source: draft-ietf-httpbis/diffs/draft-ietf-httpbis-p6-cache-12-from-11.diff.html @ 1052

Last change on this file since 1052 was 1052, checked in by julian.reschke@…, 9 years ago

prepare publication of -12 drafts on 2010-10-25

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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-11.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p6-cache-12.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                          Alcatel-Lucent</td><td> </td><td class="right">Intended status: Standards Track                          Alcatel-Lucent</td><td class="lineno" valign="top"></td></tr>
44      <tr><td><a name="diff0001" /></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">February 5, 2011</span>                                       J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">April 28, 2011  </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 class="lineno" valign="top"></td><td class="left">                                                      M. Nottingham, Ed.</td><td> </td><td class="right">                                                      M. Nottingham, Ed.</td><td class="lineno" valign="top"></td></tr>
58      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
59      <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>
60      <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>
61      <tr><td><a name="diff0002" /></td></tr>
62      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                        <span class="delete">  August 4</span>, 2010</td><td> </td><td class="rblock">                                                        <span class="insert">October 25</span>, 2010</td><td class="lineno" valign="top"></td></tr>
63      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
64      <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>
65      <tr><td><a name="diff0003" /></td></tr>
66      <tr><td class="lineno" valign="top"></td><td class="lblock">                     draft-ietf-httpbis-p6-cache-1<span class="delete">1</span></td><td> </td><td class="rblock">                     draft-ietf-httpbis-p6-cache-1<span class="insert">2</span></td><td class="lineno" valign="top"></td></tr>
67      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
68      <tr><td class="lineno" valign="top"></td><td class="left">Abstract</td><td> </td><td class="right">Abstract</td><td class="lineno" valign="top"></td></tr>
69      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
70      <tr><td class="lineno" valign="top"></td><td class="left">   The Hypertext Transfer Protocol (HTTP) is an application-level</td><td> </td><td class="right">   The Hypertext Transfer Protocol (HTTP) is an application-level</td><td class="lineno" valign="top"></td></tr>
71      <tr><td class="lineno" valign="top"></td><td class="left">   protocol for distributed, collaborative, hypermedia information</td><td> </td><td class="right">   protocol for distributed, collaborative, hypermedia information</td><td class="lineno" valign="top"></td></tr>
72      <tr><td class="lineno" valign="top"></td><td class="left">   systems.  This document is Part 6 of the seven-part specification</td><td> </td><td class="right">   systems.  This document is Part 6 of the seven-part specification</td><td class="lineno" valign="top"></td></tr>
73      <tr><td class="lineno" valign="top"></td><td class="left">   that defines the protocol referred to as "HTTP/1.1" and, taken</td><td> </td><td class="right">   that defines the protocol referred to as "HTTP/1.1" and, taken</td><td class="lineno" valign="top"></td></tr>
74      <tr><td class="lineno" valign="top"></td><td class="left">   together, obsoletes RFC 2616.  Part 6 defines requirements on HTTP</td><td> </td><td class="right">   together, obsoletes RFC 2616.  Part 6 defines requirements on HTTP</td><td class="lineno" valign="top"></td></tr>
75      <tr><td class="lineno" valign="top"></td><td class="left">   caches and the associated header fields that control cache behavior</td><td> </td><td class="right">   caches and the associated header fields that control cache behavior</td><td class="lineno" valign="top"></td></tr>
76      <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>
77      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
78      <tr><td class="lineno" valign="top"></td><td class="left">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>
79      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
80      <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>
81      <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>
82      <tr><td class="lineno" valign="top"></td><td class="left">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td> </td><td class="right">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td class="lineno" valign="top"></td></tr>
83      <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>
84      <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>
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><a name="diff0004" /></td></tr>
87      <tr><td class="lineno" valign="top"></td><td class="lblock">   The changes in this draft are summarized in Appendix C.1<span class="delete">2</span>.</td><td> </td><td class="rblock">   The changes in this draft are summarized in Appendix C.1<span class="insert">3</span>.</td><td class="lineno" valign="top"></td></tr>
88      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
89      <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>
90      <tr><td class="lineno" valign="top"></td><td class="left">   This Internet-Draft is submitted in full conformance with the</td><td> </td><td class="right">   This Internet-Draft is submitted in full conformance with the</td><td class="lineno" valign="top"></td></tr>
91      <tr><td class="lineno" valign="top"></td><td class="left">   provisions of BCP 78 and BCP 79.</td><td> </td><td class="right">   provisions of BCP 78 and BCP 79.</td><td class="lineno" valign="top"></td></tr>
92      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
93      <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>
94      <tr><td class="lineno" valign="top"></td><td class="left">   Task Force (IETF).  Note that other groups may also distribute</td><td> </td><td class="right">   Task Force (IETF).  Note that other groups may also distribute</td><td class="lineno" valign="top"></td></tr>
95      <tr><td class="lineno" valign="top"></td><td class="left">   working documents as Internet-Drafts.  The list of current Internet-</td><td> </td><td class="right">   working documents as Internet-Drafts.  The list of current Internet-</td><td class="lineno" valign="top"></td></tr>
96      <tr><td class="lineno" valign="top"></td><td class="left">   Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td> </td><td class="right">   Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td class="lineno" valign="top"></td></tr>
97      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
98      <tr><td class="lineno" valign="top"></td><td class="left">   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>
99      <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>
100      <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>
101      <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>
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><a name="diff0005" /></td></tr>
104      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on <span class="delete">February 5</span>, 2011.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">April 28</span>, 2011.</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">Copyright Notice</td><td> </td><td class="right">Copyright Notice</td><td class="lineno" valign="top"></td></tr>
107      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
108      <tr><td class="lineno" valign="top"></td><td class="left">   Copyright (c) 2010 IETF Trust and the persons identified as the</td><td> </td><td class="right">   Copyright (c) 2010 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
109      <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>
110      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
111      <tr><td class="lineno" valign="top"></td><td class="left">   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>
112      <tr><td class="lineno" valign="top"></td><td class="left">   Provisions Relating to IETF Documents</td><td> </td><td class="right">   Provisions Relating to IETF Documents</td><td class="lineno" valign="top"></td></tr>
113      <tr><td class="lineno" valign="top"></td><td class="left">   (http://trustee.ietf.org/license-info) in effect on the date of</td><td> </td><td class="right">   (http://trustee.ietf.org/license-info) in effect on the date of</td><td class="lineno" valign="top"></td></tr>
114      <tr><td class="lineno" valign="top"></td><td class="left">   publication of this document.  Please review these documents</td><td> </td><td class="right">   publication of this document.  Please review these documents</td><td class="lineno" valign="top"></td></tr>
115      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
116      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 3, line 17</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 3, line 17</em></th><td></td></tr>
117      <tr><td class="lineno" valign="top"></td><td class="left">               Specification  . . . . . . . . . . . . . . . . . . . .  7</td><td> </td><td class="right">               Specification  . . . . . . . . . . . . . . . . . . . .  7</td><td class="lineno" valign="top"></td></tr>
118      <tr><td class="lineno" valign="top"></td><td class="left">   2.  Cache Operation  . . . . . . . . . . . . . . . . . . . . . . .  7</td><td> </td><td class="right">   2.  Cache Operation  . . . . . . . . . . . . . . . . . . . . . . .  7</td><td class="lineno" valign="top"></td></tr>
119      <tr><td class="lineno" valign="top"></td><td class="left">     2.1.  Response Cacheability  . . . . . . . . . . . . . . . . . .  7</td><td> </td><td class="right">     2.1.  Response Cacheability  . . . . . . . . . . . . . . . . . .  7</td><td class="lineno" valign="top"></td></tr>
120      <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>
121      <tr><td class="lineno" valign="top"></td><td class="left">     2.2.  Constructing Responses from Caches . . . . . . . . . . . .  9</td><td> </td><td class="right">     2.2.  Constructing Responses from Caches . . . . . . . . . . . .  9</td><td class="lineno" valign="top"></td></tr>
122      <tr><td class="lineno" valign="top"></td><td class="left">     2.3.  Freshness Model  . . . . . . . . . . . . . . . . . . . . . 10</td><td> </td><td class="right">     2.3.  Freshness Model  . . . . . . . . . . . . . . . . . . . . . 10</td><td class="lineno" valign="top"></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.1.  Calculating Freshness Lifetime . . . . . . . . . . . . 11</td><td> </td><td class="right">       2.3.1.  Calculating Freshness Lifetime . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
124      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.2.  Calculating Age  . . . . . . . . . . . . . . . . . . . 12</td><td> </td><td class="right">       2.3.2.  Calculating Age  . . . . . . . . . . . . . . . . . . . 12</td><td class="lineno" valign="top"></td></tr>
125      <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>
126      <tr><td class="lineno" valign="top"></td><td class="left">     2.4.  Validation Model . . . . . . . . . . . . . . . . . . . . . 14</td><td> </td><td class="right">     2.4.  Validation Model . . . . . . . . . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
127      <tr><td><a name="diff0006" /></td></tr>
128      <tr><td class="lineno" valign="top"></td><td class="lblock">     2.5.  Request Methods that Invalidate  . . . . . . . . . . . . . 1<span class="delete">4</span></td><td> </td><td class="rblock">     2.5.  Request Methods that Invalidate  . . . . . . . . . . . . . 1<span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
129      <tr><td class="lineno" valign="top"></td><td class="left">     2.6.  Shared Caching of Authenticated Responses  . . . . . . . . 15</td><td> </td><td class="right">     2.6.  Shared Caching of Authenticated Responses  . . . . . . . . 15</td><td class="lineno" valign="top"></td></tr>
130      <tr><td class="lineno" valign="top"></td><td class="left">     2.7.  Caching Negotiated Responses . . . . . . . . . . . . . . . 16</td><td> </td><td class="right">     2.7.  Caching Negotiated Responses . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
131      <tr><td><a name="diff0007" /></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="lblock">     2.8.  Combining Responses  . . . . . . . . . . . . . . . . . . . 1<span class="delete">6</span></td><td> </td><td class="rblock">     2.8.  Combining Responses  . . . . . . . . . . . . . . . . . . . 1<span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="left">   3.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">   3.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
134      <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>
135      <tr><td class="lineno" valign="top"></td><td class="left">     3.2.  Cache-Control  . . . . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right">     3.2.  Cache-Control  . . . . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
136      <tr><td><a name="diff0008" /></td></tr>
137      <tr><td class="lineno" valign="top"></td><td class="lblock">       3.2.1.  Request Cache-Control Directives . . . . . . . . . . . 1<span class="delete">8</span></td><td> </td><td class="rblock">       3.2.1.  Request Cache-Control Directives . . . . . . . . . . . 1<span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
138      <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>
139      <tr><td><a name="diff0009" /></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="lblock">       3.2.3.  Cache Control Extensions . . . . . . . . . . . . . . . 2<span class="delete">2</span></td><td> </td><td class="rblock">       3.2.3.  Cache Control Extensions . . . . . . . . . . . . . . . 2<span class="insert">3</span></td><td class="lineno" valign="top"></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="left">     3.3.  Expires  . . . . . . . . . . . . . . . . . . . . . . . . . 24</td><td> </td><td class="right">     3.3.  Expires  . . . . . . . . . . . . . . . . . . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
142      <tr><td><a name="diff0010" /></td></tr>
