source: draft-ietf-httpbis/diffs/draft-ietf-httpbis-p6-cache-11-from-10.diff.html @ 1697

Last change on this file since 1697 was 974, checked in by julian.reschke@…, 9 years ago

fix dodiff so it generates proper filesnames (not using the rfcdiff default anymore)

  • Property svn:eol-style set to native
  • Property svn:mime-type set to text/html; charset=iso-8859-1
File size: 251.9 KB
Line 
1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
2<!-- Generated by rfcdiff 1.38: rfcdiff  --> 
3<!-- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional" > -->
4<html> 
5<head> 
6  <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> 
7  <meta http-equiv="Content-Style-Type" content="text/css" /> 
8  <title>Diff: draft-ietf-httpbis-p6-cache-10.txt - draft-ietf-httpbis-p6-cache-11.txt</title> 
9  <style type="text/css"> 
10    body    { margin: 0.4ex; margin-right: auto; } 
11    tr      { } 
12    td      { white-space: pre; font-family: monospace; vertical-align: top; font-size: 0.86em;} 
13    th      { font-size: 0.86em; } 
14    .small  { font-size: 0.6em; font-style: italic; font-family: Verdana, Helvetica, sans-serif; } 
15    .left   { background-color: #EEE; } 
16    .right  { background-color: #FFF; } 
17    .diff   { background-color: #CCF; } 
18    .lblock { background-color: #BFB; } 
19    .rblock { background-color: #FF8; } 
20    .insert { background-color: #8FF; } 
21    .delete { background-color: #ACF; } 
22    .void   { background-color: #FFB; } 
23    .cont   { background-color: #EEE; } 
24    .linebr { background-color: #AAA; } 
25    .lineno { color: red; background-color: #FFF; font-size: 0.7em; text-align: right; padding: 0 2px; } 
26    .elipsis{ background-color: #AAA; } 
27    .left .cont { background-color: #DDD; } 
28    .right .cont { background-color: #EEE; } 
29    .lblock .cont { background-color: #9D9; } 
30    .rblock .cont { background-color: #DD6; } 
31    .insert .cont { background-color: #0DD; } 
32    .delete .cont { background-color: #8AD; } 
33    .stats, .stats td, .stats th { background-color: #EEE; padding: 2px 0; } 
34  </style> 
35</head> 
36<body > 
37  <table border="0" cellpadding="0" cellspacing="0"> 
38  <tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p6-cache-10.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p6-cache-11.txt&nbsp;</th><th></th></tr> 
39      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
40      <tr><td class="lineno" valign="top"></td><td class="left">HTTPbis Working Group                                   R. Fielding, Ed.</td><td> </td><td class="right">HTTPbis Working Group                                   R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
41      <tr><td class="lineno" valign="top"></td><td class="left">Internet-Draft                                              Day Software</td><td> </td><td class="right">Internet-Draft                                              Day Software</td><td class="lineno" valign="top"></td></tr>
42      <tr><td class="lineno" valign="top"></td><td class="left">Obsoletes: 2616 (if approved)                                  J. Gettys</td><td> </td><td class="right">Obsoletes: 2616 (if approved)                                  J. Gettys</td><td class="lineno" valign="top"></td></tr>
43      <tr><td class="lineno" valign="top"></td><td class="left">Intended status: Standards Track                          Alcatel-Lucent</td><td> </td><td class="right">Intended status: Standards Track                          Alcatel-Lucent</td><td class="lineno" valign="top"></td></tr>
44      <tr><td><a name="diff0001" /></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">January 13</span>, 2011                                       J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">February 5</span>, 2011                                       J. Mogul</td><td class="lineno" valign="top"></td></tr>
46      <tr><td class="lineno" valign="top"></td><td class="left">                                                                      HP</td><td> </td><td class="right">                                                                      HP</td><td class="lineno" valign="top"></td></tr>
47      <tr><td class="lineno" valign="top"></td><td class="left">                                                              H. Frystyk</td><td> </td><td class="right">                                                              H. Frystyk</td><td class="lineno" valign="top"></td></tr>
48      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
49      <tr><td class="lineno" valign="top"></td><td class="left">                                                             L. Masinter</td><td> </td><td class="right">                                                             L. Masinter</td><td class="lineno" valign="top"></td></tr>
50      <tr><td class="lineno" valign="top"></td><td class="left">                                                           Adobe Systems</td><td> </td><td class="right">                                                           Adobe Systems</td><td class="lineno" valign="top"></td></tr>
51      <tr><td class="lineno" valign="top"></td><td class="left">                                                                P. Leach</td><td> </td><td class="right">                                                                P. Leach</td><td class="lineno" valign="top"></td></tr>
52      <tr><td class="lineno" valign="top"></td><td class="left">                                                               Microsoft</td><td> </td><td class="right">                                                               Microsoft</td><td class="lineno" valign="top"></td></tr>
53      <tr><td class="lineno" valign="top"></td><td class="left">                                                          T. Berners-Lee</td><td> </td><td class="right">                                                          T. Berners-Lee</td><td class="lineno" valign="top"></td></tr>
54      <tr><td class="lineno" valign="top"></td><td class="left">                                                                 W3C/MIT</td><td> </td><td class="right">                                                                 W3C/MIT</td><td class="lineno" valign="top"></td></tr>
55      <tr><td class="lineno" valign="top"></td><td class="left">                                                           Y. Lafon, Ed.</td><td> </td><td class="right">                                                           Y. Lafon, Ed.</td><td class="lineno" valign="top"></td></tr>
56      <tr><td class="lineno" valign="top"></td><td class="left">                                                                     W3C</td><td> </td><td class="right">                                                                     W3C</td><td class="lineno" valign="top"></td></tr>
57      <tr><td class="lineno" valign="top"></td><td class="left">                                                      M. Nottingham, Ed.</td><td> </td><td class="right">                                                      M. Nottingham, Ed.</td><td class="lineno" valign="top"></td></tr>
58      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
59      <tr><td class="lineno" valign="top"></td><td class="left">                                                         J. Reschke, Ed.</td><td> </td><td class="right">                                                         J. Reschke, Ed.</td><td class="lineno" valign="top"></td></tr>
60      <tr><td class="lineno" valign="top"></td><td class="left">                                                              greenbytes</td><td> </td><td class="right">                                                              greenbytes</td><td class="lineno" valign="top"></td></tr>
61      <tr><td><a name="diff0002" /></td></tr>
62      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                          <span class="delete"> July 12</span>, 2010</td><td> </td><td class="rblock">                                                          <span class="insert">August 4</span>, 2010</td><td class="lineno" valign="top"></td></tr>
63      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
64      <tr><td class="lineno" valign="top"></td><td class="left">                       HTTP/1.1, part 6: Caching</td><td> </td><td class="right">                       HTTP/1.1, part 6: Caching</td><td class="lineno" valign="top"></td></tr>
65      <tr><td><a name="diff0003" /></td></tr>
66      <tr><td class="lineno" valign="top"></td><td class="lblock">                     draft-ietf-httpbis-p6-cache-1<span class="delete">0</span></td><td> </td><td class="rblock">                     draft-ietf-httpbis-p6-cache-1<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
67      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
68      <tr><td class="lineno" valign="top"></td><td class="left">Abstract</td><td> </td><td class="right">Abstract</td><td class="lineno" valign="top"></td></tr>
69      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
70      <tr><td class="lineno" valign="top"></td><td class="left">   The Hypertext Transfer Protocol (HTTP) is an application-level</td><td> </td><td class="right">   The Hypertext Transfer Protocol (HTTP) is an application-level</td><td class="lineno" valign="top"></td></tr>
71      <tr><td class="lineno" valign="top"></td><td class="left">   protocol for distributed, collaborative, hypermedia information</td><td> </td><td class="right">   protocol for distributed, collaborative, hypermedia information</td><td class="lineno" valign="top"></td></tr>
72      <tr><td class="lineno" valign="top"></td><td class="left">   systems.  This document is Part 6 of the seven-part specification</td><td> </td><td class="right">   systems.  This document is Part 6 of the seven-part specification</td><td class="lineno" valign="top"></td></tr>
73      <tr><td class="lineno" valign="top"></td><td class="left">   that defines the protocol referred to as "HTTP/1.1" and, taken</td><td> </td><td class="right">   that defines the protocol referred to as "HTTP/1.1" and, taken</td><td class="lineno" valign="top"></td></tr>
74      <tr><td class="lineno" valign="top"></td><td class="left">   together, obsoletes RFC 2616.  Part 6 defines requirements on HTTP</td><td> </td><td class="right">   together, obsoletes RFC 2616.  Part 6 defines requirements on HTTP</td><td class="lineno" valign="top"></td></tr>
75      <tr><td class="lineno" valign="top"></td><td class="left">   caches and the associated header fields that control cache behavior</td><td> </td><td class="right">   caches and the associated header fields that control cache behavior</td><td class="lineno" valign="top"></td></tr>
76      <tr><td class="lineno" valign="top"></td><td class="left">   or indicate cacheable response messages.</td><td> </td><td class="right">   or indicate cacheable response messages.</td><td class="lineno" valign="top"></td></tr>
77      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
78      <tr><td class="lineno" valign="top"></td><td class="left">Editorial Note (To be removed by RFC Editor)</td><td> </td><td class="right">Editorial Note (To be removed by RFC Editor)</td><td class="lineno" valign="top"></td></tr>
79      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
80      <tr><td class="lineno" valign="top"></td><td class="left">   Discussion of this draft should take place on the HTTPBIS working</td><td> </td><td class="right">   Discussion of this draft should take place on the HTTPBIS working</td><td class="lineno" valign="top"></td></tr>
81      <tr><td class="lineno" valign="top"></td><td class="left">   group mailing list (ietf-http-wg@w3.org).  The current issues list is</td><td> </td><td class="right">   group mailing list (ietf-http-wg@w3.org).  The current issues list is</td><td class="lineno" valign="top"></td></tr>
82      <tr><td class="lineno" valign="top"></td><td class="left">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td> </td><td class="right">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td class="lineno" valign="top"></td></tr>
83      <tr><td class="lineno" valign="top"></td><td class="left">   documents (including fancy diffs) can be found at</td><td> </td><td class="right">   documents (including fancy diffs) can be found at</td><td class="lineno" valign="top"></td></tr>
84      <tr><td class="lineno" valign="top"></td><td class="left">   &lt;http://tools.ietf.org/wg/httpbis/&gt;.</td><td> </td><td class="right">   &lt;http://tools.ietf.org/wg/httpbis/&gt;.</td><td class="lineno" valign="top"></td></tr>
85      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
86      <tr><td><a name="diff0004" /></td></tr>
87      <tr><td class="lineno" valign="top"></td><td class="lblock">   The changes in this draft are summarized in Appendix C.1<span class="delete">1</span>.</td><td> </td><td class="rblock">   The changes in this draft are summarized in Appendix C.1<span class="insert">2</span>.</td><td class="lineno" valign="top"></td></tr>
88      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
89      <tr><td class="lineno" valign="top"></td><td class="left">Status of This Memo</td><td> </td><td class="right">Status of This Memo</td><td class="lineno" valign="top"></td></tr>
90      <tr><td class="lineno" valign="top"></td><td class="left">   This Internet-Draft is submitted in full conformance with the</td><td> </td><td class="right">   This Internet-Draft is submitted in full conformance with the</td><td class="lineno" valign="top"></td></tr>
91      <tr><td class="lineno" valign="top"></td><td class="left">   provisions of BCP 78 and BCP 79.</td><td> </td><td class="right">   provisions of BCP 78 and BCP 79.</td><td class="lineno" valign="top"></td></tr>
92      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
93      <tr><td class="lineno" valign="top"></td><td class="left">   Internet-Drafts are working documents of the Internet Engineering</td><td> </td><td class="right">   Internet-Drafts are working documents of the Internet Engineering</td><td class="lineno" valign="top"></td></tr>
94      <tr><td class="lineno" valign="top"></td><td class="left">   Task Force (IETF).  Note that other groups may also distribute</td><td> </td><td class="right">   Task Force (IETF).  Note that other groups may also distribute</td><td class="lineno" valign="top"></td></tr>
95      <tr><td class="lineno" valign="top"></td><td class="left">   working documents as Internet-Drafts.  The list of current Internet-</td><td> </td><td class="right">   working documents as Internet-Drafts.  The list of current Internet-</td><td class="lineno" valign="top"></td></tr>
96      <tr><td class="lineno" valign="top"></td><td class="left">   Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td> </td><td class="right">   Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td class="lineno" valign="top"></td></tr>
97      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
98      <tr><td class="lineno" valign="top"></td><td class="left">   Internet-Drafts are draft documents valid for a maximum of six months</td><td> </td><td class="right">   Internet-Drafts are draft documents valid for a maximum of six months</td><td class="lineno" valign="top"></td></tr>
99      <tr><td class="lineno" valign="top"></td><td class="left">   and may be updated, replaced, or obsoleted by other documents at any</td><td> </td><td class="right">   and may be updated, replaced, or obsoleted by other documents at any</td><td class="lineno" valign="top"></td></tr>
100      <tr><td class="lineno" valign="top"></td><td class="left">   time.  It is inappropriate to use Internet-Drafts as reference</td><td> </td><td class="right">   time.  It is inappropriate to use Internet-Drafts as reference</td><td class="lineno" valign="top"></td></tr>
101      <tr><td class="lineno" valign="top"></td><td class="left">   material or to cite them other than as "work in progress."</td><td> </td><td class="right">   material or to cite them other than as "work in progress."</td><td class="lineno" valign="top"></td></tr>
102      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
103      <tr><td><a name="diff0005" /></td></tr>
104      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on <span class="delete">January 13</span>, 2011.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">February 5</span>, 2011.</td><td class="lineno" valign="top"></td></tr>
105      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
106      <tr><td class="lineno" valign="top"></td><td class="left">Copyright Notice</td><td> </td><td class="right">Copyright Notice</td><td class="lineno" valign="top"></td></tr>
107      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
108      <tr><td class="lineno" valign="top"></td><td class="left">   Copyright (c) 2010 IETF Trust and the persons identified as the</td><td> </td><td class="right">   Copyright (c) 2010 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
