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36<body > 
37  <table border="0" cellpadding="0" cellspacing="0"> 
38  <tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p6-cache-06.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p6-cache-07.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                                              Day Software</td><td> </td><td class="right">Internet-Draft                                              Day Software</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                    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>
44      <tr><td><a name="diff0001" /></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">September 10, 2009</span>                                     J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">January 14, 2010  </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 Systems</td><td> </td><td class="right">                                                           Adobe Systems</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><a name="diff0002" /></td></tr>
58      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                      <span class="insert">M. Nottingham, Ed.</span></td><td class="lineno" valign="top"></td></tr>
59      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
60      <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>
61      <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>
62      <tr><td><a name="diff0003" /></td></tr>
63      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                           <span class="delete">March 9</span>, 2009</td><td> </td><td class="rblock">                                                           <span class="insert">July 13</span>, 2009</td><td class="lineno" valign="top"></td></tr>
64      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
65      <tr><td class="lineno" valign="top"></td><td class="left">                       HTTP/1.1, part 6: Caching</td><td> </td><td class="right">                       HTTP/1.1, part 6: Caching</td><td class="lineno" valign="top"></td></tr>
66      <tr><td><a name="diff0004" /></td></tr>
67      <tr><td class="lineno" valign="top"></td><td class="lblock">                     draft-ietf-httpbis-p6-cache-0<span class="delete">6</span></td><td> </td><td class="rblock">                     draft-ietf-httpbis-p6-cache-0<span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
68      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
69      <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>
70      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
71      <tr><td class="lineno" valign="top"></td><td class="left">   This Internet-Draft is submitted to IETF in full conformance with the</td><td> </td><td class="right">   This Internet-Draft is submitted to IETF in full conformance with the</td><td class="lineno" valign="top"></td></tr>
72      <tr><td class="lineno" valign="top"></td><td class="left">   provisions of BCP 78 and BCP 79.  This document may contain material</td><td> </td><td class="right">   provisions of BCP 78 and BCP 79.  This document may contain material</td><td class="lineno" valign="top"></td></tr>
73      <tr><td class="lineno" valign="top"></td><td class="left">   from IETF Documents or IETF Contributions published or made publicly</td><td> </td><td class="right">   from IETF Documents or IETF Contributions published or made publicly</td><td class="lineno" valign="top"></td></tr>
74      <tr><td class="lineno" valign="top"></td><td class="left">   available before November 10, 2008.  The person(s) controlling the</td><td> </td><td class="right">   available before November 10, 2008.  The person(s) controlling the</td><td class="lineno" valign="top"></td></tr>
75      <tr><td class="lineno" valign="top"></td><td class="left">   copyright in some of this material may not have granted the IETF</td><td> </td><td class="right">   copyright in some of this material may not have granted the IETF</td><td class="lineno" valign="top"></td></tr>
76      <tr><td class="lineno" valign="top"></td><td class="left">   Trust the right to allow modifications of such material outside the</td><td> </td><td class="right">   Trust the right to allow modifications of such material outside the</td><td class="lineno" valign="top"></td></tr>
77      <tr><td class="lineno" valign="top"></td><td class="left">   IETF Standards Process.  Without obtaining an adequate license from</td><td> </td><td class="right">   IETF Standards Process.  Without obtaining an adequate license from</td><td class="lineno" valign="top"></td></tr>
78      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
79      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 2, line 4</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 2, line 6</em></th><td></td></tr>
80      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
81      <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>
82      <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>
83      <tr><td class="lineno" valign="top"></td><td class="left">   other groups may also distribute working documents as Internet-</td><td> </td><td class="right">   other groups may also distribute working documents as Internet-</td><td class="lineno" valign="top"></td></tr>
84      <tr><td class="lineno" valign="top"></td><td class="left">   Drafts.</td><td> </td><td class="right">   Drafts.</td><td class="lineno" valign="top"></td></tr>
85      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
86      <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>
87      <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>
88      <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>
89      <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>
90      <tr><td><a name="diff0005" /></td></tr>
91      <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>
92      <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>
93      <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>
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">   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>
96      <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>
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><a name="diff0006" /></td></tr>
99      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on <span class="delete">September 10, 2009</span>.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">January 14, 2010</span>.</td><td class="lineno" valign="top"></td></tr>
100      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
101      <tr><td class="lineno" valign="top"></td><td class="left">Copyright Notice</td><td> </td><td class="right">Copyright Notice</td><td class="lineno" valign="top"></td></tr>
102      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
103      <tr><td class="lineno" valign="top"></td><td class="left">   Copyright (c) 2009 IETF Trust and the persons identified as the</td><td> </td><td class="right">   Copyright (c) 2009 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
104      <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>
105      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
106      <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>
107      <tr><td class="lineno" valign="top"></td><td class="left">   Provisions Relating to IETF Documents in effect on the date of</td><td> </td><td class="right">   Provisions Relating to IETF Documents in effect on the date of</td><td class="lineno" valign="top"></td></tr>
108      <tr><td class="lineno" valign="top"></td><td class="left">   publication of this document (http://trustee.ietf.org/license-info).</td><td> </td><td class="right">   publication of this document (http://trustee.ietf.org/license-info).</td><td class="lineno" valign="top"></td></tr>
109      <tr><td class="lineno" valign="top"></td><td class="left">   Please review these documents carefully, as they describe your rights</td><td> </td><td class="right">   Please review these documents carefully, as they describe your rights</td><td class="lineno" valign="top"></td></tr>
110      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
111      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 2, line 41</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 2, line 44</em></th><td></td></tr>
112      <tr><td class="lineno" valign="top"></td><td class="left">   or indicate cacheable response messages.</td><td> </td><td class="right">   or indicate cacheable response messages.</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">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>
115      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
116      <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>
117      <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>
118      <tr><td class="lineno" valign="top"></td><td class="left">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td> </td><td class="right">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td class="lineno" valign="top"></td></tr>
119      <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>
120      <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>
121      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
122      <tr><td><a name="diff0007" /></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="lblock">   The changes in this draft are summarized in Appendix C.<span class="delete">7</span>.</td><td> </td><td class="rblock">   The changes in this draft are summarized in Appendix C.<span class="insert">8</span>.</td><td class="lineno" valign="top"></td></tr>
124      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
125      <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>
126      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
127      <tr><td class="lineno" valign="top"></td><td class="left">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td> </td><td class="right">   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
128      <tr><td class="lineno" valign="top"></td><td class="left">     1.1.  Purpose  . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td> </td><td class="right">     1.1.  Purpose  . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
129      <tr><td class="lineno" valign="top"></td><td class="left">     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  5</td><td> </td><td class="right">     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
130      <tr><td class="lineno" valign="top"></td><td class="left">     1.3.  Requirements . . . . . . . . . . . . . . . . . . . . . . .  6</td><td> </td><td class="right">     1.3.  Requirements . . . . . . . . . . . . . . . . . . . . . . .  6</td><td class="lineno" valign="top"></td></tr>
131      <tr><td class="lineno" valign="top"></td><td class="left">     1.4.  Syntax Notation  . . . . . . . . . . . . . . . . . . . . .  7</td><td> </td><td class="right">     1.4.  Syntax Notation  . . . . . . . . . . . . . . . . . . . . .  7</td><td class="lineno" valign="top"></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="left">       1.4.1.  Core Rules . . . . . . . . . . . . . . . . . . . . . .  7</td><td> </td><td class="right">       1.4.1.  Core Rules . . . . . . . . . . . . . . . . . . . . . .  7</td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="left">       1.4.2.  ABNF Rules defined in other Parts of the</td><td> </td><td class="right">       1.4.2.  ABNF Rules defined in other Parts of the</td><td class="lineno" valign="top"></td></tr>
134      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
135      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 3, line 27</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 3, line 27</em></th><td></td></tr>
136      <tr><td class="lineno" valign="top"></td><td class="left">       2.1.1.  Storing Partial and Incomplete Responses . . . . . . .  8</td><td> </td><td class="right">       2.1.1.  Storing Partial and Incomplete Responses . . . . . . .  8</td><td class="lineno" valign="top"></td></tr>
137      <tr><td class="lineno" valign="top"></td><td class="left">     2.2.  Constructing Responses from Caches . . . . . . . . . . . .  8</td><td> </td><td class="right">     2.2.  Constructing Responses from Caches . . . . . . . . . . . .  8</td><td class="lineno" valign="top"></td></tr>
138      <tr><td class="lineno" valign="top"></td><td class="left">     2.3.  Freshness Model  . . . . . . . . . . . . . . . . . . . . .  9</td><td> </td><td class="right">     2.3.  Freshness Model  . . . . . . . . . . . . . . . . . . . . .  9</td><td class="lineno" valign="top"></td></tr>
139      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.1.  Calculating Freshness Lifetime . . . . . . . . . . . . 10</td><td> </td><td class="right">       2.3.1.  Calculating Freshness Lifetime . . . . . . . . . . . . 10</td><td class="lineno" valign="top"></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.2.  Calculating Age  . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="right">       2.3.2.  Calculating Age  . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.3.  Serving Stale Responses  . . . . . . . . . . . . . . . 13</td><td> </td><td class="right">       2.3.3.  Serving Stale Responses  . . . . . . . . . . . . . . . 13</td><td class="lineno" valign="top"></td></tr>
142      <tr><td class="lineno" valign="top"></td><td class="left">     2.4.  Validation Model . . . . . . . . . . . . . . . . . . . . . 13</td><td> </td><td class="right">     2.4.  Validation Model . . . . . . . . . . . . . . . . . . . . . 13</td><td class="lineno" valign="top"></td></tr>
143      <tr><td class="lineno" valign="top"></td><td class="left">     2.5.  Request Methods that Invalidate  . . . . . . . . . . . . . 14</td><td> </td><td class="right">     2.5.  Request Methods that Invalidate  . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="left">     2.6.  Caching Negotiated Responses . . . . . . . . . . . . . . . 15</td><td> </td><td class="right">     2.6.  Caching Negotiated Responses . . . . . . . . . . . . . . . 15</td><td class="lineno" valign="top"></td></tr>
145      <tr><td class="lineno" valign="top"></td><td class="left">     2.7.  Combining Responses  . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="right">     2.7.  Combining Responses  . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
146      <tr><td><a name="diff0008" /></td></tr>
147      <tr><td class="lineno" valign="top"></td><td class="lblock">   3.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 1<span class="delete">6</span></td><td> </td><td class="rblock">   3.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 1<span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="left">     3.1.  Age  . . . . . . . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">     3.1.  Age  . . . . . . . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
149      <tr><td class="lineno" valign="top"></td><td class="left">     3.2.  Cache-Control  . . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">     3.2.  Cache-Control  . . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
150      <tr><td class="lineno" valign="top"></td><td class="left">       3.2.1.  Request Cache-Control Directives . . . . . . . . . . . 18</td><td> </td><td class="right">       3.2.1.  Request Cache-Control Directives . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