143      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.4.  Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 2<span class="delete">4</span></td><td> </td><td class="rblock">     3.4.  Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 2<span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="left">     3.5.  Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td> </td><td class="right">     3.5.  Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td class="lineno" valign="top"></td></tr>
145      <tr><td class="lineno" valign="top"></td><td class="left">     3.6.  Warning  . . . . . . . . . . . . . . . . . . . . . . . . . 26</td><td> </td><td class="right">     3.6.  Warning  . . . . . . . . . . . . . . . . . . . . . . . . . 26</td><td class="lineno" valign="top"></td></tr>
146      <tr><td><a name="diff0011" /></td></tr>
147      <tr><td class="lineno" valign="top"></td><td class="lblock">   4.  History Lists  . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">28</span></td><td> </td><td class="rblock">   4.  History Lists  . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">29</span></td><td class="lineno" valign="top"></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="lblock">   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . <span class="delete">28</span></td><td> </td><td class="rblock">   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . <span class="insert">29</span></td><td class="lineno" valign="top"></td></tr>
149      <tr><td class="lineno" valign="top"></td><td class="lblock">     5.1.  Cache Directive Registry . . . . . . . . . . . . . . . . . <span class="delete">28</span></td><td> </td><td class="rblock">     5.1.  Cache Directive Registry . . . . . . . . . . . . . . . . . <span class="insert">29</span></td><td class="lineno" valign="top"></td></tr>
150      <tr><td class="lineno" valign="top"></td><td class="lblock">     5.2.  Header Field Registration  . . . . . . . . . . . . . . . . <span class="delete">29</span></td><td> </td><td class="rblock">     5.2.  Header Field Registration  . . . . . . . . . . . . . . . . <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
151      <tr><td class="lineno" valign="top"></td><td class="lblock">   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . <span class="delete">29</span></td><td> </td><td class="rblock">   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
152      <tr><td class="lineno" valign="top"></td><td class="left">   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right">   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
153      <tr><td class="lineno" valign="top"></td><td class="left">   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right">   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
154      <tr><td class="lineno" valign="top"></td><td class="left">     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right">     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="left">     8.2.  Informative References . . . . . . . . . . . . . . . . . . 31</td><td> </td><td class="right">     8.2.  Informative References . . . . . . . . . . . . . . . . . . 31</td><td class="lineno" valign="top"></td></tr>
156      <tr><td><a name="diff0012" /></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="delete">31</span></td><td> </td><td class="rblock">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="insert">32</span></td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . <span class="delete">31</span></td><td> </td><td class="rblock">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . <span class="insert">32</span></td><td class="lineno" valign="top"></td></tr>
159      <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>
160      <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>
161      <tr><td><a name="diff0013" /></td></tr>
162      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.1.  Since <span class="delete">RFC2616</span>  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">33</span></td><td> </td><td class="rblock">     C.1.  Since <span class="insert">RFC 2616</span> . . . . . . . . . . . . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.2.  Since draft-ietf-httpbis-p6-cache-00 . . . . . . . . . . . <span class="delete">33</span></td><td> </td><td class="rblock">     C.2.  Since draft-ietf-httpbis-p6-cache-00 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
164      <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>
165      <tr><td><a name="diff0014" /></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.4.  Since draft-ietf-httpbis-p6-cache-02 . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock">     C.4.  Since draft-ietf-httpbis-p6-cache-02 . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.5.  Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock">     C.5.  Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
168      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.6.  Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock">     C.6.  Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . <span class="insert">35</span></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="diff0015" /></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.8.  Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock">     C.8.  Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . <span class="insert">36</span></td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.9.  Since draft-ietf-httpbis-p6-cache-07 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock">     C.9.  Since draft-ietf-httpbis-p6-cache-07 . . . . . . . . . . . <span class="insert">36</span></td><td class="lineno" valign="top"></td></tr>
173      <tr><td class="lineno" valign="top"></td><td class="left">     C.10. Since draft-ietf-httpbis-p6-cache-08 . . . . . . . . . . . 36</td><td> </td><td class="right">     C.10. Since draft-ietf-httpbis-p6-cache-08 . . . . . . . . . . . 36</td><td class="lineno" valign="top"></td></tr>
174      <tr><td><a name="diff0016" /></td></tr>
175      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.11. Since draft-ietf-httpbis-p6-cache-09 . . . . . . . . . . . 3<span class="delete">6</span></td><td> </td><td class="rblock">     C.11. Since draft-ietf-httpbis-p6-cache-09 . . . . . . . . . . . 3<span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
176      <tr><td class="lineno" valign="top"></td><td class="left">     C.12. Since draft-ietf-httpbis-p6-cache-10 . . . . . . . . . . . 37</td><td> </td><td class="right">     C.12. Since draft-ietf-httpbis-p6-cache-10 . . . . . . . . . . . 37</td><td class="lineno" valign="top"></td></tr>
177      <tr><td><a name="diff0017" /></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="lblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">37</span></td><td> </td><td class="rblock">     <span class="insert">C.13. Since draft-ietf-httpbis-p6-cache-11 . . . . . . . . . . . 38</span></td><td class="lineno" valign="top"></td></tr>
179      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">38</span></td><td class="lineno" valign="top"></td></tr>
180      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
181      <tr><td class="lineno" valign="top"></td><td class="left">1.  Introduction</td><td> </td><td class="right">1.  Introduction</td><td class="lineno" valign="top"></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
183      <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>
184      <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>
185      <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>
186      <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>
187      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
188      <tr><td 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>
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"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
191      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 8, line 8</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 8, line 8</em></th><td></td></tr>
192      <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>
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">   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>
195      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
196      <tr><td class="lineno" valign="top"></td><td class="left">   o  The request method is understood by the cache and defined as being</td><td> </td><td class="right">   o  The request method is understood by the cache and defined as being</td><td class="lineno" valign="top"></td></tr>
197      <tr><td class="lineno" valign="top"></td><td class="left">      cacheable, and</td><td> </td><td class="right">      cacheable, and</td><td class="lineno" valign="top"></td></tr>
198      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
199      <tr><td class="lineno" valign="top"></td><td class="left">   o  the response status code is understood by the cache, and</td><td> </td><td class="right">   o  the response status code is understood by the cache, and</td><td class="lineno" valign="top"></td></tr>
200      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
201      <tr><td class="lineno" valign="top"></td><td class="left">   o  the "no-store" cache directive (see Section 3.2) does not appear</td><td> </td><td class="right">   o  the "no-store" cache directive (see Section 3.2) does not appear</td><td class="lineno" valign="top"></td></tr>
202      <tr><td><a name="diff0018" /></td></tr>
203      <tr><td class="lineno" valign="top"></td><td class="lblock">      in request or response headers, and</td><td> </td><td class="rblock">      in request or response header<span class="insert"> field</span>s, and</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">   o  the "private" cache response directive (see Section 3.2.2 does not</td><td> </td><td class="right">   o  the "private" cache response directive (see Section 3.2.2 does not</td><td class="lineno" valign="top"></td></tr>
206      <tr><td class="lineno" valign="top"></td><td class="left">      appear in the response, if the cache is shared, and</td><td> </td><td class="right">      appear in the response, if the cache is shared, and</td><td class="lineno" valign="top"></td></tr>
207      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
208      <tr><td><a name="diff0019" /></td></tr>
209      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  the "Authorization" header (see Section <span class="delete">3.1</span> of [Part7]) does not</td><td> </td><td class="rblock">   o  the "Authorization" header <span class="insert">field</span> (see Section <span class="insert">4.1</span> of [Part7]) does</td><td class="lineno" valign="top"></td></tr>
210      <tr><td class="lineno" valign="top"></td><td class="lblock">      appear in the request, if the cache is shared, unless the response</td><td> </td><td class="rblock">      not appear in the request, if the cache is shared, unless the</td><td class="lineno" valign="top"></td></tr>
211      <tr><td class="lineno" valign="top"></td><td class="lblock">      explicitly allows it (see Section 2.6), and</td><td> </td><td class="rblock">      response explicitly allows it (see Section 2.6), and</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">   o  the response either:</td><td> </td><td class="right">   o  the response either:</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><a name="diff0020" /></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="lblock">      *  contains an Expires header (see Section 3.3), or</td><td> </td><td class="rblock">      *  contains an Expires header <span class="insert">field </span>(see Section 3.3), or</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">      *  contains a max-age response cache directive (see</td><td> </td><td class="right">      *  contains a max-age response cache directive (see</td><td class="lineno" valign="top"></td></tr>
219      <tr><td class="lineno" valign="top"></td><td class="left">         Section 3.2.2), or</td><td> </td><td class="right">         Section 3.2.2), or</td><td class="lineno" valign="top"></td></tr>
220      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
221      <tr><td class="lineno" valign="top"></td><td class="left">      *  contains a s-maxage response cache directive and the cache is</td><td> </td><td class="right">      *  contains a s-maxage response cache directive and the cache is</td><td class="lineno" valign="top"></td></tr>
222      <tr><td class="lineno" valign="top"></td><td class="left">         shared, or</td><td> </td><td class="right">         shared, or</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">      *  contains a Cache Control Extension (see Section 3.2.3) that</td><td> </td><td class="right">      *  contains a Cache Control Extension (see Section 3.2.3) that</td><td class="lineno" valign="top"></td></tr>
225      <tr><td class="lineno" valign="top"></td><td class="left">         allows it to be cached, or</td><td> </td><td class="right">         allows it to be cached, or</td><td class="lineno" valign="top"></td></tr>
226      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
227      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
228      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 8, line 47</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 8, line 47</em></th><td></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="left">   content (see Section 2.1.1).</td><td> </td><td class="right">   content (see Section 2.1.1).</td><td class="lineno" valign="top"></td></tr>
230      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
231      <tr><td class="lineno" valign="top"></td><td class="left">   Note that in normal operation, most caches will not store a response</td><td> </td><td class="right">   Note that in normal operation, most caches will not store a response</td><td class="lineno" valign="top"></td></tr>
232      <tr><td class="lineno" valign="top"></td><td class="left">   that has neither a cache validator nor an explicit expiration time,</td><td> </td><td class="right">   that has neither a cache validator nor an explicit expiration time,</td><td class="lineno" valign="top"></td></tr>
233      <tr><td class="lineno" valign="top"></td><td class="left">   as such responses are not usually useful to store.  However, caches</td><td> </td><td class="right">   as such responses are not usually useful to store.  However, caches</td><td class="lineno" valign="top"></td></tr>
234      <tr><td class="lineno" valign="top"></td><td class="left">   are not prohibited from storing such responses.</td><td> </td><td class="right">   are not prohibited from storing such responses.</td><td class="lineno" valign="top"></td></tr>
235      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="left">2.1.1.  Storing Partial and Incomplete Responses</td><td> </td><td class="right">2.1.1.  Storing Partial and Incomplete Responses</td><td class="lineno" valign="top"></td></tr>
