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38	<tr bgcolor="orange"><th></th><th> draft-ietf-httpbis-p6-cache-20.txt </th><th> </th><th> draft-ietf-httpbis-p6-cache-21.txt </th><th></th></tr>
39	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
40	<tr><td class="lineno" valign="top"></td><td class="left">HTTPbis Working Group R. Fielding, Ed.</td><td> </td><td class="right">HTTPbis Working Group R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
41	<tr><td class="lineno" valign="top"></td><td class="left">Internet-Draft Adobe</td><td> </td><td class="right">Internet-Draft Adobe</td><td class="lineno" valign="top"></td></tr>
42	<tr><td><a name="diff0001" /></td></tr>
43	<tr><td class="lineno" valign="top"></td><td class="lblock">Obsoletes: 2616 (if approved) <span class="delete">Y. Lafon,</span> Ed.</td><td> </td><td class="rblock">Obsoletes: 2616 (if approved) <span class="insert">M. Nottingham,</span> Ed.</td><td class="lineno" valign="top"></td></tr>
44	<tr><td class="lineno" valign="top"></td><td class="lblock">Intended status: Standards Track <span class="delete">W3C</span></td><td> </td><td class="rblock">Intended status: Standards Track <span class="insert">Akamai</span></td><td class="lineno" valign="top"></td></tr>
45	<tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">January 17,</span> 2013 <span class="delete">M. Nottingham, Ed.</span></td><td> </td><td class="rblock">Expires: <span class="insert">April 7,</span> 2013 J. Reschke, Ed.</td><td class="lineno" valign="top"></td></tr>
46	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Rackspace</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
47	<tr><td class="lineno" valign="top"></td><td class="lblock"> J. Reschke, Ed.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
48	<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>
49	<tr><td><a name="diff0002" /></td></tr>
50	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete"> July 16</span>, 2012</td><td> </td><td class="rblock"> <span class="insert">October 4</span>, 2012</td><td class="lineno" valign="top"></td></tr>
51	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
52	<tr><td><a name="diff0003" /></td></tr>
53	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">HTTP/1.1, part 6:</span> Caching</td><td> </td><td class="rblock"> <span class="insert">Hypertext Transfer Protocol (HTTP/1.1):</span> Caching</td><td class="lineno" valign="top"></td></tr>
54	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">draft-ietf-httpbis-p6-cache-20</span></td><td> </td><td class="rblock"> <span class="insert">draft-ietf-httpbis-p6-cache-21</span></td><td class="lineno" valign="top"></td></tr>
55	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
56	<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>
57	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
58	<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>
59	<tr><td class="lineno" valign="top"></td><td class="left"> protocol for distributed, collaborative, hypertext information</td><td> </td><td class="right"> protocol for distributed, collaborative, hypertext information</td><td class="lineno" valign="top"></td></tr>
60	<tr><td class="lineno" valign="top"></td><td class="left"> systems. This document defines requirements on HTTP caches and the</td><td> </td><td class="right"> systems. This document defines requirements on HTTP caches and the</td><td class="lineno" valign="top"></td></tr>
61	<tr><td class="lineno" valign="top"></td><td class="left"> associated header fields that control cache behavior or indicate</td><td> </td><td class="right"> associated header fields that control cache behavior or indicate</td><td class="lineno" valign="top"></td></tr>
62	<tr><td class="lineno" valign="top"></td><td class="left"> cacheable response messages.</td><td> </td><td class="right"> cacheable response messages.</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">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>
65	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
66	<tr><td class="lineno" valign="top"></td><td class="left"> Discussion of this draft takes place on the HTTPBIS working group</td><td> </td><td class="right"> Discussion of this draft takes place on the HTTPBIS working group</td><td class="lineno" valign="top"></td></tr>
67	<tr><td class="lineno" valign="top"></td><td class="left"> mailing list (ietf-http-wg@w3.org), which is archived at</td><td> </td><td class="right"> mailing list (ietf-http-wg@w3.org), which is archived at</td><td class="lineno" valign="top"></td></tr>
68	<tr><td class="lineno" valign="top"></td><td class="left"> <http://lists.w3.org/Archives/Public/ietf-http-wg/>.</td><td> </td><td class="right"> <http://lists.w3.org/Archives/Public/ietf-http-wg/>.</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 current issues list is at</td><td> </td><td class="right"> The current issues list is at</td><td class="lineno" valign="top"></td></tr>
71	<tr><td class="lineno" valign="top"></td><td class="left"> <http://tools.ietf.org/wg/httpbis/trac/report/3> and related</td><td> </td><td class="right"> <http://tools.ietf.org/wg/httpbis/trac/report/3> and related</td><td class="lineno" valign="top"></td></tr>
72	<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>
73	<tr><td class="lineno" valign="top"></td><td class="left"> <http://tools.ietf.org/wg/httpbis/>.</td><td> </td><td class="right"> <http://tools.ietf.org/wg/httpbis/>.</td><td class="lineno" valign="top"></td></tr>
74	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
75	<tr><td><a name="diff0004" /></td></tr>
76	<tr><td class="lineno" valign="top"></td><td class="lblock"> The changes in this draft are summarized in Appendix D.<span class="delete">1</span>.</td><td> </td><td class="rblock"> The changes in this draft are summarized in Appendix D.<span class="insert">2</span>.</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">Status of This Memo</td><td> </td><td class="right">Status of This Memo</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"> 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>
81	<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>
82	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
83	<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>
84	<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>
85	<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>
86	<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>
87	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
88	<tr><td class="lineno" valign="top"></td><td class="left"> 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>
89	<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>
90	<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>
91	<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>
92	<tr><td><a name="diff0005" /></td></tr>
93	<tr><td class="lineno" valign="top"></td><td class="lblock"> </td><td> </td><td class="rblock"> This Internet-Draft will expire on <span class="insert">April 7,</span> 2013.</td><td class="lineno" valign="top"></td></tr>
94	<tr><td class="lineno" valign="top"></td><td class="lblock"> This Internet-Draft will expire on <span class="delete">January 17,</span> 2013.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
95	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
96	<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>
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"> Copyright (c) 2012 IETF Trust and the persons identified as the</td><td> </td><td class="right"> Copyright (c) 2012 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
99	<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>
100	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
101	<tr><td class="lineno" valign="top"></td><td class="left"> 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>
102	<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>
103	<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>
104	<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>
105	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
106	<tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 2, line 41</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 2, line 39</em></th><td></td></tr>
107	<tr><td class="lineno" valign="top"></td><td class="left"> not be created outside the IETF Standards Process, except to format</td><td> </td><td class="right"> not be created outside the IETF Standards Process, except to format</td><td class="lineno" valign="top"></td></tr>
108	<tr><td class="lineno" valign="top"></td><td class="left"> it for publication as an RFC or to translate it into languages other</td><td> </td><td class="right"> it for publication as an RFC or to translate it into languages other</td><td class="lineno" valign="top"></td></tr>
109	<tr><td class="lineno" valign="top"></td><td class="left"> than English.</td><td> </td><td class="right"> than English.</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">Table of Contents</td><td> </td><td class="right">Table of Contents</td><td class="lineno" valign="top"></td></tr>
112	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
113	<tr><td class="lineno" valign="top"></td><td class="left"> 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4</td><td> </td><td class="right"> 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4</td><td class="lineno" valign="top"></td></tr>
114	<tr><td class="lineno" valign="top"></td><td class="left"> 1.1. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . 4</td><td> </td><td class="right"> 1.1. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . 4</td><td class="lineno" valign="top"></td></tr>
115	<tr><td class="lineno" valign="top"></td><td class="left"> 1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4</td><td> </td><td class="right"> 1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4</td><td class="lineno" valign="top"></td></tr>
116	<tr><td class="lineno" valign="top"></td><td class="left"> 1.3. Conformance and Error Handling . . . . . . . . . . . . . . 6</td><td> </td><td class="right"> 1.3. Conformance and Error Handling . . . . . . . . . . . . . . 6</td><td class="lineno" valign="top"></td></tr>
117	<tr><td><a name="diff0006" /></td></tr>
118	<tr><td class="lineno" valign="top"></td><td class="lblock"> 1.4. Syntax Notation . . . . . . . . . . . . . . . . . . . . . <span class="delete">7</span></td><td> </td><td class="rblock"> 1.4. Syntax Notation . . . . . . . . . . . . . . . . . . . . . <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
119	<tr><td class="lineno" valign="top"></td><td class="lblock"> 1.4.1. Delta Seconds . . . . . . . . . . . . . . . . . . . . <span class="delete">7</span></td><td> </td><td class="rblock"> 1.4.1. Delta Seconds . . . . . . . . . . . . . . . . . . . . <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
120	<tr><td class="lineno" valign="top"></td><td class="lblock"> 2. Overview of Cache Operation . . . . . . . . . . . . . . . . . <span class="delete">7</span></td><td> </td><td class="rblock"> 2. Overview of Cache Operation . . . . . . . . . . . . . . . . . <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
121	<tr><td class="lineno" valign="top"></td><td class="lblock"> 3. Storing Responses in Caches . . . . . . . . . . . . . . . . . <span class="delete">8</span></td><td> </td><td class="rblock"> 3. Storing Responses in Caches . . . . . . . . . . . . . . . . . <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
122	<tr><td class="lineno" valign="top"></td><td class="lblock"> 3.1. Storing Incomplete Responses . . . . . . . . . . . . . . . <span class="delete">9</span></td><td> </td><td class="rblock"> 3.1. Storing Incomplete Responses . . . . . . . . . . . . . . . <span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
123	<tr><td class="lineno" valign="top"></td><td class="lblock"> 3.2. Storing Responses to Authenticated Requests . . . . . . . <span class="delete">9</span></td><td> </td><td class="rblock"> 3.2. Storing Responses to Authenticated Requests . . . . . . . <span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
124	<tr><td class="lineno" valign="top"></td><td class="lblock"> 4. Constructing Responses from Caches . . . . . . . . . . . . . . <span class="delete">10</span></td><td> </td><td class="rblock"> 4. Constructing Responses from Caches . . . . . . . . . . . . . . <span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
125	<tr><td class="lineno" valign="top"></td><td class="lblock"> 4.1. Freshness Model . . . . . . . . . . . . . . . . . . . . . <span class="delete">11</span></td><td> </td><td class="rblock"> 4.1. Freshness Model . . . . . . . . . . . . . . . . . . . . . <span class="insert">10</span></td><td class="lineno" valign="top"></td></tr>
126	<tr><td class="lineno" valign="top"></td><td class="lblock"> 4.1.1. Calculating Freshness Lifetime . . . . . . . . . . . . <span class="delete">12</span></td><td> </td><td class="rblock"> 4.1.1. Calculating Freshness Lifetime . . . . . . . . . . . . <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
127	<tr><td class="lineno" valign="top"></td><td class="left"> 4.1.2. Calculating Heuristic Freshness . . . . . . . . . . . 12</td><td> </td><td class="right"> 4.1.2. Calculating Heuristic Freshness . . . . . . . . . . . 12</td><td class="lineno" valign="top"></td></tr>
128	<tr><td><a name="diff0007" /></td></tr>
129	<tr><td class="lineno" valign="top"></td><td class="lblock"> 4.1.3. Calculating Age . . . . . . . . . . . . . . . . . . . <span class="delete">13</span></td><td> </td><td class="rblock"> 4.1.3. Calculating Age . . . . . . . . . . . . . . . . . . . <span class="insert">12</span></td><td class="lineno" valign="top"></td></tr>
130	<tr><td class="lineno" valign="top"></td><td class="lblock"> 4.1.4. Serving Stale Responses . . . . . . . . . . . . . . . <span class="delete">15</span></td><td> </td><td class="rblock"> 4.1.4. Serving Stale Responses . . . . . . . . . . . . . . . <span class="insert">14</span></td><td class="lineno" valign="top"></td></tr>
131	<tr><td class="lineno" valign="top"></td><td class="lblock"> 4.2. Validation Model . . . . . . . . . . . . . . . . . . . . . <span class="delete">16</span></td><td> </td><td class="rblock"> 4.2. Validation Model . . . . . . . . . . . . . . . . . . . . . <span class="insert">15</span></td><td class="lineno" valign="top"></td></tr>
132	<tr><td class="lineno" valign="top"></td><td class="left"> 4.2.1. Freshening Responses with 304 Not Modified . . . . . . 16</td><td> </td><td class="right"> 4.2.1. Freshening Responses with 304 Not Modified . . . . . . 16</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"> 4.3. Using Negotiated Responses . . . . . . . . . . . . . . . . <span class="delete">17</span></td><td> </td><td class="rblock"> 4.3. Using Negotiated Responses . . . . . . . . . . . . . . . . <span class="insert">16</span></td><td class="lineno" valign="top"></td></tr>
135	<tr><td class="lineno" valign="top"></td><td class="lblock"> 4.4. Combining Partial Content . . . . . . . . . . . . . . . . <span class="delete">18</span></td><td> </td><td class="rblock"> 4.4. Combining Partial Content . . . . . . . . . . . . . . . . <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
136	<tr><td class="lineno" valign="top"></td><td class="lblock"> 5. Updating Caches with HEAD Responses . . . . . . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock"> 5. Updating Caches with HEAD Responses . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
137	<tr><td class="lineno" valign="top"></td><td class="lblock"> 6. Request Methods that Invalidate . . . . . . . . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock"> 6. Request Methods that Invalidate . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
138	<tr><td class="lineno" valign="top"></td><td class="lblock"> 7. Header Field Definitions . . . . . . . . . . . . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock"> 7. Header Field Definitions . . . . . . . . . . . . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
139	<tr><td class="lineno" valign="top"></td><td class="lblock"> 7.1. Age . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock"> 7.1. Age . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
140	<tr><td class="lineno" valign="top"></td><td class="left"> 7.2. Cache-Control . . . . . . . . . . . . . . . . . . . . . . 20</td><td> </td><td class="right"> 7.2. Cache-Control . . . . . . . . . . . . . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
141	<tr><td><a name="diff0009" /></td></tr>
142	<tr><td class="lineno" valign="top"></td><td class="lblock"> 7.2.1. Request Cache-Control Directives . . . . . . . . . . . <span class="delete">21</span></td><td> </td><td class="rblock"> 7.2.1. Request Cache-Control Directives . . . . . . . . . . . <span class="insert">20</span></td><td class="lineno" valign="top"></td></tr>
143	<tr><td class="lineno" valign="top"></td><td class="lblock"> 7.2.2. Response Cache-Control Directives . . . . . . . . . . <span class="delete">23</span></td><td> </td><td class="rblock"> 7.2.2. Response Cache-Control Directives . . . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
144	<tr><td class="lineno" valign="top"></td><td class="lblock"> 7.2.3. Cache Control Extensions . . . . . . . . . . . . . . . <span class="delete">26</span></td><td> </td><td class="rblock"> 7.2.3. Cache Control Extensions . . . . . . . . . . . . . . . <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
145	<tr><td class="lineno" valign="top"></td><td class="lblock"> 7.3. Expires . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">28</span></td><td> </td><td class="rblock"> 7.3. Expires . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">27</span></td><td class="lineno" valign="top"></td></tr>
146	<tr><td class="lineno" valign="top"></td><td class="left"> 7.4. Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 28</td><td> </td><td class="right"> 7.4. Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 28</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"> 7.5. <span class="delete">Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 29</span></td><td> </td><td class="rblock"> 7.5. Warning . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">28</span></td><td class="lineno" valign="top"></td></tr>
149	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.</span> Warning . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">30</span></td><td> </td><td class="rblock"><span class="insert"> 7.5.1.</span> 110 Response is Stale . . . . . . . . . . . . . . . . <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
150	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.1.</span> 110 Response is Stale . . . . . . . . . . . . . . . . <span class="delete">31</span></td><td> </td><td class="rblock"><span class="insert"> 7.5.2.</span> 111 Revalidation Failed . . . . . . . . . . . . . . . <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
151	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.2.</span> 111 Revalidation Failed . . . . . . . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"><span class="insert"> 7.5.3.</span> 112 Disconnected Operation . . . . . . . . . . . . . . <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
152	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.3.</span> 112 Disconnected Operation . . . . . . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"><span class="insert"> 7.5.4.</span> 113 Heuristic Expiration . . . . . . . . . . . . . . . <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
153	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.4.</span> 113 Heuristic Expiration . . . . . . . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"><span class="insert"> 7.5.5.</span> 199 Miscellaneous Warning . . . . . . . . . . . . . . <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
154	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.5.</span> 199 Miscellaneous Warning . . . . . . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"><span class="insert"> 7.5.6.</span> 214 Transformation Applied . . . . . . . . . . . . . . <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
155	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.6.</span> 214 Transformation Applied . . . . . . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"><span class="insert"> 7.5.7.</span> 299 Miscellaneous Persistent Warning . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
156	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.7.</span> 299 Miscellaneous Persistent Warning . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"><span class="insert"> 7.5.8.</span> Warn Code Extensions . . . . . . . . . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
157	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 7.6.8.</span> Warn Code Extensions . . . . . . . . . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"> 8. History Lists . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
158	<tr><td class="lineno" valign="top"></td><td class="lblock"> 8. History Lists . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">33</span></td><td> </td><td class="rblock"> 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
159	<tr><td class="lineno" valign="top"></td><td class="lblock"> 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . <span class="delete">33</span></td><td> </td><td class="rblock"> 9.1. Cache Directive Registry . . . . . . . . . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
160	<tr><td class="lineno" valign="top"></td><td class="lblock"> 9.1. Cache Directive Registry . . . . . . . . . . . . . . . . . <span class="delete">33</span></td><td> </td><td class="rblock"> 9.2. Warn Code Registry . . . . . . . . . . . . . . . . . . . . <span class="insert">32</span></td><td class="lineno" valign="top"></td></tr>
161	<tr><td class="lineno" valign="top"></td><td class="lblock"> 9.2. Warn Code Registry . . . . . . . . . . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock"> 9.3. Header Field Registration . . . . . . . . . . . . . . . . <span class="insert">33</span></td><td class="lineno" valign="top"></td></tr>
162	<tr><td class="lineno" valign="top"></td><td class="lblock"> 9.3. Header Field Registration . . . . . . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock"> 10. Security Considerations . . . . . . . . . . . . . . . . . . . <span class="insert">33</span></td><td class="lineno" valign="top"></td></tr>
163	<tr><td class="lineno" valign="top"></td><td class="lblock"> 10. Security Considerations . . . . . . . . . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock"> 11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
164	<tr><td class="lineno" valign="top"></td><td class="lblock"> 11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock"> 12. References . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
165	<tr><td class="lineno" valign="top"></td><td class="lblock"> 12. References . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock"> 12.1. Normative References . . . . . . . . . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
166	<tr><td class="lineno" valign="top"></td><td class="lblock"> 12.1. Normative References . . . . . . . . . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock"> 12.2. Informative References . . . . . . . . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
167	<tr><td class="lineno" valign="top"></td><td class="lblock"> 12.2. Informative References . . . . . . . . . . . . . . . . . . <span class="delete">36</span></td><td> </td><td class="rblock"> Appendix A. Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
