source: draft-ietf-httpbis/diffs/draft-ietf-httpbis-p4-conditional-18-from-17.diff.html @ 2110

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37  <table border="0" cellpadding="0" cellspacing="0">
38  <tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p4-conditional-17.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p4-conditional-18.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 class="lineno" valign="top"></td><td class="left">Obsoletes: 2616 (if approved)                                  J. Gettys</td><td> </td><td class="right">Obsoletes: 2616 (if approved)                                  J. Gettys</td><td class="lineno" valign="top"></td></tr>
43      <tr><td class="lineno" valign="top"></td><td class="left">Intended status: Standards Track                          Alcatel-Lucent</td><td> </td><td class="right">Intended status: Standards Track                          Alcatel-Lucent</td><td class="lineno" valign="top"></td></tr>
44      <tr><td><a name="diff0001" /></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">May 3, 2012 </span>                                           J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">July 7, 2012</span>                                           J. Mogul</td><td class="lineno" valign="top"></td></tr>
46      <tr><td class="lineno" valign="top"></td><td class="left">                                                                      HP</td><td> </td><td class="right">                                                                      HP</td><td class="lineno" valign="top"></td></tr>
47      <tr><td class="lineno" valign="top"></td><td class="left">                                                              H. Frystyk</td><td> </td><td class="right">                                                              H. Frystyk</td><td class="lineno" valign="top"></td></tr>
48      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
49      <tr><td class="lineno" valign="top"></td><td class="left">                                                             L. Masinter</td><td> </td><td class="right">                                                             L. Masinter</td><td class="lineno" valign="top"></td></tr>
50      <tr><td class="lineno" valign="top"></td><td class="left">                                                                   Adobe</td><td> </td><td class="right">                                                                   Adobe</td><td class="lineno" valign="top"></td></tr>
51      <tr><td class="lineno" valign="top"></td><td class="left">                                                                P. Leach</td><td> </td><td class="right">                                                                P. Leach</td><td class="lineno" valign="top"></td></tr>
52      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
53      <tr><td class="lineno" valign="top"></td><td class="left">                                                          T. Berners-Lee</td><td> </td><td class="right">                                                          T. Berners-Lee</td><td class="lineno" valign="top"></td></tr>
54      <tr><td class="lineno" valign="top"></td><td class="left">                                                                 W3C/MIT</td><td> </td><td class="right">                                                                 W3C/MIT</td><td class="lineno" valign="top"></td></tr>
55      <tr><td class="lineno" valign="top"></td><td class="left">                                                           Y. Lafon, Ed.</td><td> </td><td class="right">                                                           Y. Lafon, Ed.</td><td class="lineno" valign="top"></td></tr>
56      <tr><td class="lineno" valign="top"></td><td class="left">                                                                     W3C</td><td> </td><td class="right">                                                                     W3C</td><td class="lineno" valign="top"></td></tr>
57      <tr><td class="lineno" valign="top"></td><td class="left">                                                         J. Reschke, Ed.</td><td> </td><td class="right">                                                         J. Reschke, Ed.</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">October 31, 2011</span></td><td> </td><td class="rblock">                                                        <span class="insert"> January 4, 2012</span></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">7</span></td><td> </td><td class="rblock">                  draft-ietf-httpbis-p4-conditional-1<span class="insert">8</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 49</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.1<span class="delete">8</span>.</td><td> </td><td class="rblock">   The changes in this draft are summarized in Appendix C.1<span class="insert">9</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">May 3</span>, 2012.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">July 7</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><a name="diff0006" /></td></tr>
111      <tr><td class="lineno" valign="top"></td><td class="lblock">   Copyright (c) 201<span class="delete">1</span> IETF Trust and the persons identified as the</td><td> </td><td class="rblock">   Copyright (c) 201<span class="insert">2</span> IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
112      <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>
113      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
114      <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>
115      <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>
116      <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>
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119      <tr><td class="lineno" valign="top"></td><td class="left">   to this document.  Code Components extracted from this document must</td><td> </td><td class="right">   to this document.  Code Components extracted from this document must</td><td class="lineno" valign="top"></td></tr>
120      <tr><td class="lineno" valign="top"></td><td class="left">   include Simplified BSD License text as described in Section 4.e of</td><td> </td><td class="right">   include Simplified BSD License text as described in Section 4.e of</td><td class="lineno" valign="top"></td></tr>
121      <tr><td class="lineno" valign="top"></td><td class="left">   the Trust Legal Provisions and are provided without warranty as</td><td> </td><td class="right">   the Trust Legal Provisions and are provided without warranty as</td><td class="lineno" valign="top"></td></tr>
