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36<body > 
37  <table border="0" cellpadding="0" cellspacing="0"> 
38  <tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p4-conditional-18.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p4-conditional-19.txt&nbsp;</th><th></th></tr> 
39      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
40      <tr><td class="lineno" valign="top"></td><td class="left">HTTPbis Working Group                                   R. Fielding, Ed.</td><td> </td><td class="right">HTTPbis Working Group                                   R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
41      <tr><td class="lineno" valign="top"></td><td class="left">Internet-Draft                                                     Adobe</td><td> </td><td class="right">Internet-Draft                                                     Adobe</td><td class="lineno" valign="top"></td></tr>
42      <tr><td><a name="diff0001" /></td></tr>
43      <tr><td class="lineno" valign="top"></td><td class="lblock">Obsoletes: 2616 (if approved)                                  <span class="delete">J. Gettys</span></td><td> </td><td class="rblock">Obsoletes: 2616 (if approved)                              <span class="insert">Y. Lafon, Ed.</span></td><td class="lineno" valign="top"></td></tr>
44      <tr><td class="lineno" valign="top"></td><td class="lblock">Intended status: Standards Track                          <span class="delete">Alcatel-Lucent</span></td><td> </td><td class="rblock">Intended status: Standards Track                                     <span class="insert">W3C</span></td><td class="lineno" valign="top"></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">July 7,</span> 2012                                           <span class="delete">J. Mogul</span></td><td> </td><td class="rblock">Expires: <span class="insert">September 13,</span> 2012                              J. Reschke, Ed.</td><td class="lineno" valign="top"></td></tr>
46      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                      HP</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
47      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                              H. Frystyk</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
48      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                               Microsoft</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
49      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                             L. Masinter</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
50      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                   Adobe</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
51      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                P. Leach</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
52      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                               Microsoft</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
53      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                          T. Berners-Lee</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
54      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                 W3C/MIT</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
55      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                           Y. Lafon, Ed.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
56      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                     W3C</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
57      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                         J. Reschke, Ed.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
58      <tr><td class="lineno" valign="top"></td><td class="left">                                                              greenbytes</td><td> </td><td class="right">                                                              greenbytes</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">January 4</span>, 2012</td><td> </td><td class="rblock">                                                         <span class="insert"> March 12</span>, 2012</td><td class="lineno" valign="top"></td></tr>
61      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
62      <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>
63      <tr><td><a name="diff0003" /></td></tr>
64      <tr><td class="lineno" valign="top"></td><td class="lblock">                  draft-ietf-httpbis-p4-conditional-1<span class="delete">8</span></td><td> </td><td class="rblock">                  draft-ietf-httpbis-p4-conditional-1<span class="insert">9</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">Abstract</td><td> </td><td class="right">Abstract</td><td class="lineno" valign="top"></td></tr>
67      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
68      <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>
69      <tr><td class="lineno" valign="top"></td><td class="left">   protocol for distributed, collaborative, hypertext information</td><td> </td><td class="right">   protocol for distributed, collaborative, hypertext information</td><td class="lineno" valign="top"></td></tr>
70      <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>
71      <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>
72      <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>
73      <tr><td class="lineno" valign="top"></td><td class="left">   "HTTP/1.1" and, taken together, obsoletes RFC 2616.</td><td> </td><td class="right">   "HTTP/1.1" and, taken together, obsoletes RFC 2616.</td><td class="lineno" valign="top"></td></tr>
74      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
75      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
76      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 1, line 49</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 1, line 37</em></th><td></td></tr>
77      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
78      <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>
79      <tr><td class="lineno" valign="top"></td><td class="left">   group mailing list (ietf-http-wg@w3.org), which is archived at</td><td> </td><td class="right">   group mailing list (ietf-http-wg@w3.org), which is archived at</td><td class="lineno" valign="top"></td></tr>
80      <tr><td class="lineno" valign="top"></td><td class="left">   &lt;http://lists.w3.org/Archives/Public/ietf-http-wg/&gt;.</td><td> </td><td class="right">   &lt;http://lists.w3.org/Archives/Public/ietf-http-wg/&gt;.</td><td class="lineno" valign="top"></td></tr>
81      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
82      <tr><td class="lineno" valign="top"></td><td class="left">   The current issues list is at</td><td> </td><td class="right">   The current issues list is at</td><td class="lineno" valign="top"></td></tr>
83      <tr><td class="lineno" valign="top"></td><td class="left">   &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td> </td><td class="right">   &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td class="lineno" valign="top"></td></tr>
84      <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>
85      <tr><td class="lineno" valign="top"></td><td class="left">   &lt;http://tools.ietf.org/wg/httpbis/&gt;.</td><td> </td><td class="right">   &lt;http://tools.ietf.org/wg/httpbis/&gt;.</td><td class="lineno" valign="top"></td></tr>
86      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
87      <tr><td><a name="diff0004" /></td></tr>
88      <tr><td class="lineno" valign="top"></td><td class="lblock">   The changes in this draft are summarized in Appendix C.<span class="delete">19</span>.</td><td> </td><td class="rblock">   The changes in this draft are summarized in Appendix C.<span class="insert">20</span>.</td><td class="lineno" valign="top"></td></tr>
89      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
90      <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>
91      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
92      <tr><td class="lineno" valign="top"></td><td class="left">   This Internet-Draft is submitted in full conformance with the</td><td> </td><td class="right">   This Internet-Draft is submitted in full conformance with the</td><td class="lineno" valign="top"></td></tr>
93      <tr><td class="lineno" valign="top"></td><td class="left">   provisions of BCP 78 and BCP 79.</td><td> </td><td class="right">   provisions of BCP 78 and BCP 79.</td><td class="lineno" valign="top"></td></tr>
94      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
95      <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>
96      <tr><td class="lineno" valign="top"></td><td class="left">   Task Force (IETF).  Note that other groups may also distribute</td><td> </td><td class="right">   Task Force (IETF).  Note that other groups may also distribute</td><td class="lineno" valign="top"></td></tr>
97      <tr><td class="lineno" valign="top"></td><td class="left">   working documents as Internet-Drafts.  The list of current Internet-</td><td> </td><td class="right">   working documents as Internet-Drafts.  The list of current Internet-</td><td class="lineno" valign="top"></td></tr>
98      <tr><td class="lineno" valign="top"></td><td class="left">   Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td> </td><td class="right">   Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td class="lineno" valign="top"></td></tr>
99      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
100      <tr><td class="lineno" valign="top"></td><td class="left">   Internet-Drafts are draft documents valid for a maximum of six months</td><td> </td><td class="right">   Internet-Drafts are draft documents valid for a maximum of six months</td><td class="lineno" valign="top"></td></tr>
101      <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>
102      <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>
103      <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>
104      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
105      <tr><td><a name="diff0005" /></td></tr>
106      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on <span class="delete">July 7</span>, 2012.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">September 13</span>, 2012.</td><td class="lineno" valign="top"></td></tr>
107      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
108      <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>
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">   Copyright (c) 2012 IETF Trust and the persons identified as the</td><td> </td><td class="right">   Copyright (c) 2012 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
111      <tr><td class="lineno" valign="top"></td><td class="left">   document authors.  All rights reserved.</td><td> </td><td class="right">   document authors.  All rights reserved.</td><td class="lineno" valign="top"></td></tr>
112      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
113      <tr><td class="lineno" valign="top"></td><td class="left">   This document is subject to BCP 78 and the IETF Trust's Legal</td><td> </td><td class="right">   This document is subject to BCP 78 and the IETF Trust's Legal</td><td class="lineno" valign="top"></td></tr>
114      <tr><td class="lineno" valign="top"></td><td class="left">   Provisions Relating to IETF Documents</td><td> </td><td class="right">   Provisions Relating to IETF Documents</td><td class="lineno" valign="top"></td></tr>
115      <tr><td class="lineno" valign="top"></td><td class="left">   (http://trustee.ietf.org/license-info) in effect on the date of</td><td> </td><td class="right">   (http://trustee.ietf.org/license-info) in effect on the date of</td><td class="lineno" valign="top"></td></tr>
116      <tr><td class="lineno" valign="top"></td><td class="left">   publication of this document.  Please review these documents</td><td> </td><td class="right">   publication of this document.  Please review these documents</td><td class="lineno" valign="top"></td></tr>
117      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
118      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 2, line 51</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 2, line 39</em></th><td></td></tr>
119      <tr><td class="lineno" valign="top"></td><td class="left">   modifications of such material outside the IETF Standards Process.</td><td> </td><td class="right">   modifications of such material outside the IETF Standards Process.</td><td class="lineno" valign="top"></td></tr>
120      <tr><td class="lineno" valign="top"></td><td class="left">   Without obtaining an adequate license from the person(s) controlling</td><td> </td><td class="right">   Without obtaining an adequate license from the person(s) controlling</td><td class="lineno" valign="top"></td></tr>
121      <tr><td class="lineno" valign="top"></td><td class="left">   the copyright in such materials, this document may not be modified</td><td> </td><td class="right">   the copyright in such materials, this document may not be modified</td><td class="lineno" valign="top"></td></tr>
122      <tr><td class="lineno" valign="top"></td><td class="left">   outside the IETF Standards Process, and derivative works of it may</td><td> </td><td class="right">   outside the IETF Standards Process, and derivative works of it may</td><td class="lineno" valign="top"></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="left">   not be created outside the IETF Standards Process, except to format</td><td> </td><td class="right">   not be created outside the IETF Standards Process, except to format</td><td class="lineno" valign="top"></td></tr>