168	<tr><td class="lineno" valign="top"></td><td class="lblock"> Appendix A. Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="delete">36</span></td><td> </td><td class="rblock"> Appendix B. Imported ABNF . . . . . . . . . . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
169	<tr><td class="lineno" valign="top"></td><td class="lblock"> Appendix B. Imported ABNF . . . . . . . . . . . . . . . . . . . . <span class="delete">37</span></td><td> </td><td class="rblock"> Appendix C. Collected ABNF . . . . . . . . . . . . . . . . . . . <span class="insert">37</span></td><td class="lineno" valign="top"></td></tr>
170	<tr><td class="lineno" valign="top"></td><td class="lblock"> Appendix C. Collected ABNF . . . . . . . . . . . . . . . . . . . <span class="delete">38</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
171	<tr><td class="lineno" valign="top"></td><td class="left"> Appendix D. Change Log (to be removed by RFC Editor before</td><td> </td><td class="right"> Appendix D. Change Log (to be removed by RFC Editor before</td><td class="lineno" valign="top"></td></tr>
172	<tr><td><a name="diff0011" /></td></tr>
173	<tr><td class="lineno" valign="top"></td><td class="lblock"> publication) . . . . . . . . . . . . . . . . . . . . <span class="delete">39</span></td><td> </td><td class="rblock"> publication) . . . . . . . . . . . . . . . . . . . . <span class="insert">38</span></td><td class="lineno" valign="top"></td></tr>
174	<tr><td class="lineno" valign="top"></td><td class="lblock"> D.1. Since draft-ietf-httpbis-p6-cache-19 . . . . . . . . . . . <span class="delete">39</span></td><td> </td><td class="rblock"> D.1. Since draft-ietf-httpbis-p6-cache-19 . . . . . . . . . . . <span class="insert">38</span></td><td class="lineno" valign="top"></td></tr>
175	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> D.2. Since draft-ietf-httpbis-p6-cache-20 . . . . . . . . . . . 38</span></td><td class="lineno" valign="top"></td></tr>
176	<tr><td class="lineno" valign="top"></td><td class="left"> Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39</td><td> </td><td class="right"> Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39</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">1. Introduction</td><td> </td><td class="right">1. Introduction</td><td class="lineno" valign="top"></td></tr>
179	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
180	<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>
181	<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>
182	<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>
183	<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>
184	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
185	<tr><td class="lineno" valign="top"></td><td class="left">1.1. Purpose</td><td> </td><td class="right">1.1. Purpose</td><td class="lineno" valign="top"></td></tr>
186	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
187	<tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 6, line 8</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 6, line 8</em></th><td></td></tr>
188	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
189	<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>
190	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
191	<tr><td class="lineno" valign="top"></td><td class="left"> A protocol element (e.g., an entity-tag or a Last-Modified time)</td><td> </td><td class="right"> A protocol element (e.g., an entity-tag or a Last-Modified time)</td><td class="lineno" valign="top"></td></tr>
192	<tr><td class="lineno" valign="top"></td><td class="left"> that is used to find out whether a stored response is an</td><td> </td><td class="right"> that is used to find out whether a stored response is an</td><td class="lineno" valign="top"></td></tr>
193	<tr><td class="lineno" valign="top"></td><td class="left"> equivalent copy of a representation. See Section 2.1 of [Part4].</td><td> </td><td class="right"> equivalent copy of a representation. See Section 2.1 of [Part4].</td><td class="lineno" valign="top"></td></tr>
194	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
195	<tr><td class="lineno" valign="top"></td><td class="left"> strong validator</td><td> </td><td class="right"> strong validator</td><td class="lineno" valign="top"></td></tr>
196	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
197	<tr><td class="lineno" valign="top"></td><td class="left"> A validator that is defined by the origin server such that its</td><td> </td><td class="right"> A validator that is defined by the origin server such that its</td><td class="lineno" valign="top"></td></tr>
198	<tr><td><a name="diff0012" /></td></tr>
199	<tr><td class="lineno" valign="top"></td><td class="lblock"> current value will change if the representation <span class="delete">body</span> changes;</td><td> </td><td class="rblock"> current value will change if the representation <span class="insert">data</span> changes;</td><td class="lineno" valign="top"></td></tr>
200	<tr><td class="lineno" valign="top"></td><td class="left"> i.e., an entity-tag that is not marked as weak (Section 2.3 of</td><td> </td><td class="right"> i.e., an entity-tag that is not marked as weak (Section 2.3 of</td><td class="lineno" valign="top"></td></tr>
201	<tr><td class="lineno" valign="top"></td><td class="left"> [Part4]) or, if no entity-tag is provided, a Last-Modified value</td><td> </td><td class="right"> [Part4]) or, if no entity-tag is provided, a Last-Modified value</td><td class="lineno" valign="top"></td></tr>
202	<tr><td class="lineno" valign="top"></td><td class="left"> that is strong in the sense defined by Section 2.2.2 of [Part4].</td><td> </td><td class="right"> that is strong in the sense defined by Section 2.2.2 of [Part4].</td><td class="lineno" valign="top"></td></tr>
203	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
204	<tr><td class="lineno" valign="top"></td><td class="left">1.3. Conformance and Error Handling</td><td> </td><td class="right">1.3. Conformance and Error Handling</td><td class="lineno" valign="top"></td></tr>
205	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
206	<tr><td class="lineno" valign="top"></td><td class="left"> 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>
207	<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>
208	<tr><td class="lineno" valign="top"></td><td class="left"> document are to be interpreted as described in [RFC2119].</td><td> </td><td class="right"> document are to be interpreted as described in [RFC2119].</td><td class="lineno" valign="top"></td></tr>
209	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
210	<tr><td><a name="diff0013" /></td></tr>
211	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">This specification targets conformance</span> criteria <span class="delete">according to the role</span></td><td> </td><td class="rblock"> <span class="insert">Conformance</span> criteria and <span class="insert">considerations regarding</span> error handling <span class="insert">are</span></td><td class="lineno" valign="top"></td></tr>
212	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> of a participant in HTTP communication. Hence, HTTP requirements are</span></td><td> </td><td class="rblock"><span class="insert"> defined in Section 2.5</span> of <span class="insert">[Part1].</span></td><td class="lineno" valign="top"></td></tr>
213	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> placed on senders, recipients, clients, servers, user agents,</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
214	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> intermediaries, origin servers, proxies, gateways, or caches,</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
215	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> depending on what behavior is being constrained by the requirement.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
216	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> See Section 2 of [Part1] for definitions of these terms.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
217	<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>
218	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> The verb "generate" is used instead of "send" where a requirement</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
219	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> differentiates between creating a protocol element</span> and <span class="delete">merely</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
220	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> forwarding a received element downstream.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
221	<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>
222	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> An implementation is considered conformant if it complies with all of</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
223	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> the requirements associated with the roles it partakes in HTTP. Note</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
224	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> that SHOULD-level requirements are relevant here, unless one of the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
225	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> documented exceptions is applicable.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
226	<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>
227	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> This document also uses ABNF to define valid protocol elements</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
228	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> (Section 1.4). In addition to the prose requirements placed upon</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
229	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> them, senders MUST NOT generate protocol elements that do not match</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
230	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> the grammar defined by the ABNF rules for those protocol elements</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
231	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> that are applicable to the sender's role. If a received protocol</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
232	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> element is processed, the recipient MUST be able to parse any value</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
233	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> that would match the ABNF rules for that protocol element, excluding</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
234	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> only those rules not applicable to the recipient's role.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
235	<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>
236	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Unless noted otherwise, a recipient MAY attempt to recover a usable</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
237	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> protocol element from an invalid construct. HTTP does not define</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
238	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> specific error handling mechanisms except when they have a direct</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
239	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> impact on security, since different applications of the protocol</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
240	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> require different</span> error handling <span class="delete">strategies. For example, a Web</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
241	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> browser might wish to transparently recover from a response where the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
242	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Location header field doesn't parse according to the ABNF, whereas a</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
243	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> systems control client might consider any form</span> of <span class="delete">error recovery to</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
244	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> be dangerous.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
245	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
246	<tr><td class="lineno" valign="top"></td><td class="left">1.4. Syntax Notation</td><td> </td><td class="right">1.4. Syntax Notation</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"> This specification uses the Augmented Backus-Naur Form (ABNF)</td><td> </td><td class="right"> This specification uses the Augmented Backus-Naur Form (ABNF)</td><td class="lineno" valign="top"></td></tr>
249	<tr><td class="lineno" valign="top"></td><td class="left"> notation of [RFC5234] with the list rule extension defined in Section</td><td> </td><td class="right"> notation of [RFC5234] with the list rule extension defined in Section</td><td class="lineno" valign="top"></td></tr>
250	<tr><td class="lineno" valign="top"></td><td class="left"> 1.2 of [Part1]. Appendix B describes rules imported from other</td><td> </td><td class="right"> 1.2 of [Part1]. Appendix B describes rules imported from other</td><td class="lineno" valign="top"></td></tr>
251	<tr><td class="lineno" valign="top"></td><td class="left"> documents. Appendix C shows the collected ABNF with the list rule</td><td> </td><td class="right"> documents. Appendix C shows the collected ABNF with the list rule</td><td class="lineno" valign="top"></td></tr>
252	<tr><td class="lineno" valign="top"></td><td class="left"> expanded.</td><td> </td><td class="right"> expanded.</td><td class="lineno" valign="top"></td></tr>
253	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
254	<tr><td class="lineno" valign="top"></td><td class="left">1.4.1. Delta Seconds</td><td> </td><td class="right">1.4.1. Delta Seconds</td><td class="lineno" valign="top"></td></tr>
255	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
256	<tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 10, line 45</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 10, line 11</em></th><td></td></tr>
257	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
258	<tr><td class="lineno" valign="top"></td><td class="left"> Note that any of the requirements listed above can be overridden by a</td><td> </td><td class="right"> Note that any of the requirements listed above can be overridden by a</td><td class="lineno" valign="top"></td></tr>
259	<tr><td class="lineno" valign="top"></td><td class="left"> cache-control extension; see Section 7.2.3.</td><td> </td><td class="right"> cache-control extension; see Section 7.2.3.</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"> When a stored response is used to satisfy a request without</td><td> </td><td class="right"> When a stored response is used to satisfy a request without</td><td class="lineno" valign="top"></td></tr>
262	<tr><td class="lineno" valign="top"></td><td class="left"> validation, a cache MUST include a single Age header field</td><td> </td><td class="right"> validation, a cache MUST include a single Age header field</td><td class="lineno" valign="top"></td></tr>
263	<tr><td class="lineno" valign="top"></td><td class="left"> (Section 7.1) in the response with a value equal to the stored</td><td> </td><td class="right"> (Section 7.1) in the response with a value equal to the stored</td><td class="lineno" valign="top"></td></tr>
264	<tr><td class="lineno" valign="top"></td><td class="left"> response's current_age; see Section 4.1.3.</td><td> </td><td class="right"> response's current_age; see Section 4.1.3.</td><td class="lineno" valign="top"></td></tr>
265	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
266	<tr><td class="lineno" valign="top"></td><td class="left"> A cache MUST write through requests with methods that are unsafe</td><td> </td><td class="right"> A cache MUST write through requests with methods that are unsafe</td><td class="lineno" valign="top"></td></tr>
267	<tr><td><a name="diff0014" /></td></tr>
268	<tr><td class="lineno" valign="top"></td><td class="lblock"> (Section <span class="delete">2.1</span>.1 of [Part2]) to the origin server; i.e., a cache is not</td><td> </td><td class="rblock"> (Section <span class="insert">5.2</span>.1 of [Part2]) to the origin server; i.e., a cache is not</td><td class="lineno" valign="top"></td></tr>
269	<tr><td class="lineno" valign="top"></td><td class="left"> allowed to generate a reply to such a request before having forwarded</td><td> </td><td class="right"> allowed to generate a reply to such a request before having forwarded</td><td class="lineno" valign="top"></td></tr>
270	<tr><td class="lineno" valign="top"></td><td class="left"> the request and having received a corresponding response.</td><td> </td><td class="right"> the request and having received a corresponding response.</td><td class="lineno" valign="top"></td></tr>
271	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
272	<tr><td class="lineno" valign="top"></td><td class="left"> 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>
273	<tr><td class="lineno" valign="top"></td><td class="left"> responses; see Section 6.</td><td> </td><td class="right"> responses; see Section 6.</td><td class="lineno" valign="top"></td></tr>
274	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
275	<tr><td class="lineno" valign="top"></td><td class="left"> When more than one suitable response is stored, a cache MUST use the</td><td> </td><td class="right"> When more than one suitable response is stored, a cache MUST use the</td><td class="lineno" valign="top"></td></tr>
276	<tr><td class="lineno" valign="top"></td><td class="left"> most recent response (as determined by the Date header field). It</td><td> </td><td class="right"> most recent response (as determined by the Date header field). It</td><td class="lineno" valign="top"></td></tr>
277	<tr><td class="lineno" valign="top"></td><td class="left"> can also forward a request with "Cache-Control: max-age=0" or "Cache-</td><td> </td><td class="right"> can also forward a request with "Cache-Control: max-age=0" or "Cache-</td><td class="lineno" valign="top"></td></tr>
278	<tr><td class="lineno" valign="top"></td><td class="left"> Control: no-cache" to disambiguate which response to use.</td><td> </td><td class="right"> Control: no-cache" to disambiguate which response to use.</td><td class="lineno" valign="top"></td></tr>
279	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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281	<tr><td class="lineno" valign="top"></td><td class="left"> When there is more than one value present for a given directive</td><td> </td><td class="right"> When there is more than one value present for a given directive</td><td class="lineno" valign="top"></td></tr>
282	<tr><td class="lineno" valign="top"></td><td class="left"> (e.g., two Expires header fields, multiple Cache-Control: max-age</td><td> </td><td class="right"> (e.g., two Expires header fields, multiple Cache-Control: max-age</td><td class="lineno" valign="top"></td></tr>
283	<tr><td class="lineno" valign="top"></td><td class="left"> directives), it is considered invalid. Caches are encouraged to</td><td> </td><td class="right"> directives), it is considered invalid. Caches are encouraged to</td><td class="lineno" valign="top"></td></tr>
284	<tr><td class="lineno" valign="top"></td><td class="left"> consider responses that have invalid freshness information to be</td><td> </td><td class="right"> consider responses that have invalid freshness information to be</td><td class="lineno" valign="top"></td></tr>
285	<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>
286	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
287	<tr><td class="lineno" valign="top"></td><td class="left">4.1.2. Calculating Heuristic Freshness</td><td> </td><td class="right">4.1.2. Calculating Heuristic Freshness</td><td class="lineno" valign="top"></td></tr>
288	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
289	<tr><td class="lineno" valign="top"></td><td class="left"> 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>
290	<tr><td class="lineno" valign="top"></td><td class="left"> has a status code whose definition allows heuristic freshness to be</td><td> </td><td class="right"> has a status code whose definition allows heuristic freshness to be</td><td class="lineno" valign="top"></td></tr>
291	<tr><td><a name="diff0015" /></td></tr>
292	<tr><td class="lineno" valign="top"></td><td class="lblock"> used (including the following in Section <span class="delete">4</span> of [Part2]: 200 (OK), 203</td><td> </td><td class="rblock"> used (including the following in Section <span class="insert">7</span> of [Part2]: 200 (OK), 203</td><td class="lineno" valign="top"></td></tr>
293	<tr><td class="lineno" valign="top"></td><td class="left"> (Non-Authoritative Information), 206 (Partial Content), 300 (Multiple</td><td> </td><td class="right"> (Non-Authoritative Information), 206 (Partial Content), 300 (Multiple</td><td class="lineno" valign="top"></td></tr>
294	<tr><td class="lineno" valign="top"></td><td class="left"> Choices), 301 (Moved Permanently) and 410 (Gone)), a cache MAY</td><td> </td><td class="right"> Choices), 301 (Moved Permanently) and 410 (Gone)), a cache MAY</td><td class="lineno" valign="top"></td></tr>
295	<tr><td class="lineno" valign="top"></td><td class="left"> calculate a heuristic expiration time. A cache MUST NOT use</td><td> </td><td class="right"> calculate a heuristic expiration time. A cache MUST NOT use</td><td class="lineno" valign="top"></td></tr>
296	<tr><td class="lineno" valign="top"></td><td class="left"> heuristics to determine freshness for responses with status codes</td><td> </td><td class="right"> heuristics to determine freshness for responses with status codes</td><td class="lineno" valign="top"></td></tr>
297	<tr><td class="lineno" valign="top"></td><td class="left"> that do not explicitly allow it.</td><td> </td><td class="right"> that do not explicitly allow it.</td><td class="lineno" valign="top"></td></tr>
298	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
299	<tr><td class="lineno" valign="top"></td><td class="left"> When a heuristic is used to calculate freshness lifetime, a cache</td><td> </td><td class="right"> When a heuristic is used to calculate freshness lifetime, a cache</td><td class="lineno" valign="top"></td></tr>
300	<tr><td class="lineno" valign="top"></td><td class="left"> SHOULD attach a Warning header field with a 113 warn-code to the</td><td> </td><td class="right"> SHOULD attach a Warning header field with a 113 warn-code to the</td><td class="lineno" valign="top"></td></tr>
301	<tr><td class="lineno" valign="top"></td><td class="left"> response if its current_age is more than 24 hours and such a warning</td><td> </td><td class="right"> response if its current_age is more than 24 hours and such a warning</td><td class="lineno" valign="top"></td></tr>
302	<tr><td class="lineno" valign="top"></td><td class="left"> is not already present.</td><td> </td><td class="right"> is not already present.</td><td class="lineno" valign="top"></td></tr>