237      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
238      <tr><td class="lineno" valign="top"></td><td class="left">   A cache that receives an incomplete response (for example, with fewer</td><td> </td><td class="right">   A cache that receives an incomplete response (for example, with fewer</td><td class="lineno" valign="top"></td></tr>
239      <tr><td><a name="diff0021" /></td></tr>
240      <tr><td class="lineno" valign="top"></td><td class="lblock">   bytes of data than specified in a Content-Length <span class="delete">header)</span> can store</td><td> </td><td class="rblock">   bytes of data than specified in a Content-Length <span class="insert">header field)</span> can</td><td class="lineno" valign="top"></td></tr>
241      <tr><td class="lineno" valign="top"></td><td class="lblock">   the response, but MUST treat it as a partial response [Part5].</td><td> </td><td class="rblock">   store the response, but MUST treat it as a partial response [Part5].</td><td class="lineno" valign="top"></td></tr>
242      <tr><td class="lineno" valign="top"></td><td class="left">   Partial responses can be combined as described in Section 4 of</td><td> </td><td class="right">   Partial responses can be combined as described in Section 4 of</td><td class="lineno" valign="top"></td></tr>
243      <tr><td class="lineno" valign="top"></td><td class="left">   [Part5]; the result might be a full response or might still be</td><td> </td><td class="right">   [Part5]; the result might be a full response or might still be</td><td class="lineno" valign="top"></td></tr>
244      <tr><td class="lineno" valign="top"></td><td class="left">   partial.  A cache MUST NOT return a partial response to a client</td><td> </td><td class="right">   partial.  A cache MUST NOT return a partial response to a client</td><td class="lineno" valign="top"></td></tr>
245      <tr><td class="lineno" valign="top"></td><td class="left">   without explicitly marking it as such using the 206 (Partial Content)</td><td> </td><td class="right">   without explicitly marking it as such using the 206 (Partial Content)</td><td class="lineno" valign="top"></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="left">   status code.</td><td> </td><td class="right">   status code.</td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
248      <tr><td><a name="diff0022" /></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="lblock">   A cache that does not support the Range and Content-Range <span class="delete">headers</span></td><td> </td><td class="rblock">   A cache that does not support the Range and Content-Range <span class="insert">header</span></td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="lblock">   MUST NOT store incomplete or partial responses.</td><td> </td><td class="rblock"><span class="insert">   fields</span> MUST NOT store incomplete or partial responses.</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">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>
253      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
254      <tr><td class="lineno" valign="top"></td><td class="left">   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>
255      <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>
256      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
257      <tr><td class="lineno" valign="top"></td><td class="left">   o  The presented effective request URI (Section 4.3 of [Part1]) and</td><td> </td><td class="right">   o  The presented effective request URI (Section 4.3 of [Part1]) and</td><td class="lineno" valign="top"></td></tr>
258      <tr><td class="lineno" valign="top"></td><td class="left">      that of the stored response match, and</td><td> </td><td class="right">      that of the stored response match, and</td><td class="lineno" valign="top"></td></tr>
259      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
260      <tr><td class="lineno" valign="top"></td><td class="left">   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>
261      <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>
262      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
263      <tr><td><a name="diff0023" /></td></tr>
264      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  selecting <span class="delete">request-headers</span> nominated by the stored response (if</td><td> </td><td class="rblock">   o  selecting <span class="insert">request-header fields</span> nominated by the stored response</td><td class="lineno" valign="top"></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="lblock">      any) match those presented (see Section 2.7), and</td><td> </td><td class="rblock">      (if any) match those presented (see Section 2.7), and</td><td class="lineno" valign="top"></td></tr>
266      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
267      <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>
268      <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>
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">   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>
271      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
272      <tr><td 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>
273      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
274      <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>
275      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
276      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
277      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 9, line 48</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 9, line 48</em></th><td></td></tr>
278      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
279      <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>
280      <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>
281      <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>
282      <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>
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">   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>
285      <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>
286      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="left">   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>
288      <tr><td><a name="diff0024" /></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">header)</span> when more than one suitable response is stored.  They can</td><td> </td><td class="rblock">   <span class="insert">header field)</span> when more than one suitable response is stored.  They</td><td class="lineno" valign="top"></td></tr>
290      <tr><td class="lineno" valign="top"></td><td class="lblock">   also forward a request with "Cache-Control: max-age=0" or "Cache-</td><td> </td><td class="rblock">   can also forward a request with "Cache-Control: max-age=0" or "Cache-</td><td class="lineno" valign="top"></td></tr>
291      <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>
292      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
293      <tr><td><a name="diff0025" /></td></tr>
294      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">An HTTP implementation without a clock MUST NOT used stored responses</span></td><td class="lineno" valign="top"></td></tr>
295      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   without revalidating them on every use.  An HTTP cache, especially a</span></td><td class="lineno" valign="top"></td></tr>
296      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   shared cache, SHOULD use a mechanism, such as NTP [RFC1305], to</span></td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   synchronize its clock with a reliable external standard.</span></td><td class="lineno" valign="top"></td></tr>
298      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
299      <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>
300      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
301      <tr><td class="lineno" valign="top"></td><td class="left">   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>
302      <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>
303      <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>
304      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
305      <tr><td class="lineno" valign="top"></td><td class="left">   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>
306      <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>
307      <tr><td><a name="diff0026" /></td></tr>
308      <tr><td class="lineno" valign="top"></td><td class="lblock">   either the Expires header (Section 3.3) or the max-age response cache</td><td> </td><td class="rblock">   either the Expires header <span class="insert">field</span> (Section 3.3) or the max-age response</td><td class="lineno" valign="top"></td></tr>
309      <tr><td class="lineno" valign="top"></td><td class="lblock">   directive (Section 3.2.2).  Generally, origin servers will assign</td><td> </td><td class="rblock">   cache directive (Section 3.2.2).  Generally, origin servers will</td><td class="lineno" valign="top"></td></tr>
310      <tr><td class="lineno" valign="top"></td><td class="lblock">   future explicit expiration times to responses in the belief that the</td><td> </td><td class="rblock">   assign future explicit expiration times to responses in the belief</td><td class="lineno" valign="top"></td></tr>
311      <tr><td class="lineno" valign="top"></td><td class="lblock">   representation is not likely to change in a semantically significant</td><td> </td><td class="rblock">   that the representation is not likely to change in a semantically</td><td class="lineno" valign="top"></td></tr>
312      <tr><td class="lineno" valign="top"></td><td class="lblock">   way before the expiration time is reached.</td><td> </td><td class="rblock">   significant way before the expiration time is reached.</td><td class="lineno" valign="top"></td></tr>
313      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
314      <tr><td class="lineno" 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>
315      <tr><td class="lineno" valign="top"></td><td class="left">   request, it can assign an explicit expiration time in the past to</td><td> </td><td class="right">   request, it can assign an explicit expiration time in the past to</td><td class="lineno" valign="top"></td></tr>
316      <tr><td class="lineno" valign="top"></td><td class="left">   indicate that the response is already stale.  Compliant caches will</td><td> </td><td class="right">   indicate that the response is already stale.  Compliant caches will</td><td class="lineno" valign="top"></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="left">   validate the cached response before reusing it for subsequent</td><td> </td><td class="right">   validate the cached response before reusing it for subsequent</td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="left">   requests.</td><td> </td><td class="right">   requests.</td><td class="lineno" valign="top"></td></tr>
319      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
320      <tr><td 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>
321      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP caches MAY assign heuristic expiration times when explicit times</td><td> </td><td class="right">   HTTP caches MAY assign heuristic expiration times when explicit times</td><td class="lineno" valign="top"></td></tr>
322      <tr><td><a name="diff0027" /></td></tr>
323      <tr><td class="lineno" valign="top"></td><td class="lblock">   are not specified, employing algorithms that use other <span class="delete">header</span> values</td><td> </td><td class="rblock">   are not specified, employing algorithms that use other <span class="insert">heade field</span></td><td class="lineno" valign="top"></td></tr>
324      <tr><td class="lineno" valign="top"></td><td class="lblock">   (such as the Last-Modified time) to estimate a plausible expiration</td><td> </td><td class="rblock">   values (such as the Last-Modified time) to estimate a plausible</td><td class="lineno" valign="top"></td></tr>
325      <tr><td class="lineno" valign="top"></td><td class="lblock">   time.  The HTTP/1.1 specification does not provide specific</td><td> </td><td class="rblock">   expiration time.  The HTTP/1.1 specification does not provide</td><td class="lineno" valign="top"></td></tr>
326      <tr><td class="lineno" valign="top"></td><td class="lblock">   algorithms, but does impose worst-case constraints on their results.</td><td> </td><td class="rblock">   specific algorithms, but does impose worst-case constraints on their</td><td class="lineno" valign="top"></td></tr>
327      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   results.</td><td class="lineno" valign="top"></td></tr>
328      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
329      <tr><td class="lineno" valign="top"></td><td class="left">   The calculation to determine if a response is fresh is:</td><td> </td><td class="right">   The calculation to determine if a response is fresh is:</td><td class="lineno" valign="top"></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
331      <tr><td class="lineno" valign="top"></td><td class="left">      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>
332      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
333      <tr><td class="lineno" valign="top"></td><td class="left">   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>
334      <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>
335      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
336      <tr><td class="lineno" valign="top"></td><td class="left">   Additionally, clients might need to influence freshness calculation.</td><td> </td><td class="right">   Additionally, clients might need to influence freshness calculation.</td><td class="lineno" valign="top"></td></tr>
337      <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>
338      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
339      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 11, line 16</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 11, line 20</em></th><td></td></tr>
340      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
341      <tr><td class="lineno" valign="top"></td><td class="left">   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>
342      <tr><td class="lineno" valign="top"></td><td class="left">   freshness_lifetime) of a response by using the first match of:</td><td> </td><td class="right">   freshness_lifetime) of a response by using the first match of:</td><td class="lineno" valign="top"></td></tr>
343      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
