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42	<tr bgcolor="orange"><th></th><th> draft-ietf-httpbis-p4-conditional-01.txt </th><th> </th><th> draft-ietf-httpbis-p4-conditional-02.txt </th><th></th></tr>
43	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
44	<tr><td class="lineno" valign="top"></td><td class="left">Network Working Group R. Fielding, Ed.</td><td> </td><td class="right">Network Working Group R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
45	<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>
46	<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>
47	<tr><td class="lineno" valign="top"></td><td class="left">Intended status: Standards Track One Laptop per Child</td><td> </td><td class="right">Intended status: Standards Track One Laptop per Child</td><td class="lineno" valign="top"></td></tr>
48	<tr><td><a name="diff0001" /></td></tr>
49	<tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">July 15, 2008 </span> J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">August 27, 2008</span> J. Mogul</td><td class="lineno" valign="top"></td></tr>
50	<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>
51	<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>
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"> L. Masinter</td><td> </td><td class="right"> L. Masinter</td><td class="lineno" valign="top"></td></tr>
54	<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>
55	<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>
56	<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>
57	<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>
58	<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>
59	<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>
60	<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>
61	<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>
62	<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>
63	<tr><td><a name="diff0002" /></td></tr>
64	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete"> January 12</span>, 2008</td><td> </td><td class="rblock"> <span class="insert">February 24</span>, 2008</td><td class="lineno" valign="top"></td></tr>
65	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
66	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP/1.1, part 4: Conditional Requests</td><td> </td><td class="right"> HTTP/1.1, part 4: Conditional Requests</td><td class="lineno" valign="top"></td></tr>
67	<tr><td><a name="diff0003" /></td></tr>
68	<tr><td class="lineno" valign="top"></td><td class="lblock"> draft-ietf-httpbis-p4-conditional-0<span class="delete">1</span></td><td> </td><td class="rblock"> draft-ietf-httpbis-p4-conditional-0<span class="insert">2</span></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">Status of this Memo</td><td> </td><td class="right">Status of this Memo</td><td class="lineno" valign="top"></td></tr>
71	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
72	<tr><td class="lineno" valign="top"></td><td class="left"> By submitting this Internet-Draft, each author represents that any</td><td> </td><td class="right"> By submitting this Internet-Draft, each author represents that any</td><td class="lineno" valign="top"></td></tr>
73	<tr><td class="lineno" valign="top"></td><td class="left"> applicable patent or other IPR claims of which he or she is aware</td><td> </td><td class="right"> applicable patent or other IPR claims of which he or she is aware</td><td class="lineno" valign="top"></td></tr>
74	<tr><td class="lineno" valign="top"></td><td class="left"> have been or will be disclosed, and any of which he or she becomes</td><td> </td><td class="right"> have been or will be disclosed, and any of which he or she becomes</td><td class="lineno" valign="top"></td></tr>
75	<tr><td class="lineno" valign="top"></td><td class="left"> aware will be disclosed, in accordance with Section 6 of BCP 79.</td><td> </td><td class="right"> aware will be disclosed, in accordance with Section 6 of BCP 79.</td><td class="lineno" valign="top"></td></tr>
76	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
77	<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>
78	<tr><td class="lineno" valign="top"></td><td class="left"> Task Force (IETF), its areas, and its working groups. Note that</td><td> </td><td class="right"> Task Force (IETF), its areas, and its working groups. Note that</td><td class="lineno" valign="top"></td></tr>
79	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
80	<tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 1, line 49</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 1, line 49</em></th><td></td></tr>
81	<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>
82	<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>
83	<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>
84	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
85	<tr><td class="lineno" valign="top"></td><td class="left"> The list of current Internet-Drafts can be accessed at</td><td> </td><td class="right"> The list of current Internet-Drafts can be accessed at</td><td class="lineno" valign="top"></td></tr>
86	<tr><td class="lineno" valign="top"></td><td class="left"> http://www.ietf.org/ietf/1id-abstracts.txt.</td><td> </td><td class="right"> http://www.ietf.org/ietf/1id-abstracts.txt.</td><td class="lineno" valign="top"></td></tr>
87	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
88	<tr><td class="lineno" valign="top"></td><td class="left"> The list of Internet-Draft Shadow Directories can be accessed at</td><td> </td><td class="right"> The list of Internet-Draft Shadow Directories can be accessed at</td><td class="lineno" valign="top"></td></tr>
89	<tr><td class="lineno" valign="top"></td><td class="left"> http://www.ietf.org/shadow.html.</td><td> </td><td class="right"> http://www.ietf.org/shadow.html.</td><td class="lineno" valign="top"></td></tr>
90	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
91	<tr><td><a name="diff0004" /></td></tr>
92	<tr><td class="lineno" valign="top"></td><td class="lblock"> This Internet-Draft will expire on <span class="delete">July 15</span>, 2008.</td><td> </td><td class="rblock"> This Internet-Draft will expire on <span class="insert">August 27</span>, 2008.</td><td class="lineno" valign="top"></td></tr>
93	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
94	<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>
95	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
96	<tr><td class="lineno" valign="top"></td><td class="left"> Copyright (C) The IETF Trust (2008).</td><td> </td><td class="right"> Copyright (C) The IETF Trust (2008).</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">Abstract</td><td> </td><td class="right">Abstract</td><td class="lineno" valign="top"></td></tr>
99	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
100	<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>
101	<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>
102	<tr><td class="lineno" valign="top"></td><td class="left"> systems. HTTP has been in use by the World Wide Web global</td><td> </td><td class="right"> systems. HTTP has been in use by the World Wide Web global</td><td class="lineno" valign="top"></td></tr>
103	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
104	<tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 3, line 9</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 3, line 9</em></th><td></td></tr>
105	<tr><td class="lineno" valign="top"></td><td class="left"> This draft incorporates those issue resolutions that were either</td><td> </td><td class="right"> This draft incorporates those issue resolutions that were either</td><td class="lineno" valign="top"></td></tr>
106	<tr><td class="lineno" valign="top"></td><td class="left"> collected in the original RFC2616 errata list</td><td> </td><td class="right"> collected in the original RFC2616 errata list</td><td class="lineno" valign="top"></td></tr>
107	<tr><td class="lineno" valign="top"></td><td class="left"> (<http://purl.org/NET/http-errata>), or which were agreed upon on the</td><td> </td><td class="right"> (<http://purl.org/NET/http-errata>), or which were agreed upon on the</td><td class="lineno" valign="top"></td></tr>
108	<tr><td class="lineno" valign="top"></td><td class="left"> mailing list between October 2006 and November 2007 (as published in</td><td> </td><td class="right"> mailing list between October 2006 and November 2007 (as published in</td><td class="lineno" valign="top"></td></tr>
109	<tr><td class="lineno" valign="top"></td><td class="left"> "draft-lafon-rfc2616bis-03").</td><td> </td><td class="right"> "draft-lafon-rfc2616bis-03").</td><td class="lineno" valign="top"></td></tr>
110	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
111	<tr><td class="lineno" valign="top"></td><td class="left">Table of Contents</td><td> </td><td class="right">Table of Contents</td><td class="lineno" valign="top"></td></tr>
112	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
113	<tr><td class="lineno" valign="top"></td><td class="left"> 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4</td><td> </td><td class="right"> 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4</td><td class="lineno" valign="top"></td></tr>
114	<tr><td class="lineno" valign="top"></td><td class="left"> 1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 4</td><td> </td><td class="right"> 1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . . 4</td><td class="lineno" valign="top"></td></tr>
115	<tr><td><a name="diff0005" /></td></tr>
116	<tr><td class="lineno" valign="top"></td><td class="lblock"> 2. Entity Tags . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">4</span></td><td> </td><td class="rblock"> 2. <span class="insert">Notational Conventions and Generic Grammar . . . . . . . . . . 4</span></td><td class="lineno" valign="top"></td></tr>
117	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 3.</span> Status Code Definitions . . . . . . . . . . . . . . . . . . . 5</td><td> </td><td class="rblock"><span class="insert"> 3.</span> Entity Tags . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
118	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">3.1.</span> 304 Not Modified . . . . . . . . . . . . . . . . . . . . . 5</td><td> </td><td class="rblock"><span class="insert"> 4.</span> Status Code Definitions . . . . . . . . . . . . . . . . . . . 5</td><td class="lineno" valign="top"></td></tr>
119	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">3.2.</span> 412 Precondition Failed . . . . . . . . . . . . . . . . . 6</td><td> </td><td class="rblock"> <span class="insert">4.1.</span> 304 Not Modified . . . . . . . . . . . . . . . . . . . . . 5</td><td class="lineno" valign="top"></td></tr>
120	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">4.</span> Weak and Strong Validators . . . . . . . . . . . . . . . . . . 6</td><td> </td><td class="rblock"> <span class="insert">4.2.</span> 412 Precondition Failed . . . . . . . . . . . . . . . . . 6</td><td class="lineno" valign="top"></td></tr>
121	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">5.</span> Rules for When to Use Entity Tags and Last-Modified Dates . . 9</td><td> </td><td class="rblock"> <span class="insert">5.</span> Weak and Strong Validators . . . . . . . . . . . . . . . . . . 6</td><td class="lineno" valign="top"></td></tr>
122	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">6.</span> Header Field Definitions . . . . . . . . . . . . . . . . . . . <span class="delete">10</span></td><td> </td><td class="rblock"> <span class="insert">6.</span> Rules for When to Use Entity Tags and Last-Modified Dates . . 9</td><td class="lineno" valign="top"></td></tr>
123	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 6.1.</span> ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="rblock"> <span class="insert">7.</span> Header Field Definitions . . . . . . . . . . . . . . . . . . . <span class="insert">11</span></td><td class="lineno" valign="top"></td></tr>
124	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">6.2.</span> If-Match . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">11</span></td><td> </td><td class="rblock"><span class="insert"> 7.1.</span> ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
125	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 6.3.</span> If-Modified-Since . . . . . . . . . . . . . . . . . . . . <span class="delete">12</span></td><td> </td><td class="rblock"> <span class="insert">7.2.</span> If-Match . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">12</span></td><td class="lineno" valign="top"></td></tr>
126	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 6.4.</span> If-None-Match . . . . . . . . . . . . . . . . . . . . . . 14</td><td> </td><td class="rblock"><span class="insert"> 7.3.</span> If-Modified-Since . . . . . . . . . . . . . . . . . . . . <span class="insert">13</span></td><td class="lineno" valign="top"></td></tr>
127	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">6.5.</span> If-Unmodified-Since . . . . . . . . . . . . . . . . . . . <span class="delete">15</span></td><td> </td><td class="rblock"><span class="insert"> 7.4.</span> If-None-Match . . . . . . . . . . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
128	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 6.6.</span> Last-Modified . . . . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="rblock"> <span class="insert">7.5.</span> If-Unmodified-Since . . . . . . . . . . . . . . . . . . . <span class="insert">16</span></td><td class="lineno" valign="top"></td></tr>
129	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">7.</span> IANA Considerations . . . . . . . . . . . . . . . . . . . . . <span class="delete">16</span></td><td> </td><td class="rblock"><span class="insert"> 7.6.</span> Last-Modified . . . . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
130	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 8.</span> Security Considerations . . . . . . . . . . . . . . . . . . . <span class="delete">16</span></td><td> </td><td class="rblock"> <span class="insert">8.</span> IANA Considerations . . . . . . . . . . . . . . . . . . . . . <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
131	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 9.</span> Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">16</span></td><td> </td><td class="rblock"><span class="insert"> 9.</span> Security Considerations . . . . . . . . . . . . . . . . . . . <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
132	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 10.</span> References . . . . . . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="rblock"><span class="insert"> 10.</span> Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
133	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">10.1.</span> Normative References . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="rblock"><span class="insert"> 11.</span> References . . . . . . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
134	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">10.2.</span> Informative References . . . . . . . . . . . . . . . . . . <span class="delete">17</span></td><td> </td><td class="rblock"> <span class="insert">11.1.</span> Normative References . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
135	<tr><td class="lineno" valign="top"></td><td class="lblock"> Appendix A. Compatibility with Previous Versions . . . . . . . . <span class="delete">17</span></td><td> </td><td class="rblock"> <span class="insert">11.2.</span> Informative References . . . . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
136	<tr><td class="lineno" valign="top"></td><td class="lblock"> A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . <span class="delete">17</span></td><td> </td><td class="rblock"> Appendix A. Compatibility with Previous Versions . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