303	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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305	<tr><td class="lineno" valign="top"></td><td class="left"> The term "age_value" denotes the value of the Age header field</td><td> </td><td class="right"> The term "age_value" denotes the value of the Age header field</td><td class="lineno" valign="top"></td></tr>
306	<tr><td class="lineno" valign="top"></td><td class="left"> (Section 7.1), in a form appropriate for arithmetic operation; or</td><td> </td><td class="right"> (Section 7.1), in a form appropriate for arithmetic operation; or</td><td class="lineno" valign="top"></td></tr>
307	<tr><td class="lineno" valign="top"></td><td class="left"> 0, if not available.</td><td> </td><td class="right"> 0, if not available.</td><td class="lineno" valign="top"></td></tr>
308	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
309	<tr><td class="lineno" valign="top"></td><td class="left"> date_value</td><td> </td><td class="right"> date_value</td><td class="lineno" valign="top"></td></tr>
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"> HTTP/1.1 requires origin servers to send a Date header field, if</td><td> </td><td class="right"> HTTP/1.1 requires origin servers to send a Date header field, if</td><td class="lineno" valign="top"></td></tr>
312	<tr><td class="lineno" valign="top"></td><td class="left"> possible, with every response, giving the time at which the</td><td> </td><td class="right"> possible, with every response, giving the time at which the</td><td class="lineno" valign="top"></td></tr>
313	<tr><td class="lineno" valign="top"></td><td class="left"> response was generated. The term "date_value" denotes the value</td><td> </td><td class="right"> response was generated. The term "date_value" denotes the value</td><td class="lineno" valign="top"></td></tr>
314	<tr><td class="lineno" valign="top"></td><td class="left"> of the Date header field, in a form appropriate for arithmetic</td><td> </td><td class="right"> of the Date header field, in a form appropriate for arithmetic</td><td class="lineno" valign="top"></td></tr>
315	<tr><td><a name="diff0016" /></td></tr>
316	<tr><td class="lineno" valign="top"></td><td class="lblock"> operations. See Section <span class="delete">9.10</span> of [Part2] for the definition of the</td><td> </td><td class="rblock"> operations. See Section <span class="insert">8.1.1.2</span> of [Part2] for the definition of</td><td class="lineno" valign="top"></td></tr>
317	<tr><td class="lineno" valign="top"></td><td class="lblock"> Date header field, and for requirements regarding responses</td><td> </td><td class="rblock"> the Date header field, and for requirements regarding responses</td><td class="lineno" valign="top"></td></tr>
318	<tr><td class="lineno" valign="top"></td><td class="left"> without it.</td><td> </td><td class="right"> without it.</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"> now</td><td> </td><td class="right"> now</td><td class="lineno" valign="top"></td></tr>
321	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
322	<tr><td class="lineno" valign="top"></td><td class="left"> The term "now" means "the current value of the clock at the host</td><td> </td><td class="right"> The term "now" means "the current value of the clock at the host</td><td class="lineno" valign="top"></td></tr>
323	<tr><td class="lineno" valign="top"></td><td class="left"> performing the calculation". A cache SHOULD use NTP ([RFC1305])</td><td> </td><td class="right"> performing the calculation". A cache SHOULD use NTP ([RFC1305])</td><td class="lineno" valign="top"></td></tr>
324	<tr><td class="lineno" valign="top"></td><td class="left"> or some similar protocol to synchronize its clocks to a globally</td><td> </td><td class="right"> or some similar protocol to synchronize its clocks to a globally</td><td class="lineno" valign="top"></td></tr>
325	<tr><td class="lineno" valign="top"></td><td class="left"> accurate time standard.</td><td> </td><td class="right"> accurate time standard.</td><td class="lineno" valign="top"></td></tr>
326	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
327	<tr><td class="lineno" valign="top"></td><td class="left"> request_time</td><td> </td><td class="right"> request_time</td><td class="lineno" valign="top"></td></tr>
328	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
329	<tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 15, line 5</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 14, line 23</em></th><td></td></tr>
330	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
331	<tr><td class="lineno" valign="top"></td><td class="left"> The current_age of a stored response can then be calculated by adding</td><td> </td><td class="right"> The current_age of a stored response can then be calculated by adding</td><td class="lineno" valign="top"></td></tr>
332	<tr><td class="lineno" valign="top"></td><td class="left"> the amount of time (in seconds) since the stored response was last</td><td> </td><td class="right"> the amount of time (in seconds) since the stored response was last</td><td class="lineno" valign="top"></td></tr>
333	<tr><td class="lineno" valign="top"></td><td class="left"> validated by the origin server to the corrected_initial_age.</td><td> </td><td class="right"> validated by the origin server to the corrected_initial_age.</td><td class="lineno" valign="top"></td></tr>
334	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
335	<tr><td class="lineno" valign="top"></td><td class="left"> resident_time = now - response_time;</td><td> </td><td class="right"> resident_time = now - response_time;</td><td class="lineno" valign="top"></td></tr>
336	<tr><td class="lineno" valign="top"></td><td class="left"> current_age = corrected_initial_age + resident_time;</td><td> </td><td class="right"> current_age = corrected_initial_age + resident_time;</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"> Additionally, to avoid common problems in date parsing:</td><td> </td><td class="right"> Additionally, to avoid common problems in date parsing:</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><a name="diff0017" /></td></tr>
341	<tr><td class="lineno" valign="top"></td><td class="lblock"> o <span class="delete">HTTP/1.1 clients and caches</span> SHOULD assume that an RFC-850 date</td><td> </td><td class="rblock"> o <span class="insert">Recipients</span> SHOULD assume that an RFC-850 date which appears to be</td><td class="lineno" valign="top"></td></tr>
342	<tr><td class="lineno" valign="top"></td><td class="lblock"> which appears to be more than 50 years in the future is in fact in</td><td> </td><td class="rblock"> more than 50 years in the future is in fact in the past (this</td><td class="lineno" valign="top"></td></tr>
343	<tr><td class="lineno" valign="top"></td><td class="lblock"> the past (this helps solve the "year 2000" problem).</td><td> </td><td class="rblock"> helps solve the "year 2000" problem).</td><td class="lineno" valign="top"></td></tr>
344	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
345	<tr><td class="lineno" valign="top"></td><td class="left"> o Although all date formats are specified to be case-sensitive,</td><td> </td><td class="right"> o Although all date formats are specified to be case-sensitive,</td><td class="lineno" valign="top"></td></tr>
346	<tr><td class="lineno" valign="top"></td><td class="left"> recipients SHOULD match day, week and timezone names case-</td><td> </td><td class="right"> recipients SHOULD match day, week and timezone names case-</td><td class="lineno" valign="top"></td></tr>
347	<tr><td class="lineno" valign="top"></td><td class="left"> insensitively.</td><td> </td><td class="right"> insensitively.</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><a name="diff0018" /></td></tr>
350	<tr><td class="lineno" valign="top"></td><td class="lblock"> o An <span class="delete">HTTP/1.1</span> implementation MAY internally represent a parsed</td><td> </td><td class="rblock"> o An implementation MAY internally represent a parsed Expires date</td><td class="lineno" valign="top"></td></tr>
351	<tr><td class="lineno" valign="top"></td><td class="lblock"> Expires date as earlier than the proper value, but MUST NOT</td><td> </td><td class="rblock"> as earlier than the proper value, but MUST NOT internally</td><td class="lineno" valign="top"></td></tr>
352	<tr><td class="lineno" valign="top"></td><td class="lblock"> internally represent a parsed Expires date as later than the</td><td> </td><td class="rblock"> represent a parsed Expires date as later than the proper value.</td><td class="lineno" valign="top"></td></tr>
353	<tr><td class="lineno" valign="top"></td><td class="lblock"> proper value.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
354	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
355	<tr><td><a name="diff0019" /></td></tr>
356	<tr><td class="lineno" valign="top"></td><td class="lblock"> o <span class="delete">All</span> expiration-related calculations <span class="delete">MUST be done</span> in GMT. The</td><td> </td><td class="rblock"> o <span class="insert">Recipients MUST perform all</span> expiration-related calculations in</td><td class="lineno" valign="top"></td></tr>
357	<tr><td class="lineno" valign="top"></td><td class="lblock"> local time zone MUST NOT influence the calculation or comparison</td><td> </td><td class="rblock"> GMT. The local time zone MUST NOT influence the calculation or</td><td class="lineno" valign="top"></td></tr>
358	<tr><td class="lineno" valign="top"></td><td class="lblock"> of an age or expiration time.</td><td> </td><td class="rblock"> comparison of an age or expiration time.</td><td class="lineno" valign="top"></td></tr>
359	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
360	<tr><td><a name="diff0020" /></td></tr>
361	<tr><td class="lineno" valign="top"></td><td class="lblock"> o <span class="delete">If an HTTP header field incorrectly carries a date value</span> with <span class="delete">a</span></td><td> </td><td class="rblock"> o <span class="insert">Caches SHOULD consider dates</span> with time <span class="insert">zones</span> other than <span class="insert">"GMT"</span></td><td class="lineno" valign="top"></td></tr>
362	<tr><td class="lineno" valign="top"></td><td class="lblock"> time <span class="delete">zone</span> other than <span class="delete">GMT, it MUST be converted into GMT using the</span></td><td> </td><td class="rblock"><span class="insert"> invalid.</span></td><td class="lineno" valign="top"></td></tr>
363	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> most conservative possible conversion.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
364	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
365	<tr><td class="lineno" valign="top"></td><td class="left">4.1.4. Serving Stale Responses</td><td> </td><td class="right">4.1.4. Serving Stale Responses</td><td class="lineno" valign="top"></td></tr>
366	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
367	<tr><td class="lineno" valign="top"></td><td class="left"> A "stale" response is one that either has explicit expiry information</td><td> </td><td class="right"> A "stale" response is one that either has explicit expiry information</td><td class="lineno" valign="top"></td></tr>
368	<tr><td class="lineno" valign="top"></td><td class="left"> or is allowed to have heuristic expiry calculated, but is not fresh</td><td> </td><td class="right"> or is allowed to have heuristic expiry calculated, but is not fresh</td><td class="lineno" valign="top"></td></tr>
369	<tr><td class="lineno" valign="top"></td><td class="left"> according to the calculations in Section 4.1.</td><td> </td><td class="right"> according to the calculations in Section 4.1.</td><td class="lineno" valign="top"></td></tr>
370	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
371	<tr><td class="lineno" valign="top"></td><td class="left"> A cache MUST NOT return a stale response if it is prohibited by an</td><td> </td><td class="right"> A cache MUST NOT return a stale response if it is prohibited by an</td><td class="lineno" valign="top"></td></tr>
372	<tr><td class="lineno" valign="top"></td><td class="left"> explicit in-protocol directive (e.g., by a "no-store" or "no-cache"</td><td> </td><td class="right"> explicit in-protocol directive (e.g., by a "no-store" or "no-cache"</td><td class="lineno" valign="top"></td></tr>
373	<tr><td class="lineno" valign="top"></td><td class="left"> cache directive, a "must-revalidate" cache-response-directive, or an</td><td> </td><td class="right"> cache directive, a "must-revalidate" cache-response-directive, or an</td><td class="lineno" valign="top"></td></tr>
374	<tr><td class="lineno" valign="top"></td><td class="left"> applicable "s-maxage" or "proxy-revalidate" cache-response-directive;</td><td> </td><td class="right"> applicable "s-maxage" or "proxy-revalidate" cache-response-directive;</td><td class="lineno" valign="top"></td></tr>
375	<tr><td class="lineno" valign="top"></td><td class="left"> see Section 7.2.2).</td><td> </td><td class="right"> see Section 7.2.2).</td><td class="lineno" valign="top"></td></tr>
376	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
377	<tr><td class="lineno" valign="top"></td><td class="left"> A cache MUST NOT return stale responses unless it is disconnected</td><td> </td><td class="right"> A cache MUST NOT return stale responses unless it is disconnected</td><td class="lineno" valign="top"></td></tr>
378	<tr><td class="lineno" valign="top"></td><td class="left"> (i.e., it cannot contact the origin server or otherwise find a</td><td> </td><td class="right"> (i.e., it cannot contact the origin server or otherwise find a</td><td class="lineno" valign="top"></td></tr>
379	<tr><td class="lineno" valign="top"></td><td class="left"> forward path) or doing so is explicitly allowed (e.g., by the max-</td><td> </td><td class="right"> forward path) or doing so is explicitly allowed (e.g., by the max-</td><td class="lineno" valign="top"></td></tr>
380	<tr><td class="lineno" valign="top"></td><td class="left"> stale request directive; see Section 7.2.1).</td><td> </td><td class="right"> stale request directive; see Section 7.2.1).</td><td class="lineno" valign="top"></td></tr>
381	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
382	<tr><td class="lineno" valign="top"></td><td class="left"> A cache SHOULD append a Warning header field with the 110 warn-code</td><td> </td><td class="right"> A cache SHOULD append a Warning header field with the 110 warn-code</td><td class="lineno" valign="top"></td></tr>
383	<tr><td><a name="diff0021" /></td></tr>
384	<tr><td class="lineno" valign="top"></td><td class="lblock"> (see Section 7.<span class="delete">6</span>) to stale responses. Likewise, a cache SHOULD add</td><td> </td><td class="rblock"> (see Section 7.<span class="insert">5</span>) to stale responses. Likewise, a cache SHOULD add</td><td class="lineno" valign="top"></td></tr>
385	<tr><td class="lineno" valign="top"></td><td class="left"> the 112 warn-code to stale responses if the cache is disconnected.</td><td> </td><td class="right"> the 112 warn-code to stale responses if the cache is disconnected.</td><td class="lineno" valign="top"></td></tr>
386	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
387	<tr><td class="lineno" valign="top"></td><td class="left"> If a cache receives a first-hand response (either an entire response,</td><td> </td><td class="right"> If a cache receives a first-hand response (either an entire response,</td><td class="lineno" valign="top"></td></tr>
388	<tr><td class="lineno" valign="top"></td><td class="left"> or a 304 (Not Modified) response) that it would normally forward to</td><td> </td><td class="right"> or a 304 (Not Modified) response) that it would normally forward to</td><td class="lineno" valign="top"></td></tr>
389	<tr><td class="lineno" valign="top"></td><td class="left"> the requesting client, and the received response is no longer fresh,</td><td> </td><td class="right"> the requesting client, and the received response is no longer fresh,</td><td class="lineno" valign="top"></td></tr>
390	<tr><td class="lineno" valign="top"></td><td class="left"> the cache can forward it to the requesting client without adding a</td><td> </td><td class="right"> the cache can forward it to the requesting client without adding a</td><td class="lineno" valign="top"></td></tr>
391	<tr><td class="lineno" valign="top"></td><td class="left"> new Warning (but without removing any existing Warning header</td><td> </td><td class="right"> new Warning (but without removing any existing Warning header</td><td class="lineno" valign="top"></td></tr>
392	<tr><td class="lineno" valign="top"></td><td class="left"> fields). A cache shouldn't attempt to validate a response simply</td><td> </td><td class="right"> fields). A cache shouldn't attempt to validate a response simply</td><td class="lineno" valign="top"></td></tr>
393	<tr><td class="lineno" valign="top"></td><td class="left"> because that response became stale in transit.</td><td> </td><td class="right"> because that response became stale in transit.</td><td class="lineno" valign="top"></td></tr>
394	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
395	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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397	<tr><td class="lineno" valign="top"></td><td class="left"> responses contains only partial content, the cache shouldn't include</td><td> </td><td class="right"> responses contains only partial content, the cache shouldn't include</td><td class="lineno" valign="top"></td></tr>
398	<tr><td class="lineno" valign="top"></td><td class="left"> its entity-tag in the If-None-Match header field unless the request</td><td> </td><td class="right"> its entity-tag in the If-None-Match header field unless the request</td><td class="lineno" valign="top"></td></tr>
399	<tr><td class="lineno" valign="top"></td><td class="left"> is for a range that would be fully satisfied by that stored response.</td><td> </td><td class="right"> is for a range that would be fully satisfied by that stored response.</td><td class="lineno" valign="top"></td></tr>
400	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
401	<tr><td class="lineno" valign="top"></td><td class="left"> Cache handling of a response to a conditional request is dependent</td><td> </td><td class="right"> Cache handling of a response to a conditional request is dependent</td><td class="lineno" valign="top"></td></tr>
402	<tr><td class="lineno" valign="top"></td><td class="left"> upon its status code:</td><td> </td><td class="right"> upon its status code:</td><td class="lineno" valign="top"></td></tr>
403	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
404	<tr><td class="lineno" valign="top"></td><td class="left"> o A 304 (Not Modified) response status code indicates that the</td><td> </td><td class="right"> o A 304 (Not Modified) response status code indicates that the</td><td class="lineno" valign="top"></td></tr>
405	<tr><td class="lineno" valign="top"></td><td class="left"> stored response can be updated and reused; see Section 4.2.1.</td><td> </td><td class="right"> stored response can be updated and reused; see Section 4.2.1.</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><a name="diff0022" /></td></tr>
408	<tr><td class="lineno" valign="top"></td><td class="lblock"> o A full response (i.e., one with a <span class="delete">response</span> body) indicates that</td><td> </td><td class="rblock"> o A full response (i.e., one with a <span class="insert">payload</span> body) indicates that</td><td class="lineno" valign="top"></td></tr>
409	<tr><td class="lineno" valign="top"></td><td class="left"> none of the stored responses nominated in the conditional request</td><td> </td><td class="right"> none of the stored responses nominated in the conditional request</td><td class="lineno" valign="top"></td></tr>
410	<tr><td class="lineno" valign="top"></td><td class="left"> is suitable. Instead, the cache can use the full response to</td><td> </td><td class="right"> is suitable. Instead, the cache can use the full response to</td><td class="lineno" valign="top"></td></tr>
411	<tr><td class="lineno" valign="top"></td><td class="left"> satisfy the request and MAY replace the stored response(s).</td><td> </td><td class="right"> satisfy the request and MAY replace the stored response(s).</td><td class="lineno" valign="top"></td></tr>
412	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
413	<tr><td class="lineno" valign="top"></td><td class="left"> o However, if a cache receives a 5xx (Server Error) response while</td><td> </td><td class="right"> o However, if a cache receives a 5xx (Server Error) response while</td><td class="lineno" valign="top"></td></tr>
414	<tr><td class="lineno" valign="top"></td><td class="left"> attempting to validate a response, it can either forward this</td><td> </td><td class="right"> attempting to validate a response, it can either forward this</td><td class="lineno" valign="top"></td></tr>
415	<tr><td class="lineno" valign="top"></td><td class="left"> response to the requesting client, or act as if the server failed</td><td> </td><td class="right"> response to the requesting client, or act as if the server failed</td><td class="lineno" valign="top"></td></tr>
416	<tr><td class="lineno" valign="top"></td><td class="left"> to respond. In the latter case, it can return a previously stored</td><td> </td><td class="right"> to respond. In the latter case, it can return a previously stored</td><td class="lineno" valign="top"></td></tr>
417	<tr><td class="lineno" valign="top"></td><td class="left"> response (see Section 4.1.4).</td><td> </td><td class="right"> response (see Section 4.1.4).</td><td class="lineno" valign="top"></td></tr>
418	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
419	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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421	<tr><td class="lineno" valign="top"></td><td class="left"> corresponds to one of the cache's stored responses, then the most</td><td> </td><td class="right"> corresponds to one of the cache's stored responses, then the most</td><td class="lineno" valign="top"></td></tr>
422	<tr><td class="lineno" valign="top"></td><td class="left"> recent of those matching stored responses is selected.</td><td> </td><td class="right"> recent of those matching stored responses is selected.</td><td class="lineno" valign="top"></td></tr>
423	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
424	<tr><td class="lineno" valign="top"></td><td class="left"> o If the new response does not include any form of validator, there</td><td> </td><td class="right"> o If the new response does not include any form of validator, there</td><td class="lineno" valign="top"></td></tr>
425	<tr><td class="lineno" valign="top"></td><td class="left"> is only one stored response, and that stored response also lacks a</td><td> </td><td class="right"> is only one stored response, and that stored response also lacks a</td><td class="lineno" valign="top"></td></tr>
426	<tr><td class="lineno" valign="top"></td><td class="left"> validator, then that stored response is selected.</td><td> </td><td class="right"> validator, then that stored response is selected.</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 class="lineno" valign="top"></td><td class="left"> If a stored response is selected for update, the cache MUST:</td><td> </td><td class="right"> If a stored response is selected for update, the cache MUST:</td><td class="lineno" valign="top"></td></tr>
429	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