344      <tr><td class="lineno" valign="top"></td><td class="left">   o  If the cache is shared and the s-maxage response cache directive</td><td> </td><td class="right">   o  If the cache is shared and the s-maxage response cache directive</td><td class="lineno" valign="top"></td></tr>
345      <tr><td class="lineno" valign="top"></td><td class="left">      (Section 3.2.2) is present, use its value, or</td><td> </td><td class="right">      (Section 3.2.2) is present, use its value, or</td><td class="lineno" valign="top"></td></tr>
346      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
347      <tr><td class="lineno" valign="top"></td><td class="left">   o  If the max-age response cache directive (Section 3.2.2) is</td><td> </td><td class="right">   o  If the max-age response cache directive (Section 3.2.2) is</td><td class="lineno" valign="top"></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="left">      present, use its value, or</td><td> </td><td class="right">      present, use its value, or</td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
350      <tr><td><a name="diff0028" /></td></tr>
351      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  If the Expires response header (Section 3.3) is present, use its</td><td> </td><td class="rblock">   o  If the Expires response header <span class="insert">field</span> (Section 3.3) is present, use</td><td class="lineno" valign="top"></td></tr>
352      <tr><td class="lineno" valign="top"></td><td class="lblock">      value minus the value of the Date response <span class="delete">header,</span> or</td><td> </td><td class="rblock">      its value minus the value of the Date response <span class="insert">header field,</span> or</td><td class="lineno" valign="top"></td></tr>
353      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
354      <tr><td class="lineno" valign="top"></td><td class="left">   o  Otherwise, no explicit expiration time is present in the response.</td><td> </td><td class="right">   o  Otherwise, no explicit expiration time is present in the response.</td><td class="lineno" valign="top"></td></tr>
355      <tr><td class="lineno" valign="top"></td><td class="left">      A heuristic freshness lifetime might be applicable; see</td><td> </td><td class="right">      A heuristic freshness lifetime might be applicable; see</td><td class="lineno" valign="top"></td></tr>
356      <tr><td class="lineno" valign="top"></td><td class="left">      Section 2.3.1.1.</td><td> </td><td class="right">      Section 2.3.1.1.</td><td class="lineno" valign="top"></td></tr>
357      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
358      <tr><td class="lineno" valign="top"></td><td class="left">   Note that this calculation is not vulnerable to clock skew, since all</td><td> </td><td class="right">   Note that this calculation is not vulnerable to clock skew, since all</td><td class="lineno" valign="top"></td></tr>
359      <tr><td class="lineno" valign="top"></td><td class="left">   of the information comes from the origin server.</td><td> </td><td class="right">   of the information comes from the origin server.</td><td class="lineno" valign="top"></td></tr>
360      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
361      <tr><td class="lineno" valign="top"></td><td class="left">2.3.1.1.  Calculating Heuristic Freshness</td><td> </td><td class="right">2.3.1.1.  Calculating Heuristic Freshness</td><td class="lineno" valign="top"></td></tr>
362      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
363      <tr><td class="lineno" valign="top"></td><td class="left">   If no explicit expiration time is present in a stored response that</td><td> </td><td class="right">   If no explicit expiration time is present in a stored response that</td><td class="lineno" valign="top"></td></tr>
364      <tr><td class="lineno" valign="top"></td><td class="left">   has a status code whose definition allows heuristic freshness to be</td><td> </td><td class="right">   has a status code whose definition allows heuristic freshness to be</td><td class="lineno" valign="top"></td></tr>
365      <tr><td class="lineno" valign="top"></td><td class="left">   used (including the following in Section 8 of [Part2]: 200, 203, 206,</td><td> </td><td class="right">   used (including the following in Section 8 of [Part2]: 200, 203, 206,</td><td class="lineno" valign="top"></td></tr>
366      <tr><td class="lineno" valign="top"></td><td class="left">   300, 301 and 410), a heuristic expiration time MAY be calculated.</td><td> </td><td class="right">   300, 301 and 410), a heuristic expiration time MAY be calculated.</td><td class="lineno" valign="top"></td></tr>
367      <tr><td class="lineno" valign="top"></td><td class="left">   Heuristics MUST NOT be used for response status codes that do not</td><td> </td><td class="right">   Heuristics MUST NOT be used for response status codes that do not</td><td class="lineno" valign="top"></td></tr>
368      <tr><td class="lineno" valign="top"></td><td class="left">   explicitly allow it.</td><td> </td><td class="right">   explicitly allow it.</td><td class="lineno" valign="top"></td></tr>
369      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
370      <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>
371      <tr><td><a name="diff0029" /></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="lblock">   SHOULD attach a Warning header with a 113 warn-code to the response</td><td> </td><td class="rblock">   SHOULD attach a Warning header <span class="insert">field</span> with a 113 warn-code to the</td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="lblock">   if its current_age is more than 24 hours and such a warning is not</td><td> </td><td class="rblock">   response if its current_age is more than 24 hours and such a warning</td><td class="lineno" valign="top"></td></tr>
374      <tr><td class="lineno" valign="top"></td><td class="lblock">   already present.</td><td> </td><td class="rblock">   is not already present.</td><td class="lineno" valign="top"></td></tr>
375      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
376      <tr><td><a name="diff0030" /></td></tr>
377      <tr><td class="lineno" valign="top"></td><td class="lblock">   Also, if the response has a Last-Modified header (Section 6.6 of</td><td> </td><td class="rblock">   Also, if the response has a Last-Modified header <span class="insert">field</span> (Section 6.6</td><td class="lineno" valign="top"></td></tr>
378      <tr><td class="lineno" valign="top"></td><td class="lblock">   [Part4]), the heuristic expiration value SHOULD be no more than some</td><td> </td><td class="rblock">   of [Part4]), the heuristic expiration value SHOULD be no more than</td><td class="lineno" valign="top"></td></tr>
379      <tr><td class="lineno" valign="top"></td><td class="lblock">   fraction of the interval since that time.  A typical setting of this</td><td> </td><td class="rblock">   some fraction of the interval since that time.  A typical setting of</td><td class="lineno" valign="top"></td></tr>
380      <tr><td class="lineno" valign="top"></td><td class="lblock">   fraction might be 10%.</td><td> </td><td class="rblock">   this fraction might be 10%.</td><td class="lineno" valign="top"></td></tr>
381      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
382      <tr><td class="lineno" valign="top"></td><td class="left">      Note: RFC 2616 ([RFC2616], Section 13.9) required that caches do</td><td> </td><td class="right">      Note: RFC 2616 ([RFC2616], Section 13.9) required that caches do</td><td class="lineno" valign="top"></td></tr>
383      <tr><td class="lineno" valign="top"></td><td class="left">      not calculate heuristic freshness for URLs with query components</td><td> </td><td class="right">      not calculate heuristic freshness for URLs with query components</td><td class="lineno" valign="top"></td></tr>
384      <tr><td class="lineno" valign="top"></td><td class="left">      (i.e., those containing '?').  In practice, this has not been</td><td> </td><td class="right">      (i.e., those containing '?').  In practice, this has not been</td><td class="lineno" valign="top"></td></tr>
385      <tr><td class="lineno" valign="top"></td><td class="left">      widely implemented.  Therefore, servers are encouraged to send</td><td> </td><td class="right">      widely implemented.  Therefore, servers are encouraged to send</td><td class="lineno" valign="top"></td></tr>
386      <tr><td class="lineno" valign="top"></td><td class="left">      explicit directives (e.g., Cache-Control: no-cache) if they wish</td><td> </td><td class="right">      explicit directives (e.g., Cache-Control: no-cache) if they wish</td><td class="lineno" valign="top"></td></tr>
387      <tr><td class="lineno" valign="top"></td><td class="left">      to preclude caching.</td><td> </td><td class="right">      to preclude caching.</td><td class="lineno" valign="top"></td></tr>
388      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
389      <tr><td class="lineno" valign="top"></td><td class="left">2.3.2.  Calculating Age</td><td> </td><td class="right">2.3.2.  Calculating Age</td><td class="lineno" valign="top"></td></tr>
390      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
391      <tr><td><a name="diff0031" /></td></tr>
392      <tr><td class="lineno" valign="top"></td><td class="lblock">   HTTP/1.1 uses the Age response-header to convey the estimated age of</td><td> </td><td class="rblock">   HTTP/1.1 uses the Age response-header <span class="insert">field</span> to convey the estimated</td><td class="lineno" valign="top"></td></tr>
393      <tr><td class="lineno" valign="top"></td><td class="lblock">   the response message when obtained from a cache.  The Age field value</td><td> </td><td class="rblock">   age of the response message when obtained from a cache.  The Age</td><td class="lineno" valign="top"></td></tr>
394      <tr><td class="lineno" valign="top"></td><td class="lblock">   is the cache's estimate of the amount of time since the response was</td><td> </td><td class="rblock">   field value is the cache's estimate of the amount of time since the</td><td class="lineno" valign="top"></td></tr>
395      <tr><td class="lineno" valign="top"></td><td class="lblock">   generated or validated by the origin server.  In essence, the Age</td><td> </td><td class="rblock">   response was generated or validated by the origin server.  In</td><td class="lineno" valign="top"></td></tr>
396      <tr><td class="lineno" valign="top"></td><td class="lblock">   value is the sum of the time that the response has been resident in</td><td> </td><td class="rblock">   essence, the Age value is the sum of the time that the response has</td><td class="lineno" valign="top"></td></tr>
397      <tr><td class="lineno" valign="top"></td><td class="lblock">   each of the caches along the path from the origin server, plus the</td><td> </td><td class="rblock">   been resident in each of the caches along the path from the origin</td><td class="lineno" valign="top"></td></tr>
398      <tr><td class="lineno" valign="top"></td><td class="lblock">   amount of time it has been in transit along network paths.</td><td> </td><td class="rblock">   server, plus the amount of time it has been in transit along network</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">   paths.</td><td class="lineno" valign="top"></td></tr>
400      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
401      <tr><td class="lineno" valign="top"></td><td class="left">   The following data is used for the age calculation:</td><td> </td><td class="right">   The following data is used for the age calculation:</td><td class="lineno" valign="top"></td></tr>
402      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
403      <tr><td class="lineno" valign="top"></td><td class="left">   age_value</td><td> </td><td class="right">   age_value</td><td class="lineno" valign="top"></td></tr>
404      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
405      <tr><td><a name="diff0032" /></td></tr>
406      <tr><td class="lineno" valign="top"></td><td class="lblock">      The term "age_value" denotes the value of the Age header</td><td> </td><td class="rblock">      The term "age_value" denotes the value of the Age header<span class="insert"> field</span></td><td class="lineno" valign="top"></td></tr>
407      <tr><td class="lineno" valign="top"></td><td class="left">      (Section 3.1), in a form appropriate for arithmetic operation; or</td><td> </td><td class="right">      (Section 3.1), in a form appropriate for arithmetic operation; or</td><td class="lineno" valign="top"></td></tr>
408      <tr><td class="lineno" valign="top"></td><td class="left">      0, if not available.</td><td> </td><td class="right">      0, if not available.</td><td class="lineno" valign="top"></td></tr>
409      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
410      <tr><td class="lineno" valign="top"></td><td class="left">   date_value</td><td> </td><td class="right">   date_value</td><td class="lineno" valign="top"></td></tr>
411      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
412      <tr><td><a name="diff0033" /></td></tr>
413      <tr><td class="lineno" valign="top"></td><td class="lblock">      HTTP/1.1 requires origin servers to send a Date header, if</td><td> </td><td class="rblock">      HTTP/1.1 requires origin servers to send a Date header<span class="insert"> field</span>, if</td><td class="lineno" valign="top"></td></tr>
414      <tr><td class="lineno" valign="top"></td><td class="left">      possible, with every response, giving the time at which the</td><td> </td><td class="right">      possible, with every response, giving the time at which the</td><td class="lineno" valign="top"></td></tr>
415      <tr><td class="lineno" valign="top"></td><td class="left">      response was generated.  The term "date_value" denotes the value</td><td> </td><td class="right">      response was generated.  The term "date_value" denotes the value</td><td class="lineno" valign="top"></td></tr>
416      <tr><td><a name="diff0034" /></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="lblock">      of the Date header, in a form appropriate for arithmetic</td><td> </td><td class="rblock">      of the Date header<span class="insert"> field</span>, in a form appropriate for arithmetic</td><td class="lineno" valign="top"></td></tr>
418      <tr><td class="lineno" valign="top"></td><td class="left">      operations.  See Section 9.3 of [Part1] for the definition of the</td><td> </td><td class="right">      operations.  See Section 9.3 of [Part1] for the definition of the</td><td class="lineno" valign="top"></td></tr>
419      <tr><td><a name="diff0035" /></td></tr>
