source: draft-ietf-httpbis/diffs/draft-ietf-httpbis-p4-conditional-06-from-5.diff.html @ 823

Last change on this file since 823 was 547, checked in by julian.reschke@…, 11 years ago

Prepare submission of draft -06 on Monday, March 09.

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35</head> 
36<body > 
37  <table border="0" cellpadding="0" cellspacing="0"> 
38  <tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p4-conditional-05.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p4-conditional-06.txt&nbsp;</th><th></th></tr> 
39      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
40      <tr><td><a name="diff0001" /></td></tr>
41      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">Network</span> Working Group                                   R. Fielding, Ed.</td><td> </td><td class="rblock"><span class="insert">HTTPbis</span> Working Group                                   R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
42      <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>
43      <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>
44      <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>
45      <tr><td><a name="diff0002" /></td></tr>
46      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">May 20, 2009      </span>                                     J. Mogul</td><td> </td><td class="rblock">Expires: <span class="insert">September 10, 2009</span>                                     J. Mogul</td><td class="lineno" valign="top"></td></tr>
47      <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>
48      <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>
49      <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>
50      <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>
51      <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>
52      <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>
53      <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>
54      <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>
55      <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>
56      <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>
57      <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>
58      <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>
59      <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>
60      <tr><td><a name="diff0003" /></td></tr>
61      <tr><td class="lineno" valign="top"></td><td class="lblock">                                                       <span class="delete">November 16, 2008</span></td><td> </td><td class="rblock">                                                       <span class="insert">    March 9, 2009</span></td><td class="lineno" valign="top"></td></tr>
62      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
63      <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>
64      <tr><td><a name="diff0004" /></td></tr>
65      <tr><td class="lineno" valign="top"></td><td class="lblock">                  draft-ietf-httpbis-p4-conditional-0<span class="delete">5</span></td><td> </td><td class="rblock">                  draft-ietf-httpbis-p4-conditional-0<span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
66      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
67      <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>
68      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
69      <tr><td><a name="diff0005" /></td></tr>
70      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">By submitting this Internet-Draft, each author represents that any</span></td><td> </td><td class="rblock">   <span class="insert">This Internet-Draft is submitted to IETF in full conformance with the</span></td><td class="lineno" valign="top"></td></tr>
71      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   applicable patent or other IPR claims</span> of <span class="delete">which he</span> or <span class="delete">she is aware</span></td><td> </td><td class="rblock"><span class="insert">   provisions</span> of <span class="insert">BCP 78 and BCP 79.  This document may contain material</span></td><td class="lineno" valign="top"></td></tr>
72      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   have been</span> or <span class="delete">will</span> be <span class="delete">disclosed,</span> and <span class="delete">any</span> of <span class="delete">which he or she becomes</span></td><td> </td><td class="rblock"><span class="insert">   from IETF Documents</span> or <span class="insert">IETF Contributions published</span> or <span class="insert">made publicly</span></td><td class="lineno" valign="top"></td></tr>
73      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   aware will</span> be <span class="delete">disclosed, in accordance with Section 6 of BCP 79.</span></td><td> </td><td class="rblock"><span class="insert">   available before November 10, 2008.  The person(s) controlling the</span></td><td class="lineno" valign="top"></td></tr>
74      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   copyright in some of this material may not have granted the IETF</span></td><td class="lineno" valign="top"></td></tr>
75      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Trust the right to allow modifications of such material outside the</span></td><td class="lineno" valign="top"></td></tr>
76      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   IETF Standards Process.  Without obtaining an adequate license from</span></td><td class="lineno" valign="top"></td></tr>
77      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   the person(s) controlling the copyright in such materials, this</span></td><td class="lineno" valign="top"></td></tr>
78      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   document may not</span> be <span class="insert">modified outside the IETF Standards Process,</span> and</td><td class="lineno" valign="top"></td></tr>
79      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">derivative works</span> of <span class="insert">it may not</span> be <span class="insert">created outside the IETF Standards</span></td><td class="lineno" valign="top"></td></tr>
80      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Process, except to format it for publication as an RFC or to</span></td><td class="lineno" valign="top"></td></tr>
81      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   translate it into languages other than English.</span></td><td class="lineno" valign="top"></td></tr>
82      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
83      <tr><td class="lineno" valign="top"></td><td class="left">   Internet-Drafts are working documents of the Internet Engineering</td><td> </td><td class="right">   Internet-Drafts are working documents of the Internet Engineering</td><td class="lineno" valign="top"></td></tr>
84      <tr><td class="lineno" valign="top"></td><td class="left">   Task Force (IETF), 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>
85      <tr><td class="lineno" valign="top"></td><td class="left">   other groups may also distribute working documents as Internet-</td><td> </td><td class="right">   other groups may also distribute working documents as Internet-</td><td class="lineno" valign="top"></td></tr>
86      <tr><td class="lineno" valign="top"></td><td class="left">   Drafts.</td><td> </td><td class="right">   Drafts.</td><td class="lineno" valign="top"></td></tr>
87      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
88      <tr><td class="lineno" valign="top"></td><td class="left">   Internet-Drafts are draft documents valid for a maximum of six months</td><td> </td><td class="right">   Internet-Drafts are draft documents valid for a maximum of six months</td><td class="lineno" valign="top"></td></tr>
89      <tr><td class="lineno" valign="top"></td><td class="left">   and may be updated, replaced, or obsoleted by other documents at any</td><td> </td><td class="right">   and may be updated, replaced, or obsoleted by other documents at any</td><td class="lineno" valign="top"></td></tr>
90      <tr><td class="lineno" valign="top"></td><td class="left">   time.  It is inappropriate to use Internet-Drafts as reference</td><td> </td><td class="right">   time.  It is inappropriate to use Internet-Drafts as reference</td><td class="lineno" valign="top"></td></tr>
91      <tr><td class="lineno" valign="top"></td><td class="left">   material or to cite them other than as "work in progress."</td><td> </td><td class="right">   material or to cite them other than as "work in progress."</td><td class="lineno" valign="top"></td></tr>
92      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
93      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 1, line 42</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 2, line 4</em></th><td></td></tr>
94      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
95      <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>
96      <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>
97      <tr><td class="lineno" valign="top"></td><td class="left">   other groups may also distribute working documents as Internet-</td><td> </td><td class="right">   other groups may also distribute working documents as Internet-</td><td class="lineno" valign="top"></td></tr>
98      <tr><td class="lineno" valign="top"></td><td class="left">   Drafts.</td><td> </td><td class="right">   Drafts.</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">   Internet-Drafts are draft documents valid for a maximum of six months</td><td> </td><td class="right">   Internet-Drafts are draft documents valid for a maximum of six months</td><td class="lineno" valign="top"></td></tr>
101      <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>
102      <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>
103      <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>
104      <tr><td><a name="diff0006" /></td></tr>
105      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                         </span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
106      <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>
107      <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>
108      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
109      <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>
110      <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>
111      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
112      <tr><td><a name="diff0007" /></td></tr>
113      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on <span class="delete">May 20,</span> 2009.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">September 10,</span> 2009.</td><td class="lineno" valign="top"></td></tr>
114      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
115      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">Copyright Notice</span></td><td class="lineno" valign="top"></td></tr>
116      <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>
117      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Copyright (c) 2009 IETF Trust and the persons identified as the</span></td><td class="lineno" valign="top"></td></tr>
118      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   document authors.  All rights reserved.</span></td><td class="lineno" valign="top"></td></tr>
