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38  <tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p4-conditional-22.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p4-conditional-23.txt&nbsp;</th><th></th></tr>
39      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
40      <tr><td class="lineno" valign="top"></td><td class="left">HTTPbis Working Group                                   R. Fielding, Ed.</td><td> </td><td class="right">HTTPbis Working Group                                   R. Fielding, Ed.</td><td class="lineno" valign="top"></td></tr>
41      <tr><td class="lineno" valign="top"></td><td class="left">Internet-Draft                                                     Adobe</td><td> </td><td class="right">Internet-Draft                                                     Adobe</td><td class="lineno" valign="top"></td></tr>
42      <tr><td class="lineno" valign="top"></td><td class="left">Obsoletes: 2616 (if approved)                            J. Reschke, Ed.</td><td> </td><td class="right">Obsoletes: 2616 (if approved)                            J. Reschke, Ed.</td><td class="lineno" valign="top"></td></tr>
43      <tr><td class="lineno" valign="top"></td><td class="left">Intended status: Standards Track                              greenbytes</td><td> </td><td class="right">Intended status: Standards Track                              greenbytes</td><td class="lineno" valign="top"></td></tr>
44      <tr><td><a name="diff0001" /></td></tr>
45      <tr><td class="lineno" valign="top"></td><td class="lblock">Expires: <span class="delete">August 27, 2013                               February 23</span>, 2013</td><td> </td><td class="rblock">Expires: <span class="insert">January 16, 2014                                  July 15</span>, 2013</td><td class="lineno" valign="top"></td></tr>
46      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
47      <tr><td class="lineno" valign="top"></td><td class="left">      Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests</td><td> </td><td class="right">      Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests</td><td class="lineno" valign="top"></td></tr>
48      <tr><td><a name="diff0002" /></td></tr>
49      <tr><td class="lineno" valign="top"></td><td class="lblock">                  draft-ietf-httpbis-p4-conditional-2<span class="delete">2</span></td><td> </td><td class="rblock">                  draft-ietf-httpbis-p4-conditional-2<span class="insert">3</span></td><td class="lineno" valign="top"></td></tr>
50      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
51      <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>
52      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
53      <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>
54      <tr><td class="lineno" valign="top"></td><td class="left">   protocol for distributed, collaborative, hypertext information</td><td> </td><td class="right">   protocol for distributed, collaborative, hypertext information</td><td class="lineno" valign="top"></td></tr>
55      <tr><td class="lineno" valign="top"></td><td class="left">   systems.  This document defines HTTP/1.1 conditional requests,</td><td> </td><td class="right">   systems.  This document defines HTTP/1.1 conditional requests,</td><td class="lineno" valign="top"></td></tr>
56      <tr><td class="lineno" valign="top"></td><td class="left">   including metadata header fields for indicating state changes,</td><td> </td><td class="right">   including metadata header fields for indicating state changes,</td><td class="lineno" valign="top"></td></tr>
57      <tr><td class="lineno" valign="top"></td><td class="left">   request header fields for making preconditions on such state, and</td><td> </td><td class="right">   request header fields for making preconditions on such state, and</td><td class="lineno" valign="top"></td></tr>
58      <tr><td class="lineno" valign="top"></td><td class="left">   rules for constructing the responses to a conditional request when</td><td> </td><td class="right">   rules for constructing the responses to a conditional request when</td><td class="lineno" valign="top"></td></tr>
59      <tr><td class="lineno" valign="top"></td><td class="left">   one or more preconditions evaluate to false.</td><td> </td><td class="right">   one or more preconditions evaluate to false.</td><td class="lineno" valign="top"></td></tr>
60      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
61      <tr bgcolor="gray" ><td></td><th><a name="part-l2" /><small>skipping to change at</small><em> page 1, line 33</em></th><th> </th><th><a name="part-r2" /><small>skipping to change at</small><em> page 1, line 33</em></th><td></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">   Discussion of this draft takes place on the HTTPBIS working group</td><td> </td><td class="right">   Discussion of this draft takes place on the HTTPBIS working group</td><td class="lineno" valign="top"></td></tr>
64      <tr><td class="lineno" valign="top"></td><td class="left">   mailing list (ietf-http-wg@w3.org), which is archived at</td><td> </td><td class="right">   mailing list (ietf-http-wg@w3.org), which is archived at</td><td class="lineno" valign="top"></td></tr>
65      <tr><td class="lineno" valign="top"></td><td class="left">   &lt;http://lists.w3.org/Archives/Public/ietf-http-wg/&gt;.</td><td> </td><td class="right">   &lt;http://lists.w3.org/Archives/Public/ietf-http-wg/&gt;.</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">   The current issues list is at</td><td> </td><td class="right">   The current issues list is at</td><td class="lineno" valign="top"></td></tr>
68      <tr><td class="lineno" valign="top"></td><td class="left">   &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td> </td><td class="right">   &lt;http://tools.ietf.org/wg/httpbis/trac/report/3&gt; and related</td><td class="lineno" valign="top"></td></tr>
69      <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>
70      <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>
71      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
72      <tr><td><a name="diff0003" /></td></tr>
73      <tr><td class="lineno" valign="top"></td><td class="lblock">   The changes in this draft are summarized in Appendix D.<span class="delete">3</span>.</td><td> </td><td class="rblock">   The changes in this draft are summarized in Appendix D.<span class="insert">4</span>.</td><td class="lineno" valign="top"></td></tr>
74      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
75      <tr><td 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>
76      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
77      <tr><td class="lineno" valign="top"></td><td class="left">   This Internet-Draft is submitted in full conformance with the</td><td> </td><td class="right">   This Internet-Draft is submitted in full conformance with the</td><td class="lineno" valign="top"></td></tr>
78      <tr><td class="lineno" valign="top"></td><td class="left">   provisions of BCP 78 and BCP 79.</td><td> </td><td class="right">   provisions of BCP 78 and BCP 79.</td><td class="lineno" valign="top"></td></tr>
79      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
80      <tr><td class="lineno" valign="top"></td><td class="left">   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>