151      <tr><td class="lineno" valign="top"></td><td class="left">       3.2.2.  Response Cache-Control Directives  . . . . . . . . . . 20</td><td> </td><td class="right">       3.2.2.  Response Cache-Control Directives  . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
152      <tr><td class="lineno" valign="top"></td><td class="left">       3.2.3.  Cache Control Extensions . . . . . . . . . . . . . . . 22</td><td> </td><td class="right">       3.2.3.  Cache Control Extensions . . . . . . . . . . . . . . . 22</td><td class="lineno" valign="top"></td></tr>
153      <tr><td class="lineno" valign="top"></td><td class="left">     3.3.  Expires  . . . . . . . . . . . . . . . . . . . . . . . . . 23</td><td> </td><td class="right">     3.3.  Expires  . . . . . . . . . . . . . . . . . . . . . . . . . 23</td><td class="lineno" valign="top"></td></tr>
154      <tr><td class="lineno" valign="top"></td><td class="left">     3.4.  Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 23</td><td> </td><td class="right">     3.4.  Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 23</td><td class="lineno" valign="top"></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="left">     3.5.  Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 24</td><td> </td><td class="right">     3.5.  Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
156      <tr><td class="lineno" valign="top"></td><td class="left">     3.6.  Warning  . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td> </td><td class="right">     3.6.  Warning  . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td class="lineno" valign="top"></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="left">   4.  History Lists  . . . . . . . . . . . . . . . . . . . . . . . . 28</td><td> </td><td class="right">   4.  History Lists  . . . . . . . . . . . . . . . . . . . . . . . . 28</td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
159      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 4, line 9</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 4, line 9</em></th><td></td></tr>
160      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . 31</td><td> </td><td class="right">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . 31</td><td class="lineno" valign="top"></td></tr>
161      <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>
162      <tr><td class="lineno" valign="top"></td><td class="left">                publication)  . . . . . . . . . . . . . . . . . . . . 33</td><td> </td><td class="right">                publication)  . . . . . . . . . . . . . . . . . . . . 33</td><td class="lineno" valign="top"></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="left">     C.1.  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . 33</td><td> </td><td class="right">     C.1.  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . 33</td><td class="lineno" valign="top"></td></tr>
164      <tr><td class="lineno" valign="top"></td><td class="left">     C.2.  Since draft-ietf-httpbis-p6-cache-00 . . . . . . . . . . . 33</td><td> </td><td class="right">     C.2.  Since draft-ietf-httpbis-p6-cache-00 . . . . . . . . . . . 33</td><td class="lineno" valign="top"></td></tr>
165      <tr><td class="lineno" valign="top"></td><td class="left">     C.3.  Since draft-ietf-httpbis-p6-cache-01 . . . . . . . . . . . 34</td><td> </td><td class="right">     C.3.  Since draft-ietf-httpbis-p6-cache-01 . . . . . . . . . . . 34</td><td class="lineno" valign="top"></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="left">     C.4.  Since draft-ietf-httpbis-p6-cache-02 . . . . . . . . . . . 34</td><td> </td><td class="right">     C.4.  Since draft-ietf-httpbis-p6-cache-02 . . . . . . . . . . . 34</td><td class="lineno" valign="top"></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="left">     C.5.  Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . 34</td><td> </td><td class="right">     C.5.  Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . 34</td><td class="lineno" valign="top"></td></tr>
168      <tr><td class="lineno" valign="top"></td><td class="left">     C.6.  Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . 35</td><td> </td><td class="right">     C.6.  Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . 35</td><td class="lineno" valign="top"></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="left">     C.7.  Since draft-ietf-httpbis-p6-cache-05 . . . . . . . . . . . 35</td><td> </td><td class="right">     C.7.  Since draft-ietf-httpbis-p6-cache-05 . . . . . . . . . . . 35</td><td class="lineno" valign="top"></td></tr>
170      <tr><td><a name="diff0009" /></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="lblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock">     <span class="insert">C.8.  Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . 35</span></td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">36</span></td><td class="lineno" valign="top"></td></tr>
173      <tr><td class="lineno" valign="top"></td><td class="left">   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 38</td><td> </td><td class="right">   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 38</td><td class="lineno" valign="top"></td></tr>
174      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
175      <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>
176      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
177      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP is typically used for distributed information systems, where</td><td> </td><td class="right">   HTTP is typically used for distributed information systems, where</td><td class="lineno" valign="top"></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="left">   performance can be improved by the use of response caches.  This</td><td> </td><td class="right">   performance can be improved by the use of response caches.  This</td><td class="lineno" valign="top"></td></tr>
179      <tr><td class="lineno" valign="top"></td><td class="left">   document defines aspects of HTTP/1.1 related to caching and reusing</td><td> </td><td class="right">   document defines aspects of HTTP/1.1 related to caching and reusing</td><td class="lineno" valign="top"></td></tr>
180      <tr><td class="lineno" valign="top"></td><td class="left">   response messages.</td><td> </td><td class="right">   response messages.</td><td class="lineno" valign="top"></td></tr>
181      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="left">1.1.  Purpose</td><td> </td><td class="right">1.1.  Purpose</td><td class="lineno" valign="top"></td></tr>
183      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
184      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 7, line 39</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 7, line 39</em></th><td></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="left">     quoted-string = &lt;quoted-string, defined in [Part1], Section 1.2.2&gt;</td><td> </td><td class="right">     quoted-string = &lt;quoted-string, defined in [Part1], Section 1.2.2&gt;</td><td class="lineno" valign="top"></td></tr>
187      <tr><td class="lineno" valign="top"></td><td class="left">     token         = &lt;token, defined in [Part1], Section 1.2.2&gt;</td><td> </td><td class="right">     token         = &lt;token, defined in [Part1], Section 1.2.2&gt;</td><td class="lineno" valign="top"></td></tr>
188      <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>
189      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
190      <tr><td class="lineno" valign="top"></td><td class="left">1.4.2.  ABNF Rules defined in other Parts of the Specification</td><td> </td><td class="right">1.4.2.  ABNF Rules defined in other Parts of the Specification</td><td class="lineno" valign="top"></td></tr>
191      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
192      <tr><td class="lineno" valign="top"></td><td class="left">   The ABNF rules below are defined in other parts:</td><td> </td><td class="right">   The ABNF rules below are defined in other parts:</td><td class="lineno" valign="top"></td></tr>
193      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
194      <tr><td class="lineno" valign="top"></td><td class="left">     field-name    = &lt;field-name, defined in [Part1], Section 4.2&gt;</td><td> </td><td class="right">     field-name    = &lt;field-name, defined in [Part1], Section 4.2&gt;</td><td class="lineno" valign="top"></td></tr>
195      <tr><td><a name="diff0010" /></td></tr>
196      <tr><td class="lineno" valign="top"></td><td class="lblock">     HTTP-date     = &lt;HTTP-date, defined in [Part1], Section 3.2<span class="delete">.1</span>&gt;</td><td> </td><td class="rblock">     HTTP-date     = &lt;HTTP-date, defined in [Part1], Section 3.2&gt;</td><td class="lineno" valign="top"></td></tr>
197      <tr><td class="lineno" valign="top"></td><td class="left">     port          = &lt;port, defined in [Part1], Section 2.1&gt;</td><td> </td><td class="right">     port          = &lt;port, defined in [Part1], Section 2.1&gt;</td><td class="lineno" valign="top"></td></tr>
198      <tr><td class="lineno" valign="top"></td><td class="left">     pseudonym     = &lt;pseudonym, defined in [Part1], Section 8.9&gt;</td><td> </td><td class="right">     pseudonym     = &lt;pseudonym, defined in [Part1], Section 8.9&gt;</td><td class="lineno" valign="top"></td></tr>
199      <tr><td class="lineno" valign="top"></td><td class="left">     uri-host      = &lt;uri-host, defined in [Part1], Section 2.1&gt;</td><td> </td><td class="right">     uri-host      = &lt;uri-host, defined in [Part1], Section 2.1&gt;</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">2.  Cache Operation</td><td> </td><td class="right">2.  Cache Operation</td><td class="lineno" valign="top"></td></tr>
202      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
203      <tr><td class="lineno" valign="top"></td><td class="left">2.1.  Response Cacheability</td><td> </td><td class="right">2.1.  Response Cacheability</td><td class="lineno" valign="top"></td></tr>
204      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
205      <tr><td class="lineno" valign="top"></td><td class="left">   A cache MUST NOT store a response to any request, unless:</td><td> </td><td class="right">   A cache MUST NOT store a response to any request, unless:</td><td class="lineno" valign="top"></td></tr>
206      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
207      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
208      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 8, line 45</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 8, line 45</em></th><td></td></tr>
209      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
210      <tr><td class="lineno" valign="top"></td><td class="left">   A cache that does not support the Range and Content-Range headers</td><td> </td><td class="right">   A cache that does not support the Range and Content-Range headers</td><td class="lineno" valign="top"></td></tr>
211      <tr><td class="lineno" valign="top"></td><td class="left">   MUST NOT store incomplete or partial responses.</td><td> </td><td class="right">   MUST NOT store incomplete or partial responses.</td><td class="lineno" valign="top"></td></tr>
212      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
213      <tr><td class="lineno" valign="top"></td><td class="left">2.2.  Constructing Responses from Caches</td><td> </td><td class="right">2.2.  Constructing Responses from Caches</td><td class="lineno" valign="top"></td></tr>
214      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
215      <tr><td class="lineno" valign="top"></td><td class="left">   For a presented request, a cache MUST NOT return a stored response,</td><td> </td><td class="right">   For a presented request, a cache MUST NOT return a stored response,</td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="left">   unless:</td><td> </td><td class="right">   unless:</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">   o  The presented Request-URI and that of the stored response match</td><td> </td><td class="right">   o  The presented Request-URI and that of the stored response match</td><td class="lineno" valign="top"></td></tr>
219      <tr><td><a name="diff0011" /></td></tr>
220      <tr><td class="lineno" valign="top"></td><td class="lblock">      <span class="delete">(see [[anchor1: TBD]]),</span> and</td><td> </td><td class="rblock">      <span class="insert">([[TODO-Request-URI: Need to find a new term for this, as Part 1</span></td><td class="lineno" valign="top"></td></tr>
221      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      doesn't define Request-URI anymore; the new term request-target</span></td><td class="lineno" valign="top"></td></tr>
222      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      does not work for this.]]),</span> and</td><td class="lineno" valign="top"></td></tr>
223      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
224      <tr><td class="lineno" valign="top"></td><td class="left">   o  the request method associated with the stored response allows it</td><td> </td><td class="right">   o  the request method associated with the stored response allows it</td><td class="lineno" valign="top"></td></tr>
225      <tr><td class="lineno" valign="top"></td><td class="left">      to be used for the presented request, and</td><td> </td><td class="right">      to be used for the presented request, and</td><td class="lineno" valign="top"></td></tr>
226      <tr><td><a name="diff0012" /></td></tr>
227      <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>
228      <tr><td class="lineno" valign="top"></td><td class="left">   o  selecting request-headers nominated by the stored response (if</td><td> </td><td class="right">   o  selecting request-headers nominated by the stored response (if</td><td class="lineno" valign="top"></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="left">      any) match those presented (see Section 2.6), and</td><td> </td><td class="right">      any) match those presented (see Section 2.6), and</td><td class="lineno" valign="top"></td></tr>
230      <tr><td><a name="diff0013" /></td></tr>
231      <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>
232      <tr><td class="lineno" valign="top"></td><td class="left">   o  the presented request and stored response are free from directives</td><td> </td><td class="right">   o  the presented request and stored response are free from directives</td><td class="lineno" valign="top"></td></tr>
233      <tr><td class="lineno" valign="top"></td><td class="left">      that would prevent its use (see Section 3.2 and Section 3.4), and</td><td> </td><td class="right">      that would prevent its use (see Section 3.2 and Section 3.4), and</td><td class="lineno" valign="top"></td></tr>
234      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
235      <tr><td class="lineno" valign="top"></td><td class="left">   o  the stored response is either:</td><td> </td><td class="right">   o  the stored response is either:</td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
237      <tr><td class="lineno" valign="top"></td><td class="left">      *  fresh (see Section 2.3), or</td><td> </td><td class="right">      *  fresh (see Section 2.3), or</td><td class="lineno" valign="top"></td></tr>
238      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
239      <tr><td class="lineno" valign="top"></td><td class="left">      *  allowed to be served stale (see Section 2.3.3), or</td><td> </td><td class="right">      *  allowed to be served stale (see Section 2.3.3), or</td><td class="lineno" valign="top"></td></tr>
