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40<body > 
41  <table border="0" cellpadding="0" cellspacing="0"> 
42  <tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p4-conditional-02.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p4-conditional-03.txt&nbsp;</th><th></th></tr> 
43      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
44      <tr><td class="lineno" valign="top"></td><td class="left">Network Working Group                                   R. Fielding, Ed.</td><td> </td><td class="right">Network Working Group                                   R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="left">Internet-Draft                                              Day Software</td><td> </td><td class="right">Internet-Draft                                              Day Software</td><td class="lineno" valign="top"></td></tr>
46      <tr><td 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>
47      <tr><td class="lineno" valign="top"></td><td class="left">Intended status: Standards Track                    One Laptop per Child</td><td> </td><td class="right">Intended status: Standards Track                    One Laptop per Child</td><td class="lineno" valign="top"></td></tr>
48      <tr><td><a name="diff0001" /></td></tr>
49      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">August 27, 2008  </span>                                      J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">December 19, 2008</span>                                      J. Mogul</td><td class="lineno" valign="top"></td></tr>
50      <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>
51      <tr><td class="lineno" valign="top"></td><td class="left">                                                              H. Frystyk</td><td> </td><td class="right">                                                              H. Frystyk</td><td class="lineno" valign="top"></td></tr>
52      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
53      <tr><td class="lineno" valign="top"></td><td class="left">                                                             L. Masinter</td><td> </td><td class="right">                                                             L. Masinter</td><td class="lineno" valign="top"></td></tr>
54      <tr><td class="lineno" valign="top"></td><td class="left">                                                           Adobe Systems</td><td> </td><td class="right">                                                           Adobe Systems</td><td class="lineno" valign="top"></td></tr>
55      <tr><td class="lineno" valign="top"></td><td class="left">                                                                P. Leach</td><td> </td><td class="right">                                                                P. Leach</td><td class="lineno" valign="top"></td></tr>
56      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
57      <tr><td class="lineno" valign="top"></td><td class="left">                                                          T. Berners-Lee</td><td> </td><td class="right">                                                          T. Berners-Lee</td><td class="lineno" valign="top"></td></tr>
58      <tr><td class="lineno" valign="top"></td><td class="left">                                                                 W3C/MIT</td><td> </td><td class="right">                                                                 W3C/MIT</td><td class="lineno" valign="top"></td></tr>
59      <tr><td 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>
60      <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>
61      <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>
62      <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>
63      <tr><td><a name="diff0002" /></td></tr>
64      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                       <span class="delete">February 24</span>, 2008</td><td> </td><td class="rblock">                                                       <span class="insert">    June 17</span>, 2008</td><td class="lineno" valign="top"></td></tr>
65      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
66      <tr><td class="lineno" valign="top"></td><td class="left">                 HTTP/1.1, part 4: Conditional Requests</td><td> </td><td class="right">                 HTTP/1.1, part 4: Conditional Requests</td><td class="lineno" valign="top"></td></tr>
67      <tr><td><a name="diff0003" /></td></tr>
68      <tr><td class="lineno" valign="top"></td><td class="lblock">                  draft-ietf-httpbis-p4-conditional-0<span class="delete">2</span></td><td> </td><td class="rblock">                  draft-ietf-httpbis-p4-conditional-0<span class="insert">3</span></td><td class="lineno" valign="top"></td></tr>
69      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
70      <tr><td class="lineno" valign="top"></td><td class="left">Status of this Memo</td><td> </td><td class="right">Status of this Memo</td><td class="lineno" valign="top"></td></tr>
71      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
72      <tr><td class="lineno" valign="top"></td><td class="left">   By submitting this Internet-Draft, each author represents that any</td><td> </td><td class="right">   By submitting this Internet-Draft, each author represents that any</td><td class="lineno" valign="top"></td></tr>
73      <tr><td class="lineno" valign="top"></td><td class="left">   applicable patent or other IPR claims of which he or she is aware</td><td> </td><td class="right">   applicable patent or other IPR claims of which he or she is aware</td><td class="lineno" valign="top"></td></tr>
74      <tr><td class="lineno" valign="top"></td><td class="left">   have been or will be disclosed, and any of which he or she becomes</td><td> </td><td class="right">   have been or will be disclosed, and any of which he or she becomes</td><td class="lineno" valign="top"></td></tr>
75      <tr><td class="lineno" valign="top"></td><td class="left">   aware will be disclosed, in accordance with Section 6 of BCP 79.</td><td> </td><td class="right">   aware will be disclosed, in accordance with Section 6 of BCP 79.</td><td class="lineno" valign="top"></td></tr>
76      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
77      <tr><td class="lineno" valign="top"></td><td class="left">   Internet-Drafts are working documents of the Internet Engineering</td><td> </td><td class="right">   Internet-Drafts are working documents of the Internet Engineering</td><td class="lineno" valign="top"></td></tr>
78      <tr><td class="lineno" valign="top"></td><td class="left">   Task Force (IETF), its areas, and its working groups.  Note that</td><td> </td><td class="right">   Task Force (IETF), its areas, and its working groups.  Note that</td><td class="lineno" valign="top"></td></tr>
79      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
80      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 1, line 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>
81      <tr><td class="lineno" valign="top"></td><td class="left">   and may be updated, replaced, or obsoleted by other documents at any</td><td> </td><td class="right">   and may be updated, replaced, or obsoleted by other documents at any</td><td class="lineno" valign="top"></td></tr>
82      <tr><td class="lineno" valign="top"></td><td class="left">   time.  It is inappropriate to use Internet-Drafts as reference</td><td> </td><td class="right">   time.  It is inappropriate to use Internet-Drafts as reference</td><td class="lineno" valign="top"></td></tr>
83      <tr><td class="lineno" valign="top"></td><td class="left">   material or to cite them other than as "work in progress."</td><td> </td><td class="right">   material or to cite them other than as "work in progress."</td><td class="lineno" valign="top"></td></tr>
84      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
85      <tr><td class="lineno" valign="top"></td><td class="left">   The list of current Internet-Drafts can be accessed at</td><td> </td><td class="right">   The list of current Internet-Drafts can be accessed at</td><td class="lineno" valign="top"></td></tr>
