class="delete">4</span></td><td> </td><td class="rblock">   3.  Status Code Definitions  . . . . . . . . . . . . . . . . . . .  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.1.  304 Not Modified . . . . . . . . . . . . . . . . . . . . .  <span class="delete">4</span></td><td> </td><td class="rblock">     3.1.  304 Not Modified . . . . . . . . . . . . . . . . . . . . .  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
149      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.2.  412 Precondition Failed  . . . . . . . . . . . . . . . . .  <span class="delete">5</span></td><td> </td><td class="rblock">     3.2.  412 Precondition Failed  . . . . . . . . . . . . . . . . .  <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
150      <tr><td class="lineno" valign="top"></td><td class="lblock">   4.  Weak and Strong Validators . . . . . . . . . . . . . . . . . .  <span class="delete">5</span></td><td> </td><td class="rblock">   4.  Weak and Strong Validators . . . . . . . . . . . . . . . . . .  <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
151      <tr><td class="lineno" valign="top"></td><td class="lblock">   5.  Rules for When to Use Entity Tags and Last-Modified Dates  . .  <span class="delete">8</span></td><td> </td><td class="rblock">   5.  Rules for When to Use Entity Tags and Last-Modified Dates  . .  <span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
152      <tr><td class="lineno" valign="top"></td><td class="left">   6.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 10</td><td> </td><td class="right">   6.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 10</td><td class="lineno" valign="top"></td></tr>
153      <tr><td><a name="diff0011" /></td></tr>
154      <tr><td class="lineno" valign="top"></td><td class="lblock">     6.1.  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">10</span></td><td> </td><td class="rblock">     6.1.  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="lblock">     6.2.  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">10</span></td><td> </td><td class="rblock">     6.2.  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
156      <tr><td class="lineno" valign="top"></td><td class="lblock">     6.3.  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . <span class="delete">11</span></td><td> </td><td class="rblock">     6.3.  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . <span class="insert">12</span></td><td class="lineno" valign="top"></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="lblock">     6.4.  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">13</span></td><td> </td><td class="rblock">     6.4.  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . <span class="insert">14</span></td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno" valign="top"></td><td class="lblock">     6.5.  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . <span class="delete">14</span></td><td> </td><td class="rblock">     6.5.  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . <span class="insert">15</span></td><td class="lineno" valign="top"></td></tr>
159      <tr><td class="lineno" valign="top"></td><td class="lblock">     6.6.  Last-Modified  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">15</span></td><td> </td><td class="rblock">     6.6.  Last-Modified  . . . . . . . . . . . . . . . . . . . . . . <span class="insert">16</span></td><td class="lineno" valign="top"></td></tr>
160      <tr><td class="lineno" valign="top"></td><td class="lblock">   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . <span class="delete">15</span></td><td> </td><td class="rblock">   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . <span class="insert">16</span></td><td class="lineno" valign="top"></td></tr>
161      <tr><td class="lineno" valign="top"></td><td class="left">   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="right">   8.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
162      <tr><td class="lineno" valign="top"></td><td class="left">   9.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="right">   9.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
163      <tr><td><a name="diff0012" /></td></tr>
164      <tr><td class="lineno" valign="top"></td><td class="lblock">   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">16</span></td><td> </td><td class="rblock">   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
165      <tr><td class="lineno" valign="top"></td><td class="lblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">16</span></td><td> </td><td class="rblock"><span class="insert">     10.1. Normative References . . . . . . . . . . . . . . . . . . . 17</span></td><td class="lineno" valign="top"></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="lblock">   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">17</span></td><td> </td><td class="rblock"><span class="insert">     10.2. Informative References . . . . . . . . . . . . . . . . . . 17</span></td><td class="lineno" valign="top"></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="lblock">   Intellectual Property and Copyright Statements . . . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock"><span class="insert">   Appendix A.  Compatibility with Previous Versions  . . . . . . . . 17</span></td><td class="lineno" valign="top"></td></tr>
168      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     A.1.  Changes from RFC 2616  . . . . . . . . . . . . . . . . . . 17</span></td><td class="lineno" valign="top"></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Appendix B.  Change Log (to be removed by RFC Editor before</span></td><td class="lineno" valign="top"></td></tr>
170      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">                publication)  . . . . . . . . . . . . . . . . . . . . 17</span></td><td class="lineno" valign="top"></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     B.1.  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . 17</span></td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     B.2.  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 18</span></td><td class="lineno" valign="top"></td></tr>
173      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
174      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
175      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   Intellectual Property and Copyright Statements . . . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
176      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
177      <tr><td class="lineno" valign="top"></td><td class="left">1.  Introduction</td><td> </td><td class="right">1.  Introduction</td><td class="lineno" valign="top"></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
179      <tr><td><a name="diff0013" /></td></tr>
180      <tr><td class="lineno" valign="top"></td><td class="lblock">   This document <span class="delete">will define aspects of HTTP related</span> to conditional</td><td> </td><td class="rblock">   This document <span class="insert">defines HTTP/1.1 response metadata for indicating</span></td><td class="lineno" valign="top"></td></tr>
181      <tr><td class="lineno" valign="top"></td><td class="lblock">   request <span class="delete">messages based</span> on <span class="delete">time stamps</span> and <span class="delete">entity-tags.  Right now it</span></td><td> </td><td class="rblock"><span class="insert">   potential changes</span> to <span class="insert">payload content, including modification time</span></td><td class="lineno" valign="top"></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   only includes</span> the <span class="delete">extracted relevant</span> sections of <span class="delete">RFC 2616 [RFC2616]</span></td><td> </td><td class="rblock"><span class="insert">   stamps and opaque entity-tags, and the HTTP</span> conditional request</td><td class="lineno" valign="top"></td></tr>
183      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   without edit.</span></td><td> </td><td class="rblock">   <span class="insert">mechanisms that allow preconditions to be placed</span> on <span class="insert">a request method.</span></td><td class="lineno" valign="top"></td></tr>
184      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Conditional GET requests allow for efficient cache updates.  Other</span></td><td class="lineno" valign="top"></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   conditional request methods are used to protect against overwriting</span></td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   or misunderstanding the state of a resource that has been changed</span></td><td class="lineno" valign="top"></td></tr>
187      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   unbeknownst to the requesting client.</span></td><td class="lineno" valign="top"></td></tr>
188      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
189      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   This document is currently disorganized in order to minimize the</span></td><td class="lineno" valign="top"></td></tr>
