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38	<tr bgcolor="orange"><th></th><th> draft-ietf-httpbis-p6-cache-10.txt </th><th> </th><th> draft-ietf-httpbis-p6-cache-11.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 Day Software</td><td> </td><td class="right">Internet-Draft Day Software</td><td class="lineno" valign="top"></td></tr>
42	<tr><td class="lineno" valign="top"></td><td class="left">Obsoletes: 2616 (if approved) J. Gettys</td><td> </td><td class="right">Obsoletes: 2616 (if approved) J. Gettys</td><td class="lineno" valign="top"></td></tr>
43	<tr><td class="lineno" valign="top"></td><td class="left">Intended status: Standards Track Alcatel-Lucent</td><td> </td><td class="right">Intended status: Standards Track Alcatel-Lucent</td><td class="lineno" valign="top"></td></tr>
44	<tr><td><a name="diff0001" /></td></tr>
45	<tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">January 13</span>, 2011 J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">February 5</span>, 2011 J. Mogul</td><td class="lineno" valign="top"></td></tr>
46	<tr><td class="lineno" valign="top"></td><td class="left"> HP</td><td> </td><td class="right"> HP</td><td class="lineno" valign="top"></td></tr>
47	<tr><td class="lineno" valign="top"></td><td class="left"> H. Frystyk</td><td> </td><td class="right"> H. Frystyk</td><td class="lineno" valign="top"></td></tr>
48	<tr><td class="lineno" valign="top"></td><td class="left"> Microsoft</td><td> </td><td class="right"> Microsoft</td><td class="lineno" valign="top"></td></tr>
49	<tr><td class="lineno" valign="top"></td><td class="left"> L. Masinter</td><td> </td><td class="right"> L. Masinter</td><td class="lineno" valign="top"></td></tr>
50	<tr><td class="lineno" valign="top"></td><td class="left"> Adobe Systems</td><td> </td><td class="right"> Adobe Systems</td><td class="lineno" valign="top"></td></tr>
51	<tr><td class="lineno" valign="top"></td><td class="left"> P. Leach</td><td> </td><td class="right"> P. Leach</td><td class="lineno" valign="top"></td></tr>
52	<tr><td class="lineno" valign="top"></td><td class="left"> Microsoft</td><td> </td><td class="right"> Microsoft</td><td class="lineno" valign="top"></td></tr>
53	<tr><td class="lineno" valign="top"></td><td class="left"> T. Berners-Lee</td><td> </td><td class="right"> T. Berners-Lee</td><td class="lineno" valign="top"></td></tr>
54	<tr><td class="lineno" valign="top"></td><td class="left"> W3C/MIT</td><td> </td><td class="right"> W3C/MIT</td><td class="lineno" valign="top"></td></tr>
55	<tr><td class="lineno" valign="top"></td><td class="left"> Y. Lafon, Ed.</td><td> </td><td class="right"> Y. Lafon, Ed.</td><td class="lineno" valign="top"></td></tr>
56	<tr><td class="lineno" valign="top"></td><td class="left"> W3C</td><td> </td><td class="right"> W3C</td><td class="lineno" valign="top"></td></tr>
57	<tr><td class="lineno" valign="top"></td><td class="left"> M. Nottingham, Ed.</td><td> </td><td class="right"> M. Nottingham, Ed.</td><td class="lineno" valign="top"></td></tr>
58	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
59	<tr><td class="lineno" valign="top"></td><td class="left"> J. Reschke, Ed.</td><td> </td><td class="right"> J. Reschke, Ed.</td><td class="lineno" valign="top"></td></tr>
60	<tr><td class="lineno" valign="top"></td><td class="left"> greenbytes</td><td> </td><td class="right"> greenbytes</td><td class="lineno" valign="top"></td></tr>
61	<tr><td><a name="diff0002" /></td></tr>
62	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete"> July 12</span>, 2010</td><td> </td><td class="rblock"> <span class="insert">August 4</span>, 2010</td><td class="lineno" valign="top"></td></tr>
63	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
64	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP/1.1, part 6: Caching</td><td> </td><td class="right"> HTTP/1.1, part 6: Caching</td><td class="lineno" valign="top"></td></tr>
65	<tr><td><a name="diff0003" /></td></tr>
66	<tr><td class="lineno" valign="top"></td><td class="lblock"> draft-ietf-httpbis-p6-cache-1<span class="delete">0</span></td><td> </td><td class="rblock"> draft-ietf-httpbis-p6-cache-1<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
67	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
68	<tr><td class="lineno" valign="top"></td><td class="left">Abstract</td><td> </td><td class="right">Abstract</td><td class="lineno" valign="top"></td></tr>
69	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
70	<tr><td class="lineno" valign="top"></td><td class="left"> The Hypertext Transfer Protocol (HTTP) is an application-level</td><td> </td><td class="right"> The Hypertext Transfer Protocol (HTTP) is an application-level</td><td class="lineno" valign="top"></td></tr>
71	<tr><td class="lineno" valign="top"></td><td class="left"> protocol for distributed, collaborative, hypermedia information</td><td> </td><td class="right"> protocol for distributed, collaborative, hypermedia information</td><td class="lineno" valign="top"></td></tr>
72	<tr><td class="lineno" valign="top"></td><td class="left"> systems. This document is Part 6 of the seven-part specification</td><td> </td><td class="right"> systems. This document is Part 6 of the seven-part specification</td><td class="lineno" valign="top"></td></tr>
73	<tr><td class="lineno" valign="top"></td><td class="left"> that defines the protocol referred to as "HTTP/1.1" and, taken</td><td> </td><td class="right"> that defines the protocol referred to as "HTTP/1.1" and, taken</td><td class="lineno" valign="top"></td></tr>
74	<tr><td class="lineno" valign="top"></td><td class="left"> together, obsoletes RFC 2616. Part 6 defines requirements on HTTP</td><td> </td><td class="right"> together, obsoletes RFC 2616. Part 6 defines requirements on HTTP</td><td class="lineno" valign="top"></td></tr>
75	<tr><td class="lineno" valign="top"></td><td class="left"> caches and the associated header fields that control cache behavior</td><td> </td><td class="right"> caches and the associated header fields that control cache behavior</td><td class="lineno" valign="top"></td></tr>
76	<tr><td class="lineno" valign="top"></td><td class="left"> or indicate cacheable response messages.</td><td> </td><td class="right"> or indicate cacheable response messages.</td><td class="lineno" valign="top"></td></tr>
77	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
78	<tr><td class="lineno" valign="top"></td><td class="left">Editorial Note (To be removed by RFC Editor)</td><td> </td><td class="right">Editorial Note (To be removed by RFC Editor)</td><td class="lineno" valign="top"></td></tr>
79	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
80	<tr><td class="lineno" valign="top"></td><td class="left"> Discussion of this draft should take place on the HTTPBIS working</td><td> </td><td class="right"> Discussion of this draft should take place on the HTTPBIS working</td><td class="lineno" valign="top"></td></tr>
81	<tr><td class="lineno" valign="top"></td><td class="left"> group mailing list (ietf-http-wg@w3.org). The current issues list is</td><td> </td><td class="right"> group mailing list (ietf-http-wg@w3.org). The current issues list is</td><td class="lineno" valign="top"></td></tr>
82	<tr><td class="lineno" valign="top"></td><td class="left"> at <http://tools.ietf.org/wg/httpbis/trac/report/3> and related</td><td> </td><td class="right"> at <http://tools.ietf.org/wg/httpbis/trac/report/3> and related</td><td class="lineno" valign="top"></td></tr>
83	<tr><td class="lineno" valign="top"></td><td class="left"> documents (including fancy diffs) can be found at</td><td> </td><td class="right"> documents (including fancy diffs) can be found at</td><td class="lineno" valign="top"></td></tr>
84	<tr><td class="lineno" valign="top"></td><td class="left"> <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>
85	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
86	<tr><td><a name="diff0004" /></td></tr>
87	<tr><td class="lineno" valign="top"></td><td class="lblock"> The changes in this draft are summarized in Appendix C.1<span class="delete">1</span>.</td><td> </td><td class="rblock"> The changes in this draft are summarized in Appendix C.1<span class="insert">2</span>.</td><td class="lineno" valign="top"></td></tr>
88	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
89	<tr><td class="lineno" valign="top"></td><td class="left">Status of This Memo</td><td> </td><td class="right">Status of This Memo</td><td class="lineno" valign="top"></td></tr>
90	<tr><td class="lineno" valign="top"></td><td class="left"> This Internet-Draft is submitted in full conformance with the</td><td> </td><td class="right"> This Internet-Draft is submitted in full conformance with the</td><td class="lineno" valign="top"></td></tr>
91	<tr><td class="lineno" valign="top"></td><td class="left"> provisions of BCP 78 and BCP 79.</td><td> </td><td class="right"> provisions of BCP 78 and BCP 79.</td><td class="lineno" valign="top"></td></tr>
92	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
93	<tr><td class="lineno" valign="top"></td><td class="left"> Internet-Drafts are working documents of the Internet Engineering</td><td> </td><td class="right"> Internet-Drafts are working documents of the Internet Engineering</td><td class="lineno" valign="top"></td></tr>
94	<tr><td class="lineno" valign="top"></td><td class="left"> Task Force (IETF). Note that other groups may also distribute</td><td> </td><td class="right"> Task Force (IETF). Note that other groups may also distribute</td><td class="lineno" valign="top"></td></tr>
95	<tr><td class="lineno" valign="top"></td><td class="left"> working documents as Internet-Drafts. The list of current Internet-</td><td> </td><td class="right"> working documents as Internet-Drafts. The list of current Internet-</td><td class="lineno" valign="top"></td></tr>
96	<tr><td class="lineno" valign="top"></td><td class="left"> Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td> </td><td class="right"> Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td class="lineno" valign="top"></td></tr>
97	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
98	<tr><td class="lineno" valign="top"></td><td class="left"> Internet-Drafts are draft documents valid for a maximum of six months</td><td> </td><td class="right"> Internet-Drafts are draft documents valid for a maximum of six months</td><td class="lineno" valign="top"></td></tr>
99	<tr><td class="lineno" valign="top"></td><td class="left"> and may be updated, replaced, or obsoleted by other documents at any</td><td> </td><td class="right"> and may be updated, replaced, or obsoleted by other documents at any</td><td class="lineno" valign="top"></td></tr>
100	<tr><td class="lineno" valign="top"></td><td class="left"> time. It is inappropriate to use Internet-Drafts as reference</td><td> </td><td class="right"> time. It is inappropriate to use Internet-Drafts as reference</td><td class="lineno" valign="top"></td></tr>
101	<tr><td class="lineno" valign="top"></td><td class="left"> material or to cite them other than as "work in progress."</td><td> </td><td class="right"> material or to cite them other than as "work in progress."</td><td class="lineno" valign="top"></td></tr>
102	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
103	<tr><td><a name="diff0005" /></td></tr>
104	<tr><td class="lineno" valign="top"></td><td class="lblock"> This Internet-Draft will expire on <span class="delete">January 13</span>, 2011.</td><td> </td><td class="rblock"> This Internet-Draft will expire on <span class="insert">February 5</span>, 2011.</td><td class="lineno" valign="top"></td></tr>
105	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
106	<tr><td class="lineno" valign="top"></td><td class="left">Copyright Notice</td><td> </td><td class="right">Copyright Notice</td><td class="lineno" valign="top"></td></tr>
107	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
108	<tr><td class="lineno" valign="top"></td><td class="left"> Copyright (c) 2010 IETF Trust and the persons identified as the</td><td> </td><td class="right"> Copyright (c) 2010 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
109	<tr><td class="lineno" valign="top"></td><td class="left"> document authors. All rights reserved.</td><td> </td><td class="right"> document authors. All rights reserved.</td><td class="lineno" valign="top"></td></tr>
110	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
111	<tr><td class="lineno" valign="top"></td><td class="left"> This document is subject to BCP 78 and the IETF Trust's Legal</td><td> </td><td class="right"> This document is subject to BCP 78 and the IETF Trust's Legal</td><td class="lineno" valign="top"></td></tr>
112	<tr><td class="lineno" valign="top"></td><td class="left"> Provisions Relating to IETF Documents</td><td> </td><td class="right"> Provisions Relating to IETF Documents</td><td class="lineno" valign="top"></td></tr>
113	<tr><td class="lineno" valign="top"></td><td class="left"> (http://trustee.ietf.org/license-info) in effect on the date of</td><td> </td><td class="right"> (http://trustee.ietf.org/license-info) in effect on the date of</td><td class="lineno" valign="top"></td></tr>
114	<tr><td class="lineno" valign="top"></td><td class="left"> publication of this document. Please review these documents</td><td> </td><td class="right"> publication of this document. Please review these documents</td><td class="lineno" valign="top"></td></tr>
115	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
116	<tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 3, line 24</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 3, line 24</em></th><td></td></tr>
117	<tr><td class="lineno" valign="top"></td><td class="left"> 2.3.2. Calculating Age . . . . . . . . . . . . . . . . . . . 12</td><td> </td><td class="right"> 2.3.2. Calculating Age . . . . . . . . . . . . . . . . . . . 12</td><td class="lineno" valign="top"></td></tr>
118	<tr><td class="lineno" valign="top"></td><td class="left"> 2.3.3. Serving Stale Responses . . . . . . . . . . . . . . . 13</td><td> </td><td class="right"> 2.3.3. Serving Stale Responses . . . . . . . . . . . . . . . 13</td><td class="lineno" valign="top"></td></tr>
119	<tr><td class="lineno" valign="top"></td><td class="left"> 2.4. Validation Model . . . . . . . . . . . . . . . . . . . . . 14</td><td> </td><td class="right"> 2.4. Validation Model . . . . . . . . . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
120	<tr><td class="lineno" valign="top"></td><td class="left"> 2.5. Request Methods that Invalidate . . . . . . . . . . . . . 14</td><td> </td><td class="right"> 2.5. Request Methods that Invalidate . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
121	<tr><td class="lineno" valign="top"></td><td class="left"> 2.6. Shared Caching of Authenticated Responses . . . . . . . . 15</td><td> </td><td class="right"> 2.6. Shared Caching of Authenticated Responses . . . . . . . . 15</td><td class="lineno" valign="top"></td></tr>
122	<tr><td class="lineno" valign="top"></td><td class="left"> 2.7. Caching Negotiated Responses . . . . . . . . . . . . . . . 16</td><td> </td><td class="right"> 2.7. Caching Negotiated Responses . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
123	<tr><td class="lineno" valign="top"></td><td class="left"> 2.8. Combining Responses . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="right"> 2.8. Combining Responses . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
124	<tr><td class="lineno" valign="top"></td><td class="left"> 3. Header Field Definitions . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right"> 3. Header Field Definitions . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
125	<tr><td class="lineno" valign="top"></td><td class="left"> 3.1. Age . . . . . . . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right"> 3.1. Age . . . . . . . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
126	<tr><td class="lineno" valign="top"></td><td class="left"> 3.2. Cache-Control . . . . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right"> 3.2. Cache-Control . . . . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
127	<tr><td><a name="diff0006" /></td></tr>
128	<tr><td class="lineno" valign="top"></td><td class="lblock"> 3.2.1. Request Cache-Control Directives . . . . . . . . . . . 1<span class="delete">9</span></td><td> </td><td class="rblock"> 3.2.1. Request Cache-Control Directives . . . . . . . . . . . 1<span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
129	<tr><td class="lineno" valign="top"></td><td class="left"> 3.2.2. Response Cache-Control Directives . . . . . . . . . . 20</td><td> </td><td class="right"> 3.2.2. Response Cache-Control Directives . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
130	<tr><td><a name="diff0007" /></td></tr>
131	<tr><td class="lineno" valign="top"></td><td class="lblock"> 3.2.3. Cache Control Extensions . . . . . . . . . . . . . . . 2<span class="delete">3</span></td><td> </td><td class="rblock"> 3.2.3. Cache Control Extensions . . . . . . . . . . . . . . . 2<span class="insert">2</span></td><td class="lineno" valign="top"></td></tr>
132	<tr><td class="lineno" valign="top"></td><td class="left"> 3.3. Expires . . . . . . . . . . . . . . . . . . . . . . . . . 24</td><td> </td><td class="right"> 3.3. Expires . . . . . . . . . . . . . . . . . . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
133	<tr><td><a name="diff0008" /></td></tr>
134	<tr><td class="lineno" valign="top"></td><td class="lblock"> 3.4. Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 2<span class="delete">5</span></td><td> </td><td class="rblock"> 3.4. Pragma . . . . . . . . . . . . . . . . . . . . . . . . . . 2<span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
135	<tr><td class="lineno" valign="top"></td><td class="left"> 3.5. Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td> </td><td class="right"> 3.5. Vary . . . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td class="lineno" valign="top"></td></tr>
136	<tr><td class="lineno" valign="top"></td><td class="left"> 3.6. Warning . . . . . . . . . . . . . . . . . . . . . . . . . 26</td><td> </td><td class="right"> 3.6. Warning . . . . . . . . . . . . . . . . . . . . . . . . . 26</td><td class="lineno" valign="top"></td></tr>
137	<tr><td><a name="diff0009" /></td></tr>
138	<tr><td class="lineno" valign="top"></td><td class="lblock"> 4. History Lists . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">29</span></td><td> </td><td class="rblock"> 4. History Lists . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">28</span></td><td class="lineno" valign="top"></td></tr>
139	<tr><td class="lineno" valign="top"></td><td class="lblock"> 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . <span class="delete">29</span></td><td> </td><td class="rblock"> 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . <span class="insert">28</span></td><td class="lineno" valign="top"></td></tr>
140	<tr><td class="lineno" valign="top"></td><td class="lblock"> 5.1. Cache Directive Registry . . . . . . . . . . . . . . . . . <span class="delete">29</span></td><td> </td><td class="rblock"> 5.1. Cache Directive Registry . . . . . . . . . . . . . . . . . <span class="insert">28</span></td><td class="lineno" valign="top"></td></tr>
141	<tr><td class="lineno" valign="top"></td><td class="lblock"> 5.2. <span class="delete">Message</span> Header Registration . . . . . . . . . . . . . . . <span class="delete">30</span></td><td> </td><td class="rblock"> 5.2. Header <span class="insert">Field</span> Registration . . . . . . . . . . . . . . . <span class="insert">. 29</span></td><td class="lineno" valign="top"></td></tr>
142	<tr><td class="lineno" valign="top"></td><td class="lblock"> 6. Security Considerations . . . . . . . . . . . . . . . . . . . <span class="delete">30</span></td><td> </td><td class="rblock"> 6. Security Considerations . . . . . . . . . . . . . . . . . . . <span class="insert">29</span></td><td class="lineno" valign="top"></td></tr>
143	<tr><td class="lineno" valign="top"></td><td class="left"> 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right"> 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
144	<tr><td class="lineno" valign="top"></td><td class="left"> 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right"> 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
145	<tr><td class="lineno" valign="top"></td><td class="left"> 8.1. Normative References . . . . . . . . . . . . . . . . . . . 30</td><td> </td><td class="right"> 8.1. Normative References . . . . . . . . . . . . . . . . . . . 30</td><td class="lineno" valign="top"></td></tr>
146	<tr><td class="lineno" valign="top"></td><td class="left"> 8.2. Informative References . . . . . . . . . . . . . . . . . . 31</td><td> </td><td class="right"> 8.2. Informative References . . . . . . . . . . . . . . . . . . 31</td><td class="lineno" valign="top"></td></tr>
147	<tr><td><a name="diff0010" /></td></tr>
148	<tr><td class="lineno" valign="top"></td><td class="lblock"> Appendix A. <span class="delete">Compatibility with Previous Versions . . . . . . . . 32</span></td><td> </td><td class="rblock"> Appendix A. Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
149	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> A.1. Changes from RFC 2068 . . . . . . . . . . . . . . . . . . 32</span></td><td> </td><td class="rblock"> Appendix B. Collected ABNF . . . . . . . . . . . . . . . . . . . <span class="insert">31</span></td><td class="lineno" valign="top"></td></tr>
150	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> A.2.</span> Changes from RFC 2616 . . . . . . . . . . . . . . . . <span class="delete">. . 32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
151	<tr><td class="lineno" valign="top"></td><td class="lblock"> Appendix B. Collected ABNF . . . . . . . . . . . . . . . . . . . <span class="delete">32</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
152	<tr><td class="lineno" valign="top"></td><td class="left"> Appendix C. Change Log (to be removed by RFC Editor before</td><td> </td><td class="right"> Appendix C. Change Log (to be removed by RFC Editor before</td><td class="lineno" valign="top"></td></tr>
153	<tr><td><a name="diff0011" /></td></tr>
154	<tr><td class="lineno" valign="top"></td><td class="lblock"> publication) . . . . . . . . . . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock"> publication) . . . . . . . . . . . . . . . . . . . . <span class="insert">33</span></td><td class="lineno" valign="top"></td></tr>
155	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock"> C.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . <span class="insert">33</span></td><td class="lineno" valign="top"></td></tr>
156	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.2. Since draft-ietf-httpbis-p6-cache-00 . . . . . . . . . . . <span class="delete">34</span></td><td> </td><td class="rblock"> C.2. Since draft-ietf-httpbis-p6-cache-00 . . . . . . . . . . . <span class="insert">33</span></td><td class="lineno" valign="top"></td></tr>
157	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.3. Since draft-ietf-httpbis-p6-cache-01 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock"> C.3. Since draft-ietf-httpbis-p6-cache-01 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
158	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.4. Since draft-ietf-httpbis-p6-cache-02 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock"> C.4. Since draft-ietf-httpbis-p6-cache-02 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
159	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.5. Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock"> C.5. Since draft-ietf-httpbis-p6-cache-03 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
160	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.6. Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . <span class="delete">35</span></td><td> </td><td class="rblock"> C.6. Since draft-ietf-httpbis-p6-cache-04 . . . . . . . . . . . <span class="insert">34</span></td><td class="lineno" valign="top"></td></tr>
161	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.7. Since draft-ietf-httpbis-p6-cache-05 . . . . . . . . . . . <span class="delete">36</span></td><td> </td><td class="rblock"> C.7. Since draft-ietf-httpbis-p6-cache-05 . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
162	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.8. Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . <span class="delete">36</span></td><td> </td><td class="rblock"> C.8. Since draft-ietf-httpbis-p6-cache-06 . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
163	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.9. Since draft-ietf-httpbis-p6-cache-07 . . . . . . . . . . . <span class="delete">36</span></td><td> </td><td class="rblock"> C.9. Since draft-ietf-httpbis-p6-cache-07 . . . . . . . . . . . <span class="insert">35</span></td><td class="lineno" valign="top"></td></tr>
164	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.10. Since draft-ietf-httpbis-p6-cache-08 . . . . . . . . . . . <span class="delete">37</span></td><td> </td><td class="rblock"> C.10. Since draft-ietf-httpbis-p6-cache-08 . . . . . . . . . . . <span class="insert">36</span></td><td class="lineno" valign="top"></td></tr>