420      <tr><td class="lineno" valign="top"></td><td class="lblock">      Date <span class="delete">header,</span> and for requirements regarding responses without <span class="delete">a</span></td><td> </td><td class="rblock">      Date <span class="insert">header field,</span> and for requirements regarding responses</td><td class="lineno" valign="top"></td></tr>
421      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">      Date response header.</span></td><td> </td><td class="rblock">      without <span class="insert">it.</span></td><td class="lineno" valign="top"></td></tr>
422      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
423      <tr><td class="lineno" valign="top"></td><td class="left">   now</td><td> </td><td class="right">   now</td><td class="lineno" valign="top"></td></tr>
424      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
425      <tr><td class="lineno" valign="top"></td><td class="left">      The term "now" means "the current value of the clock at the host</td><td> </td><td class="right">      The term "now" means "the current value of the clock at the host</td><td class="lineno" valign="top"></td></tr>
426      <tr><td class="lineno" valign="top"></td><td class="left">      performing the calculation".  Hosts that use HTTP, but especially</td><td> </td><td class="right">      performing the calculation".  Hosts that use HTTP, but especially</td><td class="lineno" valign="top"></td></tr>
427      <tr><td class="lineno" valign="top"></td><td class="left">      hosts running origin servers and caches, SHOULD use NTP</td><td> </td><td class="right">      hosts running origin servers and caches, SHOULD use NTP</td><td class="lineno" valign="top"></td></tr>
428      <tr><td class="lineno" valign="top"></td><td class="left">      ([RFC1305]) or some similar protocol to synchronize their clocks</td><td> </td><td class="right">      ([RFC1305]) or some similar protocol to synchronize their clocks</td><td class="lineno" valign="top"></td></tr>
429      <tr><td class="lineno" valign="top"></td><td class="left">      to a globally accurate time standard.</td><td> </td><td class="right">      to a globally accurate time standard.</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">   request_time</td><td> </td><td class="right">   request_time</td><td class="lineno" valign="top"></td></tr>
432      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
433      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 13, line 48</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 14, line 7</em></th><td></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="left">   explicit in-protocol directive (e.g., by a "no-store" or "no-cache"</td><td> </td><td class="right">   explicit in-protocol directive (e.g., by a "no-store" or "no-cache"</td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="left">   cache directive, a "must-revalidate" cache-response-directive, or an</td><td> </td><td class="right">   cache directive, a "must-revalidate" cache-response-directive, or an</td><td class="lineno" valign="top"></td></tr>
436      <tr><td class="lineno" valign="top"></td><td class="left">   applicable "s-maxage" or "proxy-revalidate" cache-response-directive;</td><td> </td><td class="right">   applicable "s-maxage" or "proxy-revalidate" cache-response-directive;</td><td class="lineno" valign="top"></td></tr>
437      <tr><td class="lineno" valign="top"></td><td class="left">   see Section 3.2.2).</td><td> </td><td class="right">   see Section 3.2.2).</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 class="lineno" valign="top"></td><td class="left">   Caches SHOULD NOT return stale responses unless they are disconnected</td><td> </td><td class="right">   Caches SHOULD NOT return stale responses unless they are disconnected</td><td class="lineno" valign="top"></td></tr>
440      <tr><td class="lineno" valign="top"></td><td class="left">   (i.e., it cannot contact the origin server or otherwise find a</td><td> </td><td class="right">   (i.e., it cannot contact the origin server or otherwise find a</td><td class="lineno" valign="top"></td></tr>
441      <tr><td class="lineno" valign="top"></td><td class="left">   forward path) or otherwise explicitly allowed (e.g., the max-stale</td><td> </td><td class="right">   forward path) or otherwise explicitly allowed (e.g., the max-stale</td><td class="lineno" valign="top"></td></tr>
442      <tr><td class="lineno" valign="top"></td><td class="left">   request directive; see Section 3.2.1).</td><td> </td><td class="right">   request directive; see Section 3.2.1).</td><td class="lineno" valign="top"></td></tr>
443      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
444      <tr><td><a name="diff0036" /></td></tr>
445      <tr><td class="lineno" valign="top"></td><td class="lblock">   Stale responses SHOULD have a Warning header with the 110 <span class="delete">warn-code</span></td><td> </td><td class="rblock">   Stale responses SHOULD have a Warning header <span class="insert">field</span> with the 110 <span class="insert">warn-</span></td><td class="lineno" valign="top"></td></tr>
446      <tr><td class="lineno" valign="top"></td><td class="lblock">   (see Section 3.6).  Likewise, the 112 warn-code SHOULD be sent on</td><td> </td><td class="rblock"><span class="insert">   code</span> (see Section 3.6).  Likewise, the 112 warn-code SHOULD be sent</td><td class="lineno" valign="top"></td></tr>
447      <tr><td class="lineno" valign="top"></td><td class="lblock">   stale responses if the cache is disconnected.</td><td> </td><td class="rblock">   on stale responses if the cache is disconnected.</td><td class="lineno" valign="top"></td></tr>
448      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
449      <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>
450      <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>
451      <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>
452      <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>
453      <tr><td><a name="diff0037" /></td></tr>
454      <tr><td class="lineno" valign="top"></td><td class="lblock">   new Warning (but without removing any existing Warning <span class="delete">headers).</span>  A</td><td> </td><td class="rblock">   new Warning (but without removing any existing Warning <span class="insert">header</span></td><td class="lineno" valign="top"></td></tr>
455      <tr><td class="lineno" valign="top"></td><td class="lblock">   cache SHOULD NOT attempt to validate a response simply because that</td><td> </td><td class="rblock"><span class="insert">   fields).</span>  A cache SHOULD NOT attempt to validate a response simply</td><td class="lineno" valign="top"></td></tr>
456      <tr><td class="lineno" valign="top"></td><td class="lblock">   response became stale in transit.</td><td> </td><td class="rblock">   because that response became stale in transit.</td><td class="lineno" valign="top"></td></tr>
457      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
458      <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>
459      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
460      <tr><td class="lineno" valign="top"></td><td class="left">   When a cache has one or more stored responses for a requested URI,</td><td> </td><td class="right">   When a cache has one or more stored responses for a requested URI,</td><td class="lineno" valign="top"></td></tr>
461      <tr><td class="lineno" valign="top"></td><td class="left">   but cannot serve any of them (e.g., because they are not fresh, or</td><td> </td><td class="right">   but cannot serve any of them (e.g., because they are not fresh, or</td><td class="lineno" valign="top"></td></tr>
462      <tr><td class="lineno" valign="top"></td><td class="left">   one cannot be selected; see Section 2.7), it can use the conditional</td><td> </td><td class="right">   one cannot be selected; see Section 2.7), it can use the conditional</td><td class="lineno" valign="top"></td></tr>
463      <tr><td class="lineno" valign="top"></td><td class="left">   request mechanism [Part4] in the forwarded request to give the origin</td><td> </td><td class="right">   request mechanism [Part4] in the forwarded request to give the origin</td><td class="lineno" valign="top"></td></tr>
464      <tr><td class="lineno" valign="top"></td><td class="left">   server an opportunity to both select a valid stored response to be</td><td> </td><td class="right">   server an opportunity to both select a valid stored response to be</td><td class="lineno" valign="top"></td></tr>
465      <tr><td class="lineno" valign="top"></td><td class="left">   used, and to update it.  This process is known as "validating" or</td><td> </td><td class="right">   used, and to update it.  This process is known as "validating" or</td><td class="lineno" valign="top"></td></tr>
466      <tr><td class="lineno" valign="top"></td><td class="left">   "revalidating" the stored response.</td><td> </td><td class="right">   "revalidating" the stored response.</td><td class="lineno" valign="top"></td></tr>
467      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
468      <tr><td class="lineno" valign="top"></td><td class="left">   When sending such a conditional request, the cache SHOULD add an If-</td><td> </td><td class="right">   When sending such a conditional request, the cache SHOULD add an If-</td><td class="lineno" valign="top"></td></tr>
469      <tr><td><a name="diff0038" /></td></tr>
470      <tr><td class="lineno" valign="top"></td><td class="lblock">   Modified-Since header whose value is that of the Last-Modified header</td><td> </td><td class="rblock">   Modified-Since header <span class="insert">field</span> whose value is that of the Last-Modified</td><td class="lineno" valign="top"></td></tr>
471      <tr><td class="lineno" valign="top"></td><td class="lblock">   from the selected (see Section 2.7) stored response, if available.</td><td> </td><td class="rblock">   header <span class="insert">field</span> from the selected (see Section 2.7) stored response, if</td><td class="lineno" valign="top"></td></tr>
472      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   available.</td><td class="lineno" valign="top"></td></tr>
473      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
474      <tr><td><a name="diff0039" /></td></tr>
475      <tr><td class="lineno" valign="top"></td><td class="lblock">   Additionally, the cache SHOULD add an If-None-Match header whose</td><td> </td><td class="rblock">   Additionally, the cache SHOULD add an If-None-Match header <span class="insert">field</span></td><td class="lineno" valign="top"></td></tr>
476      <tr><td class="lineno" valign="top"></td><td class="lblock">   value is that of the ETag <span class="delete">header(s)</span> from all responses stored for the</td><td> </td><td class="rblock">   whose value is that of the ETag <span class="insert">header field(s)</span> from all responses</td><td class="lineno" valign="top"></td></tr>
477      <tr><td class="lineno" valign="top"></td><td class="lblock">   requested URI, if present.  However, if any of the stored responses</td><td> </td><td class="rblock">   stored for the requested URI, if present.  However, if any of the</td><td class="lineno" valign="top"></td></tr>
478      <tr><td class="lineno" valign="top"></td><td class="lblock">   contains only partial content, its entity-tag SHOULD NOT be included</td><td> </td><td class="rblock">   stored responses contains only partial content, its entity-tag SHOULD</td><td class="lineno" valign="top"></td></tr>
479      <tr><td class="lineno" valign="top"></td><td class="lblock">   in the If-None-Match header field unless the request is for a range</td><td> </td><td class="rblock">   NOT be included in the If-None-Match header field unless the request</td><td class="lineno" valign="top"></td></tr>
480      <tr><td class="lineno" valign="top"></td><td class="lblock">   that would be fully satisfied by that stored response.</td><td> </td><td class="rblock">   is for a range that would be fully satisfied by that stored response.</td><td class="lineno" valign="top"></td></tr>
481      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
482      <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>
483      <tr><td class="lineno" valign="top"></td><td class="left">   response can be updated and reused; see Section 2.8.</td><td> </td><td class="right">   response can be updated and reused; see Section 2.8.</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 full response (i.e., one with a response body) indicates that none</td><td> </td><td class="right">   A full response (i.e., one with a response body) indicates that none</td><td class="lineno" valign="top"></td></tr>
486      <tr><td class="lineno" valign="top"></td><td class="left">   of the stored responses nominated in the conditional request is</td><td> </td><td class="right">   of the stored responses nominated in the conditional request is</td><td class="lineno" valign="top"></td></tr>
487      <tr><td class="lineno" valign="top"></td><td class="left">   suitable.  Instead, the full response SHOULD be used to satisfy the</td><td> </td><td class="right">   suitable.  Instead, the full response SHOULD be used to satisfy the</td><td class="lineno" valign="top"></td></tr>
488      <tr><td class="lineno" valign="top"></td><td class="left">   request and MAY replace the stored response.</td><td> </td><td class="right">   request and MAY replace the stored response.</td><td class="lineno" valign="top"></td></tr>
489      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
490      <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>
491      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
492      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 15, line 7</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 15, line 14</em></th><td></td></tr>
493      <tr><td class="lineno" valign="top"></td><td class="left">   case, it MAY return a previously stored response (see Section 2.3.3).</td><td> </td><td class="right">   case, it MAY return a previously stored response (see Section 2.3.3).</td><td class="lineno" valign="top"></td></tr>
494      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
495      <tr><td class="lineno" valign="top"></td><td class="left">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>
496      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
497      <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>
498      <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>
499      <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>
500      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
501      <tr><td class="lineno" valign="top"></td><td class="left">   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>