190      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   changes between drafts</span> and <span class="insert">enable reviewers to see the smaller errata</span></td><td class="lineno" valign="top"></td></tr>
191      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   changes.  The next draft will reorganize</span> the sections <span class="insert">to better</span></td><td class="lineno" valign="top"></td></tr>
192      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   reflect the content.  In particular, the sections on resource</span></td><td class="lineno" valign="top"></td></tr>
193      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   metadata will be discussed first and then followed by each</span></td><td class="lineno" valign="top"></td></tr>
194      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   conditional request-header, concluding with a definition of</span></td><td class="lineno" valign="top"></td></tr>
195      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   precedence and the expectation</span> of <span class="insert">ordering strong validator checks</span></td><td class="lineno" valign="top"></td></tr>
196      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   before weak validator checks.  It is likely that more content from</span></td><td class="lineno" valign="top"></td></tr>
197      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   [Part6] will migrate to this part, where appropriate.  The current</span></td><td class="lineno" valign="top"></td></tr>
198      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   mess reflects how widely dispersed these topics and associated</span></td><td class="lineno" valign="top"></td></tr>
199      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   requirements had become in [RFC2616].</span></td><td class="lineno" valign="top"></td></tr>
200      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
201      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">1.1.  Requirements</span></td><td class="lineno" valign="top"></td></tr>
202      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
203      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</span></td><td class="lineno" valign="top"></td></tr>
204      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this</span></td><td class="lineno" valign="top"></td></tr>
205      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   document are to be interpreted as described in [RFC2119].</span></td><td class="lineno" valign="top"></td></tr>
206      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
207      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   An implementation is not compliant if it fails to satisfy one or more</span></td><td class="lineno" valign="top"></td></tr>
208      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   of the MUST or REQUIRED level requirements for the protocols it</span></td><td class="lineno" valign="top"></td></tr>
209      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   implements.  An implementation that satisfies all the MUST or</span></td><td class="lineno" valign="top"></td></tr>
210      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   REQUIRED level and all the SHOULD level requirements for its</span></td><td class="lineno" valign="top"></td></tr>
211      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   protocols is said to be "unconditionally compliant"; one that</span></td><td class="lineno" valign="top"></td></tr>
212      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   satisfies all the MUST level requirements but not all the SHOULD</span></td><td class="lineno" valign="top"></td></tr>
213      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   level requirements for its protocols is said to be "conditionally</span></td><td class="lineno" valign="top"></td></tr>
214      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   compliant."</span></td><td class="lineno" valign="top"></td></tr>
215      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="left">2.  Entity Tags</td><td> </td><td class="right">2.  Entity Tags</td><td class="lineno" valign="top"></td></tr>
217      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
218      <tr><td class="lineno" valign="top"></td><td class="left">   Entity tags are used for comparing two or more entities from the same</td><td> </td><td class="right">   Entity tags are used for comparing two or more entities from the same</td><td class="lineno" valign="top"></td></tr>
219      <tr><td class="lineno" valign="top"></td><td class="left">   requested resource.  HTTP/1.1 uses entity tags in the ETag</td><td> </td><td class="right">   requested resource.  HTTP/1.1 uses entity tags in the ETag</td><td class="lineno" valign="top"></td></tr>
220      <tr><td class="lineno" valign="top"></td><td class="left">   (Section 6.1), If-Match (Section 6.2), If-None-Match (Section 6.4),</td><td> </td><td class="right">   (Section 6.1), If-Match (Section 6.2), If-None-Match (Section 6.4),</td><td class="lineno" valign="top"></td></tr>
221      <tr><td class="lineno" valign="top"></td><td class="left">   and If-Range (Section 5.3 of [Part5]) header fields.  The definition</td><td> </td><td class="right">   and If-Range (Section 5.3 of [Part5]) header fields.  The definition</td><td class="lineno" valign="top"></td></tr>
222      <tr><td class="lineno" valign="top"></td><td class="left">   of how they are used and compared as cache validators is in</td><td> </td><td class="right">   of how they are used and compared as cache validators is in</td><td class="lineno" valign="top"></td></tr>
223      <tr><td class="lineno" valign="top"></td><td class="left">   Section 4.  An entity tag consists of an opaque quoted string,</td><td> </td><td class="right">   Section 4.  An entity tag consists of an opaque quoted string,</td><td class="lineno" valign="top"></td></tr>
224      <tr><td class="lineno" valign="top"></td><td class="left">   possibly prefixed by a weakness indicator.</td><td> </td><td class="right">   possibly prefixed by a weakness indicator.</td><td class="lineno" valign="top"></td></tr>
225      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
226      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 5, line 11</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 5, line 40</em></th><td></td></tr>
227      <tr><td class="lineno" valign="top"></td><td class="left">   respond with this status code.  The 304 response MUST NOT contain a</td><td> </td><td class="right">   respond with this status code.  The 304 response MUST NOT contain a</td><td class="lineno" valign="top"></td></tr>
228      <tr><td class="lineno" valign="top"></td><td class="left">   message-body, and thus is always terminated by the first empty line</td><td> </td><td class="right">   message-body, and thus is always terminated by the first empty line</td><td class="lineno" valign="top"></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="left">   after the header fields.</td><td> </td><td class="right">   after the header fields.</td><td class="lineno" valign="top"></td></tr>
230      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
231      <tr><td class="lineno" valign="top"></td><td class="left">   The response MUST include the following header fields:</td><td> </td><td class="right">   The response MUST include the following header fields:</td><td class="lineno" valign="top"></td></tr>
232      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
233      <tr><td class="lineno" valign="top"></td><td class="left">   o  Date, unless its omission is required by Section 8.3.1 of [Part1]</td><td> </td><td class="right">   o  Date, unless its omission is required by Section 8.3.1 of [Part1]</td><td class="lineno" valign="top"></td></tr>
234      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
235      <tr><td class="lineno" valign="top"></td><td class="left">   If a clockless origin server obeys these rules, and proxies and</td><td> </td><td class="right">   If a clockless origin server obeys these rules, and proxies and</td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="left">   clients add their own Date to any response received without one (as</td><td> </td><td class="right">   clients add their own Date to any response received without one (as</td><td class="lineno" valign="top"></td></tr>
237      <tr><td><a name="diff0014" /></td></tr>
238      <tr><td class="lineno" valign="top"></td><td class="lblock">   already specified by [RFC2068], <span class="delete">s</span>ection 14.19), caches will operate</td><td> </td><td class="rblock">   already specified by [RFC2068], <span class="insert">S</span>ection 14.19), caches will operate</td><td class="lineno" valign="top"></td></tr>
239      <tr><td class="lineno" valign="top"></td><td class="left">   correctly.</td><td> </td><td class="right">   correctly.</td><td class="lineno" valign="top"></td></tr>
240      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
241      <tr><td class="lineno" valign="top"></td><td class="left">   o  ETag and/or Content-Location, if the header would have been sent</td><td> </td><td class="right">   o  ETag and/or Content-Location, if the header would have been sent</td><td class="lineno" valign="top"></td></tr>