430	<tr><td class="lineno" valign="top"></td><td class="left"> o delete any Warning header fields in the stored response with warn-</td><td> </td><td class="right"> o delete any Warning header fields in the stored response with warn-</td><td class="lineno" valign="top"></td></tr>
431	<tr><td><a name="diff0023" /></td></tr>
432	<tr><td class="lineno" valign="top"></td><td class="lblock"> code 1xx (see Section 7.<span class="delete">6</span>);</td><td> </td><td class="rblock"> code 1xx (see Section 7.<span class="insert">5</span>);</td><td class="lineno" valign="top"></td></tr>
433	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
434	<tr><td class="lineno" valign="top"></td><td class="left"> o retain any Warning header fields in the stored response with warn-</td><td> </td><td class="right"> o retain any Warning header fields in the stored response with warn-</td><td class="lineno" valign="top"></td></tr>
435	<tr><td class="lineno" valign="top"></td><td class="left"> code 2xx; and,</td><td> </td><td class="right"> code 2xx; and,</td><td class="lineno" valign="top"></td></tr>
436	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
437	<tr><td class="lineno" valign="top"></td><td class="left"> o use other header fields provided in the 304 (Not Modified)</td><td> </td><td class="right"> o use other header fields provided in the 304 (Not Modified)</td><td class="lineno" valign="top"></td></tr>
438	<tr><td class="lineno" valign="top"></td><td class="left"> response to replace all instances of the corresponding header</td><td> </td><td class="right"> response to replace all instances of the corresponding header</td><td class="lineno" valign="top"></td></tr>
439	<tr><td class="lineno" valign="top"></td><td class="left"> fields in the stored response.</td><td> </td><td class="right"> fields in the stored response.</td><td class="lineno" valign="top"></td></tr>
440	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
441	<tr><td class="lineno" valign="top"></td><td class="left">4.3. Using Negotiated Responses</td><td> </td><td class="right">4.3. Using Negotiated Responses</td><td class="lineno" valign="top"></td></tr>
442	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
443	<tr><td class="lineno" valign="top"></td><td class="left"> When a cache receives a request that can be satisfied by a stored</td><td> </td><td class="right"> When a cache receives a request that can be satisfied by a stored</td><td class="lineno" valign="top"></td></tr>
444	<tr><td><a name="diff0024" /></td></tr>
445	<tr><td class="lineno" valign="top"></td><td class="lblock"> response that has a Vary header field (Section <span class="delete">7.5),</span> it MUST NOT use</td><td> </td><td class="rblock"> response that has a Vary header field (Section <span class="insert">8.2.1 of [Part2]),</span> it</td><td class="lineno" valign="top"></td></tr>
446	<tr><td class="lineno" valign="top"></td><td class="lblock"> that response unless all of the selecting header fields nominated by</td><td> </td><td class="rblock"> MUST NOT use that response unless all of the selecting header fields</td><td class="lineno" valign="top"></td></tr>
447	<tr><td class="lineno" valign="top"></td><td class="lblock"> the Vary header field match in both the original request (i.e., that</td><td> </td><td class="rblock"> nominated by the Vary header field match in both the original request</td><td class="lineno" valign="top"></td></tr>
448	<tr><td class="lineno" valign="top"></td><td class="lblock"> associated with the stored response), and the presented request.</td><td> </td><td class="rblock"> (i.e., that associated with the stored response), and the presented</td><td class="lineno" valign="top"></td></tr>
449	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> request.</td><td class="lineno" valign="top"></td></tr>
450	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
451	<tr><td class="lineno" valign="top"></td><td class="left"> The selecting header fields from two requests are defined to match if</td><td> </td><td class="right"> The selecting header fields from two requests are defined to match if</td><td class="lineno" valign="top"></td></tr>
452	<tr><td class="lineno" valign="top"></td><td class="left"> and only if those in the first request can be transformed to those in</td><td> </td><td class="right"> and only if those in the first request can be transformed to those in</td><td class="lineno" valign="top"></td></tr>
453	<tr><td class="lineno" valign="top"></td><td class="left"> the second request by applying any of the following:</td><td> </td><td class="right"> the second request by applying any of the following:</td><td class="lineno" valign="top"></td></tr>
454	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
455	<tr><td class="lineno" valign="top"></td><td class="left"> o adding or removing whitespace, where allowed in the header field's</td><td> </td><td class="right"> o adding or removing whitespace, where allowed in the header field's</td><td class="lineno" valign="top"></td></tr>
456	<tr><td class="lineno" valign="top"></td><td class="left"> syntax</td><td> </td><td class="right"> syntax</td><td class="lineno" valign="top"></td></tr>
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"> o combining multiple header fields with the same field name (see</td><td> </td><td class="right"> o combining multiple header fields with the same field name (see</td><td class="lineno" valign="top"></td></tr>
459	<tr><td class="lineno" valign="top"></td><td class="left"> Section 3.2 of [Part1])</td><td> </td><td class="right"> Section 3.2 of [Part1])</td><td class="lineno" valign="top"></td></tr>
460	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
461	<tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 18, line 41</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 18, line 10</em></th><td></td></tr>
462	<tr><td class="lineno" valign="top"></td><td class="left"> might have received several ranges of the same representation. A</td><td> </td><td class="right"> might have received several ranges of the same representation. A</td><td class="lineno" valign="top"></td></tr>
463	<tr><td class="lineno" valign="top"></td><td class="left"> cache MAY combine these ranges into a single stored response, and</td><td> </td><td class="right"> cache MAY combine these ranges into a single stored response, and</td><td class="lineno" valign="top"></td></tr>
464	<tr><td class="lineno" valign="top"></td><td class="left"> reuse that response to satisfy later requests, if they all share the</td><td> </td><td class="right"> reuse that response to satisfy later requests, if they all share the</td><td class="lineno" valign="top"></td></tr>
465	<tr><td class="lineno" valign="top"></td><td class="left"> same strong validator and the cache complies with the client</td><td> </td><td class="right"> same strong validator and the cache complies with the client</td><td class="lineno" valign="top"></td></tr>
466	<tr><td class="lineno" valign="top"></td><td class="left"> requirements in Section 4.2 of [Part5].</td><td> </td><td class="right"> requirements in Section 4.2 of [Part5].</td><td class="lineno" valign="top"></td></tr>
467	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
468	<tr><td class="lineno" valign="top"></td><td class="left"> When combining the new response with one or more stored responses, a</td><td> </td><td class="right"> When combining the new response with one or more stored responses, a</td><td class="lineno" valign="top"></td></tr>
469	<tr><td class="lineno" valign="top"></td><td class="left"> cache MUST:</td><td> </td><td class="right"> cache MUST:</td><td class="lineno" valign="top"></td></tr>
470	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
471	<tr><td class="lineno" valign="top"></td><td class="left"> o delete any Warning header fields in the stored response with warn-</td><td> </td><td class="right"> o delete any Warning header fields in the stored response with warn-</td><td class="lineno" valign="top"></td></tr>
472	<tr><td><a name="diff0025" /></td></tr>
473	<tr><td class="lineno" valign="top"></td><td class="lblock"> code 1xx (see Section 7.<span class="delete">6</span>);</td><td> </td><td class="rblock"> code 1xx (see Section 7.<span class="insert">5</span>);</td><td class="lineno" valign="top"></td></tr>
474	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
475	<tr><td class="lineno" valign="top"></td><td class="left"> o retain any Warning header fields in the stored response with warn-</td><td> </td><td class="right"> o retain any Warning header fields in the stored response with warn-</td><td class="lineno" valign="top"></td></tr>
476	<tr><td class="lineno" valign="top"></td><td class="left"> code 2xx; and,</td><td> </td><td class="right"> code 2xx; and,</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"> o use other header fields provided in the new response, aside from</td><td> </td><td class="right"> o use other header fields provided in the new response, aside from</td><td class="lineno" valign="top"></td></tr>
479	<tr><td class="lineno" valign="top"></td><td class="left"> Content-Range, to replace all instances of the corresponding</td><td> </td><td class="right"> Content-Range, to replace all instances of the corresponding</td><td class="lineno" valign="top"></td></tr>
480	<tr><td class="lineno" valign="top"></td><td class="left"> header fields in the stored response.</td><td> </td><td class="right"> header fields in the stored response.</td><td class="lineno" valign="top"></td></tr>
481	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
482	<tr><td class="lineno" valign="top"></td><td class="left">5. Updating Caches with HEAD Responses</td><td> </td><td class="right">5. Updating Caches with HEAD Responses</td><td class="lineno" valign="top"></td></tr>
483	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
484	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
485	<tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 19, line 24</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 18, line 38</em></th><td></td></tr>
486	<tr><td class="lineno" valign="top"></td><td class="left"> Last-Modified value of a HEAD response differs from that in a</td><td> </td><td class="right"> Last-Modified value of a HEAD response differs from that in a</td><td class="lineno" valign="top"></td></tr>
487	<tr><td class="lineno" valign="top"></td><td class="left"> selected GET response, the cache MUST consider that selected response</td><td> </td><td class="right"> selected GET response, the cache MUST consider that selected response</td><td class="lineno" valign="top"></td></tr>
488	<tr><td class="lineno" valign="top"></td><td class="left"> to be stale.</td><td> </td><td class="right"> to be stale.</td><td class="lineno" valign="top"></td></tr>
489	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
490	<tr><td class="lineno" valign="top"></td><td class="left"> If the Content-Length, ETag and Last-Modified values of a HEAD</td><td> </td><td class="right"> If the Content-Length, ETag and Last-Modified values of a HEAD</td><td class="lineno" valign="top"></td></tr>
491	<tr><td class="lineno" valign="top"></td><td class="left"> response (when present) are the same as that in a selected GET</td><td> </td><td class="right"> response (when present) are the same as that in a selected GET</td><td class="lineno" valign="top"></td></tr>
492	<tr><td class="lineno" valign="top"></td><td class="left"> response (as per Section 4.3), the cache SHOULD update the remaining</td><td> </td><td class="right"> response (as per Section 4.3), the cache SHOULD update the remaining</td><td class="lineno" valign="top"></td></tr>
493	<tr><td class="lineno" valign="top"></td><td class="left"> header fields in the stored response using the following rules:</td><td> </td><td class="right"> header fields in the stored response using the following rules:</td><td class="lineno" valign="top"></td></tr>
494	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
495	<tr><td class="lineno" valign="top"></td><td class="left"> o delete any Warning header fields in the stored response with warn-</td><td> </td><td class="right"> o delete any Warning header fields in the stored response with warn-</td><td class="lineno" valign="top"></td></tr>
496	<tr><td><a name="diff0026" /></td></tr>
497	<tr><td class="lineno" valign="top"></td><td class="lblock"> code 1xx (see Section 7.<span class="delete">6</span>);</td><td> </td><td class="rblock"> code 1xx (see Section 7.<span class="insert">5</span>);</td><td class="lineno" valign="top"></td></tr>
498	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
499	<tr><td class="lineno" valign="top"></td><td class="left"> o retain any Warning header fields in the stored response with warn-</td><td> </td><td class="right"> o retain any Warning header fields in the stored response with warn-</td><td class="lineno" valign="top"></td></tr>
500	<tr><td class="lineno" valign="top"></td><td class="left"> code 2xx; and,</td><td> </td><td class="right"> code 2xx; and,</td><td class="lineno" valign="top"></td></tr>
501	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
502	<tr><td class="lineno" valign="top"></td><td class="left"> o use other header fields provided in the response to replace all</td><td> </td><td class="right"> o use other header fields provided in the response to replace all</td><td class="lineno" valign="top"></td></tr>
503	<tr><td class="lineno" valign="top"></td><td class="left"> instances of the corresponding header fields in the stored</td><td> </td><td class="right"> instances of the corresponding header fields in the stored</td><td class="lineno" valign="top"></td></tr>
504	<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>
505	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
506	<tr><td class="lineno" valign="top"></td><td class="left">6. Request Methods that Invalidate</td><td> </td><td class="right">6. Request Methods that Invalidate</td><td class="lineno" valign="top"></td></tr>
507	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
508	<tr><td><a name="diff0027" /></td></tr>
509	<tr><td class="lineno" valign="top"></td><td class="lblock"> Because unsafe request methods (Section <span class="delete">2.1</span>.1 of [Part2]) such as</td><td> </td><td class="rblock"> Because unsafe request methods (Section <span class="insert">5.2</span>.1 of [Part2]) such as</td><td class="lineno" valign="top"></td></tr>
510	<tr><td class="lineno" valign="top"></td><td class="left"> PUT, POST or DELETE have the potential for changing state on the</td><td> </td><td class="right"> PUT, POST or DELETE have the potential for changing state on the</td><td class="lineno" valign="top"></td></tr>
511	<tr><td class="lineno" valign="top"></td><td class="left"> origin server, intervening caches can use them to keep their contents</td><td> </td><td class="right"> origin server, intervening caches can use them to keep their contents</td><td class="lineno" valign="top"></td></tr>
512	<tr><td class="lineno" valign="top"></td><td class="left"> up-to-date.</td><td> </td><td class="right"> up-to-date.</td><td class="lineno" valign="top"></td></tr>
513	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
514	<tr><td class="lineno" valign="top"></td><td class="left"> A cache MUST invalidate the effective Request URI (Section 5.5 of</td><td> </td><td class="right"> A cache MUST invalidate the effective Request URI (Section 5.5 of</td><td class="lineno" valign="top"></td></tr>
515	<tr><td class="lineno" valign="top"></td><td class="left"> [Part1]) as well as the URI(s) in the Location and Content-Location</td><td> </td><td class="right"> [Part1]) as well as the URI(s) in the Location and Content-Location</td><td class="lineno" valign="top"></td></tr>
516	<tr><td class="lineno" valign="top"></td><td class="left"> response header fields (if present) when a non-error response to a</td><td> </td><td class="right"> response header fields (if present) when a non-error response to a</td><td class="lineno" valign="top"></td></tr>
517	<tr><td class="lineno" valign="top"></td><td class="left"> request with an unsafe method is received.</td><td> </td><td class="right"> request with an unsafe method is received.</td><td class="lineno" valign="top"></td></tr>
518	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
519	<tr><td class="lineno" valign="top"></td><td class="left"> However, a cache MUST NOT invalidate a URI from a Location or</td><td> </td><td class="right"> However, a cache MUST NOT invalidate a URI from a Location or</td><td class="lineno" valign="top"></td></tr>
520	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
521	<tr bgcolor="gray" ><td></td><th><a name="part-l12" /><small>skipping to change at</small><em> page 28, line 16</em></th><th> </th><th><a name="part-r12" /><small>skipping to change at</small><em> page 27, line 26</em></th><td></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 class="lineno" valign="top"></td><td class="left"> The "Expires" header field gives the date/time after which the</td><td> </td><td class="right"> The "Expires" header field gives the date/time after which the</td><td class="lineno" valign="top"></td></tr>
524	<tr><td class="lineno" valign="top"></td><td class="left"> response is considered stale. See Section 4.1 for further discussion</td><td> </td><td class="right"> response is considered stale. See Section 4.1 for further discussion</td><td class="lineno" valign="top"></td></tr>
525	<tr><td class="lineno" valign="top"></td><td class="left"> of the freshness model.</td><td> </td><td class="right"> of the freshness model.</td><td class="lineno" valign="top"></td></tr>
526	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
527	<tr><td class="lineno" valign="top"></td><td class="left"> The presence of an Expires field does not imply that the original</td><td> </td><td class="right"> The presence of an Expires field does not imply that the original</td><td class="lineno" valign="top"></td></tr>
528	<tr><td class="lineno" valign="top"></td><td class="left"> resource will change or cease to exist at, before, or after that</td><td> </td><td class="right"> resource will change or cease to exist at, before, or after that</td><td class="lineno" valign="top"></td></tr>
529	<tr><td class="lineno" valign="top"></td><td class="left"> time.</td><td> </td><td class="right"> time.</td><td class="lineno" valign="top"></td></tr>
530	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
531	<tr><td class="lineno" valign="top"></td><td class="left"> The field-value is an absolute date and time as defined by HTTP-date</td><td> </td><td class="right"> The field-value is an absolute date and time as defined by HTTP-date</td><td class="lineno" valign="top"></td></tr>
532	<tr><td><a name="diff0028" /></td></tr>
533	<tr><td class="lineno" valign="top"></td><td class="lblock"> in Section <span class="delete">5.1</span> of [Part2]; a sender MUST use the rfc1123-date format.</td><td> </td><td class="rblock"> in Section <span class="insert">8.1.1.1</span> of [Part2]; a sender MUST use the rfc1123-date</td><td class="lineno" valign="top"></td></tr>
534	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> format.</td><td class="lineno" valign="top"></td></tr>
535	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
536	<tr><td class="lineno" valign="top"></td><td class="left"> Expires = HTTP-date</td><td> </td><td class="right"> Expires = HTTP-date</td><td class="lineno" valign="top"></td></tr>
537	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
538	<tr><td class="lineno" valign="top"></td><td class="left"> For example</td><td> </td><td class="right"> For example</td><td class="lineno" valign="top"></td></tr>
539	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
540	<tr><td class="lineno" valign="top"></td><td class="left"> Expires: Thu, 01 Dec 1994 16:00:00 GMT</td><td> </td><td class="right"> Expires: Thu, 01 Dec 1994 16:00:00 GMT</td><td class="lineno" valign="top"></td></tr>
541	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
542	<tr><td class="lineno" valign="top"></td><td class="left"> A cache MUST treat other invalid date formats, especially including</td><td> </td><td class="right"> A cache MUST treat other invalid date formats, especially including</td><td class="lineno" valign="top"></td></tr>
543	<tr><td class="lineno" valign="top"></td><td class="left"> the value "0", as in the past (i.e., "already expired").</td><td> </td><td class="right"> the value "0", as in the past (i.e., "already expired").</td><td class="lineno" valign="top"></td></tr>
544	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
545	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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547	<tr><td class="lineno" valign="top"></td><td class="left"> Pragma: no-cache</td><td> </td><td class="right"> Pragma: no-cache</td><td class="lineno" valign="top"></td></tr>
548	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
549	<tr><td class="lineno" valign="top"></td><td class="left"> will constrain HTTP/1.1 caches to serve a response no older than 30</td><td> </td><td class="right"> will constrain HTTP/1.1 caches to serve a response no older than 30</td><td class="lineno" valign="top"></td></tr>
550	<tr><td class="lineno" valign="top"></td><td class="left"> seconds, while precluding implementations that do not understand</td><td> </td><td class="right"> seconds, while precluding implementations that do not understand</td><td class="lineno" valign="top"></td></tr>
551	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control from serving a cached response.</td><td> </td><td class="right"> Cache-Control from serving a cached response.</td><td class="lineno" valign="top"></td></tr>
552	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
553	<tr><td class="lineno" valign="top"></td><td class="left"> Note: Because the meaning of "Pragma: no-cache" in responses is</td><td> </td><td class="right"> Note: Because the meaning of "Pragma: no-cache" in responses is</td><td class="lineno" valign="top"></td></tr>
554	<tr><td class="lineno" valign="top"></td><td class="left"> not specified, it does not provide a reliable replacement for</td><td> </td><td class="right"> not specified, it does not provide a reliable replacement for</td><td class="lineno" valign="top"></td></tr>
555	<tr><td class="lineno" valign="top"></td><td class="left"> "Cache-Control: no-cache" in them.</td><td> </td><td class="right"> "Cache-Control: no-cache" in them.</td><td class="lineno" valign="top"></td></tr>
556	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
557	<tr><td><a name="diff0029" /></td></tr>
558	<tr><td class="lineno" valign="top"></td><td class="lblock">7.5. <span class="delete">Vary</span></td><td> </td><td class="rblock">7.5. Warning</td><td class="lineno" valign="top"></td></tr>
559	<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>
560	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> The "Vary" header field conveys the set of header fields that were</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
561	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> used to select the representation.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
562	<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>
563	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Caches use this information, in part, to determine whether a stored</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
564	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> response can be used to satisfy a given request; see Section 4.3.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
565	<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>