165	<tr><td class="lineno" valign="top"></td><td class="lblock"> C.11. Since draft-ietf-httpbis-p6-cache-09 . . . . . . . . . . . 37</td><td> </td><td class="rblock"> C.11. Since draft-ietf-httpbis-p6-cache-09 . . . . . . . . . . . <span class="insert">36</span></td><td class="lineno" valign="top"></td></tr>
166	<tr><td class="lineno" valign="top"></td><td class="lblock"> Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">38</span></td><td> </td><td class="rblock"><span class="insert"> C.12. Since draft-ietf-httpbis-p6-cache-10 . . . . . . . . . . .</span> 37</td><td class="lineno" valign="top"></td></tr>
167	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">37</span></td><td class="lineno" valign="top"></td></tr>
168	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
169	<tr><td class="lineno" valign="top"></td><td class="left">1. Introduction</td><td> </td><td class="right">1. Introduction</td><td class="lineno" valign="top"></td></tr>
170	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
171	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP is typically used for distributed information systems, where</td><td> </td><td class="right"> HTTP is typically used for distributed information systems, where</td><td class="lineno" valign="top"></td></tr>
172	<tr><td class="lineno" valign="top"></td><td class="left"> performance can be improved by the use of response caches. This</td><td> </td><td class="right"> performance can be improved by the use of response caches. This</td><td class="lineno" valign="top"></td></tr>
173	<tr><td class="lineno" valign="top"></td><td class="left"> document defines aspects of HTTP/1.1 related to caching and reusing</td><td> </td><td class="right"> document defines aspects of HTTP/1.1 related to caching and reusing</td><td class="lineno" valign="top"></td></tr>
174	<tr><td class="lineno" valign="top"></td><td class="left"> response messages.</td><td> </td><td class="right"> response messages.</td><td class="lineno" valign="top"></td></tr>
175	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
176	<tr><td class="lineno" valign="top"></td><td class="left">1.1. Purpose</td><td> </td><td class="right">1.1. Purpose</td><td class="lineno" valign="top"></td></tr>
177	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
178	<tr><td class="lineno" valign="top"></td><td class="left"> An HTTP cache is a local store of response messages and the subsystem</td><td> </td><td class="right"> An HTTP cache is a local store of response messages and the subsystem</td><td class="lineno" valign="top"></td></tr>
179	<tr><td class="lineno" valign="top"></td><td class="left"> that controls its message storage, retrieval, and deletion. A cache</td><td> </td><td class="right"> that controls its message storage, retrieval, and deletion. A cache</td><td class="lineno" valign="top"></td></tr>
180	<tr><td class="lineno" valign="top"></td><td class="left"> stores cacheable responses in order to reduce the response time and</td><td> </td><td class="right"> stores cacheable responses in order to reduce the response time and</td><td class="lineno" valign="top"></td></tr>
181	<tr><td class="lineno" valign="top"></td><td class="left"> network bandwidth consumption on future, equivalent requests. Any</td><td> </td><td class="right"> network bandwidth consumption on future, equivalent requests. Any</td><td class="lineno" valign="top"></td></tr>
182	<tr><td><a name="diff0012" /></td></tr>
183	<tr><td class="lineno" valign="top"></td><td class="lblock"> client or server <span class="delete">may include</span> a cache, though a cache cannot be used</td><td> </td><td class="rblock"> client or server <span class="insert">MAY employ</span> a cache, though a cache cannot be used by</td><td class="lineno" valign="top"></td></tr>
184	<tr><td class="lineno" valign="top"></td><td class="lblock"> by a server that is acting as a tunnel.</td><td> </td><td class="rblock"> a server that is acting as a tunnel.</td><td class="lineno" valign="top"></td></tr>
185	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
186	<tr><td class="lineno" valign="top"></td><td class="left"> Caching would be useless if it did not significantly improve</td><td> </td><td class="right"> Caching would be useless if it did not significantly improve</td><td class="lineno" valign="top"></td></tr>
187	<tr><td class="lineno" valign="top"></td><td class="left"> performance. The goal of caching in HTTP/1.1 is to reuse a prior</td><td> </td><td class="right"> performance. The goal of caching in HTTP/1.1 is to reuse a prior</td><td class="lineno" valign="top"></td></tr>
188	<tr><td class="lineno" valign="top"></td><td class="left"> response message to satisfy a current request. In some cases, a</td><td> </td><td class="right"> response message to satisfy a current request. In some cases, a</td><td class="lineno" valign="top"></td></tr>
189	<tr><td class="lineno" valign="top"></td><td class="left"> stored response can be reused without the need for a network request,</td><td> </td><td class="right"> stored response can be reused without the need for a network request,</td><td class="lineno" valign="top"></td></tr>
190	<tr><td class="lineno" valign="top"></td><td class="left"> reducing latency and network round-trips; a "freshness" mechanism is</td><td> </td><td class="right"> reducing latency and network round-trips; a "freshness" mechanism is</td><td class="lineno" valign="top"></td></tr>
191	<tr><td class="lineno" valign="top"></td><td class="left"> used for this purpose (see Section 2.3). Even when a new request is</td><td> </td><td class="right"> used for this purpose (see Section 2.3). Even when a new request is</td><td class="lineno" valign="top"></td></tr>
192	<tr><td class="lineno" valign="top"></td><td class="left"> required, it is often possible to reuse all or parts of the payload</td><td> </td><td class="right"> required, it is often possible to reuse all or parts of the payload</td><td class="lineno" valign="top"></td></tr>
193	<tr><td class="lineno" valign="top"></td><td class="left"> of a prior response to satisfy the request, thereby reducing network</td><td> </td><td class="right"> of a prior response to satisfy the request, thereby reducing network</td><td class="lineno" valign="top"></td></tr>
194	<tr><td class="lineno" valign="top"></td><td class="left"> bandwidth usage; a "validation" mechanism is used for this purpose</td><td> </td><td class="right"> bandwidth usage; a "validation" mechanism is used for this purpose</td><td class="lineno" valign="top"></td></tr>
195	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
196	<tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 5, line 41</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 5, line 41</em></th><td></td></tr>
197	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
198	<tr><td class="lineno" valign="top"></td><td class="left">1.2. Terminology</td><td> </td><td class="right">1.2. Terminology</td><td class="lineno" valign="top"></td></tr>
199	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
200	<tr><td class="lineno" valign="top"></td><td class="left"> This specification uses a number of terms to refer to the roles</td><td> </td><td class="right"> This specification uses a number of terms to refer to the roles</td><td class="lineno" valign="top"></td></tr>
201	<tr><td class="lineno" valign="top"></td><td class="left"> played by participants in, and objects of, HTTP caching.</td><td> </td><td class="right"> played by participants in, and objects of, HTTP caching.</td><td class="lineno" valign="top"></td></tr>
202	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
203	<tr><td class="lineno" valign="top"></td><td class="left"> cacheable</td><td> </td><td class="right"> cacheable</td><td class="lineno" valign="top"></td></tr>
204	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
205	<tr><td class="lineno" valign="top"></td><td class="left"> A response is cacheable if a cache is allowed to store a copy of</td><td> </td><td class="right"> A response is cacheable if a cache is allowed to store a copy of</td><td class="lineno" valign="top"></td></tr>
206	<tr><td class="lineno" valign="top"></td><td class="left"> the response message for use in answering subsequent requests.</td><td> </td><td class="right"> the response message for use in answering subsequent requests.</td><td class="lineno" valign="top"></td></tr>
207	<tr><td><a name="diff0013" /></td></tr>
208	<tr><td class="lineno" valign="top"></td><td class="lblock"> Even when a response is cacheable, there m<span class="delete">ay</span> be additional</td><td> </td><td class="rblock"> Even when a response is cacheable, there m<span class="insert">ight</span> be additional</td><td class="lineno" valign="top"></td></tr>
209	<tr><td class="lineno" valign="top"></td><td class="left"> constraints on whether a cache can use the cached copy to satisfy</td><td> </td><td class="right"> constraints on whether a cache can use the cached copy to satisfy</td><td class="lineno" valign="top"></td></tr>
210	<tr><td class="lineno" valign="top"></td><td class="left"> a particular request.</td><td> </td><td class="right"> a particular request.</td><td class="lineno" valign="top"></td></tr>
211	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
212	<tr><td class="lineno" valign="top"></td><td class="left"> explicit expiration time</td><td> </td><td class="right"> explicit expiration time</td><td class="lineno" valign="top"></td></tr>
213	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
214	<tr><td><a name="diff0014" /></td></tr>
215	<tr><td class="lineno" valign="top"></td><td class="lblock"> The time at which the origin server intends that a<span class="delete">n entity should</span></td><td> </td><td class="rblock"> The time at which the origin server intends that a<span class="insert"> representation</span></td><td class="lineno" valign="top"></td></tr>
216	<tr><td class="lineno" valign="top"></td><td class="left"> no longer be returned by a cache without further validation.</td><td> </td><td class="right"> no longer be returned by a cache without further validation.</td><td class="lineno" valign="top"></td></tr>
217	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
218	<tr><td class="lineno" valign="top"></td><td class="left"> heuristic expiration time</td><td> </td><td class="right"> heuristic expiration time</td><td class="lineno" valign="top"></td></tr>
219	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
220	<tr><td class="lineno" valign="top"></td><td class="left"> An expiration time assigned by a cache when no explicit expiration</td><td> </td><td class="right"> An expiration time assigned by a cache when no explicit expiration</td><td class="lineno" valign="top"></td></tr>
221	<tr><td class="lineno" valign="top"></td><td class="left"> time is available.</td><td> </td><td class="right"> time is available.</td><td class="lineno" valign="top"></td></tr>
222	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
223	<tr><td class="lineno" valign="top"></td><td class="left"> age</td><td> </td><td class="right"> age</td><td class="lineno" valign="top"></td></tr>
224	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
225	<tr><td class="lineno" valign="top"></td><td class="left"> The age of a response is the time since it was sent by, or</td><td> </td><td class="right"> The age of a response is the time since it was sent by, or</td><td class="lineno" valign="top"></td></tr>
226	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
227	<tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 6, line 37</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 6, line 37</em></th><td></td></tr>
228	<tr><td class="lineno" valign="top"></td><td class="left"> A response is fresh if its age has not yet exceeded its freshness</td><td> </td><td class="right"> A response is fresh if its age has not yet exceeded its freshness</td><td class="lineno" valign="top"></td></tr>
229	<tr><td class="lineno" valign="top"></td><td class="left"> lifetime.</td><td> </td><td class="right"> lifetime.</td><td class="lineno" valign="top"></td></tr>
230	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
231	<tr><td class="lineno" valign="top"></td><td class="left"> stale</td><td> </td><td class="right"> stale</td><td class="lineno" valign="top"></td></tr>
232	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
233	<tr><td class="lineno" valign="top"></td><td class="left"> A response is stale if its age has passed its freshness lifetime</td><td> </td><td class="right"> A response is stale if its age has passed its freshness lifetime</td><td class="lineno" valign="top"></td></tr>
234	<tr><td class="lineno" valign="top"></td><td class="left"> (either explicit or heuristic).</td><td> </td><td class="right"> (either explicit or heuristic).</td><td class="lineno" valign="top"></td></tr>
235	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
236	<tr><td class="lineno" valign="top"></td><td class="left"> validator</td><td> </td><td class="right"> validator</td><td class="lineno" valign="top"></td></tr>
237	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
238	<tr><td><a name="diff0015" /></td></tr>
239	<tr><td class="lineno" valign="top"></td><td class="lblock"> A protocol element (e.g., an <span class="delete">entity tag</span> or a Last-Modified time)</td><td> </td><td class="rblock"> A protocol element (e.g., an <span class="insert">entity-tag</span> or a Last-Modified time)</td><td class="lineno" valign="top"></td></tr>
240	<tr><td class="lineno" valign="top"></td><td class="lblock"> that is used to find out whether a stored response <span class="delete">is</span> an</td><td> </td><td class="rblock"> that is used to find out whether a stored response <span class="insert">has</span> an</td><td class="lineno" valign="top"></td></tr>
241	<tr><td class="lineno" valign="top"></td><td class="lblock"> equivalent copy of <span class="delete">an entity.</span></td><td> </td><td class="rblock"> equivalent copy of <span class="insert">a representation.</span></td><td class="lineno" valign="top"></td></tr>
242	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
243	<tr><td class="lineno" valign="top"></td><td class="left"> shared cache</td><td> </td><td class="right"> shared cache</td><td class="lineno" valign="top"></td></tr>
244	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
245	<tr><td class="lineno" valign="top"></td><td class="left"> A cache that is accessible to more than one user. A non-shared</td><td> </td><td class="right"> A cache that is accessible to more than one user. A non-shared</td><td class="lineno" valign="top"></td></tr>
246	<tr><td class="lineno" valign="top"></td><td class="left"> cache is dedicated to a single user.</td><td> </td><td class="right"> cache is dedicated to a single user.</td><td class="lineno" valign="top"></td></tr>
247	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
248	<tr><td class="lineno" valign="top"></td><td class="left">1.3. Requirements</td><td> </td><td class="right">1.3. Requirements</td><td class="lineno" valign="top"></td></tr>
249	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
250	<tr><td class="lineno" valign="top"></td><td class="left"> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</td><td> </td><td class="right"> The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</td><td class="lineno" valign="top"></td></tr>
251	<tr><td class="lineno" valign="top"></td><td class="left"> "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this</td><td> </td><td class="right"> "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this</td><td class="lineno" valign="top"></td></tr>
252	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
253	<tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 9, line 14</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 9, line 14</em></th><td></td></tr>
254	<tr><td class="lineno" valign="top"></td><td class="left"> status code.</td><td> </td><td class="right"> status code.</td><td class="lineno" valign="top"></td></tr>
255	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
256	<tr><td class="lineno" valign="top"></td><td class="left"> A cache that does not support the Range and Content-Range headers</td><td> </td><td class="right"> A cache that does not support the Range and Content-Range headers</td><td class="lineno" valign="top"></td></tr>
257	<tr><td class="lineno" valign="top"></td><td class="left"> MUST NOT store incomplete or partial responses.</td><td> </td><td class="right"> MUST NOT store incomplete or partial responses.</td><td class="lineno" valign="top"></td></tr>
258	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
259	<tr><td class="lineno" valign="top"></td><td class="left">2.2. Constructing Responses from Caches</td><td> </td><td class="right">2.2. Constructing Responses from Caches</td><td class="lineno" valign="top"></td></tr>
260	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
261	<tr><td class="lineno" valign="top"></td><td class="left"> For a presented request, a cache MUST NOT return a stored response,</td><td> </td><td class="right"> For a presented request, a cache MUST NOT return a stored response,</td><td class="lineno" valign="top"></td></tr>
262	<tr><td class="lineno" valign="top"></td><td class="left"> unless:</td><td> </td><td class="right"> unless:</td><td class="lineno" valign="top"></td></tr>
263	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
264	<tr><td><a name="diff0016" /></td></tr>
265	<tr><td class="lineno" valign="top"></td><td class="lblock"> o The presented <span class="delete">Effective R</span>equest URI (Section 4.3 of [Part1]) and</td><td> </td><td class="rblock"> o The presented <span class="insert">effective r</span>equest URI (Section 4.3 of [Part1]) and</td><td class="lineno" valign="top"></td></tr>
266	<tr><td class="lineno" valign="top"></td><td class="left"> that of the stored response match, and</td><td> </td><td class="right"> that of the stored response match, and</td><td class="lineno" valign="top"></td></tr>
267	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
268	<tr><td class="lineno" valign="top"></td><td class="left"> o the request method associated with the stored response allows it</td><td> </td><td class="right"> o the request method associated with the stored response allows it</td><td class="lineno" valign="top"></td></tr>
269	<tr><td class="lineno" valign="top"></td><td class="left"> to be used for the presented request, and</td><td> </td><td class="right"> to be used for the presented request, and</td><td class="lineno" valign="top"></td></tr>
270	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
271	<tr><td class="lineno" valign="top"></td><td class="left"> o selecting request-headers nominated by the stored response (if</td><td> </td><td class="right"> o selecting request-headers nominated by the stored response (if</td><td class="lineno" valign="top"></td></tr>
272	<tr><td class="lineno" valign="top"></td><td class="left"> any) match those presented (see Section 2.7), and</td><td> </td><td class="right"> any) match those presented (see Section 2.7), and</td><td class="lineno" valign="top"></td></tr>
273	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
274	<tr><td class="lineno" valign="top"></td><td class="left"> o the presented request and stored response are free from directives</td><td> </td><td class="right"> o the presented request and stored response are free from directives</td><td class="lineno" valign="top"></td></tr>
275	<tr><td class="lineno" valign="top"></td><td class="left"> that would prevent its use (see Section 3.2 and Section 3.4), and</td><td> </td><td class="right"> that would prevent its use (see Section 3.2 and Section 3.4), and</td><td class="lineno" valign="top"></td></tr>
276	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
277	<tr><td class="lineno" valign="top"></td><td class="left"> o the stored response is either:</td><td> </td><td class="right"> o the stored response is either:</td><td class="lineno" valign="top"></td></tr>
278	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
279	<tr><td class="lineno" valign="top"></td><td class="left"> * fresh (see Section 2.3), or</td><td> </td><td class="right"> * fresh (see Section 2.3), or</td><td class="lineno" valign="top"></td></tr>
280	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
281	<tr><td class="lineno" valign="top"></td><td class="left"> * allowed to be served stale (see Section 2.3.3), or</td><td> </td><td class="right"> * allowed to be served stale (see Section 2.3.3), or</td><td class="lineno" valign="top"></td></tr>
282	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
283	<tr><td class="lineno" valign="top"></td><td class="left"> * successfully validated (see Section 2.4).</td><td> </td><td class="right"> * successfully validated (see Section 2.4).</td><td class="lineno" valign="top"></td></tr>
284	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
285	<tr><td><a name="diff0017" /></td></tr>
286	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">[[TODO-method-cacheability: define method cacheability for GET, HEAD</span></td><td> </td><td class="rblock"> When a stored response is used to satisfy a <span class="insert">request without</span></td><td class="lineno" valign="top"></td></tr>
287	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> and POST in p2-semantics.]]</span></td><td> </td><td class="rblock"><span class="insert"> validation,</span> caches MUST include a single Age header field</td><td class="lineno" valign="top"></td></tr>
288	<tr><td class="lineno" valign="top"></td><td class="lblock"> </td><td> </td><td class="rblock"> (Section 3.1) in the response with a value equal to the stored</td><td class="lineno" valign="top"></td></tr>
289	<tr><td class="lineno" valign="top"></td><td class="lblock"> When a stored response is used to satisfy a <span class="delete">request,</span> caches MUST</td><td> </td><td class="rblock"> response's current_age; see Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
290	<tr><td class="lineno" valign="top"></td><td class="lblock"> include a single Age header field (Section 3.1) in the response with</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
291	<tr><td class="lineno" valign="top"></td><td class="lblock"> a value equal to the stored response's current_age; see</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
292	<tr><td class="lineno" valign="top"></td><td class="lblock"> Section 2.3.2. <span class="delete">[[DISCUSS-includes-validated: this currently includes</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
293	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> successfully validated responses.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
294	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
295	<tr><td class="lineno" valign="top"></td><td class="left"> Requests with methods that are unsafe (Section 7.1.1 of [Part2]) MUST</td><td> </td><td class="right"> Requests with methods that are unsafe (Section 7.1.1 of [Part2]) MUST</td><td class="lineno" valign="top"></td></tr>
296	<tr><td class="lineno" valign="top"></td><td class="left"> be written through the cache to the origin server; i.e., a cache must</td><td> </td><td class="right"> be written through the cache to the origin server; i.e., a cache must</td><td class="lineno" valign="top"></td></tr>
297	<tr><td class="lineno" valign="top"></td><td class="left"> not reply to such a request before having forwarded the request and</td><td> </td><td class="right"> not reply to such a request before having forwarded the request and</td><td class="lineno" valign="top"></td></tr>
298	<tr><td class="lineno" valign="top"></td><td class="left"> having received a corresponding response.</td><td> </td><td class="right"> having received a corresponding response.</td><td class="lineno" valign="top"></td></tr>
299	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
300	<tr><td class="lineno" valign="top"></td><td class="left"> Also, note that unsafe requests might invalidate already stored</td><td> </td><td class="right"> Also, note that unsafe requests might invalidate already stored</td><td class="lineno" valign="top"></td></tr>
301	<tr><td class="lineno" valign="top"></td><td class="left"> responses; see Section 2.5.</td><td> </td><td class="right"> responses; see Section 2.5.</td><td class="lineno" valign="top"></td></tr>
302	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
303	<tr><td class="lineno" valign="top"></td><td class="left"> Caches MUST use the most recent response (as determined by the Date</td><td> </td><td class="right"> Caches MUST use the most recent response (as determined by the Date</td><td class="lineno" valign="top"></td></tr>
304	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
305	<tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 10, line 19</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 10, line 16</em></th><td></td></tr>
306	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
307	<tr><td class="lineno" valign="top"></td><td class="left"> When a response is "fresh" in the cache, it can be used to satisfy</td><td> </td><td class="right"> When a response is "fresh" in the cache, it can be used to satisfy</td><td class="lineno" valign="top"></td></tr>