119      <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>
120      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   This document is subject to BCP 78 and the IETF Trust's Legal</span></td><td class="lineno" valign="top"></td></tr>
121      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Provisions Relating to IETF Documents in effect on the date of</span></td><td class="lineno" valign="top"></td></tr>
122      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   publication of this document (http://trustee.ietf.org/license-info).</span></td><td class="lineno" valign="top"></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Please review these documents carefully, as they describe your rights</span></td><td class="lineno" valign="top"></td></tr>
124      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   and restrictions with respect to this document.</span></td><td class="lineno" valign="top"></td></tr>
125      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
126      <tr><td class="lineno" valign="top"></td><td class="left">Abstract</td><td> </td><td class="right">Abstract</td><td class="lineno" valign="top"></td></tr>
127      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
128      <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>
129      <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>
130      <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>
131      <tr><td class="lineno" valign="top"></td><td class="left">   information initiative since 1990.  This document is Part 4 of the</td><td> </td><td class="right">   information initiative since 1990.  This document is Part 4 of the</td><td class="lineno" valign="top"></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="left">   seven-part specification that defines the protocol referred to as</td><td> </td><td class="right">   seven-part specification that defines the protocol referred to as</td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="left">   "HTTP/1.1" and, taken together, obsoletes RFC 2616.  Part 4 defines</td><td> </td><td class="right">   "HTTP/1.1" and, taken together, obsoletes RFC 2616.  Part 4 defines</td><td class="lineno" valign="top"></td></tr>
134      <tr><td class="lineno" valign="top"></td><td class="left">   request header fields for indicating conditional requests and the</td><td> </td><td class="right">   request header fields for indicating conditional requests and the</td><td class="lineno" valign="top"></td></tr>
135      <tr><td class="lineno" valign="top"></td><td class="left">   rules for constructing responses to those requests.</td><td> </td><td class="right">   rules for constructing responses to those requests.</td><td class="lineno" valign="top"></td></tr>
136      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
137      <tr><td class="lineno" valign="top"></td><td class="left">Editorial Note (To be removed by RFC Editor)</td><td> </td><td class="right">Editorial Note (To be removed by RFC Editor)</td><td class="lineno" valign="top"></td></tr>
138      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
139      <tr><td class="lineno" valign="top"></td><td class="left">   Discussion of this draft should take place on the HTTPBIS working</td><td> </td><td class="right">   Discussion of this draft should take place on the HTTPBIS working</td><td class="lineno" valign="top"></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="left">   group mailing list (ietf-http-wg@w3.org).  The current issues list is</td><td> </td><td class="right">   group mailing list (ietf-http-wg@w3.org).  The current issues list is</td><td class="lineno" valign="top"></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="left">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td> </td><td class="right">   at &lt;http://tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td class="lineno" valign="top"></td></tr>
142      <tr><td class="lineno" valign="top"></td><td class="left">   documents (including fancy diffs) can be found at</td><td> </td><td class="right">   documents (including fancy diffs) can be found at</td><td class="lineno" valign="top"></td></tr>
143      <tr><td class="lineno" valign="top"></td><td class="left">   &lt;http://tools.ietf.org/wg/httpbis/&gt;.</td><td> </td><td class="right">   &lt;http://tools.ietf.org/wg/httpbis/&gt;.</td><td class="lineno" valign="top"></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
145      <tr><td><a name="diff0008" /></td></tr>
146      <tr><td class="lineno" valign="top"></td><td class="lblock">   The changes in this draft are summarized in Appendix <span class="delete">B.6</span>.</td><td> </td><td class="rblock">   The changes in this draft are summarized in Appendix <span class="insert">C.7</span>.</td><td class="lineno" valign="top"></td></tr>
147      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="left">Table of Contents</td><td> </td><td class="right">Table of Contents</td><td class="lineno" valign="top"></td></tr>
149      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
150      <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>
151      <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>
152      <tr><td><a name="diff0009" /></td></tr>
153      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">2.  Notational Conventions and Generic Grammar</span> . . . . . . . . . .  4</td><td> </td><td class="rblock">     <span class="insert">1.2.  Syntax Notation  . . . . . . . . . . .</span> . . . . . . . . . .  4</td><td class="lineno" valign="top"></td></tr>
154      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">3.</span>  Entity Tags  . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td> </td><td class="rblock">       <span class="insert">1.2.1.  Core Rules . . . . . . . . . . . . . . . . . . . . . .  5</span></td><td class="lineno" valign="top"></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">4.</span>  Status Code Definitions  . . . . . . . . . . . . . . . . . . .  <span class="delete">5</span></td><td> </td><td class="rblock"><span class="insert">       1.2.2.  ABNF Rules defined in other Parts of the</span></td><td class="lineno" valign="top"></td></tr>
156      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     4.1.</span>  304 Not Modified . . . . . . . . . . . . . . . . . . . . .  <span class="delete">5</span></td><td> </td><td class="rblock"><span class="insert">               Specification  . . . . . . . . . . . . . . . . . . . .  5</span></td><td class="lineno" valign="top"></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     4.2.</span>  412 Precondition Failed  . . . . . . . . . . . . . . . . .  6</td><td> </td><td class="rblock"><span class="insert">   2.</span>  Entity Tags  . . . . . . . . . . . . . . . . . . . . . . . . .  5</td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">5.</span>  Weak and Strong Validators . . . . . . . . . . . . . . . . . .  <span class="delete">6</span></td><td> </td><td class="rblock">   <span class="insert">3.</span>  Status Code Definitions  . . . . . . . . . . . . . . . . . . .  <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
159      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   6.</span>  Rules for When to Use Entity Tags and Last-Modified Dates  . .  9</td><td> </td><td class="rblock"><span class="insert">     3.1.</span>  304 Not Modified . . . . . . . . . . . . . . . . . . . . .  <span class="insert">6</span></td><td class="lineno" valign="top"></td></tr>
160      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">7.</span>  Header Field Definitions . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="rblock"><span class="insert">     3.2.</span>  412 Precondition Failed  . . . . . . . . . . . . . . . . .  6</td><td class="lineno" valign="top"></td></tr>
161      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">7.1.</span>  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="rblock">   <span class="insert">4.</span>  Weak and Strong Validators . . . . . . . . . . . . . . . . . .  <span class="insert">7</span></td><td class="lineno" valign="top"></td></tr>
162      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">7.2.</span>  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 12</td><td> </td><td class="rblock"><span class="insert">   5.</span>  Rules for When to Use Entity Tags and Last-Modified Dates  . .  9</td><td class="lineno" valign="top"></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">7.3.</span>  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . 13</td><td> </td><td class="rblock">   <span class="insert">6.</span>  Header Field Definitions . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
164      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">7.4.</span>  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">14</span></td><td> </td><td class="rblock">     <span class="insert">6.1.</span>  ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
165      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     7.5.</span>  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="rblock">     <span class="insert">6.2.</span>  If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 12</td><td class="lineno" valign="top"></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">7.6.</span>  Last-Modified  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">16</span></td><td> </td><td class="rblock">     <span class="insert">6.3.</span>  If-Modified-Since  . . . . . . . . . . . . . . . . . . . . 13</td><td class="lineno" valign="top"></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   8.</span>  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="rblock">     <span class="insert">6.4.</span>  If-None-Match  . . . . . . . . . . . . . . . . . . . . . . <span class="insert">15</span></td><td class="lineno" valign="top"></td></tr>
168      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">8.1.</span>  Message Header Registration  . . . . . . . . . . . . . . . 17</td><td> </td><td class="rblock"><span class="insert">     6.5.</span>  If-Unmodified-Since  . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">9.</span>  Security Considerations  . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="rblock">     <span class="insert">6.6.</span>  Last-Modified  . . . . . . . . . . . . . . . . . . . . . . <span class="insert">17</span></td><td class="lineno" valign="top"></td></tr>
170      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">10.</span> Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="rblock"><span class="insert">   7.</span>  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">11.</span> References . . . . . . . . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="rblock">     <span class="insert">7.1.</span>  Message Header Registration  . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">11.1.</span> Normative References . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="rblock">   <span class="insert">8.</span>  Security Considerations  . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
173      <tr><td class="lineno" valign="top"></td><td class="lblock">     <span class="delete">11.2.</span> Informative References . . . . . . . . . . . . . . . . . . <span class="delete">18</span></td><td> </td><td class="rblock">   <span class="insert">9.</span>  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
