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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-13.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p6-cache-14.txt&nbsp;</th><th></th></tr> 
39      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
40      <tr><td class="lineno" valign="top"></td><td class="left">HTTPbis Working Group                                   R. Fielding, Ed.</td><td> </td><td class="right">HTTPbis Working Group                                   R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
41      <tr><td class="lineno" valign="top"></td><td class="left">Internet-Draft                                                     Adobe</td><td> </td><td class="right">Internet-Draft                                                     Adobe</td><td class="lineno" valign="top"></td></tr>
42      <tr><td class="lineno" valign="top"></td><td class="left">Obsoletes: 2616 (if approved)                                  J. Gettys</td><td> </td><td class="right">Obsoletes: 2616 (if approved)                                  J. Gettys</td><td class="lineno" valign="top"></td></tr>
43      <tr><td class="lineno" valign="top"></td><td class="left">Intended status: Standards Track                          Alcatel-Lucent</td><td> </td><td class="right">Intended status: Standards Track                          Alcatel-Lucent</td><td class="lineno" valign="top"></td></tr>
44      <tr><td><a name="diff0001" /></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">September 15, 2011</span>                                     J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">October 20, 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</td><td> </td><td class="right">                                                                   Adobe</td><td class="lineno" valign="top"></td></tr>
51      <tr><td class="lineno" valign="top"></td><td class="left">                                                                P. Leach</td><td> </td><td class="right">                                                                P. Leach</td><td class="lineno" valign="top"></td></tr>
52      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
53      <tr><td class="lineno" valign="top"></td><td class="left">                                                          T. Berners-Lee</td><td> </td><td class="right">                                                          T. Berners-Lee</td><td class="lineno" valign="top"></td></tr>
54      <tr><td class="lineno" valign="top"></td><td class="left">                                                                 W3C/MIT</td><td> </td><td class="right">                                                                 W3C/MIT</td><td class="lineno" valign="top"></td></tr>
55      <tr><td class="lineno" valign="top"></td><td class="left">                                                           Y. Lafon, Ed.</td><td> </td><td class="right">                                                           Y. Lafon, Ed.</td><td class="lineno" valign="top"></td></tr>
56      <tr><td class="lineno" valign="top"></td><td class="left">                                                                     W3C</td><td> </td><td class="right">                                                                     W3C</td><td class="lineno" valign="top"></td></tr>
57      <tr><td class="lineno" valign="top"></td><td class="left">                                                      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">March 14</span>, 2011</td><td> </td><td class="rblock">                                                          <span class="insert">April 18</span>, 2011</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">3</span></td><td> </td><td class="rblock">                     draft-ietf-httpbis-p6-cache-1<span class="insert">4</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><a name="diff0004" /></td></tr>
82      <tr><td class="lineno" valign="top"></td><td class="lblock">   group mailing list <span class="delete">(ietf-http-wg@w3.org).</span>  The current issues list is</td><td> </td><td class="rblock">   group mailing list <span class="insert">(ietf-http-wg@w3.org), which is archived at</span></td><td class="lineno" valign="top"></td></tr>
83      <tr><td class="lineno" valign="top"></td><td class="lblock">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td> </td><td class="rblock"><span class="insert">   &lt;http://lists.w3.org/Archives/Public/ietf-http-wg/&gt;.</span></td><td class="lineno" valign="top"></td></tr>
84      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
85      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   The current issues list is at</td><td class="lineno" valign="top"></td></tr>
86      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td class="lineno" valign="top"></td></tr>
87      <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>
88      <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>
89      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
90      <tr><td><a name="diff0005" /></td></tr>
91      <tr><td class="lineno" valign="top"></td><td class="lblock">   The changes in this draft are summarized in Appendix C.1<span class="delete">4</span>.</td><td> </td><td class="rblock">   The changes in this draft are summarized in Appendix C.1<span class="insert">5</span>.</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">Status of This Memo</td><td> </td><td class="right">Status of This Memo</td><td class="lineno" valign="top"></td></tr>
94      <tr><td><a name="diff0006" /></td></tr>
95      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">                                                                         </span></td><td class="lineno" valign="top"></td></tr>
96      <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>
97      <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>
98      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
99      <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>
100      <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>
101      <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>
102      <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>
103      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
104      <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>
105      <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>
106      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
107      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 2, line 17</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 2, line 20</em></th><td></td></tr>
108      <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>
109      <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>
110      <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>
111      <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>
112      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
113      <tr><td class="lineno" valign="top"></td><td class="left">   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>
114      <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>
115      <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>
116      <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>
117      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
118      <tr><td><a name="diff0007" /></td></tr>
119      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on <span class="delete">September 15</span>, 2011.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">October 20</span>, 2011.</td><td class="lineno" valign="top"></td></tr>
120      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
121      <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>
122      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="left">   Copyright (c) 2011 IETF Trust and the persons identified as the</td><td> </td><td class="right">   Copyright (c) 2011 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
124      <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>
125      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
126      <tr><td class="lineno" valign="top"></td><td class="left">   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>
127      <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>
128      <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>
129      <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>
130      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
131      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 4, line 10</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 4, line 12</em></th><td></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="left">     C.5.  Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . 35</td><td> </td><td class="right">     C.5.  Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . 35</td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="left">     C.6.  Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . 35</td><td> </td><td class="right">     C.6.  Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . 35</td><td class="lineno" valign="top"></td></tr>
134      <tr><td class="lineno" valign="top"></td><td class="left">     C.7.  Since draft-ietf-httpbis-p6-cache-05 . . . . . . . . . . . 36</td><td> </td><td class="right">     C.7.  Since draft-ietf-httpbis-p6-cache-05 . . . . . . . . . . . 36</td><td class="lineno" valign="top"></td></tr>
135      <tr><td class="lineno" valign="top"></td><td class="left">     C.8.  Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . 36</td><td> </td><td class="right">     C.8.  Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . 36</td><td class="lineno" valign="top"></td></tr>
136      <tr><td class="lineno" valign="top"></td><td class="left">     C.9.  Since draft-ietf-httpbis-p6-cache-07 . . . . . . . . . . . 36</td><td> </td><td class="right">     C.9.  Since draft-ietf-httpbis-p6-cache-07 . . . . . . . . . . . 36</td><td class="lineno" valign="top"></td></tr>
137      <tr><td class="lineno" valign="top"></td><td class="left">     C.10. Since draft-ietf-httpbis-p6-cache-08 . . . . . . . . . . . 37</td><td> </td><td class="right">     C.10. Since draft-ietf-httpbis-p6-cache-08 . . . . . . . . . . . 37</td><td class="lineno" valign="top"></td></tr>
138      <tr><td class="lineno" valign="top"></td><td class="left">     C.11. Since draft-ietf-httpbis-p6-cache-09 . . . . . . . . . . . 37</td><td> </td><td class="right">     C.11. Since draft-ietf-httpbis-p6-cache-09 . . . . . . . . . . . 37</td><td class="lineno" valign="top"></td></tr>
139      <tr><td class="lineno" valign="top"></td><td class="left">     C.12. Since draft-ietf-httpbis-p6-cache-10 . . . . . . . . . . . 38</td><td> </td><td class="right">     C.12. Since draft-ietf-httpbis-p6-cache-10 . . . . . . . . . . . 38</td><td class="lineno" valign="top"></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="left">     C.13. Since draft-ietf-httpbis-p6-cache-11 . . . . . . . . . . . 38</td><td> </td><td class="right">     C.13. Since draft-ietf-httpbis-p6-cache-11 . . . . . . . . . . . 38</td><td class="lineno" valign="top"></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="left">     C.14. Since draft-ietf-httpbis-p6-cache-12 . . . . . . . . . . . 38</td><td> </td><td class="right">     C.14. Since draft-ietf-httpbis-p6-cache-12 . . . . . . . . . . . 38</td><td class="lineno" valign="top"></td></tr>
142      <tr><td><a name="diff0008" /></td></tr>