242      <tr><td class="lineno" valign="top"></td><td class="left">      in a 200 response to the same request</td><td> </td><td class="right">      in a 200 response to the same request</td><td class="lineno" valign="top"></td></tr>
243      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
244      <tr><td class="lineno" valign="top"></td><td class="left">   o  Expires, Cache-Control, and/or Vary, if the field-value might</td><td> </td><td class="right">   o  Expires, Cache-Control, and/or Vary, if the field-value might</td><td class="lineno" valign="top"></td></tr>
245      <tr><td class="lineno" valign="top"></td><td class="left">      differ from that sent in any previous response for the same</td><td> </td><td class="right">      differ from that sent in any previous response for the same</td><td class="lineno" valign="top"></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="left">      variant</td><td> </td><td class="right">      variant</td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
248      <tr><td><a name="diff0015" /></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="lblock">   If the conditional GET used a strong cache validator (see <span class="delete">[Part6]</span>),</td><td> </td><td class="rblock">   If the conditional GET used a strong cache validator (see <span class="insert">Section 4</span>),</td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="left">   the response SHOULD NOT include other entity-headers.  Otherwise</td><td> </td><td class="right">   the response SHOULD NOT include other entity-headers.  Otherwise</td><td class="lineno" valign="top"></td></tr>
251      <tr><td class="lineno" valign="top"></td><td class="left">   (i.e., the conditional GET used a weak validator), the response MUST</td><td> </td><td class="right">   (i.e., the conditional GET used a weak validator), the response MUST</td><td class="lineno" valign="top"></td></tr>
252      <tr><td class="lineno" valign="top"></td><td class="left">   NOT include other entity-headers; this prevents inconsistencies</td><td> </td><td class="right">   NOT include other entity-headers; this prevents inconsistencies</td><td class="lineno" valign="top"></td></tr>
253      <tr><td class="lineno" valign="top"></td><td class="left">   between cached entity-bodies and updated headers.</td><td> </td><td class="right">   between cached entity-bodies and updated headers.</td><td class="lineno" valign="top"></td></tr>
254      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
255      <tr><td class="lineno" valign="top"></td><td class="left">   If a 304 response indicates an entity not currently cached, then the</td><td> </td><td class="right">   If a 304 response indicates an entity not currently cached, then the</td><td class="lineno" valign="top"></td></tr>
256      <tr><td class="lineno" valign="top"></td><td class="left">   cache MUST disregard the response and repeat the request without the</td><td> </td><td class="right">   cache MUST disregard the response and repeat the request without the</td><td class="lineno" valign="top"></td></tr>
257      <tr><td class="lineno" valign="top"></td><td class="left">   conditional.</td><td> </td><td class="right">   conditional.</td><td class="lineno" valign="top"></td></tr>
258      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
259      <tr><td class="lineno" valign="top"></td><td class="left">   If a cache uses a received 304 response to update a cache entry, the</td><td> </td><td class="right">   If a cache uses a received 304 response to update a cache entry, the</td><td class="lineno" valign="top"></td></tr>
260      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
261      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 10, line 15</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 10, line 46</em></th><td></td></tr>
262      <tr><td class="lineno" valign="top"></td><td class="left">      HTTP/1.0 clients and caches will ignore entity tags.  Generally,</td><td> </td><td class="right">      HTTP/1.0 clients and caches will ignore entity tags.  Generally,</td><td class="lineno" valign="top"></td></tr>
263      <tr><td class="lineno" valign="top"></td><td class="left">      last-modified values received or used by these systems will</td><td> </td><td class="right">      last-modified values received or used by these systems will</td><td class="lineno" valign="top"></td></tr>
264      <tr><td class="lineno" valign="top"></td><td class="left">      support transparent and efficient caching, and so HTTP/1.1 origin</td><td> </td><td class="right">      support transparent and efficient caching, and so HTTP/1.1 origin</td><td class="lineno" valign="top"></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="left">      servers should provide Last-Modified values.  In those rare cases</td><td> </td><td class="right">      servers should provide Last-Modified values.  In those rare cases</td><td class="lineno" valign="top"></td></tr>
266      <tr><td class="lineno" valign="top"></td><td class="left">      where the use of a Last-Modified value as a validator by an</td><td> </td><td class="right">      where the use of a Last-Modified value as a validator by an</td><td class="lineno" valign="top"></td></tr>
267      <tr><td class="lineno" valign="top"></td><td class="left">      HTTP/1.0 system could result in a serious problem, then HTTP/1.1</td><td> </td><td class="right">      HTTP/1.0 system could result in a serious problem, then HTTP/1.1</td><td class="lineno" valign="top"></td></tr>
268      <tr><td class="lineno" valign="top"></td><td class="left">      origin servers should not provide one.</td><td> </td><td class="right">      origin servers should not provide one.</td><td class="lineno" valign="top"></td></tr>
269      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
270      <tr><td class="lineno" valign="top"></td><td class="left">6.  Header Field Definitions</td><td> </td><td class="right">6.  Header Field Definitions</td><td class="lineno" valign="top"></td></tr>
271      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
272      <tr><td><a name="diff0016" /></td></tr>
273      <tr><td class="lineno" valign="top"></td><td class="lblock">   This section defines the syntax and semantics of <span class="delete">all standard</span></td><td> </td><td class="rblock">   This section defines the syntax and semantics of HTTP/1.1 header</td><td class="lineno" valign="top"></td></tr>
274      <tr><td class="lineno" valign="top"></td><td class="lblock">   HTTP/1.1 header <span class="delete">fields.</span>  For entity-header fields, both sender and</td><td> </td><td class="rblock">   <span class="insert">fields related to conditional requests.</span></td><td class="lineno" valign="top"></td></tr>
275      <tr><td class="lineno" valign="top"></td><td class="lblock">   recipient refer to either the client or the server, depending on who</td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
276      <tr><td class="lineno" valign="top"></td><td class="lblock">   sends and who receives the entity.</td><td> </td><td class="rblock">   For entity-header fields, both sender and recipient refer to either</td><td class="lineno" valign="top"></td></tr>
277      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   the client or the server, depending on who sends and who receives the</td><td class="lineno" valign="top"></td></tr>
278      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   entity.</td><td class="lineno" valign="top"></td></tr>
279      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
280      <tr><td class="lineno" valign="top"></td><td class="left">6.1.  ETag</td><td> </td><td class="right">6.1.  ETag</td><td class="lineno" valign="top"></td></tr>
281      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
282      <tr><td class="lineno" valign="top"></td><td class="left">   The ETag response-header field provides the current value of the</td><td> </td><td class="right">   The ETag response-header field provides the current value of the</td><td class="lineno" valign="top"></td></tr>
283      <tr><td class="lineno" valign="top"></td><td class="left">   entity tag for the requested variant.  The headers used with entity</td><td> </td><td class="right">   entity tag for the requested variant.  The headers used with entity</td><td class="lineno" valign="top"></td></tr>
284      <tr><td><a name="diff0017" /></td></tr>
285      <tr><td class="lineno" valign="top"></td><td class="lblock">   tags are described in <span class="delete">sections 6.2,</span> 6.4 and Section 5.3 of [Part5].</td><td> </td><td class="rblock">   tags are described in <span class="insert">Sections 6.2 and</span> 6.4 <span class="insert">of this document,</span> and <span class="insert">in</span></td><td class="lineno" valign="top"></td></tr>