174      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix A.  Compatibility with Previous Versions  . . . . . . . . <span class="delete">18</span></td><td> </td><td class="rblock">   <span class="insert">10.</span> References . . . . . . . . . . . . . . . . . . . . . . . . . . 18</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">10.1.</span> Normative References . . . . . . . . . . . . . . . . . . . 18</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">10.2.</span> Informative References . . . . . . . . . . . . . . . . . . <span class="insert">19</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">   Appendix A.  Compatibility with Previous Versions  . . . . . . . . <span class="insert">19</span></td><td class="lineno" valign="top"></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="left">     A.1.  Changes from RFC 2616  . . . . . . . . . . . . . . . . . . 19</td><td> </td><td class="right">     A.1.  Changes from RFC 2616  . . . . . . . . . . . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
179      <tr><td><a name="diff0010" /></td></tr>
180      <tr><td class="lineno" valign="top"></td><td class="lblock">   Appendix B.  Change Log (to be removed by RFC Editor before</td><td> </td><td class="rblock">   Appendix B.  <span class="insert">Collected ABNF  . . . . . . . . . . . . . . . . . . . 20</span></td><td class="lineno" valign="top"></td></tr>
181      <tr><td class="lineno" valign="top"></td><td class="lblock">                publication)  . . . . . . . . . . . . . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock"><span class="insert">   Appendix C.</span>  Change Log (to be removed by RFC Editor before</td><td class="lineno" valign="top"></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     B.1.</span>  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock">                publication)  . . . . . . . . . . . . . . . . . . . . <span class="insert">20</span></td><td class="lineno" valign="top"></td></tr>
183      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     B.2.</span>  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock"><span class="insert">     C.1.</span>  Since RFC2616  . . . . . . . . . . . . . . . . . . . . . . <span class="insert">21</span></td><td class="lineno" valign="top"></td></tr>
184      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     B.3.</span>  Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock"><span class="insert">     C.2.</span>  Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . <span class="insert">21</span></td><td class="lineno" valign="top"></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     B.4.</span>  Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock"><span class="insert">     C.3.</span>  Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . <span class="insert">21</span></td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     B.5.</span>  Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock"><span class="insert">     C.4.</span>  Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . <span class="insert">21</span></td><td class="lineno" valign="top"></td></tr>
187      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">     B.6.</span>  Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock"><span class="insert">     C.5.</span>  Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . <span class="insert">21</span></td><td class="lineno" valign="top"></td></tr>
188      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Index  .</span> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">20</span></td><td> </td><td class="rblock"><span class="insert">     C.6.</span>  Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
189      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Authors' Addresses .</span> . . . . . . . . . . . . . . . . . . . . . . . <span class="delete">21</span></td><td> </td><td class="rblock"><span class="insert">     C.7.  Since draft-ietf-httpbis-p4-conditional-05</span> . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
190      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   Intellectual Property and Copyright Statements</span> . . . . . . . . . . <span class="delete">24</span></td><td> </td><td class="rblock"><span class="insert">   Index</span>  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">22</span></td><td class="lineno" valign="top"></td></tr>
191      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Authors' Addresses</span> . . . . . . . . . . . . . . . . . . . . . . . . <span class="insert">23</span></td><td class="lineno" valign="top"></td></tr>
192      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
193      <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>
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">   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>
196      <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>
197      <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>
198      <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>
199      <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>
200      <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>
201      <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>
202      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
203      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 4, line 43</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 4, line 43</em></th><td></td></tr>
204      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
205      <tr><td class="lineno" valign="top"></td><td class="left">   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>
206      <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>
207      <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>
208      <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>
209      <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>
210      <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>
211      <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>
212      <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>
213      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
214      <tr><td><a name="diff0011" /></td></tr>
215      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">2.  Notational Conventions and Generic Grammar</span></td><td> </td><td class="rblock"><span class="insert">1.2.  Syntax Notation</span></td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
217      <tr><td><a name="diff0012" /></td></tr>
218      <tr><td class="lineno" valign="top"></td><td class="lblock">   This specification uses the ABNF syntax defined in Section <span class="delete">2.1</span> of</td><td> </td><td class="rblock">   This specification uses the ABNF syntax defined in Section <span class="insert">1.2</span> of</td><td class="lineno" valign="top"></td></tr>
219      <tr><td class="lineno" valign="top"></td><td class="lblock">   [Part1] <span class="delete">and</span> the <span class="delete">core rules</span> defined in <span class="delete">Section 2.2 of [Part1]:</span></td><td> </td><td class="rblock">   [Part1] <span class="insert">(which extends</span> the <span class="insert">syntax</span> defined in <span class="insert">[RFC5234] with a list</span></td><td class="lineno" valign="top"></td></tr>
220      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   rule).  Appendix B shows the collected ABNF, with the list rule</span></td><td class="lineno" valign="top"></td></tr>
221      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   expanded.</span></td><td class="lineno" valign="top"></td></tr>
222      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
223      <tr><td><a name="diff0013" /></td></tr>
224      <tr><td class="lineno" valign="top"></td><td class="lblock">     quoted-string = &lt;quoted-string, defined in [Part1], Section <span class="delete">2.2&gt;</span></td><td> </td><td class="rblock">   <span class="insert">The following core rules are included by reference, as defined in</span></td><td class="lineno" valign="top"></td></tr>
225      <tr><td class="lineno" valign="top"></td><td class="lblock">     OWS           = &lt;OWS, defined in [Part1], Section <span class="delete">2.2&gt;</span></td><td> </td><td class="rblock"><span class="insert">   [RFC5234], Appendix B.1: ALPHA (letters), CR (carriage return), CRLF</span></td><td class="lineno" valign="top"></td></tr>
226      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   (CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote),</span></td><td class="lineno" valign="top"></td></tr>
227      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit</span></td><td class="lineno" valign="top"></td></tr>
228      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   sequence of data), SP (space), VCHAR (any visible USASCII character),</span></td><td class="lineno" valign="top"></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   and WSP (whitespace).</span></td><td class="lineno" valign="top"></td></tr>
230      <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>
231      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">1.2.1.  Core Rules</span></td><td class="lineno" valign="top"></td></tr>
232      <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>
233      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   The core rules below are defined in Section 1.2.2 of [Part1]:</span></td><td class="lineno" valign="top"></td></tr>
234      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
235      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">     quoted-string = &lt;quoted-string, defined in [Part1], Section <span class="insert">1.2.2&gt;</span></td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">     OWS           = &lt;OWS, defined in [Part1], Section <span class="insert">1.2.2&gt;</span></td><td class="lineno" valign="top"></td></tr>
237      <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>
238      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">1.2.2.  ABNF Rules defined in other Parts of the Specification</span></td><td class="lineno" valign="top"></td></tr>
239      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
240      <tr><td class="lineno" valign="top"></td><td class="left">   The ABNF rules below are defined in other parts:</td><td> </td><td class="right">   The ABNF rules below are defined in other parts:</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="diff0014" /></td></tr>
243      <tr><td class="lineno" valign="top"></td><td class="lblock">     HTTP-date     = &lt;HTTP-date, defined in [Part1], Section 3.<span class="delete">3</span>.1&gt;</td><td> </td><td class="rblock">     HTTP-date     = &lt;HTTP-date, defined in [Part1], Section 3.<span class="insert">2</span>.1&gt;</td><td class="lineno" valign="top"></td></tr>
244      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
245      <tr><td><a name="diff0015" /></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">3</span>.  Entity Tags</td><td> </td><td class="rblock"><span class="insert">2</span>.  Entity Tags</td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
248      <tr><td class="lineno" valign="top"></td><td class="left">   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>