122      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
123      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 3, line 12</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 3, line 12</em></th><td></td></tr>
124      <tr><td class="lineno" valign="top"></td><td class="left">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td> </td><td class="right">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
125      <tr><td class="lineno" valign="top"></td><td class="left">     1.1.  Conformance and Error Handling . . . . . . . . . . . . . .  5</td><td> </td><td class="right">     1.1.  Conformance and Error Handling . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
126      <tr><td class="lineno" valign="top"></td><td class="left">     1.2.  Syntax Notation  . . . . . . . . . . . . . . . . . . . . .  6</td><td> </td><td class="right">     1.2.  Syntax Notation  . . . . . . . . . . . . . . . . . . . . .  6</td><td class="lineno" valign="top"></td></tr>
127      <tr><td class="lineno" valign="top"></td><td class="left">   2.  Validators . . . . . . . . . . . . . . . . . . . . . . . . . .  6</td><td> </td><td class="right">   2.  Validators . . . . . . . . . . . . . . . . . . . . . . . . . .  6</td><td class="lineno" valign="top"></td></tr>
128      <tr><td class="lineno" valign="top"></td><td class="left">     2.1.  Weak versus Strong . . . . . . . . . . . . . . . . . . . .  6</td><td> </td><td class="right">     2.1.  Weak versus Strong . . . . . . . . . . . . . . . . . . . .  6</td><td class="lineno" valign="top"></td></tr>
129      <tr><td class="lineno" valign="top"></td><td class="left">     2.2.  Last-Modified  . . . . . . . . . . . . . . . . . . . . . .  8</td><td> </td><td class="right">     2.2.  Last-Modified  . . . . . . . . . . . . . . . . . . . . . .  8</td><td class="lineno" valign="top"></td></tr>
130      <tr><td class="lineno" valign="top"></td><td class="left">       2.2.1.  Generation . . . . . . . . . . . . . . . . . . . . . .  8</td><td> </td><td class="right">       2.2.1.  Generation . . . . . . . . . . . . . . . . . . . . . .  8</td><td class="lineno" valign="top"></td></tr>
131      <tr><td class="lineno" valign="top"></td><td class="left">       2.2.2.  Comparison . . . . . . . . . . . . . . . . . . . . . .  9</td><td> </td><td class="right">       2.2.2.  Comparison . . . . . . . . . . . . . . . . . . . . . .  9</td><td class="lineno" valign="top"></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="left">     2.3.  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 10</td><td> </td><td class="right">     2.3.  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 10</td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.1.  Generation . . . . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="right">       2.3.1.  Generation . . . . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
134      <tr><td><a name="diff0007" /></td></tr>
135      <tr><td class="lineno" valign="top"></td><td class="lblock">       2.3.2.  Comparison . . . . . . . . . . . . . . . . . . . . . . 1<span class="delete">1</span></td><td> </td><td class="rblock">       2.3.2.  Comparison . . . . . . . . . . . . . . . . . . . . . . 1<span class="insert">2</span></td><td class="lineno" valign="top"></td></tr>
136      <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>
137      <tr><td class="lineno" valign="top"></td><td class="left">               Resources  . . . . . . . . . . . . . . . . . . . . . . 12</td><td> </td><td class="right">               Resources  . . . . . . . . . . . . . . . . . . . . . . 12</td><td class="lineno" valign="top"></td></tr>
138      <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>
139      <tr><td class="lineno" valign="top"></td><td class="left">           Dates  . . . . . . . . . . . . . . . . . . . . . . . . . . 13</td><td> </td><td class="right">           Dates  . . . . . . . . . . . . . . . . . . . . . . . . . . 13</td><td class="lineno" valign="top"></td></tr>
140      <tr><td><a name="diff0008" /></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="lblock">   3.  Precondition Header Fields . . . . . . . . . . . . . . . . . . 1<span class="delete">4</span></td><td> </td><td class="rblock">   3.  Precondition Header Fields . . . . . . . . . . . . . . . . . . 1<span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
142      <tr><td class="lineno" valign="top"></td><td class="left">     3.1.  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 15</td><td> </td><td class="right">     3.1.  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 15</td><td class="lineno" valign="top"></td></tr>
143      <tr><td><a name="diff0009" /></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.2.  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . 1<span class="delete">5</span></td><td> </td><td class="rblock">     3.2.  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . 1<span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
145      <tr><td class="lineno" valign="top"></td><td class="left">     3.3.  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">     3.3.  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
146      <tr><td class="lineno" valign="top"></td><td class="left">     3.4.  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right">     3.4.  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
147      <tr><td class="lineno" valign="top"></td><td class="left">     3.5.  If-Range . . . . . . . . . . . . . . . . . . . . . . . . . 19</td><td> </td><td class="right">     3.5.  If-Range . . . . . . . . . . . . . . . . . . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="left">   4.  Status Code Definitions  . . . . . . . . . . . . . . . . . . . 19</td><td> </td><td class="right">   4.  Status Code Definitions  . . . . . . . . . . . . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
149      <tr><td class="lineno" valign="top"></td><td class="left">     4.1.  304 Not Modified . . . . . . . . . . . . . . . . . . . . . 19</td><td> </td><td class="right">     4.1.  304 Not Modified . . . . . . . . . . . . . . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
150      <tr><td class="lineno" valign="top"></td><td class="left">     4.2.  412 Precondition Failed  . . . . . . . . . . . . . . . . . 20</td><td> </td><td class="right">     4.2.  412 Precondition Failed  . . . . . . . . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
151      <tr><td class="lineno" valign="top"></td><td class="left">   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 20</td><td> </td><td class="right">   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