124      <tr><td class="lineno" valign="top"></td><td class="left">   it for publication as an RFC or to translate it into languages other</td><td> </td><td class="right">   it for publication as an RFC or to translate it into languages other</td><td class="lineno" valign="top"></td></tr>
125      <tr><td class="lineno" valign="top"></td><td class="left">   than English.</td><td> </td><td class="right">   than English.</td><td class="lineno" valign="top"></td></tr>
126      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
127      <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>
128      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
129      <tr><td><a name="diff0006" /></td></tr>
130      <tr><td class="lineno" valign="top"></td><td class="lblock">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  <span class="delete">5</span></td><td> </td><td class="rblock">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  <span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
131      <tr><td class="lineno" valign="top"></td><td class="lblock">     1.1.  Conformance and Error Handling . . . . . . . . . . . . . .  <span class="delete">5</span></td><td> </td><td class="rblock">     1.1.  Conformance and Error Handling . . . . . . . . . . . . . .  <span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="lblock">     1.2.  Syntax Notation  . . . . . . . . . . . . . . . . . . . . .  <span class="delete">6</span></td><td> </td><td class="rblock">     1.2.  Syntax Notation  . . . . . . . . . . . . . . . . . . . . .  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="lblock">   2.  Validators . . . . . . . . . . . . . . . . . . . . . . . . . .  <span class="delete">6</span></td><td> </td><td class="rblock">   2.  Validators . . . . . . . . . . . . . . . . . . . . . . . . . .  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
134      <tr><td class="lineno" valign="top"></td><td class="lblock">     2.1.  Weak versus Strong . . . . . . . . . . . . . . . . . . . .  <span class="delete">6</span></td><td> </td><td class="rblock">     2.1.  Weak versus Strong . . . . . . . . . . . . . . . . . . . .  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
135      <tr><td class="lineno" valign="top"></td><td class="lblock">     2.2.  Last-Modified  . . . . . . . . . . . . . . . . . . . . . .  <span class="delete">8</span></td><td> </td><td class="rblock">     2.2.  Last-Modified  . . . . . . . . . . . . . . . . . . . . . .  <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
136      <tr><td class="lineno" valign="top"></td><td class="lblock">       2.2.1.  Generation . . . . . . . . . . . . . . . . . . . . . .  <span class="delete">8</span></td><td> </td><td class="rblock">       2.2.1.  Generation . . . . . . . . . . . . . . . . . . . . . .  <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
137      <tr><td class="lineno" valign="top"></td><td class="lblock">       2.2.2.  Comparison . . . . . . . . . . . . . . . . . . . . . .  <span class="delete">9</span></td><td> </td><td class="rblock">       2.2.2.  Comparison . . . . . . . . . . . . . . . . . . . . . .  <span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
138      <tr><td class="lineno" valign="top"></td><td class="lblock">     2.3.  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">10</span></td><td> </td><td class="rblock">     2.3.  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . .  <span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
139      <tr><td class="lineno" valign="top"></td><td class="lblock">       2.3.1.  Generation . . . . . . . . . . . . . . . . . . . . . . <span class="delete">11</span></td><td> </td><td class="rblock">       2.3.1.  Generation . . . . . . . . . . . . . . . . . . . . . . <span class="insert">10</span></td><td class="lineno" valign="top"></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="lblock">       2.3.2.  Comparison . . . . . . . . . . . . . . . . . . . . . . <span class="delete">12</span></td><td> </td><td class="rblock">       2.3.2.  Comparison . . . . . . . . . . . . . . . . . . . . . . <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.3.  Example: Entity-tags varying on Content-Negotiated</td><td> </td><td class="right">       2.3.3.  Example: Entity-tags varying on Content-Negotiated</td><td class="lineno" valign="top"></td></tr>
142      <tr><td><a name="diff0007" /></td></tr>
143      <tr><td class="lineno" valign="top"></td><td class="lblock">               Resources  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">12</span></td><td> </td><td class="rblock">               Resources  . . . . . . . . . . . . . . . . . . . . . . <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
145      <tr><td class="lineno" valign="top"></td><td class="left">     2.4.  Rules for When to Use Entity-tags and Last-Modified</td><td> </td><td class="right">     2.4.  Rules for When to Use Entity-tags and Last-Modified</td><td class="lineno" valign="top"></td></tr>
146      <tr><td><a name="diff0008" /></td></tr>
147      <tr><td class="lineno" valign="top"></td><td class="lblock">           Dates  . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">13</span></td><td> </td><td class="rblock">           Dates  . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">12</span></td><td class="lineno" valign="top"></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="lblock">   3.  Precondition Header Fields . . . . . . . . . . . . . . . . . . <span class="delete">15</span></td><td> </td><td class="rblock">   3.  Precondition Header Fields . . . . . . . . . . . . . . . . . . <span class="insert">14</span></td><td class="lineno" valign="top"></td></tr>
149      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.1.  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">15</span></td><td> </td><td class="rblock">     3.1.  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">14</span></td><td class="lineno" valign="top"></td></tr>
150      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.2.  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">16</span></td><td> </td><td class="rblock">     3.2.  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . <span class="insert">15</span></td><td class="lineno" valign="top"></td></tr>
151      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.3.  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . <span class="delete">17</span></td><td> </td><td class="rblock">     3.3.  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . <span class="insert">16</span></td><td class="lineno" valign="top"></td></tr>
152      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.4.  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . <span class="delete">18</span></td><td> </td><td class="rblock">     3.4.  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
153      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.5.  If-Range . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock">     3.5.  If-Range . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
154      <tr><td class="lineno" valign="top"></td><td class="lblock">   4.  Status Code Definitions  . . . . . . . . . . . . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock">   4.  Status Code Definitions  . . . . . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="lblock">     4.1.  304 Not Modified . . . . . . . . . . . . . . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock">     4.1.  304 Not Modified . . . . . . . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
156      <tr><td class="lineno" valign="top"></td><td class="lblock">     4.2.  412 Precondition Failed  . . . . . . . . . . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock">     4.2.  412 Precondition Failed  . . . . . . . . . . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="lblock">   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock">   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno" valign="top"></td><td class="lblock">     5.1.  Status Code Registration . . . . . . . . . . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock">     5.1.  Status Code Registration . . . . . . . . . . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
159      <tr><td class="lineno" valign="top"></td><td class="lblock">     5.2.  Header Field Registration  . . . . . . . . . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock">     5.2.  Header Field Registration  . . . . . . . . . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
160      <tr><td class="lineno" valign="top"></td><td class="lblock">   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . <span class="delete">21</span></td><td> </td><td class="rblock">   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . <span class="insert">20</span></td><td class="lineno" valign="top"></td></tr>
161      <tr><td class="lineno" valign="top"></td><td class="lblock">   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">21</span></td><td> </td><td class="rblock">   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">20</span></td><td class="lineno" valign="top"></td></tr>
162      <tr><td class="lineno" valign="top"></td><td class="lblock">   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">21</span></td><td> </td><td class="rblock">   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">20</span></td><td class="lineno" valign="top"></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="lblock">     8.1.  Normative References . . . . . . . . . . . . . . . . . . . <span class="delete">21</span></td><td> </td><td class="rblock">     8.1.  Normative References . . . . . . . . . . . . . . . . . . . <span class="insert">20</span></td><td class="lineno" valign="top"></td></tr>
164      <tr><td class="lineno" valign="top"></td><td class="lblock">     8.2.  Informative References . . . . . . . . . . . . . . . . . . <span class="delete">22</span></td><td> </td><td class="rblock">     8.2.  Informative References . . . . . . . . . . . . . . . . . . <span class="insert">21</span></td><td class="lineno" valign="top"></td></tr>
165      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="delete">22</span></td><td> </td><td class="rblock">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="insert">21</span></td><td class="lineno" valign="top"></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . <span class="delete">23</span></td><td> </td><td class="rblock">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix C.  Change Log (to be removed by RFC Editor before</td><td> </td><td class="right">   Appendix C.  Change Log (to be removed by RFC Editor before</td><td class="lineno" valign="top"></td></tr>
168      <tr><td><a name="diff0009" /></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="lblock">                publication)  . . . . . . . . . . . . . . . . . . . . <span class="delete">23</span></td><td> </td><td class="rblock">                publication)  . . . . . . . . . . . . . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
170      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.1.  Since RFC 2616 . . . . . . . . . . . . . . . . . . . . . . <span class="delete">23</span></td><td> </td><td class="rblock">     C.1.  Since RFC 2616 . . . . . . . . . . . . . . . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.2.  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . <span class="delete">23</span></td><td> </td><td class="rblock">     C.2.  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.3.  Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . <span class="delete">24</span></td><td> </td><td class="rblock">     C.3.  Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . <span class="insert">23</span></td><td class="lineno" valign="top"></td></tr>
173      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.4.  Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . <span class="delete">24</span></td><td> </td><td class="rblock">     C.4.  Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . <span class="insert">23</span></td><td class="lineno" valign="top"></td></tr>
174      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.5.  Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . <span class="delete">24</span></td><td> </td><td class="rblock">     C.5.  Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . <span class="insert">23</span></td><td class="lineno" valign="top"></td></tr>
175      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.6.  Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . <span class="delete">24</span></td><td> </td><td class="rblock">     C.6.  Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . <span class="insert">23</span></td><td class="lineno" valign="top"></td></tr>
176      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.7.  Since draft-ietf-httpbis-p4-conditional-05 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.7.  Since draft-ietf-httpbis-p4-conditional-05 . . . . . . . . <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
177      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.8.  Since draft-ietf-httpbis-p4-conditional-06 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.8.  Since draft-ietf-httpbis-p4-conditional-06 . . . . . . . . <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.9.  Since draft-ietf-httpbis-p4-conditional-07 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.9.  Since draft-ietf-httpbis-p4-conditional-07 . . . . . . . . <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