502      <tr><td class="lineno" valign="top"></td><td class="left">   effective Request URI (Section 4.3 of [Part1]) as well as the URI(s)</td><td> </td><td class="right">   effective Request URI (Section 4.3 of [Part1]) as well as the URI(s)</td><td class="lineno" valign="top"></td></tr>
503      <tr><td><a name="diff0040" /></td></tr>
504      <tr><td class="lineno" valign="top"></td><td class="lblock">   in the Location and Content-Location headers (if present):</td><td> </td><td class="rblock">   in the Location and Content-Location header<span class="insert"> field</span>s (if present):</td><td class="lineno" valign="top"></td></tr>
505      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
506      <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>
507      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
508      <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>
509      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
510      <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>
511      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
512      <tr><td class="lineno" valign="top"></td><td class="left">   An invalidation based on a URI from a Location or Content-Location</td><td> </td><td class="right">   An invalidation based on a URI from a Location or Content-Location</td><td class="lineno" valign="top"></td></tr>
513      <tr><td><a name="diff0041" /></td></tr>
514      <tr><td class="lineno" valign="top"></td><td class="lblock">   header MUST NOT be performed if the host part of that URI differs</td><td> </td><td class="rblock">   header <span class="insert">field</span> MUST NOT be performed if the host part of that URI</td><td class="lineno" valign="top"></td></tr>
515      <tr><td class="lineno" valign="top"></td><td class="lblock">   from the host part in the effective request URI (Section 4.3 of</td><td> </td><td class="rblock">   differs from the host part in the effective request URI (Section 4.3</td><td class="lineno" valign="top"></td></tr>
516      <tr><td class="lineno" valign="top"></td><td class="lblock">   [Part1]).  This helps prevent denial of service attacks.</td><td> </td><td class="rblock">   of [Part1]).  This helps prevent denial of service attacks.</td><td class="lineno" valign="top"></td></tr>
517      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
518      <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>
519      <tr><td class="lineno" valign="top"></td><td class="left">   understand SHOULD invalidate the effective request URI (Section 4.3</td><td> </td><td class="right">   understand SHOULD invalidate the effective request URI (Section 4.3</td><td class="lineno" valign="top"></td></tr>
520      <tr><td class="lineno" valign="top"></td><td class="left">   of [Part1]).</td><td> </td><td class="right">   of [Part1]).</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 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>
523      <tr><td class="lineno" valign="top"></td><td class="left">   responses related to the effective request URI, or will mark these as</td><td> </td><td class="right">   responses related to the effective request URI, or will mark these as</td><td class="lineno" valign="top"></td></tr>
524      <tr><td class="lineno" valign="top"></td><td class="left">   "invalid" and in need of a mandatory validation before they can be</td><td> </td><td class="right">   "invalid" and in need of a mandatory validation before they can be</td><td class="lineno" valign="top"></td></tr>
525      <tr><td class="lineno" valign="top"></td><td class="left">   returned in response to a subsequent request.</td><td> </td><td class="right">   returned in response to a subsequent request.</td><td class="lineno" valign="top"></td></tr>
526      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
527      <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>
528      <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>
529      <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>
530      <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>
531      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
532      <tr><td class="lineno" valign="top"></td><td class="left">2.6.  Shared Caching of Authenticated Responses</td><td> </td><td class="right">2.6.  Shared Caching of Authenticated Responses</td><td class="lineno" valign="top"></td></tr>
533      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
534      <tr><td class="lineno" valign="top"></td><td class="left">   Shared caches MUST NOT use a cached response to a request with an</td><td> </td><td class="right">   Shared caches MUST NOT use a cached response to a request with an</td><td class="lineno" valign="top"></td></tr>
535      <tr><td><a name="diff0042" /></td></tr>
536      <tr><td class="lineno" valign="top"></td><td class="lblock">   Authorization header <span class="delete">(Section 3</span>.1 of [Part7]) to satisfy any</td><td> </td><td class="rblock">   Authorization header <span class="insert">field (Section 4</span>.1 of [Part7]) to satisfy any</td><td class="lineno" valign="top"></td></tr>
537      <tr><td class="lineno" valign="top"></td><td class="left">   subsequent request unless a cache directive that allows such</td><td> </td><td class="right">   subsequent request unless a cache directive that allows such</td><td class="lineno" valign="top"></td></tr>
538      <tr><td class="lineno" valign="top"></td><td class="left">   responses to be stored is present in the response.</td><td> </td><td class="right">   responses to be stored is present in the response.</td><td class="lineno" valign="top"></td></tr>
539      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
540      <tr><td class="lineno" valign="top"></td><td class="left">   In this specification, the following Cache-Control response</td><td> </td><td class="right">   In this specification, the following Cache-Control response</td><td class="lineno" valign="top"></td></tr>
541      <tr><td class="lineno" valign="top"></td><td class="left">   directives (Section 3.2.2) have such an effect: must-revalidate,</td><td> </td><td class="right">   directives (Section 3.2.2) have such an effect: must-revalidate,</td><td class="lineno" valign="top"></td></tr>
542      <tr><td class="lineno" valign="top"></td><td class="left">   public, s-maxage.</td><td> </td><td class="right">   public, s-maxage.</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">   Note that cached responses that contain the "must-revalidate" and/or</td><td> </td><td class="right">   Note that cached responses that contain the "must-revalidate" and/or</td><td class="lineno" valign="top"></td></tr>
545      <tr><td class="lineno" valign="top"></td><td class="left">   "s-maxage" response directives are not allowed to be served stale</td><td> </td><td class="right">   "s-maxage" response directives are not allowed to be served stale</td><td class="lineno" valign="top"></td></tr>
546      <tr><td class="lineno" valign="top"></td><td class="left">   (Section 2.3.3) by shared caches.  In particular, a response with</td><td> </td><td class="right">   (Section 2.3.3) by shared caches.  In particular, a response with</td><td class="lineno" valign="top"></td></tr>
547      <tr><td class="lineno" valign="top"></td><td class="left">   either "max-age=0, must-revalidate" or "s-maxage=0" cannot be used to</td><td> </td><td class="right">   either "max-age=0, must-revalidate" or "s-maxage=0" cannot be used to</td><td class="lineno" valign="top"></td></tr>
548      <tr><td class="lineno" valign="top"></td><td class="left">   satisfy a subsequent request without revalidating it on the origin</td><td> </td><td class="right">   satisfy a subsequent request without revalidating it on the origin</td><td class="lineno" valign="top"></td></tr>
549      <tr><td class="lineno" valign="top"></td><td class="left">   server.</td><td> </td><td class="right">   server.</td><td class="lineno" valign="top"></td></tr>
550      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
551      <tr><td class="lineno" valign="top"></td><td class="left">2.7.  Caching Negotiated Responses</td><td> </td><td class="right">2.7.  Caching Negotiated Responses</td><td class="lineno" valign="top"></td></tr>
552      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
553      <tr><td class="lineno" valign="top"></td><td class="left">   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>
554      <tr><td class="lineno" valign="top"></td><td class="left">   response that has a Vary header field (Section 3.5), it MUST NOT use</td><td> </td><td class="right">   response that has a Vary header field (Section 3.5), it MUST NOT use</td><td class="lineno" valign="top"></td></tr>
555      <tr><td><a name="diff0043" /></td></tr>
556      <tr><td class="lineno" valign="top"></td><td class="lblock">   that response unless all of the selecting <span class="delete">request-headers</span> nominated</td><td> </td><td class="rblock">   that response unless all of the selecting <span class="insert">request-header fields</span></td><td class="lineno" valign="top"></td></tr>
557      <tr><td class="lineno" valign="top"></td><td class="lblock">   by the Vary header match in both the original request (i.e., that</td><td> </td><td class="rblock">   nominated by the Vary header <span class="insert">field</span> match in both the original request</td><td class="lineno" valign="top"></td></tr>
558      <tr><td class="lineno" valign="top"></td><td class="lblock">   associated with the stored response), and the presented request.</td><td> </td><td class="rblock">   (i.e., that associated with the stored response), and the presented</td><td class="lineno" valign="top"></td></tr>
559      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   request.</td><td class="lineno" valign="top"></td></tr>
560      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
561      <tr><td><a name="diff0044" /></td></tr>
562      <tr><td class="lineno" valign="top"></td><td class="lblock">   The selecting <span class="delete">request-headers</span> from two requests are defined to match</td><td> </td><td class="rblock">   The selecting <span class="insert">request-header fields</span> from two requests are defined to</td><td class="lineno" valign="top"></td></tr>
563      <tr><td class="lineno" valign="top"></td><td class="lblock">   if and only if those in the first request can be transformed to those</td><td> </td><td class="rblock">   match if and only if those in the first request can be transformed to</td><td class="lineno" valign="top"></td></tr>
564      <tr><td class="lineno" valign="top"></td><td class="lblock">   in the second request by applying any of the following:</td><td> </td><td class="rblock">   those in the second request by applying any of the following:</td><td class="lineno" valign="top"></td></tr>
565      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
566      <tr><td><a name="diff0045" /></td></tr>
567      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  adding or removing whitespace, where allowed in the header's</td><td> </td><td class="rblock">   o  adding or removing whitespace, where allowed in the header<span class="insert"> field</span>'s</td><td class="lineno" valign="top"></td></tr>
568      <tr><td class="lineno" valign="top"></td><td class="left">      syntax</td><td> </td><td class="right">      syntax</td><td class="lineno" valign="top"></td></tr>
569      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
570      <tr><td class="lineno" valign="top"></td><td class="left">   o  combining multiple message-header fields with the same field name</td><td> </td><td class="right">   o  combining multiple message-header fields with the same field name</td><td class="lineno" valign="top"></td></tr>
571      <tr><td class="lineno" valign="top"></td><td class="left">      (see Section 3.2 of [Part1])</td><td> </td><td class="right">      (see Section 3.2 of [Part1])</td><td class="lineno" valign="top"></td></tr>
572      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
573      <tr><td><a name="diff0046" /></td></tr>
574      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  normalizing both header values in a way that is known to have</td><td> </td><td class="rblock">   o  normalizing both header <span class="insert">field</span> values in a way that is known to</td><td class="lineno" valign="top"></td></tr>
575      <tr><td class="lineno" valign="top"></td><td class="lblock">      identical semantics, according to the <span class="delete">header's</span> specification</td><td> </td><td class="rblock">      have identical semantics, according to the <span class="insert">header field's</span></td><td class="lineno" valign="top"></td></tr>
576      <tr><td class="lineno" valign="top"></td><td class="lblock">      (e.g., re-ordering field values when order is not significant;</td><td> </td><td class="rblock">      specification (e.g., re-ordering field values when order is not</td><td class="lineno" valign="top"></td></tr>
577      <tr><td class="lineno" valign="top"></td><td class="lblock">      case-normalization, where values are defined to be <span class="delete">case-</span></td><td> </td><td class="rblock">      significant; case-normalization, where values are defined to be</td><td class="lineno" valign="top"></td></tr>
578      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">      insensitive)</span></td><td> </td><td class="rblock">      <span class="insert">case-insensitive)</span></td><td class="lineno" valign="top"></td></tr>
579      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
580      <tr><td class="lineno" valign="top"></td><td class="left">   If (after any normalization that might take place) a header field is</td><td> </td><td class="right">   If (after any normalization that might take place) a header field is</td><td class="lineno" valign="top"></td></tr>
581      <tr><td class="lineno" valign="top"></td><td class="left">   absent from a request, it can only match another request if it is</td><td> </td><td class="right">   absent from a request, it can only match another request if it is</td><td class="lineno" valign="top"></td></tr>
582      <tr><td class="lineno" valign="top"></td><td class="left">   also absent there.</td><td> </td><td class="right">   also absent there.</td><td class="lineno" valign="top"></td></tr>
583      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
584      <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>
585      <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>
586      <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>
587      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
588      <tr><td><a name="diff0047" /></td></tr>