143      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     C.15. Since draft-ietf-httpbis-p6-cache-13 . . . . . . . . . . . 38</span></td><td class="lineno" valign="top"></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="left">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38</td><td> </td><td class="right">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38</td><td class="lineno" valign="top"></td></tr>
145      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
146      <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>
147      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
148      <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>
149      <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>
150      <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>
151      <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>
152      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
153      <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>
154      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
155      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 10, line 13</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 10, line 13</em></th><td></td></tr>
156      <tr><td class="lineno" valign="top"></td><td class="left">   request and having received a corresponding response.</td><td> </td><td class="right">   request and having received a corresponding response.</td><td class="lineno" valign="top"></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
158      <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>
159      <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>
160      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
161      <tr><td class="lineno" valign="top"></td><td class="left">   A cache MUST use the most recent response (as determined by the Date</td><td> </td><td class="right">   A cache MUST use the most recent response (as determined by the Date</td><td class="lineno" valign="top"></td></tr>
162      <tr><td class="lineno" valign="top"></td><td class="left">   header field) when more than one suitable response is stored.  It can</td><td> </td><td class="right">   header field) when more than one suitable response is stored.  It can</td><td class="lineno" valign="top"></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="left">   also forward a request with "Cache-Control: max-age=0" or "Cache-</td><td> </td><td class="right">   also forward a request with "Cache-Control: max-age=0" or "Cache-</td><td class="lineno" valign="top"></td></tr>
164      <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>
165      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
166      <tr><td><a name="diff0009" /></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="lblock">   A cache that does not have a clock available MUST NOT use<span class="delete">d</span> stored</td><td> </td><td class="rblock">   A cache that does not have a clock available MUST NOT use stored</td><td class="lineno" valign="top"></td></tr>
168      <tr><td class="lineno" valign="top"></td><td class="left">   responses without revalidating them on every use.  A cache,</td><td> </td><td class="right">   responses without revalidating them on every use.  A cache,</td><td class="lineno" valign="top"></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="left">   especially a shared cache, SHOULD use a mechanism, such as NTP</td><td> </td><td class="right">   especially a shared cache, SHOULD use a mechanism, such as NTP</td><td class="lineno" valign="top"></td></tr>
170      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC1305], to synchronize its clock with a reliable external</td><td> </td><td class="right">   [RFC1305], to synchronize its clock with a reliable external</td><td class="lineno" valign="top"></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="left">   standard.</td><td> </td><td class="right">   standard.</td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
173      <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>
174      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
175      <tr><td class="lineno" valign="top"></td><td class="left">   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>
176      <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>
177      <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>
178      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
179      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 12, line 5</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 12, line 5</em></th><td></td></tr>
180      <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>
181      <tr><td class="lineno" valign="top"></td><td class="left">   300, 301 and 410), a cache MAY calculate a heuristic expiration time.</td><td> </td><td class="right">   300, 301 and 410), a cache MAY calculate a heuristic expiration time.</td><td class="lineno" valign="top"></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="left">   A cache MUST NOT use heuristics to determine freshness for responses</td><td> </td><td class="right">   A cache MUST NOT use heuristics to determine freshness for responses</td><td class="lineno" valign="top"></td></tr>
183      <tr><td class="lineno" valign="top"></td><td class="left">   with status codes that do not explicitly allow it.</td><td> </td><td class="right">   with status codes that do not explicitly allow it.</td><td class="lineno" valign="top"></td></tr>
184      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="left">   When a heuristic is used to calculate freshness lifetime, a cache</td><td> </td><td class="right">   When a heuristic is used to calculate freshness lifetime, a cache</td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="left">   SHOULD attach a Warning header field with a 113 warn-code to the</td><td> </td><td class="right">   SHOULD attach a Warning header field with a 113 warn-code to the</td><td class="lineno" valign="top"></td></tr>
187      <tr><td class="lineno" valign="top"></td><td class="left">   response if its current_age is more than 24 hours and such a warning</td><td> </td><td class="right">   response if its current_age is more than 24 hours and such a warning</td><td class="lineno" valign="top"></td></tr>
188      <tr><td class="lineno" valign="top"></td><td class="left">   is not already present.</td><td> </td><td class="right">   is not already present.</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><a name="diff0010" /></td></tr>
191      <tr><td class="lineno" valign="top"></td><td class="lblock">   Also, if the response has a Last-Modified header field (Section <span class="delete">6.6</span></td><td> </td><td class="rblock">   Also, if the response has a Last-Modified header field (Section <span class="insert">2.1</span></td><td class="lineno" valign="top"></td></tr>
192      <tr><td class="lineno" valign="top"></td><td class="left">   of [Part4]), a cache SHOULD NOT use a heuristic expiration value that</td><td> </td><td class="right">   of [Part4]), a cache SHOULD NOT use a heuristic expiration value that</td><td class="lineno" valign="top"></td></tr>
193      <tr><td class="lineno" valign="top"></td><td class="left">   is more than some fraction of the interval since that time.  A</td><td> </td><td class="right">   is more than some fraction of the interval since that time.  A</td><td class="lineno" valign="top"></td></tr>
194      <tr><td class="lineno" valign="top"></td><td class="left">   typical setting of this fraction might be 10%.</td><td> </td><td class="right">   typical setting of this fraction might be 10%.</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">      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>
197      <tr><td class="lineno" valign="top"></td><td class="left">      not calculate heuristic freshness for URIs with query components</td><td> </td><td class="right">      not calculate heuristic freshness for URIs with query components</td><td class="lineno" valign="top"></td></tr>
198      <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>
199      <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>
200      <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>
201      <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>
202      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
203      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 14, line 9</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 14, line 9</em></th><td></td></tr>
204      <tr><td class="lineno" valign="top"></td><td class="left">   according to the calculations in Section 2.3.</td><td> </td><td class="right">   according to the calculations in Section 2.3.</td><td class="lineno" valign="top"></td></tr>
205      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
206      <tr><td class="lineno" valign="top"></td><td class="left">   A cache MUST NOT return a stale response if it is prohibited by an</td><td> </td><td class="right">   A cache MUST NOT return a stale response if it is prohibited by an</td><td class="lineno" valign="top"></td></tr>
207      <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>
208      <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>
209      <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>
210      <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>
211      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
212      <tr><td class="lineno" valign="top"></td><td class="left">   A cache SHOULD NOT return stale responses unless it is disconnected</td><td> </td><td class="right">   A cache SHOULD NOT return stale responses unless it is disconnected</td><td class="lineno" valign="top"></td></tr>
213      <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>
214      <tr><td><a name="diff0011" /></td></tr>
215      <tr><td class="lineno" valign="top"></td><td class="lblock">   forward path) or <span class="delete">otherwise</span> explicitly allowed (e.g., the <span class="delete">max-stale</span></td><td> </td><td class="rblock">   forward path) or <span class="insert">doing so is</span> explicitly allowed (e.g., <span class="insert">by</span> the <span class="insert">max-</span></td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="lblock">   request directive; see Section 3.2.1).</td><td> </td><td class="rblock"><span class="insert">   stale</span> request directive; see Section 3.2.1).</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">   A cache SHOULD append a Warning header field with the 110 warn-code</td><td> </td><td class="right">   A cache SHOULD append a Warning header field with the 110 warn-code</td><td class="lineno" valign="top"></td></tr>
219      <tr><td class="lineno" valign="top"></td><td class="left">   (see Section 3.6) to stale responses.  Likewise, a cache SHOULD add</td><td> </td><td class="right">   (see Section 3.6) to stale responses.  Likewise, a cache SHOULD add</td><td class="lineno" valign="top"></td></tr>
220      <tr><td class="lineno" valign="top"></td><td class="left">   the 112 warn-code to stale responses if the cache is disconnected.</td><td> </td><td class="right">   the 112 warn-code to stale responses if the cache is disconnected.</td><td class="lineno" valign="top"></td></tr>
221      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
222      <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>
223      <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>
224      <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>
225      <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>