286      <tr><td class="lineno" valign="top"></td><td class="lblock">   The entity tag MAY be used for comparison with other entities from</td><td> </td><td class="rblock">   Section 5.3 of [Part5].  The entity tag MAY be used for comparison</td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="lblock">   the same resource (see Section 4).</td><td> </td><td class="rblock">   with other entities from the same resource (see Section 4).</td><td class="lineno" valign="top"></td></tr>
288      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="left">       ETag = "ETag" ":" entity-tag</td><td> </td><td class="right">       ETag = "ETag" ":" entity-tag</td><td class="lineno" valign="top"></td></tr>
290      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
291      <tr><td class="lineno" valign="top"></td><td class="left">   Examples:</td><td> </td><td class="right">   Examples:</td><td class="lineno" valign="top"></td></tr>
292      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
293      <tr><td class="lineno" valign="top"></td><td class="left">      ETag: "xyzzy"</td><td> </td><td class="right">      ETag: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
294      <tr><td class="lineno" valign="top"></td><td class="left">      ETag: W/"xyzzy"</td><td> </td><td class="right">      ETag: W/"xyzzy"</td><td class="lineno" valign="top"></td></tr>
295      <tr><td class="lineno" valign="top"></td><td class="left">      ETag: ""</td><td> </td><td class="right">      ETag: ""</td><td class="lineno" valign="top"></td></tr>
296      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="left">6.2.  If-Match</td><td> </td><td class="right">6.2.  If-Match</td><td class="lineno" valign="top"></td></tr>
298      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
299      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 11, line 26</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 12, line 12</em></th><td></td></tr>
300      <tr><td class="lineno" valign="top"></td><td class="left">   most useful when the client wants to prevent an updating method, such</td><td> </td><td class="right">   most useful when the client wants to prevent an updating method, such</td><td class="lineno" valign="top"></td></tr>
301      <tr><td class="lineno" valign="top"></td><td class="left">   as PUT, from modifying a resource that has changed since the client</td><td> </td><td class="right">   as PUT, from modifying a resource that has changed since the client</td><td class="lineno" valign="top"></td></tr>
302      <tr><td class="lineno" valign="top"></td><td class="left">   last retrieved it.</td><td> </td><td class="right">   last retrieved it.</td><td class="lineno" valign="top"></td></tr>
303      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
304      <tr><td class="lineno" valign="top"></td><td class="left">   If the request would, without the If-Match header field, result in</td><td> </td><td class="right">   If the request would, without the If-Match header field, result in</td><td class="lineno" valign="top"></td></tr>
305      <tr><td class="lineno" valign="top"></td><td class="left">   anything other than a 2xx or 412 status, then the If-Match header</td><td> </td><td class="right">   anything other than a 2xx or 412 status, then the If-Match header</td><td class="lineno" valign="top"></td></tr>
306      <tr><td class="lineno" valign="top"></td><td class="left">   MUST be ignored.</td><td> </td><td class="right">   MUST be ignored.</td><td class="lineno" valign="top"></td></tr>
307      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
308      <tr><td class="lineno" valign="top"></td><td class="left">   The meaning of "If-Match: *" is that the method SHOULD be performed</td><td> </td><td class="right">   The meaning of "If-Match: *" is that the method SHOULD be performed</td><td class="lineno" valign="top"></td></tr>
309      <tr><td class="lineno" valign="top"></td><td class="left">   if the representation selected by the origin server (or by a cache,</td><td> </td><td class="right">   if the representation selected by the origin server (or by a cache,</td><td class="lineno" valign="top"></td></tr>
310      <tr><td><a name="diff0018" /></td></tr>
311      <tr><td class="lineno" valign="top"></td><td class="lblock">   possibly using the Vary mechanism, see Section <span class="delete">3</span>.5 of [Part6])</td><td> </td><td class="rblock">   possibly using the Vary mechanism, see Section <span class="insert">15</span>.5 of [Part6])</td><td class="lineno" valign="top"></td></tr>
312      <tr><td class="lineno" valign="top"></td><td class="left">   exists, and MUST NOT be performed if the representation does not</td><td> </td><td class="right">   exists, and MUST NOT be performed if the representation does not</td><td class="lineno" valign="top"></td></tr>
313      <tr><td class="lineno" valign="top"></td><td class="left">   exist.</td><td> </td><td class="right">   exist.</td><td class="lineno" valign="top"></td></tr>
314      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
315      <tr><td class="lineno" valign="top"></td><td class="left">   A request intended to update a resource (e.g., a PUT) MAY include an</td><td> </td><td class="right">   A request intended to update a resource (e.g., a PUT) MAY include an</td><td class="lineno" valign="top"></td></tr>
316      <tr><td class="lineno" valign="top"></td><td class="left">   If-Match header field to signal that the request method MUST NOT be</td><td> </td><td class="right">   If-Match header field to signal that the request method MUST NOT be</td><td class="lineno" valign="top"></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="left">   applied if the entity corresponding to the If-Match value (a single</td><td> </td><td class="right">   applied if the entity corresponding to the If-Match value (a single</td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="left">   entity tag) is no longer a representation of that resource.  This</td><td> </td><td class="right">   entity tag) is no longer a representation of that resource.  This</td><td class="lineno" valign="top"></td></tr>
319      <tr><td class="lineno" valign="top"></td><td class="left">   allows the user to indicate that they do not wish the request to be</td><td> </td><td class="right">   allows the user to indicate that they do not wish the request to be</td><td class="lineno" valign="top"></td></tr>
320      <tr><td class="lineno" valign="top"></td><td class="left">   successful if the resource has been changed without their knowledge.</td><td> </td><td class="right">   successful if the resource has been changed without their knowledge.</td><td class="lineno" valign="top"></td></tr>
321      <tr><td class="lineno" valign="top"></td><td class="left">   Examples:</td><td> </td><td class="right">   Examples:</td><td class="lineno" valign="top"></td></tr>
322      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
323      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 11, line 51</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 12, line 37</em></th><td></td></tr>
324      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
325      <tr><td class="lineno" valign="top"></td><td class="left">   The result of a request having both an If-Match header field and</td><td> </td><td class="right">   The result of a request having both an If-Match header field and</td><td class="lineno" valign="top"></td></tr>
326      <tr><td class="lineno" valign="top"></td><td class="left">   either an If-None-Match or an If-Modified-Since header fields is</td><td> </td><td class="right">   either an If-None-Match or an If-Modified-Since header fields is</td><td class="lineno" valign="top"></td></tr>
327      <tr><td class="lineno" valign="top"></td><td class="left">   undefined by this specification.</td><td> </td><td class="right">   undefined by this specification.</td><td class="lineno" valign="top"></td></tr>
328      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
329      <tr><td class="lineno" valign="top"></td><td class="left">6.3.  If-Modified-Since</td><td> </td><td class="right">6.3.  If-Modified-Since</td><td class="lineno" valign="top"></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
331      <tr><td class="lineno" valign="top"></td><td class="left">   The If-Modified-Since request-header field is used with a method to</td><td> </td><td class="right">   The If-Modified-Since request-header field is used with a method to</td><td class="lineno" valign="top"></td></tr>
332      <tr><td class="lineno" valign="top"></td><td class="left">   make it conditional: if the requested variant has not been modified</td><td> </td><td class="right">   make it conditional: if the requested variant has not been modified</td><td class="lineno" valign="top"></td></tr>
333      <tr><td class="lineno" valign="top"></td><td class="left">   since the time specified in this field, an entity will not be</td><td> </td><td class="right">   since the time specified in this field, an entity will not be</td><td class="lineno" valign="top"></td></tr>
334      <tr><td><a name="diff0019" /></td></tr>
335      <tr><td class="lineno" valign="top"></td><td class="lblock">   returned from the server; instead, a 304 (<span class="delete">not m</span>odified) response will</td><td> </td><td class="rblock">   returned from the server; instead, a 304 (<span class="insert">Not M</span>odified) response will</td><td class="lineno" valign="top"></td></tr>