566	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> In uncacheable or stale responses, the Vary field value advises the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
567	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> user agent about the criteria that were used to select the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
568	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> representation.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
569	<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>
570	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Vary = "*" / 1#field-name</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
571	<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>
572	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> The set of header fields named by the Vary field value is known as</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
573	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> the selecting header fields.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
574	<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>
575	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> A server SHOULD include a Vary header field with any cacheable</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
576	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> response that is subject to server-driven negotiation. Doing so</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
577	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> allows a cache to properly interpret future requests on that resource</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
578	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> and informs the user agent about the presence of negotiation on that</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
579	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> resource. A server MAY include a Vary header field with a non-</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
580	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> cacheable response that is subject to server-driven negotiation,</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
581	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> since this might provide the user agent with useful information about</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
582	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> the dimensions over which the response varies at the time of the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
583	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> response.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
584	<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>
585	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> A Vary field value of "*" signals that unspecified parameters not</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
586	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> limited to the header fields (e.g., the network address of the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
587	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> client), play a role in the selection of the response representation;</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
588	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> therefore, a cache cannot determine whether this response is</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
589	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> appropriate. A proxy MUST NOT generate the "*" value.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
590	<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>
591	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> The field-names given are not limited to the set of standard header</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
592	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> fields defined by this specification. Field names are case-</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
593	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> insensitive.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
594	<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>
595	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7.6.</span> Warning</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
596	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
597	<tr><td class="lineno" valign="top"></td><td class="left"> The "Warning" header field is used to carry additional information</td><td> </td><td class="right"> The "Warning" header field is used to carry additional information</td><td class="lineno" valign="top"></td></tr>
598	<tr><td class="lineno" valign="top"></td><td class="left"> about the status or transformation of a message that might not be</td><td> </td><td class="right"> about the status or transformation of a message that might not be</td><td class="lineno" valign="top"></td></tr>
599	<tr><td class="lineno" valign="top"></td><td class="left"> reflected in the message. This information is typically used to warn</td><td> </td><td class="right"> reflected in the message. This information is typically used to warn</td><td class="lineno" valign="top"></td></tr>
600	<tr><td class="lineno" valign="top"></td><td class="left"> about possible incorrectness introduced by caching operations or</td><td> </td><td class="right"> about possible incorrectness introduced by caching operations or</td><td class="lineno" valign="top"></td></tr>
601	<tr><td class="lineno" valign="top"></td><td class="left"> transformations applied to the payload of the message.</td><td> </td><td class="right"> transformations applied to the payload of the message.</td><td class="lineno" valign="top"></td></tr>
602	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
603	<tr><td class="lineno" valign="top"></td><td class="left"> Warnings can be used for other purposes, both cache-related and</td><td> </td><td class="right"> Warnings can be used for other purposes, both cache-related and</td><td class="lineno" valign="top"></td></tr>
604	<tr><td class="lineno" valign="top"></td><td class="left"> otherwise. The use of a warning, rather than an error status code,</td><td> </td><td class="right"> otherwise. The use of a warning, rather than an error status code,</td><td class="lineno" valign="top"></td></tr>
605	<tr><td class="lineno" valign="top"></td><td class="left"> distinguishes these responses from true failures.</td><td> </td><td class="right"> distinguishes these responses from true failures.</td><td class="lineno" valign="top"></td></tr>
606	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
607	<tr bgcolor="gray" ><td></td><th><a name="part-l14" /><small>skipping to change at</small><em> page 31, line 47</em></th><th> </th><th><a name="part-r14" /><small>skipping to change at</small><em> page 30, line 21</em></th><td></td></tr>
608	<tr><td class="lineno" valign="top"></td><td class="left"> warn-date, and that warn-date is different from the Date value in the</td><td> </td><td class="right"> warn-date, and that warn-date is different from the Date value in the</td><td class="lineno" valign="top"></td></tr>
609	<tr><td class="lineno" valign="top"></td><td class="left"> response, then that warning-value MUST be deleted from the message</td><td> </td><td class="right"> response, then that warning-value MUST be deleted from the message</td><td class="lineno" valign="top"></td></tr>
610	<tr><td class="lineno" valign="top"></td><td class="left"> before storing, forwarding, or using it. (preventing the consequences</td><td> </td><td class="right"> before storing, forwarding, or using it. (preventing the consequences</td><td class="lineno" valign="top"></td></tr>
611	<tr><td class="lineno" valign="top"></td><td class="left"> of naive caching of Warning header fields.) If all of the warning-</td><td> </td><td class="right"> of naive caching of Warning header fields.) If all of the warning-</td><td class="lineno" valign="top"></td></tr>
612	<tr><td class="lineno" valign="top"></td><td class="left"> values are deleted for this reason, the Warning header field MUST be</td><td> </td><td class="right"> values are deleted for this reason, the Warning header field MUST be</td><td class="lineno" valign="top"></td></tr>
613	<tr><td class="lineno" valign="top"></td><td class="left"> deleted as well.</td><td> </td><td class="right"> deleted as well.</td><td class="lineno" valign="top"></td></tr>
614	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
615	<tr><td class="lineno" valign="top"></td><td class="left"> The following warn-codes are defined by this specification, each with</td><td> </td><td class="right"> The following warn-codes are defined by this specification, each with</td><td class="lineno" valign="top"></td></tr>
616	<tr><td class="lineno" valign="top"></td><td class="left"> a recommended warn-text in English, and a description of its meaning.</td><td> </td><td class="right"> a recommended warn-text in English, and a description of its meaning.</td><td class="lineno" valign="top"></td></tr>
617	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
618	<tr><td><a name="diff0030" /></td></tr>
619	<tr><td class="lineno" valign="top"></td><td class="lblock">7.<span class="delete">6</span>.1. 110 Response is Stale</td><td> </td><td class="rblock">7.<span class="insert">5</span>.1. 110 Response is Stale</td><td class="lineno" valign="top"></td></tr>
620	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
621	<tr><td class="lineno" valign="top"></td><td class="left"> A cache SHOULD include this whenever the returned response is stale.</td><td> </td><td class="right"> A cache SHOULD include this whenever the returned response is stale.</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><a name="diff0031" /></td></tr>
624	<tr><td class="lineno" valign="top"></td><td class="lblock">7.<span class="delete">6</span>.2. 111 Revalidation Failed</td><td> </td><td class="rblock">7.<span class="insert">5</span>.2. 111 Revalidation Failed</td><td class="lineno" valign="top"></td></tr>
625	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
626	<tr><td class="lineno" valign="top"></td><td class="left"> A cache SHOULD include this when returning a stale response because</td><td> </td><td class="right"> A cache SHOULD include this when returning a stale response because</td><td class="lineno" valign="top"></td></tr>
627	<tr><td class="lineno" valign="top"></td><td class="left"> an attempt to validate the response failed, due to an inability to</td><td> </td><td class="right"> an attempt to validate the response failed, due to an inability to</td><td class="lineno" valign="top"></td></tr>
628	<tr><td class="lineno" valign="top"></td><td class="left"> reach the server.</td><td> </td><td class="right"> reach the server.</td><td class="lineno" valign="top"></td></tr>
629	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
630	<tr><td><a name="diff0032" /></td></tr>
631	<tr><td class="lineno" valign="top"></td><td class="lblock">7.<span class="delete">6</span>.3. 112 Disconnected Operation</td><td> </td><td class="rblock">7.<span class="insert">5</span>.3. 112 Disconnected Operation</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"> A cache SHOULD include this if it is intentionally disconnected from</td><td> </td><td class="right"> A cache SHOULD include this if it is intentionally disconnected from</td><td class="lineno" valign="top"></td></tr>
634	<tr><td class="lineno" valign="top"></td><td class="left"> the rest of the network for a period of time.</td><td> </td><td class="right"> the rest of the network for a period of time.</td><td class="lineno" valign="top"></td></tr>
635	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
636	<tr><td><a name="diff0033" /></td></tr>
637	<tr><td class="lineno" valign="top"></td><td class="lblock">7.<span class="delete">6</span>.4. 113 Heuristic Expiration</td><td> </td><td class="rblock">7.<span class="insert">5</span>.4. 113 Heuristic Expiration</td><td class="lineno" valign="top"></td></tr>
638	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
639	<tr><td class="lineno" valign="top"></td><td class="left"> A cache SHOULD include this if it heuristically chose a freshness</td><td> </td><td class="right"> A cache SHOULD include this if it heuristically chose a freshness</td><td class="lineno" valign="top"></td></tr>
640	<tr><td class="lineno" valign="top"></td><td class="left"> lifetime greater than 24 hours and the response's age is greater than</td><td> </td><td class="right"> lifetime greater than 24 hours and the response's age is greater than</td><td class="lineno" valign="top"></td></tr>
641	<tr><td class="lineno" valign="top"></td><td class="left"> 24 hours.</td><td> </td><td class="right"> 24 hours.</td><td class="lineno" valign="top"></td></tr>
642	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
643	<tr><td><a name="diff0034" /></td></tr>
644	<tr><td class="lineno" valign="top"></td><td class="lblock">7.<span class="delete">6</span>.5. 199 Miscellaneous Warning</td><td> </td><td class="rblock">7.<span class="insert">5</span>.5. 199 Miscellaneous Warning</td><td class="lineno" valign="top"></td></tr>
645	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
646	<tr><td class="lineno" valign="top"></td><td class="left"> The warning text can include arbitrary information to be presented to</td><td> </td><td class="right"> The warning text can include arbitrary information to be presented to</td><td class="lineno" valign="top"></td></tr>
647	<tr><td class="lineno" valign="top"></td><td class="left"> a human user, or logged. A system receiving this warning MUST NOT</td><td> </td><td class="right"> a human user, or logged. A system receiving this warning MUST NOT</td><td class="lineno" valign="top"></td></tr>
648	<tr><td class="lineno" valign="top"></td><td class="left"> take any automated action, besides presenting the warning to the</td><td> </td><td class="right"> take any automated action, besides presenting the warning to the</td><td class="lineno" valign="top"></td></tr>
649	<tr><td class="lineno" valign="top"></td><td class="left"> user.</td><td> </td><td class="right"> user.</td><td class="lineno" valign="top"></td></tr>
650	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
651	<tr><td><a name="diff0035" /></td></tr>
652	<tr><td class="lineno" valign="top"></td><td class="lblock">7.<span class="delete">6</span>.6. 214 Transformation Applied</td><td> </td><td class="rblock">7.<span class="insert">5</span>.6. 214 Transformation Applied</td><td class="lineno" valign="top"></td></tr>
653	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
654	<tr><td class="lineno" valign="top"></td><td class="left"> MUST be added by a proxy if it applies any transformation to the</td><td> </td><td class="right"> MUST be added by a proxy if it applies any transformation to the</td><td class="lineno" valign="top"></td></tr>
655	<tr><td class="lineno" valign="top"></td><td class="left"> representation, such as changing the content-coding, media-type, or</td><td> </td><td class="right"> representation, such as changing the content-coding, media-type, or</td><td class="lineno" valign="top"></td></tr>
656	<tr><td class="lineno" valign="top"></td><td class="left"> modifying the representation data, unless this Warning code already</td><td> </td><td class="right"> modifying the representation data, unless this Warning code already</td><td class="lineno" valign="top"></td></tr>
657	<tr><td class="lineno" valign="top"></td><td class="left"> appears in the response.</td><td> </td><td class="right"> appears in the response.</td><td class="lineno" valign="top"></td></tr>
658	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
659	<tr><td><a name="diff0036" /></td></tr>
660	<tr><td class="lineno" valign="top"></td><td class="lblock">7.<span class="delete">6</span>.7. 299 Miscellaneous Persistent Warning</td><td> </td><td class="rblock">7.<span class="insert">5</span>.7. 299 Miscellaneous Persistent Warning</td><td class="lineno" valign="top"></td></tr>
661	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
662	<tr><td class="lineno" valign="top"></td><td class="left"> The warning text can include arbitrary information to be presented to</td><td> </td><td class="right"> The warning text can include arbitrary information to be presented to</td><td class="lineno" valign="top"></td></tr>
663	<tr><td class="lineno" valign="top"></td><td class="left"> a human user, or logged. A system receiving this warning MUST NOT</td><td> </td><td class="right"> a human user, or logged. A system receiving this warning MUST NOT</td><td class="lineno" valign="top"></td></tr>
664	<tr><td class="lineno" valign="top"></td><td class="left"> take any automated action.</td><td> </td><td class="right"> take any automated action.</td><td class="lineno" valign="top"></td></tr>
665	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
666	<tr><td><a name="diff0037" /></td></tr>
667	<tr><td class="lineno" valign="top"></td><td class="lblock">7.<span class="delete">6</span>.8. Warn Code Extensions</td><td> </td><td class="rblock">7.<span class="insert">5</span>.8. Warn Code Extensions</td><td class="lineno" valign="top"></td></tr>
668	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
669	<tr><td class="lineno" valign="top"></td><td class="left"> The HTTP Warn Code Registry defines the name space for warn codes.</td><td> </td><td class="right"> The HTTP Warn Code Registry defines the name space for warn codes.</td><td class="lineno" valign="top"></td></tr>
670	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
671	<tr><td class="lineno" valign="top"></td><td class="left"> A registration MUST include the following fields:</td><td> </td><td class="right"> A registration MUST include the following fields:</td><td class="lineno" valign="top"></td></tr>
672	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
673	<tr><td class="lineno" valign="top"></td><td class="left"> o Warn Code (3 digits)</td><td> </td><td class="right"> o Warn Code (3 digits)</td><td class="lineno" valign="top"></td></tr>
674	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
675	<tr><td class="lineno" valign="top"></td><td class="left"> o Short Description</td><td> </td><td class="right"> o Short Description</td><td class="lineno" valign="top"></td></tr>
676	<tr><td><a name="diff0038" /></td></tr>
677	<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>
678	<tr><td class="lineno" valign="top"></td><td class="left"> o Pointer to specification text</td><td> </td><td class="right"> o Pointer to specification text</td><td class="lineno" valign="top"></td></tr>
679	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
680	<tr><td class="lineno" valign="top"></td><td class="left"> Values to be added to this name space require IETF Review (see</td><td> </td><td class="right"> Values to be added to this name space require IETF Review (see</td><td class="lineno" valign="top"></td></tr>
681	<tr><td class="lineno" valign="top"></td><td class="left"> [RFC5226], Section 4.1).</td><td> </td><td class="right"> [RFC5226], Section 4.1).</td><td class="lineno" valign="top"></td></tr>
682	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
683	<tr><td class="lineno" valign="top"></td><td class="left"> The registry itself is maintained at</td><td> </td><td class="right"> The registry itself is maintained at</td><td class="lineno" valign="top"></td></tr>
684	<tr><td class="lineno" valign="top"></td><td class="left"> <http://www.iana.org/assignments/http-warn-codes>.</td><td> </td><td class="right"> <http://www.iana.org/assignments/http-warn-codes>.</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">8. History Lists</td><td> </td><td class="right">8. History Lists</td><td class="lineno" valign="top"></td></tr>
687	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
688	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
689	<tr bgcolor="gray" ><td></td><th><a name="part-l15" /><small>skipping to change at</small><em> page 34, line 27</em></th><th> </th><th><a name="part-r15" /><small>skipping to change at</small><em> page 32, line 31</em></th><td></td></tr>
690	<tr><td class="lineno" valign="top"></td><td class="left"> \| proxy-revalidate \| Section 7.2.2.6 \|</td><td> </td><td class="right"> \| proxy-revalidate \| Section 7.2.2.6 \|</td><td class="lineno" valign="top"></td></tr>
691	<tr><td class="lineno" valign="top"></td><td class="left"> \| public \| Section 7.2.2.1 \|</td><td> </td><td class="right"> \| public \| Section 7.2.2.1 \|</td><td class="lineno" valign="top"></td></tr>
692	<tr><td class="lineno" valign="top"></td><td class="left"> \| s-maxage \| Section 7.2.2.8 \|</td><td> </td><td class="right"> \| s-maxage \| Section 7.2.2.8 \|</td><td class="lineno" valign="top"></td></tr>
693	<tr><td class="lineno" valign="top"></td><td class="left"> \| stale-if-error \| [RFC5861], Section 4 \|</td><td> </td><td class="right"> \| stale-if-error \| [RFC5861], Section 4 \|</td><td class="lineno" valign="top"></td></tr>
694	<tr><td class="lineno" valign="top"></td><td class="left"> \| stale-while-revalidate \| [RFC5861], Section 3 \|</td><td> </td><td class="right"> \| stale-while-revalidate \| [RFC5861], Section 3 \|</td><td class="lineno" valign="top"></td></tr>
695	<tr><td class="lineno" valign="top"></td><td class="left"> +------------------------+----------------------------------+</td><td> </td><td class="right"> +------------------------+----------------------------------+</td><td class="lineno" valign="top"></td></tr>
696	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
697	<tr><td class="lineno" valign="top"></td><td class="left">9.2. Warn Code Registry</td><td> </td><td class="right">9.2. Warn Code Registry</td><td class="lineno" valign="top"></td></tr>
698	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
699	<tr><td class="lineno" valign="top"></td><td class="left"> The registration procedure for HTTP Warn Codes is defined by</td><td> </td><td class="right"> The registration procedure for HTTP Warn Codes is defined by</td><td class="lineno" valign="top"></td></tr>
700	<tr><td><a name="diff0039" /></td></tr>
701	<tr><td class="lineno" valign="top"></td><td class="lblock"> Section 7.<span class="delete">6</span>.8 of this document.</td><td> </td><td class="rblock"> Section 7.<span class="insert">5</span>.8 of this document.</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"> The HTTP Warn Code Registry shall be created at</td><td> </td><td class="right"> The HTTP Warn Code Registry shall be created at</td><td class="lineno" valign="top"></td></tr>
704	<tr><td class="lineno" valign="top"></td><td class="left"> <http://www.iana.org/assignments/http-cache-directives> and be</td><td> </td><td class="right"> <http://www.iana.org/assignments/http-cache-directives> and be</td><td class="lineno" valign="top"></td></tr>
705	<tr><td class="lineno" valign="top"></td><td class="left"> populated with the registrations below:</td><td> </td><td class="right"> populated with the registrations below:</td><td class="lineno" valign="top"></td></tr>
706	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
707	<tr><td class="lineno" valign="top"></td><td class="left"> +-----------+----------------------------------+---------------+</td><td> </td><td class="right"> +-----------+----------------------------------+---------------+</td><td class="lineno" valign="top"></td></tr>
708	<tr><td class="lineno" valign="top"></td><td class="left"> \| Warn Code \| Short Description \| Reference \|</td><td> </td><td class="right"> \| Warn Code \| Short Description \| Reference \|</td><td class="lineno" valign="top"></td></tr>