86      <tr><td class="lineno" valign="top"></td><td class="left">   http://www.ietf.org/ietf/1id-abstracts.txt.</td><td> </td><td class="right">   http://www.ietf.org/ietf/1id-abstracts.txt.</td><td class="lineno" valign="top"></td></tr>
87      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
88      <tr><td class="lineno" valign="top"></td><td class="left">   The list of Internet-Draft Shadow Directories can be accessed at</td><td> </td><td class="right">   The list of Internet-Draft Shadow Directories can be accessed at</td><td class="lineno" valign="top"></td></tr>
89      <tr><td class="lineno" valign="top"></td><td class="left">   http://www.ietf.org/shadow.html.</td><td> </td><td class="right">   http://www.ietf.org/shadow.html.</td><td class="lineno" valign="top"></td></tr>
90      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
91      <tr><td><a name="diff0004" /></td></tr>
92      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on <span class="delete">August 27</span>, 2008.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">December 19</span>, 2008.</td><td class="lineno" valign="top"></td></tr>
93      <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>
94      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">Copyright Notice</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
95      <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>
96      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Copyright (C) The IETF Trust (2008).</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
97      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
98      <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>
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">   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>
101      <tr><td class="lineno" valign="top"></td><td class="left">   protocol for distributed, collaborative, hypermedia information</td><td> </td><td class="right">   protocol for distributed, collaborative, hypermedia information</td><td class="lineno" valign="top"></td></tr>
102      <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>
103      <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>
104      <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>
105      <tr><td class="lineno" valign="top"></td><td class="left">   "HTTP/1.1" and, taken together, obsoletes RFC 2616.  Part 4 defines</td><td> </td><td class="right">   "HTTP/1.1" and, taken together, obsoletes RFC 2616.  Part 4 defines</td><td class="lineno" valign="top"></td></tr>
106      <tr><td class="lineno" valign="top"></td><td class="left">   request header fields for indicating conditional requests and the</td><td> </td><td class="right">   request header fields for indicating conditional requests and the</td><td class="lineno" valign="top"></td></tr>
107      <tr><td class="lineno" valign="top"></td><td class="left">   rules for constructing responses to those requests.</td><td> </td><td class="right">   rules for constructing responses to those requests.</td><td class="lineno" valign="top"></td></tr>
108      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
109      <tr><td class="lineno" valign="top"></td><td class="left">Editorial Note (To be removed by RFC Editor)</td><td> </td><td class="right">Editorial Note (To be removed by RFC Editor)</td><td class="lineno" valign="top"></td></tr>
110      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
111      <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>
112      <tr><td class="lineno" valign="top"></td><td class="left">   group mailing list (ietf-http-wg@w3.org).  The current issues list is</td><td> </td><td class="right">   group mailing list (ietf-http-wg@w3.org).  The current issues list is</td><td class="lineno" valign="top"></td></tr>
113      <tr><td class="lineno" valign="top"></td><td class="left">   at &lt;http://www.tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td> </td><td class="right">   at &lt;http://www.tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td class="lineno" valign="top"></td></tr>
114      <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>
115      <tr><td class="lineno" valign="top"></td><td class="left">   &lt;http://www.tools.ietf.org/wg/httpbis/&gt;.</td><td> </td><td class="right">   &lt;http://www.tools.ietf.org/wg/httpbis/&gt;.</td><td class="lineno" valign="top"></td></tr>
116      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
117      <tr><td><a name="diff0005" /></td></tr>
118      <tr><td class="lineno" valign="top"></td><td class="lblock">   Th<span class="delete">is draft incorporates those issue resolutions that were either</span></td><td> </td><td class="rblock">   Th<span class="insert">e changes in this draft are summarized in Appendix B.4.</span></td><td class="lineno" valign="top"></td></tr>
119      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   collected in the original RFC2616 errata list</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
120      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   (&lt;http://purl.org/NET/http-errata&gt;), or which were agreed upon on the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
121      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   mailing list between October 2006 and November 2007 (as published in</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
122      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   "draft-lafon-rfc2616bis-03").</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
124      <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>
125      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
126      <tr><td class="lineno" valign="top"></td><td class="left">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4</td><td> </td><td class="right">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4</td><td class="lineno" valign="top"></td></tr>
127      <tr><td class="lineno" valign="top"></td><td class="left">     1.1.  Requirements . . . . . . . . . . . . . . . . . . . . . . .  4</td><td> </td><td class="right">     1.1.  Requirements . . . . . . . . . . . . . . . . . . . . . . .  4</td><td class="lineno" valign="top"></td></tr>
128      <tr><td class="lineno" valign="top"></td><td class="left">   2.  Notational Conventions and Generic Grammar . . . . . . . . . .  4</td><td> </td><td class="right">   2.  Notational Conventions and Generic Grammar . . . . . . . . . .  4</td><td class="lineno" valign="top"></td></tr>
129      <tr><td class="lineno" valign="top"></td><td class="left">   3.  Entity Tags  . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td> </td><td class="right">   3.  Entity Tags  . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
130      <tr><td class="lineno" valign="top"></td><td class="left">   4.  Status Code Definitions  . . . . . . . . . . . . . . . . . . .  5</td><td> </td><td class="right">   4.  Status Code Definitions  . . . . . . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
131      <tr><td class="lineno" valign="top"></td><td class="left">     4.1.  304 Not Modified . . . . . . . . . . . . . . . . . . . . .  5</td><td> </td><td class="right">     4.1.  304 Not Modified . . . . . . . . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="left">     4.2.  412 Precondition Failed  . . . . . . . . . . . . . . . . .  6</td><td> </td><td class="right">     4.2.  412 Precondition Failed  . . . . . . . . . . . . . . . . .  6</td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="left">   5.  Weak and Strong Validators . . . . . . . . . . . . . . . . . .  6</td><td> </td><td class="right">   5.  Weak and Strong Validators . . . . . . . . . . . . . . . . . .  6</td><td class="lineno" valign="top"></td></tr>
134      <tr><td class="lineno" valign="top"></td><td class="left">   6.  Rules for When to Use Entity Tags and Last-Modified Dates  . .  9</td><td> </td><td class="right">   6.  Rules for When to Use Entity Tags and Last-Modified Dates  . .  9</td><td class="lineno" valign="top"></td></tr>
135      <tr><td class="lineno" valign="top"></td><td class="left">   7.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="right">   7.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
136      <tr><td class="lineno" valign="top"></td><td class="left">     7.1.  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="right">     7.1.  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