336      <tr><td class="lineno" valign="top"></td><td class="left">   be returned without any message-body.</td><td> </td><td class="right">   be returned without any message-body.</td><td class="lineno" valign="top"></td></tr>
337      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
338      <tr><td class="lineno" valign="top"></td><td class="left">       If-Modified-Since = "If-Modified-Since" ":" HTTP-date</td><td> </td><td class="right">       If-Modified-Since = "If-Modified-Since" ":" HTTP-date</td><td class="lineno" valign="top"></td></tr>
339      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
340      <tr><td class="lineno" valign="top"></td><td class="left">   An example of the field is:</td><td> </td><td class="right">   An example of the field is:</td><td class="lineno" valign="top"></td></tr>
341      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
342      <tr><td class="lineno" valign="top"></td><td class="left">       If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT</td><td> </td><td class="right">       If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT</td><td class="lineno" valign="top"></td></tr>
343      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
344      <tr><td class="lineno" valign="top"></td><td class="left">   A GET method with an If-Modified-Since header and no Range header</td><td> </td><td class="right">   A GET method with an If-Modified-Since header and no Range header</td><td class="lineno" valign="top"></td></tr>
345      <tr><td class="lineno" valign="top"></td><td class="left">   requests that the identified entity be transferred only if it has</td><td> </td><td class="right">   requests that the identified entity be transferred only if it has</td><td class="lineno" valign="top"></td></tr>
346      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
347      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 14, line 17</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 15, line 4</em></th><td></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="left">   return a 304 (Not Modified) response.</td><td> </td><td class="right">   return a 304 (Not Modified) response.</td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
350      <tr><td class="lineno" valign="top"></td><td class="left">   If the request would, without the If-None-Match header field, result</td><td> </td><td class="right">   If the request would, without the If-None-Match header field, result</td><td class="lineno" valign="top"></td></tr>
351      <tr><td class="lineno" valign="top"></td><td class="left">   in anything other than a 2xx or 304 status, then the If-None-Match</td><td> </td><td class="right">   in anything other than a 2xx or 304 status, then the If-None-Match</td><td class="lineno" valign="top"></td></tr>
352      <tr><td class="lineno" valign="top"></td><td class="left">   header MUST be ignored.  (See Section 5 for a discussion of server</td><td> </td><td class="right">   header MUST be ignored.  (See Section 5 for a discussion of server</td><td class="lineno" valign="top"></td></tr>
353      <tr><td class="lineno" valign="top"></td><td class="left">   behavior when both If-Modified-Since and If-None-Match appear in the</td><td> </td><td class="right">   behavior when both If-Modified-Since and If-None-Match appear in the</td><td class="lineno" valign="top"></td></tr>
354      <tr><td class="lineno" valign="top"></td><td class="left">   same request.)</td><td> </td><td class="right">   same request.)</td><td class="lineno" valign="top"></td></tr>
355      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
356      <tr><td class="lineno" valign="top"></td><td class="left">   The meaning of "If-None-Match: *" is that the method MUST NOT be</td><td> </td><td class="right">   The meaning of "If-None-Match: *" is that the method MUST NOT be</td><td class="lineno" valign="top"></td></tr>
357      <tr><td class="lineno" valign="top"></td><td class="left">   performed if the representation selected by the origin server (or by</td><td> </td><td class="right">   performed if the representation selected by the origin server (or by</td><td class="lineno" valign="top"></td></tr>
358      <tr><td><a name="diff0020" /></td></tr>
359      <tr><td class="lineno" valign="top"></td><td class="lblock">   a cache, possibly using the Vary mechanism, see Section <span class="delete">3</span>.5 of</td><td> </td><td class="rblock">   a cache, possibly using the Vary mechanism, see Section <span class="insert">15</span>.5 of</td><td class="lineno" valign="top"></td></tr>
360      <tr><td class="lineno" valign="top"></td><td class="left">   [Part6]) exists, and SHOULD be performed if the representation does</td><td> </td><td class="right">   [Part6]) exists, and SHOULD be performed if the representation does</td><td class="lineno" valign="top"></td></tr>
361      <tr><td class="lineno" valign="top"></td><td class="left">   not exist.  This feature is intended to be useful in preventing races</td><td> </td><td class="right">   not exist.  This feature is intended to be useful in preventing races</td><td class="lineno" valign="top"></td></tr>
362      <tr><td class="lineno" valign="top"></td><td class="left">   between PUT operations.</td><td> </td><td class="right">   between PUT operations.</td><td class="lineno" valign="top"></td></tr>
363      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
364      <tr><td class="lineno" valign="top"></td><td class="left">   Examples:</td><td> </td><td class="right">   Examples:</td><td class="lineno" valign="top"></td></tr>
365      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
366      <tr><td class="lineno" valign="top"></td><td class="left">       If-None-Match: "xyzzy"</td><td> </td><td class="right">       If-None-Match: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
367      <tr><td class="lineno" valign="top"></td><td class="left">       If-None-Match: W/"xyzzy"</td><td> </td><td class="right">       If-None-Match: W/"xyzzy"</td><td class="lineno" valign="top"></td></tr>
368      <tr><td class="lineno" valign="top"></td><td class="left">       If-None-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td> </td><td class="right">       If-None-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td class="lineno" valign="top"></td></tr>
369      <tr><td class="lineno" valign="top"></td><td class="left">       If-None-Match: W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz"</td><td> </td><td class="right">       If-None-Match: W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz"</td><td class="lineno" valign="top"></td></tr>
370      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
371      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 16, line 12</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 17, line 5</em></th><td></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="left">   TBD.</td><td> </td><td class="right">   TBD.</td><td class="lineno" valign="top"></td></tr>
374      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
375      <tr><td class="lineno" valign="top"></td><td class="left">8.  Security Considerations</td><td> </td><td class="right">8.  Security Considerations</td><td class="lineno" valign="top"></td></tr>
376      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
377      <tr><td class="lineno" valign="top"></td><td class="left">   No additional security considerations have been identified beyond</td><td> </td><td class="right">   No additional security considerations have been identified beyond</td><td class="lineno" valign="top"></td></tr>
378      <tr><td class="lineno" valign="top"></td><td class="left">   those applicable to HTTP in general [Part1].</td><td> </td><td class="right">   those applicable to HTTP in general [Part1].</td><td class="lineno" valign="top"></td></tr>
379      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
380      <tr><td class="lineno" valign="top"></td><td class="left">9.  Acknowledgments</td><td> </td><td class="right">9.  Acknowledgments</td><td class="lineno" valign="top"></td></tr>
381      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
382      <tr><td><a name="diff0021" /></td></tr>
383      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">Based on an XML translation of RFC 2616 by Julian Reschke.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
384      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                                         </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
385      <tr><td class="lineno" valign="top"></td><td class="left">10.  References</td><td> </td><td class="right">10.  References</td><td class="lineno" valign="top"></td></tr>
386      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
387      <tr><td><a name="diff0022" /></td></tr>
388      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">10.1.  Normative References</span></td><td class="lineno" valign="top"></td></tr>