109      <tr><td class="lineno" valign="top"></td><td class="left">   document authors.  All rights reserved.</td><td> </td><td class="right">   document authors.  All rights reserved.</td><td class="lineno" valign="top"></td></tr>
110      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
111      <tr><td class="lineno" valign="top"></td><td class="left">   This document is subject to BCP 78 and the IETF Trust's Legal</td><td> </td><td class="right">   This document is subject to BCP 78 and the IETF Trust's Legal</td><td class="lineno" valign="top"></td></tr>
112      <tr><td class="lineno" valign="top"></td><td class="left">   Provisions Relating to IETF Documents</td><td> </td><td class="right">   Provisions Relating to IETF Documents</td><td class="lineno" valign="top"></td></tr>
113      <tr><td class="lineno" valign="top"></td><td class="left">   (http://trustee.ietf.org/license-info) in effect on the date of</td><td> </td><td class="right">   (http://trustee.ietf.org/license-info) in effect on the date of</td><td class="lineno" valign="top"></td></tr>
114      <tr><td class="lineno" valign="top"></td><td class="left">   publication of this document.  Please review these documents</td><td> </td><td class="right">   publication of this document.  Please review these documents</td><td class="lineno" valign="top"></td></tr>
115      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
116      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 3, line 24</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 3, line 24</em></th><td></td></tr>
117      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.2.  Calculating Age  . . . . . . . . . . . . . . . . . . . 12</td><td> </td><td class="right">       2.3.2.  Calculating Age  . . . . . . . . . . . . . . . . . . . 12</td><td class="lineno" valign="top"></td></tr>
118      <tr><td class="lineno" valign="top"></td><td class="left">       2.3.3.  Serving Stale Responses  . . . . . . . . . . . . . . . 13</td><td> </td><td class="right">       2.3.3.  Serving Stale Responses  . . . . . . . . . . . . . . . 13</td><td class="lineno" valign="top"></td></tr>
119      <tr><td class="lineno" valign="top"></td><td class="left">     2.4.  Validation Model . . . . . . . . . . . . . . . . . . . . . 14</td><td> </td><td class="right">     2.4.  Validation Model . . . . . . . . . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
120      <tr><td class="lineno" valign="top"></td><td class="left">     2.5.  Request Methods that Invalidate  . . . . . . . . . . . . . 14</td><td> </td><td class="right">     2.5.  Request Methods that Invalidate  . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
121      <tr><td class="lineno" valign="top"></td><td class="left">     2.6.  Shared Caching of Authenticated Responses  . . . . . . . . 15</td><td> </td><td class="right">     2.6.  Shared Caching of Authenticated Responses  . . . . . . . . 15</td><td class="lineno" valign="top"></td></tr>
122      <tr><td class="lineno" valign="top"></td><td class="left">     2.7.  Caching Negotiated Responses . . . . . . . . . . . . . . . 16</td><td> </td><td class="right">     2.7.  Caching Negotiated Responses . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="left">     2.8.  Combining Responses  . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="right">     2.8.  Combining Responses  . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
124      <tr><td class="lineno" valign="top"></td><td class="left">   3.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">   3.  Header Field Definitions . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
125      <tr><td class="lineno" valign="top"></td><td class="left">     3.1.  Age  . . . . . . . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right">     3.1.  Age  . . . . . . . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
126      <tr><td class="lineno" valign="top"></td><td class="left">     3.2.  Cache-Control  . . . . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right">     3.2.  Cache-Control  . . . . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
127      <tr><td><a name="diff0006" /></td></tr>
128      <tr><td class="lineno" valign="top"></td><td class="lblock">       3.2.1.  Request Cache-Control Directives . . . . . . . . . . . 1<span class="delete">9</span></td><td> </td><td class="rblock">       3.2.1.  Request Cache-Control Directives . . . . . . . . . . . 1<span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
129      <tr><td class="lineno" valign="top"></td><td class="left">       3.2.2.  Response Cache-Control Directives  . . . . . . . . . . 20</td><td> </td><td class="right">       3.2.2.  Response Cache-Control Directives  . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
130      <tr><td><a name="diff0007" /></td></tr>
131      <tr><td class="lineno" valign="top"></td><td class="lblock">       3.2.3.  Cache Control Extensions . . . . . . . . . . . . . . . 2<span class="delete">3</span></td><td> </td><td class="rblock">       3.2.3.  Cache Control Extensions . . . . . . . . . . . . . . . 2<span class="insert">2</span></td><td class="lineno" valign="top"></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="left">     3.3.  Expires  . . . . . . . . . . . . . . . . . . . . . . . . . 24</td><td> </td><td class="right">     3.3.  Expires  . . . . . . . . . . . . . . . . . . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
133      <tr><td><a name="diff0008" /></td></tr>
134      <tr><td class="lineno" valign="top"></td><td class="lblock">     3.4.  Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 2<span class="delete">5</span></td><td> </td><td class="rblock">     3.4.  Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 2<span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
135      <tr><td class="lineno" valign="top"></td><td class="left">     3.5.  Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td> </td><td class="right">     3.5.  Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td class="lineno" valign="top"></td></tr>
136      <tr><td class="lineno" valign="top"></td><td class="left">     3.6.  Warning  . . . . . . . . . . . . . . . . . . . . . . . . . 26</td><td> </td><td class="right">     3.6.  Warning  . . . . . . . . . . . . . . . . . . . . . . . . . 26</td><td class="lineno" valign="top"></td></tr>
137      <tr><td><a name="diff0009" /></td></tr>
138      <tr><td class="lineno" valign="top"></td><td class="lblock">   4.  History Lists  . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">29</span></td><td> </td><td class="rblock">   4.  History Lists  . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">28</span></td><td class="lineno" valign="top"></td></tr>
139      <tr><td class="lineno" valign="top"></td><td class="lblock">   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . <span class="delete">29</span></td><td> </td><td class="rblock">   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . <span class="insert">28</span></td><td class="lineno" valign="top"></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="lblock">     5.1.  Cache Directive Registry . . . . . . . . . . . . . . . . . <span class="delete">29</span></td><td> </td><td class="rblock">     5.1.  Cache Directive Registry . . . . . . . . . . . . . . . . . <span class="insert">28</span></td><td class="lineno" valign="top"></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="lblock">     5.2.  <span class="delete">Message</span> Header Registration  . . . . . . . . . . . . . . . <span class="delete">30</span></td><td> </td><td class="rblock">     5.2.  Header <span class="insert">Field</span> Registration  . . . . . . . . . . . . . . . <span class="insert">. 29</span></td><td class="lineno" valign="top"></td></tr>
142      <tr><td class="lineno" valign="top"></td><td class="lblock">   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . <span class="delete">30</span></td><td> </td><td class="rblock">   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . <span class="insert">29</span></td><td class="lineno" valign="top"></td></tr>
143      <tr><td class="lineno" valign="top"></td><td class="left">   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right">   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="left">   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right">   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
145      <tr><td class="lineno" valign="top"></td><td class="left">     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right">     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
146      <tr><td class="lineno" valign="top"></td><td class="left">     8.2.  Informative References . . . . . . . . . . . . . . . . . . 31</td><td> </td><td class="right">     8.2.  Informative References . . . . . . . . . . . . . . . . . . 31</td><td class="lineno" valign="top"></td></tr>
147      <tr><td><a name="diff0010" /></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix A.  <span class="delete">Compatibility with Previous Versions  . . . . . . . . 32</span></td><td> </td><td class="rblock">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
149      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     A.1.  Changes from RFC 2068  . . . . . . . . . . . . . . . . . . 32</span></td><td> </td><td class="rblock">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
150      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     A.2.</span>  Changes from RFC 2616  . . . . . . . . . . . . . . . . <span class="delete">. . 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
151      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix B.  Collected ABNF  . . . . . . . . . . . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
152      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix C.  Change Log (to be removed by RFC Editor before</td><td> </td><td class="right">   Appendix C.  Change Log (to be removed by RFC Editor before</td><td class="lineno" valign="top"></td></tr>
153      <tr><td><a name="diff0011" /></td></tr>
154      <tr><td class="lineno" valign="top"></td><td class="lblock">                publication)  . . . . . . . . . . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock">                publication)  . . . . . . . . . . . . . . . . . . . . <span class="insert">33</span></td><td class="lineno" valign="top"></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.1.  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock">     C.1.  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . <span class="insert">33</span></td><td class="lineno" valign="top"></td></tr>
156      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.2.  Since draft-ietf-httpbis-p6-cache-00 . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock">     C.2.  Since draft-ietf-httpbis-p6-cache-00 . . . . . . . . . . . <span class="insert">33</span></td><td class="lineno" valign="top"></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.3.  Since draft-ietf-httpbis-p6-cache-01 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock">     C.3.  Since draft-ietf-httpbis-p6-cache-01 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.4.  Since draft-ietf-httpbis-p6-cache-02 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock">     C.4.  Since draft-ietf-httpbis-p6-cache-02 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
159      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.5.  Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock">     C.5.  Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
160      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.6.  Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock">     C.6.  Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
161      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.7.  Since draft-ietf-httpbis-p6-cache-05 . . . . . . . . . . . <span class="delete">36</span></td><td> </td><td class="rblock">     C.7.  Since draft-ietf-httpbis-p6-cache-05 . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
162      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.8.  Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . <span class="delete">36</span></td><td> </td><td class="rblock">     C.8.  Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.9.  Since draft-ietf-httpbis-p6-cache-07 . . . . . . . . . . . <span class="delete">36</span></td><td> </td><td class="rblock">     C.9.  Since draft-ietf-httpbis-p6-cache-07 . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
164      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.10. Since draft-ietf-httpbis-p6-cache-08 . . . . . . . . . . . <span class="delete">37</span></td><td> </td><td class="rblock">     C.10. Since draft-ietf-httpbis-p6-cache-08 . . . . . . . . . . . <span class="insert">36</span></td><td class="lineno" valign="top"></td></tr>
165      <tr><td class="lineno" valign="top"></td><td class="lblock">     C.11. Since draft-ietf-httpbis-p6-cache-09 . . . . . . . . . . . 37</td><td> </td><td class="rblock">     C.11. Since draft-ietf-httpbis-p6-cache-09 . . . . . . . . . . . <span class="insert">36</span></td><td class="lineno" valign="top"></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="lblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">38</span></td><td> </td><td class="rblock"><span class="insert">     C.12. Since draft-ietf-httpbis-p6-cache-10 . . . . . . . . . . .</span> 37</td><td class="lineno" valign="top"></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">37</span></td><td class="lineno" valign="top"></td></tr>
168      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="left">1.  Introduction</td><td> </td><td class="right">1.  Introduction</td><td class="lineno" valign="top"></td></tr>
170      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
171      <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>
172      <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>
173      <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>
174      <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>
175      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
176      <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>
177      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="left">   An HTTP cache is a local store of response messages and the subsystem</td><td> </td><td class="right">   An HTTP cache is a local store of response messages and the subsystem</td><td class="lineno" valign="top"></td></tr>
179      <tr><td class="lineno" valign="top"></td><td class="left">   that controls its message storage, retrieval, and deletion.  A cache</td><td> </td><td class="right">   that controls its message storage, retrieval, and deletion.  A cache</td><td class="lineno" valign="top"></td></tr>
180      <tr><td class="lineno" valign="top"></td><td class="left">   stores cacheable responses in order to reduce the response time and</td><td> </td><td class="right">   stores cacheable responses in order to reduce the response time and</td><td class="lineno" valign="top"></td></tr>
181      <tr><td class="lineno" valign="top"></td><td class="left">   network bandwidth consumption on future, equivalent requests.  Any</td><td> </td><td class="right">   network bandwidth consumption on future, equivalent requests.  Any</td><td class="lineno" valign="top"></td></tr>
182      <tr><td><a name="diff0012" /></td></tr>
183      <tr><td class="lineno" valign="top"></td><td class="lblock">   client or server <span class="delete">may include</span> a cache, though a cache cannot be used</td><td> </td><td class="rblock">   client or server <span class="insert">MAY employ</span> a cache, though a cache cannot be used by</td><td class="lineno" valign="top"></td></tr>
184      <tr><td class="lineno" valign="top"></td><td class="lblock">   by a server that is acting as a tunnel.</td><td> </td><td class="rblock">   a server that is acting as a tunnel.</td><td class="lineno" valign="top"></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="left">   Caching would be useless if it did not significantly improve</td><td> </td><td class="right">   Caching would be useless if it did not significantly improve</td><td class="lineno" valign="top"></td></tr>
187      <tr><td class="lineno" valign="top"></td><td class="left">   performance.  The goal of caching in HTTP/1.1 is to reuse a prior</td><td> </td><td class="right">   performance.  The goal of caching in HTTP/1.1 is to reuse a prior</td><td class="lineno" valign="top"></td></tr>
188      <tr><td class="lineno" valign="top"></td><td class="left">   response message to satisfy a current request.  In some cases, a</td><td> </td><td class="right">   response message to satisfy a current request.  In some cases, a</td><td class="lineno" valign="top"></td></tr>
189      <tr><td class="lineno" valign="top"></td><td class="left">   stored response can be reused without the need for a network request,</td><td> </td><td class="right">   stored response can be reused without the need for a network request,</td><td class="lineno" valign="top"></td></tr>