137      <tr><td><a name="diff0006" /></td></tr>
138      <tr><td class="lineno" valign="top"></td><td class="lblock">     7.2.  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 1<span class="delete">2</span></td><td> </td><td class="rblock">     7.2.  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 1<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
139      <tr><td class="lineno" valign="top"></td><td class="left">     7.3.  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . 13</td><td> </td><td class="right">     7.3.  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . 13</td><td class="lineno" valign="top"></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="left">     7.4.  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . 14</td><td> </td><td class="right">     7.4.  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
141      <tr><td><a name="diff0007" /></td></tr>
142      <tr><td class="lineno" valign="top"></td><td class="lblock">     7.5.  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . 1<span class="delete">6</span></td><td> </td><td class="rblock">     7.5.  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . 1<span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
143      <tr><td class="lineno" valign="top"></td><td class="left">     7.6.  Last-Modified  . . . . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="right">     7.6.  Last-Modified  . . . . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="left">   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
145      <tr><td><a name="diff0008" /></td></tr>
146      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     8.1.  Message Header Registration  . . . . . . . . . . . . . . . 17</span></td><td class="lineno" valign="top"></td></tr>
147      <tr><td class="lineno" valign="top"></td><td class="left">   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">   9.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="left">   10. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">   10. Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
149      <tr><td><a name="diff0009" /></td></tr>
150      <tr><td class="lineno" valign="top"></td><td class="lblock">   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 1<span class="delete">7</span></td><td> </td><td class="rblock">   11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 1<span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
151      <tr><td class="lineno" valign="top"></td><td class="lblock">     11.1. Normative References . . . . . . . . . . . . . . . . . . . 1<span class="delete">7</span></td><td> </td><td class="rblock">     11.1. Normative References . . . . . . . . . . . . . . . . . . . 1<span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
152      <tr><td class="lineno" valign="top"></td><td class="left">     11.2. Informative References . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right">     11.2. Informative References . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
153      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix A.  Compatibility with Previous Versions  . . . . . . . . 18</td><td> </td><td class="right">   Appendix A.  Compatibility with Previous Versions  . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
154      <tr><td class="lineno" valign="top"></td><td class="left">     A.1.  Changes from RFC 2616  . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right">     A.1.  Changes from RFC 2616  . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix B.  Change Log (to be removed by RFC Editor before</td><td> </td><td class="right">   Appendix B.  Change Log (to be removed by RFC Editor before</td><td class="lineno" valign="top"></td></tr>
156      <tr><td><a name="diff0010" /></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="lblock">                publication)  . . . . . . . . . . . . . . . . . . . . 1<span class="delete">8</span></td><td> </td><td class="rblock">                publication)  . . . . . . . . . . . . . . . . . . . . 1<span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno" valign="top"></td><td class="lblock">     B.1.  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . 1<span class="delete">8</span></td><td> </td><td class="rblock">     B.1.  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . 1<span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
159      <tr><td class="lineno" valign="top"></td><td class="lblock">     B.2.  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 1<span class="delete">8</span></td><td> </td><td class="rblock">     B.2.  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 1<span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
160      <tr><td class="lineno" valign="top"></td><td class="lblock">     B.3.  Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 1<span class="delete">8</span></td><td> </td><td class="rblock">     B.3.  Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 1<span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
161      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     B.4.  Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . 19</span></td><td class="lineno" valign="top"></td></tr>
162      <tr><td class="lineno" valign="top"></td><td class="left">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19</td><td> </td><td class="right">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="left">   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 20</td><td> </td><td class="right">   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
164      <tr><td><a name="diff0011" /></td></tr>
165      <tr><td class="lineno" valign="top"></td><td class="lblock">   Intellectual Property and Copyright Statements . . . . . . . . . . 2<span class="delete">3</span></td><td> </td><td class="rblock">   Intellectual Property and Copyright Statements . . . . . . . . . . 2<span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
167      <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>
168      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="left">   This document defines HTTP/1.1 response metadata for indicating</td><td> </td><td class="right">   This document defines HTTP/1.1 response metadata for indicating</td><td class="lineno" valign="top"></td></tr>
170      <tr><td class="lineno" valign="top"></td><td class="left">   potential changes to payload content, including modification time</td><td> </td><td class="right">   potential changes to payload content, including modification time</td><td class="lineno" valign="top"></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="left">   stamps and opaque entity-tags, and the HTTP conditional request</td><td> </td><td class="right">   stamps and opaque entity-tags, and the HTTP conditional request</td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="left">   mechanisms that allow preconditions to be placed on a request method.</td><td> </td><td class="right">   mechanisms that allow preconditions to be placed on a request method.</td><td class="lineno" valign="top"></td></tr>
173      <tr><td class="lineno" valign="top"></td><td class="left">   Conditional GET requests allow for efficient cache updates.  Other</td><td> </td><td class="right">   Conditional GET requests allow for efficient cache updates.  Other</td><td class="lineno" valign="top"></td></tr>
174      <tr><td class="lineno" valign="top"></td><td class="left">   conditional request methods are used to protect against overwriting</td><td> </td><td class="right">   conditional request methods are used to protect against overwriting</td><td class="lineno" valign="top"></td></tr>
175      <tr><td class="lineno" valign="top"></td><td class="left">   or misunderstanding the state of a resource that has been changed</td><td> </td><td class="right">   or misunderstanding the state of a resource that has been changed</td><td class="lineno" valign="top"></td></tr>
176      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