389      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
390      <tr><td class="lineno" valign="top"></td><td class="left">   [Part1]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part1]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
391      <tr><td><a name="diff0023" /></td></tr>
392      <tr><td class="lineno" valign="top"></td><td class="lblock">              Masinter, L., Leach, P., <span class="delete">and T.</span> Berners-Lee, "HTTP/1.1,</td><td> </td><td class="rblock">              Masinter, L., Leach, P., Berners-Lee, <span class="insert">T., Lafon, Y., Ed.,</span></td><td class="lineno" valign="top"></td></tr>
393      <tr><td class="lineno" valign="top"></td><td class="lblock">              part 1: URIs, Connections, and Message Parsing",</td><td> </td><td class="rblock"><span class="insert">              and J. Reschke, Ed.,</span> "HTTP/1.1, part 1: URIs, Connections,</td><td class="lineno" valign="top"></td></tr>
394      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">draft-ietf-httpbis-p1-messaging-00</span> (work in progress),</td><td> </td><td class="rblock">              and Message Parsing", <span class="insert">draft-ietf-httpbis-p1-messaging-01</span></td><td class="lineno" valign="top"></td></tr>
395      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">December 2007.</span></td><td> </td><td class="rblock">              (work in progress), <span class="insert">January 2008.</span></td><td class="lineno" valign="top"></td></tr>
396      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
397      <tr><td class="lineno" valign="top"></td><td class="left">   [Part5]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part5]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
398      <tr><td><a name="diff0024" /></td></tr>
399      <tr><td class="lineno" valign="top"></td><td class="lblock">              Masinter, L., Leach, P., <span class="delete">and T.</span> Berners-Lee, "HTTP/1.1,</td><td> </td><td class="rblock">              Masinter, L., Leach, P., Berners-Lee, <span class="insert">T., Lafon, Y., Ed.,</span></td><td class="lineno" valign="top"></td></tr>
400      <tr><td class="lineno" valign="top"></td><td class="lblock">              part 5: Range Requests and Partial Responses",</td><td> </td><td class="rblock"><span class="insert">              and J. Reschke, Ed.,</span> "HTTP/1.1, part 5: Range Requests and</td><td class="lineno" valign="top"></td></tr>
401      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">draft-ietf-httpbis-p5-range-00</span> (work in progress),</td><td> </td><td class="rblock">              Partial Responses", <span class="insert">draft-ietf-httpbis-p5-range-01</span> (work</td><td class="lineno" valign="top"></td></tr>
402      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">December 2007.</span></td><td> </td><td class="rblock">              in progress), <span class="insert">January 2008.</span></td><td class="lineno" valign="top"></td></tr>
403      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
404      <tr><td class="lineno" valign="top"></td><td class="left">   [Part6]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part6]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
405      <tr><td><a name="diff0025" /></td></tr>
406      <tr><td class="lineno" valign="top"></td><td class="lblock">              Masinter, L., Leach, P., <span class="delete">and T.</span> Berners-Lee, "HTTP/1.1,</td><td> </td><td class="rblock">              Masinter, L., Leach, P., Berners-Lee, <span class="insert">T., Lafon, Y., Ed.,</span></td><td class="lineno" valign="top"></td></tr>
407      <tr><td class="lineno" valign="top"></td><td class="lblock">              part 6: Caching", <span class="delete">draft-ietf-httpbis-p6-cache-00</span> (work in</td><td> </td><td class="rblock"><span class="insert">              and J. Reschke, Ed.,</span> "HTTP/1.1, part 6: Caching",</td><td class="lineno" valign="top"></td></tr>
408      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">December 2007.</span></td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p6-cache-01</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
409      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">              <span class="insert">January 2008.</span></td><td class="lineno" valign="top"></td></tr>
410      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
411      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate</span></td><td class="lineno" valign="top"></td></tr>
412      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">              Requirement Levels", BCP 14, RFC 2119, March 1997.</span></td><td class="lineno" valign="top"></td></tr>
413      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
414      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">10.2.  Informative References</span></td><td class="lineno" valign="top"></td></tr>
415      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
416      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC2068]  Fielding, R., Gettys, J., Mogul, J., Nielsen, H., and T.</td><td> </td><td class="right">   [RFC2068]  Fielding, R., Gettys, J., Mogul, J., Nielsen, H., and T.</td><td class="lineno" valign="top"></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="left">              Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1",</td><td> </td><td class="right">              Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1",</td><td class="lineno" valign="top"></td></tr>
418      <tr><td class="lineno" valign="top"></td><td class="left">              RFC 2068, January 1997.</td><td> </td><td class="right">              RFC 2068, January 1997.</td><td class="lineno" valign="top"></td></tr>
419      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
420      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC2616]  Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [RFC2616]  Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
421      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext</td><td> </td><td class="right">              Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext</td><td class="lineno" valign="top"></td></tr>
422      <tr><td class="lineno" valign="top"></td><td class="left">              Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.</td><td> </td><td class="right">              Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.</td><td class="lineno" valign="top"></td></tr>
423      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
424      <tr><td><a name="diff0026" /></td></tr>
425      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">Appendix A.  Compatibility with Previous Versions</span></td><td class="lineno" valign="top"></td></tr>
426      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
427      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">A.1.  Changes from RFC 2616</span></td><td class="lineno" valign="top"></td></tr>
428      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
429      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">Appendix B.  Change Log (to be removed by RFC Editor before publication)</span></td><td class="lineno" valign="top"></td></tr>
430      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
431      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">B.1.  Since RFC2616</span></td><td class="lineno" valign="top"></td></tr>
432      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
433      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Extracted relevant partitions from [RFC2616].</span></td><td class="lineno" valign="top"></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">B.2.  Since draft-ietf-httpbis-p4-conditional-00</span></td><td class="lineno" valign="top"></td></tr>
436      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
437      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Closed issues:</span></td><td class="lineno" valign="top"></td></tr>
438      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
439      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  &lt;http://www3.tools.ietf.org/wg/httpbis/trac/ticket/35&gt;: "Normative</span></td><td class="lineno" valign="top"></td></tr>
440      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      and Informative references"</span></td><td class="lineno" valign="top"></td></tr>
441      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
442      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Other changes:</span></td><td class="lineno" valign="top"></td></tr>
443      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
444      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  Move definitions of 304 and 412 condition codes from Part2.</span></td><td class="lineno" valign="top"></td></tr>
445      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
446      <tr><td class="lineno" valign="top"></td><td class="left">Index</td><td> </td><td class="right">Index</td><td class="lineno" valign="top"></td></tr>
447      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