308	<tr><td class="lineno" valign="top"></td><td class="left"> subsequent requests without contacting the origin server, thereby</td><td> </td><td class="right"> subsequent requests without contacting the origin server, thereby</td><td class="lineno" valign="top"></td></tr>
309	<tr><td class="lineno" valign="top"></td><td class="left"> improving efficiency.</td><td> </td><td class="right"> improving efficiency.</td><td class="lineno" valign="top"></td></tr>
310	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
311	<tr><td class="lineno" valign="top"></td><td class="left"> The primary mechanism for determining freshness is for an origin</td><td> </td><td class="right"> The primary mechanism for determining freshness is for an origin</td><td class="lineno" valign="top"></td></tr>
312	<tr><td class="lineno" valign="top"></td><td class="left"> server to provide an explicit expiration time in the future, using</td><td> </td><td class="right"> server to provide an explicit expiration time in the future, using</td><td class="lineno" valign="top"></td></tr>
313	<tr><td class="lineno" valign="top"></td><td class="left"> either the Expires header (Section 3.3) or the max-age response cache</td><td> </td><td class="right"> either the Expires header (Section 3.3) or the max-age response cache</td><td class="lineno" valign="top"></td></tr>
314	<tr><td class="lineno" valign="top"></td><td class="left"> directive (Section 3.2.2). Generally, origin servers will assign</td><td> </td><td class="right"> directive (Section 3.2.2). Generally, origin servers will assign</td><td class="lineno" valign="top"></td></tr>
315	<tr><td class="lineno" valign="top"></td><td class="left"> future explicit expiration times to responses in the belief that the</td><td> </td><td class="right"> future explicit expiration times to responses in the belief that the</td><td class="lineno" valign="top"></td></tr>
316	<tr><td><a name="diff0018" /></td></tr>
317	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">entity</span> is not likely to change in a semantically significant way</td><td> </td><td class="rblock"> <span class="insert">representation</span> is not likely to change in a semantically significant</td><td class="lineno" valign="top"></td></tr>
318	<tr><td class="lineno" valign="top"></td><td class="lblock"> before the expiration time is reached.</td><td> </td><td class="rblock"> way before the expiration time is reached.</td><td class="lineno" valign="top"></td></tr>
319	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
320	<tr><td class="lineno" valign="top"></td><td class="left"> If an origin server wishes to force a cache to validate every</td><td> </td><td class="right"> If an origin server wishes to force a cache to validate every</td><td class="lineno" valign="top"></td></tr>
321	<tr><td><a name="diff0019" /></td></tr>
322	<tr><td class="lineno" valign="top"></td><td class="lblock"> request, it can assign an explicit expiration time in the <span class="delete">past. This</span></td><td> </td><td class="rblock"> request, it can assign an explicit expiration time in the <span class="insert">past to</span></td><td class="lineno" valign="top"></td></tr>
323	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> means</span> that the response is <span class="delete">always stale, so that</span> caches <span class="delete">should</span></td><td> </td><td class="rblock"><span class="insert"> indicate</span> that the response is <span class="insert">already stale. Compliant</span> caches <span class="insert">will</span></td><td class="lineno" valign="top"></td></tr>
324	<tr><td class="lineno" valign="top"></td><td class="lblock"> validate <span class="delete">it</span> before <span class="delete">using</span> it for subsequent requests. <span class="delete">[[TODO-</span></td><td> </td><td class="rblock"> validate <span class="insert">the cached response</span> before <span class="insert">reusing</span> it for subsequent</td><td class="lineno" valign="top"></td></tr>
325	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> response-stale: This wording may cause confusion, because the</span></td><td> </td><td class="rblock"> requests.</td><td class="lineno" valign="top"></td></tr>
326	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> response may still be served stale.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
327	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
328	<tr><td class="lineno" valign="top"></td><td class="left"> Since origin servers do not always provide explicit expiration times,</td><td> </td><td class="right"> Since origin servers do not always provide explicit expiration times,</td><td class="lineno" valign="top"></td></tr>
329	<tr><td><a name="diff0020" /></td></tr>
330	<tr><td class="lineno" valign="top"></td><td class="lblock"> HTTP caches <span class="delete">may also</span> assign heuristic expiration times when <span class="delete">they</span> are</td><td> </td><td class="rblock"> HTTP caches <span class="insert">MAY</span> assign heuristic expiration times when <span class="insert">explicit times</span></td><td class="lineno" valign="top"></td></tr>
331	<tr><td class="lineno" valign="top"></td><td class="lblock"> not specified, employing algorithms that use other header values</td><td> </td><td class="rblock"> are not specified, employing algorithms that use other header values</td><td class="lineno" valign="top"></td></tr>
332	<tr><td class="lineno" valign="top"></td><td class="left"> (such as the Last-Modified time) to estimate a plausible expiration</td><td> </td><td class="right"> (such as the Last-Modified time) to estimate a plausible expiration</td><td class="lineno" valign="top"></td></tr>
333	<tr><td class="lineno" valign="top"></td><td class="left"> time. The HTTP/1.1 specification does not provide specific</td><td> </td><td class="right"> time. The HTTP/1.1 specification does not provide specific</td><td class="lineno" valign="top"></td></tr>
334	<tr><td class="lineno" valign="top"></td><td class="left"> algorithms, but does impose worst-case constraints on their results.</td><td> </td><td class="right"> algorithms, but does impose worst-case constraints on their results.</td><td class="lineno" valign="top"></td></tr>
335	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
336	<tr><td class="lineno" valign="top"></td><td class="left"> The calculation to determine if a response is fresh is:</td><td> </td><td class="right"> The calculation to determine if a response is fresh is:</td><td class="lineno" valign="top"></td></tr>
337	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
338	<tr><td class="lineno" valign="top"></td><td class="left"> response_is_fresh = (freshness_lifetime > current_age)</td><td> </td><td class="right"> response_is_fresh = (freshness_lifetime > current_age)</td><td class="lineno" valign="top"></td></tr>
339	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
340	<tr><td class="lineno" valign="top"></td><td class="left"> The freshness_lifetime is defined in Section 2.3.1; the current_age</td><td> </td><td class="right"> The freshness_lifetime is defined in Section 2.3.1; the current_age</td><td class="lineno" valign="top"></td></tr>
341	<tr><td class="lineno" valign="top"></td><td class="left"> is defined in Section 2.3.2.</td><td> </td><td class="right"> is defined in Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
342	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
343	<tr><td><a name="diff0021" /></td></tr>
344	<tr><td class="lineno" valign="top"></td><td class="lblock"> Additionally, clients m<span class="delete">ay</span> need to influence freshness calculation.</td><td> </td><td class="rblock"> Additionally, clients m<span class="insert">ight</span> need to influence freshness calculation.</td><td class="lineno" valign="top"></td></tr>
345	<tr><td class="lineno" valign="top"></td><td class="left"> They can do this using several request cache directives, with the</td><td> </td><td class="right"> They can do this using several request cache directives, with the</td><td class="lineno" valign="top"></td></tr>
346	<tr><td class="lineno" valign="top"></td><td class="left"> effect of either increasing or loosening constraints on freshness.</td><td> </td><td class="right"> effect of either increasing or loosening constraints on freshness.</td><td class="lineno" valign="top"></td></tr>
347	<tr><td class="lineno" valign="top"></td><td class="left"> See Section 3.2.1.</td><td> </td><td class="right"> See Section 3.2.1.</td><td class="lineno" valign="top"></td></tr>
348	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
349	<tr><td class="lineno" valign="top"></td><td class="left"> [[ISSUE-no-req-for-directives: there are not requirements directly</td><td> </td><td class="right"> [[ISSUE-no-req-for-directives: there are not requirements directly</td><td class="lineno" valign="top"></td></tr>
350	<tr><td class="lineno" valign="top"></td><td class="left"> applying to cache-request-directives and freshness.]]</td><td> </td><td class="right"> applying to cache-request-directives and freshness.]]</td><td class="lineno" valign="top"></td></tr>
351	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
352	<tr><td class="lineno" valign="top"></td><td class="left"> Note that freshness applies only to cache operation; it cannot be</td><td> </td><td class="right"> Note that freshness applies only to cache operation; it cannot be</td><td class="lineno" valign="top"></td></tr>
353	<tr><td class="lineno" valign="top"></td><td class="left"> used to force a user agent to refresh its display or reload a</td><td> </td><td class="right"> used to force a user agent to refresh its display or reload a</td><td class="lineno" valign="top"></td></tr>
354	<tr><td class="lineno" valign="top"></td><td class="left"> resource. See Section 4 for an explanation of the difference between</td><td> </td><td class="right"> resource. See Section 4 for an explanation of the difference between</td><td class="lineno" valign="top"></td></tr>
355	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
356	<tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 11, line 32</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 11, line 29</em></th><td></td></tr>
357	<tr><td class="lineno" valign="top"></td><td class="left"> o Otherwise, no explicit expiration time is present in the response.</td><td> </td><td class="right"> o Otherwise, no explicit expiration time is present in the response.</td><td class="lineno" valign="top"></td></tr>
358	<tr><td class="lineno" valign="top"></td><td class="left"> A heuristic freshness lifetime might be applicable; see</td><td> </td><td class="right"> A heuristic freshness lifetime might be applicable; see</td><td class="lineno" valign="top"></td></tr>
359	<tr><td class="lineno" valign="top"></td><td class="left"> Section 2.3.1.1.</td><td> </td><td class="right"> Section 2.3.1.1.</td><td class="lineno" valign="top"></td></tr>
360	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
361	<tr><td class="lineno" valign="top"></td><td class="left"> Note that this calculation is not vulnerable to clock skew, since all</td><td> </td><td class="right"> Note that this calculation is not vulnerable to clock skew, since all</td><td class="lineno" valign="top"></td></tr>
362	<tr><td class="lineno" valign="top"></td><td class="left"> of the information comes from the origin server.</td><td> </td><td class="right"> of the information comes from the origin server.</td><td class="lineno" valign="top"></td></tr>
363	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
364	<tr><td class="lineno" valign="top"></td><td class="left">2.3.1.1. Calculating Heuristic Freshness</td><td> </td><td class="right">2.3.1.1. Calculating Heuristic Freshness</td><td class="lineno" valign="top"></td></tr>
365	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
366	<tr><td class="lineno" valign="top"></td><td class="left"> If no explicit expiration time is present in a stored response that</td><td> </td><td class="right"> If no explicit expiration time is present in a stored response that</td><td class="lineno" valign="top"></td></tr>
367	<tr><td><a name="diff0022" /></td></tr>
368	<tr><td class="lineno" valign="top"></td><td class="lblock"> has a status code of 200, 203, 206, 300, 301 <span class="delete">or 410,</span> a heuristic</td><td> </td><td class="rblock"> has a status code <span class="insert">whose definition allows heuristic freshness to be</span></td><td class="lineno" valign="top"></td></tr>
369	<tr><td class="lineno" valign="top"></td><td class="lblock"> expiration time <span class="delete">can</span> be calculated. Heuristics MUST NOT be used for</td><td> </td><td class="rblock"><span class="insert"> used (including the following in Section 8</span> of <span class="insert">[Part2]:</span> 200, 203, 206,</td><td class="lineno" valign="top"></td></tr>
370	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">other</span> response status <span class="delete">codes.</span></td><td> </td><td class="rblock"> 300, 301 <span class="insert">and 410),</span> a heuristic expiration time <span class="insert">MAY</span> be calculated.</td><td class="lineno" valign="top"></td></tr>
371	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> Heuristics MUST NOT be used for response status <span class="insert">codes that do not</span></td><td class="lineno" valign="top"></td></tr>
372	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> explicitly allow it.</span></td><td class="lineno" valign="top"></td></tr>
373	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
374	<tr><td class="lineno" valign="top"></td><td class="left"> When a heuristic is used to calculate freshness lifetime, the cache</td><td> </td><td class="right"> When a heuristic is used to calculate freshness lifetime, the cache</td><td class="lineno" valign="top"></td></tr>
375	<tr><td class="lineno" valign="top"></td><td class="left"> SHOULD attach a Warning header with a 113 warn-code to the response</td><td> </td><td class="right"> SHOULD attach a Warning header with a 113 warn-code to the response</td><td class="lineno" valign="top"></td></tr>
376	<tr><td class="lineno" valign="top"></td><td class="left"> if its current_age is more than 24 hours and such a warning is not</td><td> </td><td class="right"> if its current_age is more than 24 hours and such a warning is not</td><td class="lineno" valign="top"></td></tr>
377	<tr><td class="lineno" valign="top"></td><td class="left"> already present.</td><td> </td><td class="right"> already present.</td><td class="lineno" valign="top"></td></tr>
378	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
379	<tr><td class="lineno" valign="top"></td><td class="left"> Also, if the response has a Last-Modified header (Section 6.6 of</td><td> </td><td class="right"> Also, if the response has a Last-Modified header (Section 6.6 of</td><td class="lineno" valign="top"></td></tr>
380	<tr><td class="lineno" valign="top"></td><td class="left"> [Part4]), the heuristic expiration value SHOULD be no more than some</td><td> </td><td class="right"> [Part4]), the heuristic expiration value SHOULD be no more than some</td><td class="lineno" valign="top"></td></tr>
381	<tr><td class="lineno" valign="top"></td><td class="left"> fraction of the interval since that time. A typical setting of this</td><td> </td><td class="right"> fraction of the interval since that time. A typical setting of this</td><td class="lineno" valign="top"></td></tr>
382	<tr><td class="lineno" valign="top"></td><td class="left"> fraction might be 10%.</td><td> </td><td class="right"> fraction might be 10%.</td><td class="lineno" valign="top"></td></tr>
383	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
384	<tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 14, line 39</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 14, line 39</em></th><td></td></tr>
385	<tr><td class="lineno" valign="top"></td><td class="left"> requested URI, if present. However, if any of the stored responses</td><td> </td><td class="right"> requested URI, if present. However, if any of the stored responses</td><td class="lineno" valign="top"></td></tr>
386	<tr><td class="lineno" valign="top"></td><td class="left"> contains only partial content, its entity-tag SHOULD NOT be included</td><td> </td><td class="right"> contains only partial content, its entity-tag SHOULD NOT be included</td><td class="lineno" valign="top"></td></tr>
387	<tr><td class="lineno" valign="top"></td><td class="left"> in the If-None-Match header field unless the request is for a range</td><td> </td><td class="right"> in the If-None-Match header field unless the request is for a range</td><td class="lineno" valign="top"></td></tr>
388	<tr><td class="lineno" valign="top"></td><td class="left"> that would be fully satisfied by that stored response.</td><td> </td><td class="right"> that would be fully satisfied by that stored response.</td><td class="lineno" valign="top"></td></tr>
389	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
390	<tr><td class="lineno" valign="top"></td><td class="left"> A 304 (Not Modified) response status code indicates that the stored</td><td> </td><td class="right"> A 304 (Not Modified) response status code indicates that the stored</td><td class="lineno" valign="top"></td></tr>
391	<tr><td class="lineno" valign="top"></td><td class="left"> response can be updated and reused; see Section 2.8.</td><td> </td><td class="right"> response can be updated and reused; see Section 2.8.</td><td class="lineno" valign="top"></td></tr>
392	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
393	<tr><td class="lineno" valign="top"></td><td class="left"> A full response (i.e., one with a response body) indicates that none</td><td> </td><td class="right"> A full response (i.e., one with a response body) indicates that none</td><td class="lineno" valign="top"></td></tr>
394	<tr><td class="lineno" valign="top"></td><td class="left"> of the stored responses nominated in the conditional request is</td><td> </td><td class="right"> of the stored responses nominated in the conditional request is</td><td class="lineno" valign="top"></td></tr>
395	<tr><td><a name="diff0023" /></td></tr>
396	<tr><td class="lineno" valign="top"></td><td class="lblock"> suitable. Instead, the full response <span class="delete">is</span> used <span class="delete">both</span> to satisfy the</td><td> </td><td class="rblock"> suitable. Instead, the full response <span class="insert">SHOULD be</span> used to satisfy the</td><td class="lineno" valign="top"></td></tr>
397	<tr><td class="lineno" valign="top"></td><td class="lblock"> request and replace the stored response. <span class="delete">[[TODO-req-missing: Should</span></td><td> </td><td class="rblock"> request and <span class="insert">MAY</span> replace the stored response.</td><td class="lineno" valign="top"></td></tr>
398	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> there be a requirement here?]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
399	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
400	<tr><td class="lineno" valign="top"></td><td class="left"> If a cache receives a 5xx response while attempting to validate a</td><td> </td><td class="right"> If a cache receives a 5xx response while attempting to validate a</td><td class="lineno" valign="top"></td></tr>
401	<tr><td class="lineno" valign="top"></td><td class="left"> response, it MAY either forward this response to the requesting</td><td> </td><td class="right"> response, it MAY either forward this response to the requesting</td><td class="lineno" valign="top"></td></tr>
402	<tr><td class="lineno" valign="top"></td><td class="left"> client, or act as if the server failed to respond. In the latter</td><td> </td><td class="right"> client, or act as if the server failed to respond. In the latter</td><td class="lineno" valign="top"></td></tr>
403	<tr><td class="lineno" valign="top"></td><td class="left"> case, it MAY return a previously stored response (see Section 2.3.3).</td><td> </td><td class="right"> case, it MAY return a previously stored response (see Section 2.3.3).</td><td class="lineno" valign="top"></td></tr>
404	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
405	<tr><td class="lineno" valign="top"></td><td class="left">2.5. Request Methods that Invalidate</td><td> </td><td class="right">2.5. Request Methods that Invalidate</td><td class="lineno" valign="top"></td></tr>
406	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
407	<tr><td class="lineno" valign="top"></td><td class="left"> Because unsafe methods (Section 7.1.1 of [Part2]) have the potential</td><td> </td><td class="right"> Because unsafe methods (Section 7.1.1 of [Part2]) have the potential</td><td class="lineno" valign="top"></td></tr>
408	<tr><td class="lineno" valign="top"></td><td class="left"> for changing state on the origin server, intervening caches can use</td><td> </td><td class="right"> for changing state on the origin server, intervening caches can use</td><td class="lineno" valign="top"></td></tr>
409	<tr><td class="lineno" valign="top"></td><td class="left"> them to keep their contents up-to-date.</td><td> </td><td class="right"> them to keep their contents up-to-date.</td><td class="lineno" valign="top"></td></tr>
410	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
411	<tr><td class="lineno" valign="top"></td><td class="left"> The following HTTP methods MUST cause a cache to invalidate the</td><td> </td><td class="right"> The following HTTP methods MUST cause a cache to invalidate the</td><td class="lineno" valign="top"></td></tr>
412	<tr><td><a name="diff0024" /></td></tr>
413	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">E</span>ffective Request URI (Section 4.3 of [Part1]) as well as the URI(s)</td><td> </td><td class="rblock"> <span class="insert">e</span>ffective Request URI (Section 4.3 of [Part1]) as well as the URI(s)</td><td class="lineno" valign="top"></td></tr>
414	<tr><td class="lineno" valign="top"></td><td class="left"> in the Location and Content-Location headers (if present):</td><td> </td><td class="right"> in the Location and Content-Location headers (if present):</td><td class="lineno" valign="top"></td></tr>
415	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
416	<tr><td class="lineno" valign="top"></td><td class="left"> o PUT</td><td> </td><td class="right"> o PUT</td><td class="lineno" valign="top"></td></tr>
417	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
418	<tr><td class="lineno" valign="top"></td><td class="left"> o DELETE</td><td> </td><td class="right"> o DELETE</td><td class="lineno" valign="top"></td></tr>
419	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
420	<tr><td class="lineno" valign="top"></td><td class="left"> o POST</td><td> </td><td class="right"> o POST</td><td class="lineno" valign="top"></td></tr>
421	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
422	<tr><td class="lineno" valign="top"></td><td class="left"> An invalidation based on a URI from a Location or Content-Location</td><td> </td><td class="right"> An invalidation based on a URI from a Location or Content-Location</td><td class="lineno" valign="top"></td></tr>
423	<tr><td class="lineno" valign="top"></td><td class="left"> header MUST NOT be performed if the host part of that URI differs</td><td> </td><td class="right"> header MUST NOT be performed if the host part of that URI differs</td><td class="lineno" valign="top"></td></tr>
424	<tr><td><a name="diff0025" /></td></tr>
425	<tr><td class="lineno" valign="top"></td><td class="lblock"> from the host part in the <span class="delete">Effective R</span>equest URI (Section 4.3 of</td><td> </td><td class="rblock"> from the host part in the <span class="insert">effective r</span>equest URI (Section 4.3 of</td><td class="lineno" valign="top"></td></tr>
426	<tr><td class="lineno" valign="top"></td><td class="left"> [Part1]). This helps prevent denial of service attacks.</td><td> </td><td class="right"> [Part1]). This helps prevent denial of service attacks.</td><td class="lineno" valign="top"></td></tr>
427	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
428	<tr><td><a name="diff0026" /></td></tr>
429	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">[[TODO-def-host-part: "host part" needs to be specified better.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
430	<tr><td class="lineno" valign="top"></td><td class="lblock"> </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
431	<tr><td class="lineno" valign="top"></td><td class="left"> A cache that passes through requests for methods it does not</td><td> </td><td class="right"> A cache that passes through requests for methods it does not</td><td class="lineno" valign="top"></td></tr>
432	<tr><td><a name="diff0027" /></td></tr>
433	<tr><td class="lineno" valign="top"></td><td class="lblock"> understand SHOULD invalidate the <span class="delete">Effective R</span>equest URI (Section 4.3</td><td> </td><td class="rblock"> understand SHOULD invalidate the <span class="insert">effective r</span>equest URI (Section 4.3</td><td class="lineno" valign="top"></td></tr>