589      <tr><td class="lineno" valign="top"></td><td class="lblock">   The stored response with matching selecting <span class="delete">request-headers</span> is known</td><td> </td><td class="rblock">   The stored response with matching selecting <span class="insert">request-header fields</span> is</td><td class="lineno" valign="top"></td></tr>
590      <tr><td class="lineno" valign="top"></td><td class="lblock">   as the selected response.</td><td> </td><td class="rblock">   known as the selected response.</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 no selected response is available, the cache MAY forward the</td><td> </td><td class="right">   If no selected response is available, the cache MAY forward the</td><td class="lineno" valign="top"></td></tr>
593      <tr><td class="lineno" valign="top"></td><td class="left">   presented request to the origin server in a conditional request; see</td><td> </td><td class="right">   presented request to the origin server in a conditional request; see</td><td class="lineno" valign="top"></td></tr>
594      <tr><td class="lineno" valign="top"></td><td class="left">   Section 2.4.</td><td> </td><td class="right">   Section 2.4.</td><td class="lineno" valign="top"></td></tr>
595      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
596      <tr><td class="lineno" valign="top"></td><td class="left">2.8.  Combining Responses</td><td> </td><td class="right">2.8.  Combining Responses</td><td class="lineno" valign="top"></td></tr>
597      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
598      <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>
599      <tr><td class="lineno" valign="top"></td><td class="left">   Content) response (in this section, the "new" response"), it needs to</td><td> </td><td class="right">   Content) response (in this section, the "new" response"), it needs to</td><td class="lineno" valign="top"></td></tr>
600      <tr><td class="lineno" valign="top"></td><td class="left">   created an updated response by combining the stored response with the</td><td> </td><td class="right">   created an updated response by combining the stored response with the</td><td class="lineno" valign="top"></td></tr>
601      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
602      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 17, line 13</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 17, line 23</em></th><td></td></tr>
603      <tr><td class="lineno" valign="top"></td><td class="left">   If the new response contains an ETag, it identifies the stored</td><td> </td><td class="right">   If the new response contains an ETag, it identifies the stored</td><td class="lineno" valign="top"></td></tr>
604      <tr><td class="lineno" valign="top"></td><td class="left">   response to use.  [[TODO-mention-CL: might need language about</td><td> </td><td class="right">   response to use.  [[TODO-mention-CL: might need language about</td><td class="lineno" valign="top"></td></tr>
605      <tr><td class="lineno" valign="top"></td><td class="left">   Content-Location here]][[TODO-select-for-combine: Shouldn't this be</td><td> </td><td class="right">   Content-Location here]][[TODO-select-for-combine: Shouldn't this be</td><td class="lineno" valign="top"></td></tr>
606      <tr><td class="lineno" valign="top"></td><td class="left">   the selected response?]]</td><td> </td><td class="right">   the selected response?]]</td><td class="lineno" valign="top"></td></tr>
607      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
608      <tr><td class="lineno" valign="top"></td><td class="left">   If the new response's status code is 206 (partial content), both the</td><td> </td><td class="right">   If the new response's status code is 206 (partial content), both the</td><td class="lineno" valign="top"></td></tr>
609      <tr><td class="lineno" valign="top"></td><td class="left">   stored and new responses MUST have validators, and those validators</td><td> </td><td class="right">   stored and new responses MUST have validators, and those validators</td><td class="lineno" valign="top"></td></tr>
610      <tr><td class="lineno" valign="top"></td><td class="left">   MUST match using the strong comparison function (see Section 4 of</td><td> </td><td class="right">   MUST match using the strong comparison function (see Section 4 of</td><td class="lineno" valign="top"></td></tr>
611      <tr><td class="lineno" valign="top"></td><td class="left">   [Part4]).  Otherwise, the responses MUST NOT be combined.</td><td> </td><td class="right">   [Part4]).  Otherwise, the responses MUST NOT be combined.</td><td class="lineno" valign="top"></td></tr>
612      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
613      <tr><td><a name="diff0048" /></td></tr>
614      <tr><td class="lineno" valign="top"></td><td class="lblock">   The stored response headers are used as those of the updated</td><td> </td><td class="rblock">   The stored response header<span class="insert"> field</span>s are used as those of the updated</td><td class="lineno" valign="top"></td></tr>
615      <tr><td class="lineno" valign="top"></td><td class="left">   response, except that</td><td> </td><td class="right">   response, except that</td><td class="lineno" valign="top"></td></tr>
616      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
617      <tr><td><a name="diff0049" /></td></tr>
618      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  any stored Warning <span class="delete">headers</span> with warn-code 1xx (see Section 3.6)</td><td> </td><td class="rblock">   o  any stored Warning <span class="insert">header fields</span> with warn-code 1xx (see</td><td class="lineno" valign="top"></td></tr>
619      <tr><td class="lineno" valign="top"></td><td class="lblock">      MUST be deleted.</td><td> </td><td class="rblock">      Section 3.6) MUST be deleted.</td><td class="lineno" valign="top"></td></tr>
620      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
621      <tr><td><a name="diff0050" /></td></tr>
622      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  any stored Warning <span class="delete">headers</span> with warn-code 2xx MUST be retained.</td><td> </td><td class="rblock">   o  any stored Warning <span class="insert">header fields</span> with warn-code 2xx MUST be</td><td class="lineno" valign="top"></td></tr>
623      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">      retained.</td><td class="lineno" valign="top"></td></tr>
624      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
625      <tr><td><a name="diff0051" /></td></tr>
626      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  any other <span class="delete">headers</span> provided in the new response MUST replace all</td><td> </td><td class="rblock">   o  any other <span class="insert">header fields</span> provided in the new response MUST replace</td><td class="lineno" valign="top"></td></tr>
627      <tr><td class="lineno" valign="top"></td><td class="lblock">      instances of the corresponding <span class="delete">headers</span> from the stored response.</td><td> </td><td class="rblock">      all instances of the corresponding <span class="insert">header fields</span> from the stored</td><td class="lineno" valign="top"></td></tr>
628      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">      response.</td><td class="lineno" valign="top"></td></tr>
629      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
630      <tr><td><a name="diff0052" /></td></tr>
631      <tr><td class="lineno" valign="top"></td><td class="lblock">   The updated response <span class="delete">headers</span> MUST be used to replace those of the</td><td> </td><td class="rblock">   The updated response <span class="insert">header fields</span> MUST be used to replace those of</td><td class="lineno" valign="top"></td></tr>
632      <tr><td class="lineno" valign="top"></td><td class="lblock">   stored response in cache (unless the stored response is removed from</td><td> </td><td class="rblock">   the stored response in cache (unless the stored response is removed</td><td class="lineno" valign="top"></td></tr>
633      <tr><td class="lineno" valign="top"></td><td class="lblock">   cache).  In the case of a 206 response, the combined representation</td><td> </td><td class="rblock">   from cache).  In the case of a 206 response, the combined</td><td class="lineno" valign="top"></td></tr>
634      <tr><td class="lineno" valign="top"></td><td class="lblock">   MAY be stored.</td><td> </td><td class="rblock">   representation MAY be stored.</td><td class="lineno" valign="top"></td></tr>
635      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
636      <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>
637      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
638      <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>
639      <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>
640      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
641      <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>
642      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
643      <tr><td class="lineno" valign="top"></td><td class="left">   The "Age" response-header field conveys the sender's estimate of the</td><td> </td><td class="right">   The "Age" response-header field conveys the sender's estimate of the</td><td class="lineno" valign="top"></td></tr>
644      <tr><td class="lineno" valign="top"></td><td class="left">   amount of time since the response was generated or successfully</td><td> </td><td class="right">   amount of time since the response was generated or successfully</td><td class="lineno" valign="top"></td></tr>
645      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
646      <tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 17, line 51</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 18, line 15</em></th><td></td></tr>
647      <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>
648      <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>
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">   Age field-values are non-negative integers, representing time in</td><td> </td><td class="right">   Age field-values are non-negative integers, representing time in</td><td class="lineno" valign="top"></td></tr>
651      <tr><td class="lineno" valign="top"></td><td class="left">   seconds.</td><td> </td><td class="right">   seconds.</td><td class="lineno" valign="top"></td></tr>
652      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
653      <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>
654      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
655      <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>
656      <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>
657      <tr><td><a name="diff0053" /></td></tr>
658      <tr><td class="lineno" valign="top"></td><td class="lblock">   MUST transmit an Age header with a field-value of 2147483648 (2^31).</td><td> </td><td class="rblock">   MUST transmit an Age header <span class="insert">field</span> with a field-value of 2147483648</td><td class="lineno" valign="top"></td></tr>
659      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                                         </td><td> </td><td class="rblock">   (2^31).  Caches SHOULD use an arithmetic type of at least 31 bits of</td><td class="lineno" valign="top"></td></tr>
660      <tr><td class="lineno" valign="top"></td><td class="lblock">   Caches SHOULD use an arithmetic type of at least 31 bits of range.</td><td> </td><td class="rblock">   range.</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">   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>
663      <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>
664      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP/1.0 caches might not implement the Age header field.</td><td> </td><td class="right">   HTTP/1.0 caches might not implement the Age header field.</td><td class="lineno" valign="top"></td></tr>
665      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
666      <tr><td class="lineno" valign="top"></td><td class="left">3.2.  Cache-Control</td><td> </td><td class="right">3.2.  Cache-Control</td><td class="lineno" valign="top"></td></tr>
667      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
668      <tr><td class="lineno" valign="top"></td><td class="left">   The "Cache-Control" general-header field is used to specify</td><td> </td><td class="right">   The "Cache-Control" general-header field is used to specify</td><td class="lineno" valign="top"></td></tr>
669      <tr><td class="lineno" valign="top"></td><td class="left">   directives for caches along the request/response chain.  Such cache</td><td> </td><td class="right">   directives for caches along the request/response chain.  Such cache</td><td class="lineno" valign="top"></td></tr>
670      <tr><td class="lineno" valign="top"></td><td class="left">   directives are unidirectional in that the presence of a directive in</td><td> </td><td class="right">   directives are unidirectional in that the presence of a directive in</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-l11" /><small>skipping to change at</small><em> page 20, line 9</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 20, line 18</em></th><td></td></tr>
673      <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>
674      <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>
675      <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>
676      <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>
677      <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>
678      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
679      <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>
680      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
681      <tr><td class="lineno" valign="top"></td><td class="left">      The no-transform request directive indicates that an intermediate</td><td> </td><td class="right">      The no-transform request directive indicates that an intermediate</td><td class="lineno" valign="top"></td></tr>
682      <tr><td class="lineno" valign="top"></td><td class="left">      cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td> </td><td class="right">      cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td class="lineno" valign="top"></td></tr>
683      <tr><td><a name="diff0054" /></td></tr>
684      <tr><td class="lineno" valign="top"></td><td class="lblock">      or Content-Type request <span class="delete">headers,</span> nor the request representation.</td><td> </td><td class="rblock">      or Content-Type request <span class="insert">header fields,</span> nor the request</td><td class="lineno" valign="top"></td></tr>