179      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.10. Since draft-ietf-httpbis-p4-conditional-08 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.10. Since draft-ietf-httpbis-p4-conditional-08 . . . . . . . . <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
180      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.11. Since draft-ietf-httpbis-p4-conditional-09 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.11. Since draft-ietf-httpbis-p4-conditional-09 . . . . . . . . <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
181      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.12. Since draft-ietf-httpbis-p4-conditional-10 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.12. Since draft-ietf-httpbis-p4-conditional-10 . . . . . . . . <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.13. Since draft-ietf-httpbis-p4-conditional-11 . . . . . . . . <span class="delete">26</span></td><td> </td><td class="rblock">     C.13. Since draft-ietf-httpbis-p4-conditional-11 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
183      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.14. Since draft-ietf-httpbis-p4-conditional-12 . . . . . . . . <span class="delete">26</span></td><td> </td><td class="rblock">     C.14. Since draft-ietf-httpbis-p4-conditional-12 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
184      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.15. Since draft-ietf-httpbis-p4-conditional-13 . . . . . . . . <span class="delete">26</span></td><td> </td><td class="rblock">     C.15. Since draft-ietf-httpbis-p4-conditional-13 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.16. Since draft-ietf-httpbis-p4-conditional-14 . . . . . . . . <span class="delete">26</span></td><td> </td><td class="rblock">     C.16. Since draft-ietf-httpbis-p4-conditional-14 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.17. Since draft-ietf-httpbis-p4-conditional-15 . . . . . . . . <span class="delete">26</span></td><td> </td><td class="rblock">     C.17. Since draft-ietf-httpbis-p4-conditional-15 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
187      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.18. Since draft-ietf-httpbis-p4-conditional-16 . . . . . . . . <span class="delete">26</span></td><td> </td><td class="rblock">     C.18. Since draft-ietf-httpbis-p4-conditional-16 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
188      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.19. Since draft-ietf-httpbis-p4-conditional-17 . . . . . . . . <span class="delete">27</span></td><td> </td><td class="rblock">     C.19. Since draft-ietf-httpbis-p4-conditional-17 . . . . . . . . <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
189      <tr><td class="lineno" valign="top"></td><td class="lblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">27</span></td><td> </td><td class="rblock"><span class="insert">     C.20. Since draft-ietf-httpbis-p4-conditional-18 . . . . . . . . 26</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">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
191      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
192      <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>
193      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
194      <tr><td class="lineno" valign="top"></td><td class="left">   This document defines the HTTP/1.1 conditional request mechanisms,</td><td> </td><td class="right">   This document defines the HTTP/1.1 conditional request mechanisms,</td><td class="lineno" valign="top"></td></tr>
195      <tr><td class="lineno" valign="top"></td><td class="left">   including both metadata for indicating/observing changes in resource</td><td> </td><td class="right">   including both metadata for indicating/observing changes in resource</td><td class="lineno" valign="top"></td></tr>
196      <tr><td class="lineno" valign="top"></td><td class="left">   representations and request header fields that specify preconditions</td><td> </td><td class="right">   representations and request header fields that specify preconditions</td><td class="lineno" valign="top"></td></tr>
197      <tr><td class="lineno" valign="top"></td><td class="left">   on that metadata be checked before performing the request method.</td><td> </td><td class="right">   on that metadata be checked before performing the request method.</td><td class="lineno" valign="top"></td></tr>
198      <tr><td class="lineno" valign="top"></td><td class="left">   Conditional GET requests are the most efficient mechanism for HTTP</td><td> </td><td class="right">   Conditional GET requests are the most efficient mechanism for HTTP</td><td class="lineno" valign="top"></td></tr>
199      <tr><td class="lineno" valign="top"></td><td class="left">   cache updates [Part6].  Conditionals can also be applied to state-</td><td> </td><td class="right">   cache updates [Part6].  Conditionals can also be applied to state-</td><td class="lineno" valign="top"></td></tr>
200      <tr><td class="lineno" valign="top"></td><td class="left">   changing methods, such as PUT and DELETE, to prevent the "lost</td><td> </td><td class="right">   changing methods, such as PUT and DELETE, to prevent the "lost</td><td class="lineno" valign="top"></td></tr>
201      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
202      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 6, line 19</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 5, line 19</em></th><td></td></tr>
203      <tr><td class="lineno" valign="top"></td><td class="left">   define specific error handling mechanisms, except in cases where it</td><td> </td><td class="right">   define specific error handling mechanisms, except in cases where it</td><td class="lineno" valign="top"></td></tr>
204      <tr><td class="lineno" valign="top"></td><td class="left">   has direct impact on security.  This is because different uses of the</td><td> </td><td class="right">   has direct impact on security.  This is because different uses of the</td><td class="lineno" valign="top"></td></tr>
205      <tr><td class="lineno" valign="top"></td><td class="left">   protocol require different error handling strategies; for example, a</td><td> </td><td class="right">   protocol require different error handling strategies; for example, a</td><td class="lineno" valign="top"></td></tr>
206      <tr><td class="lineno" valign="top"></td><td class="left">   Web browser may wish to transparently recover from a response where</td><td> </td><td class="right">   Web browser may wish to transparently recover from a response where</td><td class="lineno" valign="top"></td></tr>
207      <tr><td class="lineno" valign="top"></td><td class="left">   the Location header field doesn't parse according to the ABNF,</td><td> </td><td class="right">   the Location header field doesn't parse according to the ABNF,</td><td class="lineno" valign="top"></td></tr>
208      <tr><td class="lineno" valign="top"></td><td class="left">   whereby in a systems control protocol using HTTP, this type of error</td><td> </td><td class="right">   whereby in a systems control protocol using HTTP, this type of error</td><td class="lineno" valign="top"></td></tr>
209      <tr><td class="lineno" valign="top"></td><td class="left">   recovery could lead to dangerous consequences.</td><td> </td><td class="right">   recovery could lead to dangerous consequences.</td><td class="lineno" valign="top"></td></tr>
210      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
211      <tr><td class="lineno" valign="top"></td><td class="left">1.2.  Syntax Notation</td><td> </td><td class="right">1.2.  Syntax Notation</td><td class="lineno" valign="top"></td></tr>
212      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
213      <tr><td><a name="diff0010" /></td></tr>
214      <tr><td class="lineno" valign="top"></td><td class="lblock">   This specification uses the <span class="delete">ABNF syntax</span> defined in Section 1.2 of</td><td> </td><td class="rblock">   This specification uses the <span class="insert">Augmented Backus-Naur Form (ABNF)</span></td><td class="lineno" valign="top"></td></tr>
215      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[Part1] (which extends the syntax defined in [RFC5234] with a list</span></td><td> </td><td class="rblock"><span class="insert">   notation of [RFC5234] with the list rule extension</span> defined in Section</td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   rule).</span>  Appendix B shows the collected <span class="delete">ABNF,</span> with the list rule</td><td> </td><td class="rblock">   1.2 of <span class="insert">[Part1].</span>  Appendix B shows the collected <span class="insert">ABNF</span> with the list</td><td class="lineno" valign="top"></td></tr>
217      <tr><td class="lineno" valign="top"></td><td class="lblock">   expanded.</td><td> </td><td class="rblock">   rule expanded.</td><td class="lineno" valign="top"></td></tr>
218      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
219      <tr><td class="lineno" valign="top"></td><td class="left">   The following core rules are included by reference, as defined in</td><td> </td><td class="right">   The following core rules are included by reference, as defined in</td><td class="lineno" valign="top"></td></tr>
220      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC5234], Appendix B.1: ALPHA (letters), CR (carriage return), CRLF</td><td> </td><td class="right">   [RFC5234], Appendix B.1: ALPHA (letters), CR (carriage return), CRLF</td><td class="lineno" valign="top"></td></tr>
221      <tr><td class="lineno" valign="top"></td><td class="left">   (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote),</td><td> </td><td class="right">   (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote),</td><td class="lineno" valign="top"></td></tr>
222      <tr><td class="lineno" valign="top"></td><td class="left">   HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit</td><td> </td><td class="right">   HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit</td><td class="lineno" valign="top"></td></tr>
223      <tr><td class="lineno" valign="top"></td><td class="left">   sequence of data), SP (space), and VCHAR (any visible US-ASCII</td><td> </td><td class="right">   sequence of data), SP (space), and VCHAR (any visible US-ASCII</td><td class="lineno" valign="top"></td></tr>
224      <tr><td class="lineno" valign="top"></td><td class="left">   character).</td><td> </td><td class="right">   character).</td><td class="lineno" valign="top"></td></tr>
225      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
226      <tr><td class="lineno" valign="top"></td><td class="left">   The ABNF rules below are defined in [Part1] and [Part2]:</td><td> </td><td class="right">   The ABNF rules below are defined in [Part1] and [Part2]:</td><td class="lineno" valign="top"></td></tr>
227      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
228      <tr><td><a name="diff0011" /></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="lblock">     OWS           = &lt;OWS, defined in [Part1], Section <span class="delete">1.2.2&gt;</span></td><td> </td><td class="rblock">     OWS           = &lt;OWS, defined in [Part1], Section <span class="insert">3.2.1&gt;</span></td><td class="lineno" valign="top"></td></tr>
230      <tr><td class="lineno" valign="top"></td><td class="lblock">     obs-text      = &lt;obs-text, defined in [Part1], Section <span class="delete">3.2.3&gt;</span></td><td> </td><td class="rblock">     obs-text      = &lt;obs-text, defined in [Part1], Section <span class="insert">3.2.4&gt;</span></td><td class="lineno" valign="top"></td></tr>
231      <tr><td class="lineno" valign="top"></td><td class="left">     HTTP-date     = &lt;HTTP-date, defined in [Part2], Section 8&gt;</td><td> </td><td class="right">     HTTP-date     = &lt;HTTP-date, defined in [Part2], Section 8&gt;</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">2.  Validators</td><td> </td><td class="right">2.  Validators</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">   This specification defines two forms of metadata that are commonly</td><td> </td><td class="right">   This specification defines two forms of metadata that are commonly</td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="left">   used to observe resource state and test for preconditions:</td><td> </td><td class="right">   used to observe resource state and test for preconditions:</td><td class="lineno" valign="top"></td></tr>
237      <tr><td class="lineno" valign="top"></td><td class="left">   modification dates and opaque entity tags.  Additional metadata that</td><td> </td><td class="right">   modification dates and opaque entity tags.  Additional metadata that</td><td class="lineno" valign="top"></td></tr>
238      <tr><td class="lineno" valign="top"></td><td class="left">   reflects resource state has been defined by various extensions of</td><td> </td><td class="right">   reflects resource state has been defined by various extensions of</td><td class="lineno" valign="top"></td></tr>
239      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP, such as WebDAV [RFC4918], that are beyond the scope of this</td><td> </td><td class="right">   HTTP, such as WebDAV [RFC4918], that are beyond the scope of this</td><td class="lineno" valign="top"></td></tr>
240      <tr><td class="lineno" valign="top"></td><td class="left">   specification.  A resource metadata value is referred to as a</td><td> </td><td class="right">   specification.  A resource metadata value is referred to as a</td><td class="lineno" valign="top"></td></tr>