434	<tr><td class="lineno" valign="top"></td><td class="left"> of [Part1]).</td><td> </td><td class="right"> of [Part1]).</td><td class="lineno" valign="top"></td></tr>
435	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
436	<tr><td class="lineno" valign="top"></td><td class="left"> Here, "invalidate" means that the cache will either remove all stored</td><td> </td><td class="right"> Here, "invalidate" means that the cache will either remove all stored</td><td class="lineno" valign="top"></td></tr>
437	<tr><td><a name="diff0028" /></td></tr>
438	<tr><td class="lineno" valign="top"></td><td class="lblock"> responses related to the <span class="delete">Effective R</span>equest URI, or will mark these as</td><td> </td><td class="rblock"> responses related to the <span class="insert">effective r</span>equest URI, or will mark these as</td><td class="lineno" valign="top"></td></tr>
439	<tr><td class="lineno" valign="top"></td><td class="left"> "invalid" and in need of a mandatory validation before they can be</td><td> </td><td class="right"> "invalid" and in need of a mandatory validation before they can be</td><td class="lineno" valign="top"></td></tr>
440	<tr><td class="lineno" valign="top"></td><td class="left"> returned in response to a subsequent request.</td><td> </td><td class="right"> returned in response to a subsequent request.</td><td class="lineno" valign="top"></td></tr>
441	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
442	<tr><td class="lineno" valign="top"></td><td class="left"> Note that this does not guarantee that all appropriate responses are</td><td> </td><td class="right"> Note that this does not guarantee that all appropriate responses are</td><td class="lineno" valign="top"></td></tr>
443	<tr><td class="lineno" valign="top"></td><td class="left"> invalidated. For example, the request that caused the change at the</td><td> </td><td class="right"> invalidated. For example, the request that caused the change at the</td><td class="lineno" valign="top"></td></tr>
444	<tr><td class="lineno" valign="top"></td><td class="left"> origin server might not have gone through the cache where a response</td><td> </td><td class="right"> origin server might not have gone through the cache where a response</td><td class="lineno" valign="top"></td></tr>
445	<tr><td class="lineno" valign="top"></td><td class="left"> is stored.</td><td> </td><td class="right"> is stored.</td><td class="lineno" valign="top"></td></tr>
446	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
447	<tr><td><a name="diff0029" /></td></tr>
448	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">[[TODO-spec-success-invalidate: specify that only successful (2xx,</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
449	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 3xx?) responses invalidate.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
450	<tr><td class="lineno" valign="top"></td><td class="lblock"> </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
451	<tr><td class="lineno" valign="top"></td><td class="left">2.6. Shared Caching of Authenticated Responses</td><td> </td><td class="right">2.6. Shared Caching of Authenticated Responses</td><td class="lineno" valign="top"></td></tr>
452	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
453	<tr><td class="lineno" valign="top"></td><td class="left"> Shared caches MUST NOT use a cached response to a request with an</td><td> </td><td class="right"> Shared caches MUST NOT use a cached response to a request with an</td><td class="lineno" valign="top"></td></tr>
454	<tr><td class="lineno" valign="top"></td><td class="left"> Authorization header (Section 3.1 of [Part7]) to satisfy any</td><td> </td><td class="right"> Authorization header (Section 3.1 of [Part7]) to satisfy any</td><td class="lineno" valign="top"></td></tr>
455	<tr><td class="lineno" valign="top"></td><td class="left"> subsequent request unless a cache directive that allows such</td><td> </td><td class="right"> subsequent request unless a cache directive that allows such</td><td class="lineno" valign="top"></td></tr>
456	<tr><td class="lineno" valign="top"></td><td class="left"> responses to be stored is present in the response.</td><td> </td><td class="right"> responses to be stored is present in the response.</td><td class="lineno" valign="top"></td></tr>
457	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
458	<tr><td class="lineno" valign="top"></td><td class="left"> In this specification, the following Cache-Control response</td><td> </td><td class="right"> In this specification, the following Cache-Control response</td><td class="lineno" valign="top"></td></tr>
459	<tr><td class="lineno" valign="top"></td><td class="left"> directives (Section 3.2.2) have such an effect: must-revalidate,</td><td> </td><td class="right"> directives (Section 3.2.2) have such an effect: must-revalidate,</td><td class="lineno" valign="top"></td></tr>
460	<tr><td class="lineno" valign="top"></td><td class="left"> public, s-maxage.</td><td> </td><td class="right"> public, s-maxage.</td><td class="lineno" valign="top"></td></tr>
461	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
462	<tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 16, line 32</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 16, line 29</em></th><td></td></tr>
463	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
464	<tr><td class="lineno" valign="top"></td><td class="left"> o combining multiple message-header fields with the same field name</td><td> </td><td class="right"> o combining multiple message-header fields with the same field name</td><td class="lineno" valign="top"></td></tr>
465	<tr><td class="lineno" valign="top"></td><td class="left"> (see Section 3.2 of [Part1])</td><td> </td><td class="right"> (see Section 3.2 of [Part1])</td><td class="lineno" valign="top"></td></tr>
466	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
467	<tr><td class="lineno" valign="top"></td><td class="left"> o normalizing both header values in a way that is known to have</td><td> </td><td class="right"> o normalizing both header values in a way that is known to have</td><td class="lineno" valign="top"></td></tr>
468	<tr><td class="lineno" valign="top"></td><td class="left"> identical semantics, according to the header's specification</td><td> </td><td class="right"> identical semantics, according to the header's specification</td><td class="lineno" valign="top"></td></tr>
469	<tr><td class="lineno" valign="top"></td><td class="left"> (e.g., re-ordering field values when order is not significant;</td><td> </td><td class="right"> (e.g., re-ordering field values when order is not significant;</td><td class="lineno" valign="top"></td></tr>
470	<tr><td class="lineno" valign="top"></td><td class="left"> case-normalization, where values are defined to be case-</td><td> </td><td class="right"> case-normalization, where values are defined to be case-</td><td class="lineno" valign="top"></td></tr>
471	<tr><td class="lineno" valign="top"></td><td class="left"> insensitive)</td><td> </td><td class="right"> insensitive)</td><td class="lineno" valign="top"></td></tr>
472	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
473	<tr><td><a name="diff0030" /></td></tr>
474	<tr><td class="lineno" valign="top"></td><td class="lblock"> If (after any normali<span class="delete">sation that may</span> take place) a header field is</td><td> </td><td class="rblock"> If (after any normali<span class="insert">zation that might</span> take place) a header field is</td><td class="lineno" valign="top"></td></tr>
475	<tr><td class="lineno" valign="top"></td><td class="left"> absent from a request, it can only match another request if it is</td><td> </td><td class="right"> absent from a request, it can only match another request if it is</td><td class="lineno" valign="top"></td></tr>
476	<tr><td class="lineno" valign="top"></td><td class="left"> also absent there.</td><td> </td><td class="right"> also absent there.</td><td class="lineno" valign="top"></td></tr>
477	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
478	<tr><td class="lineno" valign="top"></td><td class="left"> A Vary header field-value of "" always fails to match, and</td><td> </td><td class="right"> A Vary header field-value of "" always fails to match, and</td><td class="lineno" valign="top"></td></tr>
479	<tr><td class="lineno" valign="top"></td><td class="left"> subsequent requests to that resource can only be properly interpreted</td><td> </td><td class="right"> subsequent requests to that resource can only be properly interpreted</td><td class="lineno" valign="top"></td></tr>
480	<tr><td class="lineno" valign="top"></td><td class="left"> by the origin server.</td><td> </td><td class="right"> by the origin server.</td><td class="lineno" valign="top"></td></tr>
481	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
482	<tr><td class="lineno" valign="top"></td><td class="left"> The stored response with matching selecting request-headers is known</td><td> </td><td class="right"> The stored response with matching selecting request-headers is known</td><td class="lineno" valign="top"></td></tr>
483	<tr><td class="lineno" valign="top"></td><td class="left"> as the selected response.</td><td> </td><td class="right"> as the selected response.</td><td class="lineno" valign="top"></td></tr>
484	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
485	<tr><td class="lineno" valign="top"></td><td class="left"> If no selected response is available, the cache MAY forward the</td><td> </td><td class="right"> If no selected response is available, the cache MAY forward the</td><td class="lineno" valign="top"></td></tr>
486	<tr><td class="lineno" valign="top"></td><td class="left"> presented request to the origin server in a conditional request; see</td><td> </td><td class="right"> presented request to the origin server in a conditional request; see</td><td class="lineno" valign="top"></td></tr>
487	<tr><td class="lineno" valign="top"></td><td class="left"> Section 2.4.</td><td> </td><td class="right"> Section 2.4.</td><td class="lineno" valign="top"></td></tr>
488	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
489	<tr><td class="lineno" valign="top"></td><td class="left">2.8. Combining Responses</td><td> </td><td class="right">2.8. Combining Responses</td><td class="lineno" valign="top"></td></tr>
490	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
491	<tr><td class="lineno" valign="top"></td><td class="left"> When a cache receives a 304 (Not Modified) response or a 206 (Partial</td><td> </td><td class="right"> When a cache receives a 304 (Not Modified) response or a 206 (Partial</td><td class="lineno" valign="top"></td></tr>
492	<tr><td class="lineno" valign="top"></td><td class="left"> Content) response (in this section, the "new" response"), it needs to</td><td> </td><td class="right"> Content) response (in this section, the "new" response"), it needs to</td><td class="lineno" valign="top"></td></tr>
493	<tr><td class="lineno" valign="top"></td><td class="left"> created an updated response by combining the stored response with the</td><td> </td><td class="right"> created an updated response by combining the stored response with the</td><td class="lineno" valign="top"></td></tr>
494	<tr><td class="lineno" valign="top"></td><td class="left"> new one, so that the updated response can be used to satisfy the</td><td> </td><td class="right"> new one, so that the updated response can be used to satisfy the</td><td class="lineno" valign="top"></td></tr>
495	<tr><td><a name="diff0031" /></td></tr>
496	<tr><td class="lineno" valign="top"></td><td class="lblock"> request.</td><td> </td><td class="rblock"> request<span class="insert">, and potentially update the cached response</span>.</td><td class="lineno" valign="top"></td></tr>
497	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
498	<tr><td class="lineno" valign="top"></td><td class="left"> If the new response contains an ETag, it identifies the stored</td><td> </td><td class="right"> If the new response contains an ETag, it identifies the stored</td><td class="lineno" valign="top"></td></tr>
499	<tr><td><a name="diff0032" /></td></tr>
500	<tr><td class="lineno" valign="top"></td><td class="lblock"> response to use. [[TODO-mention-CL: <span class="delete">may</span> need language about <span class="delete">Content-</span></td><td> </td><td class="rblock"> response to use. [[TODO-mention-CL: <span class="insert">might</span> need language about</td><td class="lineno" valign="top"></td></tr>
501	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Location here]][[TODO-inm-mult-etags: cover case where INM with</span></td><td> </td><td class="rblock"> <span class="insert">Content-Location here]][[TODO-select-for-combine: Shouldn't this be</span></td><td class="lineno" valign="top"></td></tr>
502	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> multiple etags was sent]]</span></td><td> </td><td class="rblock"><span class="insert"> the selected response?]]</span></td><td class="lineno" valign="top"></td></tr>
503	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
504	<tr><td><a name="diff0033" /></td></tr>
505	<tr><td class="lineno" valign="top"></td><td class="lblock"> If the status code is 206 (partial content), both the stored and new</td><td> </td><td class="rblock"> If the <span class="insert">new response's</span> status code is 206 (partial content), both the</td><td class="lineno" valign="top"></td></tr>
506	<tr><td class="lineno" valign="top"></td><td class="lblock"> responses MUST have validators, and those validators MUST match using</td><td> </td><td class="rblock"> stored and new responses MUST have validators, and those validators</td><td class="lineno" valign="top"></td></tr>
507	<tr><td class="lineno" valign="top"></td><td class="lblock"> the strong comparison function (see Section 4 of [Part4]).</td><td> </td><td class="rblock"> MUST match using the strong comparison function (see Section 4 of</td><td class="lineno" valign="top"></td></tr>
508	<tr><td class="lineno" valign="top"></td><td class="lblock"> Otherwise, the responses MUST NOT be combined.</td><td> </td><td class="rblock"> [Part4]). Otherwise, the responses MUST NOT be combined.</td><td class="lineno" valign="top"></td></tr>
509	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
510	<tr><td class="lineno" valign="top"></td><td class="left"> The stored response headers are used as those of the updated</td><td> </td><td class="right"> The stored response headers are used as those of the updated</td><td class="lineno" valign="top"></td></tr>
511	<tr><td class="lineno" valign="top"></td><td class="left"> response, except that</td><td> </td><td class="right"> response, except that</td><td class="lineno" valign="top"></td></tr>
512	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
513	<tr><td class="lineno" valign="top"></td><td class="left"> o any stored Warning headers with warn-code 1xx (see Section 3.6)</td><td> </td><td class="right"> o any stored Warning headers with warn-code 1xx (see Section 3.6)</td><td class="lineno" valign="top"></td></tr>
514	<tr><td><a name="diff0034" /></td></tr>
515	<tr><td class="lineno" valign="top"></td><td class="lblock"> MUST be <span class="delete">deleted from the stored response and the updated response.</span></td><td> </td><td class="rblock"> MUST be <span class="insert">deleted.</span></td><td class="lineno" valign="top"></td></tr>
516	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
517	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> o any stored Warning headers with warn-code 2xx MUST be retained in</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
518	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> the stored response and the updated response.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
519	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"></span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
520	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> o any headers provided in the new response MUST replace the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
521	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> corresponding headers from the stored response.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
522	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
523	<tr><td><a name="diff0035" /></td></tr>
524	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">If a header field-name in the new response matches more than one</span></td><td> </td><td class="rblock"> <span class="insert">o any</span> stored <span class="insert">Warning</span> headers <span class="insert">with warn-code 2xx</span> MUST be <span class="insert">retained.</span></td><td class="lineno" valign="top"></td></tr>
525	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> header in the stored response, all such</span> stored headers MUST be</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
526	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">replaced.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
527	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
528	<tr><td><a name="diff0036" /></td></tr>
529	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">The updated response can [[TODO-is-req: requirement?]] be used to</span></td><td> </td><td class="rblock"> <span class="insert">o any other headers provided</span> in the <span class="insert">new response MUST replace all</span></td><td class="lineno" valign="top"></td></tr>
530	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> replace the stored response</span> in <span class="delete">cache. In</span> the <span class="delete">case</span> of <span class="delete">a 206 response,</span></td><td> </td><td class="rblock"><span class="insert"> instances</span> of the <span class="insert">corresponding headers from the stored response.</span></td><td class="lineno" valign="top"></td></tr>
531	<tr><td class="lineno" valign="top"></td><td class="lblock"> the <span class="delete">combined entity-body MAY be stored.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
532	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
533	<tr><td><a name="diff0037" /></td></tr>
534	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">[[ISSUE-how-head: discuss how</span> to <span class="delete">handle HEAD updates]]</span></td><td> </td><td class="rblock"> <span class="insert">The updated response headers MUST be used</span> to <span class="insert">replace those of the</span></td><td class="lineno" valign="top"></td></tr>
535	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> stored response in cache (unless the stored response is removed from</span></td><td class="lineno" valign="top"></td></tr>
536	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> cache). In the case of a 206 response, the combined representation</span></td><td class="lineno" valign="top"></td></tr>
537	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> MAY be stored.</span></td><td class="lineno" valign="top"></td></tr>
538	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
539	<tr><td class="lineno" valign="top"></td><td class="left">3. Header Field Definitions</td><td> </td><td class="right">3. Header Field Definitions</td><td class="lineno" valign="top"></td></tr>
540	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
541	<tr><td class="lineno" valign="top"></td><td class="left"> This section defines the syntax and semantics of HTTP/1.1 header</td><td> </td><td class="right"> This section defines the syntax and semantics of HTTP/1.1 header</td><td class="lineno" valign="top"></td></tr>
542	<tr><td class="lineno" valign="top"></td><td class="left"> fields related to caching.</td><td> </td><td class="right"> fields related to caching.</td><td class="lineno" valign="top"></td></tr>
543	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
544	<tr><td><a name="diff0038" /></td></tr>
545	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">For entity-header fields, both sender and recipient refer to either</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
546	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> the client or the server, depending on who sends and who receives the</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
547	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> entity.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
548	<tr><td class="lineno" valign="top"></td><td class="lblock"> </td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
549	<tr><td class="lineno" valign="top"></td><td class="left">3.1. Age</td><td> </td><td class="right">3.1. Age</td><td class="lineno" valign="top"></td></tr>
550	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
551	<tr><td class="lineno" valign="top"></td><td class="left"> The "Age" response-header field conveys the sender's estimate of the</td><td> </td><td class="right"> The "Age" response-header field conveys the sender's estimate of the</td><td class="lineno" valign="top"></td></tr>
552	<tr><td class="lineno" valign="top"></td><td class="left"> amount of time since the response was generated or successfully</td><td> </td><td class="right"> amount of time since the response was generated or successfully</td><td class="lineno" valign="top"></td></tr>
553	<tr><td class="lineno" valign="top"></td><td class="left"> validated at the origin server. Age values are calculated as</td><td> </td><td class="right"> validated at the origin server. Age values are calculated as</td><td class="lineno" valign="top"></td></tr>
554	<tr><td class="lineno" valign="top"></td><td class="left"> specified in Section 2.3.2.</td><td> </td><td class="right"> specified in Section 2.3.2.</td><td class="lineno" valign="top"></td></tr>
555	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
556	<tr><td class="lineno" valign="top"></td><td class="left"> Age = "Age" ":" OWS Age-v</td><td> </td><td class="right"> Age = "Age" ":" OWS Age-v</td><td class="lineno" valign="top"></td></tr>
557	<tr><td class="lineno" valign="top"></td><td class="left"> Age-v = delta-seconds</td><td> </td><td class="right"> Age-v = delta-seconds</td><td class="lineno" valign="top"></td></tr>
558	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
559	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
560	<tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 18, line 18</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 18, line 4</em></th><td></td></tr>
561	<tr><td class="lineno" valign="top"></td><td class="left"> Age-v = delta-seconds</td><td> </td><td class="right"> Age-v = delta-seconds</td><td class="lineno" valign="top"></td></tr>
562	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
563	<tr><td class="lineno" valign="top"></td><td class="left"> Age field-values are non-negative integers, representing time in</td><td> </td><td class="right"> Age field-values are non-negative integers, representing time in</td><td class="lineno" valign="top"></td></tr>
564	<tr><td class="lineno" valign="top"></td><td class="left"> seconds.</td><td> </td><td class="right"> seconds.</td><td class="lineno" valign="top"></td></tr>
565	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
566	<tr><td class="lineno" valign="top"></td><td class="left"> delta-seconds = 1DIGIT</td><td> </td><td class="right"> delta-seconds = 1DIGIT</td><td class="lineno" valign="top"></td></tr>
567	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
568	<tr><td class="lineno" valign="top"></td><td class="left"> If a cache receives a value larger than the largest positive integer</td><td> </td><td class="right"> If a cache receives a value larger than the largest positive integer</td><td class="lineno" valign="top"></td></tr>
569	<tr><td class="lineno" valign="top"></td><td class="left"> it can represent, or if any of its age calculations overflows, it</td><td> </td><td class="right"> it can represent, or if any of its age calculations overflows, it</td><td class="lineno" valign="top"></td></tr>
570	<tr><td class="lineno" valign="top"></td><td class="left"> MUST transmit an Age header with a field-value of 2147483648 (2^31).</td><td> </td><td class="right"> MUST transmit an Age header with a field-value of 2147483648 (2^31).</td><td class="lineno" valign="top"></td></tr>
571	<tr><td><a name="diff0039" /></td></tr>
572	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> </span></td><td class="lineno" valign="top"></td></tr>
573	<tr><td class="lineno" valign="top"></td><td class="left"> Caches SHOULD use an arithmetic type of at least 31 bits of range.</td><td> </td><td class="right"> Caches SHOULD use an arithmetic type of at least 31 bits of range.</td><td class="lineno" valign="top"></td></tr>
574	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
575	<tr><td class="lineno" valign="top"></td><td class="left"> The presence of an Age header field in a response implies that a</td><td> </td><td class="right"> The presence of an Age header field in a response implies that a</td><td class="lineno" valign="top"></td></tr>
576	<tr><td class="lineno" valign="top"></td><td class="left"> response is not first-hand. However, the converse is not true, since</td><td> </td><td class="right"> response is not first-hand. However, the converse is not true, since</td><td class="lineno" valign="top"></td></tr>