190      <tr><td class="lineno" valign="top"></td><td class="left">   reducing latency and network round-trips; a "freshness" mechanism is</td><td> </td><td class="right">   reducing latency and network round-trips; a "freshness" mechanism is</td><td class="lineno" valign="top"></td></tr>
191      <tr><td class="lineno" valign="top"></td><td class="left">   used for this purpose (see Section 2.3).  Even when a new request is</td><td> </td><td class="right">   used for this purpose (see Section 2.3).  Even when a new request is</td><td class="lineno" valign="top"></td></tr>
192      <tr><td class="lineno" valign="top"></td><td class="left">   required, it is often possible to reuse all or parts of the payload</td><td> </td><td class="right">   required, it is often possible to reuse all or parts of the payload</td><td class="lineno" valign="top"></td></tr>
193      <tr><td class="lineno" valign="top"></td><td class="left">   of a prior response to satisfy the request, thereby reducing network</td><td> </td><td class="right">   of a prior response to satisfy the request, thereby reducing network</td><td class="lineno" valign="top"></td></tr>
194      <tr><td class="lineno" valign="top"></td><td class="left">   bandwidth usage; a "validation" mechanism is used for this purpose</td><td> </td><td class="right">   bandwidth usage; a "validation" mechanism is used for this purpose</td><td class="lineno" valign="top"></td></tr>
195      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
196      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 5, line 41</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 5, line 41</em></th><td></td></tr>
197      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
198      <tr><td class="lineno" valign="top"></td><td class="left">1.2.  Terminology</td><td> </td><td class="right">1.2.  Terminology</td><td class="lineno" valign="top"></td></tr>
199      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
200      <tr><td class="lineno" valign="top"></td><td class="left">   This specification uses a number of terms to refer to the roles</td><td> </td><td class="right">   This specification uses a number of terms to refer to the roles</td><td class="lineno" valign="top"></td></tr>
201      <tr><td class="lineno" valign="top"></td><td class="left">   played by participants in, and objects of, HTTP caching.</td><td> </td><td class="right">   played by participants in, and objects of, HTTP caching.</td><td class="lineno" valign="top"></td></tr>
202      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
203      <tr><td class="lineno" valign="top"></td><td class="left">   cacheable</td><td> </td><td class="right">   cacheable</td><td class="lineno" valign="top"></td></tr>
204      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
205      <tr><td class="lineno" valign="top"></td><td class="left">      A response is cacheable if a cache is allowed to store a copy of</td><td> </td><td class="right">      A response is cacheable if a cache is allowed to store a copy of</td><td class="lineno" valign="top"></td></tr>
206      <tr><td class="lineno" valign="top"></td><td class="left">      the response message for use in answering subsequent requests.</td><td> </td><td class="right">      the response message for use in answering subsequent requests.</td><td class="lineno" valign="top"></td></tr>
207      <tr><td><a name="diff0013" /></td></tr>
208      <tr><td class="lineno" valign="top"></td><td class="lblock">      Even when a response is cacheable, there m<span class="delete">ay</span> be additional</td><td> </td><td class="rblock">      Even when a response is cacheable, there m<span class="insert">ight</span> be additional</td><td class="lineno" valign="top"></td></tr>
209      <tr><td class="lineno" valign="top"></td><td class="left">      constraints on whether a cache can use the cached copy to satisfy</td><td> </td><td class="right">      constraints on whether a cache can use the cached copy to satisfy</td><td class="lineno" valign="top"></td></tr>
210      <tr><td class="lineno" valign="top"></td><td class="left">      a particular request.</td><td> </td><td class="right">      a particular request.</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">   explicit expiration time</td><td> </td><td class="right">   explicit expiration time</td><td class="lineno" valign="top"></td></tr>
213      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
214      <tr><td><a name="diff0014" /></td></tr>
215      <tr><td class="lineno" valign="top"></td><td class="lblock">      The time at which the origin server intends that a<span class="delete">n entity should</span></td><td> </td><td class="rblock">      The time at which the origin server intends that a<span class="insert"> representation</span></td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="left">      no longer be returned by a cache without further validation.</td><td> </td><td class="right">      no longer be returned by a cache without further validation.</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">   heuristic expiration time</td><td> </td><td class="right">   heuristic expiration time</td><td class="lineno" valign="top"></td></tr>
219      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
220      <tr><td class="lineno" valign="top"></td><td class="left">      An expiration time assigned by a cache when no explicit expiration</td><td> </td><td class="right">      An expiration time assigned by a cache when no explicit expiration</td><td class="lineno" valign="top"></td></tr>
221      <tr><td class="lineno" valign="top"></td><td class="left">      time is available.</td><td> </td><td class="right">      time is available.</td><td class="lineno" valign="top"></td></tr>
222      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
223      <tr><td class="lineno" valign="top"></td><td class="left">   age</td><td> </td><td class="right">   age</td><td class="lineno" valign="top"></td></tr>
224      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
225      <tr><td class="lineno" valign="top"></td><td class="left">      The age of a response is the time since it was sent by, or</td><td> </td><td class="right">      The age of a response is the time since it was sent by, or</td><td class="lineno" valign="top"></td></tr>
226      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
227      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 6, line 37</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 6, line 37</em></th><td></td></tr>
228      <tr><td class="lineno" valign="top"></td><td class="left">      A response is fresh if its age has not yet exceeded its freshness</td><td> </td><td class="right">      A response is fresh if its age has not yet exceeded its freshness</td><td class="lineno" valign="top"></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="left">      lifetime.</td><td> </td><td class="right">      lifetime.</td><td class="lineno" valign="top"></td></tr>
230      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
231      <tr><td class="lineno" valign="top"></td><td class="left">   stale</td><td> </td><td class="right">   stale</td><td class="lineno" valign="top"></td></tr>
232      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
233      <tr><td class="lineno" valign="top"></td><td class="left">      A response is stale if its age has passed its freshness lifetime</td><td> </td><td class="right">      A response is stale if its age has passed its freshness lifetime</td><td class="lineno" valign="top"></td></tr>
234      <tr><td class="lineno" valign="top"></td><td class="left">      (either explicit or heuristic).</td><td> </td><td class="right">      (either explicit or heuristic).</td><td class="lineno" valign="top"></td></tr>
235      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="left">   validator</td><td> </td><td class="right">   validator</td><td class="lineno" valign="top"></td></tr>
237      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
238      <tr><td><a name="diff0015" /></td></tr>
239      <tr><td class="lineno" valign="top"></td><td class="lblock">      A protocol element (e.g., an <span class="delete">entity tag</span> or a Last-Modified time)</td><td> </td><td class="rblock">      A protocol element (e.g., an <span class="insert">entity-tag</span> or a Last-Modified time)</td><td class="lineno" valign="top"></td></tr>
240      <tr><td class="lineno" valign="top"></td><td class="lblock">      that is used to find out whether a stored response <span class="delete">is</span> an</td><td> </td><td class="rblock">      that is used to find out whether a stored response <span class="insert">has</span> an</td><td class="lineno" valign="top"></td></tr>
241      <tr><td class="lineno" valign="top"></td><td class="lblock">      equivalent copy of <span class="delete">an entity.</span></td><td> </td><td class="rblock">      equivalent copy of <span class="insert">a representation.</span></td><td class="lineno" valign="top"></td></tr>
242      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
243      <tr><td class="lineno" valign="top"></td><td class="left">   shared cache</td><td> </td><td class="right">   shared cache</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">      A cache that is accessible to more than one user.  A non-shared</td><td> </td><td class="right">      A cache that is accessible to more than one user.  A non-shared</td><td class="lineno" valign="top"></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="left">      cache is dedicated to a single user.</td><td> </td><td class="right">      cache is dedicated to a single user.</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">1.3.  Requirements</td><td> </td><td class="right">1.3.  Requirements</td><td class="lineno" valign="top"></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="left">   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</td><td> </td><td class="right">   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</td><td class="lineno" valign="top"></td></tr>
251      <tr><td class="lineno" valign="top"></td><td class="left">   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this</td><td> </td><td class="right">   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this</td><td class="lineno" valign="top"></td></tr>
252      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
253      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 9, line 14</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 9, line 14</em></th><td></td></tr>
254      <tr><td class="lineno" valign="top"></td><td class="left">   status code.</td><td> </td><td class="right">   status code.</td><td class="lineno" valign="top"></td></tr>
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">   A cache that does not support the Range and Content-Range headers</td><td> </td><td class="right">   A cache that does not support the Range and Content-Range headers</td><td class="lineno" valign="top"></td></tr>
257      <tr><td class="lineno" valign="top"></td><td class="left">   MUST NOT store incomplete or partial responses.</td><td> </td><td class="right">   MUST NOT store incomplete or partial responses.</td><td class="lineno" valign="top"></td></tr>
258      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
259      <tr><td class="lineno" valign="top"></td><td class="left">2.2.  Constructing Responses from Caches</td><td> </td><td class="right">2.2.  Constructing Responses from Caches</td><td class="lineno" valign="top"></td></tr>
260      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
261      <tr><td class="lineno" valign="top"></td><td class="left">   For a presented request, a cache MUST NOT return a stored response,</td><td> </td><td class="right">   For a presented request, a cache MUST NOT return a stored response,</td><td class="lineno" valign="top"></td></tr>
262      <tr><td class="lineno" valign="top"></td><td class="left">   unless:</td><td> </td><td class="right">   unless:</td><td class="lineno" valign="top"></td></tr>
263      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
264      <tr><td><a name="diff0016" /></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="lblock">   o  The presented <span class="delete">Effective R</span>equest URI (Section 4.3 of [Part1]) and</td><td> </td><td class="rblock">   o  The presented <span class="insert">effective r</span>equest URI (Section 4.3 of [Part1]) and</td><td class="lineno" valign="top"></td></tr>
266      <tr><td class="lineno" valign="top"></td><td class="left">      that of the stored response match, and</td><td> </td><td class="right">      that of the stored response match, and</td><td class="lineno" valign="top"></td></tr>
267      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
268      <tr><td class="lineno" valign="top"></td><td class="left">   o  the request method associated with the stored response allows it</td><td> </td><td class="right">   o  the request method associated with the stored response allows it</td><td class="lineno" valign="top"></td></tr>
269      <tr><td class="lineno" valign="top"></td><td class="left">      to be used for the presented request, and</td><td> </td><td class="right">      to be used for the presented request, and</td><td class="lineno" valign="top"></td></tr>
270      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
271      <tr><td class="lineno" valign="top"></td><td class="left">   o  selecting request-headers nominated by the stored response (if</td><td> </td><td class="right">   o  selecting request-headers nominated by the stored response (if</td><td class="lineno" valign="top"></td></tr>
272      <tr><td class="lineno" valign="top"></td><td class="left">      any) match those presented (see Section 2.7), and</td><td> </td><td class="right">      any) match those presented (see Section 2.7), and</td><td class="lineno" valign="top"></td></tr>
273      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
274      <tr><td class="lineno" valign="top"></td><td class="left">   o  the presented request and stored response are free from directives</td><td> </td><td class="right">   o  the presented request and stored response are free from directives</td><td class="lineno" valign="top"></td></tr>
275      <tr><td class="lineno" valign="top"></td><td class="left">      that would prevent its use (see Section 3.2 and Section 3.4), and</td><td> </td><td class="right">      that would prevent its use (see Section 3.2 and Section 3.4), and</td><td class="lineno" valign="top"></td></tr>
276      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
277      <tr><td class="lineno" valign="top"></td><td class="left">   o  the stored response is either:</td><td> </td><td class="right">   o  the stored response is either:</td><td class="lineno" valign="top"></td></tr>
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">      *  fresh (see Section 2.3), or</td><td> </td><td class="right">      *  fresh (see Section 2.3), or</td><td class="lineno" valign="top"></td></tr>
280      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
281      <tr><td class="lineno" valign="top"></td><td class="left">      *  allowed to be served stale (see Section 2.3.3), or</td><td> </td><td class="right">      *  allowed to be served stale (see Section 2.3.3), or</td><td class="lineno" valign="top"></td></tr>
282      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
283      <tr><td class="lineno" valign="top"></td><td class="left">      *  successfully validated (see Section 2.4).</td><td> </td><td class="right">      *  successfully validated (see Section 2.4).</td><td class="lineno" valign="top"></td></tr>
284      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
285      <tr><td><a name="diff0017" /></td></tr>
286      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[TODO-method-cacheability: define method cacheability for GET, HEAD</span></td><td> </td><td class="rblock">   When a stored response is used to satisfy a <span class="insert">request without</span></td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   and POST in p2-semantics.]]</span></td><td> </td><td class="rblock"><span class="insert">   validation,</span> caches MUST include a single Age header field</td><td class="lineno" valign="top"></td></tr>
288      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                                         </td><td> </td><td class="rblock">   (Section 3.1) in the response with a value equal to the stored</td><td class="lineno" valign="top"></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="lblock">   When a stored response is used to satisfy a <span class="delete">request,</span> caches MUST</td><td> </td><td class="rblock">   response's current_age; see Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
290      <tr><td class="lineno" valign="top"></td><td class="lblock">   include a single Age header field (Section 3.1) in the response with</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
291      <tr><td class="lineno" valign="top"></td><td class="lblock">   a value equal to the stored response's current_age; see</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