137	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
138	<tr><td class="lineno" valign="top"></td><td class="left"> Appendix B. Change Log (to be removed by RFC Editor before</td><td> </td><td class="right"> Appendix B. Change Log (to be removed by RFC Editor before</td><td class="lineno" valign="top"></td></tr>
139	<tr><td><a name="diff0006" /></td></tr>
140	<tr><td class="lineno" valign="top"></td><td class="lblock"> publication) . . . . . . . . . . . . . . . . . . . . <span class="delete">17</span></td><td> </td><td class="rblock"> publication) . . . . . . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
141	<tr><td class="lineno" valign="top"></td><td class="lblock"> B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . <span class="delete">17</span></td><td> </td><td class="rblock"> B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . <span class="insert">18</span></td><td class="lineno" valign="top"></td></tr>
142	<tr><td class="lineno" valign="top"></td><td class="left"> B.2. Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 18</td><td> </td><td class="right"> B.2. Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
143	<tr><td><a name="diff0007" /></td></tr>
144	<tr><td class="lineno" valign="top"></td><td class="lblock"> Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">18</span></td><td> </td><td class="rblock"> <span class="insert">B.3. Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 18</span></td><td class="lineno" valign="top"></td></tr>
145	<tr><td class="lineno" valign="top"></td><td class="lblock"> Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock"> Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
146	<tr><td class="lineno" valign="top"></td><td class="lblock"> Intellectual Property and Copyright Statements . . . . . . . . . . <span class="delete">22</span></td><td> </td><td class="rblock"> Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">20</span></td><td class="lineno" valign="top"></td></tr>
147	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> Intellectual Property and Copyright Statements . . . . . . . . . . <span class="insert">23</span></td><td class="lineno" valign="top"></td></tr>
148	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
149	<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>
150	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
151	<tr><td class="lineno" valign="top"></td><td class="left"> This document defines HTTP/1.1 response metadata for indicating</td><td> </td><td class="right"> This document defines HTTP/1.1 response metadata for indicating</td><td class="lineno" valign="top"></td></tr>
152	<tr><td class="lineno" valign="top"></td><td class="left"> potential changes to payload content, including modification time</td><td> </td><td class="right"> potential changes to payload content, including modification time</td><td class="lineno" valign="top"></td></tr>
153	<tr><td class="lineno" valign="top"></td><td class="left"> stamps and opaque entity-tags, and the HTTP conditional request</td><td> </td><td class="right"> stamps and opaque entity-tags, and the HTTP conditional request</td><td class="lineno" valign="top"></td></tr>
154	<tr><td class="lineno" valign="top"></td><td class="left"> mechanisms that allow preconditions to be placed on a request method.</td><td> </td><td class="right"> mechanisms that allow preconditions to be placed on a request method.</td><td class="lineno" valign="top"></td></tr>
155	<tr><td class="lineno" valign="top"></td><td class="left"> Conditional GET requests allow for efficient cache updates. Other</td><td> </td><td class="right"> Conditional GET requests allow for efficient cache updates. Other</td><td class="lineno" valign="top"></td></tr>
156	<tr><td class="lineno" valign="top"></td><td class="left"> conditional request methods are used to protect against overwriting</td><td> </td><td class="right"> conditional request methods are used to protect against overwriting</td><td class="lineno" valign="top"></td></tr>
157	<tr><td class="lineno" valign="top"></td><td class="left"> or misunderstanding the state of a resource that has been changed</td><td> </td><td class="right"> or misunderstanding the state of a resource that has been changed</td><td class="lineno" valign="top"></td></tr>
158	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
159	<tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 4, line 43</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 4, line 43</em></th><td></td></tr>
160	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
161	<tr><td class="lineno" valign="top"></td><td class="left"> An implementation is not compliant if it fails to satisfy one or more</td><td> </td><td class="right"> An implementation is not compliant if it fails to satisfy one or more</td><td class="lineno" valign="top"></td></tr>
162	<tr><td class="lineno" valign="top"></td><td class="left"> of the MUST or REQUIRED level requirements for the protocols it</td><td> </td><td class="right"> of the MUST or REQUIRED level requirements for the protocols it</td><td class="lineno" valign="top"></td></tr>
163	<tr><td class="lineno" valign="top"></td><td class="left"> implements. An implementation that satisfies all the MUST or</td><td> </td><td class="right"> implements. An implementation that satisfies all the MUST or</td><td class="lineno" valign="top"></td></tr>
164	<tr><td class="lineno" valign="top"></td><td class="left"> REQUIRED level and all the SHOULD level requirements for its</td><td> </td><td class="right"> REQUIRED level and all the SHOULD level requirements for its</td><td class="lineno" valign="top"></td></tr>
165	<tr><td class="lineno" valign="top"></td><td class="left"> protocols is said to be "unconditionally compliant"; one that</td><td> </td><td class="right"> protocols is said to be "unconditionally compliant"; one that</td><td class="lineno" valign="top"></td></tr>
166	<tr><td class="lineno" valign="top"></td><td class="left"> satisfies all the MUST level requirements but not all the SHOULD</td><td> </td><td class="right"> satisfies all the MUST level requirements but not all the SHOULD</td><td class="lineno" valign="top"></td></tr>
167	<tr><td class="lineno" valign="top"></td><td class="left"> level requirements for its protocols is said to be "conditionally</td><td> </td><td class="right"> level requirements for its protocols is said to be "conditionally</td><td class="lineno" valign="top"></td></tr>
168	<tr><td class="lineno" valign="top"></td><td class="left"> compliant."</td><td> </td><td class="right"> compliant."</td><td class="lineno" valign="top"></td></tr>
169	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
170	<tr><td><a name="diff0008" /></td></tr>
171	<tr><td class="lineno" valign="top"></td><td class="lblock">2. Entity Tags</td><td> </td><td class="rblock">2. <span class="insert">Notational Conventions and Generic Grammar</span></td><td class="lineno" valign="top"></td></tr>
172	<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>
173	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> This specification uses the ABNF syntax defined in Section 2.1 of</span></td><td class="lineno" valign="top"></td></tr>
174	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> [Part1] and the core rules defined in Section 2.2 of [Part1]:</span></td><td class="lineno" valign="top"></td></tr>
175	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> [[abnf.dep: ABNF syntax and basic rules will be adopted from RFC</span></td><td class="lineno" valign="top"></td></tr>
176	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> 5234, see <http://tools.ietf.org/wg/httpbis/trac/ticket/36>.]]</span></td><td class="lineno" valign="top"></td></tr>
177	<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>
178	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> quoted-string = <quoted-string, defined in [Part1], Section 2.2></span></td><td class="lineno" valign="top"></td></tr>
179	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> The ABNF rules below are defined in other parts:</span></td><td class="lineno" valign="top"></td></tr>
180	<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>
181	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> HTTP-date = <HTTP-date, defined in [Part1], Section 3.3.1></span></td><td class="lineno" valign="top"></td></tr>
182	<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>
183	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">3.</span> Entity Tags</td><td class="lineno" valign="top"></td></tr>
184	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
185	<tr><td class="lineno" valign="top"></td><td class="left"> Entity tags are used for comparing two or more entities from the same</td><td> </td><td class="right"> Entity tags are used for comparing two or more entities from the same</td><td class="lineno" valign="top"></td></tr>
186	<tr><td class="lineno" valign="top"></td><td class="left"> requested resource. HTTP/1.1 uses entity tags in the ETag</td><td> </td><td class="right"> requested resource. HTTP/1.1 uses entity tags in the ETag</td><td class="lineno" valign="top"></td></tr>
187	<tr><td><a name="diff0009" /></td></tr>
188	<tr><td class="lineno" valign="top"></td><td class="lblock"> (Section <span class="delete">6.1),</span> If-Match (Section <span class="delete">6.2),</span> If-None-Match (Section <span class="delete">6.4),</span></td><td> </td><td class="rblock"> (Section <span class="insert">7.1),</span> If-Match (Section <span class="insert">7.2),</span> If-None-Match (Section <span class="insert">7.4),</span></td><td class="lineno" valign="top"></td></tr>
189	<tr><td class="lineno" valign="top"></td><td class="lblock"> and If-Range (Section <span class="delete">5.3</span> of [Part5]) header fields. The definition</td><td> </td><td class="rblock"> and If-Range (Section <span class="insert">6.3</span> of [Part5]) header fields. The definition</td><td class="lineno" valign="top"></td></tr>
190	<tr><td class="lineno" valign="top"></td><td class="left"> of how they are used and compared as cache validators is in</td><td> </td><td class="right"> of how they are used and compared as cache validators is in</td><td class="lineno" valign="top"></td></tr>
191	<tr><td><a name="diff0010" /></td></tr>
192	<tr><td class="lineno" valign="top"></td><td class="lblock"> Section <span class="delete">4</span>. An entity tag consists of an opaque quoted string,</td><td> </td><td class="rblock"> Section <span class="insert">5</span>. An entity tag consists of an opaque quoted string,</td><td class="lineno" valign="top"></td></tr>
193	<tr><td class="lineno" valign="top"></td><td class="left"> possibly prefixed by a weakness indicator.</td><td> </td><td class="right"> possibly prefixed by a weakness indicator.</td><td class="lineno" valign="top"></td></tr>
194	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
195	<tr><td class="lineno" valign="top"></td><td class="left"> entity-tag = [ weak ] opaque-tag</td><td> </td><td class="right"> entity-tag = [ weak ] opaque-tag</td><td class="lineno" valign="top"></td></tr>
196	<tr><td class="lineno" valign="top"></td><td class="left"> weak = "W/"</td><td> </td><td class="right"> weak = "W/"</td><td class="lineno" valign="top"></td></tr>
197	<tr><td class="lineno" valign="top"></td><td class="left"> opaque-tag = quoted-string</td><td> </td><td class="right"> opaque-tag = quoted-string</td><td class="lineno" valign="top"></td></tr>
198	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
199	<tr><td class="lineno" valign="top"></td><td class="left"> A "strong entity tag" MAY be shared by two entities of a resource</td><td> </td><td class="right"> A "strong entity tag" MAY be shared by two entities of a resource</td><td class="lineno" valign="top"></td></tr>
200	<tr><td class="lineno" valign="top"></td><td class="left"> only if they are equivalent by octet equality.</td><td> </td><td class="right"> only if they are equivalent by octet equality.</td><td class="lineno" valign="top"></td></tr>
201	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
202	<tr><td class="lineno" valign="top"></td><td class="left"> A "weak entity tag," indicated by the "W/" prefix, MAY be shared by</td><td> </td><td class="right"> A "weak entity tag," indicated by the "W/" prefix, MAY be shared by</td><td class="lineno" valign="top"></td></tr>
203	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
204	<tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 5, line 24</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 5, line 37</em></th><td></td></tr>
205	<tr><td class="lineno" valign="top"></td><td class="left"> could be substituted for each other with no significant change in</td><td> </td><td class="right"> could be substituted for each other with no significant change in</td><td class="lineno" valign="top"></td></tr>
206	<tr><td class="lineno" valign="top"></td><td class="left"> semantics. A weak entity tag can only be used for weak comparison.</td><td> </td><td class="right"> semantics. A weak entity tag can only be used for weak comparison.</td><td class="lineno" valign="top"></td></tr>
207	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
208	<tr><td class="lineno" valign="top"></td><td class="left"> An entity tag MUST be unique across all versions of all entities</td><td> </td><td class="right"> An entity tag MUST be unique across all versions of all entities</td><td class="lineno" valign="top"></td></tr>
209	<tr><td class="lineno" valign="top"></td><td class="left"> associated with a particular resource. A given entity tag value MAY</td><td> </td><td class="right"> associated with a particular resource. A given entity tag value MAY</td><td class="lineno" valign="top"></td></tr>
210	<tr><td class="lineno" valign="top"></td><td class="left"> be used for entities obtained by requests on different URIs. The use</td><td> </td><td class="right"> be used for entities obtained by requests on different URIs. The use</td><td class="lineno" valign="top"></td></tr>
211	<tr><td class="lineno" valign="top"></td><td class="left"> of the same entity tag value in conjunction with entities obtained by</td><td> </td><td class="right"> of the same entity tag value in conjunction with entities obtained by</td><td class="lineno" valign="top"></td></tr>
212	<tr><td class="lineno" valign="top"></td><td class="left"> requests on different URIs does not imply the equivalence of those</td><td> </td><td class="right"> requests on different URIs does not imply the equivalence of those</td><td class="lineno" valign="top"></td></tr>
213	<tr><td class="lineno" valign="top"></td><td class="left"> entities.</td><td> </td><td class="right"> entities.</td><td class="lineno" valign="top"></td></tr>
214	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
215	<tr><td><a name="diff0011" /></td></tr>
216	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">3</span>. Status Code Definitions</td><td> </td><td class="rblock"><span class="insert">4</span>. Status Code Definitions</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><a name="diff0012" /></td></tr>
219	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">3</span>.1. 304 Not Modified</td><td> </td><td class="rblock"><span class="insert">4</span>.1. 304 Not Modified</td><td class="lineno" valign="top"></td></tr>
220	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
221	<tr><td class="lineno" valign="top"></td><td class="left"> If the client has performed a conditional GET request and access is</td><td> </td><td class="right"> If the client has performed a conditional GET request and access is</td><td class="lineno" valign="top"></td></tr>
222	<tr><td class="lineno" valign="top"></td><td class="left"> allowed, but the document has not been modified, the server SHOULD</td><td> </td><td class="right"> allowed, but the document has not been modified, the server SHOULD</td><td class="lineno" valign="top"></td></tr>