226      <tr><td class="lineno" valign="top"></td><td class="left">   new Warning (but without removing any existing Warning header</td><td> </td><td class="right">   new Warning (but without removing any existing Warning header</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-l7" /><small>skipping to change at</small><em> page 17, line 26</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 17, line 26</em></th><td></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
230      <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>
231      <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>
232      <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>
233      <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>
234      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
235      <tr><td class="lineno" valign="top"></td><td class="left">   When the new response's status code is 206 (partial content), a cache</td><td> </td><td class="right">   When the new response's status code is 206 (partial content), a cache</td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="left">   MUST NOT combine it with the old response if either response does not</td><td> </td><td class="right">   MUST NOT combine it with the old response if either response does not</td><td class="lineno" valign="top"></td></tr>
237      <tr><td class="lineno" valign="top"></td><td class="left">   have a validator, and MUST NOT combine it with the old response when</td><td> </td><td class="right">   have a validator, and MUST NOT combine it with the old response when</td><td class="lineno" valign="top"></td></tr>
238      <tr><td class="lineno" valign="top"></td><td class="left">   those validators do not match with the strong comparison function</td><td> </td><td class="right">   those validators do not match with the strong comparison function</td><td class="lineno" valign="top"></td></tr>
239      <tr><td><a name="diff0012" /></td></tr>
240      <tr><td class="lineno" valign="top"></td><td class="lblock">   (see Section <span class="delete">4</span> of [Part4]).</td><td> </td><td class="rblock">   (see Section <span class="insert">2.2.2</span> of [Part4]).</td><td class="lineno" valign="top"></td></tr>
241      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
242      <tr><td class="lineno" valign="top"></td><td class="left">   The stored response header fields are used as those of the updated</td><td> </td><td class="right">   The stored response header fields are used as those of the updated</td><td class="lineno" valign="top"></td></tr>
243      <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>
244      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
245      <tr><td class="lineno" valign="top"></td><td class="left">   o  a cache MUST delete any stored Warning header fields with warn-</td><td> </td><td class="right">   o  a cache MUST delete any stored Warning header fields with warn-</td><td class="lineno" valign="top"></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="left">      code 1xx (see Section 3.6).</td><td> </td><td class="right">      code 1xx (see Section 3.6).</td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
248      <tr><td class="lineno" valign="top"></td><td class="left">   o  a cache MUST retain any stored Warning header fields with warn-</td><td> </td><td class="right">   o  a cache MUST retain any stored Warning header fields with warn-</td><td class="lineno" valign="top"></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="left">      code 2xx.</td><td> </td><td class="right">      code 2xx.</td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
251      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
252      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 18, line 12</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 18, line 12</em></th><td></td></tr>
253      <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>
254      <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>
255      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
256      <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>
257      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
258      <tr><td class="lineno" valign="top"></td><td class="left">   The "Age" header field conveys the sender's estimate of the amount of</td><td> </td><td class="right">   The "Age" header field conveys the sender's estimate of the amount of</td><td class="lineno" valign="top"></td></tr>
259      <tr><td class="lineno" valign="top"></td><td class="left">   time since the response was generated or successfully validated at</td><td> </td><td class="right">   time since the response was generated or successfully validated at</td><td class="lineno" valign="top"></td></tr>
260      <tr><td class="lineno" valign="top"></td><td class="left">   the origin server.  Age values are calculated as specified in</td><td> </td><td class="right">   the origin server.  Age values are calculated as specified in</td><td class="lineno" valign="top"></td></tr>
261      <tr><td class="lineno" valign="top"></td><td class="left">   Section 2.3.2.</td><td> </td><td class="right">   Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
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="diff0013" /></td></tr>
264      <tr><td class="lineno" valign="top"></td><td class="lblock">     Age   = <span class="delete">"Age" ":" OWS Age-v</span></td><td> </td><td class="rblock">     Age = delta-seconds</td><td class="lineno" valign="top"></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     Age-v =</span> delta-seconds</td><td> </td><td class="rblock"></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">   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>
268      <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>
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">     delta-seconds  = 1*DIGIT</td><td> </td><td class="right">     delta-seconds  = 1*DIGIT</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">   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>
273      <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>
274      <tr><td class="lineno" valign="top"></td><td class="left">   MUST transmit an Age header field with a field-value of 2147483648</td><td> </td><td class="right">   MUST transmit an Age header field with a field-value of 2147483648</td><td class="lineno" valign="top"></td></tr>
275      <tr><td class="lineno" valign="top"></td><td class="left">   (2^31).  Recipients parsing the Age header field-value SHOULD use an</td><td> </td><td class="right">   (2^31).  Recipients parsing the Age header field-value SHOULD use an</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-l9" /><small>skipping to change at</small><em> page 19, line 5</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 19, line 5</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">      Note: HTTP/1.0 caches might not implement Cache-Control and might</td><td> </td><td class="right">      Note: HTTP/1.0 caches might not implement Cache-Control and might</td><td class="lineno" valign="top"></td></tr>
280      <tr><td class="lineno" valign="top"></td><td class="left">      only implement Pragma: no-cache (see Section 3.4).</td><td> </td><td class="right">      only implement Pragma: no-cache (see Section 3.4).</td><td class="lineno" valign="top"></td></tr>
281      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
282      <tr><td class="lineno" valign="top"></td><td class="left">   A proxy, whether or not it implements a cache, MUST pass cache</td><td> </td><td class="right">   A proxy, whether or not it implements a cache, MUST pass cache</td><td class="lineno" valign="top"></td></tr>
283      <tr><td class="lineno" valign="top"></td><td class="left">   directives through in forwarded messages, regardless of their</td><td> </td><td class="right">   directives through in forwarded messages, regardless of their</td><td class="lineno" valign="top"></td></tr>
284      <tr><td class="lineno" valign="top"></td><td class="left">   significance to that application, since the directives might be</td><td> </td><td class="right">   significance to that application, since the directives might be</td><td class="lineno" valign="top"></td></tr>
285      <tr><td class="lineno" valign="top"></td><td class="left">   applicable to all recipients along the request/response chain.  It is</td><td> </td><td class="right">   applicable to all recipients along the request/response chain.  It is</td><td class="lineno" valign="top"></td></tr>
286      <tr><td class="lineno" valign="top"></td><td class="left">   not possible to target a directive to a specific cache.</td><td> </td><td class="right">   not possible to target a directive to a specific cache.</td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
288      <tr><td><a name="diff0014" /></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="lblock">     Cache-Control   = <span class="delete">"Cache-Control" ":" OWS Cache-Control-v</span></td><td> </td><td class="rblock">     Cache-Control   = 1#cache-directive</td><td class="lineno" valign="top"></td></tr>
290      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     Cache-Control-v =</span> 1#cache-directive</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
291      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
292      <tr><td class="lineno" valign="top"></td><td class="left">     cache-directive = cache-request-directive</td><td> </td><td class="right">     cache-directive = cache-request-directive</td><td class="lineno" valign="top"></td></tr>
293      <tr><td class="lineno" valign="top"></td><td class="left">        / cache-response-directive</td><td> </td><td class="right">        / cache-response-directive</td><td class="lineno" valign="top"></td></tr>
294      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
295      <tr><td class="lineno" valign="top"></td><td class="left">     cache-extension = token [ "=" ( token / quoted-string ) ]</td><td> </td><td class="right">     cache-extension = token [ "=" ( token / quoted-string ) ]</td><td class="lineno" valign="top"></td></tr>
296      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="left">3.2.1.  Request Cache-Control Directives</td><td> </td><td class="right">3.2.1.  Request Cache-Control Directives</td><td class="lineno" valign="top"></td></tr>
298      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
299      <tr><td class="lineno" valign="top"></td><td class="left">     cache-request-directive =</td><td> </td><td class="right">     cache-request-directive =</td><td class="lineno" valign="top"></td></tr>
300      <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>
301      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
302      <tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 23, line 13</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 23, line 13</em></th><td></td></tr>
303      <tr><td class="lineno" valign="top"></td><td class="left">      transaction.</td><td> </td><td class="right">      transaction.</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">   proxy-revalidate</td><td> </td><td class="right">   proxy-revalidate</td><td class="lineno" valign="top"></td></tr>
306      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
307      <tr><td class="lineno" valign="top"></td><td class="left">      The proxy-revalidate response directive has the same meaning as</td><td> </td><td class="right">      The proxy-revalidate response directive has the same meaning as</td><td class="lineno" valign="top"></td></tr>
308      <tr><td class="lineno" valign="top"></td><td class="left">      the must-revalidate response directive, except that it does not</td><td> </td><td class="right">      the must-revalidate response directive, except that it does not</td><td class="lineno" valign="top"></td></tr>