292      <tr><td class="lineno" valign="top"></td><td class="lblock">   Section 2.3.2.  <span class="delete">[[DISCUSS-includes-validated: this currently includes</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
293      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   successfully validated responses.]]</span></td><td> </td><td class="rblock"></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">   Requests with methods that are unsafe (Section 7.1.1 of [Part2]) MUST</td><td> </td><td class="right">   Requests with methods that are unsafe (Section 7.1.1 of [Part2]) MUST</td><td class="lineno" valign="top"></td></tr>
296      <tr><td class="lineno" valign="top"></td><td class="left">   be written through the cache to the origin server; i.e., a cache must</td><td> </td><td class="right">   be written through the cache to the origin server; i.e., a cache must</td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="left">   not reply to such a request before having forwarded the request and</td><td> </td><td class="right">   not reply to such a request before having forwarded the request and</td><td class="lineno" valign="top"></td></tr>
298      <tr><td class="lineno" valign="top"></td><td class="left">   having received a corresponding response.</td><td> </td><td class="right">   having received a corresponding response.</td><td class="lineno" valign="top"></td></tr>
299      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
300      <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>
301      <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>
302      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
303      <tr><td class="lineno" valign="top"></td><td class="left">   Caches MUST use the most recent response (as determined by the Date</td><td> </td><td class="right">   Caches MUST use the most recent response (as determined by the Date</td><td class="lineno" valign="top"></td></tr>
304      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
305      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 10, line 19</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 10, line 16</em></th><td></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">   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>
308      <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>
309      <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>
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">   The primary mechanism for determining freshness is for an origin</td><td> </td><td class="right">   The primary mechanism for determining freshness is for an origin</td><td class="lineno" valign="top"></td></tr>
312      <tr><td class="lineno" valign="top"></td><td class="left">   server to provide an explicit expiration time in the future, using</td><td> </td><td class="right">   server to provide an explicit expiration time in the future, using</td><td class="lineno" valign="top"></td></tr>
313      <tr><td class="lineno" valign="top"></td><td class="left">   either the Expires header (Section 3.3) or the max-age response cache</td><td> </td><td class="right">   either the Expires header (Section 3.3) or the max-age response cache</td><td class="lineno" valign="top"></td></tr>
314      <tr><td class="lineno" valign="top"></td><td class="left">   directive (Section 3.2.2).  Generally, origin servers will assign</td><td> </td><td class="right">   directive (Section 3.2.2).  Generally, origin servers will assign</td><td class="lineno" valign="top"></td></tr>
315      <tr><td class="lineno" valign="top"></td><td class="left">   future explicit expiration times to responses in the belief that the</td><td> </td><td class="right">   future explicit expiration times to responses in the belief that the</td><td class="lineno" valign="top"></td></tr>
316      <tr><td><a name="diff0018" /></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">entity</span> is not likely to change in a semantically significant way</td><td> </td><td class="rblock">   <span class="insert">representation</span> is not likely to change in a semantically significant</td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="lblock">   before the expiration time is reached.</td><td> </td><td class="rblock">   way before the expiration time is reached.</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">   If an origin server wishes to force a cache to validate every</td><td> </td><td class="right">   If an origin server wishes to force a cache to validate every</td><td class="lineno" valign="top"></td></tr>
321      <tr><td><a name="diff0019" /></td></tr>
322      <tr><td class="lineno" valign="top"></td><td class="lblock">   request, it can assign an explicit expiration time in the <span class="delete">past.  This</span></td><td> </td><td class="rblock">   request, it can assign an explicit expiration time in the <span class="insert">past to</span></td><td class="lineno" valign="top"></td></tr>
323      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   means</span> that the response is <span class="delete">always stale, so that</span> caches <span class="delete">should</span></td><td> </td><td class="rblock"><span class="insert">   indicate</span> that the response is <span class="insert">already stale.  Compliant</span> caches <span class="insert">will</span></td><td class="lineno" valign="top"></td></tr>
324      <tr><td class="lineno" valign="top"></td><td class="lblock">   validate <span class="delete">it</span> before <span class="delete">using</span> it for subsequent requests.  <span class="delete">[[TODO-</span></td><td> </td><td class="rblock">   validate <span class="insert">the cached response</span> before <span class="insert">reusing</span> it for subsequent</td><td class="lineno" valign="top"></td></tr>
325      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   response-stale: This wording may cause confusion, because the</span></td><td> </td><td class="rblock">   requests.</td><td class="lineno" valign="top"></td></tr>
326      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   response may still be served stale.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
327      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
328      <tr><td class="lineno" valign="top"></td><td class="left">   Since origin servers do not always provide explicit expiration times,</td><td> </td><td class="right">   Since origin servers do not always provide explicit expiration times,</td><td class="lineno" valign="top"></td></tr>
329      <tr><td><a name="diff0020" /></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="lblock">   HTTP caches <span class="delete">may also</span> assign heuristic expiration times when <span class="delete">they</span> are</td><td> </td><td class="rblock">   HTTP caches <span class="insert">MAY</span> assign heuristic expiration times when <span class="insert">explicit times</span></td><td class="lineno" valign="top"></td></tr>
331      <tr><td class="lineno" valign="top"></td><td class="lblock">   not specified, employing algorithms that use other header values</td><td> </td><td class="rblock">   are not specified, employing algorithms that use other header values</td><td class="lineno" valign="top"></td></tr>
332      <tr><td class="lineno" valign="top"></td><td class="left">   (such as the Last-Modified time) to estimate a plausible expiration</td><td> </td><td class="right">   (such as the Last-Modified time) to estimate a plausible expiration</td><td class="lineno" valign="top"></td></tr>
333      <tr><td class="lineno" valign="top"></td><td class="left">   time.  The HTTP/1.1 specification does not provide specific</td><td> </td><td class="right">   time.  The HTTP/1.1 specification does not provide specific</td><td class="lineno" valign="top"></td></tr>
334      <tr><td class="lineno" valign="top"></td><td class="left">   algorithms, but does impose worst-case constraints on their results.</td><td> </td><td class="right">   algorithms, but does impose worst-case constraints on their results.</td><td class="lineno" valign="top"></td></tr>
335      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
336      <tr><td class="lineno" valign="top"></td><td class="left">   The calculation to determine if a response is fresh is:</td><td> </td><td class="right">   The calculation to determine if a response is fresh is:</td><td class="lineno" valign="top"></td></tr>
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 class="lineno" valign="top"></td><td class="left">      response_is_fresh = (freshness_lifetime &gt; current_age)</td><td> </td><td class="right">      response_is_fresh = (freshness_lifetime &gt; current_age)</td><td class="lineno" valign="top"></td></tr>
339      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
340      <tr><td class="lineno" valign="top"></td><td class="left">   The freshness_lifetime is defined in Section 2.3.1; the current_age</td><td> </td><td class="right">   The freshness_lifetime is defined in Section 2.3.1; the current_age</td><td class="lineno" valign="top"></td></tr>
341      <tr><td class="lineno" valign="top"></td><td class="left">   is defined in Section 2.3.2.</td><td> </td><td class="right">   is defined in Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
342      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
343      <tr><td><a name="diff0021" /></td></tr>
344      <tr><td class="lineno" valign="top"></td><td class="lblock">   Additionally, clients m<span class="delete">ay</span> need to influence freshness calculation.</td><td> </td><td class="rblock">   Additionally, clients m<span class="insert">ight</span> need to influence freshness calculation.</td><td class="lineno" valign="top"></td></tr>
345      <tr><td class="lineno" valign="top"></td><td class="left">   They can do this using several request cache directives, with the</td><td> </td><td class="right">   They can do this using several request cache directives, with the</td><td class="lineno" valign="top"></td></tr>
346      <tr><td class="lineno" valign="top"></td><td class="left">   effect of either increasing or loosening constraints on freshness.</td><td> </td><td class="right">   effect of either increasing or loosening constraints on freshness.</td><td class="lineno" valign="top"></td></tr>
347      <tr><td class="lineno" valign="top"></td><td class="left">   See Section 3.2.1.</td><td> </td><td class="right">   See Section 3.2.1.</td><td class="lineno" valign="top"></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left">   [[ISSUE-no-req-for-directives: there are not requirements directly</td><td> </td><td class="right">   [[ISSUE-no-req-for-directives: there are not requirements directly</td><td class="lineno" valign="top"></td></tr>
350      <tr><td class="lineno" valign="top"></td><td class="left">   applying to cache-request-directives and freshness.]]</td><td> </td><td class="right">   applying to cache-request-directives and freshness.]]</td><td class="lineno" valign="top"></td></tr>
351      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
352      <tr><td class="lineno" valign="top"></td><td class="left">   Note that freshness applies only to cache operation; it cannot be</td><td> </td><td class="right">   Note that freshness applies only to cache operation; it cannot be</td><td class="lineno" valign="top"></td></tr>
353      <tr><td class="lineno" valign="top"></td><td class="left">   used to force a user agent to refresh its display or reload a</td><td> </td><td class="right">   used to force a user agent to refresh its display or reload a</td><td class="lineno" valign="top"></td></tr>
354      <tr><td class="lineno" valign="top"></td><td class="left">   resource.  See Section 4 for an explanation of the difference between</td><td> </td><td class="right">   resource.  See Section 4 for an explanation of the difference between</td><td class="lineno" valign="top"></td></tr>
355      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
356      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 11, line 32</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 11, line 29</em></th><td></td></tr>
357      <tr><td class="lineno" valign="top"></td><td class="left">   o  Otherwise, no explicit expiration time is present in the response.</td><td> </td><td class="right">   o  Otherwise, no explicit expiration time is present in the response.</td><td class="lineno" valign="top"></td></tr>
358      <tr><td class="lineno" valign="top"></td><td class="left">      A heuristic freshness lifetime might be applicable; see</td><td> </td><td class="right">      A heuristic freshness lifetime might be applicable; see</td><td class="lineno" valign="top"></td></tr>
359      <tr><td class="lineno" valign="top"></td><td class="left">      Section 2.3.1.1.</td><td> </td><td class="right">      Section 2.3.1.1.</td><td class="lineno" valign="top"></td></tr>
360      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
361      <tr><td class="lineno" valign="top"></td><td class="left">   Note that this calculation is not vulnerable to clock skew, since all</td><td> </td><td class="right">   Note that this calculation is not vulnerable to clock skew, since all</td><td class="lineno" valign="top"></td></tr>
362      <tr><td class="lineno" valign="top"></td><td class="left">   of the information comes from the origin server.</td><td> </td><td class="right">   of the information comes from the origin server.</td><td class="lineno" valign="top"></td></tr>
363      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
364      <tr><td class="lineno" valign="top"></td><td class="left">2.3.1.1.  Calculating Heuristic Freshness</td><td> </td><td class="right">2.3.1.1.  Calculating Heuristic Freshness</td><td class="lineno" valign="top"></td></tr>
365      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
366      <tr><td class="lineno" valign="top"></td><td class="left">   If no explicit expiration time is present in a stored response that</td><td> </td><td class="right">   If no explicit expiration time is present in a stored response that</td><td class="lineno" valign="top"></td></tr>
367      <tr><td><a name="diff0022" /></td></tr>
368      <tr><td class="lineno" valign="top"></td><td class="lblock">   has a status code of 200, 203, 206, 300, 301 <span class="delete">or 410,</span> a heuristic</td><td> </td><td class="rblock">   has a status code <span class="insert">whose definition allows heuristic freshness to be</span></td><td class="lineno" valign="top"></td></tr>
369      <tr><td class="lineno" valign="top"></td><td class="lblock">   expiration time <span class="delete">can</span> be calculated.  Heuristics MUST NOT be used for</td><td> </td><td class="rblock"><span class="insert">   used (including the following in Section 8</span> of <span class="insert">[Part2]:</span> 200, 203, 206,</td><td class="lineno" valign="top"></td></tr>
370      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">other</span> response status <span class="delete">codes.</span></td><td> </td><td class="rblock">   300, 301 <span class="insert">and 410),</span> a heuristic expiration time <span class="insert">MAY</span> be calculated.</td><td class="lineno" valign="top"></td></tr>
371      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   Heuristics MUST NOT be used for response status <span class="insert">codes that do not</span></td><td class="lineno" valign="top"></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   explicitly allow it.</span></td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
374      <tr><td class="lineno" valign="top"></td><td class="left">   When a heuristic is used to calculate freshness lifetime, the cache</td><td> </td><td class="right">   When a heuristic is used to calculate freshness lifetime, the cache</td><td class="lineno" valign="top"></td></tr>
375      <tr><td class="lineno" valign="top"></td><td class="left">   SHOULD attach a Warning header with a 113 warn-code to the response</td><td> </td><td class="right">   SHOULD attach a Warning header with a 113 warn-code to the response</td><td class="lineno" valign="top"></td></tr>
376      <tr><td class="lineno" valign="top"></td><td class="left">   if its current_age is more than 24 hours and such a warning is not</td><td> </td><td class="right">   if its current_age is more than 24 hours and such a warning is not</td><td class="lineno" valign="top"></td></tr>
377      <tr><td class="lineno" valign="top"></td><td class="left">   already present.</td><td> </td><td class="right">   already present.</td><td class="lineno" valign="top"></td></tr>
378      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
379      <tr><td class="lineno" valign="top"></td><td class="left">   Also, if the response has a Last-Modified header (Section 6.6 of</td><td> </td><td class="right">   Also, if the response has a Last-Modified header (Section 6.6 of</td><td class="lineno" valign="top"></td></tr>