223	<tr><td class="lineno" valign="top"></td><td class="left"> respond with this status code. The 304 response MUST NOT contain a</td><td> </td><td class="right"> respond with this status code. The 304 response MUST NOT contain a</td><td class="lineno" valign="top"></td></tr>
224	<tr><td class="lineno" valign="top"></td><td class="left"> message-body, and thus is always terminated by the first empty line</td><td> </td><td class="right"> message-body, and thus is always terminated by the first empty line</td><td class="lineno" valign="top"></td></tr>
225	<tr><td class="lineno" valign="top"></td><td class="left"> after the header fields.</td><td> </td><td class="right"> after the header fields.</td><td class="lineno" valign="top"></td></tr>
226	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
227	<tr><td class="lineno" valign="top"></td><td class="left"> The response MUST include the following header fields:</td><td> </td><td class="right"> The response MUST include the following header fields:</td><td class="lineno" valign="top"></td></tr>
228	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
229	<tr><td class="lineno" valign="top"></td><td class="left"> o Date, unless its omission is required by Section 8.3.1 of [Part1]</td><td> </td><td class="right"> o Date, unless its omission is required by Section 8.3.1 of [Part1]</td><td class="lineno" valign="top"></td></tr>
230	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
231	<tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 5, line 50</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 6, line 19</em></th><td></td></tr>
232	<tr><td class="lineno" valign="top"></td><td class="left"> already specified by [RFC2068], Section 14.19), caches will operate</td><td> </td><td class="right"> already specified by [RFC2068], Section 14.19), caches will operate</td><td class="lineno" valign="top"></td></tr>
233	<tr><td class="lineno" valign="top"></td><td class="left"> correctly.</td><td> </td><td class="right"> correctly.</td><td class="lineno" valign="top"></td></tr>
234	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
235	<tr><td class="lineno" valign="top"></td><td class="left"> o ETag and/or Content-Location, if the header would have been sent</td><td> </td><td class="right"> o ETag and/or Content-Location, if the header would have been sent</td><td class="lineno" valign="top"></td></tr>
236	<tr><td class="lineno" valign="top"></td><td class="left"> in a 200 response to the same request</td><td> </td><td class="right"> in a 200 response to the same request</td><td class="lineno" valign="top"></td></tr>
237	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
238	<tr><td class="lineno" valign="top"></td><td class="left"> o Expires, Cache-Control, and/or Vary, if the field-value might</td><td> </td><td class="right"> o Expires, Cache-Control, and/or Vary, if the field-value might</td><td class="lineno" valign="top"></td></tr>
239	<tr><td class="lineno" valign="top"></td><td class="left"> differ from that sent in any previous response for the same</td><td> </td><td class="right"> differ from that sent in any previous response for the same</td><td class="lineno" valign="top"></td></tr>
240	<tr><td class="lineno" valign="top"></td><td class="left"> variant</td><td> </td><td class="right"> variant</td><td class="lineno" valign="top"></td></tr>
241	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
242	<tr><td><a name="diff0013" /></td></tr>
243	<tr><td class="lineno" valign="top"></td><td class="lblock"> If the conditional GET used a strong cache validator (see Section <span class="delete">4</span>),</td><td> </td><td class="rblock"> If the conditional GET used a strong cache validator (see Section <span class="insert">5</span>),</td><td class="lineno" valign="top"></td></tr>
244	<tr><td class="lineno" valign="top"></td><td class="left"> the response SHOULD NOT include other entity-headers. Otherwise</td><td> </td><td class="right"> the response SHOULD NOT include other entity-headers. Otherwise</td><td class="lineno" valign="top"></td></tr>
245	<tr><td class="lineno" valign="top"></td><td class="left"> (i.e., the conditional GET used a weak validator), the response MUST</td><td> </td><td class="right"> (i.e., the conditional GET used a weak validator), the response MUST</td><td class="lineno" valign="top"></td></tr>
246	<tr><td class="lineno" valign="top"></td><td class="left"> NOT include other entity-headers; this prevents inconsistencies</td><td> </td><td class="right"> NOT include other entity-headers; this prevents inconsistencies</td><td class="lineno" valign="top"></td></tr>
247	<tr><td class="lineno" valign="top"></td><td class="left"> between cached entity-bodies and updated headers.</td><td> </td><td class="right"> between cached entity-bodies and updated headers.</td><td class="lineno" valign="top"></td></tr>
248	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
249	<tr><td class="lineno" valign="top"></td><td class="left"> If a 304 response indicates an entity not currently cached, then the</td><td> </td><td class="right"> If a 304 response indicates an entity not currently cached, then the</td><td class="lineno" valign="top"></td></tr>
250	<tr><td class="lineno" valign="top"></td><td class="left"> cache MUST disregard the response and repeat the request without the</td><td> </td><td class="right"> cache MUST disregard the response and repeat the request without the</td><td class="lineno" valign="top"></td></tr>
251	<tr><td class="lineno" valign="top"></td><td class="left"> conditional.</td><td> </td><td class="right"> conditional.</td><td class="lineno" valign="top"></td></tr>
252	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
253	<tr><td class="lineno" valign="top"></td><td class="left"> If a cache uses a received 304 response to update a cache entry, the</td><td> </td><td class="right"> If a cache uses a received 304 response to update a cache entry, the</td><td class="lineno" valign="top"></td></tr>
254	<tr><td class="lineno" valign="top"></td><td class="left"> cache MUST update the entry to reflect any new field values given in</td><td> </td><td class="right"> cache MUST update the entry to reflect any new field values given in</td><td class="lineno" valign="top"></td></tr>
255	<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>
256	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
257	<tr><td><a name="diff0014" /></td></tr>
258	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">3</span>.2. 412 Precondition Failed</td><td> </td><td class="rblock"><span class="insert">4</span>.2. 412 Precondition Failed</td><td class="lineno" valign="top"></td></tr>
259	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
260	<tr><td class="lineno" valign="top"></td><td class="left"> The precondition given in one or more of the request-header fields</td><td> </td><td class="right"> The precondition given in one or more of the request-header fields</td><td class="lineno" valign="top"></td></tr>
261	<tr><td class="lineno" valign="top"></td><td class="left"> evaluated to false when it was tested on the server. This response</td><td> </td><td class="right"> evaluated to false when it was tested on the server. This response</td><td class="lineno" valign="top"></td></tr>
262	<tr><td class="lineno" valign="top"></td><td class="left"> code allows the client to place preconditions on the current resource</td><td> </td><td class="right"> code allows the client to place preconditions on the current resource</td><td class="lineno" valign="top"></td></tr>
263	<tr><td class="lineno" valign="top"></td><td class="left"> metainformation (header field data) and thus prevent the requested</td><td> </td><td class="right"> metainformation (header field data) and thus prevent the requested</td><td class="lineno" valign="top"></td></tr>
264	<tr><td class="lineno" valign="top"></td><td class="left"> method from being applied to a resource other than the one intended.</td><td> </td><td class="right"> method from being applied to a resource other than the one intended.</td><td class="lineno" valign="top"></td></tr>
265	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
266	<tr><td><a name="diff0015" /></td></tr>
267	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">4</span>. Weak and Strong Validators</td><td> </td><td class="rblock"><span class="insert">5</span>. Weak and Strong Validators</td><td class="lineno" valign="top"></td></tr>
268	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
269	<tr><td class="lineno" valign="top"></td><td class="left"> Since both origin servers and caches will compare two validators to</td><td> </td><td class="right"> Since both origin servers and caches will compare two validators to</td><td class="lineno" valign="top"></td></tr>
270	<tr><td class="lineno" valign="top"></td><td class="left"> decide if they represent the same or different entities, one normally</td><td> </td><td class="right"> decide if they represent the same or different entities, one normally</td><td class="lineno" valign="top"></td></tr>
271	<tr><td class="lineno" valign="top"></td><td class="left"> would expect that if the entity (the entity-body or any entity-</td><td> </td><td class="right"> would expect that if the entity (the entity-body or any entity-</td><td class="lineno" valign="top"></td></tr>
272	<tr><td class="lineno" valign="top"></td><td class="left"> headers) changes in any way, then the associated validator would</td><td> </td><td class="right"> headers) changes in any way, then the associated validator would</td><td class="lineno" valign="top"></td></tr>
273	<tr><td class="lineno" valign="top"></td><td class="left"> change as well. If this is true, then we call this validator a</td><td> </td><td class="right"> change as well. If this is true, then we call this validator a</td><td class="lineno" valign="top"></td></tr>
274	<tr><td class="lineno" valign="top"></td><td class="left"> "strong validator."</td><td> </td><td class="right"> "strong validator."</td><td class="lineno" valign="top"></td></tr>
275	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
276	<tr><td class="lineno" valign="top"></td><td class="left"> However, there might be cases when a server prefers to change the</td><td> </td><td class="right"> However, there might be cases when a server prefers to change the</td><td class="lineno" valign="top"></td></tr>
277	<tr><td class="lineno" valign="top"></td><td class="left"> validator only on semantically significant changes, and not when</td><td> </td><td class="right"> validator only on semantically significant changes, and not when</td><td class="lineno" valign="top"></td></tr>
278	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
279	<tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 7, line 30</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 7, line 44</em></th><td></td></tr>
280	<tr><td class="lineno" valign="top"></td><td class="left"> only usable in contexts that do not depend on exact equality of an</td><td> </td><td class="right"> only usable in contexts that do not depend on exact equality of an</td><td class="lineno" valign="top"></td></tr>
281	<tr><td class="lineno" valign="top"></td><td class="left"> entity. For example, either kind is usable for a conditional GET of</td><td> </td><td class="right"> entity. For example, either kind is usable for a conditional GET of</td><td class="lineno" valign="top"></td></tr>
282	<tr><td class="lineno" valign="top"></td><td class="left"> a full entity. However, only a strong validator is usable for a sub-</td><td> </td><td class="right"> a full entity. However, only a strong validator is usable for a sub-</td><td class="lineno" valign="top"></td></tr>
283	<tr><td class="lineno" valign="top"></td><td class="left"> range retrieval, since otherwise the client might end up with an</td><td> </td><td class="right"> range retrieval, since otherwise the client might end up with an</td><td class="lineno" valign="top"></td></tr>
284	<tr><td class="lineno" valign="top"></td><td class="left"> internally inconsistent entity.</td><td> </td><td class="right"> internally inconsistent entity.</td><td class="lineno" valign="top"></td></tr>
285	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
286	<tr><td class="lineno" valign="top"></td><td class="left"> Clients MAY issue simple (non-subrange) GET requests with either weak</td><td> </td><td class="right"> Clients MAY issue simple (non-subrange) GET requests with either weak</td><td class="lineno" valign="top"></td></tr>
287	<tr><td class="lineno" valign="top"></td><td class="left"> validators or strong validators. Clients MUST NOT use weak</td><td> </td><td class="right"> validators or strong validators. Clients MUST NOT use weak</td><td class="lineno" valign="top"></td></tr>
288	<tr><td class="lineno" valign="top"></td><td class="left"> validators in other forms of request.</td><td> </td><td class="right"> validators in other forms of request.</td><td class="lineno" valign="top"></td></tr>
289	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
290	<tr><td><a name="diff0016" /></td></tr>
291	<tr><td class="lineno" valign="top"></td><td class="lblock"> The only function that <span class="delete">the</span> HTTP/1.1 <span class="delete">protocol</span> defines on validators is</td><td> </td><td class="rblock"> The only function that HTTP/1.1 defines on validators is comparison.</td><td class="lineno" valign="top"></td></tr>
292	<tr><td class="lineno" valign="top"></td><td class="lblock"> comparison. There are two validator comparison functions, depending</td><td> </td><td class="rblock"> There are two validator comparison functions, depending on whether</td><td class="lineno" valign="top"></td></tr>
293	<tr><td class="lineno" valign="top"></td><td class="lblock"> on whether the comparison context allows the use of weak validators</td><td> </td><td class="rblock"> the comparison context allows the use of weak validators or not:</td><td class="lineno" valign="top"></td></tr>
294	<tr><td class="lineno" valign="top"></td><td class="lblock"> or not:</td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
295	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
296	<tr><td class="lineno" valign="top"></td><td class="left"> o The strong comparison function: in order to be considered equal,</td><td> </td><td class="right"> o The strong comparison function: in order to be considered equal,</td><td class="lineno" valign="top"></td></tr>
297	<tr><td class="lineno" valign="top"></td><td class="left"> both validators MUST be identical in every way, and both MUST NOT</td><td> </td><td class="right"> both validators MUST be identical in every way, and both MUST NOT</td><td class="lineno" valign="top"></td></tr>
298	<tr><td class="lineno" valign="top"></td><td class="left"> be weak.</td><td> </td><td class="right"> be weak.</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"> o The weak comparison function: in order to be considered equal,</td><td> </td><td class="right"> o The weak comparison function: in order to be considered equal,</td><td class="lineno" valign="top"></td></tr>
301	<tr><td class="lineno" valign="top"></td><td class="left"> both validators MUST be identical in every way, but either or both</td><td> </td><td class="right"> both validators MUST be identical in every way, but either or both</td><td class="lineno" valign="top"></td></tr>
302	<tr><td class="lineno" valign="top"></td><td class="left"> of them MAY be tagged as "weak" without affecting the result.</td><td> </td><td class="right"> of them MAY be tagged as "weak" without affecting the result.</td><td class="lineno" valign="top"></td></tr>
303	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