241      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
242      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 13, line 39</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 12, line 39</em></th><td></td></tr>
243      <tr><td class="lineno" valign="top"></td><td class="left">     Vary: Accept-Encoding</td><td> </td><td class="right">     Vary: Accept-Encoding</td><td class="lineno" valign="top"></td></tr>
244      <tr><td class="lineno" valign="top"></td><td class="left">     Content-Type: text/plain</td><td> </td><td class="right">     Content-Type: text/plain</td><td class="lineno" valign="top"></td></tr>
245      <tr><td class="lineno" valign="top"></td><td class="left">     Content-Encoding: gzip</td><td> </td><td class="right">     Content-Encoding: gzip</td><td class="lineno" valign="top"></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left">     ...binary data...</td><td> </td><td class="right">     ...binary data...</td><td class="lineno" valign="top"></td></tr>
248      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="left">      Note: Content codings are a property of the representation, so</td><td> </td><td class="right">      Note: Content codings are a property of the representation, so</td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="left">      therefore an entity-tag of an encoded representation must be</td><td> </td><td class="right">      therefore an entity-tag of an encoded representation must be</td><td class="lineno" valign="top"></td></tr>
251      <tr><td class="lineno" valign="top"></td><td class="left">      distinct from an unencoded representation to prevent conflicts</td><td> </td><td class="right">      distinct from an unencoded representation to prevent conflicts</td><td class="lineno" valign="top"></td></tr>
252      <tr><td class="lineno" valign="top"></td><td class="left">      during cache updates and range requests.  In contrast, transfer</td><td> </td><td class="right">      during cache updates and range requests.  In contrast, transfer</td><td class="lineno" valign="top"></td></tr>
253      <tr><td><a name="diff0012" /></td></tr>
254      <tr><td class="lineno" valign="top"></td><td class="lblock">      codings (Section <span class="delete">5.1</span> of [Part1]) apply only during message</td><td> </td><td class="rblock">      codings (Section <span class="insert">4</span> of [Part1]) apply only during message transfer</td><td class="lineno" valign="top"></td></tr>
255      <tr><td class="lineno" valign="top"></td><td class="lblock">      transfer and do not require distinct entity-tags.</td><td> </td><td class="rblock">      and do not require distinct entity-tags.</td><td class="lineno" valign="top"></td></tr>
256      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
257      <tr><td class="lineno" valign="top"></td><td class="left">2.4.  Rules for When to Use Entity-tags and Last-Modified Dates</td><td> </td><td class="right">2.4.  Rules for When to Use Entity-tags and Last-Modified Dates</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">   We adopt a set of rules and recommendations for origin servers,</td><td> </td><td class="right">   We adopt a set of rules and recommendations for origin servers,</td><td class="lineno" valign="top"></td></tr>
260      <tr><td class="lineno" valign="top"></td><td class="left">   clients, and caches regarding when various validator types ought to</td><td> </td><td class="right">   clients, and caches regarding when various validator types ought to</td><td class="lineno" valign="top"></td></tr>
261      <tr><td class="lineno" valign="top"></td><td class="left">   be used, and for what purposes.</td><td> </td><td class="right">   be used, and for what purposes.</td><td class="lineno" valign="top"></td></tr>
262      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
263      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP/1.1 origin servers:</td><td> </td><td class="right">   HTTP/1.1 origin servers:</td><td class="lineno" valign="top"></td></tr>
264      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="left">   o  SHOULD send an entity-tag validator unless it is not feasible to</td><td> </td><td class="right">   o  SHOULD send an entity-tag validator unless it is not feasible to</td><td class="lineno" valign="top"></td></tr>
266      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
267      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 16, line 6</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 15, line 6</em></th><td></td></tr>
268      <tr><td class="lineno" valign="top"></td><td class="left">   anything other than a 2xx or 412 status code, then the If-Match</td><td> </td><td class="right">   anything other than a 2xx or 412 status code, then the If-Match</td><td class="lineno" valign="top"></td></tr>
269      <tr><td class="lineno" valign="top"></td><td class="left">   header field MUST be ignored.</td><td> </td><td class="right">   header field MUST be ignored.</td><td class="lineno" valign="top"></td></tr>
270      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
271      <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>
272      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
273      <tr><td class="lineno" valign="top"></td><td class="left">     If-Match: "xyzzy"</td><td> </td><td class="right">     If-Match: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
274      <tr><td class="lineno" valign="top"></td><td class="left">     If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td> </td><td class="right">     If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td class="lineno" valign="top"></td></tr>
275      <tr><td class="lineno" valign="top"></td><td class="left">     If-Match: *</td><td> </td><td class="right">     If-Match: *</td><td class="lineno" valign="top"></td></tr>
276      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
277      <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>
278      <tr><td><a name="diff0013" /></td></tr>
279      <tr><td class="lineno" valign="top"></td><td class="lblock">   either an If-None-Match or an If-Modified-Since header field<span class="delete">s</span> is</td><td> </td><td class="rblock">   either an If-None-Match or an If-Modified-Since header field is</td><td class="lineno" valign="top"></td></tr>
280      <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>
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">3.2.  If-None-Match</td><td> </td><td class="right">3.2.  If-None-Match</td><td class="lineno" valign="top"></td></tr>
283      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
284      <tr><td class="lineno" valign="top"></td><td class="left">   The "If-None-Match" header field MAY be used to make a request method</td><td> </td><td class="right">   The "If-None-Match" header field MAY be used to make a request method</td><td class="lineno" valign="top"></td></tr>
285      <tr><td class="lineno" valign="top"></td><td class="left">   conditional on not matching any of the current entity-tag values for</td><td> </td><td class="right">   conditional on not matching any of the current entity-tag values for</td><td class="lineno" valign="top"></td></tr>
286      <tr><td class="lineno" valign="top"></td><td class="left">   representations of the target resource.  If-None-Match is primarily</td><td> </td><td class="right">   representations of the target resource.  If-None-Match is primarily</td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="left">   used in conditional GET requests to enable efficient updates of</td><td> </td><td class="right">   used in conditional GET requests to enable efficient updates of</td><td class="lineno" valign="top"></td></tr>
288      <tr><td class="lineno" valign="top"></td><td class="left">   cached information with a minimum amount of transaction overhead.  A</td><td> </td><td class="right">   cached information with a minimum amount of transaction overhead.  A</td><td class="lineno" valign="top"></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="left">   client that has one or more representations previously obtained from</td><td> </td><td class="right">   client that has one or more representations previously obtained from</td><td class="lineno" valign="top"></td></tr>
290      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
291      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 17, line 15</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 16, line 15</em></th><td></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">   Examples:</td><td> </td><td class="right">   Examples:</td><td class="lineno" valign="top"></td></tr>
294      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
295      <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>
296      <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>
297      <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>
298      <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>
299      <tr><td class="lineno" valign="top"></td><td class="left">     If-None-Match: *</td><td> </td><td class="right">     If-None-Match: *</td><td class="lineno" valign="top"></td></tr>
300      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
301      <tr><td class="lineno" valign="top"></td><td class="left">   The result of a request having both an If-None-Match header field and</td><td> </td><td class="right">   The result of a request having both an If-None-Match header field and</td><td class="lineno" valign="top"></td></tr>
302      <tr><td><a name="diff0014" /></td></tr>
303      <tr><td class="lineno" valign="top"></td><td class="lblock">   either an If-Match or an If-Unmodified-Since header field<span class="delete">s</span> is</td><td> </td><td class="rblock">   either an If-Match or an If-Unmodified-Since header field is</td><td class="lineno" valign="top"></td></tr>
304      <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>
305      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
306      <tr><td class="lineno" valign="top"></td><td class="left">3.3.  If-Modified-Since</td><td> </td><td class="right">3.3.  If-Modified-Since</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 "If-Modified-Since" header field MAY be used to make a request</td><td> </td><td class="right">   The "If-Modified-Since" header field MAY be used to make a request</td><td class="lineno" valign="top"></td></tr>
309      <tr><td class="lineno" valign="top"></td><td class="left">   method conditional by modification date: if the selected</td><td> </td><td class="right">   method conditional by modification date: if the selected</td><td class="lineno" valign="top"></td></tr>
310      <tr><td class="lineno" valign="top"></td><td class="left">   representation has not been modified since the time specified in this</td><td> </td><td class="right">   representation has not been modified since the time specified in this</td><td class="lineno" valign="top"></td></tr>
311      <tr><td class="lineno" valign="top"></td><td class="left">   field, then do not perform the request method; instead, respond as</td><td> </td><td class="right">   field, then do not perform the request method; instead, respond as</td><td class="lineno" valign="top"></td></tr>
312      <tr><td class="lineno" valign="top"></td><td class="left">   detailed below.</td><td> </td><td class="right">   detailed below.</td><td class="lineno" valign="top"></td></tr>
313      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
314      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
315      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 18, line 35</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 17, line 35</em></th><td></td></tr>
316      <tr><td class="lineno" valign="top"></td><td class="left">      encodings of time between the client and server, are concerns.</td><td> </td><td class="right">      encodings of time between the client and server, are concerns.</td><td class="lineno" valign="top"></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="left">      This includes the possibility of race conditions if the document</td><td> </td><td class="right">      This includes the possibility of race conditions if the document</td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="left">      has changed between the time it was first requested and the If-</td><td> </td><td class="right">      has changed between the time it was first requested and the If-</td><td class="lineno" valign="top"></td></tr>
319      <tr><td class="lineno" valign="top"></td><td class="left">      Modified-Since date of a subsequent request, and the possibility</td><td> </td><td class="right">      Modified-Since date of a subsequent request, and the possibility</td><td class="lineno" valign="top"></td></tr>
320      <tr><td class="lineno" valign="top"></td><td class="left">      of clock-skew-related problems if the If-Modified-Since date is</td><td> </td><td class="right">      of clock-skew-related problems if the If-Modified-Since date is</td><td class="lineno" valign="top"></td></tr>
321      <tr><td class="lineno" valign="top"></td><td class="left">      derived from the client's clock without correction to the server's</td><td> </td><td class="right">      derived from the client's clock without correction to the server's</td><td class="lineno" valign="top"></td></tr>
322      <tr><td class="lineno" valign="top"></td><td class="left">      clock.  Corrections for different time bases between client and</td><td> </td><td class="right">      clock.  Corrections for different time bases between client and</td><td class="lineno" valign="top"></td></tr>