380      <tr><td class="lineno" valign="top"></td><td class="left">   [Part4]), the heuristic expiration value SHOULD be no more than some</td><td> </td><td class="right">   [Part4]), the heuristic expiration value SHOULD be no more than some</td><td class="lineno" valign="top"></td></tr>
381      <tr><td class="lineno" valign="top"></td><td class="left">   fraction of the interval since that time.  A typical setting of this</td><td> </td><td class="right">   fraction of the interval since that time.  A typical setting of this</td><td class="lineno" valign="top"></td></tr>
382      <tr><td class="lineno" valign="top"></td><td class="left">   fraction might be 10%.</td><td> </td><td class="right">   fraction might be 10%.</td><td class="lineno" valign="top"></td></tr>
383      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
384      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 14, line 39</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 14, line 39</em></th><td></td></tr>
385      <tr><td class="lineno" valign="top"></td><td class="left">   requested URI, if present.  However, if any of the stored responses</td><td> </td><td class="right">   requested URI, if present.  However, if any of the stored responses</td><td class="lineno" valign="top"></td></tr>
386      <tr><td class="lineno" valign="top"></td><td class="left">   contains only partial content, its entity-tag SHOULD NOT be included</td><td> </td><td class="right">   contains only partial content, its entity-tag SHOULD NOT be included</td><td class="lineno" valign="top"></td></tr>
387      <tr><td class="lineno" valign="top"></td><td class="left">   in the If-None-Match header field unless the request is for a range</td><td> </td><td class="right">   in the If-None-Match header field unless the request is for a range</td><td class="lineno" valign="top"></td></tr>
388      <tr><td class="lineno" valign="top"></td><td class="left">   that would be fully satisfied by that stored response.</td><td> </td><td class="right">   that would be fully satisfied by that stored response.</td><td class="lineno" valign="top"></td></tr>
389      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
390      <tr><td class="lineno" valign="top"></td><td class="left">   A 304 (Not Modified) response status code indicates that the stored</td><td> </td><td class="right">   A 304 (Not Modified) response status code indicates that the stored</td><td class="lineno" valign="top"></td></tr>
391      <tr><td class="lineno" valign="top"></td><td class="left">   response can be updated and reused; see Section 2.8.</td><td> </td><td class="right">   response can be updated and reused; see Section 2.8.</td><td class="lineno" valign="top"></td></tr>
392      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
393      <tr><td class="lineno" valign="top"></td><td class="left">   A full response (i.e., one with a response body) indicates that none</td><td> </td><td class="right">   A full response (i.e., one with a response body) indicates that none</td><td class="lineno" valign="top"></td></tr>
394      <tr><td class="lineno" valign="top"></td><td class="left">   of the stored responses nominated in the conditional request is</td><td> </td><td class="right">   of the stored responses nominated in the conditional request is</td><td class="lineno" valign="top"></td></tr>
395      <tr><td><a name="diff0023" /></td></tr>
396      <tr><td class="lineno" valign="top"></td><td class="lblock">   suitable.  Instead, the full response <span class="delete">is</span> used <span class="delete">both</span> to satisfy the</td><td> </td><td class="rblock">   suitable.  Instead, the full response <span class="insert">SHOULD be</span> used to satisfy the</td><td class="lineno" valign="top"></td></tr>
397      <tr><td class="lineno" valign="top"></td><td class="lblock">   request and replace the stored response.  <span class="delete">[[TODO-req-missing: Should</span></td><td> </td><td class="rblock">   request and <span class="insert">MAY</span> replace the stored response.</td><td class="lineno" valign="top"></td></tr>
398      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   there be a requirement here?]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
399      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
400      <tr><td class="lineno" valign="top"></td><td class="left">   If a cache receives a 5xx response while attempting to validate a</td><td> </td><td class="right">   If a cache receives a 5xx response while attempting to validate a</td><td class="lineno" valign="top"></td></tr>
401      <tr><td class="lineno" valign="top"></td><td class="left">   response, it MAY either forward this response to the requesting</td><td> </td><td class="right">   response, it MAY either forward this response to the requesting</td><td class="lineno" valign="top"></td></tr>
402      <tr><td class="lineno" valign="top"></td><td class="left">   client, or act as if the server failed to respond.  In the latter</td><td> </td><td class="right">   client, or act as if the server failed to respond.  In the latter</td><td class="lineno" valign="top"></td></tr>
403      <tr><td class="lineno" valign="top"></td><td class="left">   case, it MAY return a previously stored response (see Section 2.3.3).</td><td> </td><td class="right">   case, it MAY return a previously stored response (see Section 2.3.3).</td><td class="lineno" valign="top"></td></tr>
404      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
405      <tr><td class="lineno" valign="top"></td><td class="left">2.5.  Request Methods that Invalidate</td><td> </td><td class="right">2.5.  Request Methods that Invalidate</td><td class="lineno" valign="top"></td></tr>
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">   Because unsafe methods (Section 7.1.1 of [Part2]) have the potential</td><td> </td><td class="right">   Because unsafe methods (Section 7.1.1 of [Part2]) have the potential</td><td class="lineno" valign="top"></td></tr>
408      <tr><td class="lineno" valign="top"></td><td class="left">   for changing state on the origin server, intervening caches can use</td><td> </td><td class="right">   for changing state on the origin server, intervening caches can use</td><td class="lineno" valign="top"></td></tr>
409      <tr><td class="lineno" valign="top"></td><td class="left">   them to keep their contents up-to-date.</td><td> </td><td class="right">   them to keep their contents up-to-date.</td><td class="lineno" valign="top"></td></tr>
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">   The following HTTP methods MUST cause a cache to invalidate the</td><td> </td><td class="right">   The following HTTP methods MUST cause a cache to invalidate the</td><td class="lineno" valign="top"></td></tr>
412      <tr><td><a name="diff0024" /></td></tr>
413      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">E</span>ffective Request URI (Section 4.3 of [Part1]) as well as the URI(s)</td><td> </td><td class="rblock">   <span class="insert">e</span>ffective Request URI (Section 4.3 of [Part1]) as well as the URI(s)</td><td class="lineno" valign="top"></td></tr>
414      <tr><td class="lineno" valign="top"></td><td class="left">   in the Location and Content-Location headers (if present):</td><td> </td><td class="right">   in the Location and Content-Location headers (if present):</td><td class="lineno" valign="top"></td></tr>
415      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
416      <tr><td class="lineno" valign="top"></td><td class="left">   o  PUT</td><td> </td><td class="right">   o  PUT</td><td class="lineno" valign="top"></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
418      <tr><td class="lineno" valign="top"></td><td class="left">   o  DELETE</td><td> </td><td class="right">   o  DELETE</td><td class="lineno" valign="top"></td></tr>
419      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
420      <tr><td class="lineno" valign="top"></td><td class="left">   o  POST</td><td> </td><td class="right">   o  POST</td><td class="lineno" valign="top"></td></tr>
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">   An invalidation based on a URI from a Location or Content-Location</td><td> </td><td class="right">   An invalidation based on a URI from a Location or Content-Location</td><td class="lineno" valign="top"></td></tr>
423      <tr><td class="lineno" valign="top"></td><td class="left">   header MUST NOT be performed if the host part of that URI differs</td><td> </td><td class="right">   header MUST NOT be performed if the host part of that URI differs</td><td class="lineno" valign="top"></td></tr>
424      <tr><td><a name="diff0025" /></td></tr>
425      <tr><td class="lineno" valign="top"></td><td class="lblock">   from the host part in the <span class="delete">Effective R</span>equest URI (Section 4.3 of</td><td> </td><td class="rblock">   from the host part in the <span class="insert">effective r</span>equest URI (Section 4.3 of</td><td class="lineno" valign="top"></td></tr>
426      <tr><td class="lineno" valign="top"></td><td class="left">   [Part1]).  This helps prevent denial of service attacks.</td><td> </td><td class="right">   [Part1]).  This helps prevent denial of service attacks.</td><td class="lineno" valign="top"></td></tr>
427      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
428      <tr><td><a name="diff0026" /></td></tr>
429      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[TODO-def-host-part: "host part" needs to be specified better.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
430      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                                         </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
431      <tr><td class="lineno" valign="top"></td><td class="left">   A cache that passes through requests for methods it does not</td><td> </td><td class="right">   A cache that passes through requests for methods it does not</td><td class="lineno" valign="top"></td></tr>
432      <tr><td><a name="diff0027" /></td></tr>
433      <tr><td class="lineno" valign="top"></td><td class="lblock">   understand SHOULD invalidate the <span class="delete">Effective R</span>equest URI (Section 4.3</td><td> </td><td class="rblock">   understand SHOULD invalidate the <span class="insert">effective r</span>equest URI (Section 4.3</td><td class="lineno" valign="top"></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="left">   of [Part1]).</td><td> </td><td class="right">   of [Part1]).</td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
436      <tr><td class="lineno" valign="top"></td><td class="left">   Here, "invalidate" means that the cache will either remove all stored</td><td> </td><td class="right">   Here, "invalidate" means that the cache will either remove all stored</td><td class="lineno" valign="top"></td></tr>
437      <tr><td><a name="diff0028" /></td></tr>
438      <tr><td class="lineno" valign="top"></td><td class="lblock">   responses related to the <span class="delete">Effective R</span>equest URI, or will mark these as</td><td> </td><td class="rblock">   responses related to the <span class="insert">effective r</span>equest URI, or will mark these as</td><td class="lineno" valign="top"></td></tr>
439      <tr><td class="lineno" valign="top"></td><td class="left">   "invalid" and in need of a mandatory validation before they can be</td><td> </td><td class="right">   "invalid" and in need of a mandatory validation before they can be</td><td class="lineno" valign="top"></td></tr>
440      <tr><td class="lineno" valign="top"></td><td class="left">   returned in response to a subsequent request.</td><td> </td><td class="right">   returned in response to a subsequent request.</td><td class="lineno" valign="top"></td></tr>
441      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
442      <tr><td class="lineno" valign="top"></td><td class="left">   Note that this does not guarantee that all appropriate responses are</td><td> </td><td class="right">   Note that this does not guarantee that all appropriate responses are</td><td class="lineno" valign="top"></td></tr>
443      <tr><td class="lineno" valign="top"></td><td class="left">   invalidated.  For example, the request that caused the change at the</td><td> </td><td class="right">   invalidated.  For example, the request that caused the change at the</td><td class="lineno" valign="top"></td></tr>
444      <tr><td class="lineno" valign="top"></td><td class="left">   origin server might not have gone through the cache where a response</td><td> </td><td class="right">   origin server might not have gone through the cache where a response</td><td class="lineno" valign="top"></td></tr>
445      <tr><td class="lineno" valign="top"></td><td class="left">   is stored.</td><td> </td><td class="right">   is stored.</td><td class="lineno" valign="top"></td></tr>
446      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
447      <tr><td><a name="diff0029" /></td></tr>
448      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[TODO-spec-success-invalidate: specify that only successful (2xx,</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
449      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   3xx?) responses invalidate.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
450      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                                         </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
451      <tr><td class="lineno" valign="top"></td><td class="left">2.6.  Shared Caching of Authenticated Responses</td><td> </td><td class="right">2.6.  Shared Caching of Authenticated Responses</td><td class="lineno" valign="top"></td></tr>
452      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
453      <tr><td class="lineno" valign="top"></td><td class="left">   Shared caches MUST NOT use a cached response to a request with an</td><td> </td><td class="right">   Shared caches MUST NOT use a cached response to a request with an</td><td class="lineno" valign="top"></td></tr>
454      <tr><td class="lineno" valign="top"></td><td class="left">   Authorization header (Section 3.1 of [Part7]) to satisfy any</td><td> </td><td class="right">   Authorization header (Section 3.1 of [Part7]) to satisfy any</td><td class="lineno" valign="top"></td></tr>
455      <tr><td class="lineno" valign="top"></td><td class="left">   subsequent request unless a cache directive that allows such</td><td> </td><td class="right">   subsequent request unless a cache directive that allows such</td><td class="lineno" valign="top"></td></tr>
456      <tr><td class="lineno" valign="top"></td><td class="left">   responses to be stored is present in the response.</td><td> </td><td class="right">   responses to be stored is present in the response.</td><td class="lineno" valign="top"></td></tr>
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">   In this specification, the following Cache-Control response</td><td> </td><td class="right">   In this specification, the following Cache-Control response</td><td class="lineno" valign="top"></td></tr>
459      <tr><td class="lineno" valign="top"></td><td class="left">   directives (Section 3.2.2) have such an effect: must-revalidate,</td><td> </td><td class="right">   directives (Section 3.2.2) have such an effect: must-revalidate,</td><td class="lineno" valign="top"></td></tr>
460      <tr><td class="lineno" valign="top"></td><td class="left">   public, s-maxage.</td><td> </td><td class="right">   public, s-maxage.</td><td class="lineno" valign="top"></td></tr>
461      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
462      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 16, line 32</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 16, line 29</em></th><td></td></tr>
463      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
464      <tr><td class="lineno" valign="top"></td><td class="left">   o  combining multiple message-header fields with the same field name</td><td> </td><td class="right">   o  combining multiple message-header fields with the same field name</td><td class="lineno" valign="top"></td></tr>
465      <tr><td class="lineno" valign="top"></td><td class="left">      (see Section 3.2 of [Part1])</td><td> </td><td class="right">      (see Section 3.2 of [Part1])</td><td class="lineno" valign="top"></td></tr>
466      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
467      <tr><td class="lineno" valign="top"></td><td class="left">   o  normalizing both header values in a way that is known to have</td><td> </td><td class="right">   o  normalizing both header values in a way that is known to have</td><td class="lineno" valign="top"></td></tr>
468      <tr><td class="lineno" valign="top"></td><td class="left">      identical semantics, according to the header's specification</td><td> </td><td class="right">      identical semantics, according to the header's specification</td><td class="lineno" valign="top"></td></tr>
469      <tr><td class="lineno" valign="top"></td><td class="left">      (e.g., re-ordering field values when order is not significant;</td><td> </td><td class="right">      (e.g., re-ordering field values when order is not significant;</td><td class="lineno" valign="top"></td></tr>