177      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 7, line 40</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 7, line 40</em></th><td></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="left">   and includes the validator in a validating header field, or when a</td><td> </td><td class="right">   and includes the validator in a validating header field, or when a</td><td class="lineno" valign="top"></td></tr>
179      <tr><td class="lineno" valign="top"></td><td class="left">   server compares two validators.</td><td> </td><td class="right">   server compares two validators.</td><td class="lineno" valign="top"></td></tr>
180      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
181      <tr><td class="lineno" valign="top"></td><td class="left">   Strong validators are usable in any context.  Weak validators are</td><td> </td><td class="right">   Strong validators are usable in any context.  Weak validators are</td><td class="lineno" valign="top"></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="left">   only usable in contexts that do not depend on exact equality of an</td><td> </td><td class="right">   only usable in contexts that do not depend on exact equality of an</td><td class="lineno" valign="top"></td></tr>
183      <tr><td class="lineno" valign="top"></td><td class="left">   entity.  For example, either kind is usable for a conditional GET of</td><td> </td><td class="right">   entity.  For example, either kind is usable for a conditional GET of</td><td class="lineno" valign="top"></td></tr>
184      <tr><td class="lineno" valign="top"></td><td class="left">   a full entity.  However, only a strong validator is usable for a sub-</td><td> </td><td class="right">   a full entity.  However, only a strong validator is usable for a sub-</td><td class="lineno" valign="top"></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="left">   range retrieval, since otherwise the client might end up with an</td><td> </td><td class="right">   range retrieval, since otherwise the client might end up with an</td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="left">   internally inconsistent entity.</td><td> </td><td class="right">   internally inconsistent entity.</td><td class="lineno" valign="top"></td></tr>
187      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
188      <tr><td><a name="diff0012" /></td></tr>
189      <tr><td class="lineno" valign="top"></td><td class="lblock">   Clients M<span class="delete">AY issue simple (non-subrange) GET requests with either weak</span></td><td> </td><td class="rblock">   Clients M<span class="insert">UST NOT use weak validators in range requests ([Part5]).</span></td><td class="lineno" valign="top"></td></tr>
190      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   validators or strong validators.  Clients MUST NOT use weak</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
191      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   validators in other forms of request.</span></td><td> </td><td class="rblock"></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">   The only function that HTTP/1.1 defines on validators is comparison.</td><td> </td><td class="right">   The only function that HTTP/1.1 defines on validators is comparison.</td><td class="lineno" valign="top"></td></tr>
194      <tr><td class="lineno" valign="top"></td><td class="left">   There are two validator comparison functions, depending on whether</td><td> </td><td class="right">   There are two validator comparison functions, depending on whether</td><td class="lineno" valign="top"></td></tr>
195      <tr><td class="lineno" valign="top"></td><td class="left">   the comparison context allows the use of weak validators or not:</td><td> </td><td class="right">   the comparison context allows the use of weak validators or not:</td><td class="lineno" valign="top"></td></tr>
196      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
197      <tr><td class="lineno" valign="top"></td><td class="left">   o  The strong comparison function: in order to be considered equal,</td><td> </td><td class="right">   o  The strong comparison function: in order to be considered equal,</td><td class="lineno" valign="top"></td></tr>
198      <tr><td class="lineno" valign="top"></td><td class="left">      both validators MUST be identical in every way, and both MUST NOT</td><td> </td><td class="right">      both validators MUST be identical in every way, and both MUST NOT</td><td class="lineno" valign="top"></td></tr>
199      <tr><td class="lineno" valign="top"></td><td class="left">      be weak.</td><td> </td><td class="right">      be weak.</td><td class="lineno" valign="top"></td></tr>
200      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
201      <tr><td class="lineno" valign="top"></td><td class="left">   o  The weak comparison function: in order to be considered equal,</td><td> </td><td class="right">   o  The weak comparison function: in order to be considered equal,</td><td class="lineno" valign="top"></td></tr>
202      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
203      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 9, line 12</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 9, line 10</em></th><td></td></tr>
204      <tr><td class="lineno" valign="top"></td><td class="left">   Modified values are generated from different clocks, or at somewhat</td><td> </td><td class="right">   Modified values are generated from different clocks, or at somewhat</td><td class="lineno" valign="top"></td></tr>
205      <tr><td class="lineno" valign="top"></td><td class="left">   different times during the preparation of the response.  An</td><td> </td><td class="right">   different times during the preparation of the response.  An</td><td class="lineno" valign="top"></td></tr>
206      <tr><td class="lineno" valign="top"></td><td class="left">   implementation MAY use a value larger than 60 seconds, if it is</td><td> </td><td class="right">   implementation MAY use a value larger than 60 seconds, if it is</td><td class="lineno" valign="top"></td></tr>
207      <tr><td class="lineno" valign="top"></td><td class="left">   believed that 60 seconds is too short.</td><td> </td><td class="right">   believed that 60 seconds is too short.</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">   If a client wishes to perform a sub-range retrieval on a value for</td><td> </td><td class="right">   If a client wishes to perform a sub-range retrieval on a value for</td><td class="lineno" valign="top"></td></tr>
210      <tr><td class="lineno" valign="top"></td><td class="left">   which it has only a Last-Modified time and no opaque validator, it</td><td> </td><td class="right">   which it has only a Last-Modified time and no opaque validator, it</td><td class="lineno" valign="top"></td></tr>
211      <tr><td class="lineno" valign="top"></td><td class="left">   MAY do this only if the Last-Modified time is strong in the sense</td><td> </td><td class="right">   MAY do this only if the Last-Modified time is strong in the sense</td><td class="lineno" valign="top"></td></tr>
212      <tr><td class="lineno" valign="top"></td><td class="left">   described here.</td><td> </td><td class="right">   described here.</td><td class="lineno" valign="top"></td></tr>
213      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
214      <tr><td><a name="diff0013" /></td></tr>
215      <tr><td class="lineno" valign="top"></td><td class="lblock">   A cache or origin server receiving a conditional r<span class="delete">equest, other than</span></td><td> </td><td class="rblock">   A cache or origin server receiving a conditional r<span class="insert">ange request</span></td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">a full-body GET request, MUST use the strong comparison function to</span></td><td> </td><td class="rblock">   <span class="insert">([Part5]) MUST use the strong comparison function to evaluate the</span></td><td class="lineno" valign="top"></td></tr>
217      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">evaluate the </span>condition.</td><td> </td><td class="rblock">   condition.</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">   These rules allow HTTP/1.1 caches and clients to safely perform sub-</td><td> </td><td class="right">   These rules allow HTTP/1.1 caches and clients to safely perform sub-</td><td class="lineno" valign="top"></td></tr>