240      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
241      <tr><td class="lineno" valign="top"></td><td class="left">      *  successfully validated (see Section 2.4).</td><td> </td><td class="right">      *  successfully validated (see Section 2.4).</td><td class="lineno" valign="top"></td></tr>
242      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
243      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 9, line 15</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 9, line 18</em></th><td></td></tr>
244      <tr><td class="lineno" valign="top"></td><td class="left">      that would prevent its use (see Section 3.2 and Section 3.4), and</td><td> </td><td class="right">      that would prevent its use (see Section 3.2 and Section 3.4), and</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">   o  the stored response is either:</td><td> </td><td class="right">   o  the stored response is either:</td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
248      <tr><td class="lineno" valign="top"></td><td class="left">      *  fresh (see Section 2.3), or</td><td> </td><td class="right">      *  fresh (see Section 2.3), or</td><td class="lineno" valign="top"></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="left">      *  allowed to be served stale (see Section 2.3.3), or</td><td> </td><td class="right">      *  allowed to be served stale (see Section 2.3.3), or</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">      *  successfully validated (see Section 2.4).</td><td> </td><td class="right">      *  successfully validated (see Section 2.4).</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><a name="diff0014" /></td></tr>
255      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[anchor2: TODO:</span> define method cacheability for GET, HEAD and POST in</td><td> </td><td class="rblock">   <span class="insert">[[TODO-method-cacheability:</span> define method cacheability for GET, HEAD</td><td class="lineno" valign="top"></td></tr>
256      <tr><td class="lineno" valign="top"></td><td class="lblock">   p2-semantics.]]</td><td> </td><td class="rblock">   and POST in p2-semantics.]]</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">   When a stored response is used to satisfy a request, caches MUST</td><td> </td><td class="right">   When a stored response is used to satisfy a request, caches MUST</td><td class="lineno" valign="top"></td></tr>
259      <tr><td><a name="diff0015" /></td></tr>
260      <tr><td class="lineno" valign="top"></td><td class="lblock">   include a single Age header field <span class="delete">Section 3.1</span> in the response with a</td><td> </td><td class="rblock">   include a single Age header field <span class="insert">(Section 3.1)</span> in the response with</td><td class="lineno" valign="top"></td></tr>
261      <tr><td class="lineno" valign="top"></td><td class="lblock">   value equal to the stored response's current_age; see Section 2.3.2.</td><td> </td><td class="rblock">   a value equal to the stored response's current_age; see</td><td class="lineno" valign="top"></td></tr>
262      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[anchor3:</span> DISCUSS: this currently includes successfully validated</td><td> </td><td class="rblock">   Section 2.3.2. <span class="insert">[[anchor1:</span> DISCUSS: this currently includes</td><td class="lineno" valign="top"></td></tr>
263      <tr><td class="lineno" valign="top"></td><td class="lblock">   responses.]]</td><td> </td><td class="rblock">   successfully validated responses.]]</td><td class="lineno" valign="top"></td></tr>
264      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="left">   Requests with methods that are unsafe (Section 7.1.1 of [Part2]) MUST</td><td> </td><td class="right">   Requests with methods that are unsafe (Section 7.1.1 of [Part2]) MUST</td><td class="lineno" valign="top"></td></tr>
266      <tr><td class="lineno" valign="top"></td><td class="left">   be written through the cache to the origin server; i.e., A cache must</td><td> </td><td class="right">   be written through the cache to the origin server; i.e., A cache must</td><td class="lineno" valign="top"></td></tr>
267      <tr><td class="lineno" valign="top"></td><td class="left">   not reply to such a request before having forwarded the request and</td><td> </td><td class="right">   not reply to such a request before having forwarded the request and</td><td class="lineno" valign="top"></td></tr>
268      <tr><td class="lineno" valign="top"></td><td class="left">   having received a corresponding response.</td><td> </td><td class="right">   having received a corresponding response.</td><td class="lineno" valign="top"></td></tr>
269      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
270      <tr><td class="lineno" valign="top"></td><td class="left">   Also, note that unsafe requests might invalidate already stored</td><td> </td><td class="right">   Also, note that unsafe requests might invalidate already stored</td><td class="lineno" valign="top"></td></tr>
271      <tr><td class="lineno" valign="top"></td><td class="left">   responses; see Section 2.5.</td><td> </td><td class="right">   responses; see Section 2.5.</td><td class="lineno" valign="top"></td></tr>
272      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
273      <tr><td class="lineno" valign="top"></td><td class="left">   Caches MUST use the most recent response (as determined by the Date</td><td> </td><td class="right">   Caches MUST use the most recent response (as determined by the Date</td><td class="lineno" valign="top"></td></tr>
274      <tr><td class="lineno" valign="top"></td><td class="left">   header) when more than one suitable response is stored.  They can</td><td> </td><td class="right">   header) when more than one suitable response is stored.  They can</td><td class="lineno" valign="top"></td></tr>
275      <tr><td class="lineno" valign="top"></td><td class="left">   also forward a request with "Cache-Control: max-age=0" or "Cache-</td><td> </td><td class="right">   also forward a request with "Cache-Control: max-age=0" or "Cache-</td><td class="lineno" valign="top"></td></tr>
276      <tr><td class="lineno" valign="top"></td><td class="left">   Control: no-cache" to disambiguate which response to use.</td><td> </td><td class="right">   Control: no-cache" to disambiguate which response to use.</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><a name="diff0016" /></td></tr>
279      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[anchor4: TODO:</span> end-to-end and hop-by-hop headers, <span class="delete">non-modifiable</span></td><td> </td><td class="rblock">   <span class="insert">[[TODO-header-properties:</span> end-to-end and hop-by-hop headers, <span class="insert">non-</span></td><td class="lineno" valign="top"></td></tr>
280      <tr><td class="lineno" valign="top"></td><td class="lblock">   headers removed; re-spec in p1]]</td><td> </td><td class="rblock"><span class="insert">   modifiable</span> headers removed; re-spec in p1]]</td><td class="lineno" valign="top"></td></tr>
281      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
282      <tr><td class="lineno" valign="top"></td><td class="left">2.3.  Freshness Model</td><td> </td><td class="right">2.3.  Freshness Model</td><td class="lineno" valign="top"></td></tr>
283      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
284      <tr><td class="lineno" valign="top"></td><td class="left">   When a response is "fresh" in the cache, it can be used to satisfy</td><td> </td><td class="right">   When a response is "fresh" in the cache, it can be used to satisfy</td><td class="lineno" valign="top"></td></tr>
285      <tr><td class="lineno" valign="top"></td><td class="left">   subsequent requests without contacting the origin server, thereby</td><td> </td><td class="right">   subsequent requests without contacting the origin server, thereby</td><td class="lineno" valign="top"></td></tr>
286      <tr><td class="lineno" valign="top"></td><td class="left">   improving efficiency.</td><td> </td><td class="right">   improving efficiency.</td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
288      <tr><td class="lineno" valign="top"></td><td class="left">   The primary mechanism for determining freshness is for an origin</td><td> </td><td class="right">   The primary mechanism for determining freshness is for an origin</td><td class="lineno" valign="top"></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="left">   server to provide an explicit expiration time in the future, using</td><td> </td><td class="right">   server to provide an explicit expiration time in the future, using</td><td class="lineno" valign="top"></td></tr>
290      <tr><td class="lineno" valign="top"></td><td class="left">   either the Expires header (Section 3.3) or the max-age response cache</td><td> </td><td class="right">   either the Expires header (Section 3.3) or the max-age response cache</td><td class="lineno" valign="top"></td></tr>
291      <tr><td class="lineno" valign="top"></td><td class="left">   directive (Section 3.2.2).  Generally, origin servers will assign</td><td> </td><td class="right">   directive (Section 3.2.2).  Generally, origin servers will assign</td><td class="lineno" valign="top"></td></tr>
292      <tr><td class="lineno" valign="top"></td><td class="left">   future explicit expiration times to responses in the belief that the</td><td> </td><td class="right">   future explicit expiration times to responses in the belief that the</td><td class="lineno" valign="top"></td></tr>
293      <tr><td class="lineno" valign="top"></td><td class="left">   entity is not likely to change in a semantically significant way</td><td> </td><td class="right">   entity is not likely to change in a semantically significant way</td><td class="lineno" valign="top"></td></tr>
294      <tr><td class="lineno" valign="top"></td><td class="left">   before the expiration time is reached.</td><td> </td><td class="right">   before the expiration time is reached.</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">   If an origin server wishes to force a cache to validate every</td><td> </td><td class="right">   If an origin server wishes to force a cache to validate every</td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="left">   request, it can assign an explicit expiration time in the past.  This</td><td> </td><td class="right">   request, it can assign an explicit expiration time in the past.  This</td><td class="lineno" valign="top"></td></tr>
298      <tr><td class="lineno" valign="top"></td><td class="left">   means that the response is always stale, so that caches should</td><td> </td><td class="right">   means that the response is always stale, so that caches should</td><td class="lineno" valign="top"></td></tr>
299      <tr><td><a name="diff0017" /></td></tr>
300      <tr><td class="lineno" valign="top"></td><td class="lblock">   validate it before using it for subsequent requests. [[anchor<span class="delete">5</span>: This</td><td> </td><td class="rblock">   validate it before using it for subsequent requests. [[anchor<span class="insert">2</span>: This</td><td class="lineno" valign="top"></td></tr>
301      <tr><td class="lineno" valign="top"></td><td class="left">   wording may cause confusion, because the response may still be served</td><td> </td><td class="right">   wording may cause confusion, because the response may still be served</td><td class="lineno" valign="top"></td></tr>
302      <tr><td class="lineno" valign="top"></td><td class="left">   stale.]]</td><td> </td><td class="right">   stale.]]</td><td class="lineno" valign="top"></td></tr>
303      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
304      <tr><td class="lineno" valign="top"></td><td class="left">   Since origin servers do not always provide explicit expiration times,</td><td> </td><td class="right">   Since origin servers do not always provide explicit expiration times,</td><td class="lineno" valign="top"></td></tr>
305      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP caches may also assign heuristic expiration times when they are</td><td> </td><td class="right">   HTTP caches may also assign heuristic expiration times when they are</td><td class="lineno" valign="top"></td></tr>
306      <tr><td class="lineno" valign="top"></td><td class="left">   not specified, employing algorithms that use other header values</td><td> </td><td class="right">   not specified, employing algorithms that use other header values</td><td class="lineno" valign="top"></td></tr>
307      <tr><td class="lineno" valign="top"></td><td class="left">   (such as the Last-Modified time) to estimate a plausible expiration</td><td> </td><td class="right">   (such as the Last-Modified time) to estimate a plausible expiration</td><td class="lineno" valign="top"></td></tr>
308      <tr><td class="lineno" valign="top"></td><td class="left">   time.  The HTTP/1.1 specification does not provide specific</td><td> </td><td class="right">   time.  The HTTP/1.1 specification does not provide specific</td><td class="lineno" valign="top"></td></tr>
309      <tr><td class="lineno" valign="top"></td><td class="left">   algorithms, but does impose worst-case constraints on their results.</td><td> </td><td class="right">   algorithms, but does impose worst-case constraints on their results.</td><td class="lineno" valign="top"></td></tr>
310      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
311      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
312      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 10, line 32</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 10, line 35</em></th><td></td></tr>
313      <tr><td class="lineno" valign="top"></td><td class="left">      response_is_fresh = (freshness_lifetime &gt; current_age)</td><td> </td><td class="right">      response_is_fresh = (freshness_lifetime &gt; current_age)</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">   The freshness_lifetime is defined in Section 2.3.1; the current_age</td><td> </td><td class="right">   The freshness_lifetime is defined in Section 2.3.1; the current_age</td><td class="lineno" valign="top"></td></tr>
316      <tr><td class="lineno" valign="top"></td><td class="left">   is defined in Section 2.3.2.</td><td> </td><td class="right">   is defined in Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="left">   Additionally, clients may need to influence freshness calculation.</td><td> </td><td class="right">   Additionally, clients may need to influence freshness calculation.</td><td class="lineno" valign="top"></td></tr>
319      <tr><td class="lineno" valign="top"></td><td class="left">   They can do this using several request cache directives, with the</td><td> </td><td class="right">   They can do this using several request cache directives, with the</td><td class="lineno" valign="top"></td></tr>
320      <tr><td class="lineno" valign="top"></td><td class="left">   effect of either increasing or loosening constraints on freshness.</td><td> </td><td class="right">   effect of either increasing or loosening constraints on freshness.</td><td class="lineno" valign="top"></td></tr>
321      <tr><td class="lineno" valign="top"></td><td class="left">   See Section 3.2.1.</td><td> </td><td class="right">   See Section 3.2.1.</td><td class="lineno" valign="top"></td></tr>