709	<tr><td class="lineno" valign="top"></td><td class="left"> +-----------+----------------------------------+---------------+</td><td> </td><td class="right"> +-----------+----------------------------------+---------------+</td><td class="lineno" valign="top"></td></tr>
710	<tr><td><a name="diff0040" /></td></tr>
711	<tr><td class="lineno" valign="top"></td><td class="lblock"> \| 110 \| Response is Stale \| Section <span class="delete">7.6.1</span> \|</td><td> </td><td class="rblock"> \| 110 \| Response is Stale \| Section <span class="insert">7.5.1</span> \|</td><td class="lineno" valign="top"></td></tr>
712	<tr><td class="lineno" valign="top"></td><td class="lblock"> \| 111 \| Revalidation Failed \| Section <span class="delete">7.6.2</span> \|</td><td> </td><td class="rblock"> \| 111 \| Revalidation Failed \| Section <span class="insert">7.5.2</span> \|</td><td class="lineno" valign="top"></td></tr>
713	<tr><td class="lineno" valign="top"></td><td class="lblock"> \| 112 \| Disconnected Operation \| Section <span class="delete">7.6.3</span> \|</td><td> </td><td class="rblock"> \| 112 \| Disconnected Operation \| Section <span class="insert">7.5.3</span> \|</td><td class="lineno" valign="top"></td></tr>
714	<tr><td class="lineno" valign="top"></td><td class="lblock"> \| 113 \| Heuristic Expiration \| Section <span class="delete">7.6.4</span> \|</td><td> </td><td class="rblock"> \| 113 \| Heuristic Expiration \| Section <span class="insert">7.5.4</span> \|</td><td class="lineno" valign="top"></td></tr>
715	<tr><td class="lineno" valign="top"></td><td class="lblock"> \| 199 \| Miscellaneous Warning \| Section <span class="delete">7.6.5</span> \|</td><td> </td><td class="rblock"> \| 199 \| Miscellaneous Warning \| Section <span class="insert">7.5.5</span> \|</td><td class="lineno" valign="top"></td></tr>
716	<tr><td class="lineno" valign="top"></td><td class="lblock"> \| 214 \| Transformation Applied \| Section <span class="delete">7.6.6</span> \|</td><td> </td><td class="rblock"> \| 214 \| Transformation Applied \| Section <span class="insert">7.5.6</span> \|</td><td class="lineno" valign="top"></td></tr>
717	<tr><td class="lineno" valign="top"></td><td class="lblock"> \| 299 \| Miscellaneous Persistent Warning \| Section <span class="delete">7.6.7</span> \|</td><td> </td><td class="rblock"> \| 299 \| Miscellaneous Persistent Warning \| Section <span class="insert">7.5.7</span> \|</td><td class="lineno" valign="top"></td></tr>
718	<tr><td class="lineno" valign="top"></td><td class="left"> +-----------+----------------------------------+---------------+</td><td> </td><td class="right"> +-----------+----------------------------------+---------------+</td><td class="lineno" valign="top"></td></tr>
719	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
720	<tr><td class="lineno" valign="top"></td><td class="left">9.3. Header Field Registration</td><td> </td><td class="right">9.3. Header Field Registration</td><td class="lineno" valign="top"></td></tr>
721	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
722	<tr><td class="lineno" valign="top"></td><td class="left"> The Message Header Field Registry located at <http://www.iana.org/</td><td> </td><td class="right"> The Message Header Field Registry located at <http://www.iana.org/</td><td class="lineno" valign="top"></td></tr>
723	<tr><td class="lineno" valign="top"></td><td class="left"> assignments/message-headers/message-header-index.html> shall be</td><td> </td><td class="right"> assignments/message-headers/message-header-index.html> shall be</td><td class="lineno" valign="top"></td></tr>
724	<tr><td class="lineno" valign="top"></td><td class="left"> updated with the permanent registrations below (see [RFC3864]):</td><td> </td><td class="right"> updated with the permanent registrations below (see [RFC3864]):</td><td class="lineno" valign="top"></td></tr>
725	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
726	<tr><td class="lineno" valign="top"></td><td class="left"> +-------------------+----------+----------+-------------+</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"> \| Header Field Name \| Protocol \| Status \| Reference \|</td><td> </td><td class="right"> \| Header Field Name \| Protocol \| Status \| Reference \|</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"> \| Age \| http \| standard \| Section 7.1 \|</td><td> </td><td class="right"> \| Age \| http \| standard \| Section 7.1 \|</td><td class="lineno" valign="top"></td></tr>
730	<tr><td class="lineno" valign="top"></td><td class="left"> \| Cache-Control \| http \| standard \| Section 7.2 \|</td><td> </td><td class="right"> \| Cache-Control \| http \| standard \| Section 7.2 \|</td><td class="lineno" valign="top"></td></tr>
731	<tr><td class="lineno" valign="top"></td><td class="left"> \| Expires \| http \| standard \| Section 7.3 \|</td><td> </td><td class="right"> \| Expires \| http \| standard \| Section 7.3 \|</td><td class="lineno" valign="top"></td></tr>
732	<tr><td class="lineno" valign="top"></td><td class="left"> \| Pragma \| http \| standard \| Section 7.4 \|</td><td> </td><td class="right"> \| Pragma \| http \| standard \| Section 7.4 \|</td><td class="lineno" valign="top"></td></tr>
733	<tr><td><a name="diff0041" /></td></tr>
734	<tr><td class="lineno" valign="top"></td><td class="lblock"> \| <span class="delete">Vary \| http \| standard \| Section 7.5 \|</span></td><td> </td><td class="rblock"> \| Warning \| http \| standard \| Section <span class="insert">7.5</span> \|</td><td class="lineno" valign="top"></td></tr>
735	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> \|</span> Warning \| http \| standard \| Section <span class="delete">7.6</span> \|</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
736	<tr><td class="lineno" valign="top"></td><td class="left"> +-------------------+----------+----------+-------------+</td><td> </td><td class="right"> +-------------------+----------+----------+-------------+</td><td class="lineno" valign="top"></td></tr>
737	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
738	<tr><td class="lineno" valign="top"></td><td class="left"> The change controller is: "IETF (iesg@ietf.org) - Internet</td><td> </td><td class="right"> The change controller is: "IETF (iesg@ietf.org) - Internet</td><td class="lineno" valign="top"></td></tr>
739	<tr><td class="lineno" valign="top"></td><td class="left"> Engineering Task Force".</td><td> </td><td class="right"> Engineering Task Force".</td><td class="lineno" valign="top"></td></tr>
740	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
741	<tr><td class="lineno" valign="top"></td><td class="left">10. Security Considerations</td><td> </td><td class="right">10. Security Considerations</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"> Caches expose additional potential vulnerabilities, since the</td><td> </td><td class="right"> Caches expose additional potential vulnerabilities, since the</td><td class="lineno" valign="top"></td></tr>
744	<tr><td class="lineno" valign="top"></td><td class="left"> contents of the cache represent an attractive target for malicious</td><td> </td><td class="right"> contents of the cache represent an attractive target for malicious</td><td class="lineno" valign="top"></td></tr>
745	<tr><td class="lineno" valign="top"></td><td class="left"> exploitation. Because cache contents persist after an HTTP request</td><td> </td><td class="right"> exploitation. Because cache contents persist after an HTTP request</td><td class="lineno" valign="top"></td></tr>
746	<tr><td class="lineno" valign="top"></td><td class="left"> is complete, an attack on the cache can reveal information long after</td><td> </td><td class="right"> is complete, an attack on the cache can reveal information long after</td><td class="lineno" valign="top"></td></tr>
747	<tr><td class="lineno" valign="top"></td><td class="left"> a user believes that the information has been removed from the</td><td> </td><td class="right"> a user believes that the information has been removed from the</td><td class="lineno" valign="top"></td></tr>
748	<tr><td class="lineno" valign="top"></td><td class="left"> network. Therefore, cache contents need to be protected as sensitive</td><td> </td><td class="right"> network. Therefore, cache contents need to be protected as sensitive</td><td class="lineno" valign="top"></td></tr>
749	<tr><td class="lineno" valign="top"></td><td class="left"> information.</td><td> </td><td class="right"> information.</td><td class="lineno" valign="top"></td></tr>
750	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
751	<tr><td><a name="diff0042" /></td></tr>
752	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> <span class="insert">Implementation flaws might allow attackers to insert content into a</span></td><td class="lineno" valign="top"></td></tr>
753	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> cache ("cache poisoning"), leading to compromise of clients that</span></td><td class="lineno" valign="top"></td></tr>
754	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> trust that content. Because of their nature, these attacks are</span></td><td class="lineno" valign="top"></td></tr>
755	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> difficult to mitigate.</span></td><td class="lineno" valign="top"></td></tr>
756	<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>
757	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Likewise, implementation flaws (as well as misunderstanding of cache</span></td><td class="lineno" valign="top"></td></tr>
758	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> operation) might lead to caching of sensitive information (e.g.,</span></td><td class="lineno" valign="top"></td></tr>
759	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> authentication credentials) that is thought to be private, exposing</span></td><td class="lineno" valign="top"></td></tr>
760	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> it to unauthorised parties.</span></td><td class="lineno" valign="top"></td></tr>
761	<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>
762	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Note that the Set-Cookie response header [RFC6265] does not inhibit</span></td><td class="lineno" valign="top"></td></tr>
763	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> caching; a cacheable response with a Set-Cookie header can be (and</span></td><td class="lineno" valign="top"></td></tr>
764	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> often is) used to satisfy subsequent requests to caches. Servers who</span></td><td class="lineno" valign="top"></td></tr>
765	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> wish to control caching of these responses are encouraged to emit</span></td><td class="lineno" valign="top"></td></tr>
766	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> appropriate Cache-Control response headers.</span></td><td class="lineno" valign="top"></td></tr>
767	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> </td><td class="lineno" valign="top"></td></tr>
768	<tr><td class="lineno" valign="top"></td><td class="left">11. Acknowledgments</td><td> </td><td class="right">11. Acknowledgments</td><td class="lineno" valign="top"></td></tr>
769	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
770	<tr><td class="lineno" valign="top"></td><td class="left"> See Section 9 of [Part1].</td><td> </td><td class="right"> See Section 9 of [Part1].</td><td class="lineno" valign="top"></td></tr>
771	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
772	<tr><td class="lineno" valign="top"></td><td class="left">12. References</td><td> </td><td class="right">12. References</td><td class="lineno" valign="top"></td></tr>
773	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
774	<tr><td class="lineno" valign="top"></td><td class="left">12.1. Normative References</td><td> </td><td class="right">12.1. Normative References</td><td class="lineno" valign="top"></td></tr>
775	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
776	<tr><td><a name="diff0043" /></td></tr>
777	<tr><td class="lineno" valign="top"></td><td class="lblock"> [Part1] Fielding, R., <span class="delete">Ed., Lafon, Y., Ed.,</span> and J. Reschke, Ed.,</td><td> </td><td class="rblock"> [Part1] Fielding, R., <span class="insert">Ed.</span> and J. Reschke, Ed., <span class="insert">"Hypertext Transfer</span></td><td class="lineno" valign="top"></td></tr>
778	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">"HTTP/1.1, part 1:</span> Message <span class="delete">Routing</span> and <span class="delete">Syntax"",</span></td><td> </td><td class="rblock"><span class="insert"> Protocol (HTTP/1.1):</span> Message <span class="insert">Syntax</span> and <span class="insert">Routing",</span></td><td class="lineno" valign="top"></td></tr>
779	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> draft-ietf-httpbis-p1-messaging-20</span> (work in progress),</td><td> </td><td class="rblock"><span class="insert"> draft-ietf-httpbis-p1-messaging-21</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
780	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">July</span> 2012.</td><td> </td><td class="rblock"> <span class="insert">October</span> 2012.</td><td class="lineno" valign="top"></td></tr>
781	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
782	<tr><td><a name="diff0044" /></td></tr>
783	<tr><td class="lineno" valign="top"></td><td class="lblock"> [Part2] Fielding, R., <span class="delete">Ed., Lafon, Y., Ed.,</span> and J. Reschke, Ed.,</td><td> </td><td class="rblock"> [Part2] Fielding, R., <span class="insert">Ed.</span> and J. Reschke, Ed., <span class="insert">"Hypertext Transfer</span></td><td class="lineno" valign="top"></td></tr>
784	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">"HTTP/1.1, part 2:</span> Semantics and <span class="delete">Payloads",</span></td><td> </td><td class="rblock"><span class="insert"> Protocol (HTTP/1.1):</span> Semantics and <span class="insert">Content",</span></td><td class="lineno" valign="top"></td></tr>
785	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> draft-ietf-httpbis-p2-semantics-20</span> (work in progress),</td><td> </td><td class="rblock"><span class="insert"> draft-ietf-httpbis-p2-semantics-21</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
786	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">July</span> 2012.</td><td> </td><td class="rblock"> <span class="insert">October</span> 2012.</td><td class="lineno" valign="top"></td></tr>
787	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
788	<tr><td><a name="diff0045" /></td></tr>
789	<tr><td class="lineno" valign="top"></td><td class="lblock"> [Part4] Fielding, R., <span class="delete">Ed., Lafon, Y., Ed.,</span> and J. Reschke, Ed.,</td><td> </td><td class="rblock"> [Part4] Fielding, R., <span class="insert">Ed.</span> and J. Reschke, Ed., <span class="insert">"Hypertext Transfer</span></td><td class="lineno" valign="top"></td></tr>
790	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">"HTTP/1.1, part 4:</span> Conditional Requests",</td><td> </td><td class="rblock"><span class="insert"> Protocol (HTTP/1.1):</span> Conditional Requests",</td><td class="lineno" valign="top"></td></tr>
791	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">draft-ietf-httpbis-p4-conditional-20</span> (work in progress),</td><td> </td><td class="rblock"> <span class="insert">draft-ietf-httpbis-p4-conditional-21</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
792	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">July</span> 2012.</td><td> </td><td class="rblock"> <span class="insert">October</span> 2012.</td><td class="lineno" valign="top"></td></tr>
793	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
794	<tr><td class="lineno" valign="top"></td><td class="left"> [Part5] Fielding, R., Ed., Lafon, Y., Ed., and J. Reschke, Ed.,</td><td> </td><td class="right"> [Part5] Fielding, R., Ed., Lafon, Y., Ed., and J. Reschke, Ed.,</td><td class="lineno" valign="top"></td></tr>
795	<tr><td><a name="diff0046" /></td></tr>
796	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">"HTTP/1.1, part 5:</span> Range Requests",</td><td> </td><td class="rblock"> <span class="insert">"Hypertext Transfer Protocol (HTTP/1.1):</span> Range Requests",</td><td class="lineno" valign="top"></td></tr>
797	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">draft-ietf-httpbis-p5-range-20</span> (work in progress),</td><td> </td><td class="rblock"> <span class="insert">draft-ietf-httpbis-p5-range-21</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
798	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">July</span> 2012.</td><td> </td><td class="rblock"> <span class="insert">October</span> 2012.</td><td class="lineno" valign="top"></td></tr>
799	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
800	<tr><td><a name="diff0047" /></td></tr>
801	<tr><td class="lineno" valign="top"></td><td class="lblock"> [Part7] Fielding, R., <span class="delete">Ed., Lafon, Y., Ed.,</span> and J. Reschke, Ed.,</td><td> </td><td class="rblock"> [Part7] Fielding, R., <span class="insert">Ed.</span> and J. Reschke, Ed., <span class="insert">"Hypertext Transfer</span></td><td class="lineno" valign="top"></td></tr>
802	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">"HTTP/1.1, part 7:</span> Authentication",</td><td> </td><td class="rblock"><span class="insert"> Protocol (HTTP/1.1):</span> Authentication",</td><td class="lineno" valign="top"></td></tr>
803	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">draft-ietf-httpbis-p7-auth-20</span> (work in progress),</td><td> </td><td class="rblock"> <span class="insert">draft-ietf-httpbis-p7-auth-21</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
804	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">July</span> 2012.</td><td> </td><td class="rblock"> <span class="insert">October</span> 2012.</td><td class="lineno" valign="top"></td></tr>
805	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
806	<tr><td class="lineno" valign="top"></td><td class="left"> [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate</td><td> </td><td class="right"> [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate</td><td class="lineno" valign="top"></td></tr>
807	<tr><td class="lineno" valign="top"></td><td class="left"> Requirement Levels", BCP 14, RFC 2119, March 1997.</td><td> </td><td class="right"> Requirement Levels", BCP 14, RFC 2119, March 1997.</td><td class="lineno" valign="top"></td></tr>
808	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
809	<tr><td class="lineno" valign="top"></td><td class="left"> [RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax</td><td> </td><td class="right"> [RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax</td><td class="lineno" valign="top"></td></tr>
810	<tr><td class="lineno" valign="top"></td><td class="left"> Specifications: ABNF", STD 68, RFC 5234, January 2008.</td><td> </td><td class="right"> Specifications: ABNF", STD 68, RFC 5234, January 2008.</td><td class="lineno" valign="top"></td></tr>
811	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
812	<tr><td class="lineno" valign="top"></td><td class="left">12.2. Informative References</td><td> </td><td class="right">12.2. Informative References</td><td class="lineno" valign="top"></td></tr>
813	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
814	<tr><td class="lineno" valign="top"></td><td class="left"> [RFC1305] Mills, D., "Network Time Protocol (Version 3)</td><td> </td><td class="right"> [RFC1305] Mills, D., "Network Time Protocol (Version 3)</td><td class="lineno" valign="top"></td></tr>
815	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
816	<tr bgcolor="gray" ><td></td><th><a name="part-l16" /><small>skipping to change at</small><em> page 36, line 39</em></th><th> </th><th><a name="part-r16" /><small>skipping to change at</small><em> page 35, line 16</em></th><td></td></tr>
817	<tr><td class="lineno" valign="top"></td><td class="left"> Procedures for Message Header Fields", BCP 90, RFC 3864,</td><td> </td><td class="right"> Procedures for Message Header Fields", BCP 90, RFC 3864,</td><td class="lineno" valign="top"></td></tr>
818	<tr><td class="lineno" valign="top"></td><td class="left"> September 2004.</td><td> </td><td class="right"> September 2004.</td><td class="lineno" valign="top"></td></tr>
819	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
820	<tr><td class="lineno" valign="top"></td><td class="left"> [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an</td><td> </td><td class="right"> [RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an</td><td class="lineno" valign="top"></td></tr>
821	<tr><td class="lineno" valign="top"></td><td class="left"> IANA Considerations Section in RFCs", BCP 26, RFC 5226,</td><td> </td><td class="right"> IANA Considerations Section in RFCs", BCP 26, RFC 5226,</td><td class="lineno" valign="top"></td></tr>
822	<tr><td class="lineno" valign="top"></td><td class="left"> May 2008.</td><td> </td><td class="right"> May 2008.</td><td class="lineno" valign="top"></td></tr>
823	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
824	<tr><td class="lineno" valign="top"></td><td class="left"> [RFC5861] Nottingham, M., "HTTP Cache-Control Extensions for Stale</td><td> </td><td class="right"> [RFC5861] Nottingham, M., "HTTP Cache-Control Extensions for Stale</td><td class="lineno" valign="top"></td></tr>
825	<tr><td class="lineno" valign="top"></td><td class="left"> Content", RFC 5861, April 2010.</td><td> </td><td class="right"> Content", RFC 5861, April 2010.</td><td class="lineno" valign="top"></td></tr>
826	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
827	<tr><td><a name="diff0048" /></td></tr>
828	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> <span class="insert">[RFC6265] Barth, A., "HTTP State Management Mechanism", RFC 6265,</span></td><td class="lineno" valign="top"></td></tr>
829	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> April 2011.</span></td><td class="lineno" valign="top"></td></tr>
830	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> </td><td class="lineno" valign="top"></td></tr>
831	<tr><td class="lineno" valign="top"></td><td class="left">Appendix A. Changes from RFC 2616</td><td> </td><td class="right">Appendix A. Changes from RFC 2616</td><td class="lineno" valign="top"></td></tr>
832	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
833	<tr><td class="lineno" valign="top"></td><td class="left"> Make the specified age calculation algorithm less conservative.</td><td> </td><td class="right"> Make the specified age calculation algorithm less conservative.</td><td class="lineno" valign="top"></td></tr>
834	<tr><td class="lineno" valign="top"></td><td class="left"> (Section 4.1.3)</td><td> </td><td class="right"> (Section 4.1.3)</td><td class="lineno" valign="top"></td></tr>
835	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
836	<tr><td><a name="diff0049" /></td></tr>
837	<tr><td class="lineno" valign="top"></td><td class="lblock"> Remove requirement to consider <span class="delete">Content-Location</span> in successful</td><td> </td><td class="rblock"> Remove requirement to consider <span class="insert">"Content-Location"</span> in successful</td><td class="lineno" valign="top"></td></tr>
838	<tr><td class="lineno" valign="top"></td><td class="left"> responses in order to determine the appropriate response to use.</td><td> </td><td class="right"> responses in order to determine the appropriate response to use.</td><td class="lineno" valign="top"></td></tr>