577	<tr><td><a name="diff0040" /></td></tr>
578	<tr><td class="lineno" valign="top"></td><td class="lblock"> HTTP/1.0 caches m<span class="delete">ay</span> not implement the Age header field.</td><td> </td><td class="rblock"> HTTP/1.0 caches m<span class="insert">ight</span> not implement the Age header field.</td><td class="lineno" valign="top"></td></tr>
579	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
580	<tr><td class="lineno" valign="top"></td><td class="left">3.2. Cache-Control</td><td> </td><td class="right">3.2. Cache-Control</td><td class="lineno" valign="top"></td></tr>
581	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
582	<tr><td class="lineno" valign="top"></td><td class="left"> The "Cache-Control" general-header field is used to specify</td><td> </td><td class="right"> The "Cache-Control" general-header field is used to specify</td><td class="lineno" valign="top"></td></tr>
583	<tr><td class="lineno" valign="top"></td><td class="left"> directives for caches along the request/response chain. Such cache</td><td> </td><td class="right"> directives for caches along the request/response chain. Such cache</td><td class="lineno" valign="top"></td></tr>
584	<tr><td class="lineno" valign="top"></td><td class="left"> directives are unidirectional in that the presence of a directive in</td><td> </td><td class="right"> directives are unidirectional in that the presence of a directive in</td><td class="lineno" valign="top"></td></tr>
585	<tr><td class="lineno" valign="top"></td><td class="left"> a request does not imply that the same directive is to be given in</td><td> </td><td class="right"> a request does not imply that the same directive is to be given in</td><td class="lineno" valign="top"></td></tr>
586	<tr><td class="lineno" valign="top"></td><td class="left"> the response.</td><td> </td><td class="right"> the response.</td><td class="lineno" valign="top"></td></tr>
587	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
588	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP/1.1 caches MUST obey the requirements of the Cache-Control</td><td> </td><td class="right"> HTTP/1.1 caches MUST obey the requirements of the Cache-Control</td><td class="lineno" valign="top"></td></tr>
589	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
590	<tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 19, line 38</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 19, line 24</em></th><td></td></tr>
591	<tr><td class="lineno" valign="top"></td><td class="left"> store any part of either this request or any response to it. This</td><td> </td><td class="right"> store any part of either this request or any response to it. This</td><td class="lineno" valign="top"></td></tr>
592	<tr><td class="lineno" valign="top"></td><td class="left"> directive applies to both non-shared and shared caches. "MUST NOT</td><td> </td><td class="right"> directive applies to both non-shared and shared caches. "MUST NOT</td><td class="lineno" valign="top"></td></tr>
593	<tr><td class="lineno" valign="top"></td><td class="left"> store" in this context means that the cache MUST NOT intentionally</td><td> </td><td class="right"> store" in this context means that the cache MUST NOT intentionally</td><td class="lineno" valign="top"></td></tr>
594	<tr><td class="lineno" valign="top"></td><td class="left"> store the information in non-volatile storage, and MUST make a</td><td> </td><td class="right"> store the information in non-volatile storage, and MUST make a</td><td class="lineno" valign="top"></td></tr>
595	<tr><td class="lineno" valign="top"></td><td class="left"> best-effort attempt to remove the information from volatile</td><td> </td><td class="right"> best-effort attempt to remove the information from volatile</td><td class="lineno" valign="top"></td></tr>
596	<tr><td class="lineno" valign="top"></td><td class="left"> storage as promptly as possible after forwarding it.</td><td> </td><td class="right"> storage as promptly as possible after forwarding it.</td><td class="lineno" valign="top"></td></tr>
597	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
598	<tr><td class="lineno" valign="top"></td><td class="left"> This directive is NOT a reliable or sufficient mechanism for</td><td> </td><td class="right"> This directive is NOT a reliable or sufficient mechanism for</td><td class="lineno" valign="top"></td></tr>
599	<tr><td class="lineno" valign="top"></td><td class="left"> ensuring privacy. In particular, malicious or compromised caches</td><td> </td><td class="right"> ensuring privacy. In particular, malicious or compromised caches</td><td class="lineno" valign="top"></td></tr>
600	<tr><td class="lineno" valign="top"></td><td class="left"> might not recognize or obey this directive, and communications</td><td> </td><td class="right"> might not recognize or obey this directive, and communications</td><td class="lineno" valign="top"></td></tr>
601	<tr><td><a name="diff0041" /></td></tr>
602	<tr><td class="lineno" valign="top"></td><td class="lblock"> networks m<span class="delete">ay</span> be vulnerable to eavesdropping.</td><td> </td><td class="rblock"> networks m<span class="insert">ight</span> be vulnerable to eavesdropping.</td><td class="lineno" valign="top"></td></tr>
603	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
604	<tr><td class="lineno" valign="top"></td><td class="left"> max-age</td><td> </td><td class="right"> max-age</td><td class="lineno" valign="top"></td></tr>
605	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
606	<tr><td class="lineno" valign="top"></td><td class="left"> The max-age request directive indicates that the client is willing</td><td> </td><td class="right"> The max-age request directive indicates that the client is willing</td><td class="lineno" valign="top"></td></tr>
607	<tr><td class="lineno" valign="top"></td><td class="left"> to accept a response whose age is no greater than the specified</td><td> </td><td class="right"> to accept a response whose age is no greater than the specified</td><td class="lineno" valign="top"></td></tr>
608	<tr><td class="lineno" valign="top"></td><td class="left"> time in seconds. Unless the max-stale request directive is also</td><td> </td><td class="right"> time in seconds. Unless the max-stale request directive is also</td><td class="lineno" valign="top"></td></tr>
609	<tr><td class="lineno" valign="top"></td><td class="left"> present, the client is not willing to accept a stale response.</td><td> </td><td class="right"> present, the client is not willing to accept a stale response.</td><td class="lineno" valign="top"></td></tr>
610	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
611	<tr><td class="lineno" valign="top"></td><td class="left"> max-stale</td><td> </td><td class="right"> max-stale</td><td class="lineno" valign="top"></td></tr>
612	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
613	<tr><td class="lineno" valign="top"></td><td class="left"> The max-stale request directive indicates that the client is</td><td> </td><td class="right"> The max-stale request directive indicates that the client is</td><td class="lineno" valign="top"></td></tr>
614	<tr><td class="lineno" valign="top"></td><td class="left"> willing to accept a response that has exceeded its expiration</td><td> </td><td class="right"> willing to accept a response that has exceeded its expiration</td><td class="lineno" valign="top"></td></tr>
615	<tr><td class="lineno" valign="top"></td><td class="left"> time. If max-stale is assigned a value, then the client is</td><td> </td><td class="right"> time. If max-stale is assigned a value, then the client is</td><td class="lineno" valign="top"></td></tr>
616	<tr><td class="lineno" valign="top"></td><td class="left"> willing to accept a response that has exceeded its expiration time</td><td> </td><td class="right"> willing to accept a response that has exceeded its expiration time</td><td class="lineno" valign="top"></td></tr>
617	<tr><td class="lineno" valign="top"></td><td class="left"> by no more than the specified number of seconds. If no value is</td><td> </td><td class="right"> by no more than the specified number of seconds. If no value is</td><td class="lineno" valign="top"></td></tr>
618	<tr><td class="lineno" valign="top"></td><td class="left"> assigned to max-stale, then the client is willing to accept a</td><td> </td><td class="right"> assigned to max-stale, then the client is willing to accept a</td><td class="lineno" valign="top"></td></tr>
619	<tr><td><a name="diff0042" /></td></tr>
620	<tr><td class="lineno" valign="top"></td><td class="lblock"> stale response of any age. <span class="delete">[[TODO-staleness: of any staleness?</span></td><td> </td><td class="rblock"> stale response of any age.</td><td class="lineno" valign="top"></td></tr>
621	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> --mnot]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
622	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
623	<tr><td class="lineno" valign="top"></td><td class="left"> min-fresh</td><td> </td><td class="right"> min-fresh</td><td class="lineno" valign="top"></td></tr>
624	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
625	<tr><td class="lineno" valign="top"></td><td class="left"> The min-fresh request directive indicates that the client is</td><td> </td><td class="right"> The min-fresh request directive indicates that the client is</td><td class="lineno" valign="top"></td></tr>
626	<tr><td class="lineno" valign="top"></td><td class="left"> willing to accept a response whose freshness lifetime is no less</td><td> </td><td class="right"> willing to accept a response whose freshness lifetime is no less</td><td class="lineno" valign="top"></td></tr>
627	<tr><td class="lineno" valign="top"></td><td class="left"> than its current age plus the specified time in seconds. That is,</td><td> </td><td class="right"> than its current age plus the specified time in seconds. That is,</td><td class="lineno" valign="top"></td></tr>
628	<tr><td class="lineno" valign="top"></td><td class="left"> the client wants a response that will still be fresh for at least</td><td> </td><td class="right"> the client wants a response that will still be fresh for at least</td><td class="lineno" valign="top"></td></tr>
629	<tr><td class="lineno" valign="top"></td><td class="left"> the specified number of seconds.</td><td> </td><td class="right"> the specified number of seconds.</td><td class="lineno" valign="top"></td></tr>
630	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
631	<tr><td class="lineno" valign="top"></td><td class="left"> no-transform</td><td> </td><td class="right"> no-transform</td><td class="lineno" valign="top"></td></tr>
632	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
633	<tr><td class="lineno" valign="top"></td><td class="left"> The no-transform request directive indicates that an intermediate</td><td> </td><td class="right"> The no-transform request directive indicates that an intermediate</td><td class="lineno" valign="top"></td></tr>
634	<tr><td class="lineno" valign="top"></td><td class="left"> cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td> </td><td class="right"> cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td class="lineno" valign="top"></td></tr>
635	<tr><td><a name="diff0043" /></td></tr>
636	<tr><td class="lineno" valign="top"></td><td class="lblock"> or Content-Type request headers, nor the request <span class="delete">entity-body</span>.</td><td> </td><td class="rblock"> or Content-Type request headers, nor the request <span class="insert">representation</span>.</td><td class="lineno" valign="top"></td></tr>
637	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
638	<tr><td class="lineno" valign="top"></td><td class="left"> only-if-cached</td><td> </td><td class="right"> only-if-cached</td><td class="lineno" valign="top"></td></tr>
639	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
640	<tr><td class="lineno" valign="top"></td><td class="left"> The only-if-cached request directive indicates that the client</td><td> </td><td class="right"> The only-if-cached request directive indicates that the client</td><td class="lineno" valign="top"></td></tr>
641	<tr><td class="lineno" valign="top"></td><td class="left"> only wishes to return a stored response. If it receives this</td><td> </td><td class="right"> only wishes to return a stored response. If it receives this</td><td class="lineno" valign="top"></td></tr>
642	<tr><td class="lineno" valign="top"></td><td class="left"> directive, a cache SHOULD either respond using a stored response</td><td> </td><td class="right"> directive, a cache SHOULD either respond using a stored response</td><td class="lineno" valign="top"></td></tr>
643	<tr><td class="lineno" valign="top"></td><td class="left"> that is consistent with the other constraints of the request, or</td><td> </td><td class="right"> that is consistent with the other constraints of the request, or</td><td class="lineno" valign="top"></td></tr>
644	<tr><td><a name="diff0044" /></td></tr>
645	<tr><td class="lineno" valign="top"></td><td class="lblock"> respond with a 504 (Gateway Timeout) <span class="delete">status.</span> If a group of caches</td><td> </td><td class="rblock"> respond with a 504 (Gateway Timeout) <span class="insert">status code.</span> If a group of</td><td class="lineno" valign="top"></td></tr>
646	<tr><td class="lineno" valign="top"></td><td class="lblock"> is being operated as a unified system with good internal</td><td> </td><td class="rblock"> caches is being operated as a unified system with good internal</td><td class="lineno" valign="top"></td></tr>
647	<tr><td class="lineno" valign="top"></td><td class="left"> connectivity, such a request MAY be forwarded within that group of</td><td> </td><td class="right"> connectivity, such a request MAY be forwarded within that group of</td><td class="lineno" valign="top"></td></tr>
648	<tr><td class="lineno" valign="top"></td><td class="left"> caches.</td><td> </td><td class="right"> caches.</td><td class="lineno" valign="top"></td></tr>
649	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
650	<tr><td class="lineno" valign="top"></td><td class="left">3.2.2. Response Cache-Control Directives</td><td> </td><td class="right">3.2.2. Response Cache-Control Directives</td><td class="lineno" valign="top"></td></tr>
651	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
652	<tr><td class="lineno" valign="top"></td><td class="left"> cache-response-directive =</td><td> </td><td class="right"> cache-response-directive =</td><td class="lineno" valign="top"></td></tr>
653	<tr><td class="lineno" valign="top"></td><td class="left"> "public"</td><td> </td><td class="right"> "public"</td><td class="lineno" valign="top"></td></tr>
654	<tr><td class="lineno" valign="top"></td><td class="left"> / "private" [ "=" DQUOTE 1#field-name DQUOTE ]</td><td> </td><td class="right"> / "private" [ "=" DQUOTE 1#field-name DQUOTE ]</td><td class="lineno" valign="top"></td></tr>
655	<tr><td class="lineno" valign="top"></td><td class="left"> / "no-cache" [ "=" DQUOTE 1#field-name DQUOTE ]</td><td> </td><td class="right"> / "no-cache" [ "=" DQUOTE 1#field-name DQUOTE ]</td><td class="lineno" valign="top"></td></tr>
656	<tr><td class="lineno" valign="top"></td><td class="left"> / "no-store"</td><td> </td><td class="right"> / "no-store"</td><td class="lineno" valign="top"></td></tr>
657	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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659	<tr><td class="lineno" valign="top"></td><td class="left"> is intended for a single user and MUST NOT be stored by a shared</td><td> </td><td class="right"> is intended for a single user and MUST NOT be stored by a shared</td><td class="lineno" valign="top"></td></tr>
660	<tr><td class="lineno" valign="top"></td><td class="left"> cache. A private (non-shared) cache MAY store the response.</td><td> </td><td class="right"> cache. A private (non-shared) cache MAY store the response.</td><td class="lineno" valign="top"></td></tr>
661	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
662	<tr><td class="lineno" valign="top"></td><td class="left"> If the private response directive specifies one or more field-</td><td> </td><td class="right"> If the private response directive specifies one or more field-</td><td class="lineno" valign="top"></td></tr>
663	<tr><td class="lineno" valign="top"></td><td class="left"> names, this requirement is limited to the field-values associated</td><td> </td><td class="right"> names, this requirement is limited to the field-values associated</td><td class="lineno" valign="top"></td></tr>
664	<tr><td class="lineno" valign="top"></td><td class="left"> with the listed response headers. That is, the specified field-</td><td> </td><td class="right"> with the listed response headers. That is, the specified field-</td><td class="lineno" valign="top"></td></tr>
665	<tr><td class="lineno" valign="top"></td><td class="left"> names(s) MUST NOT be stored by a shared cache, whereas the</td><td> </td><td class="right"> names(s) MUST NOT be stored by a shared cache, whereas the</td><td class="lineno" valign="top"></td></tr>
666	<tr><td class="lineno" valign="top"></td><td class="left"> remainder of the response message MAY be.</td><td> </td><td class="right"> remainder of the response message MAY be.</td><td class="lineno" valign="top"></td></tr>
667	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
668	<tr><td class="lineno" valign="top"></td><td class="left"> Note: This usage of the word private only controls where the</td><td> </td><td class="right"> Note: This usage of the word private only controls where the</td><td class="lineno" valign="top"></td></tr>
669	<tr><td><a name="diff0045" /></td></tr>
670	<tr><td class="lineno" valign="top"></td><td class="lblock"> response <span class="delete">may be stored, and</span> cannot ensure the privacy of the</td><td> </td><td class="rblock"> response <span class="insert">can be stored; it</span> cannot ensure the privacy of the</td><td class="lineno" valign="top"></td></tr>
671	<tr><td class="lineno" valign="top"></td><td class="left"> message content. Also, private response directives with field-</td><td> </td><td class="right"> message content. Also, private response directives with field-</td><td class="lineno" valign="top"></td></tr>
672	<tr><td class="lineno" valign="top"></td><td class="left"> names are often handled by implementations as if an unqualified</td><td> </td><td class="right"> names are often handled by implementations as if an unqualified</td><td class="lineno" valign="top"></td></tr>
673	<tr><td class="lineno" valign="top"></td><td class="left"> private directive was received; i.e., the special handling for the</td><td> </td><td class="right"> private directive was received; i.e., the special handling for the</td><td class="lineno" valign="top"></td></tr>
674	<tr><td class="lineno" valign="top"></td><td class="left"> qualified form is not widely implemented.</td><td> </td><td class="right"> qualified form is not widely implemented.</td><td class="lineno" valign="top"></td></tr>
675	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
676	<tr><td class="lineno" valign="top"></td><td class="left"> no-cache</td><td> </td><td class="right"> no-cache</td><td class="lineno" valign="top"></td></tr>
677	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
678	<tr><td class="lineno" valign="top"></td><td class="left"> The no-cache response directive indicates that the response MUST</td><td> </td><td class="right"> The no-cache response directive indicates that the response MUST</td><td class="lineno" valign="top"></td></tr>
679	<tr><td class="lineno" valign="top"></td><td class="left"> NOT be used to satisfy a subsequent request without successful</td><td> </td><td class="right"> NOT be used to satisfy a subsequent request without successful</td><td class="lineno" valign="top"></td></tr>
680	<tr><td class="lineno" valign="top"></td><td class="left"> validation on the origin server. This allows an origin server to</td><td> </td><td class="right"> validation on the origin server. This allows an origin server to</td><td class="lineno" valign="top"></td></tr>
681	<tr><td><a name="diff0046" /></td></tr>
682	<tr><td class="lineno" valign="top"></td><td class="lblock"> prevent <span class="delete">caching</span> even by caches that have been configured to return</td><td> </td><td class="rblock"> prevent <span class="insert">a cache from using it to satisfy a request without</span></td><td class="lineno" valign="top"></td></tr>
683	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> contacting it,</span> even by caches that have been configured to return</td><td class="lineno" valign="top"></td></tr>
684	<tr><td class="lineno" valign="top"></td><td class="left"> stale responses.</td><td> </td><td class="right"> stale responses.</td><td class="lineno" valign="top"></td></tr>
685	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
686	<tr><td class="lineno" valign="top"></td><td class="left"> If the no-cache response directive specifies one or more field-</td><td> </td><td class="right"> If the no-cache response directive specifies one or more field-</td><td class="lineno" valign="top"></td></tr>
687	<tr><td class="lineno" valign="top"></td><td class="left"> names, this requirement is limited to the field-values associated</td><td> </td><td class="right"> names, this requirement is limited to the field-values associated</td><td class="lineno" valign="top"></td></tr>
688	<tr><td class="lineno" valign="top"></td><td class="left"> with the listed response headers. That is, the specified field-</td><td> </td><td class="right"> with the listed response headers. That is, the specified field-</td><td class="lineno" valign="top"></td></tr>
689	<tr><td class="lineno" valign="top"></td><td class="left"> name(s) MUST NOT be sent in the response to a subsequent request</td><td> </td><td class="right"> name(s) MUST NOT be sent in the response to a subsequent request</td><td class="lineno" valign="top"></td></tr>
690	<tr><td class="lineno" valign="top"></td><td class="left"> without successful validation on the origin server. This allows</td><td> </td><td class="right"> without successful validation on the origin server. This allows</td><td class="lineno" valign="top"></td></tr>
691	<tr><td class="lineno" valign="top"></td><td class="left"> an origin server to prevent the re-use of certain header fields in</td><td> </td><td class="right"> an origin server to prevent the re-use of certain header fields in</td><td class="lineno" valign="top"></td></tr>
692	<tr><td class="lineno" valign="top"></td><td class="left"> a response, while still allowing caching of the rest of the</td><td> </td><td class="right"> a response, while still allowing caching of the rest of the</td><td class="lineno" valign="top"></td></tr>
693	<tr><td class="lineno" valign="top"></td><td class="left"> response.</td><td> </td><td class="right"> response.</td><td class="lineno" valign="top"></td></tr>
694	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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696	<tr><td class="lineno" valign="top"></td><td class="left"> store any part of either the immediate request or response. This</td><td> </td><td class="right"> store any part of either the immediate request or response. This</td><td class="lineno" valign="top"></td></tr>
697	<tr><td class="lineno" valign="top"></td><td class="left"> directive applies to both non-shared and shared caches. "MUST NOT</td><td> </td><td class="right"> directive applies to both non-shared and shared caches. "MUST NOT</td><td class="lineno" valign="top"></td></tr>
698	<tr><td class="lineno" valign="top"></td><td class="left"> store" in this context means that the cache MUST NOT intentionally</td><td> </td><td class="right"> store" in this context means that the cache MUST NOT intentionally</td><td class="lineno" valign="top"></td></tr>
699	<tr><td class="lineno" valign="top"></td><td class="left"> store the information in non-volatile storage, and MUST make a</td><td> </td><td class="right"> store the information in non-volatile storage, and MUST make a</td><td class="lineno" valign="top"></td></tr>
700	<tr><td class="lineno" valign="top"></td><td class="left"> best-effort attempt to remove the information from volatile</td><td> </td><td class="right"> best-effort attempt to remove the information from volatile</td><td class="lineno" valign="top"></td></tr>
701	<tr><td class="lineno" valign="top"></td><td class="left"> storage as promptly as possible after forwarding it.</td><td> </td><td class="right"> storage as promptly as possible after forwarding it.</td><td class="lineno" valign="top"></td></tr>
702	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
703	<tr><td class="lineno" valign="top"></td><td class="left"> This directive is NOT a reliable or sufficient mechanism for</td><td> </td><td class="right"> This directive is NOT a reliable or sufficient mechanism for</td><td class="lineno" valign="top"></td></tr>