323      <tr><td class="lineno" valign="top"></td><td class="left">      server are at best approximate due to network latency.</td><td> </td><td class="right">      server are at best approximate due to network latency.</td><td class="lineno" valign="top"></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-Modified-Since header field</td><td> </td><td class="right">   The result of a request having both an If-Modified-Since header field</td><td class="lineno" valign="top"></td></tr>
326      <tr><td><a name="diff0015" /></td></tr>
327      <tr><td class="lineno" valign="top"></td><td class="lblock">   and either an If-Match or an If-Unmodified-Since header field<span class="delete">s</span> is</td><td> </td><td class="rblock">   and either an If-Match or an If-Unmodified-Since header field is</td><td class="lineno" valign="top"></td></tr>
328      <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>
329      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="left">3.4.  If-Unmodified-Since</td><td> </td><td class="right">3.4.  If-Unmodified-Since</td><td class="lineno" valign="top"></td></tr>
331      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
332      <tr><td class="lineno" valign="top"></td><td class="left">   The "If-Unmodified-Since" header field MAY be used to make a request</td><td> </td><td class="right">   The "If-Unmodified-Since" header field MAY be used to make a request</td><td class="lineno" valign="top"></td></tr>
333      <tr><td class="lineno" valign="top"></td><td class="left">   method conditional by modification date: if the selected</td><td> </td><td class="right">   method conditional by modification date: if the selected</td><td class="lineno" valign="top"></td></tr>
334      <tr><td class="lineno" valign="top"></td><td class="left">   representation has been modified since the time specified in this</td><td> </td><td class="right">   representation has been modified since the time specified in this</td><td class="lineno" valign="top"></td></tr>
335      <tr><td class="lineno" valign="top"></td><td class="left">   field, then the server MUST NOT perform the requested operation and</td><td> </td><td class="right">   field, then the server MUST NOT perform the requested operation and</td><td class="lineno" valign="top"></td></tr>
336      <tr><td class="lineno" valign="top"></td><td class="left">   MUST instead respond with the 412 (Precondition Failed) status code.</td><td> </td><td class="right">   MUST instead respond with the 412 (Precondition Failed) status code.</td><td class="lineno" valign="top"></td></tr>
337      <tr><td class="lineno" valign="top"></td><td class="left">   If the selected representation has not been modified since the time</td><td> </td><td class="right">   If the selected representation has not been modified since the time</td><td class="lineno" valign="top"></td></tr>
338      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
339      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 19, line 15</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 18, line 15</em></th><td></td></tr>
340      <tr><td class="lineno" valign="top"></td><td class="left">     If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT</td><td> </td><td class="right">     If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT</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 the request normally (i.e., without the If-Unmodified-Since header</td><td> </td><td class="right">   If the request normally (i.e., without the If-Unmodified-Since header</td><td class="lineno" valign="top"></td></tr>
343      <tr><td class="lineno" valign="top"></td><td class="left">   field) would result in anything other than a 2xx or 412 status code,</td><td> </td><td class="right">   field) would result in anything other than a 2xx or 412 status code,</td><td class="lineno" valign="top"></td></tr>
344      <tr><td class="lineno" valign="top"></td><td class="left">   the If-Unmodified-Since header field SHOULD be ignored.</td><td> </td><td class="right">   the If-Unmodified-Since header field SHOULD be ignored.</td><td class="lineno" valign="top"></td></tr>
345      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
346      <tr><td class="lineno" valign="top"></td><td class="left">   If the specified date is invalid, the header field MUST be ignored.</td><td> </td><td class="right">   If the specified date is invalid, the header field MUST be ignored.</td><td class="lineno" valign="top"></td></tr>
347      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="left">   The result of a request having both an If-Unmodified-Since header</td><td> </td><td class="right">   The result of a request having both an If-Unmodified-Since header</td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left">   field and either an If-None-Match or an If-Modified-Since header</td><td> </td><td class="right">   field and either an If-None-Match or an If-Modified-Since header</td><td class="lineno" valign="top"></td></tr>
350      <tr><td><a name="diff0016" /></td></tr>
351      <tr><td class="lineno" valign="top"></td><td class="lblock">   field<span class="delete">s</span> is undefined by this specification.</td><td> </td><td class="rblock">   field is undefined by this specification.</td><td class="lineno" valign="top"></td></tr>
352      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
353      <tr><td class="lineno" valign="top"></td><td class="left">3.5.  If-Range</td><td> </td><td class="right">3.5.  If-Range</td><td class="lineno" valign="top"></td></tr>
354      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
355      <tr><td class="lineno" valign="top"></td><td class="left">   The If-Range header field provides a special conditional request</td><td> </td><td class="right">   The If-Range header field provides a special conditional request</td><td class="lineno" valign="top"></td></tr>
356      <tr><td class="lineno" valign="top"></td><td class="left">   mechanism that is similar to If-Match and If-Unmodified-Since but</td><td> </td><td class="right">   mechanism that is similar to If-Match and If-Unmodified-Since but</td><td class="lineno" valign="top"></td></tr>
357      <tr><td class="lineno" valign="top"></td><td class="left">   specific to HTTP range requests.  If-Range is defined in Section 5.3</td><td> </td><td class="right">   specific to HTTP range requests.  If-Range is defined in Section 5.3</td><td class="lineno" valign="top"></td></tr>
358      <tr><td class="lineno" valign="top"></td><td class="left">   of [Part5].</td><td> </td><td class="right">   of [Part5].</td><td class="lineno" valign="top"></td></tr>
359      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
360      <tr><td class="lineno" valign="top"></td><td class="left">4.  Status Code Definitions</td><td> </td><td class="right">4.  Status Code Definitions</td><td class="lineno" valign="top"></td></tr>
361      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
362      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
363      <tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 19, line 39</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 18, line 39</em></th><td></td></tr>
364      <tr><td class="lineno" valign="top"></td><td class="left">   received and would have resulted in a 200 (OK) response if it were</td><td> </td><td class="right">   received and would have resulted in a 200 (OK) response if it were</td><td class="lineno" valign="top"></td></tr>
365      <tr><td class="lineno" valign="top"></td><td class="left">   not for the fact that the condition has evaluated to false.  In other</td><td> </td><td class="right">   not for the fact that the condition has evaluated to false.  In other</td><td class="lineno" valign="top"></td></tr>
366      <tr><td class="lineno" valign="top"></td><td class="left">   words, there is no need for the server to transfer a representation</td><td> </td><td class="right">   words, there is no need for the server to transfer a representation</td><td class="lineno" valign="top"></td></tr>
367      <tr><td class="lineno" valign="top"></td><td class="left">   of the target resource because the client's request indicates that it</td><td> </td><td class="right">   of the target resource because the client's request indicates that it</td><td class="lineno" valign="top"></td></tr>
368      <tr><td class="lineno" valign="top"></td><td class="left">   already has a valid representation, as indicated by the 304 response</td><td> </td><td class="right">   already has a valid representation, as indicated by the 304 response</td><td class="lineno" valign="top"></td></tr>
369      <tr><td class="lineno" valign="top"></td><td class="left">   header fields, and is therefore redirecting the client to make use of</td><td> </td><td class="right">   header fields, and is therefore redirecting the client to make use of</td><td class="lineno" valign="top"></td></tr>
370      <tr><td class="lineno" valign="top"></td><td class="left">   that stored representation as if it were the payload of a 200</td><td> </td><td class="right">   that stored representation as if it were the payload of a 200</td><td class="lineno" valign="top"></td></tr>
371      <tr><td class="lineno" valign="top"></td><td class="left">   response.  The 304 response MUST NOT contain a message-body, and thus</td><td> </td><td class="right">   response.  The 304 response MUST NOT contain a message-body, and thus</td><td class="lineno" valign="top"></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="left">   is always terminated by the first empty line after the header fields.</td><td> </td><td class="right">   is always terminated by the first empty line after the header fields.</td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
374      <tr><td><a name="diff0017" /></td></tr>
375      <tr><td class="lineno" valign="top"></td><td class="lblock">   A 304 response MUST include a Date header field (Section <span class="delete">9</span>.2 of</td><td> </td><td class="rblock">   A 304 response MUST include a Date header field (Section <span class="insert">10</span>.2 of</td><td class="lineno" valign="top"></td></tr>
376      <tr><td class="lineno" valign="top"></td><td class="left">   [Part2]) unless the origin server does not have a clock that can</td><td> </td><td class="right">   [Part2]) unless the origin server does not have a clock that can</td><td class="lineno" valign="top"></td></tr>
377      <tr><td class="lineno" valign="top"></td><td class="left">   provide a reasonable approximation of the current time.  If a 200</td><td> </td><td class="right">   provide a reasonable approximation of the current time.  If a 200</td><td class="lineno" valign="top"></td></tr>
378      <tr><td class="lineno" valign="top"></td><td class="left">   response to the same request would have included any of the header</td><td> </td><td class="right">   response to the same request would have included any of the header</td><td class="lineno" valign="top"></td></tr>
379      <tr><td><a name="diff0018" /></td></tr>
380      <tr><td class="lineno" valign="top"></td><td class="lblock">   fields Cache-Control, Content-Location, ETag, Expires, <span class="delete">Last-Modified,</span></td><td> </td><td class="rblock">   fields Cache-Control, Content-Location, ETag, Expires, or Vary, then</td><td class="lineno" valign="top"></td></tr>
381      <tr><td class="lineno" valign="top"></td><td class="lblock">   or Vary, then those same header fields MUST be sent in a 304</td><td> </td><td class="rblock">   those same header fields MUST be sent in a 304 response.</td><td class="lineno" valign="top"></td></tr>
382      <tr><td class="lineno" valign="top"></td><td class="lblock">   response.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
383      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
384      <tr><td class="lineno" valign="top"></td><td class="left">   Since the goal of a 304 response is to minimize information transfer</td><td> </td><td class="right">   Since the goal of a 304 response is to minimize information transfer</td><td class="lineno" valign="top"></td></tr>
385      <tr><td class="lineno" valign="top"></td><td class="left">   when the recipient already has one or more cached representations,</td><td> </td><td class="right">   when the recipient already has one or more cached representations,</td><td class="lineno" valign="top"></td></tr>
386      <tr><td class="lineno" valign="top"></td><td class="left">   the response SHOULD NOT include representation metadata other than</td><td> </td><td class="right">   the response SHOULD NOT include representation metadata other than</td><td class="lineno" valign="top"></td></tr>
387      <tr><td class="lineno" valign="top"></td><td class="left">   the above listed fields unless said metadata exists for the purpose</td><td> </td><td class="right">   the above listed fields unless said metadata exists for the purpose</td><td class="lineno" valign="top"></td></tr>
388      <tr><td class="lineno" valign="top"></td><td class="left">   of guiding cache updates (e.g., future HTTP extensions).</td><td> </td><td class="right">   of guiding cache updates (e.g., future HTTP extensions).</td><td class="lineno" valign="top"></td></tr>
389      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
390      <tr><td class="lineno" valign="top"></td><td class="left">   If the recipient of a 304 response does not have a cached</td><td> </td><td class="right">   If the recipient of a 304 response does not have a cached</td><td class="lineno" valign="top"></td></tr>