309      <tr><td class="lineno" valign="top"></td><td class="left">      apply to private caches.</td><td> </td><td class="right">      apply to private caches.</td><td class="lineno" valign="top"></td></tr>
310      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
311      <tr><td class="lineno" valign="top"></td><td class="left">   max-age</td><td> </td><td class="right">   max-age</td><td class="lineno" valign="top"></td></tr>
312      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
313      <tr><td><a name="diff0015" /></td></tr>
314      <tr><td class="lineno" valign="top"></td><td class="lblock">      The max-age response directive indicates that response is to be</td><td> </td><td class="rblock">      The max-age response directive indicates that <span class="insert">the</span> response is to</td><td class="lineno" valign="top"></td></tr>
315      <tr><td class="lineno" valign="top"></td><td class="lblock">      considered stale after its age is greater than the specified</td><td> </td><td class="rblock">      be considered stale after its age is greater than the specified</td><td class="lineno" valign="top"></td></tr>
316      <tr><td class="lineno" valign="top"></td><td class="left">      number of seconds.</td><td> </td><td class="right">      number of seconds.</td><td class="lineno" valign="top"></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="left">   s-maxage</td><td> </td><td class="right">   s-maxage</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">      The s-maxage response directive indicates that, in shared caches,</td><td> </td><td class="right">      The s-maxage response directive indicates that, in shared caches,</td><td class="lineno" valign="top"></td></tr>
321      <tr><td class="lineno" valign="top"></td><td class="left">      the maximum age specified by this directive overrides the maximum</td><td> </td><td class="right">      the maximum age specified by this directive overrides the maximum</td><td class="lineno" valign="top"></td></tr>
322      <tr><td class="lineno" valign="top"></td><td class="left">      age specified by either the max-age directive or the Expires</td><td> </td><td class="right">      age specified by either the max-age directive or the Expires</td><td class="lineno" valign="top"></td></tr>
323      <tr><td class="lineno" valign="top"></td><td class="left">      header field.  The s-maxage directive also implies the semantics</td><td> </td><td class="right">      header field.  The s-maxage directive also implies the semantics</td><td class="lineno" valign="top"></td></tr>
324      <tr><td class="lineno" valign="top"></td><td class="left">      of the proxy-revalidate response directive.</td><td> </td><td class="right">      of the proxy-revalidate response directive.</td><td class="lineno" valign="top"></td></tr>
325      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
326      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
327      <tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 25, line 6</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 25, line 6</em></th><td></td></tr>
328      <tr><td class="lineno" valign="top"></td><td class="left">   response is considered stale.  See Section 2.3 for further discussion</td><td> </td><td class="right">   response is considered stale.  See Section 2.3 for further discussion</td><td class="lineno" valign="top"></td></tr>
329      <tr><td class="lineno" valign="top"></td><td class="left">   of the freshness model.</td><td> </td><td class="right">   of the freshness model.</td><td class="lineno" valign="top"></td></tr>
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">   The presence of an Expires field does not imply that the original</td><td> </td><td class="right">   The presence of an Expires field does not imply that the original</td><td class="lineno" valign="top"></td></tr>
332      <tr><td class="lineno" valign="top"></td><td class="left">   resource will change or cease to exist at, before, or after that</td><td> </td><td class="right">   resource will change or cease to exist at, before, or after that</td><td class="lineno" valign="top"></td></tr>
333      <tr><td class="lineno" valign="top"></td><td class="left">   time.</td><td> </td><td class="right">   time.</td><td class="lineno" valign="top"></td></tr>
334      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
335      <tr><td class="lineno" valign="top"></td><td class="left">   The field-value is an absolute date and time as defined by HTTP-date</td><td> </td><td class="right">   The field-value is an absolute date and time as defined by HTTP-date</td><td class="lineno" valign="top"></td></tr>
336      <tr><td class="lineno" valign="top"></td><td class="left">   in Section 6.1 of [Part1]; a sender MUST use the rfc1123-date format.</td><td> </td><td class="right">   in Section 6.1 of [Part1]; a sender MUST use the rfc1123-date format.</td><td class="lineno" valign="top"></td></tr>
337      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
338      <tr><td><a name="diff0016" /></td></tr>
339      <tr><td class="lineno" valign="top"></td><td class="lblock">     Expires   = <span class="delete">"Expires" ":" OWS Expires-v</span></td><td> </td><td class="rblock">     Expires = HTTP-date</td><td class="lineno" valign="top"></td></tr>
340      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     Expires-v =</span> HTTP-date</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
341      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
342      <tr><td class="lineno" valign="top"></td><td class="left">   For example</td><td> </td><td class="right">   For example</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">     Expires: Thu, 01 Dec 1994 16:00:00 GMT</td><td> </td><td class="right">     Expires: Thu, 01 Dec 1994 16:00:00 GMT</td><td class="lineno" valign="top"></td></tr>
345      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
346      <tr><td class="lineno" valign="top"></td><td class="left">      Note: If a response includes a Cache-Control field with the max-</td><td> </td><td class="right">      Note: If a response includes a Cache-Control field with the max-</td><td class="lineno" valign="top"></td></tr>
347      <tr><td class="lineno" valign="top"></td><td class="left">      age directive (see Section 3.2.2), that directive overrides the</td><td> </td><td class="right">      age directive (see Section 3.2.2), that directive overrides the</td><td class="lineno" valign="top"></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="left">      Expires field.  Likewise, the s-maxage directive overrides Expires</td><td> </td><td class="right">      Expires field.  Likewise, the s-maxage directive overrides Expires</td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left">      in shared caches.</td><td> </td><td class="right">      in shared caches.</td><td class="lineno" valign="top"></td></tr>
350      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
351      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
352      <tr bgcolor="gray" ><td></td><th><a name="part-l12" /><small>skipping to change at</small><em> page 25, line 32</em></th><th> </th><th><a name="part-r12" /><small>skipping to change at</small><em> page 25, line 31</em></th><td></td></tr>
353      <tr><td class="lineno" valign="top"></td><td class="left">   the value "0", as in the past (i.e., "already expired").</td><td> </td><td class="right">   the value "0", as in the past (i.e., "already expired").</td><td class="lineno" valign="top"></td></tr>
354      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
355      <tr><td class="lineno" valign="top"></td><td class="left">3.4.  Pragma</td><td> </td><td class="right">3.4.  Pragma</td><td class="lineno" valign="top"></td></tr>
356      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
357      <tr><td class="lineno" valign="top"></td><td class="left">   The "Pragma" header field is used to include implementation-specific</td><td> </td><td class="right">   The "Pragma" header field is used to include implementation-specific</td><td class="lineno" valign="top"></td></tr>
358      <tr><td class="lineno" valign="top"></td><td class="left">   directives that might apply to any recipient along the request/</td><td> </td><td class="right">   directives that might apply to any recipient along the request/</td><td class="lineno" valign="top"></td></tr>
359      <tr><td class="lineno" valign="top"></td><td class="left">   response chain.  All pragma directives specify optional behavior from</td><td> </td><td class="right">   response chain.  All pragma directives specify optional behavior from</td><td class="lineno" valign="top"></td></tr>
360      <tr><td class="lineno" valign="top"></td><td class="left">   the viewpoint of the protocol; however, some systems MAY require that</td><td> </td><td class="right">   the viewpoint of the protocol; however, some systems MAY require that</td><td class="lineno" valign="top"></td></tr>
361      <tr><td class="lineno" valign="top"></td><td class="left">   behavior be consistent with the directives.</td><td> </td><td class="right">   behavior be consistent with the directives.</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><a name="diff0017" /></td></tr>
364      <tr><td class="lineno" valign="top"></td><td class="lblock">     Pragma            = <span class="delete">"Pragma" ":" OWS Pragma-v</span></td><td> </td><td class="rblock">     Pragma           = 1#pragma-directive</td><td class="lineno" valign="top"></td></tr>
365      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     Pragma-v          =</span> 1#pragma-directive</td><td> </td><td class="rblock">     pragma-directive = "no-cache" / extension-pragma</td><td class="lineno" valign="top"></td></tr>
366      <tr><td class="lineno" valign="top"></td><td class="lblock">     pragma-directive  = "no-cache" / extension-pragma</td><td> </td><td class="rblock">     extension-pragma = token [ "=" ( token / quoted-string ) ]</td><td class="lineno" valign="top"></td></tr>
367      <tr><td class="lineno" valign="top"></td><td class="lblock">     extension-pragma  = token [ "=" ( token / quoted-string ) ]</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
368      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
369      <tr><td class="lineno" valign="top"></td><td class="left">   When the no-cache directive is present in a request message, a cache</td><td> </td><td class="right">   When the no-cache directive is present in a request message, a cache</td><td class="lineno" valign="top"></td></tr>
370      <tr><td class="lineno" valign="top"></td><td class="left">   SHOULD forward the request toward the origin server even if it has a</td><td> </td><td class="right">   SHOULD forward the request toward the origin server even if it has a</td><td class="lineno" valign="top"></td></tr>
371      <tr><td class="lineno" valign="top"></td><td class="left">   stored copy of what is being requested.  This pragma directive has</td><td> </td><td class="right">   stored copy of what is being requested.  This pragma directive has</td><td class="lineno" valign="top"></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="left">   the same semantics as the no-cache response directive (see</td><td> </td><td class="right">   the same semantics as the no-cache response directive (see</td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="left">   Section 3.2.2) and is defined here for backward compatibility with</td><td> </td><td class="right">   Section 3.2.2) and is defined here for backward compatibility with</td><td class="lineno" valign="top"></td></tr>