470      <tr><td class="lineno" valign="top"></td><td class="left">      case-normalization, where values are defined to be case-</td><td> </td><td class="right">      case-normalization, where values are defined to be case-</td><td class="lineno" valign="top"></td></tr>
471      <tr><td class="lineno" valign="top"></td><td class="left">      insensitive)</td><td> </td><td class="right">      insensitive)</td><td class="lineno" valign="top"></td></tr>
472      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
473      <tr><td><a name="diff0030" /></td></tr>
474      <tr><td class="lineno" valign="top"></td><td class="lblock">   If (after any normali<span class="delete">sation that may</span> take place) a header field is</td><td> </td><td class="rblock">   If (after any normali<span class="insert">zation that might</span> take place) a header field is</td><td class="lineno" valign="top"></td></tr>
475      <tr><td class="lineno" valign="top"></td><td class="left">   absent from a request, it can only match another request if it is</td><td> </td><td class="right">   absent from a request, it can only match another request if it is</td><td class="lineno" valign="top"></td></tr>
476      <tr><td class="lineno" valign="top"></td><td class="left">   also absent there.</td><td> </td><td class="right">   also absent there.</td><td class="lineno" valign="top"></td></tr>
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">   A Vary header field-value of "*" always fails to match, and</td><td> </td><td class="right">   A Vary header field-value of "*" always fails to match, and</td><td class="lineno" valign="top"></td></tr>
479      <tr><td class="lineno" valign="top"></td><td class="left">   subsequent requests to that resource can only be properly interpreted</td><td> </td><td class="right">   subsequent requests to that resource can only be properly interpreted</td><td class="lineno" valign="top"></td></tr>
480      <tr><td class="lineno" valign="top"></td><td class="left">   by the origin server.</td><td> </td><td class="right">   by the origin server.</td><td class="lineno" valign="top"></td></tr>
481      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
482      <tr><td class="lineno" valign="top"></td><td class="left">   The stored response with matching selecting request-headers is known</td><td> </td><td class="right">   The stored response with matching selecting request-headers is known</td><td class="lineno" valign="top"></td></tr>
483      <tr><td class="lineno" valign="top"></td><td class="left">   as the selected response.</td><td> </td><td class="right">   as the selected response.</td><td class="lineno" valign="top"></td></tr>
484      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
485      <tr><td class="lineno" valign="top"></td><td class="left">   If no selected response is available, the cache MAY forward the</td><td> </td><td class="right">   If no selected response is available, the cache MAY forward the</td><td class="lineno" valign="top"></td></tr>
486      <tr><td class="lineno" valign="top"></td><td class="left">   presented request to the origin server in a conditional request; see</td><td> </td><td class="right">   presented request to the origin server in a conditional request; see</td><td class="lineno" valign="top"></td></tr>
487      <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>
488      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
489      <tr><td class="lineno" valign="top"></td><td class="left">2.8.  Combining Responses</td><td> </td><td class="right">2.8.  Combining Responses</td><td class="lineno" valign="top"></td></tr>
490      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
491      <tr><td class="lineno" valign="top"></td><td class="left">   When a cache receives a 304 (Not Modified) response or a 206 (Partial</td><td> </td><td class="right">   When a cache receives a 304 (Not Modified) response or a 206 (Partial</td><td class="lineno" valign="top"></td></tr>
492      <tr><td class="lineno" valign="top"></td><td class="left">   Content) response (in this section, the "new" response"), it needs to</td><td> </td><td class="right">   Content) response (in this section, the "new" response"), it needs to</td><td class="lineno" valign="top"></td></tr>
493      <tr><td class="lineno" valign="top"></td><td class="left">   created an updated response by combining the stored response with the</td><td> </td><td class="right">   created an updated response by combining the stored response with the</td><td class="lineno" valign="top"></td></tr>
494      <tr><td class="lineno" valign="top"></td><td class="left">   new one, so that the updated response can be used to satisfy the</td><td> </td><td class="right">   new one, so that the updated response can be used to satisfy the</td><td class="lineno" valign="top"></td></tr>
495      <tr><td><a name="diff0031" /></td></tr>
496      <tr><td class="lineno" valign="top"></td><td class="lblock">   request.</td><td> </td><td class="rblock">   request<span class="insert">, and potentially update the cached response</span>.</td><td class="lineno" valign="top"></td></tr>
497      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
498      <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>
499      <tr><td><a name="diff0032" /></td></tr>
500      <tr><td class="lineno" valign="top"></td><td class="lblock">   response to use.  [[TODO-mention-CL: <span class="delete">may</span> need language about <span class="delete">Content-</span></td><td> </td><td class="rblock">   response to use.  [[TODO-mention-CL: <span class="insert">might</span> need language about</td><td class="lineno" valign="top"></td></tr>
501      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Location here]][[TODO-inm-mult-etags: cover case where INM with</span></td><td> </td><td class="rblock">   <span class="insert">Content-Location here]][[TODO-select-for-combine: Shouldn't this be</span></td><td class="lineno" valign="top"></td></tr>
502      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   multiple etags was sent]]</span></td><td> </td><td class="rblock"><span class="insert">   the selected response?]]</span></td><td class="lineno" valign="top"></td></tr>
503      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
504      <tr><td><a name="diff0033" /></td></tr>
505      <tr><td class="lineno" valign="top"></td><td class="lblock">   If the status code is 206 (partial content), both the stored and new</td><td> </td><td class="rblock">   If the <span class="insert">new response's</span> status code is 206 (partial content), both the</td><td class="lineno" valign="top"></td></tr>
506      <tr><td class="lineno" valign="top"></td><td class="lblock">   responses MUST have validators, and those validators MUST match using</td><td> </td><td class="rblock">   stored and new responses MUST have validators, and those validators</td><td class="lineno" valign="top"></td></tr>
507      <tr><td class="lineno" valign="top"></td><td class="lblock">   the strong comparison function (see Section 4 of [Part4]).</td><td> </td><td class="rblock">   MUST match using the strong comparison function (see Section 4 of</td><td class="lineno" valign="top"></td></tr>
508      <tr><td class="lineno" valign="top"></td><td class="lblock">   Otherwise, the responses MUST NOT be combined.</td><td> </td><td class="rblock">   [Part4]).  Otherwise, the responses MUST NOT be combined.</td><td class="lineno" valign="top"></td></tr>
509      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
510      <tr><td class="lineno" valign="top"></td><td class="left">   The stored response headers are used as those of the updated</td><td> </td><td class="right">   The stored response headers are used as those of the updated</td><td class="lineno" valign="top"></td></tr>
511      <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>
512      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
513      <tr><td class="lineno" valign="top"></td><td class="left">   o  any stored Warning headers with warn-code 1xx (see Section 3.6)</td><td> </td><td class="right">   o  any stored Warning headers with warn-code 1xx (see Section 3.6)</td><td class="lineno" valign="top"></td></tr>
514      <tr><td><a name="diff0034" /></td></tr>
515      <tr><td class="lineno" valign="top"></td><td class="lblock">      MUST be <span class="delete">deleted from the stored response and the updated response.</span></td><td> </td><td class="rblock">      MUST be <span class="insert">deleted.</span></td><td class="lineno" valign="top"></td></tr>
516      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
517      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   o  any stored Warning headers with warn-code 2xx MUST be retained in</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
518      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">      the stored response and the updated response.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
519      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
520      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   o  any headers provided in the new response MUST replace the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
521      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">      corresponding headers from the stored response.</span></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"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
523      <tr><td><a name="diff0035" /></td></tr>
524      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">If a header field-name in the new response matches more than one</span></td><td> </td><td class="rblock">   <span class="insert">o  any</span> stored <span class="insert">Warning</span> headers <span class="insert">with warn-code 2xx</span> MUST be <span class="insert">retained.</span></td><td class="lineno" valign="top"></td></tr>
525      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   header in the stored response, all such</span> stored headers MUST be</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
526      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">replaced.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
527      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
528      <tr><td><a name="diff0036" /></td></tr>
529      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">The updated response can [[TODO-is-req: requirement?]] be used to</span></td><td> </td><td class="rblock">   <span class="insert">o  any other headers provided</span> in the <span class="insert">new response MUST replace all</span></td><td class="lineno" valign="top"></td></tr>
530      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   replace the stored response</span> in <span class="delete">cache.  In</span> the <span class="delete">case</span> of <span class="delete">a 206 response,</span></td><td> </td><td class="rblock"><span class="insert">      instances</span> of the <span class="insert">corresponding headers from the stored response.</span></td><td class="lineno" valign="top"></td></tr>
531      <tr><td class="lineno" valign="top"></td><td class="lblock">   the <span class="delete">combined entity-body MAY be stored.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
532      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
533      <tr><td><a name="diff0037" /></td></tr>
534      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">[[ISSUE-how-head: discuss how</span> to <span class="delete">handle HEAD updates]]</span></td><td> </td><td class="rblock">   <span class="insert">The updated response headers MUST be used</span> to <span class="insert">replace those of the</span></td><td class="lineno" valign="top"></td></tr>
535      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   stored response in cache (unless the stored response is removed from</span></td><td class="lineno" valign="top"></td></tr>
536      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   cache).  In the case of a 206 response, the combined representation</span></td><td class="lineno" valign="top"></td></tr>
537      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   MAY be stored.</span></td><td class="lineno" valign="top"></td></tr>
538      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
539      <tr><td class="lineno" valign="top"></td><td class="left">3.  Header Field Definitions</td><td> </td><td class="right">3.  Header Field Definitions</td><td class="lineno" valign="top"></td></tr>
540      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
541      <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>
542      <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>
543      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
544      <tr><td><a name="diff0038" /></td></tr>
545      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">For entity-header fields, both sender and recipient refer to either</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
546      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   the client or the server, depending on who sends and who receives the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
547      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   entity.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
548      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                                         </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
549      <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>
550      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
551      <tr><td class="lineno" valign="top"></td><td class="left">   The "Age" response-header field conveys the sender's estimate of the</td><td> </td><td class="right">   The "Age" response-header field conveys the sender's estimate of the</td><td class="lineno" valign="top"></td></tr>
552      <tr><td class="lineno" valign="top"></td><td class="left">   amount of time since the response was generated or successfully</td><td> </td><td class="right">   amount of time since the response was generated or successfully</td><td class="lineno" valign="top"></td></tr>
553      <tr><td class="lineno" valign="top"></td><td class="left">   validated at the origin server.  Age values are calculated as</td><td> </td><td class="right">   validated at the origin server.  Age values are calculated as</td><td class="lineno" valign="top"></td></tr>
554      <tr><td class="lineno" valign="top"></td><td class="left">   specified in Section 2.3.2.</td><td> </td><td class="right">   specified in Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
555      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
556      <tr><td class="lineno" valign="top"></td><td class="left">     Age   = "Age" ":" OWS Age-v</td><td> </td><td class="right">     Age   = "Age" ":" OWS Age-v</td><td class="lineno" valign="top"></td></tr>
557      <tr><td class="lineno" valign="top"></td><td class="left">     Age-v = delta-seconds</td><td> </td><td class="right">     Age-v = delta-seconds</td><td class="lineno" valign="top"></td></tr>
558      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
559      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
560      <tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 18, line 18</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 18, line 4</em></th><td></td></tr>
561      <tr><td class="lineno" valign="top"></td><td class="left">     Age-v = delta-seconds</td><td> </td><td class="right">     Age-v = delta-seconds</td><td class="lineno" valign="top"></td></tr>
562      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
563      <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>
564      <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>
565      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
566      <tr><td 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>
567      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
568      <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>
569      <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>
570      <tr><td class="lineno" valign="top"></td><td class="left">   MUST transmit an Age header with a field-value of 2147483648 (2^31).</td><td> </td><td class="right">   MUST transmit an Age header with a field-value of 2147483648 (2^31).</td><td class="lineno" valign="top"></td></tr>
571      <tr><td><a name="diff0039" /></td></tr>
572      <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>
573      <tr><td class="lineno" valign="top"></td><td class="left">   Caches SHOULD use an arithmetic type of at least 31 bits of range.</td><td> </td><td class="right">   Caches SHOULD use an arithmetic type of at least 31 bits of range.</td><td class="lineno" valign="top"></td></tr>
574      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