152      <tr><td class="lineno" valign="top"></td><td class="left">     5.1.  Status Code Registration . . . . . . . . . . . . . . . . . 20</td><td> </td><td class="right">     5.1.  Status Code Registration . . . . . . . . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
153      <tr><td class="lineno" valign="top"></td><td class="left">     5.2.  Header Field Registration  . . . . . . . . . . . . . . . . 20</td><td> </td><td class="right">     5.2.  Header Field Registration  . . . . . . . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
154      <tr><td><a name="diff0010" /></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="lblock">   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 2<span class="delete">0</span></td><td> </td><td class="rblock">   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 2<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
156      <tr><td class="lineno" valign="top"></td><td class="left">   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 21</td><td> </td><td class="right">   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 21</td><td class="lineno" valign="top"></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="left">   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 21</td><td> </td><td class="right">   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 21</td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno" valign="top"></td><td class="left">     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 21</td><td> </td><td class="right">     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 21</td><td class="lineno" valign="top"></td></tr>
159      <tr><td><a name="diff0011" /></td></tr>
160      <tr><td class="lineno" valign="top"></td><td class="lblock">     8.2.  Informative References . . . . . . . . . . . . . . . . . . 2<span class="delete">1</span></td><td> </td><td class="rblock">     8.2.  Informative References . . . . . . . . . . . . . . . . . . 2<span class="insert">2</span></td><td class="lineno" valign="top"></td></tr>
161      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . 22</td><td> </td><td class="right">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . 22</td><td class="lineno" valign="top"></td></tr>
162      <tr><td><a name="diff0012" /></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . 2<span class="delete">2</span></td><td> </td><td class="rblock">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . 2<span class="insert">3</span></td><td class="lineno" valign="top"></td></tr>
164      <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>
165      <tr><td class="lineno" valign="top"></td><td class="left">                publication)  . . . . . . . . . . . . . . . . . . . . 23</td><td> </td><td class="right">                publication)  . . . . . . . . . . . . . . . . . . . . 23</td><td class="lineno" valign="top"></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="left">     C.1.  Since RFC 2616 . . . . . . . . . . . . . . . . . . . . . . 23</td><td> </td><td class="right">     C.1.  Since RFC 2616 . . . . . . . . . . . . . . . . . . . . . . 23</td><td class="lineno" valign="top"></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="left">     C.2.  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 23</td><td> </td><td class="right">     C.2.  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 23</td><td class="lineno" valign="top"></td></tr>
168      <tr><td><a name="diff0013" /></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.3.  Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . <span class="delete">23</span></td><td> </td><td class="rblock">     C.3.  Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
170      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.4.  Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . <span class="delete">23</span></td><td> </td><td class="rblock">     C.4.  Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="left">     C.5.  Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . 24</td><td> </td><td class="right">     C.5.  Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="left">     C.6.  Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . 24</td><td> </td><td class="right">     C.6.  Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
173      <tr><td><a name="diff0014" /></td></tr>
174      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.7.  Since draft-ietf-httpbis-p4-conditional-05 . . . . . . . . <span class="delete">24</span></td><td> </td><td class="rblock">     C.7.  Since draft-ietf-httpbis-p4-conditional-05 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
175      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.8.  Since draft-ietf-httpbis-p4-conditional-06 . . . . . . . . <span class="delete">24</span></td><td> </td><td class="rblock">     C.8.  Since draft-ietf-httpbis-p4-conditional-06 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
176      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.9.  Since draft-ietf-httpbis-p4-conditional-07 . . . . . . . . <span class="delete">24</span></td><td> </td><td class="rblock">     C.9.  Since draft-ietf-httpbis-p4-conditional-07 . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
177      <tr><td class="lineno" valign="top"></td><td class="left">     C.10. Since draft-ietf-httpbis-p4-conditional-08 . . . . . . . . 25</td><td> </td><td class="right">     C.10. Since draft-ietf-httpbis-p4-conditional-08 . . . . . . . . 25</td><td class="lineno" valign="top"></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="left">     C.11. Since draft-ietf-httpbis-p4-conditional-09 . . . . . . . . 25</td><td> </td><td class="right">     C.11. Since draft-ietf-httpbis-p4-conditional-09 . . . . . . . . 25</td><td class="lineno" valign="top"></td></tr>
179      <tr><td class="lineno" valign="top"></td><td class="left">     C.12. Since draft-ietf-httpbis-p4-conditional-10 . . . . . . . . 25</td><td> </td><td class="right">     C.12. Since draft-ietf-httpbis-p4-conditional-10 . . . . . . . . 25</td><td class="lineno" valign="top"></td></tr>
180      <tr><td><a name="diff0015" /></td></tr>
181      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.13. Since draft-ietf-httpbis-p4-conditional-11 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.13. Since draft-ietf-httpbis-p4-conditional-11 . . . . . . . . <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.14. Since draft-ietf-httpbis-p4-conditional-12 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.14. Since draft-ietf-httpbis-p4-conditional-12 . . . . . . . . <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