81      <tr><td class="lineno" valign="top"></td><td class="left">   Task Force (IETF).  Note that other groups may also distribute</td><td> </td><td class="right">   Task Force (IETF).  Note that other groups may also distribute</td><td class="lineno" valign="top"></td></tr>
82      <tr><td class="lineno" valign="top"></td><td class="left">   working documents as Internet-Drafts.  The list of current Internet-</td><td> </td><td class="right">   working documents as Internet-Drafts.  The list of current Internet-</td><td class="lineno" valign="top"></td></tr>
83      <tr><td class="lineno" valign="top"></td><td class="left">   Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td> </td><td class="right">   Drafts is at http://datatracker.ietf.org/drafts/current/.</td><td class="lineno" valign="top"></td></tr>
84      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
85      <tr><td class="lineno" valign="top"></td><td class="left">   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>
86      <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>
87      <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>
88      <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>
89      <tr><td><a name="diff0004" /></td></tr>
90      <tr><td class="lineno" valign="top"></td><td class="lblock">   This Internet-Draft will expire on <span class="delete">August 27, 2013</span>.</td><td> </td><td class="rblock">   This Internet-Draft will expire on <span class="insert">January 16, 2014</span>.</td><td class="lineno" valign="top"></td></tr>
91      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
92      <tr><td class="lineno" valign="top"></td><td class="left">Copyright Notice</td><td> </td><td class="right">Copyright Notice</td><td class="lineno" valign="top"></td></tr>
93      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
94      <tr><td class="lineno" valign="top"></td><td class="left">   Copyright (c) 2013 IETF Trust and the persons identified as the</td><td> </td><td class="right">   Copyright (c) 2013 IETF Trust and the persons identified as the</td><td class="lineno" valign="top"></td></tr>
95      <tr><td class="lineno" valign="top"></td><td class="left">   document authors.  All rights reserved.</td><td> </td><td class="right">   document authors.  All rights reserved.</td><td class="lineno" valign="top"></td></tr>
96      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
97      <tr><td class="lineno" valign="top"></td><td class="left">   This document is subject to BCP 78 and the IETF Trust's Legal</td><td> </td><td class="right">   This document is subject to BCP 78 and the IETF Trust's Legal</td><td class="lineno" valign="top"></td></tr>
98      <tr><td class="lineno" valign="top"></td><td class="left">   Provisions Relating to IETF Documents</td><td> </td><td class="right">   Provisions Relating to IETF Documents</td><td class="lineno" valign="top"></td></tr>
99      <tr><td class="lineno" valign="top"></td><td class="left">   (http://trustee.ietf.org/license-info) in effect on the date of</td><td> </td><td class="right">   (http://trustee.ietf.org/license-info) in effect on the date of</td><td class="lineno" valign="top"></td></tr>
100      <tr><td class="lineno" valign="top"></td><td class="left">   publication of this document.  Please review these documents</td><td> </td><td class="right">   publication of this document.  Please review these documents</td><td class="lineno" valign="top"></td></tr>
101      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
102      <tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 3, line 47</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 3, line 47</em></th><td></td></tr>
103      <tr><td class="lineno" valign="top"></td><td class="left">     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 21</td><td> </td><td class="right">     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 21</td><td class="lineno" valign="top"></td></tr>
104      <tr><td class="lineno" valign="top"></td><td class="left">     9.2.  Informative References . . . . . . . . . . . . . . . . . . 22</td><td> </td><td class="right">     9.2.  Informative References . . . . . . . . . . . . . . . . . . 22</td><td class="lineno" valign="top"></td></tr>
105      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . 22</td><td> </td><td class="right">   Appendix A.  Changes from RFC 2616 . . . . . . . . . . . . . . . . 22</td><td class="lineno" valign="top"></td></tr>
106      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix B.  Imported ABNF . . . . . . . . . . . . . . . . . . . . 22</td><td> </td><td class="right">   Appendix B.  Imported ABNF . . . . . . . . . . . . . . . . . . . . 22</td><td class="lineno" valign="top"></td></tr>
107      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix C.  Collected ABNF  . . . . . . . . . . . . . . . . . . . 23</td><td> </td><td class="right">   Appendix C.  Collected ABNF  . . . . . . . . . . . . . . . . . . . 23</td><td class="lineno" valign="top"></td></tr>
108      <tr><td class="lineno" valign="top"></td><td class="left">   Appendix D.  Change Log (to be removed by RFC Editor before</td><td> </td><td class="right">   Appendix D.  Change Log (to be removed by RFC Editor before</td><td class="lineno" valign="top"></td></tr>
109      <tr><td class="lineno" valign="top"></td><td class="left">                publication)  . . . . . . . . . . . . . . . . . . . . 23</td><td> </td><td class="right">                publication)  . . . . . . . . . . . . . . . . . . . . 23</td><td class="lineno" valign="top"></td></tr>
110      <tr><td class="lineno" valign="top"></td><td class="left">     D.1.  Since draft-ietf-httpbis-p4-conditional-19 . . . . . . . . 23</td><td> </td><td class="right">     D.1.  Since draft-ietf-httpbis-p4-conditional-19 . . . . . . . . 23</td><td class="lineno" valign="top"></td></tr>
111      <tr><td class="lineno" valign="top"></td><td class="left">     D.2.  Since draft-ietf-httpbis-p4-conditional-20 . . . . . . . . 24</td><td> </td><td class="right">     D.2.  Since draft-ietf-httpbis-p4-conditional-20 . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
112      <tr><td class="lineno" valign="top"></td><td class="left">     D.3.  Since draft-ietf-httpbis-p4-conditional-21 . . . . . . . . 24</td><td> </td><td class="right">     D.3.  Since draft-ietf-httpbis-p4-conditional-21 . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
113      <tr><td><a name="diff0005" /></td></tr>
114      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">     D.4.  Since draft-ietf-httpbis-p4-conditional-22 . . . . . . . . 25</span></td><td class="lineno" valign="top"></td></tr>
115      <tr><td class="lineno" valign="top"></td><td class="left">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td> </td><td class="right">   Index  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25</td><td class="lineno" valign="top"></td></tr>
116      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
117      <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>
118      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
119      <tr><td class="lineno" valign="top"></td><td class="left">   Conditional requests are HTTP requests [Part2] that include one or</td><td> </td><td class="right">   Conditional requests are HTTP requests [Part2] that include one or</td><td class="lineno" valign="top"></td></tr>
120      <tr><td class="lineno" valign="top"></td><td class="left">   more header fields indicating a precondition to be tested before</td><td> </td><td class="right">   more header fields indicating a precondition to be tested before</td><td class="lineno" valign="top"></td></tr>