322      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
323      <tr><td><a name="diff0018" /></td></tr>
324      <tr><td class="lineno" valign="top"></td><td class="lblock">   [[anchor<span class="delete">6</span>: ISSUE: there are not requirements directly applying to</td><td> </td><td class="rblock">   [[anchor<span class="insert">3</span>: ISSUE: there are not requirements directly applying to</td><td class="lineno" valign="top"></td></tr>
325      <tr><td class="lineno" valign="top"></td><td class="left">   cache-request-directives and freshness.]]</td><td> </td><td class="right">   cache-request-directives and freshness.]]</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">   Note that freshness applies only to cache operation; it cannot be</td><td> </td><td class="right">   Note that freshness applies only to cache operation; it cannot be</td><td class="lineno" valign="top"></td></tr>
328      <tr><td class="lineno" valign="top"></td><td class="left">   used to force a user agent to refresh its display or reload a</td><td> </td><td class="right">   used to force a user agent to refresh its display or reload a</td><td class="lineno" valign="top"></td></tr>
329      <tr><td class="lineno" valign="top"></td><td class="left">   resource.  See Section 4 for an explanation of the difference between</td><td> </td><td class="right">   resource.  See Section 4 for an explanation of the difference between</td><td class="lineno" valign="top"></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="left">   caches and history mechanisms.</td><td> </td><td class="right">   caches and history mechanisms.</td><td class="lineno" valign="top"></td></tr>
331      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
332      <tr><td class="lineno" valign="top"></td><td class="left">2.3.1.  Calculating Freshness Lifetime</td><td> </td><td class="right">2.3.1.  Calculating Freshness Lifetime</td><td class="lineno" valign="top"></td></tr>
333      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
334      <tr><td class="lineno" valign="top"></td><td class="left">   A cache can calculate the freshness lifetime (denoted as</td><td> </td><td class="right">   A cache can calculate the freshness lifetime (denoted as</td><td class="lineno" valign="top"></td></tr>
335      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
336      <tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 11, line 30</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 11, line 33</em></th><td></td></tr>
337      <tr><td class="lineno" valign="top"></td><td class="left">   When a heuristic is used to calculate freshness lifetime, the cache</td><td> </td><td class="right">   When a heuristic is used to calculate freshness lifetime, the cache</td><td class="lineno" valign="top"></td></tr>
338      <tr><td class="lineno" valign="top"></td><td class="left">   SHOULD attach a Warning header with a 113 warn-code to the response</td><td> </td><td class="right">   SHOULD attach a Warning header with a 113 warn-code to the response</td><td class="lineno" valign="top"></td></tr>
339      <tr><td class="lineno" valign="top"></td><td class="left">   if its current_age is more than 24 hours and such a warning is not</td><td> </td><td class="right">   if its current_age is more than 24 hours and such a warning is not</td><td class="lineno" valign="top"></td></tr>
340      <tr><td class="lineno" valign="top"></td><td class="left">   already present.</td><td> </td><td class="right">   already present.</td><td class="lineno" valign="top"></td></tr>
341      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
342      <tr><td class="lineno" valign="top"></td><td class="left">   Also, if the response has a Last-Modified header (Section 6.6 of</td><td> </td><td class="right">   Also, if the response has a Last-Modified header (Section 6.6 of</td><td class="lineno" valign="top"></td></tr>
343      <tr><td class="lineno" valign="top"></td><td class="left">   [Part4]), the heuristic expiration value SHOULD be no more than some</td><td> </td><td class="right">   [Part4]), the heuristic expiration value SHOULD be no more than some</td><td class="lineno" valign="top"></td></tr>
344      <tr><td class="lineno" valign="top"></td><td class="left">   fraction of the interval since that time.  A typical setting of this</td><td> </td><td class="right">   fraction of the interval since that time.  A typical setting of this</td><td class="lineno" valign="top"></td></tr>
345      <tr><td class="lineno" valign="top"></td><td class="left">   fraction might be 10%.</td><td> </td><td class="right">   fraction might be 10%.</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><a name="diff0019" /></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="lblock">   [[anchor<span class="delete">7</span>: REVIEW: took away HTTP/1.0 query string heuristic</td><td> </td><td class="rblock">   [[anchor<span class="insert">4</span>: REVIEW: took away HTTP/1.0 query string heuristic</td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left">   uncacheability.]]</td><td> </td><td class="right">   uncacheability.]]</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">2.3.2.  Calculating Age</td><td> </td><td class="right">2.3.2.  Calculating Age</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">   HTTP/1.1 uses the Age response-header to convey the estimated age of</td><td> </td><td class="right">   HTTP/1.1 uses the Age response-header to convey the estimated age of</td><td class="lineno" valign="top"></td></tr>
354      <tr><td class="lineno" valign="top"></td><td class="left">   the response message when obtained from a cache.  The Age field value</td><td> </td><td class="right">   the response message when obtained from a cache.  The Age field value</td><td class="lineno" valign="top"></td></tr>
355      <tr><td class="lineno" valign="top"></td><td class="left">   is the cache's estimate of the amount of time since the response was</td><td> </td><td class="right">   is the cache's estimate of the amount of time since the response was</td><td class="lineno" valign="top"></td></tr>
356      <tr><td class="lineno" valign="top"></td><td class="left">   generated or validated by the origin server.  In essence, the Age</td><td> </td><td class="right">   generated or validated by the origin server.  In essence, the Age</td><td class="lineno" valign="top"></td></tr>
357      <tr><td class="lineno" valign="top"></td><td class="left">   value is the sum of the time that the response has been resident in</td><td> </td><td class="right">   value is the sum of the time that the response has been resident in</td><td class="lineno" valign="top"></td></tr>
358      <tr><td class="lineno" valign="top"></td><td class="left">   each of the caches along the path from the origin server, plus the</td><td> </td><td class="right">   each of the caches along the path from the origin server, plus the</td><td class="lineno" valign="top"></td></tr>
359      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
360      <tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 13, line 36</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 13, line 50</em></th><td></td></tr>
361      <tr><td class="lineno" valign="top"></td><td class="left">   If a cache receives a first-hand response (either an entire response,</td><td> </td><td class="right">   If a cache receives a first-hand response (either an entire response,</td><td class="lineno" valign="top"></td></tr>
362      <tr><td class="lineno" valign="top"></td><td class="left">   or a 304 (Not Modified) response) that it would normally forward to</td><td> </td><td class="right">   or a 304 (Not Modified) response) that it would normally forward to</td><td class="lineno" valign="top"></td></tr>
363      <tr><td class="lineno" valign="top"></td><td class="left">   the requesting client, and the received response is no longer fresh,</td><td> </td><td class="right">   the requesting client, and the received response is no longer fresh,</td><td class="lineno" valign="top"></td></tr>
364      <tr><td class="lineno" valign="top"></td><td class="left">   the cache SHOULD forward it to the requesting client without adding a</td><td> </td><td class="right">   the cache SHOULD forward it to the requesting client without adding a</td><td class="lineno" valign="top"></td></tr>
365      <tr><td class="lineno" valign="top"></td><td class="left">   new Warning (but without removing any existing Warning headers).  A</td><td> </td><td class="right">   new Warning (but without removing any existing Warning headers).  A</td><td class="lineno" valign="top"></td></tr>
366      <tr><td class="lineno" valign="top"></td><td class="left">   cache SHOULD NOT attempt to validate a response simply because that</td><td> </td><td class="right">   cache SHOULD NOT attempt to validate a response simply because that</td><td class="lineno" valign="top"></td></tr>
367      <tr><td class="lineno" valign="top"></td><td class="left">   response became stale in transit.</td><td> </td><td class="right">   response became stale in transit.</td><td class="lineno" valign="top"></td></tr>
368      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
369      <tr><td class="lineno" valign="top"></td><td class="left">2.4.  Validation Model</td><td> </td><td class="right">2.4.  Validation Model</td><td class="lineno" valign="top"></td></tr>
370      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
371      <tr><td><a name="diff0020" /></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">Checking with</span> the origin server to <span class="delete">see if</span> a <span class="delete">stale or otherwise</span></td><td> </td><td class="rblock">   <span class="insert">When a cache has one or more stored responses for a requested URI,</span></td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   unusable cached</span> response <span class="delete">can</span> be <span class="delete">reused</span> is <span class="delete">called</span> "validating" or</td><td> </td><td class="rblock"><span class="insert">   but cannot serve any of them (e.g., because they are not fresh, or</span></td><td class="lineno" valign="top"></td></tr>
374      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">"revalidating."  Doing so potentially avoids the overhead of</span></td><td> </td><td class="rblock"><span class="insert">   one cannot be selected; see Section 2.6), it can use the conditional</span></td><td class="lineno" valign="top"></td></tr>
375      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   retransmitting the response body when</span> the stored <span class="delete">response is valid.</span></td><td> </td><td class="rblock"><span class="insert">   request mechanism [Part4] in the forwarded request to give</span> the origin</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">   server <span class="insert">an opportunity</span> to <span class="insert">both select</span> a <span class="insert">valid stored</span> response <span class="insert">to</span> be</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">used, and to update it.  This process</span> is <span class="insert">known as</span> "validating" or</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">"revalidating"</span> the stored <span class="insert">response.</span></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="diff0021" /></td></tr>
381      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">HTTP's conditional request mechanism [Part4] is used for this</span></td><td> </td><td class="rblock">   When <span class="insert">sending</span> such <span class="insert">a conditional request,</span> the <span class="insert">cache SHOULD add</span> an <span class="insert">If-</span></td><td class="lineno" valign="top"></td></tr>
382      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   purpose.</span>  When <span class="delete">a stored response includes one or more validators,</span></td><td> </td><td class="rblock"><span class="insert">   Modified-Since header whose value is that of the</span> Last-Modified header</td><td class="lineno" valign="top"></td></tr>
383      <tr><td class="lineno" valign="top"></td><td class="lblock">   such <span class="delete">as</span> the <span class="delete">field values of</span> an <span class="delete">ETag or</span> Last-Modified header <span class="delete">field,</span></td><td> </td><td class="rblock">   <span class="insert">from the selected (see Section 2.6) stored response, if available.</span></td><td class="lineno" valign="top"></td></tr>
384      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   then a validating request</span> SHOULD be <span class="delete">made conditional to those</span> field</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">   <span class="delete">values.</span></td><td> </td><td class="rblock"><span class="insert">   Additionally, the cache SHOULD add an If-None-Match header whose</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 is that of the ETag header(s) from all responses stored for the</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"><span class="insert">   requested URI, if present.  However, if any of the stored responses</span></td><td class="lineno" valign="top"></td></tr>
388      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   contains only partial content, its entity-tag</span> SHOULD <span class="insert">NOT</span> be <span class="insert">included</span></td><td class="lineno" valign="top"></td></tr>
389      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   in the If-None-Match header</span> field <span class="insert">unless the request is for a range</span></td><td class="lineno" valign="top"></td></tr>
390      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   that would be fully satisfied by that stored response.</span></td><td class="lineno" valign="top"></td></tr>
391      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
392      <tr><td class="lineno" valign="top"></td><td class="left">   A 304 (Not Modified) response status code indicates that the stored</td><td> </td><td class="right">   A 304 (Not Modified) response status code indicates that the stored</td><td class="lineno" valign="top"></td></tr>
393      <tr><td class="lineno" valign="top"></td><td class="left">   response can be updated and reused; see Section 2.7.</td><td> </td><td class="right">   response can be updated and reused; see Section 2.7.</td><td class="lineno" valign="top"></td></tr>
394      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
395      <tr><td><a name="diff0022" /></td></tr>
396      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">If instead the cache receives a</span> full response (i.e., one with a</td><td> </td><td class="rblock">   <span class="insert">A</span> full response (i.e., one with a response <span class="insert">body) indicates that none</span></td><td class="lineno" valign="top"></td></tr>
397      <tr><td class="lineno" valign="top"></td><td class="lblock">   response <span class="delete">body), it</span> is used to satisfy the request and replace the</td><td> </td><td class="rblock"><span class="insert">   of the stored responses nominated in the conditional request is</span></td><td class="lineno" valign="top"></td></tr>