685      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">      representation.</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">   only-if-cached</td><td> </td><td class="right">   only-if-cached</td><td class="lineno" valign="top"></td></tr>
688      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
689      <tr><td class="lineno" valign="top"></td><td class="left">      The only-if-cached request directive indicates that the client</td><td> </td><td class="right">      The only-if-cached request directive indicates that the client</td><td class="lineno" valign="top"></td></tr>
690      <tr><td class="lineno" valign="top"></td><td class="left">      only wishes to return a stored response.  If it receives this</td><td> </td><td class="right">      only wishes to return a stored response.  If it receives this</td><td class="lineno" valign="top"></td></tr>
691      <tr><td class="lineno" valign="top"></td><td class="left">      directive, a cache SHOULD either respond using a stored response</td><td> </td><td class="right">      directive, a cache SHOULD either respond using a stored response</td><td class="lineno" valign="top"></td></tr>
692      <tr><td class="lineno" valign="top"></td><td class="left">      that is consistent with the other constraints of the request, or</td><td> </td><td class="right">      that is consistent with the other constraints of the request, or</td><td class="lineno" valign="top"></td></tr>
693      <tr><td class="lineno" valign="top"></td><td class="left">      respond with a 504 (Gateway Timeout) status code.  If a group of</td><td> </td><td class="right">      respond with a 504 (Gateway Timeout) status code.  If a group of</td><td class="lineno" valign="top"></td></tr>
694      <tr><td class="lineno" valign="top"></td><td class="left">      caches is being operated as a unified system with good internal</td><td> </td><td class="right">      caches is being operated as a unified system with good internal</td><td class="lineno" valign="top"></td></tr>
695      <tr><td class="lineno" valign="top"></td><td class="left">      connectivity, such a request MAY be forwarded within that group of</td><td> </td><td class="right">      connectivity, such a request MAY be forwarded within that group of</td><td class="lineno" valign="top"></td></tr>
696      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
697      <tr bgcolor="gray" ><td></td><th><a name="part-l12" /><small>skipping to change at</small><em> page 20, line 41</em></th><th> </th><th><a name="part-r12" /><small>skipping to change at</small><em> page 20, line 51</em></th><td></td></tr>
698      <tr><td class="lineno" valign="top"></td><td class="left">        / "proxy-revalidate"</td><td> </td><td class="right">        / "proxy-revalidate"</td><td class="lineno" valign="top"></td></tr>
699      <tr><td class="lineno" valign="top"></td><td class="left">        / "max-age" "=" delta-seconds</td><td> </td><td class="right">        / "max-age" "=" delta-seconds</td><td class="lineno" valign="top"></td></tr>
700      <tr><td class="lineno" valign="top"></td><td class="left">        / "s-maxage" "=" delta-seconds</td><td> </td><td class="right">        / "s-maxage" "=" delta-seconds</td><td class="lineno" valign="top"></td></tr>
701      <tr><td class="lineno" valign="top"></td><td class="left">        / cache-extension</td><td> </td><td class="right">        / cache-extension</td><td class="lineno" valign="top"></td></tr>
702      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
703      <tr><td class="lineno" valign="top"></td><td class="left">   public</td><td> </td><td class="right">   public</td><td class="lineno" valign="top"></td></tr>
704      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
705      <tr><td class="lineno" valign="top"></td><td class="left">      The public response directive indicates that the response MAY be</td><td> </td><td class="right">      The public response directive indicates that the response MAY be</td><td class="lineno" valign="top"></td></tr>
706      <tr><td class="lineno" valign="top"></td><td class="left">      cached, even if it would normally be non-cacheable or cacheable</td><td> </td><td class="right">      cached, even if it would normally be non-cacheable or cacheable</td><td class="lineno" valign="top"></td></tr>
707      <tr><td class="lineno" valign="top"></td><td class="left">      only within a non-shared cache.  (See also Authorization, Section</td><td> </td><td class="right">      only within a non-shared cache.  (See also Authorization, Section</td><td class="lineno" valign="top"></td></tr>
708      <tr><td><a name="diff0055" /></td></tr>
709      <tr><td class="lineno" valign="top"></td><td class="lblock">      <span class="delete">3</span>.1 of [Part7], for additional details.)</td><td> </td><td class="rblock">      <span class="insert">4</span>.1 of [Part7], for additional details.)</td><td class="lineno" valign="top"></td></tr>
710      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
711      <tr><td class="lineno" valign="top"></td><td class="left">   private</td><td> </td><td class="right">   private</td><td class="lineno" valign="top"></td></tr>
712      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
713      <tr><td class="lineno" valign="top"></td><td class="left">      The private response directive indicates that the response message</td><td> </td><td class="right">      The private response directive indicates that the response message</td><td class="lineno" valign="top"></td></tr>
714      <tr><td class="lineno" valign="top"></td><td class="left">      is intended for a single user and MUST NOT be stored by a shared</td><td> </td><td class="right">      is intended for a single user and MUST NOT be stored by a shared</td><td class="lineno" valign="top"></td></tr>
715      <tr><td class="lineno" valign="top"></td><td class="left">      cache.  A private (non-shared) cache MAY store the response.</td><td> </td><td class="right">      cache.  A private (non-shared) cache MAY store the response.</td><td class="lineno" valign="top"></td></tr>
716      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
717      <tr><td class="lineno" valign="top"></td><td class="left">      If the private response directive specifies one or more field-</td><td> </td><td class="right">      If the private response directive specifies one or more field-</td><td class="lineno" valign="top"></td></tr>
718      <tr><td class="lineno" valign="top"></td><td class="left">      names, this requirement is limited to the field-values associated</td><td> </td><td class="right">      names, this requirement is limited to the field-values associated</td><td class="lineno" valign="top"></td></tr>
719      <tr><td><a name="diff0056" /></td></tr>
720      <tr><td class="lineno" valign="top"></td><td class="lblock">      with the listed response <span class="delete">headers.</span>  That is, the specified <span class="delete">field-</span></td><td> </td><td class="rblock">      with the listed response <span class="insert">header fields.</span>  That is, the specified</td><td class="lineno" valign="top"></td></tr>
721      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">      names(s)</span> MUST NOT be stored by a shared cache, whereas the</td><td> </td><td class="rblock">      <span class="insert">field-names(s)</span> MUST NOT be stored by a shared cache, whereas the</td><td class="lineno" valign="top"></td></tr>
722      <tr><td class="lineno" valign="top"></td><td class="left">      remainder of the response message MAY be.</td><td> </td><td class="right">      remainder of the response message MAY be.</td><td class="lineno" valign="top"></td></tr>
723      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
724      <tr><td class="lineno" valign="top"></td><td class="left">      Note: This usage of the word private only controls where the</td><td> </td><td class="right">      Note: This usage of the word private only controls where the</td><td class="lineno" valign="top"></td></tr>
725      <tr><td class="lineno" valign="top"></td><td class="left">      response can be stored; it cannot ensure the privacy of the</td><td> </td><td class="right">      response can be stored; it cannot ensure the privacy of the</td><td class="lineno" valign="top"></td></tr>
726      <tr><td class="lineno" valign="top"></td><td class="left">      message content.  Also, private response directives with field-</td><td> </td><td class="right">      message content.  Also, private response directives with field-</td><td class="lineno" valign="top"></td></tr>
727      <tr><td class="lineno" valign="top"></td><td class="left">      names are often handled by implementations as if an unqualified</td><td> </td><td class="right">      names are often handled by implementations as if an unqualified</td><td class="lineno" valign="top"></td></tr>
728      <tr><td class="lineno" valign="top"></td><td class="left">      private directive was received; i.e., the special handling for the</td><td> </td><td class="right">      private directive was received; i.e., the special handling for the</td><td class="lineno" valign="top"></td></tr>
729      <tr><td class="lineno" valign="top"></td><td class="left">      qualified form is not widely implemented.</td><td> </td><td class="right">      qualified form is not widely implemented.</td><td class="lineno" valign="top"></td></tr>
730      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
731      <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>
732      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
733      <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>
734      <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>
735      <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>
736      <tr><td class="lineno" valign="top"></td><td class="left">      prevent a cache from using it to satisfy a request without</td><td> </td><td class="right">      prevent a cache from using it to satisfy a request without</td><td class="lineno" valign="top"></td></tr>
737      <tr><td class="lineno" valign="top"></td><td class="left">      contacting it, even by caches that have been configured to return</td><td> </td><td class="right">      contacting it, even by caches that have been configured to return</td><td class="lineno" valign="top"></td></tr>
738      <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>
739      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
740      <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>
741      <tr><td class="lineno" valign="top"></td><td class="left">      names, this requirement is limited to the field-values associated</td><td> </td><td class="right">      names, this requirement is limited to the field-values associated</td><td class="lineno" valign="top"></td></tr>
742      <tr><td><a name="diff0057" /></td></tr>
743      <tr><td class="lineno" valign="top"></td><td class="lblock">      with the listed response <span class="delete">headers.</span>  That is, the specified <span class="delete">field-</span></td><td> </td><td class="rblock">      with the listed response <span class="insert">header fields.</span>  That is, the specified</td><td class="lineno" valign="top"></td></tr>
744      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">      name(s)</span> MUST NOT be sent in the response to a subsequent request</td><td> </td><td class="rblock">      <span class="insert">field-name(s)</span> MUST NOT be sent in the response to a subsequent</td><td class="lineno" valign="top"></td></tr>
745      <tr><td class="lineno" valign="top"></td><td class="lblock">      without successful validation on the origin server.  This allows</td><td> </td><td class="rblock">      request without successful validation on the origin server.  This</td><td class="lineno" valign="top"></td></tr>
746      <tr><td class="lineno" valign="top"></td><td class="lblock">      an origin server to prevent the re-use of certain header fields in</td><td> </td><td class="rblock">      allows an origin server to prevent the re-use of certain header</td><td class="lineno" valign="top"></td></tr>
747      <tr><td class="lineno" valign="top"></td><td class="lblock">      a response, while still allowing caching of the rest of the</td><td> </td><td class="rblock">      fields in a response, while still allowing caching of the rest of</td><td class="lineno" valign="top"></td></tr>
748      <tr><td class="lineno" valign="top"></td><td class="lblock">      response.</td><td> </td><td class="rblock">      the response.</td><td class="lineno" valign="top"></td></tr>
749      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
750      <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>
751      <tr><td class="lineno" valign="top"></td><td class="left">      directive.  Also, no-cache response directives with field-names</td><td> </td><td class="right">      directive.  Also, no-cache response directives with field-names</td><td class="lineno" valign="top"></td></tr>
752      <tr><td class="lineno" valign="top"></td><td class="left">      are often handled by implementations as if an unqualified no-cache</td><td> </td><td class="right">      are often handled by implementations as if an unqualified no-cache</td><td class="lineno" valign="top"></td></tr>
753      <tr><td class="lineno" valign="top"></td><td class="left">      directive was received; i.e., the special handling for the</td><td> </td><td class="right">      directive was received; i.e., the special handling for the</td><td class="lineno" valign="top"></td></tr>
754      <tr><td class="lineno" valign="top"></td><td class="left">      qualified form is not widely implemented.</td><td> </td><td class="right">      qualified form is not widely implemented.</td><td class="lineno" valign="top"></td></tr>
755      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
756      <tr><td class="lineno" valign="top"></td><td class="left">   no-store</td><td> </td><td class="right">   no-store</td><td class="lineno" valign="top"></td></tr>
757      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
758      <tr><td class="lineno" valign="top"></td><td class="left">      The no-store response directive indicates that a cache MUST NOT</td><td> </td><td class="right">      The no-store response directive indicates that a cache MUST NOT</td><td class="lineno" valign="top"></td></tr>
759      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
760      <tr bgcolor="gray" ><td></td><th><a name="part-l13" /><small>skipping to change at</small><em> page 22, line 39</em></th><th> </th><th><a name="part-r13" /><small>skipping to change at</small><em> page 22, line 48</em></th><td></td></tr>
761      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"&g