121      <tr><td class="lineno" valign="top"></td><td class="left">   applying the method semantics to the target resource.  This document</td><td> </td><td class="right">   applying the method semantics to the target resource.  This document</td><td class="lineno" valign="top"></td></tr>
122      <tr><td class="lineno" valign="top"></td><td class="left">   defines the HTTP/1.1 conditional request mechanisms in terms of the</td><td> </td><td class="right">   defines the HTTP/1.1 conditional request mechanisms in terms of the</td><td class="lineno" valign="top"></td></tr>
123      <tr><td class="lineno" valign="top"></td><td class="left">   architecture, syntax notation, and conformance criteria defined in</td><td> </td><td class="right">   architecture, syntax notation, and conformance criteria defined in</td><td class="lineno" valign="top"></td></tr>
124      <tr><td class="lineno" valign="top"></td><td class="left">   [Part1].</td><td> </td><td class="right">   [Part1].</td><td class="lineno" valign="top"></td></tr>
125      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
126      <tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 6, line 13</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 6, line 13</em></th><td></td></tr>
127      <tr><td class="lineno" valign="top"></td><td class="left">   representation always results in a unique node name and revision</td><td> </td><td class="right">   representation always results in a unique node name and revision</td><td class="lineno" valign="top"></td></tr>
128      <tr><td class="lineno" valign="top"></td><td class="left">   identifier being assigned before the representation is made</td><td> </td><td class="right">   identifier being assigned before the representation is made</td><td class="lineno" valign="top"></td></tr>
129      <tr><td class="lineno" valign="top"></td><td class="left">   accessible to GET.  A collision-resistant hash function applied to</td><td> </td><td class="right">   accessible to GET.  A collision-resistant hash function applied to</td><td class="lineno" valign="top"></td></tr>
130      <tr><td class="lineno" valign="top"></td><td class="left">   the representation data is also sufficient if the data is available</td><td> </td><td class="right">   the representation data is also sufficient if the data is available</td><td class="lineno" valign="top"></td></tr>
131      <tr><td class="lineno" valign="top"></td><td class="left">   prior to the response header fields being sent and the digest does</td><td> </td><td class="right">   prior to the response header fields being sent and the digest does</td><td class="lineno" valign="top"></td></tr>
132      <tr><td class="lineno" valign="top"></td><td class="left">   not need to be recalculated every time a validation request is</td><td> </td><td class="right">   not need to be recalculated every time a validation request is</td><td class="lineno" valign="top"></td></tr>
133      <tr><td class="lineno" valign="top"></td><td class="left">   received.  However, if a resource has distinct representations that</td><td> </td><td class="right">   received.  However, if a resource has distinct representations that</td><td class="lineno" valign="top"></td></tr>
134      <tr><td class="lineno" valign="top"></td><td class="left">   differ only in their metadata, such as might occur with content</td><td> </td><td class="right">   differ only in their metadata, such as might occur with content</td><td class="lineno" valign="top"></td></tr>
135      <tr><td class="lineno" valign="top"></td><td class="left">   negotiation over media types that happen to share the same data</td><td> </td><td class="right">   negotiation over media types that happen to share the same data</td><td class="lineno" valign="top"></td></tr>
136      <tr><td class="lineno" valign="top"></td><td class="left">   format, then the origin server SHOULD incorporate additional</td><td> </td><td class="right">   format, then the origin server SHOULD incorporate additional</td><td class="lineno" valign="top"></td></tr>
137      <tr><td><a name="diff0006" /></td></tr>
138      <tr><td class="lineno" valign="top"></td><td class="lblock">   information in the validator to distinguish those <span class="delete">representations and</span></td><td> </td><td class="rblock">   information in the validator to distinguish those <span class="insert">representations.</span></td><td class="lineno" valign="top"></td></tr>
139      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   avoid confusing cache behavior.</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
140      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
141      <tr><td class="lineno" valign="top"></td><td class="left">   In contrast, a "weak validator" is representation metadata that might</td><td> </td><td class="right">   In contrast, a "weak validator" is representation metadata that might</td><td class="lineno" valign="top"></td></tr>
142      <tr><td class="lineno" valign="top"></td><td class="left">   not change for every change to the representation data.  This</td><td> </td><td class="right">   not change for every change to the representation data.  This</td><td class="lineno" valign="top"></td></tr>
143      <tr><td class="lineno" valign="top"></td><td class="left">   weakness might be due to limitations in how the value is calculated,</td><td> </td><td class="right">   weakness might be due to limitations in how the value is calculated,</td><td class="lineno" valign="top"></td></tr>
144      <tr><td class="lineno" valign="top"></td><td class="left">   such as clock resolution or an inability to ensure uniqueness for all</td><td> </td><td class="right">   such as clock resolution or an inability to ensure uniqueness for all</td><td class="lineno" valign="top"></td></tr>
145      <tr><td class="lineno" valign="top"></td><td class="left">   possible representations of the resource, or due to a desire by the</td><td> </td><td class="right">   possible representations of the resource, or due to a desire by the</td><td class="lineno" valign="top"></td></tr>
146      <tr><td class="lineno" valign="top"></td><td class="left">   resource owner to group representations by some self-determined set</td><td> </td><td class="right">   resource owner to group representations by some self-determined set</td><td class="lineno" valign="top"></td></tr>
147      <tr><td class="lineno" valign="top"></td><td class="left">   of equivalency rather than unique sequences of data.  An origin</td><td> </td><td class="right">   of equivalency rather than unique sequences of data.  An origin</td><td class="lineno" valign="top"></td></tr>
148      <tr><td class="lineno" valign="top"></td><td class="left">   server SHOULD change a weak entity-tag whenever it considers prior</td><td> </td><td class="right">   server SHOULD change a weak entity-tag whenever it considers prior</td><td class="lineno" valign="top"></td></tr>
149      <tr><td class="lineno" valign="top"></td><td class="left">   representations to be unacceptable as a substitute for the current</td><td> </td><td class="right">   representations to be unacceptable as a substitute for the current</td><td class="lineno" valign="top"></td></tr>
150      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
151      <tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 11, line 24</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 11, line 24</em></th><td></td></tr>