183      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.15. Since draft-ietf-httpbis-p4-conditional-13 . . . . . . . . <span class="delete">25</span></td><td> </td><td class="rblock">     C.15. Since draft-ietf-httpbis-p4-conditional-13 . . . . . . . . <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
184      <tr><td class="lineno" valign="top"></td><td class="left">     C.16. Since draft-ietf-httpbis-p4-conditional-14 . . . . . . . . 26</td><td> </td><td class="right">     C.16. Since draft-ietf-httpbis-p4-conditional-14 . . . . . . . . 26</td><td class="lineno" valign="top"></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="left">     C.17. Since draft-ietf-httpbis-p4-conditional-15 . . . . . . . . 26</td><td> </td><td class="right">     C.17. Since draft-ietf-httpbis-p4-conditional-15 . . . . . . . . 26</td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="left">     C.18. Since draft-ietf-httpbis-p4-conditional-16 . . . . . . . . 26</td><td> </td><td class="right">     C.18. Since draft-ietf-httpbis-p4-conditional-16 . . . . . . . . 26</td><td class="lineno" valign="top"></td></tr>
187      <tr><td><a name="diff0016" /></td></tr>
188      <tr><td class="lineno" valign="top"></td><td class="lblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">26</span></td><td> </td><td class="rblock">     <span class="insert">C.19. Since draft-ietf-httpbis-p4-conditional-17 . . . . . . . . 27</span></td><td class="lineno" valign="top"></td></tr>
189      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">27</span></td><td class="lineno" valign="top"></td></tr>
190      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
191      <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>
192      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
193      <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>
194      <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>
195      <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>
196      <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>
197      <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>
198      <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>
199      <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>
200      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
201      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 6, line 34</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 6, line 34</em></th><td></td></tr>
202      <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>
203      <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>
204      <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>
205      <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>
206      <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>
207      <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>
208      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
209      <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>
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">     OWS           = &lt;OWS, defined in [Part1], Section 1.2.2&gt;</td><td> </td><td class="right">     OWS           = &lt;OWS, defined in [Part1], Section 1.2.2&gt;</td><td class="lineno" valign="top"></td></tr>
212      <tr><td><a name="diff0017" /></td></tr>
213      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">quoted-string = &lt;quoted-string</span>, defined in [Part1], Section 3.2.3&gt;</td><td> </td><td class="rblock">     <span class="insert">obs-text      = &lt;obs-text</span>, defined in [Part1], Section 3.2.3&gt;</td><td class="lineno" valign="top"></td></tr>
214      <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>
215      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="left">2.  Validators</td><td> </td><td class="right">2.  Validators</td><td class="lineno" valign="top"></td></tr>
217      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
218      <tr><td class="lineno" valign="top"></td><td class="left">   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>
219      <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>
220      <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>
221      <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>
222      <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>
223      <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>
224      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
225      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 10, line 47</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 10, line 47</em></th><td></td></tr>
226      <tr><td class="lineno" valign="top"></td><td class="left">   resource, regardless of whether those multiple representations are</td><td> </td><td class="right">   resource, regardless of whether those multiple representations are</td><td class="lineno" valign="top"></td></tr>
227      <tr><td class="lineno" valign="top"></td><td class="left">   due to resource state changes over time, content negotiation</td><td> </td><td class="right">   due to resource state changes over time, content negotiation</td><td class="lineno" valign="top"></td></tr>
228      <tr><td class="lineno" valign="top"></td><td class="left">   resulting in multiple representations being valid at the same time,</td><td> </td><td class="right">   resulting in multiple representations being valid at the same time,</td><td class="lineno" valign="top"></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="left">   or both.  An entity-tag consists of an opaque quoted string, possibly</td><td> </td><td class="right">   or both.  An entity-tag consists of an opaque quoted string, possibly</td><td class="lineno" valign="top"></td></tr>
230      <tr><td class="lineno" valign="top"></td><td class="left">   prefixed by a weakness indicator.</td><td> </td><td class="right">   prefixed by a weakness indicator.</td><td class="lineno" valign="top"></td></tr>
231      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
232      <tr><td class="lineno" valign="top"></td><td class="left">     ETag       = entity-tag</td><td> </td><td class="right">     ETag       = entity-tag</td><td class="lineno" valign="top"></td></tr>
233      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
234      <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>
235      <tr><td class="lineno" valign="top"></td><td class="left">     weak       = %x57.2F ; "W/", case-sensitive</td><td> </td><td class="right">     weak       = %x57.2F ; "W/", case-sensitive</td><td class="lineno" valign="top"></td></tr>