220      <tr><td class="lineno" valign="top"></td><td class="left">   range retrievals on values that have been obtained from HTTP/1.0</td><td> </td><td class="right">   range retrievals on values that have been obtained from HTTP/1.0</td><td class="lineno" valign="top"></td></tr>
221      <tr><td class="lineno" valign="top"></td><td class="left">   servers.</td><td> </td><td class="right">   servers.</td><td class="lineno" valign="top"></td></tr>
222      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
223      <tr><td class="lineno" valign="top"></td><td class="left">6.  Rules for When to Use Entity Tags and Last-Modified Dates</td><td> </td><td class="right">6.  Rules for When to Use Entity Tags and Last-Modified Dates</td><td class="lineno" valign="top"></td></tr>
224      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
225      <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>
226      <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>
227      <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>
228      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
229      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 15, line 16</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 15, line 11</em></th><td></td></tr>
230      <tr><td class="lineno" valign="top"></td><td class="left">   given and any current entity exists for that resource, then the</td><td> </td><td class="right">   given and any current entity exists for that resource, then the</td><td class="lineno" valign="top"></td></tr>
231      <tr><td class="lineno" valign="top"></td><td class="left">   server MUST NOT perform the requested method, unless required to do</td><td> </td><td class="right">   server MUST NOT perform the requested method, unless required to do</td><td class="lineno" valign="top"></td></tr>
232      <tr><td class="lineno" valign="top"></td><td class="left">   so because the resource's modification date fails to match that</td><td> </td><td class="right">   so because the resource's modification date fails to match that</td><td class="lineno" valign="top"></td></tr>
233      <tr><td class="lineno" valign="top"></td><td class="left">   supplied in an If-Modified-Since header field in the request.</td><td> </td><td class="right">   supplied in an If-Modified-Since header field in the request.</td><td class="lineno" valign="top"></td></tr>
234      <tr><td class="lineno" valign="top"></td><td class="left">   Instead, if the request method was GET or HEAD, the server SHOULD</td><td> </td><td class="right">   Instead, if the request method was GET or HEAD, the server SHOULD</td><td class="lineno" valign="top"></td></tr>
235      <tr><td class="lineno" valign="top"></td><td class="left">   respond with a 304 (Not Modified) response, including the cache-</td><td> </td><td class="right">   respond with a 304 (Not Modified) response, including the cache-</td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="left">   related header fields (particularly ETag) of one of the entities that</td><td> </td><td class="right">   related header fields (particularly ETag) of one of the entities that</td><td class="lineno" valign="top"></td></tr>
237      <tr><td class="lineno" valign="top"></td><td class="left">   matched.  For all other request methods, the server MUST respond with</td><td> </td><td class="right">   matched.  For all other request methods, the server MUST respond with</td><td class="lineno" valign="top"></td></tr>
238      <tr><td class="lineno" valign="top"></td><td class="left">   a status of 412 (Precondition Failed).</td><td> </td><td class="right">   a status of 412 (Precondition Failed).</td><td class="lineno" valign="top"></td></tr>
239      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
240      <tr><td><a name="diff0014" /></td></tr>
241      <tr><td class="lineno" valign="top"></td><td class="lblock">   See Section 5 for rules on how to determine if two entit<span class="delete">ies tags</span></td><td> </td><td class="rblock">   See Section 5 for rules on how to determine if two entit<span class="insert">y tags match.</span></td><td class="lineno" valign="top"></td></tr>
242      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   match.  The weak comparison function can only be used with GET or</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
243      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   HEAD requests.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
244      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
245      <tr><td class="lineno" valign="top"></td><td class="left">   If none of the entity tags match, then the server MAY perform the</td><td> </td><td class="right">   If none of the entity tags match, then the server MAY perform the</td><td class="lineno" valign="top"></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="left">   requested method as if the If-None-Match header field did not exist,</td><td> </td><td class="right">   requested method as if the If-None-Match header field did not exist,</td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left">   but MUST also ignore any If-Modified-Since header field(s) in the</td><td> </td><td class="right">   but MUST also ignore any If-Modified-Since header field(s) in the</td><td class="lineno" valign="top"></td></tr>
248      <tr><td class="lineno" valign="top"></td><td class="left">   request.  That is, if no entity tags match, then the server MUST NOT</td><td> </td><td class="right">   request.  That is, if no entity tags match, then the server MUST NOT</td><td class="lineno" valign="top"></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="left">   return a 304 (Not Modified) response.</td><td> </td><td class="right">   return a 304 (Not Modified) response.</td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
251      <tr><td class="lineno" valign="top"></td><td class="left">   If the request would, without the If-None-Match header field, result</td><td> </td><td class="right">   If the request would, without the If-None-Match header field, result</td><td class="lineno" valign="top"></td></tr>
252      <tr><td class="lineno" valign="top"></td><td class="left">   in anything other than a 2xx or 304 status, then the If-None-Match</td><td> </td><td class="right">   in anything other than a 2xx or 304 status, then the If-None-Match</td><td class="lineno" valign="top"></td></tr>
253      <tr><td class="lineno" valign="top"></td><td class="left">   header MUST be ignored.  (See Section 6 for a discussion of server</td><td> </td><td class="right">   header MUST be ignored.  (See Section 6 for a discussion of server</td><td class="lineno" valign="top"></td></tr>
254      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
255      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 17, line 25</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 17, line 16</em></th><td></td></tr>
256      <tr><td class="lineno" valign="top"></td><td class="left">   near the time that the response is generated.</td><td> </td><td class="right">   near the time that the response is generated.</td><td class="lineno" valign="top"></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">   HTTP/1.1 servers SHOULD send Last-Modified whenever feasible.</td><td> </td><td class="right">   HTTP/1.1 servers SHOULD send Last-Modified whenever feasible.</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">   The Last-Modified entity-header field value is often used as a cache</td><td> </td><td class="right">   The Last-Modified entity-header field value is often used as a cache</td><td class="lineno" valign="top"></td></tr>
261      <tr><td class="lineno" valign="top"></td><td class="left">   validator.  In simple terms, a cache entry is considered to be valid</td><td> </td><td class="right">   validator.  In simple terms, a cache entry is considered to be valid</td><td class="lineno" valign="top"></td></tr>
262      <tr><td class="lineno" valign="top"></td><td class="left">   if the entity has not been modified since the Last-Modified value.</td><td> </td><td class="right">   if the entity has not been modified since the Last-Modified value.</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">8.  IANA Considerations</td><td> </td><td class="right">8.  IANA Considerations</td><td class="lineno" valign="top"></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