152      <tr><td class="lineno" valign="top"></td><td class="left">     GET /index HTTP/1.1</td><td> </td><td class="right">     GET /index HTTP/1.1</td><td class="lineno" valign="top"></td></tr>
153      <tr><td class="lineno" valign="top"></td><td class="left">     Host: www.example.com</td><td> </td><td class="right">     Host: www.example.com</td><td class="lineno" valign="top"></td></tr>
154      <tr><td class="lineno" valign="top"></td><td class="left">     Accept-Encoding: gzip</td><td> </td><td class="right">     Accept-Encoding: gzip</td><td class="lineno" valign="top"></td></tr>
155      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
156      <tr><td class="lineno" valign="top"></td><td class="left">   In this case, the response might or might not use the gzip content</td><td> </td><td class="right">   In this case, the response might or might not use the gzip content</td><td class="lineno" valign="top"></td></tr>
157      <tr><td class="lineno" valign="top"></td><td class="left">   coding.  If it does not, the response might look like:</td><td> </td><td class="right">   coding.  If it does not, the response might look like:</td><td class="lineno" valign="top"></td></tr>
158      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
159      <tr><td class="lineno" valign="top"></td><td class="left">   &gt;&gt; Response:</td><td> </td><td class="right">   &gt;&gt; Response:</td><td class="lineno" valign="top"></td></tr>
160      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
161      <tr><td class="lineno" valign="top"></td><td class="left">     HTTP/1.1 200 OK</td><td> </td><td class="right">     HTTP/1.1 200 OK</td><td class="lineno" valign="top"></td></tr>
162      <tr><td><a name="diff0007" /></td></tr>
163      <tr><td class="lineno" valign="top"></td><td class="lblock">     Date: <span class="delete">Thu</span>, 26 Mar 2010 00:05:00 GMT</td><td> </td><td class="rblock">     Date: <span class="insert">Fri</span>, 26 Mar 2010 00:05:00 GMT</td><td class="lineno" valign="top"></td></tr>
164      <tr><td class="lineno" valign="top"></td><td class="left">     ETag: "123-a"</td><td> </td><td class="right">     ETag: "123-a"</td><td class="lineno" valign="top"></td></tr>
165      <tr><td class="lineno" valign="top"></td><td class="left">     Content-Length: 70</td><td> </td><td class="right">     Content-Length: 70</td><td class="lineno" valign="top"></td></tr>
166      <tr><td class="lineno" valign="top"></td><td class="left">     Vary: Accept-Encoding</td><td> </td><td class="right">     Vary: Accept-Encoding</td><td class="lineno" valign="top"></td></tr>
167      <tr><td class="lineno" valign="top"></td><td class="left">     Content-Type: text/plain</td><td> </td><td class="right">     Content-Type: text/plain</td><td class="lineno" valign="top"></td></tr>
168      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
169      <tr><td class="lineno" valign="top"></td><td class="left">     Hello World!</td><td> </td><td class="right">     Hello World!</td><td class="lineno" valign="top"></td></tr>
170      <tr><td class="lineno" valign="top"></td><td class="left">     Hello World!</td><td> </td><td class="right">     Hello World!</td><td class="lineno" valign="top"></td></tr>
171      <tr><td class="lineno" valign="top"></td><td class="left">     Hello World!</td><td> </td><td class="right">     Hello World!</td><td class="lineno" valign="top"></td></tr>
172      <tr><td class="lineno" valign="top"></td><td class="left">     Hello World!</td><td> </td><td class="right">     Hello World!</td><td class="lineno" valign="top"></td></tr>
173      <tr><td class="lineno" valign="top"></td><td class="left">     Hello World!</td><td> </td><td class="right">     Hello World!</td><td class="lineno" valign="top"></td></tr>
174      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
175      <tr><td class="lineno" valign="top"></td><td class="left">   An alternative representation that does use gzip content coding would</td><td> </td><td class="right">   An alternative representation that does use gzip content coding would</td><td class="lineno" valign="top"></td></tr>
176      <tr><td class="lineno" valign="top"></td><td class="left">   be:</td><td> </td><td class="right">   be:</td><td class="lineno" valign="top"></td></tr>
177      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
178      <tr><td class="lineno" valign="top"></td><td class="left">   &gt;&gt; Response:</td><td> </td><td class="right">   &gt;&gt; Response:</td><td class="lineno" valign="top"></td></tr>
179      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
180      <tr><td class="lineno" valign="top"></td><td class="left">     HTTP/1.1 200 OK</td><td> </td><td class="right">     HTTP/1.1 200 OK</td><td class="lineno" valign="top"></td></tr>
181      <tr><td><a name="diff0008" /></td></tr>
182      <tr><td class="lineno" valign="top"></td><td class="lblock">     Date: <span class="delete">Thu</span>, 26 Mar 2010 00:05:00 GMT</td><td> </td><td class="rblock">     Date: <span class="insert">Fri</span>, 26 Mar 2010 00:05:00 GMT</td><td class="lineno" valign="top"></td></tr>
183      <tr><td class="lineno" valign="top"></td><td class="left">     ETag: "123-b"</td><td> </td><td class="right">     ETag: "123-b"</td><td class="lineno" valign="top"></td></tr>
184      <tr><td class="lineno" valign="top"></td><td class="left">     Content-Length: 43</td><td> </td><td class="right">     Content-Length: 43</td><td class="lineno" valign="top"></td></tr>
185      <tr><td class="lineno" valign="top"></td><td class="left">     Vary: Accept-Encoding</td><td> </td><td class="right">     Vary: Accept-Encoding</td><td class="lineno" valign="top"></td></tr>
186      <tr><td class="lineno" valign="top"></td><td class="left">     Content-Type: text/plain</td><td> </td><td class="right">     Content-Type: text/plain</td><td class="lineno" valign="top"></td></tr>
187      <tr><td class="lineno" valign="top"></td><td class="left">     Content-Encoding: gzip</td><td> </td><td class="right">     Content-Encoding: gzip</td><td class="lineno" valign="top"></td></tr>
188      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
189      <tr><td class="lineno" valign="top"></td><td class="left">     ...binary data...</td><td> </td><td class="right">     ...binary data...</td><td class="lineno" valign="top"></td></tr>
190      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
191      <tr><td class="lineno" valign="top"></td><td class="left">      Note: Content codings are a property of the representation, so</td><td> </td><td class="right">      Note: Content codings are a property of the representation, so</td><td class="lineno" valign="top"></td></tr>
192      <tr><td class="lineno" valign="top"></td><td class="left">      therefore an entity-tag of an encoded representation has to be</td><td> </td><td class="right">      therefore an entity-tag of an encoded representation has to be</td><td class="lineno" valign="top"></td></tr>
193      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
194      <tr bgcolor="gray" ><td></td><th><a name="part-l6" /><small>skipping to change at</small><em> page 14, line 22</em></th><th> </th><th><a name="part-r6" /><small>skipping to change at</small><em> page 14, line 22</em></th><td></td></tr>
195      <tr><td class="lineno" valign="top"></td><td class="left">   efficient updates of cached information with a minimum amount of</td><td> </td><td class="right">   efficient updates of cached information with a minimum amount of</td><td class="lineno" valign="top"></td></tr>