249      <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>
250      <tr><td><a name="diff0016" /></td></tr>
251      <tr><td class="lineno" valign="top"></td><td class="lblock">   (Section <span class="delete">7.1),</span> If-Match (Section <span class="delete">7.2),</span> If-None-Match (Section <span class="delete">7.4),</span></td><td> </td><td class="rblock">   (Section <span class="insert">6.1),</span> If-Match (Section <span class="insert">6.2),</span> If-None-Match (Section <span class="insert">6.4),</span></td><td class="lineno" valign="top"></td></tr>
252      <tr><td class="lineno" valign="top"></td><td class="lblock">   and If-Range (Section <span class="delete">6.3</span> of [Part5]) header fields.  The definition</td><td> </td><td class="rblock">   and If-Range (Section <span class="insert">5.3</span> of [Part5]) header fields.  The definition</td><td class="lineno" valign="top"></td></tr>
253      <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>
254      <tr><td><a name="diff0017" /></td></tr>
255      <tr><td class="lineno" valign="top"></td><td class="lblock">   Section <span class="delete">5</span>.  An entity tag consists of an opaque quoted string,</td><td> </td><td class="rblock">   Section <span class="insert">4</span>.  An entity tag consists of an opaque quoted string,</td><td class="lineno" valign="top"></td></tr>
256      <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>
257      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
258      <tr><td class="lineno" valign="top"></td><td class="left">     entity-tag = [ weak ] opaque-tag</td><td> </td><td class="right">     entity-tag = [ weak ] opaque-tag</td><td class="lineno" valign="top"></td></tr>
259      <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>
260      <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>
261      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
262      <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>
263      <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>
264      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
265      <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>
266      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
267      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 5, line 36</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 6, line 5</em></th><td></td></tr>
268      <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>
269      <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>
270      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
271      <tr><td class="lineno" valign="top"></td><td class="left">   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>
272      <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>
273      <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>
274      <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>
275      <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>
276      <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>
277      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
278      <tr><td><a name="diff0018" /></td></tr>
279      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">4</span>.  Status Code Definitions</td><td> </td><td class="rblock"><span class="insert">3</span>.  Status Code Definitions</td><td class="lineno" valign="top"></td></tr>
280      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
281      <tr><td><a name="diff0019" /></td></tr>
282      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">4</span>.1.  304 Not Modified</td><td> </td><td class="rblock"><span class="insert">3</span>.1.  304 Not Modified</td><td class="lineno" valign="top"></td></tr>
283      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
284      <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>
285      <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>
286      <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>
287      <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>
288      <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>
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 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>
291      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
292      <tr><td class="lineno" valign="top"></td><td class="left">   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>
293      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
294      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 6, line 15</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 6, line 31</em></th><td></td></tr>
295      <tr><td class="lineno" valign="top"></td><td class="left">      (as already specified by Section 8.3 of [Part1], caches will</td><td> </td><td class="right">      (as already specified by Section 8.3 of [Part1], caches will</td><td class="lineno" valign="top"></td></tr>
296      <tr><td class="lineno" valign="top"></td><td class="left">      operate correctly.</td><td> </td><td class="right">      operate correctly.</td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
298      <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>
299      <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>
300      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
301      <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>
302      <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>
303      <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>
304      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
305      <tr><td><a name="diff0020" /></td></tr>
306      <tr><td class="lineno" valign="top"></td><td class="lblock">   If the conditional GET used a strong cache validator (see Section <span class="delete">5</span>),</td><td> </td><td class="rblock">   If the conditional GET used a strong cache validator (see Section <span class="insert">4</span>),</td><td class="lineno" valign="top"></td></tr>
307      <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>
308      <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>
309      <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>
310      <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>
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">   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>
313      <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>
314      <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>
315      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
316      <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>
317      <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>
318      <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>
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><a name="diff0021" /></td></tr>
321      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">4</span>.2.  412 Precondition Failed</td><td> </td><td class="rblock"><span class="insert">3</span>.2.  412 Precondition Failed</td><td class="lineno" valign="top"></td></tr>
322      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
323      <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>
324      <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>
325      <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>
326      <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>
327      <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>
328      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
329      <tr><td><a name="diff0022" /></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">5</span>.  Weak and Strong Validators</td><td> </td><td class="rblock"><span class="insert">4</span>.  Weak and Strong Validators</td><td class="lineno" valign="top"></td></tr>
331      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
332      <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>
333      <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>
334      <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>
335      <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>
336      <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>
337      <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>
338      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
339      <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>
340      <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>
341      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
342      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 8, line 15</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 8, line 29</em></th><td></td></tr>
343      <tr><td class="lineno" valign="top"></td><td class="left">   +--------+--------+-------------------+-----------------+</td><td> </td><td class="right">   +--------+--------+-------------------+-----------------+</td><td class="lineno" valign="top"></td></tr>
344      <tr><td class="lineno" valign="top"></td><td class="left">   | ETag 1 | ETag 2 | Strong Comparison | Weak Comparison |</td><td> </td><td class="right">   | ETag 1 | ETag 2 | Strong Comparison | Weak Comparison |</td><td class="lineno" valign="top"></td></tr>
345      <tr><td class="lineno" valign="top"></td><td class="left">   +--------+--------+-------------------+-----------------+</td><td> </td><td class="right">   +--------+--------+-------------------+-----------------+</td><td class="lineno" valign="top"></td></tr>
346      <tr><td class="lineno" valign="top"></td><td class="left">   | W/"1"  | W/"1"  | no match          | match           |</td><td> </td><td class="right">   | W/"1"  | W/"1"  | no match          | match           |</td><td class="lineno" valign="top"></td></tr>
347      <tr><td class="lineno" valign="top"></td><td class="left">   | W/"1"  | W/"2"  | no match          | no match        |</td><td> </td><td class="right">   | W/"1"  | W/"2"  | no match          | no match        |</td><td class="lineno" valign="top"></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="left">   | W/"1"  | "1"    | no match          | match           |</td><td> </td><td class="right">   | W/"1"  | "1"    | no match          | match           |</td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left">   | "1"    | "1"    | match             | match           |</td><td> </td><td class="right">   | "1"    | "1"    | match             | match           |</td><td class="lineno" valign="top"></td></tr>
350      <tr><td class="lineno" valign="top"></td><td class="left">   +--------+--------+-------------------+-----------------+</td><td> </td><td class="right">   +--------+--------+-------------------+-----------------+</td><td class="lineno" valign="top"></td></tr>
351      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
352      <tr><td class="lineno" valign="top"></td><td class="left">   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>
353      <tr><td><a name="diff0023" /></td></tr>
354      <tr><td class="lineno" valign="top"></td><td class="lblock">   Section <span class="delete">3</span> gives the syntax for entity tags.</td><td> </td><td class="rblock">   Section <span class="insert">2</span> gives the syntax for entity tags.</td><td class="lineno" valign="top"></td></tr>
355      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
356      <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>