704	<tr><td class="lineno" valign="top"></td><td class="left"> ensuring privacy. In particular, malicious or compromised caches</td><td> </td><td class="right"> ensuring privacy. In particular, malicious or compromised caches</td><td class="lineno" valign="top"></td></tr>
705	<tr><td class="lineno" valign="top"></td><td class="left"> might not recognize or obey this directive, and communications</td><td> </td><td class="right"> might not recognize or obey this directive, and communications</td><td class="lineno" valign="top"></td></tr>
706	<tr><td><a name="diff0047" /></td></tr>
707	<tr><td class="lineno" valign="top"></td><td class="lblock"> networks m<span class="delete">ay</span> be vulnerable to eavesdropping.</td><td> </td><td class="rblock"> networks m<span class="insert">ight</span> be vulnerable to eavesdropping.</td><td class="lineno" valign="top"></td></tr>
708	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
709	<tr><td class="lineno" valign="top"></td><td class="left"> must-revalidate</td><td> </td><td class="right"> must-revalidate</td><td class="lineno" valign="top"></td></tr>
710	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
711	<tr><td class="lineno" valign="top"></td><td class="left"> The must-revalidate response directive indicates that once it has</td><td> </td><td class="right"> The must-revalidate response directive indicates that once it has</td><td class="lineno" valign="top"></td></tr>
712	<tr><td class="lineno" valign="top"></td><td class="left"> become stale, the response MUST NOT be used to satisfy subsequent</td><td> </td><td class="right"> become stale, the response MUST NOT be used to satisfy subsequent</td><td class="lineno" valign="top"></td></tr>
713	<tr><td class="lineno" valign="top"></td><td class="left"> requests without successful validation on the origin server.</td><td> </td><td class="right"> requests without successful validation on the origin server.</td><td class="lineno" valign="top"></td></tr>
714	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
715	<tr><td class="lineno" valign="top"></td><td class="left"> The must-revalidate directive is necessary to support reliable</td><td> </td><td class="right"> The must-revalidate directive is necessary to support reliable</td><td class="lineno" valign="top"></td></tr>
716	<tr><td class="lineno" valign="top"></td><td class="left"> operation for certain protocol features. In all circumstances an</td><td> </td><td class="right"> operation for certain protocol features. In all circumstances an</td><td class="lineno" valign="top"></td></tr>
717	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP/1.1 cache MUST obey the must-revalidate directive; in</td><td> </td><td class="right"> HTTP/1.1 cache MUST obey the must-revalidate directive; in</td><td class="lineno" valign="top"></td></tr>
718	<tr><td class="lineno" valign="top"></td><td class="left"> particular, if the cache cannot reach the origin server for any</td><td> </td><td class="right"> particular, if the cache cannot reach the origin server for any</td><td class="lineno" valign="top"></td></tr>
719	<tr><td class="lineno" valign="top"></td><td class="left"> reason, it MUST generate a 504 (Gateway Timeout) response.</td><td> </td><td class="right"> reason, it MUST generate a 504 (Gateway Timeout) response.</td><td class="lineno" valign="top"></td></tr>
720	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
721	<tr><td class="lineno" valign="top"></td><td class="left"> Servers SHOULD send the must-revalidate directive if and only if</td><td> </td><td class="right"> Servers SHOULD send the must-revalidate directive if and only if</td><td class="lineno" valign="top"></td></tr>
722	<tr><td><a name="diff0048" /></td></tr>
723	<tr><td class="lineno" valign="top"></td><td class="lblock"> failure to validate a request on the <span class="delete">entity</span> could result in</td><td> </td><td class="rblock"> failure to validate a request on the <span class="insert">representation</span> could result</td><td class="lineno" valign="top"></td></tr>
724	<tr><td class="lineno" valign="top"></td><td class="lblock"> incorrect operation, such as a silently unexecuted financial</td><td> </td><td class="rblock"> in incorrect operation, such as a silently unexecuted financial</td><td class="lineno" valign="top"></td></tr>
725	<tr><td class="lineno" valign="top"></td><td class="left"> transaction.</td><td> </td><td class="right"> transaction.</td><td class="lineno" valign="top"></td></tr>
726	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
727	<tr><td class="lineno" valign="top"></td><td class="left"> proxy-revalidate</td><td> </td><td class="right"> proxy-revalidate</td><td class="lineno" valign="top"></td></tr>
728	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
729	<tr><td class="lineno" valign="top"></td><td class="left"> The proxy-revalidate response directive has the same meaning as</td><td> </td><td class="right"> The proxy-revalidate response directive has the same meaning as</td><td class="lineno" valign="top"></td></tr>
730	<tr><td class="lineno" valign="top"></td><td class="left"> the must-revalidate response directive, except that it does not</td><td> </td><td class="right"> the must-revalidate response directive, except that it does not</td><td class="lineno" valign="top"></td></tr>
731	<tr><td class="lineno" valign="top"></td><td class="left"> apply to non-shared caches.</td><td> </td><td class="right"> apply to non-shared caches.</td><td class="lineno" valign="top"></td></tr>
732	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
733	<tr><td class="lineno" valign="top"></td><td class="left"> max-age</td><td> </td><td class="right"> max-age</td><td class="lineno" valign="top"></td></tr>
734	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
735	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
736	<tr bgcolor="gray" ><td></td><th><a name="part-l14" /><small>skipping to change at</small><em> page 23, line 12</em></th><th> </th><th><a name="part-r14" /><small>skipping to change at</small><em> page 22, line 46</em></th><td></td></tr>
737	<tr><td class="lineno" valign="top"></td><td class="left"> The s-maxage response directive indicates that, in shared caches,</td><td> </td><td class="right"> The s-maxage response directive indicates that, in shared caches,</td><td class="lineno" valign="top"></td></tr>
738	<tr><td class="lineno" valign="top"></td><td class="left"> the maximum age specified by this directive overrides the maximum</td><td> </td><td class="right"> the maximum age specified by this directive overrides the maximum</td><td class="lineno" valign="top"></td></tr>
739	<tr><td class="lineno" valign="top"></td><td class="left"> age specified by either the max-age directive or the Expires</td><td> </td><td class="right"> age specified by either the max-age directive or the Expires</td><td class="lineno" valign="top"></td></tr>
740	<tr><td class="lineno" valign="top"></td><td class="left"> header. The s-maxage directive also implies the semantics of the</td><td> </td><td class="right"> header. The s-maxage directive also implies the semantics of the</td><td class="lineno" valign="top"></td></tr>
741	<tr><td class="lineno" valign="top"></td><td class="left"> proxy-revalidate response directive.</td><td> </td><td class="right"> proxy-revalidate response directive.</td><td class="lineno" valign="top"></td></tr>
742	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
743	<tr><td class="lineno" valign="top"></td><td class="left"> no-transform</td><td> </td><td class="right"> no-transform</td><td class="lineno" valign="top"></td></tr>
744	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
745	<tr><td class="lineno" valign="top"></td><td class="left"> The no-transform response directive indicates that an intermediate</td><td> </td><td class="right"> The no-transform response directive indicates that an intermediate</td><td class="lineno" valign="top"></td></tr>
746	<tr><td class="lineno" valign="top"></td><td class="left"> cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td> </td><td class="right"> cache or proxy MUST NOT change the Content-Encoding, Content-Range</td><td class="lineno" valign="top"></td></tr>
747	<tr><td><a name="diff0049" /></td></tr>
748	<tr><td class="lineno" valign="top"></td><td class="lblock"> or Content-Type response headers, nor the response <span class="delete">entity-body</span>.</td><td> </td><td class="rblock"> or Content-Type response headers, nor the response <span class="insert">representation</span>.</td><td class="lineno" valign="top"></td></tr>
749	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
750	<tr><td class="lineno" valign="top"></td><td class="left">3.2.3. Cache Control Extensions</td><td> </td><td class="right">3.2.3. Cache Control Extensions</td><td class="lineno" valign="top"></td></tr>
751	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
752	<tr><td class="lineno" valign="top"></td><td class="left"> The Cache-Control header field can be extended through the use of one</td><td> </td><td class="right"> The Cache-Control header field can be extended through the use of one</td><td class="lineno" valign="top"></td></tr>
753	<tr><td class="lineno" valign="top"></td><td class="left"> or more cache-extension tokens, each with an optional value.</td><td> </td><td class="right"> or more cache-extension tokens, each with an optional value.</td><td class="lineno" valign="top"></td></tr>
754	<tr><td class="lineno" valign="top"></td><td class="left"> Informational extensions (those that do not require a change in cache</td><td> </td><td class="right"> Informational extensions (those that do not require a change in cache</td><td class="lineno" valign="top"></td></tr>
755	<tr><td class="lineno" valign="top"></td><td class="left"> behavior) can be added without changing the semantics of other</td><td> </td><td class="right"> behavior) can be added without changing the semantics of other</td><td class="lineno" valign="top"></td></tr>
756	<tr><td class="lineno" valign="top"></td><td class="left"> directives. Behavioral extensions are designed to work by acting as</td><td> </td><td class="right"> directives. Behavioral extensions are designed to work by acting as</td><td class="lineno" valign="top"></td></tr>
757	<tr><td class="lineno" valign="top"></td><td class="left"> modifiers to the existing base of cache directives. Both the new</td><td> </td><td class="right"> modifiers to the existing base of cache directives. Both the new</td><td class="lineno" valign="top"></td></tr>
758	<tr><td class="lineno" valign="top"></td><td class="left"> directive and the standard directive are supplied, such that</td><td> </td><td class="right"> directive and the standard directive are supplied, such that</td><td class="lineno" valign="top"></td></tr>
759	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
760	<tr bgcolor="gray" ><td></td><th><a name="part-l15" /><small>skipping to change at</small><em> page 24, line 25</em></th><th> </th><th><a name="part-r15" /><small>skipping to change at</small><em> page 24, line 10</em></th><td></td></tr>
761	<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>
762	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
763	<tr><td class="lineno" valign="top"></td><td class="left"> Values to be added to this name space are subject to IETF review</td><td> </td><td class="right"> Values to be added to this name space are subject to IETF review</td><td class="lineno" valign="top"></td></tr>
764	<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>
765	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
766	<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>
767	<tr><td class="lineno" valign="top"></td><td class="left"> <http://www.iana.org/assignments/http-cache-directives>.</td><td> </td><td class="right"> <http://www.iana.org/assignments/http-cache-directives>.</td><td class="lineno" valign="top"></td></tr>
768	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
769	<tr><td class="lineno" valign="top"></td><td class="left">3.3. Expires</td><td> </td><td class="right">3.3. Expires</td><td class="lineno" valign="top"></td></tr>
770	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
771	<tr><td><a name="diff0050" /></td></tr>
772	<tr><td class="lineno" valign="top"></td><td class="lblock"> The "Expires" <span class="delete">entity-</span>header field gives the date/time after which the</td><td> </td><td class="rblock"> The "Expires" header field gives the date/time after which the</td><td class="lineno" valign="top"></td></tr>
773	<tr><td class="lineno" valign="top"></td><td class="left"> response is considered stale. See Section 2.3 for further discussion</td><td> </td><td class="right"> response is considered stale. See Section 2.3 for further discussion</td><td class="lineno" valign="top"></td></tr>
774	<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>
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 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>
777	<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>
778	<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>
779	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
780	<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>
781	<tr><td class="lineno" valign="top"></td><td class="left"> in Section 6.1 of [Part1]; it MUST be sent in rfc1123-date format.</td><td> </td><td class="right"> in Section 6.1 of [Part1]; it MUST be sent in rfc1123-date format.</td><td class="lineno" valign="top"></td></tr>
782	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
783	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
784	<tr bgcolor="gray" ><td></td><th><a name="part-l16" /><small>skipping to change at</small><em> page 26, line 25</em></th><th> </th><th><a name="part-r16" /><small>skipping to change at</small><em> page 26, line 9</em></th><td></td></tr>
785	<tr><td class="lineno" valign="top"></td><td class="left"> resource. A server MAY include a Vary header field with a non-</td><td> </td><td class="right"> resource. A server MAY include a Vary header field with a non-</td><td class="lineno" valign="top"></td></tr>
786	<tr><td class="lineno" valign="top"></td><td class="left"> cacheable response that is subject to server-driven negotiation,</td><td> </td><td class="right"> cacheable response that is subject to server-driven negotiation,</td><td class="lineno" valign="top"></td></tr>
787	<tr><td class="lineno" valign="top"></td><td class="left"> since this might provide the user agent with useful information about</td><td> </td><td class="right"> since this might provide the user agent with useful information about</td><td class="lineno" valign="top"></td></tr>
788	<tr><td class="lineno" valign="top"></td><td class="left"> the dimensions over which the response varies at the time of the</td><td> </td><td class="right"> the dimensions over which the response varies at the time of the</td><td class="lineno" valign="top"></td></tr>
789	<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>
790	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
791	<tr><td class="lineno" valign="top"></td><td class="left"> A Vary field value of "" signals that unspecified parameters not</td><td> </td><td class="right"> A Vary field value of "" signals that unspecified parameters not</td><td class="lineno" valign="top"></td></tr>
792	<tr><td class="lineno" valign="top"></td><td class="left"> limited to the request-headers (e.g., the network address of the</td><td> </td><td class="right"> limited to the request-headers (e.g., the network address of the</td><td class="lineno" valign="top"></td></tr>
793	<tr><td class="lineno" valign="top"></td><td class="left"> client), play a role in the selection of the response representation;</td><td> </td><td class="right"> client), play a role in the selection of the response representation;</td><td class="lineno" valign="top"></td></tr>
794	<tr><td class="lineno" valign="top"></td><td class="left"> therefore, a cache cannot determine whether this response is</td><td> </td><td class="right"> therefore, a cache cannot determine whether this response is</td><td class="lineno" valign="top"></td></tr>
795	<tr><td><a name="diff0051" /></td></tr>
796	<tr><td class="lineno" valign="top"></td><td class="lblock"> appropriate. The "" value MUST NOT be generated by a proxy <span class="delete">server;</span></td><td> </td><td class="rblock"> appropriate. The "" value MUST NOT be generated by a proxy server.</td><td class="lineno" valign="top"></td></tr>
797	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> it may only be generated by an origin</span> server.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
798	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
799	<tr><td class="lineno" valign="top"></td><td class="left"> The field-names given are not limited to the set of standard request-</td><td> </td><td class="right"> The field-names given are not limited to the set of standard request-</td><td class="lineno" valign="top"></td></tr>
800	<tr><td class="lineno" valign="top"></td><td class="left"> header fields defined by this specification. Field names are case-</td><td> </td><td class="right"> header fields defined by this specification. Field names are case-</td><td class="lineno" valign="top"></td></tr>
801	<tr><td class="lineno" valign="top"></td><td class="left"> insensitive.</td><td> </td><td class="right"> insensitive.</td><td class="lineno" valign="top"></td></tr>
802	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
803	<tr><td class="lineno" valign="top"></td><td class="left">3.6. Warning</td><td> </td><td class="right">3.6. Warning</td><td class="lineno" valign="top"></td></tr>
804	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
805	<tr><td class="lineno" valign="top"></td><td class="left"> The "Warning" general-header field is used to carry additional</td><td> </td><td class="right"> The "Warning" general-header field is used to carry additional</td><td class="lineno" valign="top"></td></tr>
806	<tr><td class="lineno" valign="top"></td><td class="left"> information about the status or transformation of a message that</td><td> </td><td class="right"> information about the status or transformation of a message that</td><td class="lineno" valign="top"></td></tr>
807	<tr><td class="lineno" valign="top"></td><td class="left"> might not be reflected in the message. This information is typically</td><td> </td><td class="right"> might not be reflected in the message. This information is typically</td><td class="lineno" valign="top"></td></tr>
808	<tr><td class="lineno" valign="top"></td><td class="left"> used to warn about possible incorrectness introduced by caching</td><td> </td><td class="right"> used to warn about possible incorrectness introduced by caching</td><td class="lineno" valign="top"></td></tr>
809	<tr><td><a name="diff0052" /></td></tr>
810	<tr><td class="lineno" valign="top"></td><td class="lblock"> operations or transformations applied to the <span class="delete">entity body</span> of the</td><td> </td><td class="rblock"> operations or transformations applied to the <span class="insert">payload</span> of the message.</td><td class="lineno" valign="top"></td></tr>
811	<tr><td class="lineno" valign="top"></td><td class="lblock"> message.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
812	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
813	<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>
814	<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>
815	<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>
816	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
817	<tr><td class="lineno" valign="top"></td><td class="left"> Warning headers can in general be applied to any message, however</td><td> </td><td class="right"> Warning headers can in general be applied to any message, however</td><td class="lineno" valign="top"></td></tr>
818	<tr><td class="lineno" valign="top"></td><td class="left"> some warn-codes are specific to caches and can only be applied to</td><td> </td><td class="right"> some warn-codes are specific to caches and can only be applied to</td><td class="lineno" valign="top"></td></tr>
819	<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>
820	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
821	<tr><td class="lineno" valign="top"></td><td class="left"> Warning = "Warning" ":" OWS Warning-v</td><td> </td><td class="right"> Warning = "Warning" ":" OWS Warning-v</td><td class="lineno" valign="top"></td></tr>
822	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
823	<tr bgcolor="gray" ><td></td><th><a name="part-l17" /><small>skipping to change at</small><em> page 27, line 38</em></th><th> </th><th><a name="part-r17" /><small>skipping to change at</small><em> page 27, line 15</em></th><td></td></tr>
824	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
825	<tr><td class="lineno" valign="top"></td><td class="left"> Warnings are assigned three digit warn-codes. The first digit</td><td> </td><td class="right"> Warnings are assigned three digit warn-codes. The first digit</td><td class="lineno" valign="top"></td></tr>
826	<tr><td class="lineno" valign="top"></td><td class="left"> indicates whether the Warning is required to be deleted from a stored</td><td> </td><td class="right"> indicates whether the Warning is required to be deleted from a stored</td><td class="lineno" valign="top"></td></tr>
827	<tr><td class="lineno" valign="top"></td><td class="left"> response after validation:</td><td> </td><td class="right"> response after validation:</td><td class="lineno" valign="top"></td></tr>
828	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
829	<tr><td class="lineno" valign="top"></td><td class="left"> o 1xx Warnings describe the freshness or validation status of the</td><td> </td><td class="right"> o 1xx Warnings describe the freshness or validation status of the</td><td class="lineno" valign="top"></td></tr>
830	<tr><td class="lineno" valign="top"></td><td class="left"> response, and so MUST be deleted by caches after validation. They</td><td> </td><td class="right"> response, and so MUST be deleted by caches after validation. They</td><td class="lineno" valign="top"></td></tr>
831	<tr><td class="lineno" valign="top"></td><td class="left"> can only be generated by a cache when validating a cached entry,</td><td> </td><td class="right"> can only be generated by a cache when validating a cached entry,</td><td class="lineno" valign="top"></td></tr>
832	<tr><td class="lineno" valign="top"></td><td class="left"> and MUST NOT be generated in any other situation.</td><td> </td><td class="right"> and MUST NOT be generated in any other situation.</td><td class="lineno" valign="top"></td></tr>
833	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
834	<tr><td><a name="diff0053" /></td></tr>
835	<tr><td class="lineno" valign="top"></td><td class="lblock"> o 2xx Warnings describe some aspect of the <span class="delete">entity body or entity</span></td><td> </td><td class="rblock"> o 2xx Warnings describe some aspect of the <span class="insert">representation</span> that is</td><td class="lineno" valign="top"></td></tr>
836	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> headers</span> that is not rectified by a validation (for example, a</td><td> </td><td class="rblock"> not rectified by a validation (for example, a lossy compression of</td><td class="lineno" valign="top"></td></tr>
837	<tr><td class="lineno" valign="top"></td><td class="lblock"> lossy compression of the <span class="delete">entity bodies)</span> and MUST NOT be deleted by</td><td> </td><td class="rblock"> the <span class="insert">representation)</span> and MUST NOT be deleted by caches after</td><td class="lineno" valign="top"></td></tr>
838	<tr><td class="lineno" valign="top"></td><td class="lblock"> caches after validation, unless a full response is returned, in</td><td> </td><td class="rblock"> validation, unless a full response is returned, in which case they</td><td class="lineno" valign="top"></td></tr>
839	<tr><td class="lineno" valign="top"></td><td class="lblock"> which case they MUST be.</td><td> </td><td class="rblock"> MUST be.</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"> If an implementation sends a message with one or more Warning headers</td><td> </td><td class="right"> If an implementation sends a message with one or more Warning headers</td><td class="lineno" valign="top"></td></tr>
842	<tr><td class="lineno" valign="top"></td><td class="left"> to a receiver whose version is HTTP/1.0 or lower, then the sender</td><td> </td><td class="right"> to a receiver whose version is HTTP/1.0 or lower, then the sender</td><td class="lineno" valign="top"></td></tr>
843	<tr><td class="lineno" valign="top"></td><td class="left"> MUST include in each warning-value a warn-date that matches the Date</td><td> </td><td class="right"> MUST include in each warning-value a warn-date that matches the Date</td><td class="lineno" valign="top"></td></tr>
844	<tr><td class="lineno" valign="top"></td><td class="left"> header in the message.</td><td> </td><td class="right"> header in the message.</td><td class="lineno" valign="top"></td></tr>
845	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