236      <tr><td><a name="diff0018" /></td></tr>
237      <tr><td class="lineno" valign="top"></td><td class="lblock">     opaque-tag = quoted-string</td><td> </td><td class="rblock">     opaque-tag = <span class="insert">DQUOTE *etagc DQUOTE</span></td><td class="lineno" valign="top"></td></tr>
238      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     etagc      = %x21 / %x23-7E / obs-text</span></td><td class="lineno" valign="top"></td></tr>
239      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">                ; VCHAR except double quotes, plus obs-text</span></td><td class="lineno" valign="top"></td></tr>
240      <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>
241      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      Note: Previously, opaque-tag was defined to be a</span> quoted-string</td><td class="lineno" valign="top"></td></tr>
242      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">      <span class="insert">([RFC2616], Section 3.11), thus some recipients might perform</span></td><td class="lineno" valign="top"></td></tr>
243      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      backslash unescaping.  Servers therefore ought to avoid backslash</span></td><td class="lineno" valign="top"></td></tr>
244      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      characters in entity tags.</span></td><td class="lineno" valign="top"></td></tr>
245      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="left">   An entity-tag can be more reliable for validation than a modification</td><td> </td><td class="right">   An entity-tag can be more reliable for validation than a modification</td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left">   date in situations where it is inconvenient to store modification</td><td> </td><td class="right">   date in situations where it is inconvenient to store modification</td><td class="lineno" valign="top"></td></tr>
248      <tr><td class="lineno" valign="top"></td><td class="left">   dates, where the one-second resolution of HTTP date values is not</td><td> </td><td class="right">   dates, where the one-second resolution of HTTP date values is not</td><td class="lineno" valign="top"></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="left">   sufficient, or where modification dates are not consistently</td><td> </td><td class="right">   sufficient, or where modification dates are not consistently</td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="left">   maintained.</td><td> </td><td class="right">   maintained.</td><td class="lineno" valign="top"></td></tr>
251      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
252      <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>
253      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
254      <tr><td class="lineno" valign="top"></td><td class="left">     ETag: "xyzzy"</td><td> </td><td class="right">     ETag: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
255      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
256      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 21, line 16</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 21, line 35</em></th><td></td></tr>
257      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
258      <tr><td class="lineno" valign="top"></td><td class="left">   See Section 11 of [Part1].</td><td> </td><td class="right">   See Section 11 of [Part1].</td><td class="lineno" valign="top"></td></tr>
259      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
260      <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>
261      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
262      <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>
263      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
264      <tr><td class="lineno" valign="top"></td><td class="left">   [Part1]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part1]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
266      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,</td><td class="lineno" valign="top"></td></tr>
267      <tr><td><a name="diff0019" /></td></tr>
268      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Message Parsing", <span class="delete">draft-ietf-httpbis-p1-messaging-17</span></td><td> </td><td class="rblock">              and Message Parsing", <span class="insert">draft-ietf-httpbis-p1-messaging-18</span></td><td class="lineno" valign="top"></td></tr>
269      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">October 2011.</span></td><td> </td><td class="rblock">              (work in progress), <span class="insert">January 2012.</span></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">   [Part2]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part2]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
272      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
273      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 2: Message</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 2: Message</td><td class="lineno" valign="top"></td></tr>
274      <tr><td><a name="diff0020" /></td></tr>
275      <tr><td class="lineno" valign="top"></td><td class="lblock">              Semantics", <span class="delete">draft-ietf-httpbis-p2-semantics-17</span> (work in</td><td> </td><td class="rblock">              Semantics", <span class="insert">draft-ietf-httpbis-p2-semantics-18</span> (work in</td><td class="lineno" valign="top"></td></tr>
276      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">October 2011.</span></td><td> </td><td class="rblock">              progress), <span class="insert">January 2012.</span></td><td class="lineno" valign="top"></td></tr>
277      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
278      <tr><td class="lineno" valign="top"></td><td class="left">   [Part3]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part3]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
279      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
280      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 3: Message Payload</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 3: Message Payload</td><td class="lineno" valign="top"></td></tr>
281      <tr><td><a name="diff0021" /></td></tr>
282      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Content Negotiation", <span class="delete">draft-ietf-httpbis-p3-payload-17</span></td><td> </td><td class="rblock">              and Content Negotiation", <span class="insert">draft-ietf-httpbis-p3-payload-18</span></td><td class="lineno" valign="top"></td></tr>