448      <tr><td class="lineno" valign="top"></td><td class="left">   3</td><td> </td><td class="right">   3</td><td class="lineno" valign="top"></td></tr>
449      <tr><td><a name="diff0027" /></td></tr>
450      <tr><td class="lineno" valign="top"></td><td class="lblock">      304 Not Modified (status code)  <span class="delete">4</span></td><td> </td><td class="rblock">      304 Not Modified (status code)  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
451      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
452      <tr><td class="lineno" valign="top"></td><td class="left">   4</td><td> </td><td class="right">   4</td><td class="lineno" valign="top"></td></tr>
453      <tr><td><a name="diff0028" /></td></tr>
454      <tr><td class="lineno" valign="top"></td><td class="lblock">      412 Precondition Failed (status code)  <span class="delete">5</span></td><td> </td><td class="rblock">      412 Precondition Failed (status code)  <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
455      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
456      <tr><td class="lineno" valign="top"></td><td class="left">   E</td><td> </td><td class="right">   E</td><td class="lineno" valign="top"></td></tr>
457      <tr><td><a name="diff0029" /></td></tr>
458      <tr><td class="lineno" valign="top"></td><td class="lblock">      ETag header  1<span class="delete">0</span></td><td> </td><td class="rblock">      ETag header  1<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
459      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
460      <tr><td class="lineno" valign="top"></td><td class="left">   G</td><td> </td><td class="right">   G</td><td class="lineno" valign="top"></td></tr>
461      <tr><td class="lineno" valign="top"></td><td class="left">      Grammar</td><td> </td><td class="right">      Grammar</td><td class="lineno" valign="top"></td></tr>
462      <tr><td><a name="diff0030" /></td></tr>
463      <tr><td class="lineno" valign="top"></td><td class="lblock">         entity-tag  <span class="delete">4</span></td><td> </td><td class="rblock">         entity-tag  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
464      <tr><td class="lineno" valign="top"></td><td class="lblock">         ETag  <span class="delete">10</span></td><td> </td><td class="rblock">         ETag  <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
465      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Match  <span class="delete">10</span></td><td> </td><td class="rblock">         If-Match  <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
466      <tr><td class="lineno" valign="top"></td><td class="left">         If-Modified-Since  12</td><td> </td><td class="right">         If-Modified-Since  12</td><td class="lineno" valign="top"></td></tr>
467      <tr><td><a name="diff0031" /></td></tr>
468      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-None-Match  <span class="delete">13</span></td><td> </td><td class="rblock">         If-None-Match  14</td><td class="lineno" valign="top"></td></tr>
469      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         If-Unmodified-Since</span>  14</td><td> </td><td class="rblock">         <span class="insert">If-Unmodified-Since</span>  15</td><td class="lineno" valign="top"></td></tr>
470      <tr><td class="lineno" valign="top"></td><td class="lblock">         <span class="delete">Last-Modified</span>  15</td><td> </td><td class="rblock">         <span class="insert">Last-Modified  16</span></td><td class="lineno" valign="top"></td></tr>
471      <tr><td class="lineno" valign="top"></td><td class="lblock">         opaque-tag  <span class="delete">4</span></td><td> </td><td class="rblock">         opaque-tag  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
472      <tr><td class="lineno" valign="top"></td><td class="lblock">         weak  <span class="delete">4</span></td><td> </td><td class="rblock">         weak  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
473      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
474      <tr><td class="lineno" valign="top"></td><td class="left">   H</td><td> </td><td class="right">   H</td><td class="lineno" valign="top"></td></tr>
475      <tr><td class="lineno" valign="top"></td><td class="left">      Headers</td><td> </td><td class="right">      Headers</td><td class="lineno" valign="top"></td></tr>
476      <tr><td><a name="diff0032" /></td></tr>
477      <tr><td class="lineno" valign="top"></td><td class="lblock">         ETag  <span class="delete">10</span></td><td> </td><td class="rblock">         ETag  <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
478      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Match  <span class="delete">10</span></td><td> </td><td class="rblock">         If-Match  11</td><td class="lineno" valign="top"></td></tr>
479      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         If-Modified-Since</span>  11</td><td> </td><td class="rblock">         <span class="insert">If-Modified-Since  12</span></td><td class="lineno" valign="top"></td></tr>
480      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-None-Match  <span class="delete">13</span></td><td> </td><td class="rblock">         If-None-Match  14</td><td class="lineno" valign="top"></td></tr>
481      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         If-Unmodified-Since</span>  14</td><td> </td><td class="rblock">         <span class="insert">If-Unmodified-Since</span>  15</td><td class="lineno" valign="top"></td></tr>
482      <tr><td class="lineno" valign="top"></td><td class="lblock">         <span class="delete">Last-Modified</span>  15</td><td> </td><td class="rblock">         <span class="insert">Last-Modified  16</span></td><td class="lineno" valign="top"></td></tr>
483      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
484      <tr><td class="lineno" valign="top"></td><td class="left">   I</td><td> </td><td class="right">   I</td><td class="lineno" valign="top"></td></tr>
485      <tr><td><a name="diff0033" /></td></tr>
486      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-Match header  <span class="delete">10</span></td><td> </td><td class="rblock">      If-Match header  <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
487      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-Modified-Since header  <span class="delete">11</span></td><td> </td><td class="rblock">      If-Modified-Since header  <span class="insert">12</span></td><td class="lineno" valign="top"></td></tr>
488      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-None-Match header  <span class="delete">13</span></td><td> </td><td class="rblock">      If-None-Match header  <span class="insert">14</span></td><td class="lineno" valign="top"></td></tr>
489      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-Unmodified-Since header  <span class="delete">14</span></td><td> </td><td class="rblock">      If-Unmodified-Since header  <span class="insert">15</span></td><td class="lineno" valign="top"></td></tr>
490      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
491      <tr><td class="lineno" valign="top"></td><td class="left">   L</td><td> </td><td class="right">   L</td><td class="lineno" valign="top"></td></tr>
492      <tr><td><a name="diff0034" /></td></tr>
493      <tr><td class="lineno" valign="top"></td><td class="lblock">      Last-Modified header  1<span class="delete">5</span></td><td> </td><td class="rblock">      Last-Modified header  1<span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
494      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
495      <tr><td class="lineno" valign="top"></td><td class="left">   S</td><td> </td><td class="right">   S</td><td class="lineno" valign="top"></td></tr>
496      <tr><td class="lineno" valign="top"></td><td class="left">      Status Codes</td><td> </td><td class="right">      Status Codes</td><td class="lineno" valign="top"></td></tr>
497      <tr><td><a name="diff0035" /></td></tr>
498      <tr><td class="lineno" valign="top"></td><td class="lblock">         304 Not Modified  <span class="delete">4</span></td><td> </td><td class="rblock">         304 Not Modified  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
499      <tr><td class="lineno" valign="top"></td><td class="lblock">         412 Precondition Failed  <span class="delete">5</span></td><td> </td><td class="rblock">         412 Precondition Failed  <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
500      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
501      <tr><td class="lineno" valign="top"></td><td class="left">Authors' Addresses</td><td> </td><td class="right">Authors' Addresses</td><td class="lineno" valign="top"></td></tr>
502      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
503      <tr><td class="lineno" valign="top"></td><td class="left">   Roy T. Fielding (editor)</td><td> </td><td class="right">   Roy T. Fielding (editor)</td><td class="lineno" valign="top"></td></tr>
504      <tr><td class="lineno" valign="top"></td><td class="left">   Day Software</td><td> </td><td class="right">   Day Software</td><td class="lineno" valign="top"></td></tr>