266      <tr><td><a name="diff0015" /></td></tr>
267      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   [[anchor2: TBD.]]</span></td><td> </td><td class="rblock"><span class="insert">8.1.  Message Header Registration</span></td><td class="lineno" valign="top"></td></tr>
268      <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>
269      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   The Message Header Registry located at &lt;http://www.iana.org/</span></td><td class="lineno" valign="top"></td></tr>
270      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   assignments/message-headers/message-header-index.html&gt; should be</span></td><td class="lineno" valign="top"></td></tr>
271      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   updated with the permanent registrations below (see [RFC3864]):</span></td><td class="lineno" valign="top"></td></tr>
272      <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>
273      <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>
274      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">        | Header Field Name   | Protocol | Status   | Reference   |</span></td><td class="lineno" valign="top"></td></tr>
275      <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>
276      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">        | ETag                | http     | standard | Section 7.1 |</span></td><td class="lineno" valign="top"></td></tr>
277      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">        | If-Match            | http     | standard | Section 7.2 |</span></td><td class="lineno" valign="top"></td></tr>
278      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">        | If-Modified-Since   | http     | standard | Section 7.3 |</span></td><td class="lineno" valign="top"></td></tr>
279      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">        | If-None-Match       | http     | standard | Section 7.4 |</span></td><td class="lineno" valign="top"></td></tr>
280      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">        | If-Unmodified-Since | http     | standard | Section 7.5 |</span></td><td class="lineno" valign="top"></td></tr>
281      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">        | Last-Modified       | http     | standard | Section 7.6 |</span></td><td class="lineno" valign="top"></td></tr>
282      <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>
283      <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>
284      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   The change controller is: "IETF (iesg@ietf.org) - Internet</span></td><td class="lineno" valign="top"></td></tr>
285      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Engineering Task Force".</span></td><td class="lineno" valign="top"></td></tr>
286      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="left">9.  Security Considerations</td><td> </td><td class="right">9.  Security Considerations</td><td class="lineno" valign="top"></td></tr>
288      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="left">   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>
290      <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>
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">10.  Acknowledgments</td><td> </td><td class="right">10.  Acknowledgments</td><td class="lineno" valign="top"></td></tr>
293      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
294      <tr><td class="lineno" valign="top"></td><td class="left">11.  References</td><td> </td><td class="right">11.  References</td><td class="lineno" valign="top"></td></tr>
295      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
296      <tr><td class="lineno" valign="top"></td><td class="left">11.1.  Normative References</td><td> </td><td class="right">11.1.  Normative References</td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
298      <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>
299      <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>
300      <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>
301      <tr><td><a name="diff0016" /></td></tr>
302      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Message Parsing", draft-ietf-httpbis-p1-messaging-0<span class="delete">2</span></td><td> </td><td class="rblock">              and Message Parsing", draft-ietf-httpbis-p1-messaging-0<span class="insert">3</span></td><td class="lineno" valign="top"></td></tr>
303      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">February</span> 2008.</td><td> </td><td class="rblock">              (work in progress), <span class="insert">June</span> 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">   [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>
306      <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>
307      <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>
308      <tr><td><a name="diff0017" /></td></tr>
309      <tr><td class="lineno" valign="top"></td><td class="lblock">              Partial Responses", draft-ietf-httpbis-p5-range-0<span class="delete">2</span> (work</td><td> </td><td class="rblock">              Partial Responses", draft-ietf-httpbis-p5-range-0<span class="insert">3</span> (work</td><td class="lineno" valign="top"></td></tr>
310      <tr><td class="lineno" valign="top"></td><td class="lblock">              in progress), <span class="delete">February</span> 2008.</td><td> </td><td class="rblock">              in progress), <span class="insert">June</span> 2008.</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">   [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>
313      <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>
314      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",</td><td class="lineno" valign="top"></td></tr>
315      <tr><td><a name="diff0018" /></td></tr>
316      <tr><td class="lineno" valign="top"></td><td class="lblock">              draft-ietf-httpbis-p6-cache-0<span class="delete">2</span> (work in progress),</td><td> </td><td class="rblock">              draft-ietf-httpbis-p6-cache-0<span class="insert">3</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">February</span> 2008.</td><td> </td><td class="rblock">              <span class="insert">June</span> 2008.</td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
319      <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>
320      <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>
321      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
322      <tr><td class="lineno" valign="top"></td><td class="left">11.2.  Informative References</td><td> </td><td class="right">11.2.  Informative References</td><td class="lineno" valign="top"></td></tr>
323      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
324      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC2068]  Fielding, R., Gettys, J., Mogul, J., Nielsen, H., and T.</td><td> </td><td class="right">   [RFC2068]  Fielding, R., Gettys, J., Mogul, J., Nielsen, H., and T.</td><td class="lineno" valign="top"></td></tr>
325      <tr><td class="lineno" valign="top"></td><td class="left">              Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1",</td><td> </td><td class="right">              Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1",</td><td class="lineno" valign="top"></td></tr>
326      <tr><td class="lineno" valign="top"></td><td class="left">              RFC 2068, January 1997.</td><td> </td><td class="right">              RFC 2068, January 1997.</td><td class="lineno" valign="top"></td></tr>
327      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
328      <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>
329      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext</td><td> </td><td class="right">              Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext</td><td class="lineno" valign="top"></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="left">              Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.</td><td> </td><td class="right">              Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.</td><td class="lineno" valign="top"></td></tr>