283      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">October 2011.</span></td><td> </td><td class="rblock">              (work in progress), <span class="insert">January 2012.</span></td><td class="lineno" valign="top"></td></tr>
284      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
285      <tr><td class="lineno" valign="top"></td><td class="left">   [Part5]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part5]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
286      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and</td><td class="lineno" valign="top"></td></tr>
288      <tr><td><a name="diff0022" /></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="lblock">              Partial Responses", <span class="delete">draft-ietf-httpbis-p5-range-17</span> (work</td><td> </td><td class="rblock">              Partial Responses", <span class="insert">draft-ietf-httpbis-p5-range-18</span> (work</td><td class="lineno" valign="top"></td></tr>
290      <tr><td class="lineno" valign="top"></td><td class="lblock">              in progress), <span class="delete">October 2011.</span></td><td> </td><td class="rblock">              in progress), <span class="insert">January 2012.</span></td><td class="lineno" valign="top"></td></tr>
291      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
292      <tr><td class="lineno" valign="top"></td><td class="left">   [Part6]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part6]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
293      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
294      <tr><td class="lineno" valign="top"></td><td class="left">              Nottingham, M., Ed., and J. Reschke, Ed., "HTTP/1.1, part</td><td> </td><td class="right">              Nottingham, M., Ed., and J. Reschke, Ed., "HTTP/1.1, part</td><td class="lineno" valign="top"></td></tr>
295      <tr><td><a name="diff0023" /></td></tr>
296      <tr><td class="lineno" valign="top"></td><td class="lblock">              6: Caching", <span class="delete">draft-ietf-httpbis-p6-cache-17</span> (work in</td><td> </td><td class="rblock">              6: Caching", <span class="insert">draft-ietf-httpbis-p6-cache-18</span> (work in</td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">October 2011.</span></td><td> </td><td class="rblock">              progress), <span class="insert">January 2012.</span></td><td class="lineno" valign="top"></td></tr>
298      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
299      <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>
300      <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>
301      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
302      <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>
303      <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>
304      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
305      <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>
306      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
307      <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>
308      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
309      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 22, line 18</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 22, line 37</em></th><td></td></tr>
310      <tr><td class="lineno" valign="top"></td><td class="left">              September 2004.</td><td> </td><td class="right">              September 2004.</td><td class="lineno" valign="top"></td></tr>
311      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
312      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC4918]  Dusseault, L., Ed., "HTTP Extensions for Web Distributed</td><td> </td><td class="right">   [RFC4918]  Dusseault, L., Ed., "HTTP Extensions for Web Distributed</td><td class="lineno" valign="top"></td></tr>
313      <tr><td class="lineno" valign="top"></td><td class="left">              Authoring and Versioning (WebDAV)", RFC 4918, June 2007.</td><td> </td><td class="right">              Authoring and Versioning (WebDAV)", RFC 4918, June 2007.</td><td class="lineno" valign="top"></td></tr>
314      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
315      <tr><td class="lineno" valign="top"></td><td class="left">Appendix A.  Changes from RFC 2616</td><td> </td><td class="right">Appendix A.  Changes from RFC 2616</td><td class="lineno" valign="top"></td></tr>
316      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="left">   Allow weak entity-tags in all requests except range requests</td><td> </td><td class="right">   Allow weak entity-tags in all requests except range requests</td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="left">   (Sections 2.1 and 3.2).</td><td> </td><td class="right">   (Sections 2.1 and 3.2).</td><td class="lineno" valign="top"></td></tr>
319      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
320      <tr><td><a name="diff0024" /></td></tr>
321      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">Change ETag header field ABNF not to use quoted-string, thus avoiding</span></td><td class="lineno" valign="top"></td></tr>
322      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   escaping issues.  (Section 2.3)</span></td><td class="lineno" valign="top"></td></tr>
323      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
324      <tr><td class="lineno" valign="top"></td><td class="left">   Change ABNF productions for header fields to only define the field</td><td> </td><td class="right">   Change ABNF productions for header fields to only define the field</td><td class="lineno" valign="top"></td></tr>
325      <tr><td class="lineno" valign="top"></td><td class="left">   value.  (Section 3)</td><td> </td><td class="right">   value.  (Section 3)</td><td class="lineno" valign="top"></td></tr>
326      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
327      <tr><td class="lineno" valign="top"></td><td class="left">Appendix B.  Collected ABNF</td><td> </td><td class="right">Appendix B.  Collected ABNF</td><td class="lineno" valign="top"></td></tr>
328      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
329      <tr><td class="lineno" valign="top"></td><td class="left">   ETag = entity-tag</td><td> </td><td class="right">   ETag = entity-tag</td><td class="lineno" valign="top"></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
331      <tr><td class="lineno" valign="top"></td><td class="left">   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>
332      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