357      <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>
358      <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>
359      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
360      <tr><td 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>
361      <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>
362      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
363      <tr><td 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>
364      <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>
365      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
366      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 9, line 25</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 9, line 39</em></th><td></td></tr>
367      <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>
368      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
369      <tr><td class="lineno" valign="top"></td><td class="left">   A cache or origin server receiving a conditional range request</td><td> </td><td class="right">   A cache or origin server receiving a conditional range request</td><td class="lineno" valign="top"></td></tr>
370      <tr><td class="lineno" valign="top"></td><td class="left">   ([Part5]) MUST use the strong comparison function to evaluate the</td><td> </td><td class="right">   ([Part5]) MUST use the strong comparison function to evaluate the</td><td class="lineno" valign="top"></td></tr>
371      <tr><td class="lineno" valign="top"></td><td class="left">   condition.</td><td> </td><td class="right">   condition.</td><td class="lineno" valign="top"></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
373      <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>
374      <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>
375      <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>
376      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
377      <tr><td><a name="diff0024" /></td></tr>
378      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">6</span>.  Rules for When to Use Entity Tags and Last-Modified Dates</td><td> </td><td class="rblock"><span class="insert">5</span>.  Rules for When to Use Entity Tags and Last-Modified Dates</td><td class="lineno" valign="top"></td></tr>
379      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
380      <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>
381      <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>
382      <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>
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">   HTTP/1.1 origin servers:</td><td> </td><td class="right">   HTTP/1.1 origin servers:</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">   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>
387      <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>
388      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
389      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
390      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 11, line 16</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 11, line 28</em></th><td></td></tr>
391      <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>
392      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
393      <tr><td class="lineno" valign="top"></td><td class="left">      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>
394      <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>
395      <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>
396      <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>
397      <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>
398      <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>
399      <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>
400      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
401      <tr><td><a name="diff0025" /></td></tr>
402      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7</span>.  Header Field Definitions</td><td> </td><td class="rblock"><span class="insert">6</span>.  Header Field Definitions</td><td class="lineno" valign="top"></td></tr>
403      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
404      <tr><td class="lineno" valign="top"></td><td class="left">   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>
405      <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>
406      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
407      <tr><td class="lineno" valign="top"></td><td class="left">   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>
408      <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>
409      <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>
410      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
411      <tr><td><a name="diff0026" /></td></tr>
412      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7</span>.1.  ETag</td><td> </td><td class="rblock"><span class="insert">6</span>.1.  ETag</td><td class="lineno" valign="top"></td></tr>
413      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
414      <tr><td class="lineno" valign="top"></td><td class="left">   The response-header field "ETag" provides the current value of the</td><td> </td><td class="right">   The response-header field "ETag" provides the current value of the</td><td class="lineno" valign="top"></td></tr>
415      <tr><td><a name="diff0027" /></td></tr>
416      <tr><td class="lineno" valign="top"></td><td class="lblock">   entity tag (see Section <span class="delete">3)</span> for the requested variant.  The headers</td><td> </td><td class="rblock">   entity tag (see Section <span class="insert">2)</span> for the requested variant.  The headers</td><td class="lineno" valign="top"></td></tr>
417      <tr><td class="lineno" valign="top"></td><td class="lblock">   used with entity tags are described in Sections <span class="delete">7.2</span> and <span class="delete">7.4</span> of this</td><td> </td><td class="rblock">   used with entity tags are described in Sections <span class="insert">6.2</span> and <span class="insert">6.4</span> of this</td><td class="lineno" valign="top"></td></tr>
418      <tr><td class="lineno" valign="top"></td><td class="lblock">   document, and in Section <span class="delete">6.3</span> of [Part5].  The entity tag MAY be used</td><td> </td><td class="rblock">   document, and in Section <span class="insert">5.3</span> of [Part5].  The entity tag MAY be used</td><td class="lineno" valign="top"></td></tr>
419      <tr><td class="lineno" valign="top"></td><td class="left">   for comparison with other entities from the same resource (see</td><td> </td><td class="right">   for comparison with other entities from the same resource (see</td><td class="lineno" valign="top"></td></tr>
420      <tr><td><a name="diff0028" /></td></tr>
421      <tr><td class="lineno" valign="top"></td><td class="lblock">   Section <span class="delete">5</span>).</td><td> </td><td class="rblock">   Section <span class="insert">4</span>).</td><td class="lineno" valign="top"></td></tr>
422      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
423      <tr><td class="lineno" valign="top"></td><td class="left">     ETag   = "ETag" ":" OWS ETag-v</td><td> </td><td class="right">     ETag   = "ETag" ":" OWS ETag-v</td><td class="lineno" valign="top"></td></tr>
424      <tr><td class="lineno" valign="top"></td><td class="left">     ETag-v = entity-tag</td><td> </td><td class="right">     ETag-v = entity-tag</td><td class="lineno" valign="top"></td></tr>
425      <tr><td><a name="diff0029" /></td></tr>
426      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                         </span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
427      <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>
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 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>
430      <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>
431      <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>
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">   The ETag response-header field value, an entity tag, provides for an</td><td> </td><td class="right">   The ETag response-header field value, an entity tag, provides for an</td><td class="lineno" valign="top"></td></tr>
434      <tr><td class="lineno" valign="top"></td><td class="left">   "opaque" cache validator.  This might allow more reliable validation</td><td> </td><td class="right">   "opaque" cache validator.  This might allow more reliable validation</td><td class="lineno" valign="top"></td></tr>
435      <tr><td class="lineno" valign="top"></td><td class="left">   in situations where it is inconvenient to store modification dates,</td><td> </td><td class="right">   in situations where it is inconvenient to store modification dates,</td><td class="lineno" valign="top"></td></tr>
436      <tr><td class="lineno" valign="top"></td><td class="left">   where the one-second resolution of HTTP date values is not</td><td> </td><td class="right">   where the one-second resolution of HTTP date values is not</td><td class="lineno" valign="top"></td></tr>
437      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
438      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 12, line 10</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 12, line 25</em></th><td></td></tr>
439      <tr><td class="lineno" valign="top"></td><td class="left">   paradoxes that might arise from the use of modification dates.</td><td> </td><td class="right">   paradoxes that might arise from the use of modification dates.</td><td class="lineno" valign="top"></td></tr>
440      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
441      <tr><td class="lineno" valign="top"></td><td class="left">   The principle behind entity tags is that only the service author</td><td> </td><td class="right">   The principle behind entity tags is that only the service author</td><td class="lineno" valign="top"></td></tr>
442      <tr><td class="lineno" valign="top"></td><td class="left">   knows the semantics of a resource well enough to select an</td><td> </td><td class="right">   knows the semantics of a resource well enough to select an</td><td class="lineno" valign="top"></td></tr>
443      <tr><td class="lineno" valign="top"></td><td class="left">   appropriate cache validation mechanism, and the specification of any</td><td> </td><td class="right">   appropriate cache validation mechanism, and the specification of any</td><td class="lineno" valign="top"></td></tr>
444      <tr><td class="lineno" valign="top"></td><td class="left">   validator comparison function more complex than byte-equality would</td><td> </td><td class="right">   validator comparison function more complex than byte-equality would</td><td class="lineno" valign="top"></td></tr>
445      <tr><td class="lineno" valign="top"></td><td class="left">   open up a can of worms.  Thus, comparisons of any other headers</td><td> </td><td class="right">   open up a can of worms.  Thus, comparisons of any other headers</td><td class="lineno" valign="top"></td></tr>
446      <tr><td class="lineno" valign="top"></td><td class="left">   (except Last-Modified, for compatibility with HTTP/1.0) are never</td><td> </td><td class="right">   (except Last-Modified, for compatibility with HTTP/1.0) are never</td><td class="lineno" valign="top"></td></tr>