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><a name="diff0019" /></td></tr>
333      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   [RFC3864]  Klyne, G., Nottingham, M., and J. Mogul, "Registration</span></td><td class="lineno" valign="top"></td></tr>
334      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">              Procedures for Message Header Fields", BCP 90, RFC 3864,</span></td><td class="lineno" valign="top"></td></tr>
335      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">              September 2004.</span></td><td class="lineno" valign="top"></td></tr>
336      <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>
337      <tr><td class="lineno" valign="top"></td><td class="left">Appendix A.  Compatibility with Previous Versions</td><td> </td><td class="right">Appendix A.  Compatibility with Previous Versions</td><td class="lineno" valign="top"></td></tr>
338      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
339      <tr><td class="lineno" valign="top"></td><td class="left">A.1.  Changes from RFC 2616</td><td> </td><td class="right">A.1.  Changes from RFC 2616</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><a name="diff0020" /></td></tr>
342      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Allow weak entity tags in all requests except range requests</span></td><td class="lineno" valign="top"></td></tr>
343      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   (Sections 5 and 7.4).</span></td><td class="lineno" valign="top"></td></tr>
344      <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>
345      <tr><td class="lineno" valign="top"></td><td class="left">Appendix B.  Change Log (to be removed by RFC Editor before publication)</td><td> </td><td class="right">Appendix B.  Change Log (to be removed by RFC Editor before publication)</td><td class="lineno" valign="top"></td></tr>
346      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
347      <tr><td class="lineno" valign="top"></td><td class="left">B.1.  Since RFC2616</td><td> </td><td class="right">B.1.  Since RFC2616</td><td class="lineno" valign="top"></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left">   Extracted relevant partitions from [RFC2616].</td><td> </td><td class="right">   Extracted relevant partitions from [RFC2616].</td><td class="lineno" valign="top"></td></tr>
350      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
351      <tr><td class="lineno" valign="top"></td><td class="left">B.2.  Since draft-ietf-httpbis-p4-conditional-00</td><td> </td><td class="right">B.2.  Since draft-ietf-httpbis-p4-conditional-00</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">   Closed issues:</td><td> </td><td class="right">   Closed issues:</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"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
356      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 19, line 8</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 19, line 30</em></th><td></td></tr>
357      <tr><td class="lineno" valign="top"></td><td class="left">   o  Move definitions of 304 and 412 condition codes from Part2.</td><td> </td><td class="right">   o  Move definitions of 304 and 412 condition codes from Part2.</td><td class="lineno" valign="top"></td></tr>
358      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
359      <tr><td class="lineno" valign="top"></td><td class="left">B.3.  Since draft-ietf-httpbis-p4-conditional-01</td><td> </td><td class="right">B.3.  Since draft-ietf-httpbis-p4-conditional-01</td><td class="lineno" valign="top"></td></tr>
360      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
361      <tr><td class="lineno" valign="top"></td><td class="left">   Ongoing work on ABNF conversion</td><td> </td><td class="right">   Ongoing work on ABNF conversion</td><td class="lineno" valign="top"></td></tr>
362      <tr><td class="lineno" valign="top"></td><td class="left">   (&lt;http://www3.tools.ietf.org/wg/httpbis/trac/ticket/36&gt;):</td><td> </td><td class="right">   (&lt;http://www3.tools.ietf.org/wg/httpbis/trac/ticket/36&gt;):</td><td class="lineno" valign="top"></td></tr>
363      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
364      <tr><td class="lineno" valign="top"></td><td class="left">   o  Add explicit references to BNF syntax and rules imported from</td><td> </td><td class="right">   o  Add explicit references to BNF syntax and rules imported from</td><td class="lineno" valign="top"></td></tr>
365      <tr><td class="lineno" valign="top"></td><td class="left">      other parts of the specification.</td><td> </td><td class="right">      other parts of the specification.</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><a name="diff0021" /></td></tr>
368      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">B.4.  Since draft-ietf-httpbis-p4-conditional-02</span></td><td class="lineno" valign="top"></td></tr>
369      <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>
370      <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>
371      <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>
372      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  &lt;http://www3.tools.ietf.org/wg/httpbis/trac/ticket/116&gt;: "Weak</span></td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      ETags on non-GET requests"</span></td><td class="lineno" valign="top"></td></tr>
374      <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>
375      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Ongoing work on IANA Message Header Registration</span></td><td class="lineno" valign="top"></td></tr>
376      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   (&lt;http://www3.tools.ietf.org/wg/httpbis/trac/ticket/40&gt;):</span></td><td class="lineno" valign="top"></td></tr>
377      <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>
378      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  Reference RFC 3984, and update header registrations for headers</span></td><td class="lineno" valign="top"></td></tr>
379      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      defined in this document.</span></td><td class="lineno" valign="top"></td></tr>
380      <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>
381      <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>
382      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
383      <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>
384      <tr><td class="lineno" valign="top"></td><td class="left">      304 Not Modified (status code)  5</td><td> </td><td class="right">      304 Not Modified (status code)  5</td><td class="lineno" valign="top"></td></tr>
385      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
386      <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>
387      <tr><td class="lineno" valign="top"></td><td class="left">      412 Precondition Failed (status code)  6</td><td> </td><td class="right">      412 Precondition Failed (status code)  6</td><td class="lineno" valign="top"></td></tr>
388      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
389      <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>
390      <tr><td class="lineno" valign="top"></td><td class="left">      ETag header  11</td><td> </td><td class="right">      ETag header  11</td><td class="lineno" valign="top"></td></tr>
391      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
392      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 19, line 34</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 20, line 21</em></th><td></td></tr>
393      <tr><td class="lineno" valign="top"></td><td class="left">         If-Modified-Since  13</td><td> </td><td class="right">         If-Modified-Since  13</td><td class="lineno" valign="top"></td></tr>
394      <tr><td class="lineno" valign="top"></td><td class="left">         If-None-Match  14</td><td> </td><td class="right">         If-None-Match  14</td><td class="lineno" valign="top"></td></tr>
395      <tr><td class="lineno" valign="top"></td><td class="left">         If-Unmodified-Since  16</td><td> </td><td class="right">         If-Unmodified-Since  16</td><td class="lineno" valign="top"></td></tr>