196      <tr><td class="lineno" valign="top"></td><td class="left">   transaction overhead.  A client that has one or more representations</td><td> </td><td class="right">   transaction overhead.  A client that has one or more representations</td><td class="lineno" valign="top"></td></tr>
197      <tr><td class="lineno" valign="top"></td><td class="left">   previously obtained from the target resource can send If-None-Match</td><td> </td><td class="right">   previously obtained from the target resource can send If-None-Match</td><td class="lineno" valign="top"></td></tr>
198      <tr><td class="lineno" valign="top"></td><td class="left">   with a list of the associated entity-tags in the hope of receiving a</td><td> </td><td class="right">   with a list of the associated entity-tags in the hope of receiving a</td><td class="lineno" valign="top"></td></tr>
199      <tr><td class="lineno" valign="top"></td><td class="left">   304 (Not Modified) response if at least one of those representations</td><td> </td><td class="right">   304 (Not Modified) response if at least one of those representations</td><td class="lineno" valign="top"></td></tr>
200      <tr><td class="lineno" valign="top"></td><td class="left">   matches the selected representation.</td><td> </td><td class="right">   matches the selected representation.</td><td class="lineno" valign="top"></td></tr>
201      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
202      <tr><td class="lineno" valign="top"></td><td class="left">   If-None-Match can also be used with a value of "*" to prevent an</td><td> </td><td class="right">   If-None-Match can also be used with a value of "*" to prevent an</td><td class="lineno" valign="top"></td></tr>
203      <tr><td class="lineno" valign="top"></td><td class="left">   unsafe request method (e.g., PUT) from inadvertently modifying an</td><td> </td><td class="right">   unsafe request method (e.g., PUT) from inadvertently modifying an</td><td class="lineno" valign="top"></td></tr>
204      <tr><td class="lineno" valign="top"></td><td class="left">   existing representation of the target resource when the client</td><td> </td><td class="right">   existing representation of the target resource when the client</td><td class="lineno" valign="top"></td></tr>
205      <tr><td><a name="diff0009" /></td></tr>
206      <tr><td class="lineno" valign="top"></td><td class="lblock">   believes that the resource does not have a current <span class="delete">representation.</span></td><td> </td><td class="rblock">   believes that the resource does not have a current <span class="insert">representation</span></td><td class="lineno" valign="top"></td></tr>
207      <tr><td class="lineno" valign="top"></td><td class="lblock">   This is a variation on the "lost update" problem that might arise if</td><td> </td><td class="rblock"><span class="insert">   (Section 4.2.1 of [Part2]).</span>  This is a variation on the "lost update"</td><td class="lineno" valign="top"></td></tr>
208      <tr><td class="lineno" valign="top"></td><td class="lblock">   more than one client attempts to create an initial representation for</td><td> </td><td class="rblock">   problem that might arise if more than one client attempts to create</td><td class="lineno" valign="top"></td></tr>
209      <tr><td class="lineno" valign="top"></td><td class="lblock">   the target resource.</td><td> </td><td class="rblock">   an initial representation for the target resource.</td><td class="lineno" valign="top"></td></tr>
210      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
211      <tr><td class="lineno" valign="top"></td><td class="left">     If-None-Match = "*" / 1#entity-tag</td><td> </td><td class="right">     If-None-Match = "*" / 1#entity-tag</td><td class="lineno" valign="top"></td></tr>
212      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
213      <tr><td class="lineno" valign="top"></td><td class="left">   The If-None-Match condition is met if and only if none of the entity-</td><td> </td><td class="right">   The If-None-Match condition is met if and only if none of the entity-</td><td class="lineno" valign="top"></td></tr>
214      <tr><td class="lineno" valign="top"></td><td class="left">   tags listed in the If-None-Match field value match the entity-tag of</td><td> </td><td class="right">   tags listed in the If-None-Match field value match the entity-tag of</td><td class="lineno" valign="top"></td></tr>
215      <tr><td class="lineno" valign="top"></td><td class="left">   the selected representation using the weak comparison function (as</td><td> </td><td class="right">   the selected representation using the weak comparison function (as</td><td class="lineno" valign="top"></td></tr>
216      <tr><td class="lineno" valign="top"></td><td class="left">   per Section 2.3.2), or if "*" is given and no current representation</td><td> </td><td class="right">   per Section 2.3.2), or if "*" is given and no current representation</td><td class="lineno" valign="top"></td></tr>
217      <tr><td class="lineno" valign="top"></td><td class="left">   exists for that resource.</td><td> </td><td class="right">   exists for that resource.</td><td class="lineno" valign="top"></td></tr>
218      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
219      <tr><td class="lineno" valign="top"></td><td class="left">   If the condition is not met, the server MUST NOT perform the</td><td> </td><td class="right">   If the condition is not met, the server MUST NOT perform the</td><td class="lineno" valign="top"></td></tr>
220      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
221      <tr bgcolor="gray" ><td></td><th><a name="part-l7" /><small>skipping to change at</small><em> page 17, line 10</em></th><th> </th><th><a name="part-r7" /><small>skipping to change at</small><em> page 17, line 10</em></th><td></td></tr>
222      <tr><td class="lineno" valign="top"></td><td class="left">   The "If-Range" header field provides a special conditional request</td><td> </td><td class="right">   The "If-Range" header field provides a special conditional request</td><td class="lineno" valign="top"></td></tr>
223      <tr><td class="lineno" valign="top"></td><td class="left">   mechanism that is similar to If-Match and If-Unmodified-Since but</td><td> </td><td class="right">   mechanism that is similar to If-Match and If-Unmodified-Since but</td><td class="lineno" valign="top"></td></tr>
224      <tr><td class="lineno" valign="top"></td><td class="left">   specific to range requests.  If-Range is defined in Section 3.2 of</td><td> </td><td class="right">   specific to range requests.  If-Range is defined in Section 3.2 of</td><td class="lineno" valign="top"></td></tr>
225      <tr><td class="lineno" valign="top"></td><td class="left">   [Part5].</td><td> </td><td class="right">   [Part5].</td><td class="lineno" valign="top"></td></tr>
226      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
227      <tr><td class="lineno" valign="top"></td><td class="left">4.  Status Code Definitions</td><td> </td><td class="right">4.  Status Code Definitions</td><td class="lineno" valign="top"></td></tr>
228      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
229      <tr><td class="lineno" valign="top"></td><td class="left">4.1.  304 Not Modified</td><td> </td><td class="right">4.1.  304 Not Modified</td><td class="lineno" valign="top"></td></tr>