447      <tr><td class="lineno" valign="top"></td><td class="left">   used for purposes of validating a cache entry.</td><td> </td><td class="right">   used for purposes of validating a cache entry.</td><td class="lineno" valign="top"></td></tr>
448      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
449      <tr><td><a name="diff0030" /></td></tr>
450      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7</span>.2.  If-Match</td><td> </td><td class="rblock"><span class="insert">6</span>.2.  If-Match</td><td class="lineno" valign="top"></td></tr>
451      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
452      <tr><td class="lineno" valign="top"></td><td class="left">   The request-header field "If-Match" is used with a method to make it</td><td> </td><td class="right">   The request-header field "If-Match" is used with a method to make it</td><td class="lineno" valign="top"></td></tr>
453      <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>
454      <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>
455      <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>
456      <tr><td><a name="diff0031" /></td></tr>
457      <tr><td class="lineno" valign="top"></td><td class="lblock">   If-Match header field.  Entity tags are defined in Section <span class="delete">3</span>.  The</td><td> </td><td class="rblock">   If-Match header field.  Entity tags are defined in Section <span class="insert">2</span>.  The</td><td class="lineno" valign="top"></td></tr>
458      <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>
459      <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>
460      <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>
461      <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>
462      <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>
463      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
464      <tr><td class="lineno" valign="top"></td><td class="left">     If-Match   = "If-Match" ":" OWS If-Match-v</td><td> </td><td class="right">     If-Match   = "If-Match" ":" OWS If-Match-v</td><td class="lineno" valign="top"></td></tr>
465      <tr><td class="lineno" valign="top"></td><td class="left">     If-Match-v = "*" / 1#entity-tag</td><td> </td><td class="right">     If-Match-v = "*" / 1#entity-tag</td><td class="lineno" valign="top"></td></tr>
466      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
467      <tr><td class="lineno" valign="top"></td><td class="left">   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>
468      <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>
469      <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>
470      <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>
471      <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>
472      <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>
473      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
474      <tr><td><a name="diff0032" /></td></tr>
475      <tr><td class="lineno" valign="top"></td><td class="lblock">   A server MUST use the strong comparison function (see Section <span class="delete">5</span>) to</td><td> </td><td class="rblock">   A server MUST use the strong comparison function (see Section <span class="insert">4</span>) to</td><td class="lineno" valign="top"></td></tr>
476      <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>
477      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
478      <tr><td class="lineno" valign="top"></td><td class="left">   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>
479      <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>
480      <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>
481      <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>
482      <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>
483      <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>
484      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
485      <tr><td class="lineno" valign="top"></td><td class="left">   If 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>
486      <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>
487      <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>
488      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
489      <tr><td class="lineno" valign="top"></td><td class="left">   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>
490      <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>
491      <tr><td><a name="diff0033" /></td></tr>
492      <tr><td class="lineno" valign="top"></td><td class="lblock">   possibly using the Vary mechanism, see Section <span class="delete">16</span>.5 of [Part6])</td><td> </td><td class="rblock">   possibly using the Vary mechanism, see Section <span class="insert">3</span>.5 of [Part6])</td><td class="lineno" valign="top"></td></tr>
493      <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>
494      <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>
495      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
496      <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>
497      <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>
498      <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>
499      <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>
500      <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>
501      <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>
502      <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>
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">     If-Match: "xyzzy"</td><td> </td><td class="right">     If-Match: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
505      <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>
506      <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>
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">   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>
509      <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>
510      <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>
511      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
512      <tr><td><a name="diff0034" /></td></tr>
513      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7</span>.3.  If-Modified-Since</td><td> </td><td class="rblock"><span class="insert">6</span>.3.  If-Modified-Since</td><td class="lineno" valign="top"></td></tr>
514      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
515      <tr><td class="lineno" valign="top"></td><td class="left">   The request-header field "If-Modified-Since" is used with a method to</td><td> </td><td class="right">   The request-header field "If-Modified-Since" is used with a method to</td><td class="lineno" valign="top"></td></tr>
516      <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>
517      <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>
518      <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>
519      <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>
520      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
521      <tr><td class="lineno" valign="top"></td><td class="left">     If-Modified-Since   = "If-Modified-Since" ":" OWS</td><td> </td><td class="right">     If-Modified-Since   = "If-Modified-Since" ":" OWS</td><td class="lineno" valign="top"></td></tr>
522      <tr><td class="lineno" valign="top"></td><td class="left">                           If-Modified-Since-v</td><td> </td><td class="right">                           If-Modified-Since-v</td><td class="lineno" valign="top"></td></tr>
523      <tr><td class="lineno" valign="top"></td><td class="left">     If-Modified-Since-v = HTTP-date</td><td> </td><td class="right">     If-Modified-Since-v = HTTP-date</td><td class="lineno" valign="top"></td></tr>
524      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
525      <tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 14, line 9</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 14, line 25</em></th><td></td></tr>
526      <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>
527      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
528      <tr><td 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>
529      <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>
530      <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>
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 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>
533      <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>
534      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
535      <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>
536      <tr><td><a name="diff0035" /></td></tr>
537      <tr><td class="lineno" valign="top"></td><td class="lblock">      Modified-Since; see Section <span class="delete">6</span>.4 of [Part5] for full details.</td><td> </td><td class="rblock">      Modified-Since; see Section <span class="insert">5</span>.4 of [Part5] for full details.</td><td class="lineno" valign="top"></td></tr>
538      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
539      <tr><td class="lineno" valign="top"></td><td class="left">      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>
540      <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>
541      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
542      <tr><td class="lineno" valign="top"></td><td class="left">      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>
543      <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>
544      <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>
545      <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>
546      <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>
547      <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>
548      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
549      <tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 14, line 41</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 15, line 9</em></th><td></td></tr>
550      <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>
551      <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>
552      <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>
553      <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>
554      <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>
555      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
556      <tr><td class="lineno" valign="top"></td><td class="left">   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>
557      <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>
558      <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>
559      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
560      <tr><td><a name="diff0036" /></td></tr>
561      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7</span>.4.  If-None-Match</td><td> </td><td class="rblock"><span class="insert">6</span>.4.  If-None-Match</td><td class="lineno" valign="top"></td></tr>
562      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
563      <tr><td class="lineno" valign="top"></td><td class="left">   The request-header field "If-None-Match" is used with a method to</td><td> </td><td class="right">   The request-header field "If-None-Match" is used with a method to</td><td class="lineno" valign="top"></td></tr>