304	<tr><td class="lineno" valign="top"></td><td class="left"> An entity tag is strong unless it is explicitly tagged as weak.</td><td> </td><td class="right"> An entity tag is strong unless it is explicitly tagged as weak.</td><td class="lineno" valign="top"></td></tr>
305	<tr><td><a name="diff0017" /></td></tr>
306	<tr><td class="lineno" valign="top"></td><td class="lblock"> Section <span class="delete">2</span> gives the syntax for entity tags.</td><td> </td><td class="rblock"> Section <span class="insert">3</span> gives the syntax for entity tags.</td><td class="lineno" valign="top"></td></tr>
307	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
308	<tr><td class="lineno" valign="top"></td><td class="left"> A Last-Modified time, when used as a validator in a request, is</td><td> </td><td class="right"> A Last-Modified time, when used as a validator in a request, is</td><td class="lineno" valign="top"></td></tr>
309	<tr><td class="lineno" valign="top"></td><td class="left"> implicitly weak unless it is possible to deduce that it is strong,</td><td> </td><td class="right"> implicitly weak unless it is possible to deduce that it is strong,</td><td class="lineno" valign="top"></td></tr>
310	<tr><td class="lineno" valign="top"></td><td class="left"> using the following rules:</td><td> </td><td class="right"> using the following rules:</td><td class="lineno" valign="top"></td></tr>
311	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
312	<tr><td class="lineno" valign="top"></td><td class="left"> o The validator is being compared by an origin server to the actual</td><td> </td><td class="right"> o The validator is being compared by an origin server to the actual</td><td class="lineno" valign="top"></td></tr>
313	<tr><td class="lineno" valign="top"></td><td class="left"> current validator for the entity and,</td><td> </td><td class="right"> current validator for the entity and,</td><td class="lineno" valign="top"></td></tr>
314	<tr><td><a name="diff0018" /></td></tr>
315	<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>
316	<tr><td class="lineno" valign="top"></td><td class="left"> o That origin server reliably knows that the associated entity did</td><td> </td><td class="right"> o That origin server reliably knows that the associated entity did</td><td class="lineno" valign="top"></td></tr>
317	<tr><td class="lineno" valign="top"></td><td class="left"> not change twice during the second covered by the presented</td><td> </td><td class="right"> not change twice during the second covered by the presented</td><td class="lineno" valign="top"></td></tr>
318	<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>
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"> or</td><td> </td><td class="right"> or</td><td class="lineno" valign="top"></td></tr>
321	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
322	<tr><td class="lineno" valign="top"></td><td class="left"> o The validator is about to be used by a client in an If-Modified-</td><td> </td><td class="right"> o The validator is about to be used by a client in an If-Modified-</td><td class="lineno" valign="top"></td></tr>
323	<tr><td class="lineno" valign="top"></td><td class="left"> Since or If-Unmodified-Since header, because the client has a</td><td> </td><td class="right"> Since or If-Unmodified-Since header, because the client has a</td><td class="lineno" valign="top"></td></tr>
324	<tr><td class="lineno" valign="top"></td><td class="left"> cache entry for the associated entity, and</td><td> </td><td class="right"> cache entry for the associated entity, and</td><td class="lineno" valign="top"></td></tr>
325	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
326	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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328	<tr><td class="lineno" valign="top"></td><td class="left"> described here.</td><td> </td><td class="right"> described here.</td><td class="lineno" valign="top"></td></tr>
329	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
330	<tr><td class="lineno" valign="top"></td><td class="left"> A cache or origin server receiving a conditional request, other than</td><td> </td><td class="right"> A cache or origin server receiving a conditional request, other than</td><td class="lineno" valign="top"></td></tr>
331	<tr><td class="lineno" valign="top"></td><td class="left"> a full-body GET request, MUST use the strong comparison function to</td><td> </td><td class="right"> a full-body GET request, MUST use the strong comparison function to</td><td class="lineno" valign="top"></td></tr>
332	<tr><td class="lineno" valign="top"></td><td class="left"> evaluate the condition.</td><td> </td><td class="right"> evaluate the condition.</td><td class="lineno" valign="top"></td></tr>
333	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
334	<tr><td class="lineno" valign="top"></td><td class="left"> These rules allow HTTP/1.1 caches and clients to safely perform sub-</td><td> </td><td class="right"> These rules allow HTTP/1.1 caches and clients to safely perform sub-</td><td class="lineno" valign="top"></td></tr>
335	<tr><td class="lineno" valign="top"></td><td class="left"> range retrievals on values that have been obtained from HTTP/1.0</td><td> </td><td class="right"> range retrievals on values that have been obtained from HTTP/1.0</td><td class="lineno" valign="top"></td></tr>
336	<tr><td class="lineno" valign="top"></td><td class="left"> servers.</td><td> </td><td class="right"> servers.</td><td class="lineno" valign="top"></td></tr>
337	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
338	<tr><td><a name="diff0019" /></td></tr>
339	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">5</span>. Rules for When to Use Entity Tags and Last-Modified Dates</td><td> </td><td class="rblock"><span class="insert">6</span>. Rules for When to Use Entity Tags and Last-Modified Dates</td><td class="lineno" valign="top"></td></tr>
340	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
341	<tr><td class="lineno" valign="top"></td><td class="left"> We adopt a set of rules and recommendations for origin servers,</td><td> </td><td class="right"> We adopt a set of rules and recommendations for origin servers,</td><td class="lineno" valign="top"></td></tr>
342	<tr><td class="lineno" valign="top"></td><td class="left"> clients, and caches regarding when various validator types ought to</td><td> </td><td class="right"> clients, and caches regarding when various validator types ought to</td><td class="lineno" valign="top"></td></tr>
343	<tr><td class="lineno" valign="top"></td><td class="left"> be used, and for what purposes.</td><td> </td><td class="right"> be used, and for what purposes.</td><td class="lineno" valign="top"></td></tr>
344	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
345	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP/1.1 origin servers:</td><td> </td><td class="right"> HTTP/1.1 origin servers:</td><td class="lineno" valign="top"></td></tr>
346	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
347	<tr><td class="lineno" valign="top"></td><td class="left"> o SHOULD send an entity tag validator unless it is not feasible to</td><td> </td><td class="right"> o SHOULD send an entity tag validator unless it is not feasible to</td><td class="lineno" valign="top"></td></tr>
348	<tr><td class="lineno" valign="top"></td><td class="left"> generate one.</td><td> </td><td class="right"> generate one.</td><td class="lineno" valign="top"></td></tr>
349	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
350	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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352	<tr><td class="lineno" valign="top"></td><td class="left"> conservative assumptions about the validators they receive.</td><td> </td><td class="right"> conservative assumptions about the validators they receive.</td><td class="lineno" valign="top"></td></tr>
353	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
354	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP/1.0 clients and caches will ignore entity tags. Generally,</td><td> </td><td class="right"> HTTP/1.0 clients and caches will ignore entity tags. Generally,</td><td class="lineno" valign="top"></td></tr>
355	<tr><td class="lineno" valign="top"></td><td class="left"> last-modified values received or used by these systems will</td><td> </td><td class="right"> last-modified values received or used by these systems will</td><td class="lineno" valign="top"></td></tr>
356	<tr><td class="lineno" valign="top"></td><td class="left"> support transparent and efficient caching, and so HTTP/1.1 origin</td><td> </td><td class="right"> support transparent and efficient caching, and so HTTP/1.1 origin</td><td class="lineno" valign="top"></td></tr>
357	<tr><td class="lineno" valign="top"></td><td class="left"> servers should provide Last-Modified values. In those rare cases</td><td> </td><td class="right"> servers should provide Last-Modified values. In those rare cases</td><td class="lineno" valign="top"></td></tr>
358	<tr><td class="lineno" valign="top"></td><td class="left"> where the use of a Last-Modified value as a validator by an</td><td> </td><td class="right"> where the use of a Last-Modified value as a validator by an</td><td class="lineno" valign="top"></td></tr>
359	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP/1.0 system could result in a serious problem, then HTTP/1.1</td><td> </td><td class="right"> HTTP/1.0 system could result in a serious problem, then HTTP/1.1</td><td class="lineno" valign="top"></td></tr>
360	<tr><td class="lineno" valign="top"></td><td class="left"> origin servers should not provide one.</td><td> </td><td class="right"> origin servers should not provide one.</td><td class="lineno" valign="top"></td></tr>
361	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
362	<tr><td><a name="diff0020" /></td></tr>
363	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>. Header Field Definitions</td><td> </td><td class="rblock"><span class="insert">7</span>. Header Field Definitions</td><td class="lineno" valign="top"></td></tr>
364	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
365	<tr><td class="lineno" valign="top"></td><td class="left"> 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>
366	<tr><td class="lineno" valign="top"></td><td class="left"> fields related to conditional requests.</td><td> </td><td class="right"> fields related to conditional requests.</td><td class="lineno" valign="top"></td></tr>
367	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
368	<tr><td class="lineno" valign="top"></td><td class="left"> For entity-header fields, both sender and recipient refer to either</td><td> </td><td class="right"> For entity-header fields, both sender and recipient refer to either</td><td class="lineno" valign="top"></td></tr>
369	<tr><td class="lineno" valign="top"></td><td class="left"> the client or the server, depending on who sends and who receives the</td><td> </td><td class="right"> the client or the server, depending on who sends and who receives the</td><td class="lineno" valign="top"></td></tr>
370	<tr><td class="lineno" valign="top"></td><td class="left"> entity.</td><td> </td><td class="right"> entity.</td><td class="lineno" valign="top"></td></tr>
371	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
372	<tr><td><a name="diff0021" /></td></tr>
373	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>.1. ETag</td><td> </td><td class="rblock"><span class="insert">7</span>.1. ETag</td><td class="lineno" valign="top"></td></tr>
374	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
375	<tr><td class="lineno" valign="top"></td><td class="left"> The ETag response-header field provides the current value of the</td><td> </td><td class="right"> The ETag response-header field provides the current value of the</td><td class="lineno" valign="top"></td></tr>
376	<tr><td class="lineno" valign="top"></td><td class="left"> entity tag for the requested variant. The headers used with entity</td><td> </td><td class="right"> entity tag for the requested variant. The headers used with entity</td><td class="lineno" valign="top"></td></tr>
377	<tr><td><a name="diff0022" /></td></tr>
378	<tr><td class="lineno" valign="top"></td><td class="lblock"> tags are described in Sections <span class="delete">6.2</span> and <span class="delete">6.4</span> of this document, and in</td><td> </td><td class="rblock"> tags are described in Sections <span class="insert">7.2</span> and <span class="insert">7.4</span> of this document, and in</td><td class="lineno" valign="top"></td></tr>
379	<tr><td class="lineno" valign="top"></td><td class="lblock"> Section <span class="delete">5.3</span> of [Part5]. The entity tag MAY be used for comparison</td><td> </td><td class="rblock"> Section <span class="insert">6.3</span> of [Part5]. The entity tag MAY be used for comparison</td><td class="lineno" valign="top"></td></tr>
380	<tr><td class="lineno" valign="top"></td><td class="lblock"> with other entities from the same resource (see Section <span class="delete">4).</span></td><td> </td><td class="rblock"> with other entities from the same resource (see Section <span class="insert">5).</span></td><td class="lineno" valign="top"></td></tr>
381	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
382	<tr><td class="lineno" valign="top"></td><td class="left"> ETag = "ETag" ":" entity-tag</td><td> </td><td class="right"> ETag = "ETag" ":" entity-tag</td><td class="lineno" valign="top"></td></tr>
383	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
384	<tr><td class="lineno" valign="top"></td><td class="left"> Examples:</td><td> </td><td class="right"> Examples:</td><td class="lineno" valign="top"></td></tr>
385	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
386	<tr><td class="lineno" valign="top"></td><td class="left"> ETag: "xyzzy"</td><td> </td><td class="right"> ETag: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
387	<tr><td class="lineno" valign="top"></td><td class="left"> ETag: W/"xyzzy"</td><td> </td><td class="right"> ETag: W/"xyzzy"</td><td class="lineno" valign="top"></td></tr>
388	<tr><td class="lineno" valign="top"></td><td class="left"> ETag: ""</td><td> </td><td class="right"> ETag: ""</td><td class="lineno" valign="top"></td></tr>
389	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
390	<tr><td><a name="diff0023" /></td></tr>
391	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6.2.</span> If-Match</td><td> </td><td class="rblock"> <span class="insert">The ETag response-header field value, an entity tag, provides for an</span></td><td class="lineno" valign="top"></td></tr>
392	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> "opaque" cache validator. This might allow more reliable validation</span></td><td class="lineno" valign="top"></td></tr>
393	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> in situations where it is inconvenient to store modification dates,</span></td><td class="lineno" valign="top"></td></tr>
394	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> where the one-second resolution of HTTP date values is not</span></td><td class="lineno" valign="top"></td></tr>
395	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> sufficient, or where the origin server wishes to avoid certain</span></td><td class="lineno" valign="top"></td></tr>
396	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> paradoxes that might arise from the use of modification dates.</span></td><td class="lineno" valign="top"></td></tr>
397	<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>
398	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> The principle behind entity tags is that only the service author</span></td><td class="lineno" valign="top"></td></tr>
399	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> knows the semantics of a resource well enough to select an</span></td><td class="lineno" valign="top"></td></tr>