846	<tr><td class="lineno" valign="top"></td><td class="left"> If an implementation receives a message with a warning-value that</td><td> </td><td class="right"> If an implementation receives a message with a warning-value that</td><td class="lineno" valign="top"></td></tr>
847	<tr><td class="lineno" valign="top"></td><td class="left"> includes a warn-date, and that warn-date is different from the Date</td><td> </td><td class="right"> includes a warn-date, and that warn-date is different from the Date</td><td class="lineno" valign="top"></td></tr>
848	<tr><td class="lineno" valign="top"></td><td class="left"> value in the response, then that warning-value MUST be deleted from</td><td> </td><td class="right"> value in the response, then that warning-value MUST be deleted from</td><td class="lineno" valign="top"></td></tr>
849	<tr><td class="lineno" valign="top"></td><td class="left"> the message before storing, forwarding, or using it. (preventing the</td><td> </td><td class="right"> the message before storing, forwarding, or using it. (preventing the</td><td class="lineno" valign="top"></td></tr>
850	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
851	<tr bgcolor="gray" ><td></td><th><a name="part-l18" /><small>skipping to change at</small><em> page 28, line 41</em></th><th> </th><th><a name="part-r18" /><small>skipping to change at</small><em> page 28, line 20</em></th><td></td></tr>
852	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
853	<tr><td class="lineno" valign="top"></td><td class="left"> 199 Miscellaneous warning</td><td> </td><td class="right"> 199 Miscellaneous warning</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"> The warning text can include arbitrary information to be presented</td><td> </td><td class="right"> The warning text can include arbitrary information to be presented</td><td class="lineno" valign="top"></td></tr>
856	<tr><td class="lineno" valign="top"></td><td class="left"> to a human user, or logged. A system receiving this warning MUST</td><td> </td><td class="right"> to a human user, or logged. A system receiving this warning MUST</td><td class="lineno" valign="top"></td></tr>
857	<tr><td class="lineno" valign="top"></td><td class="left"> NOT take any automated action, besides presenting the warning to</td><td> </td><td class="right"> NOT take any automated action, besides presenting the warning to</td><td class="lineno" valign="top"></td></tr>
858	<tr><td class="lineno" valign="top"></td><td class="left"> the user.</td><td> </td><td class="right"> the user.</td><td class="lineno" valign="top"></td></tr>
859	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
860	<tr><td class="lineno" valign="top"></td><td class="left"> 214 Transformation applied</td><td> </td><td class="right"> 214 Transformation applied</td><td class="lineno" valign="top"></td></tr>
861	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
862	<tr><td><a name="diff0054" /></td></tr>
863	<tr><td class="lineno" valign="top"></td><td class="lblock"> MUST be added by an intermediate <span class="delete">cache or</span> proxy if it applies any</td><td> </td><td class="rblock"> MUST be added by an intermediate proxy if it applies any</td><td class="lineno" valign="top"></td></tr>
864	<tr><td class="lineno" valign="top"></td><td class="lblock"> transformation <span class="delete">changing</span> the <span class="delete">content-coding (as specified in the</span></td><td> </td><td class="rblock"> transformation <span class="insert">to</span> the <span class="insert">representation, such as changing</span> the</td><td class="lineno" valign="top"></td></tr>
865	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Content-Encoding header) or media-type (as specified in the</span></td><td> </td><td class="rblock"> <span class="insert">content-coding, media-type,</span> or <span class="insert">modifying</span> the <span class="insert">representation data,</span></td><td class="lineno" valign="top"></td></tr>
866	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> Content-Type header) of</span> the <span class="delete">response,</span> or the <span class="delete">entity-body of the</span></td><td> </td><td class="rblock"> unless this Warning code already appears in the response.</td><td class="lineno" valign="top"></td></tr>
867	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> response,</span> unless this Warning code already appears in the</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
868	<tr><td class="lineno" valign="top"></td><td class="lblock"> response.</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
869	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
870	<tr><td class="lineno" valign="top"></td><td class="left"> 299 Miscellaneous persistent warning</td><td> </td><td class="right"> 299 Miscellaneous persistent warning</td><td class="lineno" valign="top"></td></tr>
871	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
872	<tr><td class="lineno" valign="top"></td><td class="left"> The warning text can include arbitrary information to be presented</td><td> </td><td class="right"> The warning text can include arbitrary information to be presented</td><td class="lineno" valign="top"></td></tr>
873	<tr><td class="lineno" valign="top"></td><td class="left"> to a human user, or logged. A system receiving this warning MUST</td><td> </td><td class="right"> to a human user, or logged. A system receiving this warning MUST</td><td class="lineno" valign="top"></td></tr>
874	<tr><td class="lineno" valign="top"></td><td class="left"> NOT take any automated action.</td><td> </td><td class="right"> NOT take any automated action.</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">4. History Lists</td><td> </td><td class="right">4. History Lists</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 class="lineno" valign="top"></td><td class="left"> User agents often have history mechanisms, such as "Back" buttons and</td><td> </td><td class="right"> User agents often have history mechanisms, such as "Back" buttons and</td><td class="lineno" valign="top"></td></tr>
879	<tr><td><a name="diff0055" /></td></tr>
880	<tr><td class="lineno" valign="top"></td><td class="lblock"> history lists, that can be used to redisplay <span class="delete">an entity</span> retrieved</td><td> </td><td class="rblock"> history lists, that can be used to redisplay <span class="insert">a representation</span></td><td class="lineno" valign="top"></td></tr>
881	<tr><td class="lineno" valign="top"></td><td class="lblock"> earlier in a session.</td><td> </td><td class="rblock"> retrieved earlier in a session.</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"> The freshness model (Section 2.3) does not necessarily apply to</td><td> </td><td class="right"> The freshness model (Section 2.3) does not necessarily apply to</td><td class="lineno" valign="top"></td></tr>
884	<tr><td class="lineno" valign="top"></td><td class="left"> history mechanisms. I.e., a history mechanism can display a previous</td><td> </td><td class="right"> history mechanisms. I.e., a history mechanism can display a previous</td><td class="lineno" valign="top"></td></tr>
885	<tr><td class="lineno" valign="top"></td><td class="left"> representation even if it has expired.</td><td> </td><td class="right"> representation even if it has expired.</td><td class="lineno" valign="top"></td></tr>
886	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
887	<tr><td class="lineno" valign="top"></td><td class="left"> This does not prohibit the history mechanism from telling the user</td><td> </td><td class="right"> This does not prohibit the history mechanism from telling the user</td><td class="lineno" valign="top"></td></tr>
888	<tr><td class="lineno" valign="top"></td><td class="left"> that a view might be stale, or from honoring cache directives (e.g.,</td><td> </td><td class="right"> that a view might be stale, or from honoring cache directives (e.g.,</td><td class="lineno" valign="top"></td></tr>
889	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control: no-store).</td><td> </td><td class="right"> Cache-Control: no-store).</td><td class="lineno" valign="top"></td></tr>
890	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
891	<tr><td class="lineno" valign="top"></td><td class="left">5. IANA Considerations</td><td> </td><td class="right">5. IANA Considerations</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">5.1. Cache Directive Registry</td><td> </td><td class="right">5.1. Cache Directive Registry</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"> The registration procedure for HTTP Cache Directives is defined by</td><td> </td><td class="right"> The registration procedure for HTTP Cache Directives is defined by</td><td class="lineno" valign="top"></td></tr>
896	<tr><td class="lineno" valign="top"></td><td class="left"> Section 3.2.3 of this document.</td><td> </td><td class="right"> Section 3.2.3 of this document.</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"> The HTTP Cache Directive Registry sh<span class="delete">ould</span> be created at</td><td> </td><td class="rblock"> The HTTP Cache Directive Registry sh<span class="insert">all</span> be created at</td><td class="lineno" valign="top"></td></tr>
900	<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>
901	<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>
902	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></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"> \| Cache Directive \| Reference \|</td><td> </td><td class="right"> \| Cache Directive \| Reference \|</td><td class="lineno" valign="top"></td></tr>
905	<tr><td class="lineno" valign="top"></td><td class="left"> +------------------------+------------------------------+</td><td> </td><td class="right"> +------------------------+------------------------------+</td><td class="lineno" valign="top"></td></tr>
906	<tr><td class="lineno" valign="top"></td><td class="left"> \| max-age \| Section 3.2.1, Section 3.2.2 \|</td><td> </td><td class="right"> \| max-age \| Section 3.2.1, Section 3.2.2 \|</td><td class="lineno" valign="top"></td></tr>
907	<tr><td class="lineno" valign="top"></td><td class="left"> \| max-stale \| Section 3.2.1 \|</td><td> </td><td class="right"> \| max-stale \| Section 3.2.1 \|</td><td class="lineno" valign="top"></td></tr>
908	<tr><td class="lineno" valign="top"></td><td class="left"> \| min-fresh \| Section 3.2.1 \|</td><td> </td><td class="right"> \| min-fresh \| Section 3.2.1 \|</td><td class="lineno" valign="top"></td></tr>
909	<tr><td class="lineno" valign="top"></td><td class="left"> \| must-revalidate \| Section 3.2.2 \|</td><td> </td><td class="right"> \| must-revalidate \| Section 3.2.2 \|</td><td class="lineno" valign="top"></td></tr>
910	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
911	<tr bgcolor="gray" ><td></td><th><a name="part-l19" /><small>skipping to change at</small><em> page 30, line 5</em></th><th> </th><th><a name="part-r19" /><small>skipping to change at</small><em> page 29, line 26</em></th><td></td></tr>
912	<tr><td class="lineno" valign="top"></td><td class="left"> \| no-transform \| Section 3.2.1, Section 3.2.2 \|</td><td> </td><td class="right"> \| no-transform \| Section 3.2.1, Section 3.2.2 \|</td><td class="lineno" valign="top"></td></tr>
913	<tr><td class="lineno" valign="top"></td><td class="left"> \| only-if-cached \| Section 3.2.1 \|</td><td> </td><td class="right"> \| only-if-cached \| Section 3.2.1 \|</td><td class="lineno" valign="top"></td></tr>
914	<tr><td class="lineno" valign="top"></td><td class="left"> \| private \| Section 3.2.2 \|</td><td> </td><td class="right"> \| private \| Section 3.2.2 \|</td><td class="lineno" valign="top"></td></tr>
915	<tr><td class="lineno" valign="top"></td><td class="left"> \| proxy-revalidate \| Section 3.2.2 \|</td><td> </td><td class="right"> \| proxy-revalidate \| Section 3.2.2 \|</td><td class="lineno" valign="top"></td></tr>
916	<tr><td class="lineno" valign="top"></td><td class="left"> \| public \| Section 3.2.2 \|</td><td> </td><td class="right"> \| public \| Section 3.2.2 \|</td><td class="lineno" valign="top"></td></tr>
917	<tr><td class="lineno" valign="top"></td><td class="left"> \| s-maxage \| Section 3.2.2 \|</td><td> </td><td class="right"> \| s-maxage \| Section 3.2.2 \|</td><td class="lineno" valign="top"></td></tr>
918	<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>
919	<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>
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"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
922	<tr><td><a name="diff0057" /></td></tr>
923	<tr><td class="lineno" valign="top"></td><td class="lblock">5.2. <span class="delete">Message Header</span> Registration</td><td> </td><td class="rblock">5.2. <span class="insert">Header Field</span> Registration</td><td class="lineno" valign="top"></td></tr>
924	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
925	<tr><td><a name="diff0058" /></td></tr>
926	<tr><td class="lineno" valign="top"></td><td class="lblock"> The Message Header Registry located at <http://www.iana.org/</td><td> </td><td class="rblock"> The Message Header <span class="insert">Field</span> Registry located at <http://www.iana.org/</td><td class="lineno" valign="top"></td></tr>
927	<tr><td class="lineno" valign="top"></td><td class="lblock"> assignments/message-headers/message-header-index.html> <span class="delete">should</span> be</td><td> </td><td class="rblock"> assignments/message-headers/message-header-index.html> <span class="insert">shall</span> be</td><td class="lineno" valign="top"></td></tr>
928	<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>
929	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
930	<tr><td class="lineno" valign="top"></td><td class="left"> +-------------------+----------+----------+-------------+</td><td> </td><td class="right"> +-------------------+----------+----------+-------------+</td><td class="lineno" valign="top"></td></tr>
931	<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>
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"> \| Age \| http \| standard \| Section 3.1 \|</td><td> </td><td class="right"> \| Age \| http \| standard \| Section 3.1 \|</td><td class="lineno" valign="top"></td></tr>
934	<tr><td class="lineno" valign="top"></td><td class="left"> \| Cache-Control \| http \| standard \| Section 3.2 \|</td><td> </td><td class="right"> \| Cache-Control \| http \| standard \| Section 3.2 \|</td><td class="lineno" valign="top"></td></tr>
935	<tr><td class="lineno" valign="top"></td><td class="left"> \| Expires \| http \| standard \| Section 3.3 \|</td><td> </td><td class="right"> \| Expires \| http \| standard \| Section 3.3 \|</td><td class="lineno" valign="top"></td></tr>
936	<tr><td class="lineno" valign="top"></td><td class="left"> \| Pragma \| http \| standard \| Section 3.4 \|</td><td> </td><td class="right"> \| Pragma \| http \| standard \| Section 3.4 \|</td><td class="lineno" valign="top"></td></tr>
937	<tr><td class="lineno" valign="top"></td><td class="left"> \| Vary \| http \| standard \| Section 3.5 \|</td><td> </td><td class="right"> \| Vary \| http \| standard \| Section 3.5 \|</td><td class="lineno" valign="top"></td></tr>
938	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
939	<tr bgcolor="gray" ><td></td><th><a name="part-l20" /><small>skipping to change at</small><em> page 30, line 32</em></th><th> </th><th><a name="part-r20" /><small>skipping to change at</small><em> page 30, line 5</em></th><td></td></tr>
940	<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>
941	<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>
942	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
943	<tr><td class="lineno" valign="top"></td><td class="left">6. Security Considerations</td><td> </td><td class="right">6. Security Considerations</td><td class="lineno" valign="top"></td></tr>
944	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
945	<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>
946	<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>
947	<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>
948	<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>
949	<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>
950	<tr><td><a name="diff0059" /></td></tr>
951	<tr><td class="lineno" valign="top"></td><td class="lblock"> network. Therefore, cache contents <span class="delete">should</span> be protected as sensitive</td><td> </td><td class="rblock"> network. Therefore, cache contents <span class="insert">need to</span> be protected as sensitive</td><td class="lineno" valign="top"></td></tr>
952	<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>
953	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
954	<tr><td class="lineno" valign="top"></td><td class="left">7. Acknowledgments</td><td> </td><td class="right">7. Acknowledgments</td><td class="lineno" valign="top"></td></tr>
955	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
956	<tr><td class="lineno" valign="top"></td><td class="left"> Much of the content and presentation of the caching design is due to</td><td> </td><td class="right"> Much of the content and presentation of the caching design is due to</td><td class="lineno" valign="top"></td></tr>
957	<tr><td class="lineno" valign="top"></td><td class="left"> suggestions and comments from individuals including: Shel Kaphan,</td><td> </td><td class="right"> suggestions and comments from individuals including: Shel Kaphan,</td><td class="lineno" valign="top"></td></tr>
958	<tr><td class="lineno" valign="top"></td><td class="left"> Paul Leach, Koen Holtman, David Morris, and Larry Masinter.</td><td> </td><td class="right"> Paul Leach, Koen Holtman, David Morris, and Larry Masinter.</td><td class="lineno" valign="top"></td></tr>
959	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
960	<tr><td class="lineno" valign="top"></td><td class="left">8. References</td><td> </td><td class="right">8. References</td><td class="lineno" valign="top"></td></tr>
961	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
962	<tr><td class="lineno" valign="top"></td><td class="left">8.1. Normative References</td><td> </td><td class="right">8.1. Normative References</td><td class="lineno" valign="top"></td></tr>
963	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
964	<tr><td class="lineno" valign="top"></td><td class="left"> [Part1] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right"> [Part1] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
965	<tr><td class="lineno" valign="top"></td><td class="left"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
966	<tr><td class="lineno" valign="top"></td><td class="left"> and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,</td><td> </td><td class="right"> and J. Reschke, Ed., "HTTP/1.1, part 1: URIs, Connections,</td><td class="lineno" valign="top"></td></tr>
967	<tr><td><a name="diff0060" /></td></tr>
968	<tr><td class="lineno" valign="top"></td><td class="lblock"> and Message Parsing", <span class="delete">draft-ietf-httpbis-p1-messaging-10</span></td><td> </td><td class="rblock"> and Message Parsing", <span class="insert">draft-ietf-httpbis-p1-messaging-11</span></td><td class="lineno" valign="top"></td></tr>
969	<tr><td class="lineno" valign="top"></td><td class="lblock"> (work in progress), <span class="delete">July</span> 2010.</td><td> </td><td class="rblock"> (work in progress), <span class="insert">August</span> 2010.</td><td class="lineno" valign="top"></td></tr>
970	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
971	<tr><td class="lineno" valign="top"></td><td class="left"> [Part2] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right"> [Part2] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
972	<tr><td class="lineno" valign="top"></td><td class="left"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
973	<tr><td class="lineno" valign="top"></td><td class="left"> and J. Reschke, Ed., "HTTP/1.1, part 2: Message</td><td> </td><td class="right"> and J. Reschke, Ed., "HTTP/1.1, part 2: Message</td><td class="lineno" valign="top"></td></tr>
974	<tr><td><a name="diff0061" /></td></tr>
975	<tr><td class="lineno" valign="top"></td><td class="lblock"> Semantics", <span class="delete">draft-ietf-httpbis-p2-semantics-10</span> (work in</td><td> </td><td class="rblock"> Semantics", <span class="insert">draft-ietf-httpbis-p2-semantics-11</span> (work in</td><td class="lineno" valign="top"></td></tr>
976	<tr><td class="lineno" valign="top"></td><td class="lblock"> progress), <span class="delete">July</span> 2010.</td><td> </td><td class="rblock"> progress), <span class="insert">August</span> 2010.</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"> [Part4] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right"> [Part4] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
979	<tr><td class="lineno" valign="top"></td><td class="left"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
980	<tr><td class="lineno" valign="top"></td><td class="left"> and J. Reschke, Ed., "HTTP/1.1, part 4: Conditional</td><td> </td><td class="right"> and J. Reschke, Ed., "HTTP/1.1, part 4: Conditional</td><td class="lineno" valign="top"></td></tr>
981	<tr><td><a name="diff0062" /></td></tr>
982	<tr><td class="lineno" valign="top"></td><td class="lblock"> Requests", <span class="delete">draft-ietf-httpbis-p4-conditional-10</span> (work in</td><td> </td><td class="rblock"> Requests", <span class="insert">draft-ietf-httpbis-p4-conditional-11</span> (work in</td><td class="lineno" valign="top"></td></tr>
983	<tr><td class="lineno" valign="top"></td><td class="lblock"> progress), <span class="delete">July</span> 2010.</td><td> </td><td class="rblock"> progress), <span class="insert">August</span> 2010.</td><td class="lineno" valign="top"></td></tr>
984	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
985	<tr><td class="lineno" valign="top"></td><td class="left"> [Part5] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right"> [Part5] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
986	<tr><td class="lineno" valign="top"></td><td class="left"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
987	<tr><td class="lineno" valign="top"></td><td class="left"> and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and</td><td> </td><td class="right"> and J. Reschke, Ed., "HTTP/1.1, part 5: Range Requests and</td><td class="lineno" valign="top"></td></tr>
988	<tr><td><a name="diff0063" /></td></tr>
989	<tr><td class="lineno" valign="top"></td><td class="lblock"> Partial Responses", <span class="delete">draft-ietf-httpbis-p5-range-10</span> (work</td><td> </td><td class="rblock"> Partial Responses", <span class="insert">draft-ietf-httpbis-p5-range-11</span> (work</td><td class="lineno" valign="top"></td></tr>
990	<tr><td class="lineno" valign="top"></td><td class="lblock"> in progress), <span class="delete">July</span> 2010.</td><td> </td><td class="rblock"> in progress), <span class="insert">August</span> 2010.</td><td class="lineno" valign="top"></td></tr>
991	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
992	<tr><td class="lineno" valign="top"></td><td class="left"> [Part7] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right"> [Part7] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
993	<tr><td class="lineno" valign="top"></td><td class="left"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td> </td><td class="right"> Masinter, L., Leach, P., Berners-Lee, T., Lafon, Y., Ed.,</td><td class="lineno" valign="top"></td></tr>
994	<tr><td class="lineno" valign="top"></td><td class="left"> and J. Reschke, Ed., "HTTP/1.1, part 7: Authentication",</td><td> </td><td class="right"> and J. Reschke, Ed., "HTTP/1.1, part 7: Authentication",</td><td class="lineno" valign="top"></td></tr>
995	<tr><td><a name="diff0064" /></td></tr>
996	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">draft-ietf-httpbis-p7-auth-10</span> (work in progress),</td><td> </td><td class="rblock"> <span class="insert">draft-ietf-httpbis-p7-auth-11</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
997	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">July</span> 2010.</td><td> </td><td class="rblock"> <span class="insert">August</span> 2010.</td><td class="lineno" valign="top"></td></tr>
998	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
999	<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>
1000	<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>
1001	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1002	<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>
1003	<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>
1004	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1005	<tr><td class="lineno" valign="top"></td><td class="left">8.2. Informative References</td><td> </td><td class="right">8.2. Informative References</td><td class="lineno" valign="top"></td></tr>
1006	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1007	<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>
1008	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
1009	<tr bgcolor="gray" ><td></td><th><a name="part-l21" /><small>skipping to change at</small><em> page 32, line 5</em></th><th> </th><th><a name="part-r21" /><small>skipping to change at</small><em> page 31, line 26</em></th><td></td></tr>