505      <tr><td class="lineno" valign="top"></td><td class="left">   23 Corporate Plaza DR, Suite 280</td><td> </td><td class="right">   23 Corporate Plaza DR, Suite 280</td><td class="lineno" valign="top"></td></tr>
506      <tr><td class="lineno" valign="top"></td><td class="left">   Newport Beach, CA  92660</td><td> </td><td class="right">   Newport Beach, CA  92660</td><td class="lineno" valign="top"></td></tr>
507      <tr><td class="lineno" valign="top"></td><td class="left">   USA</td><td> </td><td class="right">   USA</td><td class="lineno" valign="top"></td></tr>
508      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
509      <tr><td class="lineno" valign="top"></td><td class="left">   Phone: +1-949-706-5300</td><td> </td><td class="right">   Phone: +1-949-706-5300</td><td class="lineno" valign="top"></td></tr>
510      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
511      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 20, line 4</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 21, line 4</em></th><td></td></tr>
512      <tr><td class="lineno" valign="top"></td><td class="left">   Tim Berners-Lee</td><td> </td><td class="right">   Tim Berners-Lee</td><td class="lineno" valign="top"></td></tr>
513      <tr><td class="lineno" valign="top"></td><td class="left">   World Wide Web Consortium</td><td> </td><td class="right">   World Wide Web Consortium</td><td class="lineno" valign="top"></td></tr>
514      <tr><td class="lineno" valign="top"></td><td class="left">   MIT Computer Science and Artificial Intelligence Laboratory</td><td> </td><td class="right">   MIT Computer Science and Artificial Intelligence Laboratory</td><td class="lineno" valign="top"></td></tr>
515      <tr><td class="lineno" valign="top"></td><td class="left">   The Stata Center, Building 32</td><td> </td><td class="right">   The Stata Center, Building 32</td><td class="lineno" valign="top"></td></tr>
516      <tr><td class="lineno" valign="top"></td><td class="left">   32 Vassar Street</td><td> </td><td class="right">   32 Vassar Street</td><td class="lineno" valign="top"></td></tr>
517      <tr><td class="lineno" valign="top"></td><td class="left">   Cambridge, MA  02139</td><td> </td><td class="right">   Cambridge, MA  02139</td><td class="lineno" valign="top"></td></tr>
518      <tr><td class="lineno" valign="top"></td><td class="left">   USA</td><td> </td><td class="right">   USA</td><td class="lineno" valign="top"></td></tr>
519      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
520      <tr><td class="lineno" valign="top"></td><td class="left">   Email: timbl@w3.org</td><td> </td><td class="right">   Email: timbl@w3.org</td><td class="lineno" valign="top"></td></tr>
521      <tr><td class="lineno" valign="top"></td><td class="left">   URI:   http://www.w3.org/People/Berners-Lee/</td><td> </td><td class="right">   URI:   http://www.w3.org/People/Berners-Lee/</td><td class="lineno" valign="top"></td></tr>
522      <tr><td><a name="diff0036" /></td></tr>
523      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">Yves Lafon (editor)</span></td><td class="lineno" valign="top"></td></tr>
524      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   World Wide Web Consortium</span></td><td class="lineno" valign="top"></td></tr>
525      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   W3C / ERCIM</span></td><td class="lineno" valign="top"></td></tr>
526      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   2004, rte des Lucioles</span></td><td class="lineno" valign="top"></td></tr>
527      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Sophia-Antipolis, AM  06902</span></td><td class="lineno" valign="top"></td></tr>
528      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   France</span></td><td class="lineno" valign="top"></td></tr>
529      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
530      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Email: ylafon@w3.org</span></td><td class="lineno" valign="top"></td></tr>
531      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   URI:   http://www.raubacapeu.net/people/yves/</span></td><td class="lineno" valign="top"></td></tr>
532      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
533      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Julian F. Reschke (editor)</span></td><td class="lineno" valign="top"></td></tr>
534      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   greenbytes GmbH</span></td><td class="lineno" valign="top"></td></tr>
535      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Hafenweg 16</span></td><td class="lineno" valign="top"></td></tr>
536      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Muenster, NW  48155</span></td><td class="lineno" valign="top"></td></tr>
537      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Germany</span></td><td class="lineno" valign="top"></td></tr>
538      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
539      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Phone: +49 251 2807760</span></td><td class="lineno" valign="top"></td></tr>
540      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Fax:   +49 251 2807761</span></td><td class="lineno" valign="top"></td></tr>
541      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Email: julian.reschke@greenbytes.de</span></td><td class="lineno" valign="top"></td></tr>
542      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   URI:   http://greenbytes.de/tech/webdav/</span></td><td class="lineno" valign="top"></td></tr>
543      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
544      <tr><td class="lineno" valign="top"></td><td class="left">Full Copyright Statement</td><td> </td><td class="right">Full Copyright Statement</td><td class="lineno" valign="top"></td></tr>
545      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
546      <tr><td><a name="diff0037" /></td></tr>
547      <tr><td class="lineno" valign="top"></td><td class="lblock">   Copyright (C) The IETF Trust (200<span class="delete">7</span>).</td><td> </td><td class="rblock">   Copyright (C) The IETF Trust (200<span class="insert">8</span>).</td><td class="lineno" valign="top"></td></tr>
548      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
549      <tr><td class="lineno" valign="top"></td><td class="left">   This document is subject to the rights, licenses and restrictions</td><td> </td><td class="right">   This document is subject to the rights, licenses and restrictions</td><td class="lineno" valign="top"></td></tr>
550      <tr><td class="lineno" valign="top"></td><td class="left">   contained in BCP 78, and except as set forth therein, the authors</td><td> </td><td class="right">   contained in BCP 78, and except as set forth therein, the authors</td><td class="lineno" valign="top"></td></tr>
551      <tr><td class="lineno" valign="top"></td><td class="left">   retain all their rights.</td><td> </td><td class="right">   retain all their rights.</td><td class="lineno" valign="top"></td></tr>
552      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
553      <tr><td class="lineno" valign="top"></td><td class="left">   This document and the information contained herein are provided on an</td><td> </td><td class="right">   This document and the information contained herein are provided on an</td><td class="lineno" valign="top"></td></tr>
554      <tr><td class="lineno" valign="top"></td><td class="left">   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS</td><td> </td><td class="right">   "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE REPRESENTS</td><td class="lineno" valign="top"></td></tr>
555      <tr><td class="lineno" valign="top"></td><td class="left">   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND</td><td> </td><td class="right">   OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY, THE IETF TRUST AND</td><td class="lineno" valign="top"></td></tr>
556      <tr><td class="lineno" valign="top"></td><td class="left">   THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS</td><td> </td><td class="right">   THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS</td><td class="lineno" valign="top"></td></tr>
557      <tr><td class="lineno" valign="top"></td><td class="left">   OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF</td><td> </td><td class="right">   OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF</td><td class="lineno" valign="top"></td></tr>
558
559     <tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
560     <tr bgcolor="gray"><th colspan="5" align="center"><a name="end">&nbsp;End of changes. 37 change blocks.&nbsp;</a></th></tr>
561     <tr class="stats"><td></td><th><i>93 lines changed or deleted</i></th><th><i> </i></th><th><i>179 lines changed or added</i></th><td></td></tr>
562     <tr><td colspan="5" align="center" class="small"><br/>This html diff was produced by rfcdiff 1.34. The latest version is available from <a href="http://www.tools.ietf.org/tools/rfcdiff/" >http://tools.ietf.org/tools/rfcdiff/</a> </td></tr>
563   </table>
564   </body>
565   </html>
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