374      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP/1.0.  A client SHOULD include both header fields when a no-cache</td><td> </td><td class="right">   HTTP/1.0.  A client SHOULD include both header fields when a no-cache</td><td class="lineno" valign="top"></td></tr>
375      <tr><td class="lineno" valign="top"></td><td class="left">   request is sent to a server not known to be HTTP/1.1 compliant.  A</td><td> </td><td class="right">   request is sent to a server not known to be HTTP/1.1 compliant.  A</td><td class="lineno" valign="top"></td></tr>
376      <tr><td class="lineno" valign="top"></td><td class="left">   cache SHOULD treat "Pragma: no-cache" as if the client had sent</td><td> </td><td class="right">   cache SHOULD treat "Pragma: no-cache" as if the client had sent</td><td class="lineno" valign="top"></td></tr>
377      <tr><td class="lineno" valign="top"></td><td class="left">   "Cache-Control: no-cache".</td><td> </td><td class="right">   "Cache-Control: no-cache".</td><td class="lineno" valign="top"></td></tr>
378      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
379      <tr bgcolor="gray" ><td></td><th><a name="part-l13" /><small>skipping to change at</small><em> page 26, line 21</em></th><th> </th><th><a name="part-r13" /><small>skipping to change at</small><em> page 26, line 20</em></th><td></td></tr>
380      <tr><td class="lineno" valign="top"></td><td class="left">   Caches use this information, in part, to determine whether a stored</td><td> </td><td class="right">   Caches use this information, in part, to determine whether a stored</td><td class="lineno" valign="top"></td></tr>
381      <tr><td class="lineno" valign="top"></td><td class="left">   response can be used to satisfy a given request; see Section 2.7.</td><td> </td><td class="right">   response can be used to satisfy a given request; see Section 2.7.</td><td class="lineno" valign="top"></td></tr>
382      <tr><td class="lineno" valign="top"></td><td class="left">   determines, while the response is fresh, whether a cache is permitted</td><td> </td><td class="right">   determines, while the response is fresh, whether a cache is permitted</td><td class="lineno" valign="top"></td></tr>
383      <tr><td class="lineno" valign="top"></td><td class="left">   to use the response to reply to a subsequent request without</td><td> </td><td class="right">   to use the response to reply to a subsequent request without</td><td class="lineno" valign="top"></td></tr>
384      <tr><td class="lineno" valign="top"></td><td class="left">   validation; see Section 2.7.</td><td> </td><td class="right">   validation; see Section 2.7.</td><td class="lineno" valign="top"></td></tr>
385      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
386      <tr><td class="lineno" valign="top"></td><td class="left">   In uncacheable or stale responses, the Vary field value advises the</td><td> </td><td class="right">   In uncacheable or stale responses, the Vary field value advises the</td><td class="lineno" valign="top"></td></tr>
387      <tr><td class="lineno" valign="top"></td><td class="left">   user agent about the criteria that were used to select the</td><td> </td><td class="right">   user agent about the criteria that were used to select the</td><td class="lineno" valign="top"></td></tr>
388      <tr><td class="lineno" valign="top"></td><td class="left">   representation.</td><td> </td><td class="right">   representation.</td><td class="lineno" valign="top"></td></tr>
389      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
390      <tr><td><a name="diff0018" /></td></tr>
391      <tr><td class="lineno" valign="top"></td><td class="lblock">     Vary   = <span class="delete">"Vary" ":" OWS Vary-v</span></td><td> </td><td class="rblock">     Vary = "*" / 1#field-name</td><td class="lineno" valign="top"></td></tr>
392      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     Vary-v =</span> "*" / 1#field-name</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
393      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
394      <tr><td class="lineno" valign="top"></td><td class="left">   The set of header fields named by the Vary field value is known as</td><td> </td><td class="right">   The set of header fields named by the Vary field value is known as</td><td class="lineno" valign="top"></td></tr>
395      <tr><td class="lineno" valign="top"></td><td class="left">   the selecting header fields.</td><td> </td><td class="right">   the selecting header fields.</td><td class="lineno" valign="top"></td></tr>
396      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
397      <tr><td class="lineno" valign="top"></td><td class="left">   A server SHOULD include a Vary header field with any cacheable</td><td> </td><td class="right">   A server SHOULD include a Vary header field with any cacheable</td><td class="lineno" valign="top"></td></tr>
398      <tr><td class="lineno" valign="top"></td><td class="left">   response that is subject to server-driven negotiation.  Doing so</td><td> </td><td class="right">   response that is subject to server-driven negotiation.  Doing so</td><td class="lineno" valign="top"></td></tr>
399      <tr><td class="lineno" valign="top"></td><td class="left">   allows a cache to properly interpret future requests on that resource</td><td> </td><td class="right">   allows a cache to properly interpret future requests on that resource</td><td class="lineno" valign="top"></td></tr>
400      <tr><td class="lineno" valign="top"></td><td class="left">   and informs the user agent about the presence of negotiation on that</td><td> </td><td class="right">   and informs the user agent about the presence of negotiation on that</td><td class="lineno" valign="top"></td></tr>
401      <tr><td class="lineno" valign="top"></td><td class="left">   resource.  A server MAY include a Vary header field with a non-</td><td> </td><td class="right">   resource.  A server MAY include a Vary header field with a non-</td><td class="lineno" valign="top"></td></tr>
402      <tr><td class="lineno" valign="top"></td><td class="left">   cacheable response that is subject to server-driven negotiation,</td><td> </td><td class="right">   cacheable response that is subject to server-driven negotiation,</td><td class="lineno" valign="top"></td></tr>
403      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
404      <tr bgcolor="gray" ><td></td><th><a name="part-l14" /><small>skipping to change at</small><em> page 27, line 15</em></th><th> </th><th><a name="part-r14" /><small>skipping to change at</small><em> page 27, line 13</em></th><td></td></tr>
405      <tr><td class="lineno" valign="top"></td><td class="left">   transformations applied to the payload of the message.</td><td> </td><td class="right">   transformations applied to the payload of the message.</td><td class="lineno" valign="top"></td></tr>
406      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
407      <tr><td class="lineno" valign="top"></td><td class="left">   Warnings can be used for other purposes, both cache-related and</td><td> </td><td class="right">   Warnings can be used for other purposes, both cache-related and</td><td class="lineno" valign="top"></td></tr>
408      <tr><td class="lineno" valign="top"></td><td class="left">   otherwise.  The use of a warning, rather than an error status code,</td><td> </td><td class="right">   otherwise.  The use of a warning, rather than an error status code,</td><td class="lineno" valign="top"></td></tr>
409      <tr><td class="lineno" valign="top"></td><td class="left">   distinguishes these responses from true failures.</td><td> </td><td class="right">   distinguishes these responses from true failures.</td><td class="lineno" valign="top"></td></tr>
410      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
411      <tr><td class="lineno" valign="top"></td><td class="left">   Warning header fields can in general be applied to any message,</td><td> </td><td class="right">   Warning header fields can in general be applied to any message,</td><td class="lineno" valign="top"></td></tr>
412      <tr><td class="lineno" valign="top"></td><td class="left">   however some warn-codes are specific to caches and can only be</td><td> </td><td class="right">   however some warn-codes are specific to caches and can only be</td><td class="lineno" valign="top"></td></tr>
413      <tr><td class="lineno" valign="top"></td><td class="left">   applied to response messages.</td><td> </td><td class="right">   applied to response messages.</td><td class="lineno" valign="top"></td></tr>
414      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
415      <tr><td><a name="diff0019" /></td></tr>
416      <tr><td class="lineno" valign="top"></td><td class="lblock">     Warning    = <span class="delete">"Warning" ":" OWS Warning-v</span></td><td> </td><td class="rblock">     Warning       = 1#warning-value</td><td class="lineno" valign="top"></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     Warning-v  =</span> 1#warning-value</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
418      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
419      <tr><td class="lineno" valign="top"></td><td class="left">     warning-value = warn-code SP warn-agent SP warn-text</td><td> </td><td class="right">     warning-value = warn-code SP warn-agent SP warn-text</td><td class="lineno" valign="top"></td></tr>
420      <tr><td class="lineno" valign="top"></td><td class="left">                                           [SP warn-date]</td><td> </td><td class="right">                                           [SP warn-date]</td><td class="lineno" valign="top"></td></tr>
421      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
422      <tr><td class="lineno" valign="top"></td><td class="left">     warn-code  = 3DIGIT</td><td> </td><td class="right">     warn-code  = 3DIGIT</td><td class="lineno" valign="top"></td></tr>
423      <tr><td class="lineno" valign="top"></td><td class="left">     warn-agent = ( uri-host [ ":" port ] ) / pseudonym</td><td> </td><td class="right">     warn-agent = ( uri-host [ ":" port ] ) / pseudonym</td><td class="lineno" valign="top"></td></tr>
424      <tr><td class="lineno" valign="top"></td><td class="left">                     ; the name or pseudonym of the server adding</td><td> </td><td class="right">                     ; the name or pseudonym of the server adding</td><td class="lineno" valign="top"></td></tr>
425      <tr><td class="lineno" valign="top"></td><td class="left">                     ; the Warning header field, for use in debugging</td><td> </td><td class="right">                     ; the Warning header field, for use in debugging</td><td class="lineno" valign="top"></td></tr>
426      <tr><td class="lineno" valign="top"></td><td class="left">     warn-text  = quoted-string</td><td> </td><td class="right">     warn-text  = quoted-string</td><td class="lineno" valign="top"></td></tr>
427      <tr><td class="lineno" valign="top"></td><td class="left">     warn-date  = DQUOTE HTTP-date DQUOTE</td><td> </td><td class="right">     warn-date  = DQUOTE HTTP-date DQUOTE</td><td class="lineno" valign="top"></td></tr>
428      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
429      <tr bgcolor="gray" ><td></td><th><a name="part-l15" /><small>skipping to change at</small><em> page 31, line 18</em></th><th> </th><th><a name="part-r15" /><small>skipping to change at</small><em> page 31, line 18</em></th><td></td></tr>
430      <tr><td class="lineno" valign="top"></td><td class="left">   suggestions and comments from individuals including: Shel Kaphan,</td><td> </td><td class="right">   suggestions and comments from individuals including: Shel Kaphan,</td><td class="lineno" valign="top"></td></tr>