575      <tr><td class="lineno" valign="top"></td><td class="left">   The presence of an Age header field in a response implies that a</td><td> </td><td class="right">   The presence of an Age header field in a response implies that a</td><td class="lineno" valign="top"></td></tr>
576      <tr><td class="lineno" valign="top"></td><td class="left">   response is not first-hand.  However, the converse is not true, since</td><td> </td><td class="right">   response is not first-hand.  However, the converse is not true, since</td><td class="lineno" valign="top"></td></tr>
577      <tr><td><a name="diff0040" /></td></tr>
578      <tr><td class="lineno" valign="top"></td><td class="lblock">   HTTP/1.0 caches m<span class="delete">ay</span> not implement the Age header field.</td><td> </td><td class="rblock">   HTTP/1.0 caches m<span class="insert">ight</span> not implement the Age header field.</td><td class="lineno" valign="top"></td></tr>
579      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
580      <tr><td class="lineno" valign="top"></td><td class="left">3.2.  Cache-Control</td><td> </td><td class="right">3.2.  Cache-Control</td><td class="lineno" valign="top"></td></tr>
581      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
582      <tr><td class="lineno" valign="top"></td><td class="left">   The "Cache-Control" general-header field is used to specify</td><td> </td><td class="right">   The "Cache-Control" general-header field is used to specify</td><td class="lineno" valign="top"></td></tr>
583      <tr><td class="lineno" valign="top"></td><td class="left">   directives for caches along the request/response chain.  Such cache</td><td> </td><td class="right">   directives for caches along the request/response chain.  Such cache</td><td class="lineno" valign="top"></td></tr>
584      <tr><td class="lineno" valign="top"></td><td class="left">   directives are unidirectional in that the presence of a directive in</td><td> </td><td class="right">   directives are unidirectional in that the presence of a directive in</td><td class="lineno" valign="top"></td></tr>
585      <tr><td class="lineno" valign="top"></td><td class="left">   a request does not imply that the same directive is to be given in</td><td> </td><td class="right">   a request does not imply that the same directive is to be given in</td><td class="lineno" valign="top"></td></tr>
586      <tr><td class="lineno" valign="top"></td><td class="left">   the response.</td><td> </td><td class="right">   the response.</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">   HTTP/1.1 caches MUST obey the requirements of the Cache-Control</td><td> </td><td class="right">   HTTP/1.1 caches MUST obey the requirements of the Cache-Control</td><td class="lineno" valign="top"></td></tr>
589      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
590      <tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 19, line 38</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 19, line 24</em></th><td></td></tr>
591      <tr><td class="lineno" valign="top"></td><td class="left">      store any part of either this request or any response to it.  This</td><td> </td><td class="right">      store any part of either this request or any response to it.  This</td><td class="lineno" valign="top"></td></tr>
592      <tr><td class="lineno" valign="top"></td><td class="left">      directive applies to both non-shared and shared caches.  "MUST NOT</td><td> </td><td class="right">      directive applies to both non-shared and shared caches.  "MUST NOT</td><td class="lineno" valign="top"></td></tr>
593      <tr><td class="lineno" valign="top"></td><td class="left">      store" in this context means that the cache MUST NOT intentionally</td><td> </td><td class="right">      store" in this context means that the cache MUST NOT intentionally</td><td class="lineno" valign="top"></td></tr>
594      <tr><td class="lineno" valign="top"></td><td class="left">      store the information in non-volatile storage, and MUST make a</td><td> </td><td class="right">      store the information in non-volatile storage, and MUST make a</td><td class="lineno" valign="top"></td></tr>
595      <tr><td class="lineno" valign="top"></td><td class="left">      best-effort attempt to remove the information from volatile</td><td> </td><td class="right">      best-effort attempt to remove the information from volatile</td><td class="lineno" valign="top"></td></tr>
596      <tr><td class="lineno" valign="top"></td><td class="left">      storage as promptly as possible after forwarding it.</td><td> </td><td class="right">      storage as promptly as possible after forwarding it.</td><td class="lineno" valign="top"></td></tr>
597      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
598      <tr><td class="lineno" valign="top"></td><td class="left">      This directive is NOT a reliable or sufficient mechanism for</td><td> </td><td class="right">      This directive is NOT a reliable or sufficient mechanism for</td><td class="lineno" valign="top"></td></tr>
599      <tr><td class="lineno" valign="top"></td><td class="left">      ensuring privacy.  In particular, malicious or compromised caches</td><td> </td><td class="right">      ensuring privacy.  In particular, malicious or compromised caches</td><td class="lineno" valign="top"></td></tr>
600      <tr><td class="lineno" valign="top"></td><td class="left">      might not recognize or obey this directive, and communications</td><td> </td><td class="right">      might not recognize or obey this directive, and communications</td><td class="lineno" valign="top"></td></tr>
601      <tr><td><a name="diff0041" /></td></tr>
602      <tr><td class="lineno" valign="top"></td><td class="lblock">      networks m<span class="delete">ay</span> be vulnerable to eavesdropping.</td><td> </td><td class="rblock">      networks m<span class="insert">ight</span> be vulnerable to eavesdropping.</td><td class="lineno" valign="top"></td></tr>
603      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
604      <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>
605      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
606      <tr><td class="lineno" valign="top"></td><td class="left">      The max-age request directive indicates that the client is willing</td><td> </td><td class="right">      The max-age request directive indicates that the client is willing</td><td class="lineno" valign="top"></td></tr>
607      <tr><td class="lineno" valign="top"></td><td class="left">      to accept a response whose age is no greater than the specified</td><td> </td><td class="right">      to accept a response whose age is no greater than the specified</td><td class="lineno" valign="top"></td></tr>
608      <tr><td class="lineno" valign="top"></td><td class="left">      time in seconds.  Unless the max-stale request directive is also</td><td> </td><td class="right">      time in seconds.  Unless the max-stale request directive is also</td><td class="lineno" valign="top"></td></tr>
609      <tr><td class="lineno" valign="top"></td><td class="left">      present, the client is not willing to accept a stale response.</td><td> </td><td class="right">      present, the client is not willing to accept a stale response.</td><td class="lineno" valign="top"></td></tr>
610      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
611      <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>
612      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
613      <tr><td class="lineno" valign="top"></td><td class="left">      The max-stale request directive indicates that the client is</td><td> </td><td class="right">      The max-stale request directive indicates that the client is</td><td class="lineno" valign="top"></td></tr>
614      <tr><td class="lineno" valign="top"></td><td class="left">      willing to accept a response that has exceeded its expiration</td><td> </td><td class="right">      willing to accept a response that has exceeded its expiration</td><td class="lineno" valign="top"></td></tr>
615      <tr><td class="lineno" valign="top"></td><td class="left">      time.  If max-stale is assigned a value, then the client is</td><td> </td><td class="right">      time.  If max-stale is assigned a value, then the client is</td><td class="lineno" valign="top"></td></tr>
616      <tr><td class="lineno" valign="top"></td><td class="left">      willing to accept a response that has exceeded its expiration time</td><td> </td><td class="right">      willing to accept a response that has exceeded its expiration time</td><td class="lineno" valign="top"></td></tr>
617      <tr><td class="lineno" valign="top"></td><td class="left">      by no more than the specified number of seconds.  If no value is</td><td> </td><td class="right">      by no more than the specified number of seconds.  If no value is</td><td class="lineno" valign="top"></td></tr>
618      <tr><td class="lineno" valign="top"></td><td class="left">      assigned to max-stale, then the client is willing to accept a</td><td> </td><td class="right">      assigned to max-stale, then the client is willing to accept a</td><td class="lineno" valign="top"></td></tr>
619      <tr><td><a name="diff0042" /></td></tr>
620      <tr><td class="lineno" valign="top"></td><td class="lblock">      stale response of any age.  <span class="delete">[[TODO-staleness: of any staleness?</span></td><td> </td><td class="rblock">      stale response of any age.</td><td class="lineno" valign="top"></td></tr>
621      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">      --mnot]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
622      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
623      <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>
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">      The min-fresh request directive indicates that the client is</td><td> </td><td class="right">      The min-fresh request directive indicates that the client is</td><td class="lineno" valign="top"></td></tr>
626      <tr><td class="lineno" valign="top"></td><td class="left">      willing to accept a response whose freshness lifetime is no less</td><td> </td><td class="right">      willing to accept a response whose freshness lifetime is no less</td><td class="lineno" valign="top"></td></tr>
627      <tr><td class="lineno" valign="top"></td><td class="left">      than its current age plus the specified time in seconds.  That is,</td><td> </td><td class="right">      than its current age plus the specified time in seconds.  That is,</td><td class="lineno" valign="top"></td></tr>
628      <tr><td class="lineno" valign="top"></td><td class="left">      the client wants a response that will still be fresh for at least</td><td> </td><td class="right">      the client wants a response that will still be fresh for at least</td><td class="lineno" valign="top"></td></tr>
629      <tr><td class="lineno" valign="top"></td><td class="left">      the specified number of seconds.</td><td> </td><td class="right">      the specified number of seconds.</td><td class="lineno" valign="top"></td></tr>
630      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
631      <tr><td class="lineno" valign="top"></td><td class="left">   no-transform</td><td> </td><td class="right">   no-transform</td><td class="lineno" valign="top"></td></tr>
632      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
633      <tr><td class="lineno" valign="top"></td><td class="left">      The no-transform request directive indicates that an intermediate</td><td> </td><td class="right">      The no-transform request directive indicates that an intermediate</td><td class="lineno" valign="top"></td></tr>
634      <tr><td class="lineno" valign="top"></td><td class="left">      cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td> </td><td class="right">      cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td class="lineno" valign="top"></td></tr>
635      <tr><td><a name="diff0043" /></td></tr>
636      <tr><td class="lineno" valign="top"></td><td class="lblock">      or Content-Type request headers, nor the request <span class="delete">entity-body</span>.</td><td> </td><td class="rblock">      or Content-Type request headers, nor the request <span class="insert">representation</span>.</td><td class="lineno" valign="top"></td></tr>
637      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
638      <tr><td class="lineno" valign="top"></td><td class="left">   only-if-cached</td><td> </td><td class="right">   only-if-cached</td><td class="lineno" valign="top"></td></tr>
639      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
640      <tr><td class="lineno" valign="top"></td><td class="left">      The only-if-cached request directive indicates that the client</td><td> </td><td class="right">      The only-if-cached request directive indicates that the client</td><td class="lineno" valign="top"></td></tr>
641      <tr><td class="lineno" valign="top"></td><td class="left">      only wishes to return a stored response.  If it receives this</td><td> </td><td class="right">      only wishes to return a stored response.  If it receives this</td><td class="lineno" valign="top"></td></tr>
642      <tr><td class="lineno" valign="top"></td><td class="left">      directive, a cache SHOULD either respond using a stored response</td><td> </td><td class="right">      directive, a cache SHOULD either respond using a stored response</td><td class="lineno" valign="top"></td></tr>
643      <tr><td class="lineno" valign="top"></td><td class="left">      that is consistent with the other constraints of the request, or</td><td> </td><td class="right">      that is consistent with the other constraints of the request, or</td><td class="lineno" valign="top"></td></tr>
644      <tr><td><a name="diff0044" /></td></tr>
645      <tr><td class="lineno" valign="top"></td><td class="lblock">      respond with a 504 (Gateway Timeout) <span class="delete">status.</span>  If a group of caches</td><td> </td><td class="rblock">      respond with a 504 (Gateway Timeout) <span class="insert">status code.</span>  If a group of</td><td class="lineno" valign="top"></td></tr>
646      <tr><td class="lineno" valign="top"></td><td class="lblock">      is being operated as a unified system with good internal</td><td> </td><td class="rblock">      caches is being operated as a unified system with good internal</td><td class="lineno" valign="top"></td></tr>
647      <tr><td class="lineno" valign="top"></td><td class="left">      connectivity, such a request MAY be forwarded within that group of</td><td> </td><td class="right">      connectivity, such a request MAY be forwarded within that group of</td><td class="lineno" valign="top"></td></tr>
648      <tr><td class="lineno" valign="top"></td><td class="left">      caches.</td><td> </td><td class="right">      caches.</td><td class="lineno" valign="top"></td></tr>
649      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
650      <tr><td class="lineno" valign="top"></td><td class="left">3.2.2.  Response Cache-Control Directives</td><td> </td><td class="right">3.2.2.  Response Cache-Control Directives</td><td class="lineno" valign="top"></td></tr>
651      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
652      <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>
653      <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>
654      <tr><td class="lineno" valign="top"></td><td class="left">        / "private" [ "=" DQUOTE 1#field-name DQUOTE ]</td><td> </td><td class="right">        / "private" [ "=" DQUOTE 1#field-name DQUOTE ]</td><td class="lineno" valign="top"></td></tr>
655      <tr><td class="lineno" valign="top"></td><td class="left">        / "no-cache" [ "=" DQUOTE 1#field-name DQUOTE ]</td><td> </td><td class="right">        / "no-cache" [ "=" DQUOTE 1#field-name DQUOTE ]</td><td class="lineno" valign="top"></td></tr>
656      <tr><td class="lineno" valign="top"></td><td class="left">        / "no-store"</td><td> </td><td class="right">        / "no-store"</td><td class="lineno" valign="top"></td></tr>
657      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
658      <tr bgcolor="gray" ><td></td><th><a name="part-l12" /><small>skipping to change at</small><em> page 21, line 20</em></th><th> </th><th><a name="part-r12" /><small>skipping to change at</small><em> page 21, line 7</em></th><td></td></tr>
659      <tr><td class="lineno" valign="top"></td><td class="left">      is intended for a single user and MUST NOT be stored by a shared</td><td> </td><td class="right">      is intended for a single user and MUST NOT be stored by a shared</td><td class="lineno" valign="top"></td></tr>
660      <tr><td class="lineno" valign="top"></td><td class="left">      cache.  A private (non-shared) cache MAY store the response.</td><td> </td><td class="right">      cache.  A private (non-shared) cache MAY store the response.</td><td class="lineno" valign="top"></td></tr>
661      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
662      <tr><td class="lineno" valign="top"></td><td class="left">      If the private response directive specifies one or more field-</td><td> </td><td class="right">      If the private response directive specifies one or more field-</td><td class="lineno" valign="top"></td></tr>