400	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> appropriate cache validation mechanism, and the specification of any</span></td><td class="lineno" valign="top"></td></tr>
401	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> validator comparison function more complex than byte-equality would</span></td><td class="lineno" valign="top"></td></tr>
402	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> open up a can of worms. Thus, comparisons of any other headers</span></td><td class="lineno" valign="top"></td></tr>
403	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> (except Last-Modified, for compatibility with HTTP/1.0) are never</span></td><td class="lineno" valign="top"></td></tr>
404	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> used for purposes of validating a cache entry.</span></td><td class="lineno" valign="top"></td></tr>
405	<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>
406	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">7.2.</span> If-Match</td><td class="lineno" valign="top"></td></tr>
407	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
408	<tr><td class="lineno" valign="top"></td><td class="left"> The If-Match request-header field is used with a method to make it</td><td> </td><td class="right"> The If-Match request-header field is used with a method to make it</td><td class="lineno" valign="top"></td></tr>
409	<tr><td class="lineno" valign="top"></td><td class="left"> conditional. A client that has one or more entities previously</td><td> </td><td class="right"> conditional. A client that has one or more entities previously</td><td class="lineno" valign="top"></td></tr>
410	<tr><td class="lineno" valign="top"></td><td class="left"> obtained from the resource can verify that one of those entities is</td><td> </td><td class="right"> obtained from the resource can verify that one of those entities is</td><td class="lineno" valign="top"></td></tr>
411	<tr><td class="lineno" valign="top"></td><td class="left"> current by including a list of their associated entity tags in the</td><td> </td><td class="right"> current by including a list of their associated entity tags in 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"> If-Match header field. Entity tags are defined in Section <span class="delete">2</span>. The</td><td> </td><td class="rblock"> If-Match header field. Entity tags are defined in Section <span class="insert">3</span>. The</td><td class="lineno" valign="top"></td></tr>
414	<tr><td class="lineno" valign="top"></td><td class="left"> purpose of this feature is to allow efficient updates of cached</td><td> </td><td class="right"> purpose of this feature is to allow efficient updates of cached</td><td class="lineno" valign="top"></td></tr>
415	<tr><td class="lineno" valign="top"></td><td class="left"> information with a minimum amount of transaction overhead. It is</td><td> </td><td class="right"> information with a minimum amount of transaction overhead. It is</td><td class="lineno" valign="top"></td></tr>
416	<tr><td class="lineno" valign="top"></td><td class="left"> also used, on updating requests, to prevent inadvertent modification</td><td> </td><td class="right"> also used, on updating requests, to prevent inadvertent modification</td><td class="lineno" valign="top"></td></tr>
417	<tr><td class="lineno" valign="top"></td><td class="left"> of the wrong version of a resource. As a special case, the value ""</td><td> </td><td class="right"> of the wrong version of a resource. As a special case, the value ""</td><td class="lineno" valign="top"></td></tr>
418	<tr><td class="lineno" valign="top"></td><td class="left"> matches any current entity of the resource.</td><td> </td><td class="right"> matches any current entity of the resource.</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"> If-Match = "If-Match" ":" ( "" \| 1#entity-tag )</td><td> </td><td class="right"> If-Match = "If-Match" ":" ( "" \| 1#entity-tag )</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"> If any of the entity tags match the entity tag of the entity that</td><td> </td><td class="right"> If any of the entity tags match the entity tag of the entity that</td><td class="lineno" valign="top"></td></tr>
423	<tr><td class="lineno" valign="top"></td><td class="left"> would have been returned in the response to a similar GET request</td><td> </td><td class="right"> would have been returned in the response to a similar GET request</td><td class="lineno" valign="top"></td></tr>
424	<tr><td class="lineno" valign="top"></td><td class="left"> (without the If-Match header) on that resource, or if "" is given</td><td> </td><td class="right"> (without the If-Match header) on that resource, or if "" is given</td><td class="lineno" valign="top"></td></tr>
425	<tr><td class="lineno" valign="top"></td><td class="left"> and any current entity exists for that resource, then the server MAY</td><td> </td><td class="right"> and any current entity exists for that resource, then the server MAY</td><td class="lineno" valign="top"></td></tr>
426	<tr><td class="lineno" valign="top"></td><td class="left"> perform the requested method as if the If-Match header field did not</td><td> </td><td class="right"> perform the requested method as if the If-Match header field did not</td><td class="lineno" valign="top"></td></tr>
427	<tr><td class="lineno" valign="top"></td><td class="left"> exist.</td><td> </td><td class="right"> exist.</td><td class="lineno" valign="top"></td></tr>
428	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
429	<tr><td><a name="diff0025" /></td></tr>
430	<tr><td class="lineno" valign="top"></td><td class="lblock"> A server MUST use the strong comparison function (see Section <span class="delete">4</span>) to</td><td> </td><td class="rblock"> A server MUST use the strong comparison function (see Section <span class="insert">5</span>) to</td><td class="lineno" valign="top"></td></tr>
431	<tr><td class="lineno" valign="top"></td><td class="left"> compare the entity tags in If-Match.</td><td> </td><td class="right"> compare the entity tags in If-Match.</td><td class="lineno" valign="top"></td></tr>
432	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
433	<tr><td class="lineno" valign="top"></td><td class="left"> If none of the entity tags match, or if "" is given and no current</td><td> </td><td class="right"> If none of the entity tags match, or if "" is given and no current</td><td class="lineno" valign="top"></td></tr>
434	<tr><td class="lineno" valign="top"></td><td class="left"> entity exists, the server MUST NOT perform the requested method, and</td><td> </td><td class="right"> entity exists, the server MUST NOT perform the requested method, and</td><td class="lineno" valign="top"></td></tr>
435	<tr><td class="lineno" valign="top"></td><td class="left"> MUST return a 412 (Precondition Failed) response. This behavior is</td><td> </td><td class="right"> MUST return a 412 (Precondition Failed) response. This behavior is</td><td class="lineno" valign="top"></td></tr>
436	<tr><td class="lineno" valign="top"></td><td class="left"> most useful when the client wants to prevent an updating method, such</td><td> </td><td class="right"> most useful when the client wants to prevent an updating method, such</td><td class="lineno" valign="top"></td></tr>
437	<tr><td class="lineno" valign="top"></td><td class="left"> as PUT, from modifying a resource that has changed since the client</td><td> </td><td class="right"> as PUT, from modifying a resource that has changed since the client</td><td class="lineno" valign="top"></td></tr>
438	<tr><td class="lineno" valign="top"></td><td class="left"> last retrieved it.</td><td> </td><td class="right"> last retrieved it.</td><td class="lineno" valign="top"></td></tr>
439	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
440	<tr><td class="lineno" valign="top"></td><td class="left"> If the request would, without the If-Match header field, result in</td><td> </td><td class="right"> If the request would, without the If-Match header field, result in</td><td class="lineno" valign="top"></td></tr>
441	<tr><td class="lineno" valign="top"></td><td class="left"> anything other than a 2xx or 412 status, then the If-Match header</td><td> </td><td class="right"> anything other than a 2xx or 412 status, then the If-Match header</td><td class="lineno" valign="top"></td></tr>
442	<tr><td class="lineno" valign="top"></td><td class="left"> MUST be ignored.</td><td> </td><td class="right"> MUST be ignored.</td><td class="lineno" valign="top"></td></tr>
443	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
444	<tr><td class="lineno" valign="top"></td><td class="left"> The meaning of "If-Match: " is that the method SHOULD be performed</td><td> </td><td class="right"> The meaning of "If-Match: " is that the method SHOULD be performed</td><td class="lineno" valign="top"></td></tr>
445	<tr><td class="lineno" valign="top"></td><td class="left"> if the representation selected by the origin server (or by a cache,</td><td> </td><td class="right"> if the representation selected by the origin server (or by a cache,</td><td class="lineno" valign="top"></td></tr>
446	<tr><td><a name="diff0026" /></td></tr>
447	<tr><td class="lineno" valign="top"></td><td class="lblock"> possibly using the Vary mechanism, see Section 1<span class="delete">5</span>.5 of [Part6])</td><td> </td><td class="rblock"> possibly using the Vary mechanism, see Section 1<span class="insert">6</span>.5 of [Part6])</td><td class="lineno" valign="top"></td></tr>
448	<tr><td class="lineno" valign="top"></td><td class="left"> exists, and MUST NOT be performed if the representation does not</td><td> </td><td class="right"> exists, and MUST NOT be performed if the representation does not</td><td class="lineno" valign="top"></td></tr>
449	<tr><td class="lineno" valign="top"></td><td class="left"> exist.</td><td> </td><td class="right"> exist.</td><td class="lineno" valign="top"></td></tr>
450	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
451	<tr><td class="lineno" valign="top"></td><td class="left"> A request intended to update a resource (e.g., a PUT) MAY include an</td><td> </td><td class="right"> A request intended to update a resource (e.g., a PUT) MAY include an</td><td class="lineno" valign="top"></td></tr>
452	<tr><td class="lineno" valign="top"></td><td class="left"> If-Match header field to signal that the request method MUST NOT be</td><td> </td><td class="right"> If-Match header field to signal that the request method MUST NOT be</td><td class="lineno" valign="top"></td></tr>
453	<tr><td class="lineno" valign="top"></td><td class="left"> applied if the entity corresponding to the If-Match value (a single</td><td> </td><td class="right"> applied if the entity corresponding to the If-Match value (a single</td><td class="lineno" valign="top"></td></tr>
454	<tr><td class="lineno" valign="top"></td><td class="left"> entity tag) is no longer a representation of that resource. This</td><td> </td><td class="right"> entity tag) is no longer a representation of that resource. This</td><td class="lineno" valign="top"></td></tr>
455	<tr><td class="lineno" valign="top"></td><td class="left"> allows the user to indicate that they do not wish the request to be</td><td> </td><td class="right"> allows the user to indicate that they do not wish the request to be</td><td class="lineno" valign="top"></td></tr>
456	<tr><td class="lineno" valign="top"></td><td class="left"> successful if the resource has been changed without their knowledge.</td><td> </td><td class="right"> successful if the resource has been changed without their knowledge.</td><td class="lineno" valign="top"></td></tr>
457	<tr><td><a name="diff0027" /></td></tr>
458	<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>
459	<tr><td class="lineno" valign="top"></td><td class="left"> Examples:</td><td> </td><td class="right"> Examples:</td><td class="lineno" valign="top"></td></tr>
460	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
461	<tr><td class="lineno" valign="top"></td><td class="left"> If-Match: "xyzzy"</td><td> </td><td class="right"> If-Match: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
462	<tr><td class="lineno" valign="top"></td><td class="left"> If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td> </td><td class="right"> If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td class="lineno" valign="top"></td></tr>
463	<tr><td class="lineno" valign="top"></td><td class="left"> If-Match: </td><td> </td><td class="right"> If-Match: </td><td class="lineno" valign="top"></td></tr>
464	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
465	<tr><td class="lineno" valign="top"></td><td class="left"> The result of a request having both an If-Match header field and</td><td> </td><td class="right"> The result of a request having both an If-Match header field and</td><td class="lineno" valign="top"></td></tr>
466	<tr><td class="lineno" valign="top"></td><td class="left"> either an If-None-Match or an If-Modified-Since header fields is</td><td> </td><td class="right"> either an If-None-Match or an If-Modified-Since header fields is</td><td class="lineno" valign="top"></td></tr>
467	<tr><td class="lineno" valign="top"></td><td class="left"> undefined by this specification.</td><td> </td><td class="right"> undefined by this specification.</td><td class="lineno" valign="top"></td></tr>
468	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
469	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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471	<tr><td class="lineno" valign="top"></td><td class="left"> Examples:</td><td> </td><td class="right"> Examples:</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 class="lineno" valign="top"></td><td class="left"> If-Match: "xyzzy"</td><td> </td><td class="right"> If-Match: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
474	<tr><td class="lineno" valign="top"></td><td class="left"> If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td> </td><td class="right"> If-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td class="lineno" valign="top"></td></tr>
475	<tr><td class="lineno" valign="top"></td><td class="left"> If-Match: </td><td> </td><td class="right"> If-Match: </td><td class="lineno" valign="top"></td></tr>
476	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
477	<tr><td class="lineno" valign="top"></td><td class="left"> The result of a request having both an If-Match header field and</td><td> </td><td class="right"> The result of a request having both an If-Match header field and</td><td class="lineno" valign="top"></td></tr>
478	<tr><td class="lineno" valign="top"></td><td class="left"> either an If-None-Match or an If-Modified-Since header fields is</td><td> </td><td class="right"> either an If-None-Match or an If-Modified-Since header fields is</td><td class="lineno" valign="top"></td></tr>
479	<tr><td class="lineno" valign="top"></td><td class="left"> undefined by this specification.</td><td> </td><td class="right"> undefined by this specification.</td><td class="lineno" valign="top"></td></tr>
480	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
481	<tr><td><a name="diff0028" /></td></tr>
482	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>.3. If-Modified-Since</td><td> </td><td class="rblock"><span class="insert">7</span>.3. If-Modified-Since</td><td class="lineno" valign="top"></td></tr>
483	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
484	<tr><td class="lineno" valign="top"></td><td class="left"> The If-Modified-Since request-header field is used with a method to</td><td> </td><td class="right"> The If-Modified-Since request-header field is used with a method to</td><td class="lineno" valign="top"></td></tr>
485	<tr><td class="lineno" valign="top"></td><td class="left"> make it conditional: if the requested variant has not been modified</td><td> </td><td class="right"> make it conditional: if the requested variant has not been modified</td><td class="lineno" valign="top"></td></tr>