431      <tr><td class="lineno" valign="top"></td><td class="left">   Paul Leach, Koen Holtman, David Morris, and Larry Masinter.</td><td> </td><td class="right">   Paul Leach, Koen Holtman, David Morris, and Larry Masinter.</td><td class="lineno" valign="top"></td></tr>
432      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
433      <tr><td class="lineno" valign="top"></td><td class="left">8.  References</td><td> </td><td class="right">8.  References</td><td class="lineno" valign="top"></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="left">8.1.  Normative References</td><td> </td><td class="right">8.1.  Normative References</td><td class="lineno" valign="top"></td></tr>
436      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
437      <tr><td class="lineno" valign="top"></td><td class="left">   [Part1]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part1]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
438      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
439      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,</td><td class="lineno" valign="top"></td></tr>
440      <tr><td><a name="diff0020" /></td></tr>
441      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Message Parsing", <span class="delete">draft-ietf-httpbis-p1-messaging-13</span></td><td> </td><td class="rblock">              and Message Parsing", <span class="insert">draft-ietf-httpbis-p1-messaging-14</span></td><td class="lineno" valign="top"></td></tr>
442      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">March</span> 2011.</td><td> </td><td class="rblock">              (work in progress), <span class="insert">April</span> 2011.</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 class="lineno" valign="top"></td><td class="left">   [Part2]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part2]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
445      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
446      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 2: Message</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 2: Message</td><td class="lineno" valign="top"></td></tr>
447      <tr><td><a name="diff0021" /></td></tr>
448      <tr><td class="lineno" valign="top"></td><td class="lblock">              Semantics", <span class="delete">draft-ietf-httpbis-p2-semantics-13</span> (work in</td><td> </td><td class="rblock">              Semantics", <span class="insert">draft-ietf-httpbis-p2-semantics-14</span> (work in</td><td class="lineno" valign="top"></td></tr>
449      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">March</span> 2011.</td><td> </td><td class="rblock">              progress), <span class="insert">April</span> 2011.</td><td class="lineno" valign="top"></td></tr>
450      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
451      <tr><td class="lineno" valign="top"></td><td class="left">   [Part4]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part4]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
452      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
453      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 4: Conditional</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 4: Conditional</td><td class="lineno" valign="top"></td></tr>
454      <tr><td><a name="diff0022" /></td></tr>
455      <tr><td class="lineno" valign="top"></td><td class="lblock">              Requests", <span class="delete">draft-ietf-httpbis-p4-conditional-13</span> (work in</td><td> </td><td class="rblock">              Requests", <span class="insert">draft-ietf-httpbis-p4-conditional-14</span> (work in</td><td class="lineno" valign="top"></td></tr>
456      <tr><td class="lineno" valign="top"></td><td class="lblock">              progress), <span class="delete">March</span> 2011.</td><td> </td><td class="rblock">              progress), <span class="insert">April</span> 2011.</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">   [Part5]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part5]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
459      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
460      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and</td><td class="lineno" valign="top"></td></tr>
461      <tr><td><a name="diff0023" /></td></tr>
462      <tr><td class="lineno" valign="top"></td><td class="lblock">              Partial Responses", <span class="delete">draft-ietf-httpbis-p5-range-13</span> (work</td><td> </td><td class="rblock">              Partial Responses", <span class="insert">draft-ietf-httpbis-p5-range-14</span> (work</td><td class="lineno" valign="top"></td></tr>
463      <tr><td class="lineno" valign="top"></td><td class="lblock">              in progress), <span class="delete">March</span> 2011.</td><td> </td><td class="rblock">              in progress), <span class="insert">April</span> 2011.</td><td class="lineno" valign="top"></td></tr>
464      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
465      <tr><td class="lineno" valign="top"></td><td class="left">   [Part7]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right">   [Part7]    Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
466      <tr><td class="lineno" valign="top"></td><td class="left">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right">              Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
467      <tr><td class="lineno" valign="top"></td><td class="left">              and J. Reschke, Ed., "HTTP/1.1, part 7: Authentication",</td><td> </td><td class="right">              and J. Reschke, Ed., "HTTP/1.1, part 7: Authentication",</td><td class="lineno" valign="top"></td></tr>
468      <tr><td><a name="diff0024" /></td></tr>
469      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">draft-ietf-httpbis-p7-auth-13</span> (work in progress),</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p7-auth-14</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
470      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">March</span> 2011.</td><td> </td><td class="rblock">              <span class="insert">April</span> 2011.</td><td class="lineno" valign="top"></td></tr>
471      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
472      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate</td><td> </td><td class="right">   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate</td><td class="lineno" valign="top"></td></tr>
473      <tr><td class="lineno" valign="top"></td><td class="left">              Requirement Levels", BCP 14, RFC 2119, March 1997.</td><td> </td><td class="right">              Requirement Levels", BCP 14, RFC 2119, March 1997.</td><td class="lineno" valign="top"></td></tr>
474      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
475      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax</td><td> </td><td class="right">   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax</td><td class="lineno" valign="top"></td></tr>
476      <tr><td class="lineno" valign="top"></td><td class="left">              Specifications: ABNF", STD 68, RFC 5234, January 2008.</td><td> </td><td class="right">              Specifications: ABNF", STD 68, RFC 5234, January 2008.</td><td class="lineno" valign="top"></td></tr>
477      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
478      <tr><td class="lineno" valign="top"></td><td class="left">8.2.  Informative References</td><td> </td><td class="right">8.2.  Informative References</td><td class="lineno" valign="top"></td></tr>
479      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
480      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC1305]  Mills, D., "Network Time Protocol (Version 3)</td><td> </td><td class="right">   [RFC1305]  Mills, D., "Network Time Protocol (Version 3)</td><td class="lineno" valign="top"></td></tr>
481      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
482      <tr bgcolor="gray" ><td></td><th><a name="part-l16" /><small>skipping to change at</small><em> page 32, line 37</em></th><th> </th><th><a name="part-r16" /><small>skipping to change at</small><em> page 32, line 37</em></th><td></td></tr>
483      <tr><td class="lineno" valign="top"></td><td class="left">   Make the specified age calculation algorithm less conservative.</td><td> </td><td class="right">   Make the specified age calculation algorithm less conservative.</td><td class="lineno" valign="top"></td></tr>
484      <tr><td class="lineno" valign="top"></td><td class="left">   (Section 2.3.2)</td><td> </td><td class="right">   (Section 2.3.2)</td><td class="lineno" valign="top"></td></tr>
485      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
486      <tr><td class="lineno" valign="top"></td><td class="left">   Remove requirement to consider Content-Location in successful</td><td> </td><td class="right">   Remove requirement to consider Content-Location in successful</td><td class="lineno" valign="top"></td></tr>
487      <tr><td class="lineno" valign="top"></td><td class="left">   responses in order to determine the appropriate response to use.</td><td> </td><td class="right">   responses in order to determine the appropriate response to use.</td><td class="lineno" valign="top"></td></tr>
488      <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>
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">   Clarify denial of service attack avoidance requirement.</td><td> </td><td class="right">   Clarify denial of service attack avoidance requirement.</td><td class="lineno" valign="top"></td></tr>
491      <tr><td class="lineno" valign="top"></td><td class="left">   (Section 2.5)</td><td> </td><td class="right">   (Section 2.5)</td><td class="lineno" valign="top"></td></tr>
492      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
493      <tr><td><a name="diff0025" /></td></tr>
494      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">Change ABNF productions for header fields to only define the field</span></td><td class="lineno" valign="top"></td></tr>
495      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   value.  (Section 3)</span></td><td class="lineno" valign="top"></td></tr>
496      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
497      <tr><td class="lineno" valign="top"></td><td class="left">   Do not mention RFC 2047 encoding and multiple languages in Warning</td><td> </td><td class="right">   Do not mention RFC 2047 encoding and multiple languages in Warning</td><td class="lineno" valign="top"></td></tr>
498      <tr><td class="lineno" valign="top"></td><td class="left">   header fields anymore, as these aspects never were implemented.</td><td> </td><td class="right">   header fields anymore, as these aspects never were implemented.</td><td class="lineno" valign="top"></td></tr>
499      <tr><td class="lineno" valign="top"></td><td class="left">   (Section 3.6)</td><td> </td><td class="right">   (Section 3.6)</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">Appendix B.  Collected ABNF</td><td> </td><td class="right">Appendix B.  Collected ABNF</td><td class="lineno" valign="top"></td></tr>
502      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
503      <tr><td><a name="diff0026" /></td></tr>
504      <tr><td class="lineno" valign="top"></td><td class="lblock">   Age = <span class="delete">"Age:" OWS Age-v</span></td><td> </td><td class="rblock">   Age = delta-seconds</td><td class="lineno" valign="top"></td></tr>
505      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Age-v =</span> delta-seconds</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