230      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
231      <tr><td class="lineno" valign="top"></td><td class="left">   The 304 (Not Modified) status code indicates that a conditional GET</td><td> </td><td class="right">   The 304 (Not Modified) status code indicates that a conditional GET</td><td class="lineno" valign="top"></td></tr>
232      <tr><td><a name="diff0010" /></td></tr>
233      <tr><td class="lineno" valign="top"></td><td class="lblock">   request has been received and would have resulted in a 200 (OK)</td><td> </td><td class="rblock">   <span class="insert">or HEAD</span> request has been received and would have resulted in a 200</td><td class="lineno" valign="top"></td></tr>
234      <tr><td class="lineno" valign="top"></td><td class="lblock">   response if it were not for the fact that the condition has evaluated</td><td> </td><td class="rblock">   (OK) response if it were not for the fact that the condition has</td><td class="lineno" valign="top"></td></tr>
235      <tr><td class="lineno" valign="top"></td><td class="lblock">   to false.  In other words, there is no need for the server to</td><td> </td><td class="rblock">   evaluated to false.  In other words, there is no need for the server</td><td class="lineno" valign="top"></td></tr>
236      <tr><td class="lineno" valign="top"></td><td class="lblock">   transfer a representation of the target resource because the request</td><td> </td><td class="rblock">   to transfer a representation of the target resource because the</td><td class="lineno" valign="top"></td></tr>
237      <tr><td class="lineno" valign="top"></td><td class="lblock">   indicates that the client, which made the request conditional,</td><td> </td><td class="rblock">   request indicates that the client, which made the request</td><td class="lineno" valign="top"></td></tr>
238      <tr><td class="lineno" valign="top"></td><td class="lblock">   already has a valid representation; the server is therefore</td><td> </td><td class="rblock">   conditional, already has a valid representation; the server is</td><td class="lineno" valign="top"></td></tr>
239      <tr><td class="lineno" valign="top"></td><td class="lblock">   redirecting the client to make use of that stored representation as</td><td> </td><td class="rblock">   therefore redirecting the client to make use of that stored</td><td class="lineno" valign="top"></td></tr>
240      <tr><td class="lineno" valign="top"></td><td class="lblock">   if it were the payload of a 200 (OK) response.</td><td> </td><td class="rblock">   representation as if it were the payload of a 200 (OK) response.</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 class="lineno" valign="top"></td><td class="left">   The server generating a 304 response MUST generate any of the</td><td> </td><td class="right">   The server generating a 304 response MUST generate any of the</td><td class="lineno" valign="top"></td></tr>
243      <tr><td class="lineno" valign="top"></td><td class="left">   following header fields that would have been sent in a 200 (OK)</td><td> </td><td class="right">   following header fields that would have been sent in a 200 (OK)</td><td class="lineno" valign="top"></td></tr>
244      <tr><td class="lineno" valign="top"></td><td class="left">   response to the same request: Cache-Control, Content-Location, ETag,</td><td> </td><td class="right">   response to the same request: Cache-Control, Content-Location, ETag,</td><td class="lineno" valign="top"></td></tr>
245      <tr><td class="lineno" valign="top"></td><td class="left">   Expires, and Vary.</td><td> </td><td class="right">   Expires, and Vary.</td><td class="lineno" valign="top"></td></tr>
246      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
247      <tr><td class="lineno" valign="top"></td><td class="left">   Since the goal of a 304 response is to minimize information transfer</td><td> </td><td class="right">   Since the goal of a 304 response is to minimize information transfer</td><td class="lineno" valign="top"></td></tr>
248      <tr><td class="lineno" valign="top"></td><td class="left">   when the recipient already has one or more cached representations, a</td><td> </td><td class="right">   when the recipient already has one or more cached representations, a</td><td class="lineno" valign="top"></td></tr>
249      <tr><td class="lineno" valign="top"></td><td class="left">   sender SHOULD NOT generate representation metadata other than the</td><td> </td><td class="right">   sender SHOULD NOT generate representation metadata other than the</td><td class="lineno" valign="top"></td></tr>
250      <tr><td class="lineno" valign="top"></td><td class="left">   above listed fields unless said metadata exists for the purpose of</td><td> </td><td class="right">   above listed fields unless said metadata exists for the purpose of</td><td class="lineno" valign="top"></td></tr>
251      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
252      <tr bgcolor="gray" ><td></td><th><a name="part-l8" /><small>skipping to change at</small><em> page 20, line 27</em></th><th> </th><th><a name="part-r8" /><small>skipping to change at</small><em> page 20, line 27</em></th><td></td></tr>
253      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
254      <tr><td class="lineno" valign="top"></td><td class="left">   +-------+---------------------+-------------+</td><td> </td><td class="right">   +-------+---------------------+-------------+</td><td class="lineno" valign="top"></td></tr>
255      <tr><td class="lineno" valign="top"></td><td class="left">   | Value | Description         | Reference   |</td><td> </td><td class="right">   | Value | Description         | Reference   |</td><td class="lineno" valign="top"></td></tr>
256      <tr><td class="lineno" valign="top"></td><td class="left">   +-------+---------------------+-------------+</td><td> </td><td class="right">   +-------+---------------------+-------------+</td><td class="lineno" valign="top"></td></tr>
257      <tr><td class="lineno" valign="top"></td><td class="left">   | 304   | Not Modified        | Section 4.1 |</td><td> </td><td class="right">   | 304   | Not Modified        | Section 4.1 |</td><td class="lineno" valign="top"></td></tr>
258      <tr><td class="lineno" valign="top"></td><td class="left">   | 412   | Precondition Failed | Section 4.2 |</td><td> </td><td class="right">   | 412   | Precondition Failed | Section 4.2 |</td><td class="lineno" valign="top"></td></tr>
259      <tr><td class="lineno" valign="top"></td><td class="left">   +-------+---------------------+-------------+</td><td> </td><td class="right">   +-------+---------------------+-------------+</td><td class="lineno" valign="top"></td></tr>
260      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
261      <tr><td class="lineno" valign="top"></td><td class="left">6.2.  Header Field Registration</td><td> </td><td class="right">6.2.  Header Field Registration</td><td class="lineno" valign="top"></td></tr>
262      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
263      <tr><td><a name="diff0011" /></td></tr>
264      <tr><td class="lineno" valign="top"></td><td class="lblock">   <span class="delete">The</span> Message Header Field Registry <span class="delete">located</span> at <span class="delete">&lt;http://www.iana.org/</span></td><td> </td><td class="rblock">   <span class="insert">HTTP header fields are registered within the</span> Message Header Field</td><td class="lineno" valign="top"></td></tr>