391      <tr><td class="lineno" valign="top"></td><td class="left">   representation corresponding to the entity-tag indicated by the 304</td><td> </td><td class="right">   representation corresponding to the entity-tag indicated by the 304</td><td class="lineno" valign="top"></td></tr>
392      <tr><td class="lineno" valign="top"></td><td class="left">   response, then the recipient MUST NOT use the 304 to update its own</td><td> </td><td class="right">   response, then the recipient MUST NOT use the 304 to update its own</td><td class="lineno" valign="top"></td></tr>
393      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
394      <tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 21, line 26</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 20, line 26</em></th><td></td></tr>
395      <tr><td class="lineno" valign="top"></td><td class="left">   The change controller is: "IETF (iesg@ietf.org) - Internet</td><td> </td><td class="right">   The change controller is: "IETF (iesg@ietf.org) - Internet</td><td class="lineno" valign="top"></td></tr>
396      <tr><td class="lineno" valign="top"></td><td class="left">   Engineering Task Force".</td><td> </td><td class="right">   Engineering Task Force".</td><td class="lineno" valign="top"></td></tr>
397      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
398      <tr><td class="lineno" valign="top"></td><td class="left">6.  Security Considerations</td><td> </td><td class="right">6.  Security Considerations</td><td class="lineno" valign="top"></td></tr>
399      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
400      <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>
401      <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>
402      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
403      <tr><td class="lineno" valign="top"></td><td class="left">7.  Acknowledgments</td><td> </td><td class="right">7.  Acknowledgments</td><td class="lineno" valign="top"></td></tr>
404      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
405      <tr><td><a name="diff0019" /></td></tr>
406      <tr><td class="lineno" valign="top"></td><td class="lblock">   See Section <span class="delete">11</span> of [Part1].</td><td> </td><td class="rblock">   See Section <span class="insert">9</span> of [Part1].</td><td class="lineno" valign="top"></td></tr>
407      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
408      <tr><td class="lineno" valign="top"></td><td class="left">8.  References</td><td> </td><td class="right">8.  References</td><td class="lineno" valign="top"></td></tr>
409      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
410      <tr><td class="lineno" valign="top"></td><td class="left">8.1.  Normative References</td><td> </td><td class="right">8.1.  Normative References</td><td class="lineno" valign="top"></td></tr>
411      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
412      <tr><td><a name="diff0020" /></td></tr>
413      <tr><td class="lineno" valign="top"></td><td class="lblock">   [Part1]    Fielding, R., Ed., <span class="delete">Gettys, J., Mogul, J., Frystyk, H.,</span></td><td> </td><td class="rblock">   [Part1]    Fielding, R., Ed., Lafon, Y., Ed., and J. Reschke, Ed.,</td><td class="lineno" valign="top"></td></tr>
414      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">              Masinter, L., Leach, P., Berners-Lee, T.,</span> Lafon, Y., Ed.,</td><td> </td><td class="rblock">              "HTTP/1.1, part 1: URIs, Connections, and Message</td><td class="lineno" valign="top"></td></tr>
415      <tr><td class="lineno" valign="top"></td><td class="lblock">              and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,</td><td> </td><td class="rblock">              Parsing", <span class="insert">draft-ietf-httpbis-p1-messaging-19</span> (work in</td><td class="lineno" valign="top"></td></tr>
416      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Message Parsing", <span class="delete">draft-ietf-httpbis-p1-messaging-18</span></td><td> </td><td class="rblock">              progress), <span class="insert">March</span> 2012.</td><td class="lineno" valign="top"></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">January</span> 2012.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
418      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
419      <tr><td><a name="diff0021" /></td></tr>
420      <tr><td class="lineno" valign="top"></td><td class="lblock">   [Part2]    Fielding, R., Ed., <span class="delete">Gettys, J., Mogul, J., Frystyk, H.,</span></td><td> </td><td class="rblock">   [Part2]    Fielding, R., Ed., Lafon, Y., Ed., and J. Reschke, Ed.,</td><td class="lineno" valign="top"></td></tr>
421      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">              Masinter, L., Leach, P., Berners-Lee, T.,</span> Lafon, Y., Ed.,</td><td> </td><td class="rblock">              "HTTP/1.1, part 2: Message Semantics",</td><td class="lineno" valign="top"></td></tr>
422      <tr><td class="lineno" valign="top"></td><td class="lblock">              and J. Reschke, Ed., "HTTP/1.1, part 2: Message</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p2-semantics-19</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
423      <tr><td class="lineno" valign="top"></td><td class="lblock">              Semantics", <span class="delete">draft-ietf-httpbis-p2-semantics-18</span> (work in</td><td> </td><td class="rblock">              <span class="insert">March</span> 2012.</td><td class="lineno" valign="top"></td></tr>
424      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">January</span> 2012.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
425      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
426      <tr><td><a name="diff0022" /></td></tr>
427      <tr><td class="lineno" valign="top"></td><td class="lblock">   [Part3]    Fielding, R., Ed., <span class="delete">Gettys, J., Mogul, J., Frystyk, H.,</span></td><td> </td><td class="rblock">   [Part3]    Fielding, R., Ed., Lafon, Y., Ed., and J. Reschke, Ed.,</td><td class="lineno" valign="top"></td></tr>
428      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">              Masinter, L., Leach, P., Berners-Lee, T.,</span> Lafon, Y., Ed.,</td><td> </td><td class="rblock">              "HTTP/1.1, part 3: Message Payload and Content</td><td class="lineno" valign="top"></td></tr>
429      <tr><td class="lineno" valign="top"></td><td class="lblock">              and J. Reschke, Ed., "HTTP/1.1, part 3: Message Payload</td><td> </td><td class="rblock">              Negotiation", <span class="insert">draft-ietf-httpbis-p3-payload-19</span> (work in</td><td class="lineno" valign="top"></td></tr>
430      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Content Negotiation", <span class="delete">draft-ietf-httpbis-p3-payload-18</span></td><td> </td><td class="rblock">              progress), <span class="insert">March</span> 2012.</td><td class="lineno" valign="top"></td></tr>
431      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">January</span> 2012.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
432      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
433      <tr><td><a name="diff0023" /></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="lblock">   [Part5]    Fielding, R., Ed., <span class="delete">Gettys, J., Mogul, J., Frystyk, H.,</span></td><td> </td><td class="rblock">   [Part5]    Fielding, R., Ed., Lafon, Y., Ed., and J. Reschke, Ed.,</td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">              Masinter, L., Leach, P., Berners-Lee, T.,</span> Lafon, Y., Ed.,</td><td> </td><td class="rblock">              "HTTP/1.1, part 5: Range Requests and Partial Responses",</td><td class="lineno" valign="top"></td></tr>
436      <tr><td class="lineno" valign="top"></td><td class="lblock">              and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p5-range-19</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
437      <tr><td class="lineno" valign="top"></td><td class="lblock">              Partial Responses", <span class="delete">draft-ietf-httpbis-p5-range-18</span> (work</td><td> </td><td class="rblock">              <span class="insert">March</span> 2012.</td><td class="lineno" valign="top"></td></tr>
438      <tr><td class="lineno" valign="top"></td><td class="lblock">              in progress), <span class="delete">January</span> 2012.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
439      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
440      <tr><td><a name="diff0024" /></td></tr>
441      <tr><td class="lineno" valign="top"></td><td class="lblock">   [Part6]    Fielding, R., Ed., <span class="delete">Gettys, J., Mogul, J., Frystyk, H.,</span></td><td> </td><td class="rblock">   [Part6]    Fielding, R., Ed., Lafon, Y., Ed., Nottingham, M., Ed.,</td><td class="lineno" valign="top"></td></tr>
442      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">              Masinter, L., Leach, P., Berners-Lee, T.,</span> Lafon, Y., Ed.,</td><td> </td><td class="rblock">              and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",</td><td class="lineno" valign="top"></td></tr>
443      <tr><td class="lineno" valign="top"></td><td class="lblock">              Nottingham, M., Ed., and J. Reschke, Ed., "HTTP/1.1, part</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p6-cache-19</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
444      <tr><td class="lineno" valign="top"></td><td class="lblock">              6: Caching", <span class="delete">draft-ietf-httpbis-p6-cache-18</span> (work in</td><td> </td><td class="rblock">              <span class="insert">March</span> 2012.</td><td class="lineno" valign="top"></td></tr>
445      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">January</span> 2012.</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"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
447      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate</td><td> </td><td class="right">   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate</td><td class="lineno" valign="top"></td></tr>
448      <tr><td class="lineno" valign="top"></td><td class="left">              Requirement Levels", BCP 14, RFC 2119, March 1997.</td><td> </td><td class="right">              Requirement Levels", BCP 14, RFC 2119, March 1997.</td><td class="lineno" valign="top"></td></tr>
449      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
450      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax</td><td> </td><td class="right">   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax</td><td class="lineno" valign="top"></td></tr>
451      <tr><td class="lineno" valign="top"></td><td class="left">              Specifications: ABNF", STD 68, RFC 5234, January 2008.</td><td> </td><td class="right">              Specifications: ABNF", STD 68, RFC 5234, January 2008.</td><td class="lineno" valign="top"></td></tr>
452      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
453      <tr><td class="lineno" valign="top"></td><td class="left">8.2.  Informative References</td><td> </td><td class="right">8.2.  Informative References</td><td class="lineno" valign="top"></td></tr>
454      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
455      <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>
456      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
457      <tr bgcolor="gray" ><td></td><th><a name="part-l12" /><small>skipping to change at</small><em> page 23, line 20</em></th><th> </th><th><a name="part-r12" /><small>skipping to change at</small><em> page 22, line 20</em></th><td></td></tr>
458      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
459      <tr><td class="lineno" valign="top"></td><td class="left">   If-Match = "*" / ( *( "," OWS ) entity-tag *( OWS "," [ OWS</td><td> </td><td class="right">   If-Match = "*" / ( *( "," OWS ) entity-tag *( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
460      <tr><td class="lineno" valign="top"></td><td class="left">    entity-tag ] ) )</td><td> </td><td class="right">    entity-tag ] ) )</td><td class="lineno" valign="top"></td></tr>
461      <tr><td class="lineno" valign="top"></td><td class="left">   If-Modified-Since = HTTP-date</td><td> </td><td class="right">   If-Modified-Since = HTTP-date</td><td class="lineno" valign="top"></td></tr>
462      <tr><td class="lineno" valign="top"></td><td class="left">   If-None-Match = "*" / ( *( "," OWS ) entity-tag *( OWS "," [ OWS</td><td> </td><td class="right">   If-None-Match = "*" / ( *( "," OWS ) entity-tag *( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
463      <tr><td class="lineno" valign="top"></td><td class="left">    entity-tag ] ) )</td><td> </td><td class="right">    entity-tag ] ) )</td><td class="lineno" valign="top"></td></tr>
464      <tr><td class="lineno" valign="top"></td><td class="left">   If-Unmodified-Since = HTTP-date</td><td> </td><td class="right">   If-Unmodified-Since = HTTP-date</td><td class="lineno" valign="top"></td></tr>
465      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
466      <tr><td class="lineno" valign="top"></td><td class="left">   Last-Modified = HTTP-date</td><td> </td><td class="right">   Last-Modified = HTTP-date</td><td class="lineno" valign="top"></td></tr>
467      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
468      <tr><td><a name="diff0025" /></td></tr>