486	<tr><td class="lineno" valign="top"></td><td class="left"> since the time specified in this field, an entity will not be</td><td> </td><td class="right"> since the time specified in this field, an entity will not be</td><td class="lineno" valign="top"></td></tr>
487	<tr><td class="lineno" valign="top"></td><td class="left"> returned from the server; instead, a 304 (Not Modified) response will</td><td> </td><td class="right"> returned from the server; instead, a 304 (Not Modified) response will</td><td class="lineno" valign="top"></td></tr>
488	<tr><td class="lineno" valign="top"></td><td class="left"> be returned without any message-body.</td><td> </td><td class="right"> be returned without any message-body.</td><td class="lineno" valign="top"></td></tr>
489	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
490	<tr><td class="lineno" valign="top"></td><td class="left"> If-Modified-Since = "If-Modified-Since" ":" HTTP-date</td><td> </td><td class="right"> If-Modified-Since = "If-Modified-Since" ":" HTTP-date</td><td class="lineno" valign="top"></td></tr>
491	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
492	<tr><td class="lineno" valign="top"></td><td class="left"> An example of the field is:</td><td> </td><td class="right"> An example of the field is:</td><td class="lineno" valign="top"></td></tr>
493	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
494	<tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 13, line 21</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 13, line 50</em></th><td></td></tr>
495	<tr><td class="lineno" valign="top"></td><td class="left"> date, the response is exactly the same as for a normal GET.</td><td> </td><td class="right"> date, the response is exactly the same as for a normal GET.</td><td class="lineno" valign="top"></td></tr>
496	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
497	<tr><td class="lineno" valign="top"></td><td class="left"> 3. If the variant has not been modified since a valid If-Modified-</td><td> </td><td class="right"> 3. If the variant has not been modified since a valid If-Modified-</td><td class="lineno" valign="top"></td></tr>
498	<tr><td class="lineno" valign="top"></td><td class="left"> Since date, the server SHOULD return a 304 (Not Modified)</td><td> </td><td class="right"> Since date, the server SHOULD return a 304 (Not Modified)</td><td class="lineno" valign="top"></td></tr>
499	<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>
500	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
501	<tr><td class="lineno" valign="top"></td><td class="left"> The purpose of this feature is to allow efficient updates of cached</td><td> </td><td class="right"> The purpose of this feature is to allow efficient updates of cached</td><td class="lineno" valign="top"></td></tr>
502	<tr><td class="lineno" valign="top"></td><td class="left"> information with a minimum amount of transaction overhead.</td><td> </td><td class="right"> information with a minimum amount of transaction overhead.</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 class="lineno" valign="top"></td><td class="left"> Note: The Range request-header field modifies the meaning of If-</td><td> </td><td class="right"> Note: The Range request-header field modifies the meaning of If-</td><td class="lineno" valign="top"></td></tr>
505	<tr><td><a name="diff0029" /></td></tr>
506	<tr><td class="lineno" valign="top"></td><td class="lblock"> Modified-Since; see Section <span class="delete">5</span>.4 of [Part5] for full details.</td><td> </td><td class="rblock"> Modified-Since; see Section <span class="insert">6</span>.4 of [Part5] for full details.</td><td class="lineno" valign="top"></td></tr>
507	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
508	<tr><td class="lineno" valign="top"></td><td class="left"> Note: If-Modified-Since times are interpreted by the server, whose</td><td> </td><td class="right"> Note: If-Modified-Since times are interpreted by the server, whose</td><td class="lineno" valign="top"></td></tr>
509	<tr><td class="lineno" valign="top"></td><td class="left"> clock might not be synchronized with the client.</td><td> </td><td class="right"> clock might not be synchronized with the client.</td><td class="lineno" valign="top"></td></tr>
510	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
511	<tr><td class="lineno" valign="top"></td><td class="left"> Note: When handling an If-Modified-Since header field, some</td><td> </td><td class="right"> Note: When handling an If-Modified-Since header field, some</td><td class="lineno" valign="top"></td></tr>
512	<tr><td class="lineno" valign="top"></td><td class="left"> servers will use an exact date comparison function, rather than a</td><td> </td><td class="right"> servers will use an exact date comparison function, rather than a</td><td class="lineno" valign="top"></td></tr>
513	<tr><td class="lineno" valign="top"></td><td class="left"> less-than function, for deciding whether to send a 304 (Not</td><td> </td><td class="right"> less-than function, for deciding whether to send a 304 (Not</td><td class="lineno" valign="top"></td></tr>
514	<tr><td class="lineno" valign="top"></td><td class="left"> Modified) response. To get best results when sending an If-</td><td> </td><td class="right"> Modified) response. To get best results when sending an If-</td><td class="lineno" valign="top"></td></tr>
515	<tr><td class="lineno" valign="top"></td><td class="left"> Modified-Since header field for cache validation, clients are</td><td> </td><td class="right"> Modified-Since header field for cache validation, clients are</td><td class="lineno" valign="top"></td></tr>
516	<tr><td class="lineno" valign="top"></td><td class="left"> advised to use the exact date string received in a previous Last-</td><td> </td><td class="right"> advised to use the exact date string received in a previous Last-</td><td class="lineno" valign="top"></td></tr>
517	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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519	<tr><td class="lineno" valign="top"></td><td class="left"> possibility of clock-skew-related problems if the If-Modified-</td><td> </td><td class="right"> possibility of clock-skew-related problems if the If-Modified-</td><td class="lineno" valign="top"></td></tr>
520	<tr><td class="lineno" valign="top"></td><td class="left"> Since date is derived from the client's clock without correction</td><td> </td><td class="right"> Since date is derived from the client's clock without correction</td><td class="lineno" valign="top"></td></tr>
521	<tr><td class="lineno" valign="top"></td><td class="left"> to the server's clock. Corrections for different time bases</td><td> </td><td class="right"> to the server's clock. Corrections for different time bases</td><td class="lineno" valign="top"></td></tr>
522	<tr><td class="lineno" valign="top"></td><td class="left"> between client and server are at best approximate due to network</td><td> </td><td class="right"> between client and server are at best approximate due to network</td><td class="lineno" valign="top"></td></tr>
523	<tr><td class="lineno" valign="top"></td><td class="left"> latency.</td><td> </td><td class="right"> latency.</td><td class="lineno" valign="top"></td></tr>
524	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
525	<tr><td class="lineno" valign="top"></td><td class="left"> The result of a request having both an If-Modified-Since header field</td><td> </td><td class="right"> The result of a request having both an If-Modified-Since header field</td><td class="lineno" valign="top"></td></tr>
526	<tr><td class="lineno" valign="top"></td><td class="left"> and either an If-Match or an If-Unmodified-Since header fields is</td><td> </td><td class="right"> and either an If-Match or an If-Unmodified-Since header fields is</td><td class="lineno" valign="top"></td></tr>
527	<tr><td class="lineno" valign="top"></td><td class="left"> undefined by this specification.</td><td> </td><td class="right"> undefined by this specification.</td><td class="lineno" valign="top"></td></tr>
528	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
529	<tr><td><a name="diff0030" /></td></tr>
530	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>.4. If-None-Match</td><td> </td><td class="rblock"><span class="insert">7</span>.4. If-None-Match</td><td class="lineno" valign="top"></td></tr>
531	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
532	<tr><td class="lineno" valign="top"></td><td class="left"> The If-None-Match request-header field is used with a method to make</td><td> </td><td class="right"> The If-None-Match request-header field is used with a method to make</td><td class="lineno" valign="top"></td></tr>
533	<tr><td class="lineno" valign="top"></td><td class="left"> it conditional. A client that has one or more entities previously</td><td> </td><td class="right"> it conditional. A client that has one or more entities previously</td><td class="lineno" valign="top"></td></tr>
534	<tr><td class="lineno" valign="top"></td><td class="left"> obtained from the resource can verify that none of those entities is</td><td> </td><td class="right"> obtained from the resource can verify that none of those entities is</td><td class="lineno" valign="top"></td></tr>
535	<tr><td class="lineno" valign="top"></td><td class="left"> current by including a list of their associated entity tags in the</td><td> </td><td class="right"> current by including a list of their associated entity tags in the</td><td class="lineno" valign="top"></td></tr>
536	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match header field. The purpose of this feature is to allow</td><td> </td><td class="right"> If-None-Match header field. The purpose of this feature is to allow</td><td class="lineno" valign="top"></td></tr>
537	<tr><td class="lineno" valign="top"></td><td class="left"> efficient updates of cached information with a minimum amount of</td><td> </td><td class="right"> efficient updates of cached information with a minimum amount of</td><td class="lineno" valign="top"></td></tr>
538	<tr><td class="lineno" valign="top"></td><td class="left"> transaction overhead. It is also used to prevent a method (e.g.</td><td> </td><td class="right"> transaction overhead. It is also used to prevent a method (e.g.</td><td class="lineno" valign="top"></td></tr>
539	<tr><td class="lineno" valign="top"></td><td class="left"> PUT) from inadvertently modifying an existing resource when the</td><td> </td><td class="right"> PUT) from inadvertently modifying an existing resource when the</td><td class="lineno" valign="top"></td></tr>
540	<tr><td class="lineno" valign="top"></td><td class="left"> client believes that the resource does not exist.</td><td> </td><td class="right"> client believes that the resource does not exist.</td><td class="lineno" valign="top"></td></tr>
541	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
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543	<tr><td class="lineno" valign="top"></td><td class="left"> given and any current entity exists for that resource, then the</td><td> </td><td class="right"> given and any current entity exists for that resource, then the</td><td class="lineno" valign="top"></td></tr>
544	<tr><td class="lineno" valign="top"></td><td class="left"> server MUST NOT perform the requested method, unless required to do</td><td> </td><td class="right"> server MUST NOT perform the requested method, unless required to do</td><td class="lineno" valign="top"></td></tr>
545	<tr><td class="lineno" valign="top"></td><td class="left"> so because the resource's modification date fails to match that</td><td> </td><td class="right"> so because the resource's modification date fails to match that</td><td class="lineno" valign="top"></td></tr>
546	<tr><td class="lineno" valign="top"></td><td class="left"> supplied in an If-Modified-Since header field in the request.</td><td> </td><td class="right"> supplied in an If-Modified-Since header field in the request.</td><td class="lineno" valign="top"></td></tr>
547	<tr><td class="lineno" valign="top"></td><td class="left"> Instead, if the request method was GET or HEAD, the server SHOULD</td><td> </td><td class="right"> Instead, if the request method was GET or HEAD, the server SHOULD</td><td class="lineno" valign="top"></td></tr>
548	<tr><td class="lineno" valign="top"></td><td class="left"> respond with a 304 (Not Modified) response, including the cache-</td><td> </td><td class="right"> respond with a 304 (Not Modified) response, including the cache-</td><td class="lineno" valign="top"></td></tr>
549	<tr><td class="lineno" valign="top"></td><td class="left"> related header fields (particularly ETag) of one of the entities that</td><td> </td><td class="right"> related header fields (particularly ETag) of one of the entities that</td><td class="lineno" valign="top"></td></tr>
550	<tr><td class="lineno" valign="top"></td><td class="left"> matched. For all other request methods, the server MUST respond with</td><td> </td><td class="right"> matched. For all other request methods, the server MUST respond with</td><td class="lineno" valign="top"></td></tr>
551	<tr><td class="lineno" valign="top"></td><td class="left"> a status of 412 (Precondition Failed).</td><td> </td><td class="right"> a status of 412 (Precondition Failed).</td><td class="lineno" valign="top"></td></tr>
552	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
553	<tr><td><a name="diff0031" /></td></tr>
554	<tr><td class="lineno" valign="top"></td><td class="lblock"> See Section <span class="delete">4</span> for rules on how to determine if two entities tags</td><td> </td><td class="rblock"> See Section <span class="insert">5</span> for rules on how to determine if two entities tags</td><td class="lineno" valign="top"></td></tr>
555	<tr><td class="lineno" valign="top"></td><td class="left"> match. The weak comparison function can only be used with GET or</td><td> </td><td class="right"> match. The weak comparison function can only be used with GET or</td><td class="lineno" valign="top"></td></tr>
556	<tr><td class="lineno" valign="top"></td><td class="left"> HEAD requests.</td><td> </td><td class="right"> HEAD requests.</td><td class="lineno" valign="top"></td></tr>
557	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
558	<tr><td class="lineno" valign="top"></td><td class="left"> If none of the entity tags match, then the server MAY perform the</td><td> </td><td class="right"> If none of the entity tags match, then the server MAY perform the</td><td class="lineno" valign="top"></td></tr>
559	<tr><td class="lineno" valign="top"></td><td class="left"> requested method as if the If-None-Match header field did not exist,</td><td> </td><td class="right"> requested method as if the If-None-Match header field did not exist,</td><td class="lineno" valign="top"></td></tr>
560	<tr><td class="lineno" valign="top"></td><td class="left"> but MUST also ignore any If-Modified-Since header field(s) in the</td><td> </td><td class="right"> but MUST also ignore any If-Modified-Since header field(s) in the</td><td class="lineno" valign="top"></td></tr>
561	<tr><td class="lineno" valign="top"></td><td class="left"> request. That is, if no entity tags match, then the server MUST NOT</td><td> </td><td class="right"> request. That is, if no entity tags match, then the server MUST NOT</td><td class="lineno" valign="top"></td></tr>
562	<tr><td class="lineno" valign="top"></td><td class="left"> return a 304 (Not Modified) response.</td><td> </td><td class="right"> return a 304 (Not Modified) response.</td><td class="lineno" valign="top"></td></tr>
563	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