506      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
507      <tr><td><a name="diff0027" /></td></tr>
508      <tr><td class="lineno" valign="top"></td><td class="lblock">   Cache-Control = <span class="delete">"Cache-Control:" OWS Cache-Control-v</span></td><td> </td><td class="rblock">   Cache-Control = *( "," OWS ) cache-directive *( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
509      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Cache-Control-v =</span> *( "," OWS ) cache-directive *( OWS "," [ OWS</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
510      <tr><td class="lineno" valign="top"></td><td class="left">    cache-directive ] )</td><td> </td><td class="right">    cache-directive ] )</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><a name="diff0028" /></td></tr>
513      <tr><td class="lineno" valign="top"></td><td class="lblock">   Expires = <span class="delete">"Expires:" OWS Expires-v</span></td><td> </td><td class="rblock">   Expires = HTTP-date</td><td class="lineno" valign="top"></td></tr>
514      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Expires-v =</span> HTTP-date</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
515      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP-date = &lt;HTTP-date, defined in [Part1], Section 6.1&gt;</td><td> </td><td class="right">   HTTP-date = &lt;HTTP-date, defined in [Part1], Section 6.1&gt;</td><td class="lineno" valign="top"></td></tr>
516      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
517      <tr><td class="lineno" valign="top"></td><td class="left">   OWS = &lt;OWS, defined in [Part1], Section 1.2.2&gt;</td><td> </td><td class="right">   OWS = &lt;OWS, defined in [Part1], Section 1.2.2&gt;</td><td class="lineno" valign="top"></td></tr>
518      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
519      <tr><td><a name="diff0029" /></td></tr>
520      <tr><td class="lineno" valign="top"></td><td class="lblock">   Pragma = <span class="delete">"Pragma:" OWS Pragma-v</span></td><td> </td><td class="rblock">   Pragma = *( "," OWS ) pragma-directive *( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
521      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Pragma-v =</span> *( "," OWS ) pragma-directive *( OWS "," [ OWS</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
522      <tr><td class="lineno" valign="top"></td><td class="left">    pragma-directive ] )</td><td> </td><td class="right">    pragma-directive ] )</td><td class="lineno" valign="top"></td></tr>
523      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
524      <tr><td><a name="diff0030" /></td></tr>
525      <tr><td class="lineno" valign="top"></td><td class="lblock">   Vary = <span class="delete">"Vary:" OWS Vary-v</span></td><td> </td><td class="rblock">   Vary = "*" / ( *( "," OWS ) field-name *( OWS "," [ OWS field-name ]</td><td class="lineno" valign="top"></td></tr>
526      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Vary-v =</span> "*" / ( *( "," OWS ) field-name *( OWS "," [ OWS field-name</td><td> </td><td class="rblock">    ) )</td><td class="lineno" valign="top"></td></tr>
527      <tr><td class="lineno" valign="top"></td><td class="lblock">    ] ) )</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
528      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
529      <tr><td><a name="diff0031" /></td></tr>
530      <tr><td class="lineno" valign="top"></td><td class="lblock">   Warning = <span class="delete">"Warning:" OWS Warning-v</span></td><td> </td><td class="rblock">   Warning = *( "," OWS ) warning-value *( OWS "," [ OWS warning-value ]</td><td class="lineno" valign="top"></td></tr>
531      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Warning-v =</span> *( "," OWS ) warning-value *( OWS "," [ OWS warning-value</td><td> </td><td class="rblock">    )</td><td class="lineno" valign="top"></td></tr>
532      <tr><td class="lineno" valign="top"></td><td class="lblock">    ] )</td><td> </td><td class="rblock"></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">   cache-directive = cache-request-directive / cache-response-directive</td><td> </td><td class="right">   cache-directive = cache-request-directive / cache-response-directive</td><td class="lineno" valign="top"></td></tr>
535      <tr><td class="lineno" valign="top"></td><td class="left">   cache-extension = token [ "=" ( token / quoted-string ) ]</td><td> </td><td class="right">   cache-extension = token [ "=" ( token / quoted-string ) ]</td><td class="lineno" valign="top"></td></tr>
536      <tr><td class="lineno" valign="top"></td><td class="left">   cache-request-directive = "no-cache" / "no-store" / ( "max-age="</td><td> </td><td class="right">   cache-request-directive = "no-cache" / "no-store" / ( "max-age="</td><td class="lineno" valign="top"></td></tr>
537      <tr><td class="lineno" valign="top"></td><td class="left">    delta-seconds ) / ( "max-stale" [ "=" delta-seconds ] ) / (</td><td> </td><td class="right">    delta-seconds ) / ( "max-stale" [ "=" delta-seconds ] ) / (</td><td class="lineno" valign="top"></td></tr>
538      <tr><td class="lineno" valign="top"></td><td class="left">    "min-fresh=" delta-seconds ) / "no-transform" / "only-if-cached" /</td><td> </td><td class="right">    "min-fresh=" delta-seconds ) / "no-transform" / "only-if-cached" /</td><td class="lineno" valign="top"></td></tr>
539      <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>
540      <tr><td class="lineno" valign="top"></td><td class="left">   cache-response-directive = "public" / ( "private" [ "=" DQUOTE *( ","</td><td> </td><td class="right">   cache-response-directive = "public" / ( "private" [ "=" DQUOTE *( ","</td><td class="lineno" valign="top"></td></tr>
541      <tr><td class="lineno" valign="top"></td><td class="left">    OWS ) field-name *( OWS "," [ OWS field-name ] ) DQUOTE ] ) / (</td><td> </td><td class="right">    OWS ) field-name *( OWS "," [ OWS field-name ] ) DQUOTE ] ) / (</td><td class="lineno" valign="top"></td></tr>
542      <tr><td class="lineno" valign="top"></td><td class="left">    "no-cache" [ "=" DQUOTE *( "," OWS ) field-name *( OWS "," [ OWS</td><td> </td><td class="right">    "no-cache" [ "=" DQUOTE *( "," OWS ) field-name *( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
543      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
544      <tr bgcolor="gray" ><td></td><th><a name="part-l17" /><small>skipping to change at</small><em> page 38, line 43</em></th><th> </th><th><a name="part-r17" /><small>skipping to change at</small><em> page 38, line 40</em></th><td></td></tr>
545      <tr><td class="lineno" valign="top"></td><td class="left">C.14.  Since draft-ietf-httpbis-p6-cache-12</td><td> </td><td class="right">C.14.  Since draft-ietf-httpbis-p6-cache-12</td><td class="lineno" valign="top"></td></tr>
546      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
547      <tr><td class="lineno" valign="top"></td><td class="left">   Closed issues:</td><td> </td><td class="right">   Closed issues:</td><td class="lineno" valign="top"></td></tr>
548      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
549      <tr><td class="lineno" valign="top"></td><td class="left">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/224&gt;: "Header</td><td> </td><td class="right">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/224&gt;: "Header</td><td class="lineno" valign="top"></td></tr>
550      <tr><td class="lineno" valign="top"></td><td class="left">      Classification"</td><td> </td><td class="right">      Classification"</td><td class="lineno" valign="top"></td></tr>
551      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
552      <tr><td class="lineno" valign="top"></td><td class="left">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/268&gt;: "Clarify</td><td> </td><td class="right">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/268&gt;: "Clarify</td><td class="lineno" valign="top"></td></tr>
553      <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>
554      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
555      <tr><td><a name="diff0032" /></td></tr>
556      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">C.15.  Since draft-ietf-httpbis-p6-cache-13</span></td><td class="lineno" valign="top"></td></tr>
557      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
558      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Closed issues:</span></td><td class="lineno" valign="top"></td></tr>
559      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
560      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/276&gt;: "untangle</span></td><td class="lineno" valign="top"></td></tr>
561      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      ABNFs for header fields"</span></td><td class="lineno" valign="top"></td></tr>
562      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
563      <tr><td class="lineno" valign="top"></td><td class="left">Index</td><td> </td><td class="right">Index</td><td class="lineno" valign="top"></td></tr>
564      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
565      <tr><td class="lineno" valign="top"></td><td class="left">   A</td><td> </td><td class="right">   A</td><td class="lineno" valign="top"></td></tr>
566      <tr><td class="lineno" valign="top"></td><td class="left">      age  6</td><td> </td><td class="right">      age  6</td><td class="lineno" valign="top"></td></tr>
567      <tr><td class="lineno" valign="top"></td><td class="left">      Age header field  18</td><td> </td><td class="right">      Age header field  18</td><td class="lineno" valign="top"></td></tr>
568      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
569      <tr><td class="lineno" valign="top"></td><td class="left">   C</td><td> </td><td class="right">   C</td><td class="lineno" valign="top"></td></tr>
570      <tr><td class="lineno" valign="top"></td><td class="left">      cache  5</td><td> </td><td class="right">      cache  5</td><td class="lineno" valign="top"></td></tr>
571      <tr><td class="lineno" valign="top"></td><td class="left">      Cache Directives</td><td> </td><td class="right">      Cache Directives</td><td class="lineno" valign="top"></td></tr>
572      <tr><td><a name="diff0033" /></td></tr>
573      <tr><td class="lineno" valign="top"></td><td class="lblock">         max-age  <span class="delete">20</span>, 23</td><td> </td><td class="rblock">         max-age  <span class="insert">19</span>, 23</td><td class="lineno" valign="top"></td></tr>
574      <tr><td class="lineno" valign="top"></td><td class="left">         max-stale  20</td><td> </td><td class="right">         max-stale  20</td><td class="lineno" valign="top"></td></tr>
575      <tr><td class="lineno" valign="top"></td><td class="left">         min-fresh  20</td><td> </td><td class="right">         min-fresh  20</td><td class="lineno" valign="top"></td></tr>
576      <tr><td class="lineno" valign="top"></td><td class="left">         must-revalidate  22</td><td> </td><td class="right">         must-revalidate  22</td><td class="lineno" valign="top"></td></tr>
577      <tr><td class="lineno" valign="top"></td><td class="left">         no-cache  19, 21</td><td> </td><td class="right">         no-cache  19, 21</td><td class="lineno" valign="top"></td></tr>
578      <tr><td class="lineno" valign="top"></td><td class="left">         no-store  19, 22</td><td> </td><td class="right">         no-store  19, 22</td><td class="lineno" valign="top"></td></tr>