469      <tr><td class="lineno" valign="top"></td><td class="lblock">   OWS = &lt;OWS, defined in [Part1], Section <span class="delete">1.2.2</span>&gt;</td><td> </td><td class="rblock">   OWS = &lt;OWS, defined in [Part1], Section <span class="insert">3.2.1</span>&gt;</td><td class="lineno" valign="top"></td></tr>
470      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
471      <tr><td class="lineno" valign="top"></td><td class="left">   entity-tag = [ weak ] opaque-tag</td><td> </td><td class="right">   entity-tag = [ weak ] opaque-tag</td><td class="lineno" valign="top"></td></tr>
472      <tr><td class="lineno" valign="top"></td><td class="left">   etagc = "!" / %x23-7E ; '#'-'~'</td><td> </td><td class="right">   etagc = "!" / %x23-7E ; '#'-'~'</td><td class="lineno" valign="top"></td></tr>
473      <tr><td class="lineno" valign="top"></td><td class="left">    / obs-text</td><td> </td><td class="right">    / obs-text</td><td class="lineno" valign="top"></td></tr>
474      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
475      <tr><td><a name="diff0026" /></td></tr>
476      <tr><td class="lineno" valign="top"></td><td class="lblock">   obs-text = &lt;obs-text, defined in [Part1], Section 3.2.<span class="delete">3</span>&gt;</td><td> </td><td class="rblock">   obs-text = &lt;obs-text, defined in [Part1], Section 3.2.<span class="insert">4</span>&gt;</td><td class="lineno" valign="top"></td></tr>
477      <tr><td class="lineno" valign="top"></td><td class="left">   opaque-tag = DQUOTE *etagc DQUOTE</td><td> </td><td class="right">   opaque-tag = DQUOTE *etagc DQUOTE</td><td class="lineno" valign="top"></td></tr>
478      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
479      <tr><td class="lineno" valign="top"></td><td class="left">   weak = %x57.2F ; W/</td><td> </td><td class="right">   weak = %x57.2F ; W/</td><td class="lineno" valign="top"></td></tr>
480      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
481      <tr><td class="lineno" valign="top"></td><td class="left">   ABNF diagnostics:</td><td> </td><td class="right">   ABNF diagnostics:</td><td class="lineno" valign="top"></td></tr>
482      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
483      <tr><td class="lineno" valign="top"></td><td class="left">   ; ETag defined but not used</td><td> </td><td class="right">   ; ETag defined but not used</td><td class="lineno" valign="top"></td></tr>
484      <tr><td class="lineno" valign="top"></td><td class="left">   ; If-Match defined but not used</td><td> </td><td class="right">   ; If-Match defined but not used</td><td class="lineno" valign="top"></td></tr>
485      <tr><td class="lineno" valign="top"></td><td class="left">   ; If-Modified-Since defined but not used</td><td> </td><td class="right">   ; If-Modified-Since defined but not used</td><td class="lineno" valign="top"></td></tr>
486      <tr><td class="lineno" valign="top"></td><td class="left">   ; If-None-Match defined but not used</td><td> </td><td class="right">   ; If-None-Match defined but not used</td><td class="lineno" valign="top"></td></tr>
487      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
488      <tr bgcolor="gray" ><td></td><th><a name="part-l13" /><small>skipping to change at</small><em> page 27, line 12</em></th><th> </th><th><a name="part-r13" /><small>skipping to change at</small><em> page 26, line 12</em></th><td></td></tr>
489      <tr><td class="lineno" valign="top"></td><td class="left">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/186&gt;: "Document</td><td> </td><td class="right">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/186&gt;: "Document</td><td class="lineno" valign="top"></td></tr>
490      <tr><td class="lineno" valign="top"></td><td class="left">      HTTP's error-handling philosophy"</td><td> </td><td class="right">      HTTP's error-handling philosophy"</td><td class="lineno" valign="top"></td></tr>
491      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
492      <tr><td class="lineno" valign="top"></td><td class="left">C.19.  Since draft-ietf-httpbis-p4-conditional-17</td><td> </td><td class="right">C.19.  Since draft-ietf-httpbis-p4-conditional-17</td><td class="lineno" valign="top"></td></tr>
493      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
494      <tr><td class="lineno" valign="top"></td><td class="left">   Closed issues:</td><td> </td><td class="right">   Closed issues:</td><td class="lineno" valign="top"></td></tr>
495      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
496      <tr><td class="lineno" valign="top"></td><td class="left">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/306&gt;: "does etag</td><td> </td><td class="right">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/306&gt;: "does etag</td><td class="lineno" valign="top"></td></tr>
497      <tr><td class="lineno" valign="top"></td><td class="left">      value really use quoted-string"</td><td> </td><td class="right">      value really use quoted-string"</td><td class="lineno" valign="top"></td></tr>
498      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
499      <tr><td><a name="diff0027" /></td></tr>
500      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">C.20.  Since draft-ietf-httpbis-p4-conditional-18</span></td><td class="lineno" valign="top"></td></tr>
501      <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>
502      <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>
503      <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>
504      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/345&gt;: "Required</span></td><td class="lineno" valign="top"></td></tr>
505      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      headers on 304 and 206"</span></td><td class="lineno" valign="top"></td></tr>
506      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
507      <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>
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">   3</td><td> </td><td class="right">   3</td><td class="lineno" valign="top"></td></tr>
510      <tr><td><a name="diff0028" /></td></tr>
511      <tr><td class="lineno" valign="top"></td><td class="lblock">      304 Not Modified (status code)  1<span class="delete">9</span></td><td> </td><td class="rblock">      304 Not Modified (status code)  1<span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
512      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
513      <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>
514      <tr><td><a name="diff0029" /></td></tr>
515      <tr><td class="lineno" valign="top"></td><td class="lblock">      412 Precondition Failed (status code)  <span class="delete">20</span></td><td> </td><td class="rblock">      412 Precondition Failed (status code)  <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
516      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
517      <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>
518      <tr><td><a name="diff0030" /></td></tr>
519      <tr><td class="lineno" valign="top"></td><td class="lblock">      ETag header field  <span class="delete">10</span></td><td> </td><td class="rblock">      ETag header field  <span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
520      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
521      <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>
522      <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>
523      <tr><td><a name="diff0031" /></td></tr>
524      <tr><td class="lineno" valign="top"></td><td class="lblock">         entity-tag  <span class="delete">10</span></td><td> </td><td class="rblock">         entity-tag  <span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
525      <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">9</span></td><td class="lineno" valign="top"></td></tr>
526      <tr><td class="lineno" valign="top"></td><td class="lblock">         etagc  <span class="delete">10</span></td><td> </td><td class="rblock">         etagc  <span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
527      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Match  <span class="delete">15</span></td><td> </td><td class="rblock">         If-Match  <span class="insert">14</span></td><td class="lineno" valign="top"></td></tr>
528      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Modified-Since  <span class="delete">17</span></td><td> </td><td class="rblock">         If-Modified-Since  16</td><td class="lineno" valign="top"></td></tr>
529      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         If-None-Match</span>  16</td><td> </td><td class="rblock">         <span class="insert">If-None-Match  15</span></td><td class="lineno" valign="top"></td></tr>
530      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Unmodified-Since  <span class="delete">18</span></td><td> </td><td class="rblock">         If-Unmodified-Since  <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
531      <tr><td class="lineno" valign="top"></td><td class="lblock">         Last-Modified  <span class="delete">8</span></td><td> </td><td class="rblock">         Last-Modified  <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
532      <tr><td class="lineno" valign="top"></td><td class="lblock">         opaque-tag  <span class="delete">10</span></td><td> </td><td class="rblock">         opaque-tag  <span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
533      <tr><td class="lineno" valign="top"></td><td class="lblock">         weak  <span class="delete">10</span></td><td> </td><td class="rblock">         weak  <span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
534      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
535      <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>
536      <tr><td class="lineno" valign="top"></td><td class="left">      Header Fields</td><td> </td><td class="right">      Header Fields</td><td class="lineno" valign="top"></td></tr>
537      <tr><td><a name="diff0032" /></td></tr>
538      <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">9</span></td><td class="lineno" valign="top"></td></tr>
539      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Match  <span class="delete">15</span></td><td> </td><td class="rblock">         If-Match  <span class="insert">14</span></td><td class="lineno" valign="top"></td></tr>
540      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Modified-Since  <span class="delete">17</span></td><td> </td><td class="rblock">         If-Modified-Since  16</td><td class="lineno" valign="top"></td></tr>
541      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         If-None-Match</span>  16</td><td> </td><td class="rblock">         <span class="insert">If-None-Match  15</span></td><td class="lineno" valign="top"></td></tr>
542      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Unmodified-Since  <span class="delete">18</span></td><td> </td><td class="rblock">         If-Unmodified-Since  <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
543      <tr><td class="lineno" valign="top"></td><td class="lblock">         Last-Modified  <span class="delete">8</span></td><td> </td><td class="rblock">         Last-Modified  <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
544      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
545      <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>
546      <tr><td><a name="diff0033" /></td></tr>
547      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-Match header field  <span class="delete">15</span></td><td> </td><td class="rblock">      If-Match header field  <span class="insert">14</span></td><td class="lineno" valign="top"></td></tr>
548      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-Modified-Since header field  <span class="delete">17</span></td><td> </td><td class="rblock">      If-Modified-Since header field  <span class="insert">16</span></td><td class="lineno" valign="top"></td></tr>
549      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-None-Match header field  <span class="delete">16</span></td><td> </td><td class="rblock">      If-None-Match header field  <span class="insert">15</span></td><td class="lineno" valign="top"></td></tr>
550      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-Unmodified-Since header field  <span class="delete">18</span></td><td> </td><td class="rblock">      If-Unmodified-Since header field  <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
551      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
552      <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>
553      <tr><td><a name="diff0034" /></td></tr>
554      <tr><td class="lineno" valign="top"></td><td class="lblock">      Last-Modified header field  <span class="delete">8</span></td><td> </td><td class="rblock">      Last-Modified header field  <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
555      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
556      <tr><td class="lineno" valign="top"></td><td class="left">   M</td><td> </td><td class="right">   M</td><td class="lineno" valign="top"></td></tr>
557      <tr><td><a name="diff0035" /></td></tr>
558      <tr><td class="lineno" valign="top"></td><td class="lblock">      metadata  <span class="delete">6</span></td><td> </td><td class="rblock">      metadata  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
559      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
560      <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>
561      <tr><td><a name="diff0036" /></td></tr>
562      <tr><td class="lineno" valign="top"></td><td class="lblock">      selected representation  <span class="delete">5</span></td><td> </td><td class="rblock">      selected representation  <span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