265      <tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete">   assignments/message-headers/message-header-index.html&gt;</span> shall be</td><td> </td><td class="rblock">   Registry <span class="insert">maintained</span> at <span class="insert">&lt;http://www.iana.org/assignments/</span></td><td class="lineno" valign="top"></td></tr>
266      <tr><td class="lineno" valign="top"></td><td class="lblock">   updated <span class="delete">with</span> the permanent registrations below (see [BCP90]):</td><td> </td><td class="rblock"><span class="insert">   message-headers/message-header-index.html&gt;.</span></td><td class="lineno" valign="top"></td></tr>
267      <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>
268      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   This document defines the following HTTP header fields, so their</span></td><td class="lineno" valign="top"></td></tr>
269      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   associated registry entries</span> shall be updated <span class="insert">according to</span> the</td><td class="lineno" valign="top"></td></tr>
270      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   permanent registrations below (see [BCP90]):</td><td class="lineno" valign="top"></td></tr>
271      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
272      <tr><td class="lineno" valign="top"></td><td class="left">   +---------------------+----------+----------+-------------+</td><td> </td><td class="right">   +---------------------+----------+----------+-------------+</td><td class="lineno" valign="top"></td></tr>
273      <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>
274      <tr><td class="lineno" valign="top"></td><td class="left">   +---------------------+----------+----------+-------------+</td><td> </td><td class="right">   +---------------------+----------+----------+-------------+</td><td class="lineno" valign="top"></td></tr>
275      <tr><td class="lineno" valign="top"></td><td class="left">   | ETag                | http     | standard | Section 2.3 |</td><td> </td><td class="right">   | ETag                | http     | standard | Section 2.3 |</td><td class="lineno" valign="top"></td></tr>
276      <tr><td class="lineno" valign="top"></td><td class="left">   | If-Match            | http     | standard | Section 3.1 |</td><td> </td><td class="right">   | If-Match            | http     | standard | Section 3.1 |</td><td class="lineno" valign="top"></td></tr>
277      <tr><td class="lineno" valign="top"></td><td class="left">   | If-Modified-Since   | http     | standard | Section 3.3 |</td><td> </td><td class="right">   | If-Modified-Since   | http     | standard | Section 3.3 |</td><td class="lineno" valign="top"></td></tr>
278      <tr><td class="lineno" valign="top"></td><td class="left">   | If-None-Match       | http     | standard | Section 3.2 |</td><td> </td><td class="right">   | If-None-Match       | http     | standard | Section 3.2 |</td><td class="lineno" valign="top"></td></tr>
279      <tr><td class="lineno" valign="top"></td><td class="left">   | If-Unmodified-Since | http     | standard | Section 3.4 |</td><td> </td><td class="right">   | If-Unmodified-Since | http     | standard | Section 3.4 |</td><td class="lineno" valign="top"></td></tr>
280      <tr><td class="lineno" valign="top"></td><td class="left">   | Last-Modified       | http     | standard | Section 2.2 |</td><td> </td><td class="right">   | Last-Modified       | http     | standard | Section 2.2 |</td><td class="lineno" valign="top"></td></tr>
281      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
282      <tr bgcolor="gray" ><td></td><th><a name="part-l9" /><small>skipping to change at</small><em> page 21, line 33</em></th><th> </th><th><a name="part-r9" /><small>skipping to change at</small><em> page 21, line 37</em></th><td></td></tr>
283      <tr><td class="lineno" valign="top"></td><td class="left">8.  Acknowledgments</td><td> </td><td class="right">8.  Acknowledgments</td><td class="lineno" valign="top"></td></tr>
284      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
285      <tr><td class="lineno" valign="top"></td><td class="left">   See Section 9 of [Part1].</td><td> </td><td class="right">   See Section 9 of [Part1].</td><td class="lineno" valign="top"></td></tr>
286      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
287      <tr><td class="lineno" valign="top"></td><td class="left">9.  References</td><td> </td><td class="right">9.  References</td><td class="lineno" valign="top"></td></tr>
288      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
289      <tr><td class="lineno" valign="top"></td><td class="left">9.1.  Normative References</td><td> </td><td class="right">9.1.  Normative References</td><td class="lineno" valign="top"></td></tr>
290      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
291      <tr><td class="lineno" valign="top"></td><td class="left">   [Part1]    Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer</td><td> </td><td class="right">   [Part1]    Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer</td><td class="lineno" valign="top"></td></tr>
292      <tr><td class="lineno" valign="top"></td><td class="left">              Protocol (HTTP/1.1): Message Syntax and Routing",</td><td> </td><td class="right">              Protocol (HTTP/1.1): Message Syntax and Routing",</td><td class="lineno" valign="top"></td></tr>
293      <tr><td><a name="diff0012" /></td></tr>
294      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">draft-ietf-httpbis-p1-messaging-22</span> (work in progress),</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p1-messaging-23</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
295      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">February</span> 2013.</td><td> </td><td class="rblock">              <span class="insert">July</span> 2013.</td><td class="lineno" valign="top"></td></tr>
296      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
297      <tr><td class="lineno" valign="top"></td><td class="left">   [Part2]    Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer</td><td> </td><td class="right">   [Part2]    Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer</td><td class="lineno" valign="top"></td></tr>
298      <tr><td class="lineno" valign="top"></td><td class="left">              Protocol (HTTP/1.1): Semantics and Content",</td><td> </td><td class="right">              Protocol (HTTP/1.1): Semantics and Content",</td><td class="lineno" valign="top"></td></tr>
299      <tr><td><a name="diff0013" /></td></tr>
300      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">draft-ietf-httpbis-p2-semantics-22</span> (work in progress),</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p2-semantics-23</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
301      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">February</span> 2013.</td><td> </td><td class="rblock">              <span class="insert">July</span> 2013.</td><td class="lineno" valign="top"></td></tr>
302      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
303      <tr><td class="lineno" valign="top"></td><td class="left">   [Part5]    Fielding, R., Ed., Lafon, Y., Ed., and J. Reschke, Ed.,</td><td> </td><td class="right">   [Part5]    Fielding, R., Ed., Lafon, Y., Ed., and J. Reschke, Ed.,</td><td class="lineno" valign="top"></td></tr>