564	<tr><td class="lineno" valign="top"></td><td class="left"> If the request would, without the If-None-Match header field, result</td><td> </td><td class="right"> If the request would, without the If-None-Match header field, result</td><td class="lineno" valign="top"></td></tr>
565	<tr><td class="lineno" valign="top"></td><td class="left"> in anything other than a 2xx or 304 status, then the If-None-Match</td><td> </td><td class="right"> in anything other than a 2xx or 304 status, then the If-None-Match</td><td class="lineno" valign="top"></td></tr>
566	<tr><td><a name="diff0032" /></td></tr>
567	<tr><td class="lineno" valign="top"></td><td class="lblock"> header MUST be ignored. (See Section <span class="delete">5</span> for a discussion of server</td><td> </td><td class="rblock"> header MUST be ignored. (See Section <span class="insert">6</span> for a discussion of server</td><td class="lineno" valign="top"></td></tr>
568	<tr><td class="lineno" valign="top"></td><td class="left"> behavior when both If-Modified-Since and If-None-Match appear in the</td><td> </td><td class="right"> behavior when both If-Modified-Since and If-None-Match appear in the</td><td class="lineno" valign="top"></td></tr>
569	<tr><td class="lineno" valign="top"></td><td class="left"> same request.)</td><td> </td><td class="right"> same request.)</td><td class="lineno" valign="top"></td></tr>
570	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
571	<tr><td class="lineno" valign="top"></td><td class="left"> The meaning of "If-None-Match: " is that the method MUST NOT be</td><td> </td><td class="right"> The meaning of "If-None-Match: " is that the method MUST NOT be</td><td class="lineno" valign="top"></td></tr>
572	<tr><td class="lineno" valign="top"></td><td class="left"> performed if the representation selected by the origin server (or by</td><td> </td><td class="right"> performed if the representation selected by the origin server (or by</td><td class="lineno" valign="top"></td></tr>
573	<tr><td><a name="diff0033" /></td></tr>
574	<tr><td class="lineno" valign="top"></td><td class="lblock"> a cache, possibly using the Vary mechanism, see Section 1<span class="delete">5</span>.5 of</td><td> </td><td class="rblock"> a cache, possibly using the Vary mechanism, see Section 1<span class="insert">6</span>.5 of</td><td class="lineno" valign="top"></td></tr>
575	<tr><td class="lineno" valign="top"></td><td class="left"> [Part6]) exists, and SHOULD be performed if the representation does</td><td> </td><td class="right"> [Part6]) exists, and SHOULD be performed if the representation does</td><td class="lineno" valign="top"></td></tr>
576	<tr><td class="lineno" valign="top"></td><td class="left"> not exist. This feature is intended to be useful in preventing races</td><td> </td><td class="right"> not exist. This feature is intended to be useful in preventing races</td><td class="lineno" valign="top"></td></tr>
577	<tr><td class="lineno" valign="top"></td><td class="left"> between PUT operations.</td><td> </td><td class="right"> between PUT operations.</td><td class="lineno" valign="top"></td></tr>
578	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
579	<tr><td class="lineno" valign="top"></td><td class="left"> Examples:</td><td> </td><td class="right"> Examples:</td><td class="lineno" valign="top"></td></tr>
580	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
581	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match: "xyzzy"</td><td> </td><td class="right"> If-None-Match: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
582	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match: W/"xyzzy"</td><td> </td><td class="right"> If-None-Match: W/"xyzzy"</td><td class="lineno" valign="top"></td></tr>
583	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td> </td><td class="right"> If-None-Match: "xyzzy", "r2d2xxxx", "c3piozzzz"</td><td class="lineno" valign="top"></td></tr>
584	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match: W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz"</td><td> </td><td class="right"> If-None-Match: W/"xyzzy", W/"r2d2xxxx", W/"c3piozzzz"</td><td class="lineno" valign="top"></td></tr>
585	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match: </td><td> </td><td class="right"> If-None-Match: </td><td class="lineno" valign="top"></td></tr>
586	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
587	<tr><td class="lineno" valign="top"></td><td class="left"> The result of a request having both an If-None-Match header field and</td><td> </td><td class="right"> The result of a request having both an If-None-Match header field and</td><td class="lineno" valign="top"></td></tr>
588	<tr><td class="lineno" valign="top"></td><td class="left"> either an If-Match or an If-Unmodified-Since header fields is</td><td> </td><td class="right"> either an If-Match or an If-Unmodified-Since header fields is</td><td class="lineno" valign="top"></td></tr>
589	<tr><td class="lineno" valign="top"></td><td class="left"> undefined by this specification.</td><td> </td><td class="right"> undefined by this specification.</td><td class="lineno" valign="top"></td></tr>
590	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
591	<tr><td><a name="diff0034" /></td></tr>
592	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>.5. If-Unmodified-Since</td><td> </td><td class="rblock"><span class="insert">7</span>.5. If-Unmodified-Since</td><td class="lineno" valign="top"></td></tr>
593	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
594	<tr><td class="lineno" valign="top"></td><td class="left"> The If-Unmodified-Since request-header field is used with a method to</td><td> </td><td class="right"> The If-Unmodified-Since request-header field is used with a method to</td><td class="lineno" valign="top"></td></tr>
595	<tr><td class="lineno" valign="top"></td><td class="left"> make it conditional. If the requested resource has not been modified</td><td> </td><td class="right"> make it conditional. If the requested resource has not been modified</td><td class="lineno" valign="top"></td></tr>
596	<tr><td class="lineno" valign="top"></td><td class="left"> since the time specified in this field, the server SHOULD perform the</td><td> </td><td class="right"> since the time specified in this field, the server SHOULD perform the</td><td class="lineno" valign="top"></td></tr>
597	<tr><td class="lineno" valign="top"></td><td class="left"> requested operation as if the If-Unmodified-Since header were not</td><td> </td><td class="right"> requested operation as if the If-Unmodified-Since header were not</td><td class="lineno" valign="top"></td></tr>
598	<tr><td class="lineno" valign="top"></td><td class="left"> present.</td><td> </td><td class="right"> present.</td><td class="lineno" valign="top"></td></tr>
599	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
600	<tr><td class="lineno" valign="top"></td><td class="left"> If the requested variant has been modified since the specified time,</td><td> </td><td class="right"> If the requested variant has been modified since the specified time,</td><td class="lineno" valign="top"></td></tr>
601	<tr><td class="lineno" valign="top"></td><td class="left"> the server MUST NOT perform the requested operation, and MUST return</td><td> </td><td class="right"> the server MUST NOT perform the requested operation, and MUST return</td><td class="lineno" valign="top"></td></tr>
602	<tr><td class="lineno" valign="top"></td><td class="left"> a 412 (Precondition Failed).</td><td> </td><td class="right"> a 412 (Precondition Failed).</td><td class="lineno" valign="top"></td></tr>
603	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
604	<tr bgcolor="gray" ><td></td><th><a name="part-l14" /><small>skipping to change at</small><em> page 16, line 5</em></th><th> </th><th><a name="part-r14" /><small>skipping to change at</small><em> page 16, line 33</em></th><td></td></tr>
605	<tr><td class="lineno" valign="top"></td><td class="left"> If the request normally (i.e., without the If-Unmodified-Since</td><td> </td><td class="right"> If the request normally (i.e., without the If-Unmodified-Since</td><td class="lineno" valign="top"></td></tr>
606	<tr><td class="lineno" valign="top"></td><td class="left"> header) would result in anything other than a 2xx or 412 status, the</td><td> </td><td class="right"> header) would result in anything other than a 2xx or 412 status, the</td><td class="lineno" valign="top"></td></tr>
607	<tr><td class="lineno" valign="top"></td><td class="left"> If-Unmodified-Since header SHOULD be ignored.</td><td> </td><td class="right"> If-Unmodified-Since header SHOULD be ignored.</td><td class="lineno" valign="top"></td></tr>
608	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
609	<tr><td class="lineno" valign="top"></td><td class="left"> If the specified date is invalid, the header is ignored.</td><td> </td><td class="right"> If the specified date is invalid, the header is ignored.</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"> The result of a request having both an If-Unmodified-Since header</td><td> </td><td class="right"> The result of a request having both an If-Unmodified-Since header</td><td class="lineno" valign="top"></td></tr>
612	<tr><td class="lineno" valign="top"></td><td class="left"> field and either an If-None-Match or an If-Modified-Since header</td><td> </td><td class="right"> field and either an If-None-Match or an If-Modified-Since header</td><td class="lineno" valign="top"></td></tr>
613	<tr><td class="lineno" valign="top"></td><td class="left"> fields is undefined by this specification.</td><td> </td><td class="right"> fields is undefined by this specification.</td><td class="lineno" valign="top"></td></tr>
614	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
615	<tr><td><a name="diff0035" /></td></tr>
616	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>.6. Last-Modified</td><td> </td><td class="rblock"><span class="insert">7</span>.6. Last-Modified</td><td class="lineno" valign="top"></td></tr>
617	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
618	<tr><td class="lineno" valign="top"></td><td class="left"> The Last-Modified entity-header field indicates the date and time at</td><td> </td><td class="right"> The Last-Modified entity-header field indicates the date and time at</td><td class="lineno" valign="top"></td></tr>
619	<tr><td class="lineno" valign="top"></td><td class="left"> which the origin server believes the variant was last modified.</td><td> </td><td class="right"> which the origin server believes the variant was last modified.</td><td class="lineno" valign="top"></td></tr>
620	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
621	<tr><td class="lineno" valign="top"></td><td class="left"> Last-Modified = "Last-Modified" ":" HTTP-date</td><td> </td><td class="right"> Last-Modified = "Last-Modified" ":" HTTP-date</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"> An example of its use is</td><td> </td><td class="right"> An example of its use is</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"> Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT</td><td> </td><td class="right"> Last-Modified: Tue, 15 Nov 1994 12:45:26 GMT</td><td class="lineno" valign="top"></td></tr>
626	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
627	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
628	<tr bgcolor="gray" ><td></td><th><a name="part-l15" /><small>skipping to change at</small><em> page 16, line 39</em></th><th> </th><th><a name="part-r15" /><small>skipping to change at</small><em> page 17, line 19</em></th><td></td></tr>
629	<tr><td class="lineno" valign="top"></td><td class="left"> origination date.</td><td> </td><td class="right"> origination date.</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"> An origin server SHOULD obtain the Last-Modified value of the entity</td><td> </td><td class="right"> An origin server SHOULD obtain the Last-Modified value of the entity</td><td class="lineno" valign="top"></td></tr>
632	<tr><td class="lineno" valign="top"></td><td class="left"> as close as possible to the time that it generates the Date value of</td><td> </td><td class="right"> as close as possible to the time that it generates the Date value of</td><td class="lineno" valign="top"></td></tr>
633	<tr><td class="lineno" valign="top"></td><td class="left"> its response. This allows a recipient to make an accurate assessment</td><td> </td><td class="right"> its response. This allows a recipient to make an accurate assessment</td><td class="lineno" valign="top"></td></tr>
634	<tr><td class="lineno" valign="top"></td><td class="left"> of the entity's modification time, especially if the entity changes</td><td> </td><td class="right"> of the entity's modification time, especially if the entity changes</td><td class="lineno" valign="top"></td></tr>
635	<tr><td class="lineno" valign="top"></td><td class="left"> near the time that the response is generated.</td><td> </td><td class="right"> near the time that the response is generated.</td><td class="lineno" valign="top"></td></tr>
636	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
637	<tr><td class="lineno" valign="top"></td><td class="left"> HTTP/1.1 servers SHOULD send Last-Modified whenever feasible.</td><td> </td><td class="right"> HTTP/1.1 servers SHOULD send Last-Modified whenever feasible.</td><td class="lineno" valign="top"></td></tr>
638	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
639	<tr><td><a name="diff0036" /></td></tr>
640	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7. IANA Considerations</span></td><td> </td><td class="rblock"> <span class="insert">The Last-Modified entity-header field value is often used as a cache</span></td><td class="lineno" valign="top"></td></tr>
641	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> validator. In simple terms, a cache entry is considered to be valid</span></td><td class="lineno" valign="top"></td></tr>
642	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> if the entity has not been modified since the Last-Modified value.</span></td><td class="lineno" valign="top"></td></tr>
643	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
644	<tr><td><a name="diff0037" /></td></tr>
645	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> TBD.</span></td><td> </td><td class="rblock"><span class="insert">8. IANA Considerations</span></td><td class="lineno" valign="top"></td></tr>
646	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
647	<tr><td><a name="diff0038" /></td></tr>
648	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">8.</span> Security Considerations</td><td> </td><td class="rblock"> <span class="insert">[[anchor2: TBD.]]</span></td><td class="lineno" valign="top"></td></tr>
649	<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>
650	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">9.</span> Security Considerations</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"> No additional security considerations have been identified beyond</td><td> </td><td class="right"> No additional security considerations have been identified beyond</td><td class="lineno" valign="top"></td></tr>
653	<tr><td class="lineno" valign="top"></td><td class="left"> those applicable to HTTP in general [Part1].</td><td> </td><td class="right"> those applicable to HTTP in general [Part1].</td><td class="lineno" valign="top"></td></tr>
654	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
655	<tr><td><a name="diff0039" /></td></tr>
656	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">9</span>. Acknowledgments</td><td> </td><td class="rblock"><span class="insert">10</span>. Acknowledgments</td><td class="lineno" valign="top"></td></tr>
657	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
658	<tr><td><a name="diff0040" /></td></tr>