398      <tr><td class="lineno" valign="top"></td><td class="lblock">   stored response. <span class="delete">[[anchor8:</span> Should there be a requirement here?]]</td><td> </td><td class="rblock"><span class="insert">   suitable.  Instead, the full response</span> is used <span class="insert">both</span> to satisfy the</td><td class="lineno" valign="top"></td></tr>
399      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   request and replace the stored response. <span class="insert">[[anchor5:</span> Should there be a</td><td class="lineno" valign="top"></td></tr>
400      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   requirement here?]]</td><td class="lineno" valign="top"></td></tr>
401      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
402      <tr><td class="lineno" valign="top"></td><td class="left">   If a cache receives a 5xx response while attempting to validate a</td><td> </td><td class="right">   If a cache receives a 5xx response while attempting to validate a</td><td class="lineno" valign="top"></td></tr>
403      <tr><td class="lineno" valign="top"></td><td class="left">   response, it MAY either forward this response to the requesting</td><td> </td><td class="right">   response, it MAY either forward this response to the requesting</td><td class="lineno" valign="top"></td></tr>
404      <tr><td class="lineno" valign="top"></td><td class="left">   client, or act as if the server failed to respond.  In the latter</td><td> </td><td class="right">   client, or act as if the server failed to respond.  In the latter</td><td class="lineno" valign="top"></td></tr>
405      <tr><td><a name="diff0023" /></td></tr>
406      <tr><td class="lineno" valign="top"></td><td class="lblock">   case, it MAY return a previously stored response <span class="delete">(which SHOULD</span></td><td> </td><td class="rblock">   case, it MAY return a previously stored response <span class="insert">(see</span> Section <span class="insert">2.3.3).</span></td><td class="lineno" valign="top"></td></tr>
407      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   include the 111 warn-code; see</span> Section <span class="delete">3.6) unless</span> the stored</td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
408      <tr><td class="lineno" valign="top"></td><td class="lblock">   response <span class="delete">includes</span> the <span class="delete">"must-revalidate" cache directive (see</span></td><td> </td><td class="rblock"><span class="insert">   If a cache receives a successful response whose Content-Location</span></td><td class="lineno" valign="top"></td></tr>
409      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Section 2.3.3).</span></td><td> </td><td class="rblock"><span class="insert">   field matches that of an existing stored response for the same</span></td><td class="lineno" valign="top"></td></tr>
410      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Request-URI, whose entity-tag differs from that of</span> the <span class="insert">existing</span></td><td class="lineno" valign="top"></td></tr>
411      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   stored <span class="insert">response, and whose Date is more recent than that of the</span></td><td class="lineno" valign="top"></td></tr>
412      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   existing response, the existing</span> response <span class="insert">SHOULD NOT be returned in</span></td><td class="lineno" valign="top"></td></tr>
413      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   response to future requests and SHOULD be deleted from</span> the <span class="insert">cache.</span></td><td class="lineno" valign="top"></td></tr>
414      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   [[anchor6: DISCUSS: Not sure if this is necessary.]]</span></td><td class="lineno" valign="top"></td></tr>
415      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
416      <tr><td class="lineno" valign="top"></td><td class="left">2.5.  Request Methods that Invalidate</td><td> </td><td class="right">2.5.  Request Methods that Invalidate</td><td class="lineno" valign="top"></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
418      <tr><td class="lineno" valign="top"></td><td class="left">   Because unsafe methods (Section 7.1.1 of [Part2]) have the potential</td><td> </td><td class="right">   Because unsafe methods (Section 7.1.1 of [Part2]) have the potential</td><td class="lineno" valign="top"></td></tr>
419      <tr><td class="lineno" valign="top"></td><td class="left">   for changing state on the origin server, intervening caches can use</td><td> </td><td class="right">   for changing state on the origin server, intervening caches can use</td><td class="lineno" valign="top"></td></tr>
420      <tr><td class="lineno" valign="top"></td><td class="left">   them to keep their contents up-to-date.</td><td> </td><td class="right">   them to keep their contents up-to-date.</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">   The following HTTP methods MUST cause a cache to invalidate the</td><td> </td><td class="right">   The following HTTP methods MUST cause a cache to invalidate the</td><td class="lineno" valign="top"></td></tr>
423      <tr><td><a name="diff0024" /></td></tr>
424      <tr><td class="lineno" valign="top"></td><td class="lblock">   Request-URI as well as the Location and <span class="delete">Content-Location</span> headers (if</td><td> </td><td class="rblock">   Request-URI as well as the <span class="insert">URI(s) in the</span> Location and <span class="insert">Content-</span></td><td class="lineno" valign="top"></td></tr>
425      <tr><td class="lineno" valign="top"></td><td class="lblock">   present):</td><td> </td><td class="rblock"><span class="insert">   Location</span> headers (if present):</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">   o  PUT</td><td> </td><td class="right">   o  PUT</td><td class="lineno" valign="top"></td></tr>
428      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
429      <tr><td class="lineno" valign="top"></td><td class="left">   o  DELETE</td><td> </td><td class="right">   o  DELETE</td><td class="lineno" valign="top"></td></tr>
430      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
431      <tr><td class="lineno" valign="top"></td><td class="left">   o  POST</td><td> </td><td class="right">   o  POST</td><td class="lineno" valign="top"></td></tr>
432      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
433      <tr><td><a name="diff0025" /></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="lblock">   An invalidation based on <span class="delete">the URI in</span> a Location or Content-Location</td><td> </td><td class="rblock">   An invalidation based on <span class="insert">a URI from</span> a Location or Content-Location</td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="left">   header MUST NOT be performed if the host part of that URI differs</td><td> </td><td class="right">   header MUST NOT be performed if the host part of that URI differs</td><td class="lineno" valign="top"></td></tr>
436      <tr><td class="lineno" valign="top"></td><td class="left">   from the host part in the Request-URI.  This helps prevent denial of</td><td> </td><td class="right">   from the host part in the Request-URI.  This helps prevent denial of</td><td class="lineno" valign="top"></td></tr>
437      <tr><td class="lineno" valign="top"></td><td class="left">   service attacks.</td><td> </td><td class="right">   service attacks.</td><td class="lineno" valign="top"></td></tr>
438      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
439      <tr><td><a name="diff0026" /></td></tr>
440      <tr><td class="lineno" valign="top"></td><td class="lblock">   [[anchor<span class="delete">9</span>: TODO: "host part" needs to be specified better.]]</td><td> </td><td class="rblock">   [[anchor<span class="insert">7</span>: TODO: "host part" needs to be specified better.]]</td><td class="lineno" valign="top"></td></tr>
441      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
442      <tr><td class="lineno" valign="top"></td><td class="left">   A cache that passes through requests for methods it does not</td><td> </td><td class="right">   A cache that passes through requests for methods it does not</td><td class="lineno" valign="top"></td></tr>
443      <tr><td class="lineno" valign="top"></td><td class="left">   understand SHOULD invalidate the Request-URI.</td><td> </td><td class="right">   understand SHOULD invalidate the Request-URI.</td><td class="lineno" valign="top"></td></tr>
444      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
445      <tr><td class="lineno" valign="top"></td><td class="left">   Here, "invalidate" means that the cache will either remove all stored</td><td> </td><td class="right">   Here, "invalidate" means that the cache will either remove all stored</td><td class="lineno" valign="top"></td></tr>
446      <tr><td class="lineno" valign="top"></td><td class="left">   responses related to the Request-URI, or will mark these as "invalid"</td><td> </td><td class="right">   responses related to the Request-URI, or will mark these as "invalid"</td><td class="lineno" valign="top"></td></tr>
447      <tr><td class="lineno" valign="top"></td><td class="left">   and in need of a mandatory validation before they can be returned in</td><td> </td><td class="right">   and in need of a mandatory validation before they can be returned in</td><td class="lineno" valign="top"></td></tr>
448      <tr><td class="lineno" valign="top"></td><td class="left">   response to a subsequent request.</td><td> </td><td class="right">   response to a subsequent request.</td><td class="lineno" valign="top"></td></tr>
449      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
450      <tr><td class="lineno" valign="top"></td><td class="left">   Note that this does not guarantee that all appropriate responses are</td><td> </td><td class="right">   Note that this does not guarantee that all appropriate responses are</td><td class="lineno" valign="top"></td></tr>
451      <tr><td class="lineno" valign="top"></td><td class="left">   invalidated.  For example, the request that caused the change at the</td><td> </td><td class="right">   invalidated.  For example, the request that caused the change at the</td><td class="lineno" valign="top"></td></tr>
452      <tr><td class="lineno" valign="top"></td><td class="left">   origin server might not have gone through the cache where a response</td><td> </td><td class="right">   origin server might not have gone through the cache where a response</td><td class="lineno" valign="top"></td></tr>
453      <tr><td class="lineno" valign="top"></td><td class="left">   is stored.</td><td> </td><td class="right">   is stored.</td><td class="lineno" valign="top"></td></tr>
454      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
455      <tr><td><a name="diff0027" /></td></tr>
456      <tr><td class="lineno" valign="top"></td><td class="lblock">   [[anchor<span class="delete">10</span>: TODO: specify that only successful (2xx, 3xx?) responses</td><td> </td><td class="rblock">   [[anchor<span class="insert">8</span>: TODO: specify that only successful (2xx, 3xx?) responses</td><td class="lineno" valign="top"></td></tr>
457      <tr><td class="lineno" valign="top"></td><td class="left">   invalidate.]]</td><td> </td><td class="right">   invalidate.]]</td><td class="lineno" valign="top"></td></tr>
458      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
459      <tr><td class="lineno" valign="top"></td><td class="left">2.6.  Caching Negotiated Responses</td><td> </td><td class="right">2.6.  Caching Negotiated Responses</td><td class="lineno" valign="top"></td></tr>
460      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
461      <tr><td><a name="diff0028" /></td></tr>
462      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">Use of server-driven content negotiation (Section 4.1 of [Part3])</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
463      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   alters the conditions under which a cache can use the response for</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
464      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   subsequent requests.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
465      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                                         </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
466      <tr><td class="lineno" valign="top"></td><td class="left">   When a cache receives a request that can be satisfied by a stored</td><td> </td><td class="right">   When a cache receives a request that can be satisfied by a stored</td><td class="lineno" valign="top"></td></tr>
467      <tr><td><a name="diff0029" /></td></tr>
468      <tr><td class="lineno" valign="top"></td><td class="lblock">   response that <span class="delete">includes</span> a Vary header field (Section 3.5), it MUST NOT</td><td> </td><td class="rblock">   response that <span class="insert">has</span> a Vary header field (Section 3.5), it MUST NOT use</td><td class="lineno" valign="top"></td></tr>
469      <tr><td class="lineno" valign="top"></td><td class="lblock">   use that response unless all of the selecting request-headers in the</td><td> </td><td class="rblock">   that response unless all of the selecting request-headers <span class="insert">nominated</span></td><td class="lineno" valign="top"></td></tr>
470      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">presented</span> request <span class="delete">match</span> the <span class="delete">corresponding</span> stored <span class="delete">request-headers from</span></td><td> </td><td class="rblock"><span class="insert">   by the Vary header match</span> in <span class="insert">both</span> the <span class="insert">original</span> request <span class="insert">(i.e., that</span></td><td class="lineno" valign="top"></td></tr>
471      <tr><td class="lineno" valign="top"></td><td class="lblock">   the <span class="delete">original</span> request.</td><td> </td><td class="rblock"><span class="insert">   associated with</span> the stored <span class="insert">response), and</span> the <span class="insert">presented</span> request.</td><td class="lineno" valign="top"></td></tr>
472      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
473      <tr><td class="lineno" valign="top"></td><td class="left">   The selecting request-headers from two requests are defined to match</td><td> </td><td class="right">   The selecting request-headers from two requests are defined to match</td><td class="lineno" valign="top"></td></tr>
474      <tr><td class="lineno" valign="top"></td><td class="left">   if and only if the selecting request-headers in the first request can</td><td> </td><td class="right">   if and only if the selecting request-headers in the first request can</td><td class="lineno" valign="top"></td></tr>
475      <tr><td class="lineno" valign="top"></td><td class="left">   be transformed to the selecting request-headers in the second request</td><td> </td><td class="right">   be transformed to the selecting request-headers in the second request</td><td class="lineno" valign="top"></td></tr>
476      <tr><td><a name="diff0030" /></td></tr>
477      <tr><td class="lineno" valign="top"></td><td class="lblock">   by adding or removing linear white space <span class="delete">[[anchor11:</span> [ref]]] at</td><td> </td><td class="rblock">   by adding or removing linear white space <span class="insert">[[anchor9:</span> [ref]]] at places</td><td class="lineno" valign="top"></td></tr>