564      <tr><td class="lineno" valign="top"></td><td class="left">   make it conditional.  A client that has one or more entities</td><td> </td><td class="right">   make it conditional.  A client that has one or more entities</td><td class="lineno" valign="top"></td></tr>
565      <tr><td class="lineno" valign="top"></td><td class="left">   previously obtained from the resource can verify that none of those</td><td> </td><td class="right">   previously obtained from the resource can verify that none of those</td><td class="lineno" valign="top"></td></tr>
566      <tr><td class="lineno" valign="top"></td><td class="left">   entities is current by including a list of their associated entity</td><td> </td><td class="right">   entities is current by including a list of their associated entity</td><td class="lineno" valign="top"></td></tr>
567      <tr><td class="lineno" valign="top"></td><td class="left">   tags in the If-None-Match header field.  The purpose of this feature</td><td> </td><td class="right">   tags in the If-None-Match header field.  The purpose of this feature</td><td class="lineno" valign="top"></td></tr>
568      <tr><td class="lineno" valign="top"></td><td class="left">   is to allow efficient updates of cached information with a minimum</td><td> </td><td class="right">   is to allow efficient updates of cached information with a minimum</td><td class="lineno" valign="top"></td></tr>
569      <tr><td class="lineno" valign="top"></td><td class="left">   amount of transaction overhead.  It is also used to prevent a method</td><td> </td><td class="right">   amount of transaction overhead.  It is also used to prevent a method</td><td class="lineno" valign="top"></td></tr>
570      <tr><td class="lineno" valign="top"></td><td class="left">   (e.g.  PUT) from inadvertently modifying an existing resource when</td><td> </td><td class="right">   (e.g.  PUT) from inadvertently modifying an existing resource when</td><td class="lineno" valign="top"></td></tr>
571      <tr><td class="lineno" valign="top"></td><td class="left">   the client believes that the resource does not exist.</td><td> </td><td class="right">   the client believes that the resource does not exist.</td><td class="lineno" valign="top"></td></tr>
572      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
573      <tr bgcolor="gray" ><td></td><th><a name="part-l12" /><small>skipping to change at</small><em> page 15, line 24</em></th><th> </th><th><a name="part-r12" /><small>skipping to change at</small><em> page 15, line 40</em></th><td></td></tr>
574      <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>
575      <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>
576      <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>
577      <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>
578      <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>
579      <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>
580      <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>
581      <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>
582      <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>
583      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
584      <tr><td><a name="diff0037" /></td></tr>
585      <tr><td class="lineno" valign="top"></td><td class="lblock">   See Section <span class="delete">5</span> for rules on how to determine if two entity tags match.</td><td> </td><td class="rblock">   See Section <span class="insert">4</span> for rules on how to determine if two entity tags 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">   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>
588      <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>
589      <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>
590      <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>
591      <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>
592      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
593      <tr><td class="lineno" valign="top"></td><td class="left">   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>
594      <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>
595      <tr><td><a name="diff0038" /></td></tr>
596      <tr><td class="lineno" valign="top"></td><td class="lblock">   header MUST be ignored.  (See Section <span class="delete">6</span> for a discussion of server</td><td> </td><td class="rblock">   header MUST be ignored.  (See Section <span class="insert">5</span> for a discussion of server</td><td class="lineno" valign="top"></td></tr>
597      <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>
598      <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>
599      <tr><td><a name="diff0039" /></td></tr>
600      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">                                                                         </span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
601      <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>
602      <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>
603      <tr><td><a name="diff0040" /></td></tr>
604      <tr><td class="lineno" valign="top"></td><td class="lblock">   a cache, possibly using the Vary mechanism, see Section <span class="delete">16</span>.5 of</td><td> </td><td class="rblock">   a cache, possibly using the Vary mechanism, see Section <span class="insert">3</span>.5 of</td><td class="lineno" valign="top"></td></tr>
605      <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>
606      <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>
607      <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>
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">   Examples:</td><td> </td><td class="right">   Examples:</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">     If-None-Match: "xyzzy"</td><td> </td><td class="right">     If-None-Match: "xyzzy"</td><td class="lineno" valign="top"></td></tr>
612      <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>
613      <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>
614      <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>
615      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
616      <tr bgcolor="gray" ><td></td><th><a name="part-l13" /><small>skipping to change at</small><em> page 16, line 4</em></th><th> </th><th><a name="part-r13" /><small>skipping to change at</small><em> page 16, line 18</em></th><td></td></tr>
617      <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>
618      <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>
619      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
620      <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>
621      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
622      <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>
623      <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>
624      <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>
625      <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>
626      <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>
627      <tr><td><a name="diff0041" /></td></tr>
628      <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>
629      <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>
630      <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>
631      <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>
632      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
633      <tr><td><a name="diff0042" /></td></tr>
634      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7</span>.5.  If-Unmodified-Since</td><td> </td><td class="rblock"><span class="insert">6</span>.5.  If-Unmodified-Since</td><td class="lineno" valign="top"></td></tr>
635      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
636      <tr><td class="lineno" valign="top"></td><td class="left">   The request-header field "If-Unmodified-Since" is used with a method</td><td> </td><td class="right">   The request-header field "If-Unmodified-Since" is used with a method</td><td class="lineno" valign="top"></td></tr>
637      <tr><td class="lineno" valign="top"></td><td class="left">   to make it conditional.  If the requested resource has not been</td><td> </td><td class="right">   to make it conditional.  If the requested resource has not been</td><td class="lineno" valign="top"></td></tr>
638      <tr><td class="lineno" valign="top"></td><td class="left">   modified since the time specified in this field, the server SHOULD</td><td> </td><td class="right">   modified since the time specified in this field, the server SHOULD</td><td class="lineno" valign="top"></td></tr>
639      <tr><td class="lineno" valign="top"></td><td class="left">   perform the requested operation as if the If-Unmodified-Since header</td><td> </td><td class="right">   perform the requested operation as if the If-Unmodified-Since header</td><td class="lineno" valign="top"></td></tr>
640      <tr><td class="lineno" valign="top"></td><td class="left">   were not present.</td><td> </td><td class="right">   were not present.</td><td class="lineno" valign="top"></td></tr>
641      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
642      <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>
643      <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>
644      <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>
645      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
646      <tr bgcolor="gray" ><td></td><th><a name="part-l14" /><small>skipping to change at</small><em> page 16, line 38</em></th><th> </th><th><a name="part-r14" /><small>skipping to change at</small><em> page 17, line 5</em></th><td></td></tr>
647      <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>
648      <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>
649      <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>
650      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
651      <tr><td 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>
652      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
653      <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>
654      <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>
655      <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>
656      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
657      <tr><td><a name="diff0043" /></td></tr>
658      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">7</span>.6.  Last-Modified</td><td> </td><td class="rblock"><span class="insert">6</span>.6.  Last-Modified</td><td class="lineno" valign="top"></td></tr>
659      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
660      <tr><td class="lineno" valign="top"></td><td class="left">   The entity-header field "Last-Modified" indicates the date and time</td><td> </td><td class="right">   The entity-header field "Last-Modified" indicates the date and time</td><td class="lineno" valign="top"></td></tr>
661      <tr><td class="lineno" valign="top"></td><td class="left">   at which the origin server believes the variant was last modified.</td><td> </td><td class="right">   at which the origin server believes the variant was last modified.</td><td class="lineno" valign="top"></td></tr>
662      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