659	<tr><td class="lineno" valign="top"></td><td class="lblock">1<span class="delete">0</span>. References</td><td> </td><td class="rblock">1<span class="insert">1</span>. References</td><td class="lineno" valign="top"></td></tr>
660	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
661	<tr><td><a name="diff0041" /></td></tr>
662	<tr><td class="lineno" valign="top"></td><td class="lblock">1<span class="delete">0</span>.1. Normative References</td><td> </td><td class="rblock">1<span class="insert">1</span>.1. Normative References</td><td class="lineno" valign="top"></td></tr>
663	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
664	<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>
665	<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>
666	<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>
667	<tr><td><a name="diff0042" /></td></tr>
668	<tr><td class="lineno" valign="top"></td><td class="lblock"> and Message Parsing", <span class="delete">draft-ietf-httpbis-p1-messaging-01</span></td><td> </td><td class="rblock"> and Message Parsing", <span class="insert">draft-ietf-httpbis-p1-messaging-02</span></td><td class="lineno" valign="top"></td></tr>
669	<tr><td class="lineno" valign="top"></td><td class="lblock"> (work in progress), <span class="delete">January</span> 2008.</td><td> </td><td class="rblock"> (work in progress), <span class="insert">February</span> 2008.</td><td class="lineno" valign="top"></td></tr>
670	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
671	<tr><td class="lineno" valign="top"></td><td class="left"> [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>
672	<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>
673	<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>
674	<tr><td><a name="diff0043" /></td></tr>
675	<tr><td class="lineno" valign="top"></td><td class="lblock"> Partial Responses", <span class="delete">draft-ietf-httpbis-p5-range-01</span> (work</td><td> </td><td class="rblock"> Partial Responses", <span class="insert">draft-ietf-httpbis-p5-range-02</span> (work</td><td class="lineno" valign="top"></td></tr>
676	<tr><td class="lineno" valign="top"></td><td class="lblock"> in progress), <span class="delete">January</span> 2008.</td><td> </td><td class="rblock"> in progress), <span class="insert">February</span> 2008.</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"> [Part6] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right"> [Part6] Fielding, R., Ed., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
679	<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>
680	<tr><td class="lineno" valign="top"></td><td class="left"> and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",</td><td> </td><td class="right"> and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",</td><td class="lineno" valign="top"></td></tr>
681	<tr><td><a name="diff0044" /></td></tr>
682	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">draft-ietf-httpbis-p6-cache-01</span> (work in progress),</td><td> </td><td class="rblock"> <span class="insert">draft-ietf-httpbis-p6-cache-02</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
683	<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">January</span> 2008.</td><td> </td><td class="rblock"> <span class="insert">February</span> 2008.</td><td class="lineno" valign="top"></td></tr>
684	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
685	<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>
686	<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>
687	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
688	<tr><td><a name="diff0045" /></td></tr>
689	<tr><td class="lineno" valign="top"></td><td class="lblock">1<span class="delete">0</span>.2. Informative References</td><td> </td><td class="rblock">1<span class="insert">1</span>.2. Informative References</td><td class="lineno" valign="top"></td></tr>
690	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
691	<tr><td class="lineno" valign="top"></td><td class="left"> [RFC2068] Fielding, R., Gettys, J., Mogul, J., Nielsen, H., and T.</td><td> </td><td class="right"> [RFC2068] Fielding, R., Gettys, J., Mogul, J., Nielsen, H., and T.</td><td class="lineno" valign="top"></td></tr>
692	<tr><td class="lineno" valign="top"></td><td class="left"> Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1",</td><td> </td><td class="right"> Berners-Lee, "Hypertext Transfer Protocol -- HTTP/1.1",</td><td class="lineno" valign="top"></td></tr>
693	<tr><td class="lineno" valign="top"></td><td class="left"> RFC 2068, January 1997.</td><td> </td><td class="right"> RFC 2068, January 1997.</td><td class="lineno" valign="top"></td></tr>
694	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
695	<tr><td class="lineno" valign="top"></td><td class="left"> [RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,</td><td> </td><td class="right"> [RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,</td><td class="lineno" valign="top"></td></tr>
696	<tr><td class="lineno" valign="top"></td><td class="left"> Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext</td><td> </td><td class="right"> Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext</td><td class="lineno" valign="top"></td></tr>
697	<tr><td class="lineno" valign="top"></td><td class="left"> Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.</td><td> </td><td class="right"> Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.</td><td class="lineno" valign="top"></td></tr>
698	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
699	<tr><td class="lineno" valign="top"></td><td class="left">Appendix A. Compatibility with Previous Versions</td><td> </td><td class="right">Appendix A. Compatibility with Previous Versions</td><td class="lineno" valign="top"></td></tr>
700	<tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
701	<tr bgcolor="gray" ><td></td><th><a name="part-l16" /><small>skipping to change at</small><em> page 18, line 16</em></th><th> </th><th><a name="part-r16" /><small>skipping to change at</small><em> page 18, line 45</em></th><td></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"> Closed issues:</td><td> </td><td class="right"> Closed issues:</td><td class="lineno" valign="top"></td></tr>
704	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
705	<tr><td class="lineno" valign="top"></td><td class="left"> o <http://www3.tools.ietf.org/wg/httpbis/trac/ticket/35>: "Normative</td><td> </td><td class="right"> o <http://www3.tools.ietf.org/wg/httpbis/trac/ticket/35>: "Normative</td><td class="lineno" valign="top"></td></tr>
706	<tr><td class="lineno" valign="top"></td><td class="left"> and Informative references"</td><td> </td><td class="right"> and Informative references"</td><td class="lineno" valign="top"></td></tr>
707	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
708	<tr><td class="lineno" valign="top"></td><td class="left"> Other changes:</td><td> </td><td class="right"> Other changes:</td><td class="lineno" valign="top"></td></tr>
709	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
710	<tr><td class="lineno" valign="top"></td><td class="left"> o Move definitions of 304 and 412 condition codes from Part2.</td><td> </td><td class="right"> o Move definitions of 304 and 412 condition codes from Part2.</td><td class="lineno" valign="top"></td></tr>
711	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
712	<tr><td><a name="diff0046" /></td></tr>
713	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">B.3. Since draft-ietf-httpbis-p4-conditional-01</span></td><td class="lineno" valign="top"></td></tr>
714	<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>
715	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Ongoing work on ABNF conversion</span></td><td class="lineno" valign="top"></td></tr>
716	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> (<http://www3.tools.ietf.org/wg/httpbis/trac/ticket/36>):</span></td><td class="lineno" valign="top"></td></tr>
717	<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>
718	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o Add explicit references to BNF syntax and rules imported from</span></td><td class="lineno" valign="top"></td></tr>
719	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> other parts of the specification.</span></td><td class="lineno" valign="top"></td></tr>
720	<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"> </td><td class="lineno" valign="top"></td></tr>
721	<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>
722	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
723	<tr><td class="lineno" valign="top"></td><td class="left"> 3</td><td> </td><td class="right"> 3</td><td class="lineno" valign="top"></td></tr>
724	<tr><td class="lineno" valign="top"></td><td class="left"> 304 Not Modified (status code) 5</td><td> </td><td class="right"> 304 Not Modified (status code) 5</td><td class="lineno" valign="top"></td></tr>
725	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
726	<tr><td class="lineno" valign="top"></td><td class="left"> 4</td><td> </td><td class="right"> 4</td><td class="lineno" valign="top"></td></tr>
727	<tr><td class="lineno" valign="top"></td><td class="left"> 412 Precondition Failed (status code) 6</td><td> </td><td class="right"> 412 Precondition Failed (status code) 6</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"> E</td><td> </td><td class="right"> E</td><td class="lineno" valign="top"></td></tr>
730	<tr><td class="lineno" valign="top"></td><td class="left"> ETag header 11</td><td> </td><td class="right"> ETag header 11</td><td class="lineno" valign="top"></td></tr>
731	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
732	<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>
733	<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>
734	<tr><td class="lineno" valign="top"></td><td class="left"> entity-tag 5</td><td> </td><td class="right"> entity-tag 5</td><td class="lineno" valign="top"></td></tr>
735	<tr><td class="lineno" valign="top"></td><td class="left"> ETag 11</td><td> </td><td class="right"> ETag 11</td><td class="lineno" valign="top"></td></tr>
736	<tr><td><a name="diff0047" /></td></tr>
737	<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Match <span class="delete">11</span></td><td> </td><td class="rblock"> If-Match 12</td><td class="lineno" valign="top"></td></tr>
738	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> If-Modified-Since</span> 12</td><td> </td><td class="rblock"> <span class="insert">If-Modified-Since 13</span></td><td class="lineno" valign="top"></td></tr>
739	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match 14</td><td> </td><td class="right"> If-None-Match 14</td><td class="lineno" valign="top"></td></tr>
740	<tr><td><a name="diff0048" /></td></tr>
741	<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Unmodified-Since 1<span class="delete">5</span></td><td> </td><td class="rblock"> If-Unmodified-Since 1<span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
742	<tr><td class="lineno" valign="top"></td><td class="left"> Last-Modified 16</td><td> </td><td class="right"> Last-Modified 16</td><td class="lineno" valign="top"></td></tr>
743	<tr><td class="lineno" valign="top"></td><td class="left"> opaque-tag 5</td><td> </td><td class="right"> opaque-tag 5</td><td class="lineno" valign="top"></td></tr>
744	<tr><td class="lineno" valign="top"></td><td class="left"> weak 5</td><td> </td><td class="right"> weak 5</td><td class="lineno" valign="top"></td></tr>
745	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
746	<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>
747	<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>
748	<tr><td class="lineno" valign="top"></td><td class="left"> ETag 11</td><td> </td><td class="right"> ETag 11</td><td class="lineno" valign="top"></td></tr>
749	<tr><td><a name="diff0049" /></td></tr>
750	<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Match <span class="delete">11</span></td><td> </td><td class="rblock"> If-Match 12</td><td class="lineno" valign="top"></td></tr>
751	<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> If-Modified-Since</span> 12</td><td> </td><td class="rblock"> <span class="insert">If-Modified-Since 13</span></td><td class="lineno" valign="top"></td></tr>
752	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match 14</td><td> </td><td class="right"> If-None-Match 14</td><td class="lineno" valign="top"></td></tr>
753	<tr><td><a name="diff0050" /></td></tr>
754	<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Unmodified-Since 1<span class="delete">5</span></td><td> </td><td class="rblock"> If-Unmodified-Since 1<span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
755	<tr><td class="lineno" valign="top"></td><td class="left"> Last-Modified 16</td><td> </td><td class="right"> Last-Modified 16</td><td class="lineno" valign="top"></td></tr>
756	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
757	<tr><td class="lineno" valign="top"></td><td class="left"> I</td><td> </td><td class="right"> I</td><td class="lineno" valign="top"></td></tr>
758	<tr><td><a name="diff0051" /></td></tr>
759	<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Match header <span class="delete">11</span></td><td> </td><td class="rblock"> If-Match header <span class="insert">12</span></td><td class="lineno" valign="top"></td></tr>
760	<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Modified-Since header <span class="delete">12</span></td><td> </td><td class="rblock"> If-Modified-Since header <span class="insert">13</span></td><td class="lineno" valign="top"></td></tr>
761	<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match header 14</td><td> </td><td class="right"> If-None-Match header 14</td><td class="lineno" valign="top"></td></tr>
762	<tr><td><a name="diff0052" /></td></tr>
763	<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Unmodified-Since header 1<span class="delete">5</span></td><td> </td><td class="rblock"> If-Unmodified-Since header 1<span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
764	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
765	<tr><td class="lineno" valign="top"></td><td class="left"> L</td><td> </td><td class="right"> L</td><td class="lineno" valign="top"></td></tr>
766	<tr><td class="lineno" valign="top"></td><td class="left"> Last-Modified header 16</td><td> </td><td class="right"> Last-Modified header 16</td><td class="lineno" valign="top"></td></tr>
767	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
768	<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>
769	<tr><td class="lineno" valign="top"></td><td class="left"> Status Codes</td><td> </td><td class="right"> Status Codes</td><td class="lineno" valign="top"></td></tr>
770	<tr><td class="lineno" valign="top"></td><td class="left"> 304 Not Modified 5</td><td> </td><td class="right"> 304 Not Modified 5</td><td class="lineno" valign="top"></td></tr>
771	<tr><td class="lineno" valign="top"></td><td class="left"> 412 Precondition Failed 6</td><td> </td><td class="right"> 412 Precondition Failed 6</td><td class="lineno" valign="top"></td></tr>
772	<tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
773	<tr><td class="lineno" valign="top"></td><td class="left">Authors' Addresses</td><td> </td><td class="right">Authors' Addresses</td><td class="lineno" valign="top"></td></tr>
774
775	<tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
776	<tr bgcolor="gray"><th colspan="5" align="center"><a name="end"> End of changes. 52 change blocks. </a></th></tr>
777	<tr class="stats"><td></td><th><i>84 lines changed or deleted</i></th><th><i> </i></th><th><i>126 lines changed or added</i></th><td></td></tr>
778	<tr><td colspan="5" align="center" class="small"><br/>This html diff was produced by rfcdiff 1.34. The latest version is available from <a href="http://www.tools.ietf.org/tools/rfcdiff/" >http://tools.ietf.org/tools/rfcdiff/</a> </td></tr>
779	</table>
780	</body>
781	</html>

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