478      <tr><td class="lineno" valign="top"></td><td class="lblock">   places where this is allowed by the corresponding ABNF, and/or</td><td> </td><td class="rblock">   where this is allowed by the corresponding ABNF, and/or combining</td><td class="lineno" valign="top"></td></tr>
479      <tr><td class="lineno" valign="top"></td><td class="lblock">   combining multiple message-header fields with the same field name</td><td> </td><td class="rblock">   multiple message-header fields with the same field name following the</td><td class="lineno" valign="top"></td></tr>
480      <tr><td class="lineno" valign="top"></td><td class="lblock">   following the rules about message headers in Section 4.2 of [Part1].</td><td> </td><td class="rblock">   rules about message headers in Section 4.2 of [Part1].</td><td class="lineno" valign="top"></td></tr>
481      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[anchor12: DISCUSS: header-specific canonicalisation]]</span></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
482      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">If a header field is absent from a request, it can only match another</span></td><td class="lineno" valign="top"></td></tr>
483      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   request if it is also absent there.</span></td><td class="lineno" valign="top"></td></tr>
484      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
485      <tr><td class="lineno" valign="top"></td><td class="left">   A Vary header field-value of "*" always fails to match, and</td><td> </td><td class="right">   A Vary header field-value of "*" always fails to match, and</td><td class="lineno" valign="top"></td></tr>
486      <tr><td class="lineno" valign="top"></td><td class="left">   subsequent requests to that resource can only be properly interpreted</td><td> </td><td class="right">   subsequent requests to that resource can only be properly interpreted</td><td class="lineno" valign="top"></td></tr>
487      <tr><td class="lineno" valign="top"></td><td class="left">   by the origin server.</td><td> </td><td class="right">   by the origin server.</td><td class="lineno" valign="top"></td></tr>
488      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
489      <tr><td><a name="diff0031" /></td></tr>
490      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">If no</span> stored response <span class="delete">matches, the cache MAY forward the presented</span></td><td> </td><td class="rblock">   <span class="insert">The</span> stored response with <span class="insert">matching selecting request-headers</span> is <span class="insert">known</span></td><td class="lineno" valign="top"></td></tr>
491      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   request to the origin server in a conditional request, and SHOULD</span></td><td> </td><td class="rblock"><span class="insert">   as the selected</span> response.</td><td class="lineno" valign="top"></td></tr>
492      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   include all ETags stored</span> with <span class="delete">potentially suitable responses in an</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
493      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   If-None-Match request header.  If the server responds with 304 (Not</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
494      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Modified) and includes an entity tag or Content-Location that</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
495      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   indicates the entity to be used, that cached response MUST be used to</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
496      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   satisfy the presented request, and SHOULD be used to update the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
497      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   corresponding stored response; see Section 2.7.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
498      <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>
499      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   If any of the stored responses contains only partial content, its</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
500      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   entity-tag SHOULD NOT be included in the If-None-Match header field</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
501      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   unless the request</span> is <span class="delete">for a range that would be fully satisfied by</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
502      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   that stored</span> response.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
503      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
504      <tr><td><a name="diff0032" /></td></tr>
505      <tr><td class="lineno" valign="top"></td><td class="lblock">   If <span class="delete">a cache receives a successful response whose Content-Location</span></td><td> </td><td class="rblock">   If <span class="insert">no selected</span> response is <span class="insert">available,</span> the <span class="insert">cache MAY forward</span> the</td><td class="lineno" valign="top"></td></tr>
506      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   field matches that of an existing stored</span> response <span class="delete">for the same</span></td><td> </td><td class="rblock">   <span class="insert">presented request</span> to the <span class="insert">origin server in a conditional request; see</span></td><td class="lineno" valign="top"></td></tr>
507      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Request-URI, whose entity-tag differs from that of the existing</span></td><td> </td><td class="rblock"><span class="insert">   Section 2.4.</span></td><td class="lineno" valign="top"></td></tr>
508      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   stored response, and whose Date</span> is <span class="delete">more recent than that of</span> the</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
509      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">existing response,</span> the <span class="delete">existing response SHOULD NOT be returned in</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
510      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   response</span> to <span class="delete">future requests and SHOULD be deleted from</span> the</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
511      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">cache.[[anchor13: DISCUSS: Not sure if this is necessary.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
512      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
513      <tr><td class="lineno" valign="top"></td><td class="left">2.7.  Combining Responses</td><td> </td><td class="right">2.7.  Combining Responses</td><td class="lineno" valign="top"></td></tr>
514      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
515      <tr><td class="lineno" valign="top"></td><td class="left">   When a cache receives a 304 (Not Modified) response or a 206 (Partial</td><td> </td><td class="right">   When a cache receives a 304 (Not Modified) response or a 206 (Partial</td><td class="lineno" valign="top"></td></tr>
516      <tr><td><a name="diff0033" /></td></tr>
517      <tr><td class="lineno" valign="top"></td><td class="lblock">   Content) <span class="delete">response,</span> it needs to <span class="delete">update</span> the stored response with the</td><td> </td><td class="rblock">   Content) <span class="insert">response (in this section, the "new" response"),</span> it needs to</td><td class="lineno" valign="top"></td></tr>
518      <tr><td class="lineno" valign="top"></td><td class="lblock">   new one, so that the updated response can be <span class="delete">sent</span> to the <span class="delete">client.</span></td><td> </td><td class="rblock">   <span class="insert">created an updated response by combining</span> the stored response with the</td><td class="lineno" valign="top"></td></tr>
519      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   new one, so that the updated response can be <span class="insert">used</span> to <span class="insert">satisfy</span> the</td><td class="lineno" valign="top"></td></tr>
520      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">request.</span></td><td class="lineno" valign="top"></td></tr>
521      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
522      <tr><td><a name="diff0034" /></td></tr>
523      <tr><td class="lineno" valign="top"></td><td class="lblock">   If the <span class="delete">status code is 304 (Not Modified), the cache SHOULD use the</span></td><td> </td><td class="rblock">   If the <span class="insert">new response contains an ETag, it identifies</span> the stored</td><td class="lineno" valign="top"></td></tr>
524      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   stored entity-body as the updated entity-body.  If the status code is</span></td><td> </td><td class="rblock">   response <span class="insert">to use. [[anchor10: may need language about Content-Location</span></td><td class="lineno" valign="top"></td></tr>
525      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   206 (Partial Content) and the ETag or Last-Modified headers match</span></td><td> </td><td class="rblock"><span class="insert">   here]][[anchor11: cover case where INM</span> with <span class="insert">multiple etags was sent]]</span></td><td class="lineno" valign="top"></td></tr>
526      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   exactly, the cache MAY combine the stored entity-body in</span> the stored</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
527      <tr><td class="lineno" valign="top"></td><td class="lblock">   response with <span class="delete">the updated entity-body received in the response and</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
528      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   use the result as the updated entity-body (see Section 4 of [Part5]).</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
529      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
530      <tr><td><a name="diff0035" /></td></tr>
531      <tr><td class="lineno" valign="top"></td><td class="lblock">   The stored response headers are used <span class="delete">for</span> the updated response, except</td><td> </td><td class="rblock">   <span class="insert">If the status code is 206 (partial content), both the stored and new</span></td><td class="lineno" valign="top"></td></tr>
532      <tr><td class="lineno" valign="top"></td><td class="lblock">   that</td><td> </td><td class="rblock"><span class="insert">   responses MUST have ETags, and those ETags MUST match using the</span></td><td class="lineno" valign="top"></td></tr>
533      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   strong comparison function (see Section 4 of [Part4]).  Otherwise,</span></td><td class="lineno" valign="top"></td></tr>
534      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   the responses MUST NOT be combined.</span></td><td class="lineno" valign="top"></td></tr>
535      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
536      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   The stored response headers are used <span class="insert">as those of</span> the updated</td><td class="lineno" valign="top"></td></tr>
537      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   response, except that</td><td class="lineno" valign="top"></td></tr>
538      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
539      <tr><td class="lineno" valign="top"></td><td class="left">   o  any stored Warning headers with warn-code 1xx (see Section 3.6)</td><td> </td><td class="right">   o  any stored Warning headers with warn-code 1xx (see Section 3.6)</td><td class="lineno" valign="top"></td></tr>
540      <tr><td><a name="diff0036" /></td></tr>
541      <tr><td class="lineno" valign="top"></td><td class="lblock">      MUST be deleted from the stored response and the <span class="delete">forwarded</span></td><td> </td><td class="rblock">      MUST be deleted from the stored response and the <span class="insert">updated</span> response.</td><td class="lineno" valign="top"></td></tr>
542      <tr><td class="lineno" valign="top"></td><td class="lblock">      response.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
543      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
544      <tr><td class="lineno" valign="top"></td><td class="left">   o  any stored Warning headers with warn-code 2xx MUST be retained in</td><td> </td><td class="right">   o  any stored Warning headers with warn-code 2xx MUST be retained in</td><td class="lineno" valign="top"></td></tr>
545      <tr><td><a name="diff0037" /></td></tr>
546      <tr><td class="lineno" valign="top"></td><td class="lblock">      the stored response and the <span class="delete">forward</span>ed response.</td><td> </td><td class="rblock">      the stored response and the <span class="insert">updat</span>ed response.</td><td class="lineno" valign="top"></td></tr>
547      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
548      <tr><td><a name="diff0038" /></td></tr>
549      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  any headers provided in the <span class="delete">304 or 206</span> response MUST replace the</td><td> </td><td class="rblock">   o  any headers provided in the <span class="insert">new</span> response MUST replace the</td><td class="lineno" valign="top"></td></tr>
550      <tr><td class="lineno" valign="top"></td><td class="left">      corresponding headers from the stored response.</td><td> </td><td class="right">      corresponding headers from the stored response.</td><td class="lineno" valign="top"></td></tr>
551      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
552      <tr><td><a name="diff0039" /></td></tr>
553      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">A cache MUST also replace any stored headers with corresponding</span></td><td> </td><td class="rblock">   If a header field-name in the <span class="insert">new</span> response matches more than one</td><td class="lineno" valign="top"></td></tr>
554      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   headers received in the incoming response, except for Warning headers</span></td><td> </td><td class="rblock">   header in the stored response, all such <span class="insert">stored</span> headers MUST be</td><td class="lineno" valign="top"></td></tr>
555      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   as described immediately above.</span>  If a header field-name in the</td><td> </td><td class="rblock">   replaced.</td><td class="lineno" valign="top"></td></tr>
556      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">incoming</span> response matches more than one header in the stored</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
557      <tr><td class="lineno" valign="top"></td><td class="lblock">   response, all such <span class="delete">old</span> headers MUST be replaced.  <span class="delete">It MAY store the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
558      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   combined entity-body.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