579      <tr><td class="lineno" valign="top"></td><td class="left">         no-transform  20, 23</td><td> </td><td class="right">         no-transform  20, 23</td><td class="lineno" valign="top"></td></tr>
580      <tr><td class="lineno" valign="top"></td><td class="left">         only-if-cached  20</td><td> </td><td class="right">         only-if-cached  20</td><td class="lineno" valign="top"></td></tr>
581      <tr><td class="lineno" valign="top"></td><td class="left">         private  21</td><td> </td><td class="right">         private  21</td><td class="lineno" valign="top"></td></tr>
582      <tr><td class="lineno" valign="top"></td><td class="left">         proxy-revalidate  23</td><td> </td><td class="right">         proxy-revalidate  23</td><td class="lineno" valign="top"></td></tr>
583      <tr><td class="lineno" valign="top"></td><td class="left">         public  21</td><td> </td><td class="right">         public  21</td><td class="lineno" valign="top"></td></tr>
584      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
585      <tr bgcolor="gray" ><td></td><th><a name="part-l18" /><small>skipping to change at</small><em> page 39, line 30</em></th><th> </th><th><a name="part-r18" /><small>skipping to change at</small><em> page 39, line 35</em></th><td></td></tr>
586      <tr><td class="lineno" valign="top"></td><td class="left">      explicit expiration time  6</td><td> </td><td class="right">      explicit expiration time  6</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 class="lineno" valign="top"></td><td class="left">   F</td><td> </td><td class="right">   F</td><td class="lineno" valign="top"></td></tr>
589      <tr><td class="lineno" valign="top"></td><td class="left">      first-hand  6</td><td> </td><td class="right">      first-hand  6</td><td class="lineno" valign="top"></td></tr>
590      <tr><td class="lineno" valign="top"></td><td class="left">      fresh  6</td><td> </td><td class="right">      fresh  6</td><td class="lineno" valign="top"></td></tr>
591      <tr><td class="lineno" valign="top"></td><td class="left">      freshness lifetime  6</td><td> </td><td class="right">      freshness lifetime  6</td><td class="lineno" valign="top"></td></tr>
592      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
593      <tr><td class="lineno" valign="top"></td><td class="left">   G</td><td> </td><td class="right">   G</td><td class="lineno" valign="top"></td></tr>
594      <tr><td class="lineno" valign="top"></td><td class="left">      Grammar</td><td> </td><td class="right">      Grammar</td><td class="lineno" valign="top"></td></tr>
595      <tr><td class="lineno" valign="top"></td><td class="left">         Age  18</td><td> </td><td class="right">         Age  18</td><td class="lineno" valign="top"></td></tr>
596      <tr><td><a name="diff0034" /></td></tr>
597      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         Age-v  18</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
598      <tr><td class="lineno" valign="top"></td><td class="left">         Cache-Control  19</td><td> </td><td class="right">         Cache-Control  19</td><td class="lineno" valign="top"></td></tr>
599      <tr><td><a name="diff0035" /></td></tr>
600      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         Cache-Control-v  19</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
601      <tr><td class="lineno" valign="top"></td><td class="left">         cache-extension  19</td><td> </td><td class="right">         cache-extension  19</td><td class="lineno" valign="top"></td></tr>
602      <tr><td class="lineno" valign="top"></td><td class="left">         cache-request-directive  19</td><td> </td><td class="right">         cache-request-directive  19</td><td class="lineno" valign="top"></td></tr>
603      <tr><td class="lineno" valign="top"></td><td class="left">         cache-response-directive  21</td><td> </td><td class="right">         cache-response-directive  21</td><td class="lineno" valign="top"></td></tr>
604      <tr><td class="lineno" valign="top"></td><td class="left">         delta-seconds  18</td><td> </td><td class="right">         delta-seconds  18</td><td class="lineno" valign="top"></td></tr>
605      <tr><td class="lineno" valign="top"></td><td class="left">         Expires  25</td><td> </td><td class="right">         Expires  25</td><td class="lineno" valign="top"></td></tr>
606      <tr><td><a name="diff0036" /></td></tr>
607      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         Expires-v  25</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
608      <tr><td class="lineno" valign="top"></td><td class="left">         extension-pragma  25</td><td> </td><td class="right">         extension-pragma  25</td><td class="lineno" valign="top"></td></tr>
609      <tr><td class="lineno" valign="top"></td><td class="left">         Pragma  25</td><td> </td><td class="right">         Pragma  25</td><td class="lineno" valign="top"></td></tr>
610      <tr><td class="lineno" valign="top"></td><td class="left">         pragma-directive  25</td><td> </td><td class="right">         pragma-directive  25</td><td class="lineno" valign="top"></td></tr>
611      <tr><td><a name="diff0037" /></td></tr>
612      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         Pragma-v  25</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
613      <tr><td class="lineno" valign="top"></td><td class="left">         Vary  26</td><td> </td><td class="right">         Vary  26</td><td class="lineno" valign="top"></td></tr>
614      <tr><td><a name="diff0038" /></td></tr>
615      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         Vary-v  26</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
616      <tr><td class="lineno" valign="top"></td><td class="left">         warn-agent  27</td><td> </td><td class="right">         warn-agent  27</td><td class="lineno" valign="top"></td></tr>
617      <tr><td class="lineno" valign="top"></td><td class="left">         warn-code  27</td><td> </td><td class="right">         warn-code  27</td><td class="lineno" valign="top"></td></tr>
618      <tr><td class="lineno" valign="top"></td><td class="left">         warn-date  27</td><td> </td><td class="right">         warn-date  27</td><td class="lineno" valign="top"></td></tr>
619      <tr><td class="lineno" valign="top"></td><td class="left">         warn-text  27</td><td> </td><td class="right">         warn-text  27</td><td class="lineno" valign="top"></td></tr>
620      <tr><td class="lineno" valign="top"></td><td class="left">         Warning  27</td><td> </td><td class="right">         Warning  27</td><td class="lineno" valign="top"></td></tr>
621      <tr><td><a name="diff0039" /></td></tr>
622      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">         Warning-v  27</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
623      <tr><td class="lineno" valign="top"></td><td class="left">         warning-value  27</td><td> </td><td class="right">         warning-value  27</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 class="lineno" valign="top"></td><td class="left">   H</td><td> </td><td class="right">   H</td><td class="lineno" valign="top"></td></tr>
626      <tr><td class="lineno" valign="top"></td><td class="left">      Header Fields</td><td> </td><td class="right">      Header Fields</td><td class="lineno" valign="top"></td></tr>
627      <tr><td class="lineno" valign="top"></td><td class="left">         Age  18</td><td> </td><td class="right">         Age  18</td><td class="lineno" valign="top"></td></tr>
628      <tr><td class="lineno" valign="top"></td><td class="left">         Cache-Control  18</td><td> </td><td class="right">         Cache-Control  18</td><td class="lineno" valign="top"></td></tr>
629      <tr><td class="lineno" valign="top"></td><td class="left">         Expires  24</td><td> </td><td class="right">         Expires  24</td><td class="lineno" valign="top"></td></tr>
630      <tr><td class="lineno" valign="top"></td><td class="left">         Pragma  25</td><td> </td><td class="right">         Pragma  25</td><td class="lineno" valign="top"></td></tr>
631      <tr><td class="lineno" valign="top"></td><td class="left">         Vary  26</td><td> </td><td class="right">         Vary  26</td><td class="lineno" valign="top"></td></tr>
632      <tr><td class="lineno" valign="top"></td><td class="left">         Warning  26</td><td> </td><td class="right">         Warning  26</td><td class="lineno" valign="top"></td></tr>
633      <tr><td class="lineno" valign="top"></td><td class="left">      heuristic expiration time  6</td><td> </td><td class="right">      heuristic expiration time  6</td><td class="lineno" valign="top"></td></tr>
634      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
635      <tr><td class="lineno" valign="top"></td><td class="left">   M</td><td> </td><td class="right">   M</td><td class="lineno" valign="top"></td></tr>
636      <tr><td class="lineno" valign="top"></td><td class="left">      max-age</td><td> </td><td class="right">      max-age</td><td class="lineno" valign="top"></td></tr>
637      <tr><td><a name="diff0040" /></td></tr>
638      <tr><td class="lineno" valign="top"></td><td class="lblock">         Cache Directive  <span class="delete">20</span>, 23</td><td> </td><td class="rblock">         Cache Directive  <span class="insert">19</span>, 23</td><td class="lineno" valign="top"></td></tr>
639      <tr><td class="lineno" valign="top"></td><td class="left">      max-stale</td><td> </td><td class="right">      max-stale</td><td class="lineno" valign="top"></td></tr>
640      <tr><td class="lineno" valign="top"></td><td class="left">         Cache Directive  20</td><td> </td><td class="right">         Cache Directive  20</td><td class="lineno" valign="top"></td></tr>
641      <tr><td class="lineno" valign="top"></td><td class="left">      min-fresh</td><td> </td><td class="right">      min-fresh</td><td class="lineno" valign="top"></td></tr>
642      <tr><td class="lineno" valign="top"></td><td class="left">         Cache Directive  20</td><td> </td><td class="right">         Cache Directive  20</td><td class="lineno" valign="top"></td></tr>
643      <tr><td class="lineno" valign="top"></td><td class="left">      must-revalidate</td><td> </td><td class="right">      must-revalidate</td><td class="lineno" valign="top"></td></tr>
644      <tr><td class="lineno" valign="top"></td><td class="left">         Cache Directive  22</td><td> </td><td class="right">         Cache Directive  22</td><td class="lineno" valign="top"></td></tr>
645      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
646      <tr><td class="lineno" valign="top"></td><td class="left">   N</td><td> </td><td class="right">   N</td><td class="lineno" valign="top"></td></tr>
647      <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>
648      <tr><td class="lineno" valign="top"></td><td class="left">         Cache Directive  19, 21</td><td> </td><td class="right">         Cache Directive  19, 21</td><td class="lineno" valign="top"></td></tr>
649
650     <tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
651     <tr bgcolor="gray"><th colspan="5" align="center"><a name="end">&nbsp;End of changes. 40 change blocks.&nbsp;</a></th></tr>
652     <tr class="stats"><td></td><th><i>60 lines changed or deleted</i></th><th><i> </i></th><th><i>57 lines changed or added</i></th><td></td></tr>
653     <tr><td colspan="5" align="center" class="small"><br/>This html diff was produced by rfcdiff 1.38. The latest version is available from <a href="http://www.tools.ietf.org/tools/rfcdiff/" >http://tools.ietf.org/tools/rfcdiff/</a> </td></tr>
654   </table>
655   </body>
656   </html>
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