839	<tr><td class="lineno" valign="top"></td><td class="left"> (Section 4.2)</td><td> </td><td class="right"> (Section 4.2)</td><td class="lineno" valign="top"></td></tr>
840	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
841	<tr><td class="lineno" valign="top"></td><td class="left"> Clarify denial of service attack avoidance requirement. (Section 6)</td><td> </td><td class="right"> Clarify denial of service attack avoidance requirement. (Section 6)</td><td class="lineno" valign="top"></td></tr>
842	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
843	<tr><td><a name="diff0050" /></td></tr>
844	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Change ABNF productions for header fields to only define the field</span></td><td> </td><td class="rblock"> Do not mention RFC 2047 encoding and multiple languages in <span class="insert">"Warning"</span></td><td class="lineno" valign="top"></td></tr>
845	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> value. (Section 7)</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
846	<tr><td class="lineno" valign="top"></td><td class="lblock"> Do not mention RFC 2047 encoding and multiple languages in <span class="delete">Warning</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
847	<tr><td class="lineno" valign="top"></td><td class="left"> header fields anymore, as these aspects never were implemented.</td><td> </td><td class="right"> header fields anymore, as these aspects never were implemented.</td><td class="lineno" valign="top"></td></tr>
848	<tr><td><a name="diff0051" /></td></tr>
849	<tr><td class="lineno" valign="top"></td><td class="lblock"> (Section 7.<span class="delete">6</span>)</td><td> </td><td class="rblock"> (Section 7.<span class="insert">5</span>)</td><td class="lineno" valign="top"></td></tr>
850	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
851	<tr><td class="lineno" valign="top"></td><td class="left"> Introduce Cache Directive and Warn Code Registries. (Section 7.2.3</td><td> </td><td class="right"> Introduce Cache Directive and Warn Code Registries. (Section 7.2.3</td><td class="lineno" valign="top"></td></tr>
852	<tr><td><a name="diff0052" /></td></tr>
853	<tr><td class="lineno" valign="top"></td><td class="lblock"> and Section 7.<span class="delete">6</span>.8)</td><td> </td><td class="rblock"> and Section 7.<span class="insert">5</span>.8)</td><td class="lineno" valign="top"></td></tr>
854	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
855	<tr><td class="lineno" valign="top"></td><td class="left">Appendix B. Imported ABNF</td><td> </td><td class="right">Appendix B. Imported ABNF</td><td class="lineno" valign="top"></td></tr>
856	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
857	<tr><td class="lineno" valign="top"></td><td class="left"> The following core rules are included by reference, as defined in</td><td> </td><td class="right"> The following core rules are included by reference, as defined in</td><td class="lineno" valign="top"></td></tr>
858	<tr><td class="lineno" valign="top"></td><td class="left"> Appendix B.1 of [RFC5234]: ALPHA (letters), CR (carriage return),</td><td> </td><td class="right"> Appendix B.1 of [RFC5234]: ALPHA (letters), CR (carriage return),</td><td class="lineno" valign="top"></td></tr>
859	<tr><td class="lineno" valign="top"></td><td class="left"> CRLF (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double</td><td> </td><td class="right"> CRLF (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double</td><td class="lineno" valign="top"></td></tr>
860	<tr><td class="lineno" valign="top"></td><td class="left"> quote), HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any</td><td> </td><td class="right"> quote), HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any</td><td class="lineno" valign="top"></td></tr>
861	<tr><td class="lineno" valign="top"></td><td class="left"> 8-bit sequence of data), SP (space), and VCHAR (any visible US-ASCII</td><td> </td><td class="right"> 8-bit sequence of data), SP (space), and VCHAR (any visible US-ASCII</td><td class="lineno" valign="top"></td></tr>
862	<tr><td class="lineno" valign="top"></td><td class="left"> character).</td><td> </td><td class="right"> character).</td><td class="lineno" valign="top"></td></tr>
863	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
864	<tr><td class="lineno" valign="top"></td><td class="left"> The rules below are defined in [Part1]:</td><td> </td><td class="right"> The rules below are defined in [Part1]:</td><td class="lineno" valign="top"></td></tr>
865	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
866	<tr><td class="lineno" valign="top"></td><td class="left"> OWS = <OWS, defined in [Part1], Section 3.2.1></td><td> </td><td class="right"> OWS = <OWS, defined in [Part1], Section 3.2.1></td><td class="lineno" valign="top"></td></tr>
867	<tr><td class="lineno" valign="top"></td><td class="left"> field-name = <field-name, defined in [Part1], Section 3.2></td><td> </td><td class="right"> field-name = <field-name, defined in [Part1], Section 3.2></td><td class="lineno" valign="top"></td></tr>
868	<tr><td class="lineno" valign="top"></td><td class="left"> quoted-string = <quoted-string, defined in [Part1], Section 3.2.4></td><td> </td><td class="right"> quoted-string = <quoted-string, defined in [Part1], Section 3.2.4></td><td class="lineno" valign="top"></td></tr>
869	<tr><td class="lineno" valign="top"></td><td class="left"> token = <token, defined in [Part1], Section 3.2.4></td><td> </td><td class="right"> token = <token, defined in [Part1], Section 3.2.4></td><td class="lineno" valign="top"></td></tr>
870	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
871	<tr><td><a name="diff0053" /></td></tr>
872	<tr><td class="lineno" valign="top"></td><td class="lblock"> port = <port, defined in [Part1], Section <span class="delete">2.8></span></td><td> </td><td class="rblock"> port = <port, defined in [Part1], Section <span class="insert">2.7></span></td><td class="lineno" valign="top"></td></tr>
873	<tr><td class="lineno" valign="top"></td><td class="lblock"> pseudonym = <pseudonym, defined in [Part1], Section <span class="delete">6.2></span></td><td> </td><td class="rblock"> pseudonym = <pseudonym, defined in [Part1], Section <span class="insert">5.7></span></td><td class="lineno" valign="top"></td></tr>
874	<tr><td class="lineno" valign="top"></td><td class="lblock"> uri-host = <uri-host, defined in [Part1], Section <span class="delete">2.8></span></td><td> </td><td class="rblock"> uri-host = <uri-host, defined in [Part1], Section <span class="insert">2.7></span></td><td class="lineno" valign="top"></td></tr>
875	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
876	<tr><td class="lineno" valign="top"></td><td class="left"> The rules below are defined in other parts:</td><td> </td><td class="right"> The rules below are defined in other parts:</td><td class="lineno" valign="top"></td></tr>
877	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
878	<tr><td><a name="diff0054" /></td></tr>
879	<tr><td class="lineno" valign="top"></td><td class="lblock"> HTTP-date = <HTTP-date, defined in [Part2], Section <span class="delete">5</span>.1></td><td> </td><td class="rblock"> HTTP-date = <HTTP-date, defined in [Part2], Section <span class="insert">8.1.1</span>.1></td><td class="lineno" valign="top"></td></tr>
880	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
881	<tr><td class="lineno" valign="top"></td><td class="left">Appendix C. Collected ABNF</td><td> </td><td class="right">Appendix C. Collected ABNF</td><td class="lineno" valign="top"></td></tr>
882	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
883	<tr><td class="lineno" valign="top"></td><td class="left"> Age = delta-seconds</td><td> </td><td class="right"> Age = delta-seconds</td><td class="lineno" valign="top"></td></tr>
884	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
885	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control = ( "," OWS ) cache-directive ( OWS "," [ OWS</td><td> </td><td class="right"> Cache-Control = ( "," OWS ) cache-directive ( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
886	<tr><td class="lineno" valign="top"></td><td class="left"> cache-directive ] )</td><td> </td><td class="right"> cache-directive ] )</td><td class="lineno" valign="top"></td></tr>
887	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
888	<tr><td class="lineno" valign="top"></td><td class="left"> Expires = HTTP-date</td><td> </td><td class="right"> Expires = HTTP-date</td><td class="lineno" valign="top"></td></tr>
889	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
890	<tr><td><a name="diff0055" /></td></tr>
891	<tr><td class="lineno" valign="top"></td><td class="lblock"> HTTP-date = <HTTP-date, defined in [Part2], Section <span class="delete">5</span>.1></td><td> </td><td class="rblock"> HTTP-date = <HTTP-date, defined in [Part2], Section <span class="insert">8.1.1</span>.1></td><td class="lineno" valign="top"></td></tr>
892	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
893	<tr><td class="lineno" valign="top"></td><td class="left"> OWS = <OWS, defined in [Part1], Section 3.2.1></td><td> </td><td class="right"> OWS = <OWS, defined in [Part1], Section 3.2.1></td><td class="lineno" valign="top"></td></tr>
894	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
895	<tr><td class="lineno" valign="top"></td><td class="left"> Pragma = ( "," OWS ) pragma-directive ( OWS "," [ OWS</td><td> </td><td class="right"> Pragma = ( "," OWS ) pragma-directive ( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
896	<tr><td class="lineno" valign="top"></td><td class="left"> pragma-directive ] )</td><td> </td><td class="right"> pragma-directive ] )</td><td class="lineno" valign="top"></td></tr>
897	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
898	<tr><td><a name="diff0056" /></td></tr>
899	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Vary = "" / ( ( "," OWS ) field-name *( OWS "," [ OWS field-name ]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
900	<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>
901	<tr><td class="lineno" valign="top"></td><td class="lblock"> </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
902	<tr><td class="lineno" valign="top"></td><td class="left"> Warning = ( "," OWS ) warning-value ( OWS "," [ OWS warning-value ]</td><td> </td><td class="right"> Warning = ( "," OWS ) warning-value ( OWS "," [ OWS warning-value ]</td><td class="lineno" valign="top"></td></tr>
903	<tr><td class="lineno" valign="top"></td><td class="left"> )</td><td> </td><td class="right"> )</td><td class="lineno" valign="top"></td></tr>
904	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
905	<tr><td class="lineno" valign="top"></td><td class="left"> cache-directive = token [ "=" ( token / quoted-string ) ]</td><td> </td><td class="right"> cache-directive = token [ "=" ( token / quoted-string ) ]</td><td class="lineno" valign="top"></td></tr>
906	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
907	<tr><td class="lineno" valign="top"></td><td class="left"> delta-seconds = 1DIGIT</td><td> </td><td class="right"> delta-seconds = 1DIGIT</td><td class="lineno" valign="top"></td></tr>
908	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
909	<tr><td class="lineno" valign="top"></td><td class="left"> extension-pragma = token [ "=" ( token / quoted-string ) ]</td><td> </td><td class="right"> extension-pragma = token [ "=" ( token / quoted-string ) ]</td><td class="lineno" valign="top"></td></tr>
910	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
911	<tr><td class="lineno" valign="top"></td><td class="left"> field-name = <field-name, defined in [Part1], Section 3.2></td><td> </td><td class="right"> field-name = <field-name, defined in [Part1], Section 3.2></td><td class="lineno" valign="top"></td></tr>
912	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
913	<tr><td><a name="diff0057" /></td></tr>
914	<tr><td class="lineno" valign="top"></td><td class="lblock"> port = <port, defined in [Part1], Section 2.<span class="delete">8</span>></td><td> </td><td class="rblock"> port = <port, defined in [Part1], Section 2.<span class="insert">7</span>></td><td class="lineno" valign="top"></td></tr>
915	<tr><td class="lineno" valign="top"></td><td class="left"> pragma-directive = "no-cache" / extension-pragma</td><td> </td><td class="right"> pragma-directive = "no-cache" / extension-pragma</td><td class="lineno" valign="top"></td></tr>
916	<tr><td><a name="diff0058" /></td></tr>
917	<tr><td class="lineno" valign="top"></td><td class="lblock"> pseudonym = <pseudonym, defined in [Part1], Section <span class="delete">6.2</span>></td><td> </td><td class="rblock"> pseudonym = <pseudonym, defined in [Part1], Section <span class="insert">5.7</span>></td><td class="lineno" valign="top"></td></tr>
918	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
919	<tr><td class="lineno" valign="top"></td><td class="left"> quoted-string = <quoted-string, defined in [Part1], Section 3.2.4></td><td> </td><td class="right"> quoted-string = <quoted-string, defined in [Part1], Section 3.2.4></td><td class="lineno" valign="top"></td></tr>
920	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
921	<tr><td class="lineno" valign="top"></td><td class="left"> token = <token, defined in [Part1], Section 3.2.4></td><td> </td><td class="right"> token = <token, defined in [Part1], Section 3.2.4></td><td class="lineno" valign="top"></td></tr>
922	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
923	<tr><td><a name="diff0059" /></td></tr>
924	<tr><td class="lineno" valign="top"></td><td class="lblock"> uri-host = <uri-host, defined in [Part1], Section 2.<span class="delete">8</span>></td><td> </td><td class="rblock"> uri-host = <uri-host, defined in [Part1], Section 2.<span class="insert">7</span>></td><td class="lineno" valign="top"></td></tr>
925	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
926	<tr><td class="lineno" valign="top"></td><td class="left"> warn-agent = ( uri-host [ ":" port ] ) / pseudonym</td><td> </td><td class="right"> warn-agent = ( uri-host [ ":" port ] ) / pseudonym</td><td class="lineno" valign="top"></td></tr>
927	<tr><td class="lineno" valign="top"></td><td class="left"> warn-code = 3DIGIT</td><td> </td><td class="right"> warn-code = 3DIGIT</td><td class="lineno" valign="top"></td></tr>
928	<tr><td class="lineno" valign="top"></td><td class="left"> warn-date = DQUOTE HTTP-date DQUOTE</td><td> </td><td class="right"> warn-date = DQUOTE HTTP-date DQUOTE</td><td class="lineno" valign="top"></td></tr>
929	<tr><td class="lineno" valign="top"></td><td class="left"> warn-text = quoted-string</td><td> </td><td class="right"> warn-text = quoted-string</td><td class="lineno" valign="top"></td></tr>
930	<tr><td class="lineno" valign="top"></td><td class="left"> warning-value = warn-code SP warn-agent SP warn-text [ SP warn-date</td><td> </td><td class="right"> warning-value = warn-code SP warn-agent SP warn-text [ SP warn-date</td><td class="lineno" valign="top"></td></tr>
931	<tr><td class="lineno" valign="top"></td><td class="left"> ]</td><td> </td><td class="right"> ]</td><td class="lineno" valign="top"></td></tr>
932	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
933	<tr><td class="lineno" valign="top"></td><td class="left">Appendix D. Change Log (to be removed by RFC Editor before publication)</td><td> </td><td class="right">Appendix D. Change Log (to be removed by RFC Editor before publication)</td><td class="lineno" valign="top"></td></tr>
934	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
935	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
936	<tr bgcolor="gray" ><td></td><th><a name="part-l17" /><small>skipping to change at</small><em> page 39, line 36</em></th><th> </th><th><a name="part-r17" /><small>skipping to change at</small><em> page 38, line 36</em></th><td></td></tr>
937	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
938	<tr><td class="lineno" valign="top"></td><td class="left"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/360>: "enhance</td><td> </td><td class="right"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/360>: "enhance</td><td class="lineno" valign="top"></td></tr>
939	<tr><td class="lineno" valign="top"></td><td class="left"> considerations for new cache control directives"</td><td> </td><td class="right"> considerations for new cache control directives"</td><td class="lineno" valign="top"></td></tr>
940	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
941	<tr><td class="lineno" valign="top"></td><td class="left"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/361>: "ABNF</td><td> </td><td class="right"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/361>: "ABNF</td><td class="lineno" valign="top"></td></tr>
942	<tr><td class="lineno" valign="top"></td><td class="left"> requirements for recipients"</td><td> </td><td class="right"> requirements for recipients"</td><td class="lineno" valign="top"></td></tr>
943	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
944	<tr><td class="lineno" valign="top"></td><td class="left"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/368>: "note</td><td> </td><td class="right"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/368>: "note</td><td class="lineno" valign="top"></td></tr>
945	<tr><td class="lineno" valign="top"></td><td class="left"> introduction of new IANA registries as normative changes"</td><td> </td><td class="right"> introduction of new IANA registries as normative changes"</td><td class="lineno" valign="top"></td></tr>
946	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
947	<tr><td><a name="diff0060" /></td></tr>
948	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> <span class="insert">o <http://tools.ietf.org/wg/httpbis/trac/ticket/373>: "broken prose</span></td><td class="lineno" valign="top"></td></tr>
949	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> in description of 'Vary'"</span></td><td class="lineno" valign="top"></td></tr>
950	<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>
951	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">D.2. Since draft-ietf-httpbis-p6-cache-20</span></td><td class="lineno" valign="top"></td></tr>
952	<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>
953	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Closed issues:</span></td><td class="lineno" valign="top"></td></tr>
954	<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>
955	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/375>: "'Most</span></td><td class="lineno" valign="top"></td></tr>
956	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Conservative'"</span></td><td class="lineno" valign="top"></td></tr>
957	<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>
958	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Other changes:</span></td><td class="lineno" valign="top"></td></tr>
959	<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>
960	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o Conformance criteria and considerations regarding error handling</span></td><td class="lineno" valign="top"></td></tr>
961	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> are now defined in Part 1.</span></td><td class="lineno" valign="top"></td></tr>
962	<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>
963	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o Move definition of "Vary" header field into Part 2.</span></td><td class="lineno" valign="top"></td></tr>
964	<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>
965	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o Add security considerations with respect to cache poisoning and</span></td><td class="lineno" valign="top"></td></tr>
966	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> the "Set-Cookie" header field.</span></td><td class="lineno" valign="top"></td></tr>
967	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> </td><td class="lineno" valign="top"></td></tr>
968	<tr><td class="lineno" valign="top"></td><td class="left">Index</td><td> </td><td class="right">Index</td><td class="lineno" valign="top"></td></tr>
969	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
970	<tr><td class="lineno" valign="top"></td><td class="left"> 1</td><td> </td><td class="right"> 1</td><td class="lineno" valign="top"></td></tr>
971	<tr><td><a name="diff0061" /></td></tr>
972	<tr><td class="lineno" valign="top"></td><td class="lblock"> 110 Response is Stale (warn code) <span class="delete">31</span></td><td> </td><td class="rblock"> 110 Response is Stale (warn code) <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
973	<tr><td class="lineno" valign="top"></td><td class="lblock"> 111 Revalidation Failed (warn code) <span class="delete">32</span></td><td> </td><td class="rblock"> 111 Revalidation Failed (warn code) <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
974	<tr><td class="lineno" valign="top"></td><td class="lblock"> 112 Disconnected Operation (warn code) <span class="delete">32</span></td><td> </td><td class="rblock"> 112 Disconnected Operation (warn code) <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
975	<tr><td class="lineno" valign="top"></td><td class="lblock"> 113 Heuristic Expiration (warn code) <span class="delete">32</span></td><td> </td><td class="rblock"> 113 Heuristic Expiration (warn code) <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
976	<tr><td class="lineno" valign="top"></td><td class="lblock"> 199 Miscellaneous Warning (warn code) <span class="delete">32</span></td><td> </td><td class="rblock"> 199 Miscellaneous Warning (warn code) <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
977	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
978	<tr><td class="lineno" valign="top"></td><td class="left"> 2</td><td> </td><td class="right"> 2</td><td class="lineno" valign="top"></td></tr>
979	<tr><td><a name="diff0062" /></td></tr>
980	<tr><td class="lineno" valign="top"></td><td class="lblock"> 214 Transformation Applied (warn code) <span class="delete">32</span></td><td> </td><td class="rblock"> 214 Transformation Applied (warn code) <span class="insert">30</span></td><td class="lineno" valign="top"></td></tr>
981	<tr><td class="lineno" valign="top"></td><td class="lblock"> 299 Miscellaneous Persistent Warning (warn code) <span class="delete">32</span></td><td> </td><td class="rblock"> 299 Miscellaneous Persistent Warning (warn code) <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
982	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
983	<tr><td class="lineno" valign="top"></td><td class="left"> A</td><td> </td><td class="right"> A</td><td class="lineno" valign="top"></td></tr>
984	<tr><td class="lineno" valign="top"></td><td class="left"> age 5</td><td> </td><td class="right"> age 5</td><td class="lineno" valign="top"></td></tr>
985	<tr><td><a name="diff0063" /></td></tr>
986	<tr><td class="lineno" valign="top"></td><td class="lblock"> Age header field <span class="delete">20</span></td><td> </td><td class="rblock"> Age header field <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
987	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
988	<tr><td class="lineno" valign="top"></td><td class="left"> C</td><td> </td><td class="right"> C</td><td class="lineno" valign="top"></td></tr>
989	<tr><td class="lineno" valign="top"></td><td class="left"> cache 4</td><td> </td><td class="right"> cache 4</td><td class="lineno" valign="top"></td></tr>
990	<tr><td><a name="diff0064" /></td></tr>