663      <tr><td class="lineno" valign="top"></td><td class="left">     Last-Modified   = "Last-Modified" ":" OWS Last-Modified-v</td><td> </td><td class="right">     Last-Modified   = "Last-Modified" ":" OWS Last-Modified-v</td><td class="lineno" valign="top"></td></tr>
664      <tr><td class="lineno" valign="top"></td><td class="left">     Last-Modified-v = HTTP-date</td><td> </td><td class="right">     Last-Modified-v = HTTP-date</td><td class="lineno" valign="top"></td></tr>
665      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
666      <tr><td 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>
667      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
668      <tr><td class="lineno" valign="top"></td><td class="left">     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>
669      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
670      <tr bgcolor="gray" ><td></td><th><a name="part-l15" /><small>skipping to change at</small><em> page 17, line 29</em></th><th> </th><th><a name="part-r15" /><small>skipping to change at</small><em> page 17, line 44</em></th><td></td></tr>
671      <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>
672      <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>
673      <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>
674      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
675      <tr><td class="lineno" valign="top"></td><td class="left">   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>
676      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
677      <tr><td class="lineno" valign="top"></td><td class="left">   The Last-Modified entity-header field value is often used as a cache</td><td> </td><td class="right">   The Last-Modified entity-header field value is often used as a cache</td><td class="lineno" valign="top"></td></tr>
678      <tr><td class="lineno" valign="top"></td><td class="left">   validator.  In simple terms, a cache entry is considered to be valid</td><td> </td><td class="right">   validator.  In simple terms, a cache entry is considered to be valid</td><td class="lineno" valign="top"></td></tr>
679      <tr><td class="lineno" valign="top"></td><td class="left">   if the entity has not been modified since the Last-Modified value.</td><td> </td><td class="right">   if the entity has not been modified since the Last-Modified value.</td><td class="lineno" valign="top"></td></tr>
680      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></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">8</span>.  IANA Considerations</td><td> </td><td class="rblock"><span class="insert">7</span>.  IANA Considerations</td><td class="lineno" valign="top"></td></tr>
683      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
684      <tr><td><a name="diff0045" /></td></tr>
685      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">8</span>.1.  Message Header Registration</td><td> </td><td class="rblock"><span class="insert">7</span>.1.  Message Header Registration</td><td class="lineno" valign="top"></td></tr>
686      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
687      <tr><td class="lineno" valign="top"></td><td class="left">   The Message Header Registry located at &lt;http://www.iana.org/</td><td> </td><td class="right">   The Message Header Registry located at &lt;http://www.iana.org/</td><td class="lineno" valign="top"></td></tr>
688      <tr><td class="lineno" valign="top"></td><td class="left">   assignments/message-headers/message-header-index.html&gt; should be</td><td> </td><td class="right">   assignments/message-headers/message-header-index.html&gt; should be</td><td class="lineno" valign="top"></td></tr>
689      <tr><td class="lineno" valign="top"></td><td class="left">   updated with the permanent registrations below (see [RFC3864]):</td><td> </td><td class="right">   updated with the permanent registrations below (see [RFC3864]):</td><td class="lineno" valign="top"></td></tr>
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">   +---------------------+----------+----------+-------------+</td><td> </td><td class="right">   +---------------------+----------+----------+-------------+</td><td class="lineno" valign="top"></td></tr>
692      <tr><td class="lineno" valign="top"></td><td class="left">   | Header Field Name   | Protocol | Status   | Reference   |</td><td> </td><td class="right">   | Header Field Name   | Protocol | Status   | Reference   |</td><td class="lineno" valign="top"></td></tr>
693      <tr><td class="lineno" valign="top"></td><td class="left">   +---------------------+----------+----------+-------------+</td><td> </td><td class="right">   +---------------------+----------+----------+-------------+</td><td class="lineno" valign="top"></td></tr>
694      <tr><td><a name="diff0046" /></td></tr>
695      <tr><td class="lineno" valign="top"></td><td class="lblock">   | ETag                | http     | standard | Section <span class="delete">7.1</span> |</td><td> </td><td class="rblock">   | ETag                | http     | standard | Section <span class="insert">6.1</span> |</td><td class="lineno" valign="top"></td></tr>
696      <tr><td class="lineno" valign="top"></td><td class="lblock">   | If-Match            | http     | standard | Section <span class="delete">7.2</span> |</td><td> </td><td class="rblock">   | If-Match            | http     | standard | Section <span class="insert">6.2</span> |</td><td class="lineno" valign="top"></td></tr>
697      <tr><td class="lineno" valign="top"></td><td class="lblock">   | If-Modified-Since   | http     | standard | Section <span class="delete">7.3</span> |</td><td> </td><td class="rblock">   | If-Modified-Since   | http     | standard | Section <span class="insert">6.3</span> |</td><td class="lineno" valign="top"></td></tr>
698      <tr><td class="lineno" valign="top"></td><td class="lblock">   | If-None-Match       | http     | standard | Section <span class="delete">7.4</span> |</td><td> </td><td class="rblock">   | If-None-Match       | http     | standard | Section <span class="insert">6.4</span> |</td><td class="lineno" valign="top"></td></tr>
699      <tr><td class="lineno" valign="top"></td><td class="lblock">   | If-Unmodified-Since | http     | standard | Section <span class="delete">7.5</span> |</td><td> </td><td class="rblock">   | If-Unmodified-Since | http     | standard | Section <span class="insert">6.5</span> |</td><td class="lineno" valign="top"></td></tr>
700      <tr><td class="lineno" valign="top"></td><td class="lblock">   | Last-Modified       | http     | standard | Section <span class="delete">7.6</span> |</td><td> </td><td class="rblock">   | Last-Modified       | http     | standard | Section <span class="insert">6.6</span> |</td><td class="lineno" valign="top"></td></tr>
701      <tr><td class="lineno" valign="top"></td><td class="left">   +---------------------+----------+----------+-------------+</td><td> </td><td class="right">   +---------------------+----------+----------+-------------+</td><td class="lineno" valign="top"></td></tr>
702      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
703      <tr><td class="lineno" valign="top"></td><td class="left">   The change controller is: "IETF (iesg@ietf.org) - Internet</td><td> </td><td class="right">   The change controller is: "IETF (iesg@ietf.org) - Internet</td><td class="lineno" valign="top"></td></tr>
704      <tr><td class="lineno" valign="top"></td><td class="left">   Engineering Task Force".</td><td> </td><td class="right">   Engineering Task Force".</td><td class="lineno" valign="top"></td></tr>
705      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
706      <tr><td><a name="diff0047" /></td></tr>
707      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">9</span>.  Security Considerations</td><td> </td><td class="rblock"><span class="insert">8</span>.  Security Considerations</td><td class="lineno" valign="top"></td></tr>
708      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
709      <tr><td class="lineno" valign="top"></td><td class="left">   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>
710      <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>
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="diff0048" /></td></tr>
713      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">10</span>.  Acknowledgments</td><td> </td><td class="rblock"><span class="insert">9</span>.  Acknowledgments</td><td class="lineno" valign="top"></td></tr>
714      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
715      <tr><td><a name="diff0049" /></td></tr>
716      <tr><td class="lineno" valign="top"></td><td class="lblock">1<span class="delete">1</span>.  References</td><td> </td><td class="rblock">1<span class="insert">0</span>.  References</td><td class="lineno" valign="top"></td></tr>
717      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
718      <tr><td><a name="diff0050" /></td></tr>
719      <tr><td class="lineno" valign="top"></td><td class="lblock">1<span class="delete">1</span>.1.  Normative References</td><td> </td><td class="rblock">1<span class="insert">0</span>.1.  Normative References</td><td class="lineno" valign="top"></td></tr>
720      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
721      <tr><td class="lineno" valign="top"></td><td class="left">   [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>
722      <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>
723      <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>
724      <tr><td><a name="diff0051" /></td></tr>
725      <tr><td class="lineno" valign="top"></td><td class="lblock">              and Message Parsing", <span class="delete">draft-ietf-httpbis-p1-messaging-05</span></td><td> </td><td class="rblock">              and Message Parsing", <span class="insert">draft-ietf-httpbis-p1-messaging-06</span></td><td class="lineno" valign="top"></td></tr>
726      <tr><td class="lineno" valign="top"></td><td class="lblock">              (work in progress), <span class="delete">November 2008.</span></td><td> </td><td class="rblock">              (work in progress), <span class="insert">March 2009.</span></td><td class="lineno" valign="top"></td></tr>
727      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
728      <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>
729      <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>
730      <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>
731      <tr><td><a name="diff0052" /></td></tr>
732      <tr><td class="lineno" valign="top"></td><td class="lblock">              Partial Responses", <span class="delete">draft-ietf-httpbis-p5-range-05</span> (work</td><td> </td><td class="rblock">              Partial Responses", <span class="insert">draft-ietf-httpbis-p5-range-06</span> (work</td><td class="lineno" valign="top"></td></tr>
733      <tr><td class="lineno" valign="top"></td><td class="lblock">              in progress), <span class="delete">November 2008.</span></td><td> </td><td class="rblock">              in progress), <span class="insert">March 2009.</span></td><td class="lineno" valign="top"></td></tr>
734      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
735      <tr><td class="lineno" 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>
736      <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><