559      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
560      <tr><td><a name="diff0040" /></td></tr>
561      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[anchor14:</span> ISSUE: discuss how to handle HEAD updates]]</td><td> </td><td class="rblock">   <span class="insert">The updated response can [[[[anchor12: requirement?]]]] be used to</span></td><td class="lineno" valign="top"></td></tr>
562      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   replace the stored response in cache.  In the case of a 206 response,</span></td><td class="lineno" valign="top"></td></tr>
563      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   the combined entity-body MAY be stored.</span></td><td class="lineno" valign="top"></td></tr>
564      <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>
565      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   [[anchor13:</span> ISSUE: discuss how to handle HEAD updates]]</td><td class="lineno" valign="top"></td></tr>
566      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
567      <tr><td class="lineno" valign="top"></td><td class="left">3.  Header Field Definitions</td><td> </td><td class="right">3.  Header Field Definitions</td><td class="lineno" valign="top"></td></tr>
568      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
569      <tr><td class="lineno" valign="top"></td><td class="left">   This section defines the syntax and semantics of HTTP/1.1 header</td><td> </td><td class="right">   This section defines the syntax and semantics of HTTP/1.1 header</td><td class="lineno" valign="top"></td></tr>
570      <tr><td class="lineno" valign="top"></td><td class="left">   fields related to caching.</td><td> </td><td class="right">   fields related to caching.</td><td class="lineno" valign="top"></td></tr>
571      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
572      <tr><td class="lineno" valign="top"></td><td class="left">   For entity-header fields, both sender and recipient refer to either</td><td> </td><td class="right">   For entity-header fields, both sender and recipient refer to either</td><td class="lineno" valign="top"></td></tr>
573      <tr><td class="lineno" valign="top"></td><td class="left">   the client or the server, depending on who sends and who receives the</td><td> </td><td class="right">   the client or the server, depending on who sends and who receives the</td><td class="lineno" valign="top"></td></tr>
574      <tr><td class="lineno" valign="top"></td><td class="left">   entity.</td><td> </td><td class="right">   entity.</td><td class="lineno" valign="top"></td></tr>
575      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
576      <tr><td class="lineno" valign="top"></td><td class="left">3.1.  Age</td><td> </td><td class="right">3.1.  Age</td><td class="lineno" valign="top"></td></tr>
577      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
578      <tr><td class="lineno" valign="top"></td><td class="left">   The response-header field "Age" conveys the sender's estimate of the</td><td> </td><td class="right">   The response-header field "Age" conveys the sender's estimate of the</td><td class="lineno" valign="top"></td></tr>
579      <tr><td class="lineno" valign="top"></td><td class="left">   amount of time since the response (or its validation) was generated</td><td> </td><td class="right">   amount of time since the response (or its validation) was generated</td><td class="lineno" valign="top"></td></tr>
580      <tr><td class="lineno" valign="top"></td><td class="left">   at the origin server.  Age values are calculated as specified in</td><td> </td><td class="right">   at the origin server.  Age values are calculated as specified in</td><td class="lineno" valign="top"></td></tr>
581      <tr><td class="lineno" valign="top"></td><td class="left">   Section 2.3.2.</td><td> </td><td class="right">   Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
582      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
583      <tr><td class="lineno" valign="top"></td><td class="left">     Age   = "Age" ":" OWS Age-v</td><td> </td><td class="right">     Age   = "Age" ":" OWS Age-v</td><td class="lineno" valign="top"></td></tr>
584      <tr><td class="lineno" valign="top"></td><td class="left">     Age-v = delta-seconds</td><td> </td><td class="right">     Age-v = delta-seconds</td><td class="lineno" valign="top"></td></tr>
585      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
586      <tr><td><a name="diff0041" /></td></tr>
587      <tr><td class="lineno" valign="top"></td><td class="lblock">   Age field-values are non-negative <span class="delete">decimal</span> integers, representing time</td><td> </td><td class="rblock">   Age field-values are non-negative integers, representing time in</td><td class="lineno" valign="top"></td></tr>
588      <tr><td class="lineno" valign="top"></td><td class="lblock">   in seconds.</td><td> </td><td class="rblock">   seconds.</td><td class="lineno" valign="top"></td></tr>
589      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
590      <tr><td class="lineno" valign="top"></td><td class="left">     delta-seconds  = 1*DIGIT</td><td> </td><td class="right">     delta-seconds  = 1*DIGIT</td><td class="lineno" valign="top"></td></tr>
591      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
592      <tr><td class="lineno" valign="top"></td><td class="left">   If a cache receives a value larger than the largest positive integer</td><td> </td><td class="right">   If a cache receives a value larger than the largest positive integer</td><td class="lineno" valign="top"></td></tr>
593      <tr><td class="lineno" valign="top"></td><td class="left">   it can represent, or if any of its age calculations overflows, it</td><td> </td><td class="right">   it can represent, or if any of its age calculations overflows, it</td><td class="lineno" valign="top"></td></tr>
594      <tr><td class="lineno" valign="top"></td><td class="left">   MUST transmit an Age header with a field-value of 2147483648 (2^31).</td><td> </td><td class="right">   MUST transmit an Age header with a field-value of 2147483648 (2^31).</td><td class="lineno" valign="top"></td></tr>
595      <tr><td class="lineno" valign="top"></td><td class="left">   Caches SHOULD use an arithmetic type of at least 31 bits of range.</td><td> </td><td class="right">   Caches SHOULD use an arithmetic type of at least 31 bits of range.</td><td class="lineno" valign="top"></td></tr>
596      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
597      <tr><td class="lineno" valign="top"></td><td class="left">   The presence of an Age header field in a response implies that a</td><td> </td><td class="right">   The presence of an Age header field in a response implies that a</td><td class="lineno" valign="top"></td></tr>
598      <tr><td class="lineno" valign="top"></td><td class="left">   response is not first-hand.  However, the converse is not true, since</td><td> </td><td class="right">   response is not first-hand.  However, the converse is not true, since</td><td class="lineno" valign="top"></td></tr>
599      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
600      <tr bgcolor="gray" ><td></td><th><a name="part-l12" /><small>skipping to change at</small><em> page 19, line 13</em></th><th> </th><th><a name="part-r12" /><small>skipping to change at</small><em> page 19, line 21</em></th><td></td></tr>
601      <tr><td class="lineno" valign="top"></td><td class="left">      client is not willing to accept a stale response.</td><td> </td><td class="right">      client is not willing to accept a stale response.</td><td class="lineno" valign="top"></td></tr>
602      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
603      <tr><td class="lineno" valign="top"></td><td class="left">   max-stale</td><td> </td><td class="right">   max-stale</td><td class="lineno" valign="top"></td></tr>
604      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
605      <tr><td class="lineno" valign="top"></td><td class="left">      The max-stale request directive indicates that the client is</td><td> </td><td class="right">      The max-stale request directive indicates that the client is</td><td class="lineno" valign="top"></td></tr>
606      <tr><td class="lineno" valign="top"></td><td class="left">      willing to accept a response that has exceeded its expiration</td><td> </td><td class="right">      willing to accept a response that has exceeded its expiration</td><td class="lineno" valign="top"></td></tr>
607      <tr><td class="lineno" valign="top"></td><td class="left">      time.  If max-stale is assigned a value, then the client is</td><td> </td><td class="right">      time.  If max-stale is assigned a value, then the client is</td><td class="lineno" valign="top"></td></tr>
608      <tr><td class="lineno" valign="top"></td><td class="left">      willing to accept a response that has exceeded its expiration time</td><td> </td><td class="right">      willing to accept a response that has exceeded its expiration time</td><td class="lineno" valign="top"></td></tr>
609      <tr><td class="lineno" valign="top"></td><td class="left">      by no more than the specified number of seconds.  If no value is</td><td> </td><td class="right">      by no more than the specified number of seconds.  If no value is</td><td class="lineno" valign="top"></td></tr>
610      <tr><td class="lineno" valign="top"></td><td class="left">      assigned to max-stale, then the client is willing to accept a</td><td> </td><td class="right">      assigned to max-stale, then the client is willing to accept a</td><td class="lineno" valign="top"></td></tr>
611      <tr><td><a name="diff0042" /></td></tr>
612      <tr><td class="lineno" valign="top"></td><td class="lblock">      stale response of any age. [[anchor1<span class="delete">5</span>: of any staleness? --mnot]]</td><td> </td><td class="rblock">      stale response of any age. [[anchor1<span class="insert">4</span>: of any staleness? --mnot]]</td><td class="lineno" valign="top"></td></tr>
613      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
614      <tr><td class="lineno" valign="top"></td><td class="left">   min-fresh</td><td> </td><td class="right">   min-fresh</td><td class="lineno" valign="top"></td></tr>
615      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
616      <tr><td class="lineno" valign="top"></td><td class="left">      The min-fresh request directive indicates that the client is</td><td> </td><td class="right">      The min-fresh request directive indicates that the client is</td><td class="lineno" valign="top"></td></tr>
617      <tr><td class="lineno" valign="top"></td><td class="left">      willing to accept a response whose freshness lifetime is no less</td><td> </td><td class="right">      willing to accept a response whose freshness lifetime is no less</td><td class="lineno" valign="top"></td></tr>
618      <tr><td class="lineno" valign="top"></td><td class="left">      than its current age plus the specified time in seconds.  That is,</td><td> </td><td class="right">      than its current age plus the specified time in seconds.  That is,</td><td class="lineno" valign="top"></td></tr>
619      <tr><td class="lineno" valign="top"></td><td class="left">      the client wants a response that will still be fresh for at least</td><td> </td><td class="right">      the client wants a response that will still be fresh for at least</td><td class="lineno" valign="top"></td></tr>
620      <tr><td class="lineno" valign="top"></td><td class="left">      the specified number of seconds.</td><td> </td><td class="right">      the specified number of seconds.</td><td class="lineno" valign="top"></td></tr>
621      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
622      <tr><td class="lineno" valign="top"></td><td class="left">   no-transform</td><td> </td><td class="right">   no-transform</td><td class="lineno" valign="top"></td></tr>
623      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
624      <tr bgcolor="gray" ><td></td><th><a name="part-l13" /><small>skipping to change at</small><em> page 20, line 51</em></th><th> </th><th><a name="part-r13" /><small>skipping to change at</small><em> page 20, line 51</em></th><td></td></tr>
625      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
626      <tr><td class="lineno" valign="top"></td><td class="left">   no-cache</td><td> </td><td class="right">   no-cache</td><td class="lineno" valign="top"></td></tr>
627      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
628      <tr><td class="lineno" valign="top"></td><td class="left">      The no-cache response directive indicates that the response MUST</td><td> </td><td class="right">      The no-cache response directive indicates that the response MUST</td><td class="lineno" valign="top"></td></tr>
629      <tr><td class="lineno" valign="top"></td><td class="left">      NOT be used to satisfy a subsequent request without successful</td><td> </td><td class="right">      NOT be used to satisfy a subsequent request without successful</td><td class="lineno" valign="top"></td></tr>
630      <tr><td class="lineno" valign="top"></td><td class="left">      validation on the origin server.  This allows an origin server to</td><td> </td><td class="right">      validation on the origin server.  This allows an origin server to</td><td class="lineno" valign="top"></td></tr>
631      <tr><td class="lineno" valign="top"></td><td class="left">      prevent caching even by caches that have been configured to return</td><td> </td><td class="right">      prevent caching even by caches that have been configured to return</td><td class="lineno" valign="top"></td></tr>
632      <tr><td class="lineno" valign="top"></td><td class="left">      stale responses.</td><td> </td><td class="right">      stale responses.</td><td class="lineno" valign="top"></td></tr>
633      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
634      <tr><td class="lineno" valign="top"></td><td class="left">      If the no-cache response directive specifies one or more field-</td><td> </td><td class="right">      If the no-cache response directive specifies one or more field-</td><td class="lineno" valign="top"></td></tr>
635      <tr><td><a name="diff0043" /></td></tr>
636      <tr><td class="lineno" valign="top"></td><td class="lblock">      names, this requirement is limited to the field-values asso<span class="delete">sic</span>ated</td><td> </td><td class="rblock">      names, this requirement is limited to the field-values asso<span class="insert">ci</span>ated</td><td class="lineno" valign="top"></td></tr>
637      <tr><td class="lineno" valign="top"></td><td class="left">      with the listed response headers.  That is, the specified field-</td><td> </td><td class="right">      with the listed response headers.  That is, the specified field-</td><td class="lineno" valign="top"></td></tr>
638      <tr><td class="lineno" valign="top"></td><td class="left">      name(s) MUST NOT be sent in the response to a subsequent request</td><td> </td><td class="right">      name(s) MUST NOT be sent in the response to a subsequent request</td><td class="lineno" valign="top"></td></tr>
639      <tr><td class="lineno" valign="top"></td><td class="left">      without successful validation on the origin server.  This allows</td><td> </td><td class="right">      without successful validation on the origin server.  This allows</td><td class="lineno" valign="top"></td></tr>