1010	<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>
1011	<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>
1012	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1013	<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>
1014	<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>
1015	<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>
1016	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1017	<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>
1018	<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>
1019	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1020	<tr><td><a name="diff0065" /></td></tr>
1021	<tr><td class="lineno" valign="top"></td><td class="lblock">Appendix A. <span class="delete">Compatibility with Previous Versions</span></td><td> </td><td class="rblock">Appendix A. Changes from RFC 2616</td><td class="lineno" valign="top"></td></tr>
1022	<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>
1023	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">A.1. Changes from RFC 2068</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"></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"> A case was missed in the Cache-Control model of HTTP/1.1; s-maxage</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"> was introduced to add this missing case. (Sections 2.1, 3.2).</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"></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"> Range request responses would become very verbose if all meta-data</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"> were always returned; by allowing the server to only send needed</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"> headers in a 206 response, this problem can be avoided.</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"> (Section 2.8)</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"></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"> The Cache-Control: max-age directive was not properly defined for</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"> responses. (Section 3.2.2)</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"></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"> Warnings could be cached incorrectly, or not updated appropriately.</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"> (Section 2.3, 2.8, 3.2, and 3.6) Warning also needed to be a general</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"> header, as PUT or other methods may have need for it in requests.</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"></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">A.2.</span> Changes from RFC 2616</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"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1042	<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>
1043	<tr><td class="lineno" valign="top"></td><td class="left"> (Section 2.3.2)</td><td> </td><td class="right"> (Section 2.3.2)</td><td class="lineno" valign="top"></td></tr>
1044	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1045	<tr><td class="lineno" valign="top"></td><td class="left"> Remove requirement to consider Content-Location in successful</td><td> </td><td class="right"> Remove requirement to consider Content-Location in successful</td><td class="lineno" valign="top"></td></tr>
1046	<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>
1047	<tr><td class="lineno" valign="top"></td><td class="left"> (Section 2.4)</td><td> </td><td class="right"> (Section 2.4)</td><td class="lineno" valign="top"></td></tr>
1048	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1049	<tr><td class="lineno" valign="top"></td><td class="left"> Clarify denial of service attack avoidance requirement.</td><td> </td><td class="right"> Clarify denial of service attack avoidance requirement.</td><td class="lineno" valign="top"></td></tr>
1050	<tr><td class="lineno" valign="top"></td><td class="left"> (Section 2.5)</td><td> </td><td class="right"> (Section 2.5)</td><td class="lineno" valign="top"></td></tr>
1051	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
1052	<tr bgcolor="gray" ><td></td><th><a name="part-l22" /><small>skipping to change at</small><em> page 38, line 8</em></th><th> </th><th><a name="part-r22" /><small>skipping to change at</small><em> page 37, line 10</em></th><td></td></tr>
1053	<tr><td class="lineno" valign="top"></td><td class="left"> for cache-control directives"</td><td> </td><td class="right"> for cache-control directives"</td><td class="lineno" valign="top"></td></tr>
1054	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1055	<tr><td class="lineno" valign="top"></td><td class="left"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/211>: "Heuristic</td><td> </td><td class="right"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/211>: "Heuristic</td><td class="lineno" valign="top"></td></tr>
1056	<tr><td class="lineno" valign="top"></td><td class="left"> caching of URLs with query components"</td><td> </td><td class="right"> caching of URLs with query components"</td><td class="lineno" valign="top"></td></tr>
1057	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1058	<tr><td class="lineno" valign="top"></td><td class="left"> Partly resolved issues:</td><td> </td><td class="right"> Partly resolved issues:</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"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/196>: "Term for the</td><td> </td><td class="right"> o <http://tools.ietf.org/wg/httpbis/trac/ticket/196>: "Term for the</td><td class="lineno" valign="top"></td></tr>
1061	<tr><td class="lineno" valign="top"></td><td class="left"> requested resource's URI"</td><td> </td><td class="right"> requested resource's URI"</td><td class="lineno" valign="top"></td></tr>
1062	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1063	<tr><td><a name="diff0066" /></td></tr>
1064	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">C.12. Since draft-ietf-httpbis-p6-cache-10</span></td><td class="lineno" valign="top"></td></tr>
1065	<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>
1066	<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>
1067	<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>
1068	<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/109>: "Clarify</span></td><td class="lineno" valign="top"></td></tr>
1069	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> entity / representation / variant terminology"</span></td><td class="lineno" valign="top"></td></tr>
1070	<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>
1071	<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/220>: "consider</span></td><td class="lineno" valign="top"></td></tr>
1072	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> removing the 'changes from 2068' sections"</span></td><td class="lineno" valign="top"></td></tr>
1073	<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>
1074	<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/223>: "Allowing</span></td><td class="lineno" valign="top"></td></tr>
1075	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> heuristic caching for new status codes"</span></td><td class="lineno" valign="top"></td></tr>
1076	<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>
1077	<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/223>: "Allowing</span></td><td class="lineno" valign="top"></td></tr>
1078	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> heuristic caching for new status codes"</span></td><td class="lineno" valign="top"></td></tr>
1079	<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>
1080	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o Clean up TODOs and prose in "Combining Responses."</span></td><td class="lineno" valign="top"></td></tr>
1081	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> </td><td class="lineno" valign="top"></td></tr>
1082	<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>
1083	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1084	<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>
1085	<tr><td class="lineno" valign="top"></td><td class="left"> age 6</td><td> </td><td class="right"> age 6</td><td class="lineno" valign="top"></td></tr>
1086	<tr><td class="lineno" valign="top"></td><td class="left"> Age header 17</td><td> </td><td class="right"> Age header 17</td><td class="lineno" valign="top"></td></tr>
1087	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1088	<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>
1089	<tr><td class="lineno" valign="top"></td><td class="left"> cache 5</td><td> </td><td class="right"> cache 5</td><td class="lineno" valign="top"></td></tr>
1090	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directives</td><td> </td><td class="right"> Cache Directives</td><td class="lineno" valign="top"></td></tr>
1091	<tr><td class="lineno" valign="top"></td><td class="left"> max-age 19, 22</td><td> </td><td class="right"> max-age 19, 22</td><td class="lineno" valign="top"></td></tr>
1092	<tr><td class="lineno" valign="top"></td><td class="left"> max-stale 19</td><td> </td><td class="right"> max-stale 19</td><td class="lineno" valign="top"></td></tr>
1093	<tr><td><a name="diff0067" /></td></tr>
1094	<tr><td class="lineno" valign="top"></td><td class="lblock"> min-fresh <span class="delete">20</span></td><td> </td><td class="rblock"> min-fresh <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
1095	<tr><td class="lineno" valign="top"></td><td class="left"> must-revalidate 22</td><td> </td><td class="right"> must-revalidate 22</td><td class="lineno" valign="top"></td></tr>
1096	<tr><td class="lineno" valign="top"></td><td class="left"> no-cache 19, 21</td><td> </td><td class="right"> no-cache 19, 21</td><td class="lineno" valign="top"></td></tr>
1097	<tr><td><a name="diff0068" /></td></tr>
1098	<tr><td class="lineno" valign="top"></td><td class="lblock"> no-store 19, <span class="delete">22</span></td><td> </td><td class="rblock"> no-store 19, <span class="insert">21</span></td><td class="lineno" valign="top"></td></tr>
1099	<tr><td class="lineno" valign="top"></td><td class="lblock"> no-transform 20, <span class="delete">23</span></td><td> </td><td class="rblock"> no-transform 20, <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
1100	<tr><td class="lineno" valign="top"></td><td class="left"> only-if-cached 20</td><td> </td><td class="right"> only-if-cached 20</td><td class="lineno" valign="top"></td></tr>
1101	<tr><td><a name="diff0069" /></td></tr>
1102	<tr><td class="lineno" valign="top"></td><td class="lblock"> private 2<span class="delete">1</span></td><td> </td><td class="rblock"> private 2<span class="insert">0</span></td><td class="lineno" valign="top"></td></tr>
1103	<tr><td class="lineno" valign="top"></td><td class="left"> proxy-revalidate 22</td><td> </td><td class="right"> proxy-revalidate 22</td><td class="lineno" valign="top"></td></tr>
1104	<tr><td class="lineno" valign="top"></td><td class="left"> public 20</td><td> </td><td class="right"> public 20</td><td class="lineno" valign="top"></td></tr>
1105	<tr><td class="lineno" valign="top"></td><td class="left"> s-maxage 22</td><td> </td><td class="right"> s-maxage 22</td><td class="lineno" valign="top"></td></tr>
1106	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control header 18</td><td> </td><td class="right"> Cache-Control header 18</td><td class="lineno" valign="top"></td></tr>
1107	<tr><td class="lineno" valign="top"></td><td class="left"> cacheable 5</td><td> </td><td class="right"> cacheable 5</td><td class="lineno" valign="top"></td></tr>
1108	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1109	<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>
1110	<tr><td class="lineno" valign="top"></td><td class="left"> Expires header 24</td><td> </td><td class="right"> Expires header 24</td><td class="lineno" valign="top"></td></tr>
1111	<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>
1112	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1113	<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>
1114	<tr><td class="lineno" valign="top"></td><td class="left"> first-hand 6</td><td> </td><td class="right"> first-hand 6</td><td class="lineno" valign="top"></td></tr>
1115	<tr><td class="lineno" valign="top"></td><td class="left"> fresh 6</td><td> </td><td class="right"> fresh 6</td><td class="lineno" valign="top"></td></tr>
1116	<tr><td class="lineno" valign="top"></td><td class="left"> freshness lifetime 6</td><td> </td><td class="right"> freshness lifetime 6</td><td class="lineno" valign="top"></td></tr>
1117	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1118	<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>
1119	<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>
1120	<tr><td><a name="diff0070" /></td></tr>
1121	<tr><td class="lineno" valign="top"></td><td class="lblock"> Age <span class="delete">18</span></td><td> </td><td class="rblock"> Age <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
1122	<tr><td class="lineno" valign="top"></td><td class="lblock"> Age-v <span class="delete">18</span></td><td> </td><td class="rblock"> Age-v <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
1123	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control 18</td><td> </td><td class="right"> Cache-Control 18</td><td class="lineno" valign="top"></td></tr>
1124	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control-v 18</td><td> </td><td class="right"> Cache-Control-v 18</td><td class="lineno" valign="top"></td></tr>
1125	<tr><td class="lineno" valign="top"></td><td class="left"> cache-extension 18</td><td> </td><td class="right"> cache-extension 18</td><td class="lineno" valign="top"></td></tr>
1126	<tr><td><a name="diff0071" /></td></tr>
1127	<tr><td class="lineno" valign="top"></td><td class="lblock"> cache-request-directive 1<span class="delete">9</span></td><td> </td><td class="rblock"> cache-request-directive 1<span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
1128	<tr><td class="lineno" valign="top"></td><td class="left"> cache-response-directive 20</td><td> </td><td class="right"> cache-response-directive 20</td><td class="lineno" valign="top"></td></tr>
1129	<tr><td><a name="diff0072" /></td></tr>
1130	<tr><td class="lineno" valign="top"></td><td class="lblock"> delta-seconds 1<span class="delete">8</span></td><td> </td><td class="rblock"> delta-seconds 1<span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
1131	<tr><td class="lineno" valign="top"></td><td class="left"> Expires 24</td><td> </td><td class="right"> Expires 24</td><td class="lineno" valign="top"></td></tr>
1132	<tr><td class="lineno" valign="top"></td><td class="left"> Expires-v 24</td><td> </td><td class="right"> Expires-v 24</td><td class="lineno" valign="top"></td></tr>
1133	<tr><td><a name="diff0073" /></td></tr>
1134	<tr><td class="lineno" valign="top"></td><td class="lblock"> extension-pragma <span class="delete">25</span></td><td> </td><td class="rblock"> extension-pragma <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
1135	<tr><td class="lineno" valign="top"></td><td class="lblock"> Pragma <span class="delete">25</span></td><td> </td><td class="rblock"> Pragma <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
1136	<tr><td class="lineno" valign="top"></td><td class="lblock"> pragma-directive <span class="delete">25</span></td><td> </td><td class="rblock"> pragma-directive <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
1137	<tr><td class="lineno" valign="top"></td><td class="lblock"> Pragma-v <span class="delete">25</span></td><td> </td><td class="rblock"> Pragma-v <span class="insert">24</span></td><td class="lineno" valign="top"></td></tr>
1138	<tr><td class="lineno" valign="top"></td><td class="lblock"> Vary <span class="delete">26</span></td><td> </td><td class="rblock"> Vary <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
1139	<tr><td class="lineno" valign="top"></td><td class="lblock"> Vary-v <span class="delete">26</span></td><td> </td><td class="rblock"> Vary-v <span class="insert">25</span></td><td class="lineno" valign="top"></td></tr>
1140	<tr><td class="lineno" valign="top"></td><td class="lblock"> warn-agent <span class="delete">27</span></td><td> </td><td class="rblock"> warn-agent <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
1141	<tr><td class="lineno" valign="top"></td><td class="lblock"> warn-code <span class="delete">27</span></td><td> </td><td class="rblock"> warn-code <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
1142	<tr><td class="lineno" valign="top"></td><td class="lblock"> warn-date <span class="delete">27</span></td><td> </td><td class="rblock"> warn-date <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
1143	<tr><td class="lineno" valign="top"></td><td class="lblock"> warn-text <span class="delete">27</span></td><td> </td><td class="rblock"> warn-text <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
1144	<tr><td class="lineno" valign="top"></td><td class="lblock"> Warning <span class="delete">27</span></td><td> </td><td class="rblock"> Warning <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
1145	<tr><td class="lineno" valign="top"></td><td class="lblock"> Warning-v <span class="delete">27</span></td><td> </td><td class="rblock"> Warning-v <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
1146	<tr><td class="lineno" valign="top"></td><td class="lblock"> warning-value <span class="delete">27</span></td><td> </td><td class="rblock"> warning-value <span class="insert">26</span></td><td class="lineno" valign="top"></td></tr>
1147	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1148	<tr><td class="lineno" valign="top"></td><td class="left"> H</td><td> </td><td class="right"> H</td><td class="lineno" valign="top"></td></tr>
1149	<tr><td class="lineno" valign="top"></td><td class="left"> Headers</td><td> </td><td class="right"> Headers</td><td class="lineno" valign="top"></td></tr>
1150	<tr><td class="lineno" valign="top"></td><td class="left"> Age 17</td><td> </td><td class="right"> Age 17</td><td class="lineno" valign="top"></td></tr>
1151	<tr><td class="lineno" valign="top"></td><td class="left"> Cache-Control 18</td><td> </td><td class="right"> Cache-Control 18</td><td class="lineno" valign="top"></td></tr>
1152	<tr><td class="lineno" valign="top"></td><td class="left"> Expires 24</td><td> </td><td class="right"> Expires 24</td><td class="lineno" valign="top"></td></tr>
1153	<tr><td><a name="diff0074" /></td></tr>
1154	<tr><td class="lineno" valign="top"></td><td class="lblock"> Pragma 2<span class="delete">5</span></td><td> </td><td class="rblock"> Pragma 2<span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
1155	<tr><td class="lineno" valign="top"></td><td class="left"> Vary 25</td><td> </td><td class="right"> Vary 25</td><td class="lineno" valign="top"></td></tr>
1156	<tr><td class="lineno" valign="top"></td><td class="left"> Warning 26</td><td> </td><td class="right"> Warning 26</td><td class="lineno" valign="top"></td></tr>
1157	<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>
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"> M</td><td> </td><td class="right"> M</td><td class="lineno" valign="top"></td></tr>
1160	<tr><td class="lineno" valign="top"></td><td class="left"> max-age</td><td> </td><td class="right"> max-age</td><td class="lineno" valign="top"></td></tr>
1161	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directive 19, 22</td><td> </td><td class="right"> Cache Directive 19, 22</td><td class="lineno" valign="top"></td></tr>
1162	<tr><td class="lineno" valign="top"></td><td class="left"> max-stale</td><td> </td><td class="right"> max-stale</td><td class="lineno" valign="top"></td></tr>
1163	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directive 19</td><td> </td><td class="right"> Cache Directive 19</td><td class="lineno" valign="top"></td></tr>
1164	<tr><td class="lineno" valign="top"></td><td class="left"> min-fresh</td><td> </td><td class="right"> min-fresh</td><td class="lineno" valign="top"></td></tr>
1165	<tr><td><a name="diff0075" /></td></tr>
1166	<tr><td class="lineno" valign="top"></td><td class="lblock"> Cache Directive <span class="delete">20</span></td><td> </td><td class="rblock"> Cache Directive <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
1167	<tr><td class="lineno" valign="top"></td><td class="left"> must-revalidate</td><td> </td><td class="right"> must-revalidate</td><td class="lineno" valign="top"></td></tr>
1168	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directive 22</td><td> </td><td class="right"> Cache Directive 22</td><td class="lineno" valign="top"></td></tr>
1169	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1170	<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>
1171	<tr><td class="lineno" valign="top"></td><td class="left"> no-cache</td><td> </td><td class="right"> no-cache</td><td class="lineno" valign="top"></td></tr>
1172	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directive 19, 21</td><td> </td><td class="right"> Cache Directive 19, 21</td><td class="lineno" valign="top"></td></tr>
1173	<tr><td class="lineno" valign="top"></td><td class="left"> no-store</td><td> </td><td class="right"> no-store</td><td class="lineno" valign="top"></td></tr>
1174	<tr><td><a name="diff0076" /></td></tr>
1175	<tr><td class="lineno" valign="top"></td><td class="lblock"> Cache Directive 19, 2<span class="delete">2</span></td><td> </td><td class="rblock"> Cache Directive 19, 2<span class="insert">1</span></td><td class="lineno" valign="top"></td></tr>
1176	<tr><td class="lineno" valign="top"></td><td class="left"> no-transform</td><td> </td><td class="right"> no-transform</td><td class="lineno" valign="top"></td></tr>
1177	<tr><td><a name="diff0077" /></td></tr>
1178	<tr><td class="lineno" valign="top"></td><td class="lblock"> Cache Directive 20, 2<span class="delete">3</span></td><td> </td><td class="rblock"> Cache Directive 20, 2<span class="insert">2</span></td><td class="lineno" valign="top"></td></tr>
1179	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1180	<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>
1181	<tr><td class="lineno" valign="top"></td><td class="left"> only-if-cached</td><td> </td><td class="right"> only-if-cached</td><td class="lineno" valign="top"></td></tr>
1182	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directive 20</td><td> </td><td class="right"> Cache Directive 20</td><td class="lineno" valign="top"></td></tr>
1183	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1184	<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>
1185	<tr><td><a name="diff0078" /></td></tr>
1186	<tr><td class="lineno" valign="top"></td><td class="lblock"> Pragma header 2<span class="delete">5</span></td><td> </td><td class="rblock"> Pragma header 2<span class="insert">4</span></td><td class="lineno" valign="top"></td></tr>
1187	<tr><td class="lineno" valign="top"></td><td class="left"> private</td><td> </td><td class="right"> private</td><td class="lineno" valign="top"></td></tr>
1188	<tr><td><a name="diff0079" /></td></tr>
1189	<tr><td class="lineno" valign="top"></td><td class="lblock"> Cache Directive 2<span class="delete">1</span></td><td> </td><td class="rblock"> Cache Directive 2<span class="insert">0</span></td><td class="lineno" valign="top"></td></tr>
1190	<tr><td class="lineno" valign="top"></td><td class="left"> proxy-revalidate</td><td> </td><td class="right"> proxy-revalidate</td><td class="lineno" valign="top"></td></tr>
1191	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directive 22</td><td> </td><td class="right"> Cache Directive 22</td><td class="lineno" valign="top"></td></tr>
1192	<tr><td class="lineno" valign="top"></td><td class="left"> public</td><td> </td><td class="right"> public</td><td class="lineno" valign="top"></td></tr>
1193	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directive 20</td><td> </td><td class="right"> Cache Directive 20</td><td class="lineno" valign="top"></td></tr>
1194	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1195	<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>
1196	<tr><td class="lineno" valign="top"></td><td class="left"> s-maxage</td><td> </td><td class="right"> s-maxage</td><td class="lineno" valign="top"></td></tr>
1197	<tr><td class="lineno" valign="top"></td><td class="left"> Cache Directive 22</td><td> </td><td class="right"> Cache Directive 22</td><td class="lineno" valign="top"></td></tr>
1198	<tr><td class="lineno" valign="top"></td><td class="left"> stale 6</td><td> </td><td class="right"> stale 6</td><td class="lineno" valign="top"></td></tr>
1199	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
1200
1201	<tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
1202	<tr bgcolor="gray"><th colspan="5" align="center"><a name="end"> End of changes. 79 change blocks. </a></th></tr>
1203	<tr class="stats"><td></td><th><i>191 lines changed or deleted</i></th><th><i> </i></th><th><i>167 lines changed or added</i></th><td></td></tr>
1204	<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>
1205	</table>
1206	</body>
1207	</html>

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