333      <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>
334      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
335      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 22, line 39</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 23, line 23</em></th><td></td></tr>
336      <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>
337      <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>
338      <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>
339      <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>
340      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
341      <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>
342      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
343      <tr><td class="lineno" valign="top"></td><td class="left">   OWS = &lt;OWS, defined in [Part1], Section 1.2.2&gt;</td><td> </td><td class="right">   OWS = &lt;OWS, defined in [Part1], Section 1.2.2&gt;</td><td class="lineno" valign="top"></td></tr>
344      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
345      <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>
346      <tr><td><a name="diff0025" /></td></tr>
347      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">etagc = "!" / %x23-7E ; '#'-'~'</span></td><td class="lineno" valign="top"></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">    / obs-text</span></td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
350      <tr><td><a name="diff0026" /></td></tr>
351      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">opaque-tag = quoted-string</span></td><td> </td><td class="rblock">   <span class="insert">obs-text</span> = <span class="insert">&lt;obs-text,</span> defined in [Part1], Section 3.2.3&gt;</td><td class="lineno" valign="top"></td></tr>
352      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock">   <span class="insert">opaque-tag = DQUOTE *etagc DQUOTE</span></td><td class="lineno" valign="top"></td></tr>
353      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   quoted-string</span> = <span class="delete">&lt;quoted-string,</span> defined in [Part1], Section 3.2.3&gt;</td><td> </td><td class="rblock"></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">   weak = %x57.2F ; W/</td><td> </td><td class="right">   weak = %x57.2F ; W/</td><td class="lineno" valign="top"></td></tr>
356      <tr><td><a name="diff0027" /></td></tr>
357      <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>
358      <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>
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">   ; ETag defined but not used</td><td> </td><td class="right">   ; ETag defined but not used</td><td class="lineno" valign="top"></td></tr>
361      <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>
362      <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>
363      <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>
364      <tr><td class="lineno" valign="top"></td><td class="left">   ; If-Unmodified-Since defined but not used</td><td> </td><td class="right">   ; If-Unmodified-Since defined but not used</td><td class="lineno" valign="top"></td></tr>
365      <tr><td class="lineno" valign="top"></td><td class="left">   ; Last-Modified defined but not used</td><td> </td><td class="right">   ; Last-Modified defined but not used</td><td class="lineno" valign="top"></td></tr>
366      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
367      <tr><td class="lineno" valign="top"></td><td class="left">Appendix C.  Change Log (to be removed by RFC Editor before publication)</td><td> </td><td class="right">Appendix C.  Change Log (to be removed by RFC Editor before publication)</td><td class="lineno" valign="top"></td></tr>
368      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
369      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 26, line 27</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 27, line 5</em></th><td></td></tr>
370      <tr><td class="lineno" valign="top"></td><td class="left">      should be listed when dicussing contexts where L-M can be</td><td> </td><td class="right">      should be listed when dicussing contexts where L-M can be</td><td class="lineno" valign="top"></td></tr>
371      <tr><td class="lineno" valign="top"></td><td class="left">      considered strong"</td><td> </td><td class="right">      considered strong"</td><td class="lineno" valign="top"></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="left">C.18.  Since draft-ietf-httpbis-p4-conditional-16</td><td> </td><td class="right">C.18.  Since draft-ietf-httpbis-p4-conditional-16</td><td class="lineno" valign="top"></td></tr>
374      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
375      <tr><td class="lineno" valign="top"></td><td class="left">   Closed issues:</td><td> </td><td class="right">   Closed issues:</td><td class="lineno" valign="top"></td></tr>
376      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
377      <tr><td class="lineno" valign="top"></td><td class="left">   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>
378      <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>
379      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
380      <tr><td><a name="diff0028" /></td></tr>
381      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">C.19.  Since draft-ietf-httpbis-p4-conditional-17</span></td><td class="lineno" valign="top"></td></tr>
382      <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>
383      <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>
384      <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>
385      <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/306&gt;: "does etag</span></td><td class="lineno" valign="top"></td></tr>
386      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      value really use quoted-string"</span></td><td class="lineno" valign="top"></td></tr>
387      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
388      <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>
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">   3</td><td> </td><td class="right">   3</td><td class="lineno" valign="top"></td></tr>
391      <tr><td class="lineno" valign="top"></td><td class="left">      304 Not Modified (status code)  19</td><td> </td><td class="right">      304 Not Modified (status code)  19</td><td class="lineno" valign="top"></td></tr>
392      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
393      <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>