640      <tr><td class="lineno" valign="top"></td><td class="left">      an origin server to prevent the re-use of certain header fields in</td><td> </td><td class="right">      an origin server to prevent the re-use of certain header fields in</td><td class="lineno" valign="top"></td></tr>
641      <tr><td class="lineno" valign="top"></td><td class="left">      a response, while still allowing caching of the rest of the</td><td> </td><td class="right">      a response, while still allowing caching of the rest of the</td><td class="lineno" valign="top"></td></tr>
642      <tr><td class="lineno" valign="top"></td><td class="left">      response.</td><td> </td><td class="right">      response.</td><td class="lineno" valign="top"></td></tr>
643      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
644      <tr><td class="lineno" valign="top"></td><td class="left">      Note: Most HTTP/1.0 caches will not recognize or obey this</td><td> </td><td class="right">      Note: Most HTTP/1.0 caches will not recognize or obey this</td><td class="lineno" valign="top"></td></tr>
645      <tr><td class="lineno" valign="top"></td><td class="left">      directive.</td><td> </td><td class="right">      directive.</td><td class="lineno" valign="top"></td></tr>
646      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
647      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
648      <tr bgcolor="gray" ><td></td><th><a name="part-l14" /><small>skipping to change at</small><em> page 23, line 26</em></th><th> </th><th><a name="part-r14" /><small>skipping to change at</small><em> page 23, line 26</em></th><td></td></tr>
649      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
650      <tr><td class="lineno" valign="top"></td><td class="left">   The entity-header field "Expires" gives the date/time after which the</td><td> </td><td class="right">   The entity-header field "Expires" gives the date/time after which the</td><td class="lineno" valign="top"></td></tr>
651      <tr><td class="lineno" valign="top"></td><td class="left">   response is considered stale.  See Section 2.3 for further discussion</td><td> </td><td class="right">   response is considered stale.  See Section 2.3 for further discussion</td><td class="lineno" valign="top"></td></tr>
652      <tr><td class="lineno" valign="top"></td><td class="left">   of the freshness model.</td><td> </td><td class="right">   of the freshness model.</td><td class="lineno" valign="top"></td></tr>
653      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
654      <tr><td class="lineno" valign="top"></td><td class="left">   The presence of an Expires field does not imply that the original</td><td> </td><td class="right">   The presence of an Expires field does not imply that the original</td><td class="lineno" valign="top"></td></tr>
655      <tr><td class="lineno" valign="top"></td><td class="left">   resource will change or cease to exist at, before, or after that</td><td> </td><td class="right">   resource will change or cease to exist at, before, or after that</td><td class="lineno" valign="top"></td></tr>
656      <tr><td class="lineno" valign="top"></td><td class="left">   time.</td><td> </td><td class="right">   time.</td><td class="lineno" valign="top"></td></tr>
657      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
658      <tr><td class="lineno" valign="top"></td><td class="left">   The field-value is an absolute date and time as defined by HTTP-date</td><td> </td><td class="right">   The field-value is an absolute date and time as defined by HTTP-date</td><td class="lineno" valign="top"></td></tr>
659      <tr><td><a name="diff0044" /></td></tr>
660      <tr><td class="lineno" valign="top"></td><td class="lblock">   in Section 3.2<span class="delete">.1</span> of [Part1]; it MUST be sent in rfc1123-date format.</td><td> </td><td class="rblock">   in Section 3.2 of [Part1]; it MUST be sent in rfc1123-date format.</td><td class="lineno" valign="top"></td></tr>
661      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
662      <tr><td class="lineno" valign="top"></td><td class="left">     Expires   = "Expires" ":" OWS Expires-v</td><td> </td><td class="right">     Expires   = "Expires" ":" OWS Expires-v</td><td class="lineno" valign="top"></td></tr>
663      <tr><td class="lineno" valign="top"></td><td class="left">     Expires-v = HTTP-date</td><td> </td><td class="right">     Expires-v = HTTP-date</td><td class="lineno" valign="top"></td></tr>
664      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
665      <tr><td class="lineno" valign="top"></td><td class="left">   For example</td><td> </td><td class="right">   For example</td><td class="lineno" valign="top"></td></tr>
666      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
667      <tr><td class="lineno" valign="top"></td><td class="left">     Expires: Thu, 01 Dec 1994 16:00:00 GMT</td><td> </td><td class="right">     Expires: Thu, 01 Dec 1994 16:00:00 GMT</td><td class="lineno" valign="top"></td></tr>
668      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
669      <tr><td class="lineno" valign="top"></td><td class="left">      Note: if a response includes a Cache-Control field with the max-</td><td> </td><td class="right">      Note: if a response includes a Cache-Control field with the max-</td><td class="lineno" valign="top"></td></tr>
670      <tr><td class="lineno" valign="top"></td><td class="left">      age directive (see Section 3.2.2), that directive overrides the</td><td> </td><td class="right">      age directive (see Section 3.2.2), that directive overrides the</td><td class="lineno" valign="top"></td></tr>
671      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
672      <tr bgcolor="gray" ><td></td><th><a name="part-l15" /><small>skipping to change at</small><em> page 29, line 48</em></th><th> </th><th><a name="part-r15" /><small>skipping to change at</small><em> page 29, line 48</em></th><td></td></tr>
673      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
674      <tr><td class="lineno" valign="top"></td><td class="left">   [ISO-8859-1]</td><td> </td><td class="right">   [ISO-8859-1]</td><td class="lineno" valign="top"></td></tr>
675      <tr><td class="lineno" valign="top"></td><td class="left">              International Organization for Standardization,</td><td> </td><td class="right">              International Organization for Standardization,</td><td class="lineno" valign="top"></td></tr>
676      <tr><td class="lineno" valign="top"></td><td class="left">              "Information technology -- 8-bit single-byte coded graphic</td><td> </td><td class="right">              "Information technology -- 8-bit single-byte coded graphic</td><td class="lineno" valign="top"></td></tr>
677      <tr><td class="lineno" valign="top"></td><td class="left">              character sets -- Part 1: Latin alphabet No. 1", ISO/</td><td> </td><td class="right">              character sets -- Part 1: Latin alphabet No. 1", ISO/</td><td class="lineno" valign="top"></td></tr>
678      <tr><td class="lineno" valign="top"></td><td class="left">              IEC 8859-1:1998, 1998.</td><td> </td><td class="right">              IEC 8859-1:1998, 1998.</td><td class="lineno" valign="top"></td></tr>
679      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
680      <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>
681      <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>
682      <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>
683      <tr><td><a name="diff0045" /></td></tr>
684      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Message Parsing", <span class="delete">draft-ietf-httpbis-p1-messaging-06</span></td><td> </td><td class="rblock">              and Message Parsing", <span class="insert">draft-ietf-httpbis-p1-messaging-07</span></td><td class="lineno" valign="top"></td></tr>
685      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">March</span> 2009.</td><td> </td><td class="rblock">              (work in progress), <span class="insert">July</span> 2009.</td><td class="lineno" valign="top"></td></tr>
686      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
687      <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>
688      <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>
689      <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>
690      <tr><td><a name="diff0046" /></td></tr>
691      <tr><td class="lineno" valign="top"></td><td class="lblock">              Semantics", <span class="delete">draft-ietf-httpbis-p2-semantics-06</span> (work in</td><td> </td><td class="rblock">              Semantics", <span class="insert">draft-ietf-httpbis-p2-semantics-07</span> (work in</td><td class="lineno" valign="top"></td></tr>
692      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">March</span> 2009.</td><td> </td><td class="rblock">              progress), <span class="insert">July</span> 2009.</td><td class="lineno" valign="top"></td></tr>
693      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
694      <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>
695      <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>
696      <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>
697      <tr><td><a name="diff0047" /></td></tr>
698      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Content Negotiation", <span class="delete">draft-ietf-httpbis-p3-payload-06</span></td><td> </td><td class="rblock">              and Content Negotiation", <span class="insert">draft-ietf-httpbis-p3-payload-07</span></td><td class="lineno" valign="top"></td></tr>
699      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">March</span> 2009.</td><td> </td><td class="rblock">              (work in progress), <span class="insert">July</span> 2009.</td><td class="lineno" valign="top"></td></tr>
700      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
701      <tr><td class="lineno" valign="top"></td><td class="left">   [Part4]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part4]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
702      <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>
703      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 4: Conditional</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 4: Conditional</td><td class="lineno" valign="top"></td></tr>
704      <tr><td><a name="diff0048" /></td></tr>
705      <tr><td class="lineno" valign="top"></td><td class="lblock">              Requests", <span class="delete">draft-ietf-httpbis-p4-conditional-06</span> (work in</td><td> </td><td class="rblock">              Requests", <span class="insert">draft-ietf-httpbis-p4-conditional-07</span> (work in</td><td class="lineno" valign="top"></td></tr>
706      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">March</span> 2009.</td><td> </td><td class="rblock">              progress), <span class="insert">July</span> 2009.</td><td class="lineno" valign="top"></td></tr>
707      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
708      <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>
709      <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>
710      <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>
711      <tr><td><a name="diff0049" /></td></tr>
712      <tr><td class="lineno" valign="top"></td><td class="lblock">              Partial Responses", <span class="delete">draft-ietf-httpbis-p5-range-06</span> (work</td><td> </td><td class="rblock">              Partial Responses", <span class="insert">draft-ietf-httpbis-p5-range-07</span> (work</td><td class="lineno" valign="top"></td></tr>
713      <tr><td class="lineno" valign="top"></td><td class="lblock">              in progress), <span class="delete">March</span> 2009.</td><td> </td><td class="rblock">              in progress), <span class="insert">July</span> 2009.</td><td class="lineno" valign="top"></td></tr>
714      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
715      <tr><td class="lineno" valign="top"></td><td class="left">   [Part7]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part7]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
716      <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>
717      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 7: Authentication",</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 7: Authentication",</td><td class="lineno" valign="top"></td></tr>
718      <tr><td><a name="diff0050" /></td></tr>
719      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">draft-ietf-httpbis-p7-auth-06</span> (work in progress),</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p7-auth-07</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
720      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">March</span> 2009.</td><td> </td><td class="rblock">              <span class="insert">July</span> 2009.</td><td class="lineno" valign="top"></td></tr>
721      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
722      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC2047]  Moore, K., "MIME (Multipurpose Internet Mail Extensions)</td><td> </td><td class="right">   [RFC2047]  Moore, K., "MIME (Multipurpose Internet Mail Extensions)</td><td class="lineno" valign="top"></td></tr>
723      <tr><td class="lineno" valign="top"></td><td class="left">              Part Three: Message Header Extensions for Non-ASCII Text",</td><td> </td><td class="right">              Part Three: Message Header Extensions for Non-ASCII Text",</td><td class="lineno" valign="top"></td></tr>
724      <tr><td class="lineno" valign="top"></td><td class="left">              RFC 2047, November 1996.</td><td> </td><td class="right">              RFC 2047, November 1996.</td><td class="lineno" valign="top"></td></tr>
725      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
726      <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>
727      <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>
728      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
729      <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>
730      <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>
731      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
732      <tr bgcolor="gray" ><td></td><th><a name="part-l16" /><small>skipping to change at</small><em> page 31, line 20</em></th><th> </th><th><a name="part-r16" /><small>skipping to change at</small><em> page 31, line 20</em></th><td></td></tr>
733      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
734      <tr><td class="lineno" valign="top"></td><td class="left">A.1.  Changes from RFC 2068</td><td> </td><td class="right">A.1.  Changes from RFC 2068</td><td class="lineno" valign="top"></td></tr>
735      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
736      <tr><td class="lineno" valign="top"></td><td class="left">   A case was missed in the Cache-Control model of HTTP/1.1; s-maxage</td><td> </td><td class="right">   A case was missed in the Cache-Control model of HTTP/1.1; s-maxage</td><td class="lineno" valign="top"></td></tr>
737      <tr><td class="lineno" valign="top"></td><td class="left">   was introduced to add this missing case.  (Sections 2.1, 3.2).</td><td> </td><td class="right">   was introduced to add this missing case.  (Sections 2.1, 3.2).</td><td class="lineno" valign="top"></td></tr>
738      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
739      <tr><td class="lineno"