991	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directives</span></td><td> </td><td class="rblock"> cache entry <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
992	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> max-age 22, 25</span></td><td> </td><td class="rblock"> cache key <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
993	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> max-stale 22</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
994	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> min-fresh 22</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
995	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> must-revalidate 25</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
996	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> no-cache 21, 24</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
997	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> no-store 21, 25</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
998	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> no-transform 23, 26</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
999	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> only-if-cached 23</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1000	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> private 23</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1001	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> proxy-revalidate 25</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1002	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> public 23</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1003	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> s-maxage 26</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1004	<tr><td class="lineno" valign="top"></td><td class="lblock"> cache entry <span class="delete">7</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1005	<tr><td class="lineno" valign="top"></td><td class="lblock"> cache key <span class="delete">7</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1006	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control header field 20</td><td> </td><td class="right"> Cache-Control header field 20</td><td class="lineno" valign="top"></td></tr>
1007	<tr><td class="lineno" valign="top"></td><td class="left"> cacheable 4</td><td> </td><td class="right"> cacheable 4</td><td class="lineno" valign="top"></td></tr>
1008	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1009	<tr><td class="lineno" valign="top"></td><td class="left"> E</td><td> </td><td class="right"> E</td><td class="lineno" valign="top"></td></tr>
1010	<tr><td><a name="diff0065" /></td></tr>
1011	<tr><td class="lineno" valign="top"></td><td class="lblock"> Expires header field 2<span class="delete">8</span></td><td> </td><td class="rblock"> Expires header field 2<span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
1012	<tr><td class="lineno" valign="top"></td><td class="left"> explicit expiration time 5</td><td> </td><td class="right"> explicit expiration time 5</td><td class="lineno" valign="top"></td></tr>
1013	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1014	<tr><td class="lineno" valign="top"></td><td class="left"> F</td><td> </td><td class="right"> F</td><td class="lineno" valign="top"></td></tr>
1015	<tr><td class="lineno" valign="top"></td><td class="left"> first-hand 5</td><td> </td><td class="right"> first-hand 5</td><td class="lineno" valign="top"></td></tr>
1016	<tr><td class="lineno" valign="top"></td><td class="left"> fresh 5</td><td> </td><td class="right"> fresh 5</td><td class="lineno" valign="top"></td></tr>
1017	<tr><td class="lineno" valign="top"></td><td class="left"> freshness lifetime 5</td><td> </td><td class="right"> freshness lifetime 5</td><td class="lineno" valign="top"></td></tr>
1018	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1019	<tr><td class="lineno" valign="top"></td><td class="left"> G</td><td> </td><td class="right"> G</td><td class="lineno" valign="top"></td></tr>
1020	<tr><td class="lineno" valign="top"></td><td class="left"> Grammar</td><td> </td><td class="right"> Grammar</td><td class="lineno" valign="top"></td></tr>
1021	<tr><td><a name="diff0066" /></td></tr>
1022	<tr><td class="lineno" valign="top"></td><td class="lblock"> Age <span class="delete">20</span></td><td> </td><td class="rblock"> Age <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
1023	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Cache-Control 21</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1024	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> cache-directive 21</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1025	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> delta-seconds 7</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1026	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Expires 28</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1027	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> extension-pragma 29</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1028	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Pragma 29</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1029	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> pragma-directive 29</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1030	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Vary 29</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1031	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> warn-agent 30</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1032	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> warn-code 30</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1033	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> warn-date 30</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1034	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> warn-text 30</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1035	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Warning 30</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1036	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> warning-value 30</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1037	<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>
1038	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> H</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1039	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Header Fields</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1040	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Age 20</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1041	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control 20</td><td> </td><td class="right"> Cache-Control 20</td><td class="lineno" valign="top"></td></tr>
1042	<tr><td><a name="diff0067" /></td></tr>
1043	<tr><td class="lineno" valign="top"></td><td class="lblock"> Expires 28</td><td> </td><td class="rblock"> <span class="insert">cache-directive 20</span></td><td class="lineno" valign="top"></td></tr>
1044	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> delta-seconds 6</span></td><td class="lineno" valign="top"></td></tr>
1045	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> Expires <span class="insert">27</span></td><td class="lineno" valign="top"></td></tr>
1046	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> extension-pragma</span> 28</td><td class="lineno" valign="top"></td></tr>
1047	<tr><td class="lineno" valign="top"></td><td class="left"> Pragma 28</td><td> </td><td class="right"> Pragma 28</td><td class="lineno" valign="top"></td></tr>
1048	<tr><td><a name="diff0068" /></td></tr>
1049	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Vary</span> 29</td><td> </td><td class="rblock"> <span class="insert">pragma-directive 28</span></td><td class="lineno" valign="top"></td></tr>
1050	<tr><td class="lineno" valign="top"></td><td class="lblock"> Warning <span class="delete">30</span></td><td> </td><td class="rblock"><span class="insert"> warn-agent 29</span></td><td class="lineno" valign="top"></td></tr>
1051	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> warn-code 29</span></td><td class="lineno" valign="top"></td></tr>
1052	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> warn-date 29</span></td><td class="lineno" valign="top"></td></tr>
1053	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> warn-text</span> 29</td><td class="lineno" valign="top"></td></tr>
1054	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> Warning <span class="insert">29</span></td><td class="lineno" valign="top"></td></tr>
1055	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> warning-value 29</span></td><td class="lineno" valign="top"></td></tr>
1056	<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>
1057	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> H</span></td><td class="lineno" valign="top"></td></tr>
1058	<tr><td class="lineno" valign="top"></td><td class="left"> heuristic expiration time 5</td><td> </td><td class="right"> heuristic expiration time 5</td><td class="lineno" valign="top"></td></tr>
1059	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1060	<tr><td class="lineno" valign="top"></td><td class="left"> M</td><td> </td><td class="right"> M</td><td class="lineno" valign="top"></td></tr>
1061	<tr><td><a name="diff0069" /></td></tr>
1062	<tr><td class="lineno" valign="top"></td><td class="lblock"> max-age</td><td> </td><td class="rblock"> max-age <span class="insert">(cache directive) 21,</span> 25</td><td class="lineno" valign="top"></td></tr>
1063	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 22,</span> 25</td><td> </td><td class="rblock"> max-stale <span class="insert">(cache directive) 21</span></td><td class="lineno" valign="top"></td></tr>
1064	<tr><td class="lineno" valign="top"></td><td class="lblock"> max-stale</td><td> </td><td class="rblock"> min-fresh <span class="insert">(cache directive)</span> 22</td><td class="lineno" valign="top"></td></tr>
1065	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 22</span></td><td> </td><td class="rblock"> must-revalidate <span class="insert">(cache directive) 24</span></td><td class="lineno" valign="top"></td></tr>
1066	<tr><td class="lineno" valign="top"></td><td class="lblock"> min-fresh</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1067	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive</span> 22</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1068	<tr><td class="lineno" valign="top"></td><td class="lblock"> must-revalidate</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1069	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 25</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1070	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1071	<tr><td class="lineno" valign="top"></td><td class="left"> N</td><td> </td><td class="right"> N</td><td class="lineno" valign="top"></td></tr>
1072	<tr><td><a name="diff0070" /></td></tr>
1073	<tr><td class="lineno" valign="top"></td><td class="lblock"> no-cache</td><td> </td><td class="rblock"> no-cache <span class="insert">(cache directive) 20, 23</span></td><td class="lineno" valign="top"></td></tr>
1074	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 21, 24</span></td><td> </td><td class="rblock"> no-store <span class="insert">(cache directive) 20, 24</span></td><td class="lineno" valign="top"></td></tr>
1075	<tr><td class="lineno" valign="top"></td><td class="lblock"> no-store</td><td> </td><td class="rblock"> no-transform <span class="insert">(cache directive) 22, 25</span></td><td class="lineno" valign="top"></td></tr>
1076	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 21, 25</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1077	<tr><td class="lineno" valign="top"></td><td class="lblock"> no-transform</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1078	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 23, 26</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1079	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1080	<tr><td class="lineno" valign="top"></td><td class="left"> O</td><td> </td><td class="right"> O</td><td class="lineno" valign="top"></td></tr>
1081	<tr><td><a name="diff0071" /></td></tr>
1082	<tr><td class="lineno" valign="top"></td><td class="lblock"> only-if-cached</td><td> </td><td class="rblock"> only-if-cached <span class="insert">(cache directive) 22</span></td><td class="lineno" valign="top"></td></tr>
1083	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 23</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1084	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1085	<tr><td class="lineno" valign="top"></td><td class="left"> P</td><td> </td><td class="right"> P</td><td class="lineno" valign="top"></td></tr>
1086	<tr><td class="lineno" valign="top"></td><td class="left"> Pragma header field 28</td><td> </td><td class="right"> Pragma header field 28</td><td class="lineno" valign="top"></td></tr>
1087	<tr><td><a name="diff0072" /></td></tr>
1088	<tr><td class="lineno" valign="top"></td><td class="lblock"> private</td><td> </td><td class="rblock"> private <span class="insert">(cache directive) 22</span></td><td class="lineno" valign="top"></td></tr>
1089	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 23</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1090	<tr><td class="lineno" valign="top"></td><td class="left"> private cache 4</td><td> </td><td class="right"> private cache 4</td><td class="lineno" valign="top"></td></tr>
1091	<tr><td><a name="diff0073" /></td></tr>
1092	<tr><td class="lineno" valign="top"></td><td class="lblock"> proxy-revalidate</td><td> </td><td class="rblock"> proxy-revalidate <span class="insert">(cache directive) 24</span></td><td class="lineno" valign="top"></td></tr>
1093	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 25</span></td><td> </td><td class="rblock"> public <span class="insert">(cache directive) 22</span></td><td class="lineno" valign="top"></td></tr>
1094	<tr><td class="lineno" valign="top"></td><td class="lblock"> public</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1095	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 23</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1096	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1097	<tr><td class="lineno" valign="top"></td><td class="left"> S</td><td> </td><td class="right"> S</td><td class="lineno" valign="top"></td></tr>
1098	<tr><td><a name="diff0074" /></td></tr>
1099	<tr><td class="lineno" valign="top"></td><td class="lblock"> s-maxage</td><td> </td><td class="rblock"> s-maxage <span class="insert">(cache directive) 25</span></td><td class="lineno" valign="top"></td></tr>
1100	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Cache Directive 26</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1101	<tr><td class="lineno" valign="top"></td><td class="left"> shared cache 4</td><td> </td><td class="right"> shared cache 4</td><td class="lineno" valign="top"></td></tr>
1102	<tr><td class="lineno" valign="top"></td><td class="left"> stale 5</td><td> </td><td class="right"> stale 5</td><td class="lineno" valign="top"></td></tr>
1103	<tr><td class="lineno" valign="top"></td><td class="left"> strong validator 6</td><td> </td><td class="right"> strong validator 6</td><td class="lineno" valign="top"></td></tr>
1104	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1105	<tr><td class="lineno" valign="top"></td><td class="left"> V</td><td> </td><td class="right"> V</td><td class="lineno" valign="top"></td></tr>
1106	<tr><td class="lineno" valign="top"></td><td class="left"> validator 5</td><td> </td><td class="right"> validator 5</td><td class="lineno" valign="top"></td></tr>
1107	<tr><td class="lineno" valign="top"></td><td class="left"> strong 6</td><td> </td><td class="right"> strong 6</td><td class="lineno" valign="top"></td></tr>
1108	<tr><td><a name="diff0075" /></td></tr>
1109	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Vary header field 29</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1110	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1111	<tr><td class="lineno" valign="top"></td><td class="left"> W</td><td> </td><td class="right"> W</td><td class="lineno" valign="top"></td></tr>
1112	<tr><td><a name="diff0076" /></td></tr>
1113	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Warn Codes</span></td><td> </td><td class="rblock"> Warning header field <span class="insert">28</span></td><td class="lineno" valign="top"></td></tr>
1114	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 110 Response is Stale 31</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1115	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 111 Revalidation Failed 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1116	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 112 Disconnected Operation 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1117	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 113 Heuristic Expiration 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1118	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 199 Miscellaneous Warning 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1119	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 214 Transformation Applied 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1120	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 299 Miscellaneous Persistent Warning 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1121	<tr><td class="lineno" valign="top"></td><td class="lblock"> Warning header field <span class="delete">30</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1122	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1123	<tr><td class="lineno" valign="top"></td><td class="left">Authors' Addresses</td><td> </td><td class="right">Authors' Addresses</td><td class="lineno" valign="top"></td></tr>
1124	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1125	<tr><td class="lineno" valign="top"></td><td class="left"> Roy T. Fielding (editor)</td><td> </td><td class="right"> Roy T. Fielding (editor)</td><td class="lineno" valign="top"></td></tr>
1126	<tr><td class="lineno" valign="top"></td><td class="left"> Adobe Systems Incorporated</td><td> </td><td class="right"> Adobe Systems Incorporated</td><td class="lineno" valign="top"></td></tr>
1127	<tr><td class="lineno" valign="top"></td><td class="left"> 345 Park Ave</td><td> </td><td class="right"> 345 Park Ave</td><td class="lineno" valign="top"></td></tr>
1128	<tr><td class="lineno" valign="top"></td><td class="left"> San Jose, CA 95110</td><td> </td><td class="right"> San Jose, CA 95110</td><td class="lineno" valign="top"></td></tr>
1129	<tr><td class="lineno" valign="top"></td><td class="left"> USA</td><td> </td><td class="right"> USA</td><td class="lineno" valign="top"></td></tr>
1130	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1131	<tr><td class="lineno" valign="top"></td><td class="left"> EMail: fielding@gbiv.com</td><td> </td><td class="right"> EMail: fielding@gbiv.com</td><td class="lineno" valign="top"></td></tr>
1132	<tr><td class="lineno" valign="top"></td><td class="left"> URI: http://roy.gbiv.com/</td><td> </td><td class="right"> URI: http://roy.gbiv.com/</td><td class="lineno" valign="top"></td></tr>
1133	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1134	<tr><td><a name="diff0077" /></td></tr>
1135	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Yves Lafon (editor)</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1136	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> World Wide Web Consortium</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1137	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> W3C / ERCIM</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1138	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 2004, rte des Lucioles</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1139	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Sophia-Antipolis, AM 06902</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1140	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> France</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1141	<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>
1142	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> EMail: ylafon@w3.org</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1143	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> URI: http://www.raubacapeu.net/people/yves/</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1144	<tr><td class="lineno" valign="top"></td><td class="lblock"> </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
1145	<tr><td class="lineno" valign="top"></td><td class="left"> Mark Nottingham (editor)</td><td> </td><td class="right"> Mark Nottingham (editor)</td><td class="lineno" valign="top"></td></tr>
1146	<tr><td><a name="diff0078" /></td></tr>
1147	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Rackspace</span></td><td> </td><td class="rblock"> <span class="insert">Akamai</span></td><td class="lineno" valign="top"></td></tr>
1148	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1149	<tr><td class="lineno" valign="top"></td><td class="left"> EMail: mnot@mnot.net</td><td> </td><td class="right"> EMail: mnot@mnot.net</td><td class="lineno" valign="top"></td></tr>
1150	<tr><td class="lineno" valign="top"></td><td class="left"> URI: http://www.mnot.net/</td><td> </td><td class="right"> URI: http://www.mnot.net/</td><td class="lineno" valign="top"></td></tr>
1151	<tr><td><a name="diff0079" /></td></tr>
1152	<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>
1153	<tr><td class="lineno" valign="top"></td><td class="left"> Julian F. Reschke (editor)</td><td> </td><td class="right"> Julian F. Reschke (editor)</td><td class="lineno" valign="top"></td></tr>
1154	<tr><td class="lineno" valign="top"></td><td class="left"> greenbytes GmbH</td><td> </td><td class="right"> greenbytes GmbH</td><td class="lineno" valign="top"></td></tr>
1155	<tr><td class="lineno" valign="top"></td><td class="left"> Hafenweg 16</td><td> </td><td class="right"> Hafenweg 16</td><td class="lineno" valign="top"></td></tr>
1156	<tr><td class="lineno" valign="top"></td><td class="left"> Muenster, NW 48155</td><td> </td><td class="right"> Muenster, NW 48155</td><td class="lineno" valign="top"></td></tr>
1157	<tr><td class="lineno" valign="top"></td><td class="left"> Germany</td><td> </td><td class="right"> Germany</td><td class="lineno" valign="top"></td></tr>
1158	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1159	<tr><td class="lineno" valign="top"></td><td class="left"> EMail: julian.reschke@greenbytes.de</td><td> </td><td class="right"> EMail: julian.reschke@greenbytes.de</td><td class="lineno" valign="top"></td></tr>
1160	<tr><td class="lineno" valign="top"></td><td class="left"> URI: http://greenbytes.de/tech/webdav/</td><td> </td><td class="right"> URI: http://greenbytes.de/tech/webdav/</td><td class="lineno" valign="top"></td></tr>
1161
1162	<tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
1163	<tr bgcolor="gray"><th colspan="5" align="center"><a name="end"> End of changes. 79 change blocks. </a></th></tr>
1164	<tr class="stats"><td></td><th><i>304 lines changed or deleted</i></th><th><i> </i></th><th><i>215 lines changed or added</i></th><td></td></tr>
1165	<tr><td colspan="5" align="center" class="small"><br/>This html diff was produced by rfcdiff 1.38. The latest version is available from <a href="http://www.tools.ietf.org/tools/rfcdiff/" >http://tools.ietf.org/tools/rfcdiff/</a> </td></tr>
1166	</table>
1167	</body>
1168	</html>

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