563      <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>
564      <tr><td><a name="diff0037" /></td></tr>
565      <tr><td class="lineno" valign="top"></td><td class="lblock">         304 Not Modified  <span class="delete">19</span></td><td> </td><td class="rblock">         304 Not Modified  <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
566      <tr><td class="lineno" valign="top"></td><td class="lblock">         412 Precondition Failed  <span class="delete">20</span></td><td> </td><td class="rblock">         412 Precondition Failed  <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
567      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
568      <tr><td class="lineno" valign="top"></td><td class="left">   V</td><td> </td><td class="right">   V</td><td class="lineno" valign="top"></td></tr>
569      <tr><td><a name="diff0038" /></td></tr>
570      <tr><td class="lineno" valign="top"></td><td class="lblock">      validator  <span class="delete">6</span></td><td> </td><td class="rblock">      validator  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
571      <tr><td class="lineno" valign="top"></td><td class="lblock">         strong  <span class="delete">6</span></td><td> </td><td class="rblock">         strong  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
572      <tr><td class="lineno" valign="top"></td><td class="lblock">         weak  <span class="delete">6</span></td><td> </td><td class="rblock">         weak  <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
573      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
574      <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>
575      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
576      <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>
577      <tr><td class="lineno" valign="top"></td><td class="left">   Adobe Systems Incorporated</td><td> </td><td class="right">   Adobe Systems Incorporated</td><td class="lineno" valign="top"></td></tr>
578      <tr><td class="lineno" valign="top"></td><td class="left">   345 Park Ave</td><td> </td><td class="right">   345 Park Ave</td><td class="lineno" valign="top"></td></tr>
579      <tr><td class="lineno" valign="top"></td><td class="left">   San Jose, CA  95110</td><td> </td><td class="right">   San Jose, CA  95110</td><td class="lineno" valign="top"></td></tr>
580      <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>
581      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
582      <tr><td class="lineno" valign="top"></td><td class="left">   EMail: fielding@gbiv.com</td><td> </td><td class="right">   EMail: fielding@gbiv.com</td><td class="lineno" valign="top"></td></tr>
583      <tr><td class="lineno" valign="top"></td><td class="left">   URI:   http://roy.gbiv.com/</td><td> </td><td class="right">   URI:   http://roy.gbiv.com/</td><td class="lineno" valign="top"></td></tr>
584      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
585      <tr><td><a name="diff0039" /></td></tr>
586      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">Jim Gettys</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
587      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Alcatel-Lucent Bell Labs</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
588      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   21 Oak Knoll Road</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
589      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Carlisle, MA  01741</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
590      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   USA</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
591      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
592      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   EMail: jg@freedesktop.org</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
593      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   URI:   http://gettys.wordpress.com/</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
594      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
595      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Jeffrey C. Mogul</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
596      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Hewlett-Packard Company</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
597      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   HP Labs, Large Scale Systems Group</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
598      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   1501 Page Mill Road, MS 1177</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
599      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Palo Alto, CA  94304</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
600      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   USA</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
601      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
602      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   EMail: JeffMogul@acm.org</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
603      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Henrik Frystyk Nielsen</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
604      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Microsoft Corporation</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
605      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   1 Microsoft Way</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
606      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Redmond, WA  98052</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
607      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   USA</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
608      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
609      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   EMail: henrikn@microsoft.com</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
610      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
611      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Larry Masinter</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
612      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Adobe Systems Incorporated</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
613      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   345 Park Ave</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
614      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   San Jose, CA  95110</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
615      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   USA</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
616      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
617      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   EMail: LMM@acm.org</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
618      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   URI:   http://larry.masinter.net/</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
619      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
620      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Paul J. Leach</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
621      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Microsoft Corporation</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
622      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   1 Microsoft Way</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
623      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Redmond, WA  98052</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
624      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
625      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   EMail: paulle@microsoft.com</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
626      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
627      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Tim Berners-Lee</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
628      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   World Wide Web Consortium</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
629      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   MIT Computer Science and Artificial Intelligence Laboratory</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
630      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   The Stata Center, Building 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
631      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   32 Vassar Street</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
632      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Cambridge, MA  02139</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
633      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   USA</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
634      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
635      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   EMail: timbl@w3.org</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
636      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   URI:   http://www.w3.org/People/Berners-Lee/</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
637      <tr><td class="lineno" valign="top"></td><td class="left">   Yves Lafon (editor)</td><td> </td><td class="right">   Yves Lafon (editor)</td><td class="lineno" valign="top"></td></tr>
638      <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>
639      <tr><td class="lineno" valign="top"></td><td class="left">   W3C / ERCIM</td><td> </td><td class="right">   W3C / ERCIM</td><td class="lineno" valign="top"></td></tr>
640      <tr><td class="lineno" valign="top"></td><td class="left">   2004, rte des Lucioles</td><td> </td><td class="right">   2004, rte des Lucioles</td><td class="lineno" valign="top"></td></tr>
641      <tr><td class="lineno" valign="top"></td><td class="left">   Sophia-Antipolis, AM  06902</td><td> </td><td class="right">   Sophia-Antipolis, AM  06902</td><td class="lineno" valign="top"></td></tr>
642      <tr><td class="lineno" valign="top"></td><td class="left">   France</td><td> </td><td class="right">   France</td><td class="lineno" valign="top"></td></tr>
643      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
644      <tr><td class="lineno" valign="top"></td><td class="left">   EMail: ylafon@w3.org</td><td> </td><td class="right">   EMail: ylafon@w3.org</td><td class="lineno" valign="top"></td></tr>
645      <tr><td class="lineno" valign="top"></td><td class="left">   URI:   http://www.raubacapeu.net/people/yves/</td><td> </td><td class="right">   URI:   http://www.raubacapeu.net/people/yves/</td><td class="lineno" valign="top"></td></tr>
646      <tr><td><a name="diff0040" /></td></tr>
647      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                         </span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
648      <tr><td class="lineno" valign="top"></td><td class="left">   Julian F. Reschke (editor)</td><td> </td><td class="right">   Julian F. Reschke (editor)</td><td class="lineno" valign="top"></td></tr>
649      <tr><td class="lineno" valign="top"></td><td class="left">   greenbytes GmbH</td><td> </td><td class="right">   greenbytes GmbH</td><td class="lineno" valign="top"></td></tr>
650      <tr><td class="lineno" valign="top"></td><td class="left">   Hafenweg 16</td><td> </td><td class="right">   Hafenweg 16</td><td class="lineno" valign="top"></td></tr>
651      <tr><td class="lineno" valign="top"></td><td class="left">   Muenster, NW  48155</td><td> </td><td class="right">   Muenster, NW  48155</td><td class="lineno" valign="top"></td></tr>
652      <tr><td class="lineno" valign="top"></td><td class="left">   Germany</td><td> </td><td class="right">   Germany</td><td class="lineno" valign="top"></td></tr>
653      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
654      <tr><td class="lineno" valign="top"></td><td class="left">   Phone: +49 251 2807760</td><td> </td><td class="right">   Phone: +49 251 2807760</td><td class="lineno" valign="top"></td></tr>
655      <tr><td class="lineno" valign="top"></td><td class="left">   Fax:   +49 251 2807761</td><td> </td><td class="right">   Fax:   +49 251 2807761</td><td class="lineno" valign="top"></td></tr>
656      <tr><td class="lineno" valign="top"></td><td class="left">   EMail: julian.reschke@greenbytes.de</td><td> </td><td class="right">   EMail: julian.reschke@greenbytes.de</td><td class="lineno" valign="top"></td></tr>
657      <tr><td class="lineno" valign="top"></td><td class="left">   URI:   http://greenbytes.de/tech/webdav/</td><td> </td><td class="right">   URI:   http://greenbytes.de/tech/webdav/</td><td class="lineno" valign="top"></td></tr>
658
659     <tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
660     <tr bgcolor="gray"><th colspan="5" align="center"><a name="end">&nbsp;End of changes. 40 change blocks.&nbsp;</a></th></tr>
661     <tr class="stats"><td></td><th><i>199 lines changed or deleted</i></th><th><i> </i></th><th><i>138 lines changed or added</i></th><td></td></tr>
662     <tr><td colspan="5" align="center" class="small"><br/>This html diff was produced by rfcdiff 1.38. The latest version is available from <a href="http://www.tools.ietf.org/tools/rfcdiff/" >http://tools.ietf.org/tools/rfcdiff/</a> </td></tr>
663   </table>
664   </body>
665   </html>
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