663      <tr><td class="lineno" valign="top"></td><td class="left">      names, this requirement is limited to the field-values associated</td><td> </td><td class="right">      names, this requirement is limited to the field-values associated</td><td class="lineno" valign="top"></td></tr>
664      <tr><td class="lineno" valign="top"></td><td class="left">      with the listed response headers.  That is, the specified field-</td><td> </td><td class="right">      with the listed response headers.  That is, the specified field-</td><td class="lineno" valign="top"></td></tr>
665      <tr><td class="lineno" valign="top"></td><td class="left">      names(s) MUST NOT be stored by a shared cache, whereas the</td><td> </td><td class="right">      names(s) MUST NOT be stored by a shared cache, whereas the</td><td class="lineno" valign="top"></td></tr>
666      <tr><td class="lineno" valign="top"></td><td class="left">      remainder of the response message MAY be.</td><td> </td><td class="right">      remainder of the response message MAY be.</td><td class="lineno" valign="top"></td></tr>
667      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
668      <tr><td class="lineno" valign="top"></td><td class="left">      Note: This usage of the word private only controls where the</td><td> </td><td class="right">      Note: This usage of the word private only controls where the</td><td class="lineno" valign="top"></td></tr>
669      <tr><td><a name="diff0045" /></td></tr>
670      <tr><td class="lineno" valign="top"></td><td class="lblock">      response <span class="delete">may be stored, and</span> cannot ensure the privacy of the</td><td> </td><td class="rblock">      response <span class="insert">can be stored; it</span> cannot ensure the privacy of the</td><td class="lineno" valign="top"></td></tr>
671      <tr><td class="lineno" valign="top"></td><td class="left">      message content.  Also, private response directives with field-</td><td> </td><td class="right">      message content.  Also, private response directives with field-</td><td class="lineno" valign="top"></td></tr>
672      <tr><td class="lineno" valign="top"></td><td class="left">      names are often handled by implementations as if an unqualified</td><td> </td><td class="right">      names are often handled by implementations as if an unqualified</td><td class="lineno" valign="top"></td></tr>
673      <tr><td class="lineno" valign="top"></td><td class="left">      private directive was received; i.e., the special handling for the</td><td> </td><td class="right">      private directive was received; i.e., the special handling for the</td><td class="lineno" valign="top"></td></tr>
674      <tr><td class="lineno" valign="top"></td><td class="left">      qualified form is not widely implemented.</td><td> </td><td class="right">      qualified form is not widely implemented.</td><td class="lineno" valign="top"></td></tr>
675      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
676      <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>
677      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
678      <tr><td class="lineno" valign="top"></td><td class="left">      The no-cache response directive indicates that the response MUST</td><td> </td><td class="right">      The no-cache response directive indicates that the response MUST</td><td class="lineno" valign="top"></td></tr>
679      <tr><td class="lineno" valign="top"></td><td class="left">      NOT be used to satisfy a subsequent request without successful</td><td> </td><td class="right">      NOT be used to satisfy a subsequent request without successful</td><td class="lineno" valign="top"></td></tr>
680      <tr><td class="lineno" valign="top"></td><td class="left">      validation on the origin server.  This allows an origin server to</td><td> </td><td class="right">      validation on the origin server.  This allows an origin server to</td><td class="lineno" valign="top"></td></tr>
681      <tr><td><a name="diff0046" /></td></tr>
682      <tr><td class="lineno" valign="top"></td><td class="lblock">      prevent <span class="delete">caching</span> even by caches that have been configured to return</td><td> </td><td class="rblock">      prevent <span class="insert">a cache from using it to satisfy a request without</span></td><td class="lineno" valign="top"></td></tr>
683      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      contacting it,</span> even by caches that have been configured to return</td><td class="lineno" valign="top"></td></tr>
684      <tr><td class="lineno" valign="top"></td><td class="left">      stale responses.</td><td> </td><td class="right">      stale responses.</td><td class="lineno" valign="top"></td></tr>
685      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
686      <tr><td class="lineno" valign="top"></td><td class="left">      If the no-cache response directive specifies one or more field-</td><td> </td><td class="right">      If the no-cache response directive specifies one or more field-</td><td class="lineno" valign="top"></td></tr>
687      <tr><td class="lineno" valign="top"></td><td class="left">      names, this requirement is limited to the field-values associated</td><td> </td><td class="right">      names, this requirement is limited to the field-values associated</td><td class="lineno" valign="top"></td></tr>
688      <tr><td class="lineno" valign="top"></td><td class="left">      with the listed response headers.  That is, the specified field-</td><td> </td><td class="right">      with the listed response headers.  That is, the specified field-</td><td class="lineno" valign="top"></td></tr>
689      <tr><td class="lineno" valign="top"></td><td class="left">      name(s) MUST NOT be sent in the response to a subsequent request</td><td> </td><td class="right">      name(s) MUST NOT be sent in the response to a subsequent request</td><td class="lineno" valign="top"></td></tr>
690      <tr><td class="lineno" valign="top"></td><td class="left">      without successful validation on the origin server.  This allows</td><td> </td><td class="right">      without successful validation on the origin server.  This allows</td><td class="lineno" valign="top"></td></tr>
691      <tr><td class="lineno" valign="top"></td><td class="left">      an origin server to prevent the re-use of certain header fields in</td><td> </td><td class="right">      an origin server to prevent the re-use of certain header fields in</td><td class="lineno" valign="top"></td></tr>
692      <tr><td class="lineno" valign="top"></td><td class="left">      a response, while still allowing caching of the rest of the</td><td> </td><td class="right">      a response, while still allowing caching of the rest of the</td><td class="lineno" valign="top"></td></tr>
693      <tr><td class="lineno" valign="top"></td><td class="left">      response.</td><td> </td><td class="right">      response.</td><td class="lineno" valign="top"></td></tr>
694      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
695      <tr bgcolor="gray" ><td></td><th><a name="part-l13" /><small>skipping to change at</small><em> page 22, line 18</em></th><th> </th><th><a name="part-r13" /><small>skipping to change at</small><em> page 21, line 50</em></th><td></td></tr>
696      <tr><td class="lineno" valign="top"></td><td class="left">      store any part of either the immediate request or response.  This</td><td> </td><td class="right">      store any part of either the immediate request or response.  This</td><td class="lineno" valign="top"></td></tr>
697      <tr><td class="lineno" valign="top"></td><td class="left">      directive applies to both non-shared and shared caches.  "MUST NOT</td><td> </td><td class="right">      directive applies to both non-shared and shared caches.  "MUST NOT</td><td class="lineno" valign="top"></td></tr>
698      <tr><td class="lineno" valign="top"></td><td class="left">      store" in this context means that the cache MUST NOT intentionally</td><td> </td><td class="right">      store" in this context means that the cache MUST NOT intentionally</td><td class="lineno" valign="top"></td></tr>
699      <tr><td class="lineno" valign="top"></td><td class="left">      store the information in non-volatile storage, and MUST make a</td><td> </td><td class="right">      store the information in non-volatile storage, and MUST make a</td><td class="lineno" valign="top"></td></tr>
700      <tr><td class="lineno" valign="top"></td><td class="left">      best-effort attempt to remove the information from volatile</td><td> </td><td class="right">      best-effort attempt to remove the information from volatile</td><td class="lineno" valign="top"></td></tr>
701      <tr><td class="lineno" valign="top"></td><td class="left">      storage as promptly as possible after forwarding it.</td><td> </td><td class="right">      storage as promptly as possible after forwarding it.</td><td class="lineno" valign="top"></td></tr>
702      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
703      <tr><td class="lineno" valign="top"></td><td class="left">      This directive is NOT a reliable or sufficient mechanism for</td><td> </td><td class="right">      This directive is NOT a reliable or sufficient mechanism for</td><td class="lineno" valign="top"></td></tr>
704      <tr><td class="lineno" valign="top"></td><td class="left">      ensuring privacy.  In particular, malicious or compromised caches</td><td> </td><td class="right">      ensuring privacy.  In particular, malicious or compromised caches</td><td class="lineno" valign="top"></td></tr>
705      <tr><td class="lineno" valign="top"></td><td class="left">      might not recognize or obey this directive, and communications</td><td> </td><td class="right">      might not recognize or obey this directive, and communications</td><td class="lineno" valign="top"></td></tr>
706      <tr><td><a name="diff0047" /></td></tr>
707      <tr><td class="lineno" valign="top"></td><td class="lblock">      networks m<span class="delete">ay</span> be vulnerable to eavesdropping.</td><td> </td><td class="rblock">      networks m<span class="insert">ight</span> be vulnerable to eavesdropping.</td><td class="lineno" valign="top"></td></tr>
708      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
709      <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>
710      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
711      <tr><td class="lineno" valign="top"></td><td class="left">      The must-revalidate response directive indicates that once it has</td><td> </td><td class="right">      The must-revalidate response directive indicates that once it has</td><td class="lineno" valign="top"></td></tr>
712      <tr><td class="lineno" valign="top"></td><td class="left">      become stale, the response MUST NOT be used to satisfy subsequent</td><td> </td><td class="right">      become stale, the response MUST NOT be used to satisfy subsequent</td><td class="lineno" valign="top"></td></tr>
713      <tr><td class="lineno" valign="top"></td><td class="left">      requests without successful validation on the origin server.</td><td> </td><td class="right">      requests without successful validation on the origin server.</td><td class="lineno" valign="top"></td></tr>
714      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
715      <tr><td class="lineno" valign="top"></td><td class="left">      The must-revalidate directive is necessary to support reliable</td><td> </td><td class="right">      The must-revalidate directive is necessary to support reliable</td><td class="lineno" valign="top"></td></tr>
716      <tr><td class="lineno" valign="top"></td><td class="left">      operation for certain protocol features.  In all circumstances an</td><td> </td><td class="right">      operation for certain protocol features.  In all circumstances an</td><td class="lineno" valign="top"></td></tr>
717      <tr><td class="lineno" valign="top"></td><td class="left">      HTTP/1.1 cache MUST obey the must-revalidate directive; in</td><td> </td><td class="right">      HTTP/1.1 cache MUST obey the must-revalidate directive; in</td><td class="lineno" valign="top"></td></tr>
718      <tr><td class="lineno" valign="top"></td><td class="left">      particular, if the cache cannot reach the origin server for any</td><td> </td><td class="right">      particular, if the cache cannot reach the origin server for any</td><td class="lineno" valign="top"></td></tr>
719      <tr><td class="lineno" valign="top"></td><td class="left">      reason, it MUST generate a 504 (Gateway Timeout) response.</td><td> </td><td class="right">      reason, it MUST generate a 504 (Gateway Timeout) response.</td><td class="lineno" valign="top"></td></tr>
720      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
721      <tr><td class="lineno" valign="top"></td><td class="left">      Servers SHOULD send the must-revalidate directive if and only if</td><td> </td><td class="right">      Servers SHOULD send the must-revalidate directive if and only if</td><td class="lineno" valign="top"></td></tr>
722      <tr><td><a name="diff0048" /></td></tr>
723      <tr><td class="lineno" valign="top"></td><td class="lblock">      failure to validate a request on the <span class="delete">entity</span> could result in</td><td> </td><td class="rblock">      failure to validate a request on the <span class="insert">representation</span> could result</td><td class="lineno" valign="top"></td></tr>
724      <tr><td class="lineno" valign="top"></td><td class="lblock">      incorrect operation, such as a silently unexecuted financial</td><td> </td><td class="rblock">      in incorrect operation, such as a silently unexecuted financial</td><td class="lineno" valign="top"></td></tr>
725      <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>
726      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
727      <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>
728      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
729      <tr><td class="lineno" valign="top"></td><td class="left">      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>
730      <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>
731      <tr><td class="lineno" valign="top"></td><td class="left">      apply to non-shared caches.</td><td> </td><td class="right">      apply to non-shared caches.</td><td class="lineno" valign="top"></td></tr>
732      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
733      <tr><td class="lineno" valign="top"></td><td class="left">   max-age</td><td> </td><td class="right">   max-age</td><td class="lineno" valign="top"></td></tr>
734      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
735      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
736      <tr bgcolor="gray" ><td></td><th><a name="part-l14" /><small>skipping to change at</small><em> page 23, line 12</em></th><th> </th><th><a name="part-r14" /><small>skipping to change at</small><em> page 22, line 46</em></th><td></td></tr>
737      <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>
738      <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>
739      <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>
740      <tr><td class="lineno" valign="top"></td><td class="left">      header.  The s-maxage directive also implies the semantics of the</td><td> </td><td class="right">      header.  The s-maxage directive also implies the semantics of the</td><td class="lineno" valign="top"></td></tr>
741      <tr><td class="lineno" valign="top"></td><td class="left">      proxy-revalidate response directive.</td><td> </td><td class="right">      proxy-revalidate response directive.</td><td class="lineno" valign="top"></td></tr>
742      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
743      <tr><td class="lineno" valign="top"></td><td class="left">   no-transform</td><td> </td><td class="right">   no-transform</td><td class="lineno" valign="top"></td></tr>
744      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
745      <tr><td class="lineno" valign="top"></td><td class="left">      The no-transform response directive indicates that an intermediate</td><td> </td><td class="right">      The no-transform response directive indicates that an intermediate</td><td class="lineno" valign="top"></td></tr>
746      <tr><td class="lineno" valign="top"></td><td class="left">      cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td> </td><td class="right">      cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td class="lineno" valign="top"></td></tr>
747      <tr><td><a name="diff0049" /></td></tr>
748      <tr><td class="lineno" valign="top"></td><td class="lblock">      or Content-Type response headers, nor the response <span class="delete">entity-body</span>.</td><td> </td><td class="rblock">      or Content-Type response headers, nor the response <span class="insert">representation</span>.</td><td class="lineno" valign="top"></td></tr>
749      <tr><