396      <tr><td class="lineno" valign="top"></td><td class="left">         Last-Modified  16</td><td> </td><td class="right">         Last-Modified  16</td><td class="lineno" valign="top"></td></tr>
397      <tr><td class="lineno" valign="top"></td><td class="left">         opaque-tag  5</td><td> </td><td class="right">         opaque-tag  5</td><td class="lineno" valign="top"></td></tr>
398      <tr><td class="lineno" valign="top"></td><td class="left">         weak  5</td><td> </td><td class="right">         weak  5</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">   H</td><td> </td><td class="right">   H</td><td class="lineno" valign="top"></td></tr>
401      <tr><td class="lineno" valign="top"></td><td class="left">      Headers</td><td> </td><td class="right">      Headers</td><td class="lineno" valign="top"></td></tr>
402      <tr><td class="lineno" valign="top"></td><td class="left">         ETag  11</td><td> </td><td class="right">         ETag  11</td><td class="lineno" valign="top"></td></tr>
403      <tr><td><a name="diff0022" /></td></tr>
404      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Match  1<span class="delete">2</span></td><td> </td><td class="rblock">         If-Match  1<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
405      <tr><td class="lineno" valign="top"></td><td class="left">         If-Modified-Since  13</td><td> </td><td class="right">         If-Modified-Since  13</td><td class="lineno" valign="top"></td></tr>
406      <tr><td class="lineno" valign="top"></td><td class="left">         If-None-Match  14</td><td> </td><td class="right">         If-None-Match  14</td><td class="lineno" valign="top"></td></tr>
407      <tr><td><a name="diff0023" /></td></tr>
408      <tr><td class="lineno" valign="top"></td><td class="lblock">         If-Unmodified-Since  1<span class="delete">6</span></td><td> </td><td class="rblock">         If-Unmodified-Since  1<span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
409      <tr><td class="lineno" valign="top"></td><td class="left">         Last-Modified  16</td><td> </td><td class="right">         Last-Modified  16</td><td class="lineno" valign="top"></td></tr>
410      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
411      <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>
412      <tr><td><a name="diff0024" /></td></tr>
413      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-Match header  1<span class="delete">2</span></td><td> </td><td class="rblock">      If-Match header  1<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
414      <tr><td class="lineno" valign="top"></td><td class="left">      If-Modified-Since header  13</td><td> </td><td class="right">      If-Modified-Since header  13</td><td class="lineno" valign="top"></td></tr>
415      <tr><td class="lineno" valign="top"></td><td class="left">      If-None-Match header  14</td><td> </td><td class="right">      If-None-Match header  14</td><td class="lineno" valign="top"></td></tr>
416      <tr><td><a name="diff0025" /></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="lblock">      If-Unmodified-Since header  1<span class="delete">6</span></td><td> </td><td class="rblock">      If-Unmodified-Since header  1<span class="insert">5</span></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 class="lineno" valign="top"></td><td class="left">   L</td><td> </td><td class="right">   L</td><td class="lineno" valign="top"></td></tr>
420      <tr><td class="lineno" valign="top"></td><td class="left">      Last-Modified header  16</td><td> </td><td class="right">      Last-Modified header  16</td><td class="lineno" valign="top"></td></tr>
421      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
422      <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>
423      <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>
424      <tr><td class="lineno" valign="top"></td><td class="left">         304 Not Modified  5</td><td> </td><td class="right">         304 Not Modified  5</td><td class="lineno" valign="top"></td></tr>
425      <tr><td class="lineno" valign="top"></td><td class="left">         412 Precondition Failed  6</td><td> </td><td class="right">         412 Precondition Failed  6</td><td class="lineno" valign="top"></td></tr>
426      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
427      <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>
428      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
429      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 23, line 44</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> line 1018</em></th><td></td></tr>
430      <tr><td class="lineno" valign="top"></td><td class="left">   attempt made to obtain a general license or permission for the use of</td><td> </td><td class="right">   attempt made to obtain a general license or permission for the use of</td><td class="lineno" valign="top"></td></tr>
431      <tr><td class="lineno" valign="top"></td><td class="left">   such proprietary rights by implementers or users of this</td><td> </td><td class="right">   such proprietary rights by implementers or users of this</td><td class="lineno" valign="top"></td></tr>
432      <tr><td class="lineno" valign="top"></td><td class="left">   specification can be obtained from the IETF on-line IPR repository at</td><td> </td><td class="right">   specification can be obtained from the IETF on-line IPR repository at</td><td class="lineno" valign="top"></td></tr>
433      <tr><td class="lineno" valign="top"></td><td class="left">   http://www.ietf.org/ipr.</td><td> </td><td class="right">   http://www.ietf.org/ipr.</td><td class="lineno" valign="top"></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="left">   The IETF invites any interested party to bring to its attention any</td><td> </td><td class="right">   The IETF invites any interested party to bring to its attention any</td><td class="lineno" valign="top"></td></tr>
436      <tr><td class="lineno" valign="top"></td><td class="left">   copyrights, patents or patent applications, or other proprietary</td><td> </td><td class="right">   copyrights, patents or patent applications, or other proprietary</td><td class="lineno" valign="top"></td></tr>
437      <tr><td class="lineno" valign="top"></td><td class="left">   rights that may cover technology that may be required to implement</td><td> </td><td class="right">   rights that may cover technology that may be required to implement</td><td class="lineno" valign="top"></td></tr>
438      <tr><td class="lineno" valign="top"></td><td class="left">   this standard.  Please address the information to the IETF at</td><td> </td><td class="right">   this standard.  Please address the information to the IETF at</td><td class="lineno" valign="top"></td></tr>
439      <tr><td class="lineno" valign="top"></td><td class="left">   ietf-ipr@ietf.org.</td><td> </td><td class="right">   ietf-ipr@ietf.org.</td><td class="lineno" valign="top"></td></tr>
440      <tr><td><a name="diff0026" /></td></tr>
441      <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>
442      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">Acknowledgment</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
443      <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>
444      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Funding for the RFC Editor function is provided by the IETF</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
445      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Administrative Support Activity (IASA).</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
446
447     <tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
448     <tr bgcolor="gray"><th colspan="5" align="center"><a name="end">&nbsp;End of changes. 26 change blocks.&nbsp;</a></th></tr>
449     <tr class="stats"><td></td><th><i>42 lines changed or deleted</i></th><th><i> </i></th><th><i>70 lines changed or added</i></th><td></td></tr>
450     <tr><td colspan="5" align="center" class="small"><br/>This html diff was produced by rfcdiff 1.34. The latest version is available from <a href="http://www.tools.ietf.org/tools/rfcdiff/" >http://tools.ietf.org/tools/rfcdiff/</a> </td></tr>
451   </table>
452   </body>
453   </html>
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