394      <tr><td class="lineno" valign="top"></td><td class="left">      412 Precondition Failed (status code)  20</td><td> </td><td class="right">      412 Precondition Failed (status code)  20</td><td class="lineno" valign="top"></td></tr>
395      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
396      <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>
397      <tr><td class="lineno" valign="top"></td><td class="left">      ETag header field  10</td><td> </td><td class="right">      ETag header field  10</td><td class="lineno" valign="top"></td></tr>
398      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
399      <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>
400      <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>
401      <tr><td class="lineno" valign="top"></td><td class="left">         entity-tag  10</td><td> </td><td class="right">         entity-tag  10</td><td class="lineno" valign="top"></td></tr>
402      <tr><td class="lineno" valign="top"></td><td class="left">         ETag  10</td><td> </td><td class="right">         ETag  10</td><td class="lineno" valign="top"></td></tr>
403      <tr><td><a name="diff0029" /></td></tr>
404      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">         etagc  10</span></td><td class="lineno" valign="top"></td></tr>
405      <tr><td class="lineno" valign="top"></td><td class="left">         If-Match  15</td><td> </td><td class="right">         If-Match  15</td><td class="lineno" valign="top"></td></tr>
406      <tr><td class="lineno" valign="top"></td><td class="left">         If-Modified-Since  17</td><td> </td><td class="right">         If-Modified-Since  17</td><td class="lineno" valign="top"></td></tr>
407      <tr><td class="lineno" valign="top"></td><td class="left">         If-None-Match  16</td><td> </td><td class="right">         If-None-Match  16</td><td class="lineno" valign="top"></td></tr>
408      <tr><td class="lineno" valign="top"></td><td class="left">         If-Unmodified-Since  18</td><td> </td><td class="right">         If-Unmodified-Since  18</td><td class="lineno" valign="top"></td></tr>
409      <tr><td class="lineno" valign="top"></td><td class="left">         Last-Modified  8</td><td> </td><td class="right">         Last-Modified  8</td><td class="lineno" valign="top"></td></tr>
410      <tr><td class="lineno" valign="top"></td><td class="left">         opaque-tag  10</td><td> </td><td class="right">         opaque-tag  10</td><td class="lineno" valign="top"></td></tr>
411      <tr><td class="lineno" valign="top"></td><td class="left">         weak  10</td><td> </td><td class="right">         weak  10</td><td class="lineno" valign="top"></td></tr>
412      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
413      <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>
414      <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>
415      <tr><td class="lineno" valign="top"></td><td class="left">         ETag  10</td><td> </td><td class="right">         ETag  10</td><td class="lineno" valign="top"></td></tr>
416      <tr><td class="lineno" valign="top"></td><td class="left">         If-Match  15</td><td> </td><td class="right">         If-Match  15</td><td class="lineno" valign="top"></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="left">         If-Modified-Since  17</td><td> </td><td class="right">         If-Modified-Since  17</td><td class="lineno" valign="top"></td></tr>
418      <tr><td><a name="diff0030" /></td></tr>
419      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-None-Match  1<span class="delete">5</span></td><td> </td><td class="rblock">         If-None-Match  1<span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
420      <tr><td class="lineno" valign="top"></td><td class="left">         If-Unmodified-Since  18</td><td> </td><td class="right">         If-Unmodified-Since  18</td><td class="lineno" valign="top"></td></tr>
421      <tr><td class="lineno" valign="top"></td><td class="left">         Last-Modified  8</td><td> </td><td class="right">         Last-Modified  8</td><td class="lineno" valign="top"></td></tr>
422      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
423      <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>
424      <tr><td class="lineno" valign="top"></td><td class="left">      If-Match header field  15</td><td> </td><td class="right">      If-Match header field  15</td><td class="lineno" valign="top"></td></tr>
425      <tr><td class="lineno" valign="top"></td><td class="left">      If-Modified-Since header field  17</td><td> </td><td class="right">      If-Modified-Since header field  17</td><td class="lineno" valign="top"></td></tr>
426      <tr><td><a name="diff0031" /></td></tr>
427      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-None-Match header field  1<span class="delete">5</span></td><td> </td><td class="rblock">      If-None-Match header field  1<span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
428      <tr><td class="lineno" valign="top"></td><td class="left">      If-Unmodified-Since header field  18</td><td> </td><td class="right">      If-Unmodified-Since header field  18</td><td class="lineno" valign="top"></td></tr>
429      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
430      <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>
431      <tr><td class="lineno" valign="top"></td><td class="left">      Last-Modified header field  8</td><td> </td><td class="right">      Last-Modified header field  8</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 class="lineno" valign="top"></td><td class="left">   M</td><td> </td><td class="right">   M</td><td class="lineno" valign="top"></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="left">      metadata  6</td><td> </td><td class="right">      metadata  6</td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
436      <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>
437      <tr><td class="lineno" valign="top"></td><td class="left">      selected representation  5</td><td> </td><td class="right">      selected representation  5</td><td class="lineno" valign="top"></td></tr>
438
439     <tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
440     <tr bgcolor="gray"><th colspan="5" align="center"><a name="end">&nbsp;End of changes. 31 change blocks.&nbsp;</a></th></tr>
441     <tr class="stats"><td></td><th><i>38 lines changed or deleted</i></th><th><i> </i></th><th><i>59 lines changed or added</i></th><td></td></tr>
442     <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>
443   </table>
444   </body>
445   </html>
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