304      <tr><td class="lineno" valign="top"></td><td class="left">              "Hypertext Transfer Protocol (HTTP/1.1): Range Requests",</td><td> </td><td class="right">              "Hypertext Transfer Protocol (HTTP/1.1): Range Requests",</td><td class="lineno" valign="top"></td></tr>
305      <tr><td><a name="diff0014" /></td></tr>
306      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">draft-ietf-httpbis-p5-range-22</span> (work in progress),</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p5-range-23</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
307      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">February</span> 2013.</td><td> </td><td class="rblock">              <span class="insert">July</span> 2013.</td><td class="lineno" valign="top"></td></tr>
308      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
309      <tr><td class="lineno" valign="top"></td><td class="left">   [Part6]    Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,</td><td> </td><td class="right">   [Part6]    Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,</td><td class="lineno" valign="top"></td></tr>
310      <tr><td class="lineno" valign="top"></td><td class="left">              Ed., "Hypertext Transfer Protocol (HTTP/1.1): Caching",</td><td> </td><td class="right">              Ed., "Hypertext Transfer Protocol (HTTP/1.1): Caching",</td><td class="lineno" valign="top"></td></tr>
311      <tr><td><a name="diff0015" /></td></tr>
312      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">draft-ietf-httpbis-p6-cache-22</span> (work in progress),</td><td> </td><td class="rblock">              <span class="insert">draft-ietf-httpbis-p6-cache-23</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
313      <tr><td class="lineno" valign="top"></td><td class="lblock">              <span class="delete">February</span> 2013.</td><td> </td><td class="rblock">              <span class="insert">July</span> 2013.</td><td class="lineno" valign="top"></td></tr>
314      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
315      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate</td><td> </td><td class="right">   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate</td><td class="lineno" valign="top"></td></tr>
316      <tr><td class="lineno" valign="top"></td><td class="left">              Requirement Levels", BCP 14, RFC 2119, March 1997.</td><td> </td><td class="right">              Requirement Levels", BCP 14, RFC 2119, March 1997.</td><td class="lineno" valign="top"></td></tr>
317      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
318      <tr><td class="lineno" valign="top"></td><td class="left">   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax</td><td> </td><td class="right">   [RFC5234]  Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax</td><td class="lineno" valign="top"></td></tr>
319      <tr><td class="lineno" valign="top"></td><td class="left">              Specifications: ABNF", STD 68, RFC 5234, January 2008.</td><td> </td><td class="right">              Specifications: ABNF", STD 68, RFC 5234, January 2008.</td><td class="lineno" valign="top"></td></tr>
320      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
321      <tr><td class="lineno" valign="top"></td><td class="left">9.2.  Informative References</td><td> </td><td class="right">9.2.  Informative References</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">   [BCP90]    Klyne, G., Nottingham, M., and J. Mogul, "Registration</td><td> </td><td class="right">   [BCP90]    Klyne, G., Nottingham, M., and J. Mogul, "Registration</td><td class="lineno" valign="top"></td></tr>
324      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
325      <tr bgcolor="gray" ><td></td><th><a name="part-l10" /><small>skipping to change at</small><em> page 23, line 12</em></th><th> </th><th><a name="part-r10" /><small>skipping to change at</small><em> page 23, line 16</em></th><td></td></tr>
326      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
327      <tr><td class="lineno" valign="top"></td><td class="left">     OWS           = &lt;OWS, defined in [Part1], Section 3.2.3&gt;</td><td> </td><td class="right">     OWS           = &lt;OWS, defined in [Part1], Section 3.2.3&gt;</td><td class="lineno" valign="top"></td></tr>
328      <tr><td class="lineno" valign="top"></td><td class="left">     obs-text      = &lt;obs-text, defined in [Part1], Section 3.2.6&gt;</td><td> </td><td class="right">     obs-text      = &lt;obs-text, defined in [Part1], Section 3.2.6&gt;</td><td class="lineno" valign="top"></td></tr>
329      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
330      <tr><td class="lineno" valign="top"></td><td class="left">   The rules below are defined in other parts:</td><td> </td><td class="right">   The rules below are defined in other parts:</td><td class="lineno" valign="top"></td></tr>
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">     HTTP-date     = &lt;HTTP-date, defined in [Part2], Section 7.1.1.1&gt;</td><td> </td><td class="right">     HTTP-date     = &lt;HTTP-date, defined in [Part2], Section 7.1.1.1&gt;</td><td class="lineno" valign="top"></td></tr>
333      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
334      <tr><td class="lineno" valign="top"></td><td class="left">Appendix C.  Collected ABNF</td><td> </td><td class="right">Appendix C.  Collected ABNF</td><td class="lineno" valign="top"></td></tr>
335      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
336      <tr><td><a name="diff0016" /></td></tr>
337      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">   <span class="insert">In the collected ABNF below, list rules are expanded as per Section</span></td><td class="lineno" valign="top"></td></tr>
338      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   1.2 of [Part1].</span></td><td class="lineno" valign="top"></td></tr>
339      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
340      <tr><td class="lineno" valign="top"></td><td class="left">   ETag = entity-tag</td><td> </td><td class="right">   ETag = entity-tag</td><td class="lineno" valign="top"></td></tr>
341      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
342      <tr><td class="lineno" valign="top"></td><td class="left">   HTTP-date = &lt;HTTP-date, defined in [Part2], Section 7.1.1.1&gt;</td><td> </td><td class="right">   HTTP-date = &lt;HTTP-date, defined in [Part2], Section 7.1.1.1&gt;</td><td class="lineno" valign="top"></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">   If-Match = "*" / ( *( "," OWS ) entity-tag *( OWS "," [ OWS</td><td> </td><td class="right">   If-Match = "*" / ( *( "," OWS ) entity-tag *( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
345      <tr><td class="lineno" valign="top"></td><td class="left">    entity-tag ] ) )</td><td> </td><td class="right">    entity-tag ] ) )</td><td class="lineno" valign="top"></td></tr>
346      <tr><td class="lineno" valign="top"></td><td class="left">   If-Modified-Since = HTTP-date</td><td> </td><td class="right">   If-Modified-Since = HTTP-date</td><td class="lineno" valign="top"></td></tr>
347      <tr><td class="lineno" valign="top"></td><td class="left">   If-None-Match = "*" / ( *( "," OWS ) entity-tag *( OWS "," [ OWS</td><td> </td><td class="right">   If-None-Match = "*" / ( *( "," OWS ) entity-tag *( OWS "," [ OWS</td><td class="lineno" valign="top"></td></tr>
348      <tr><td class="lineno" valign="top"></td><td class="left">    entity-tag ] ) )</td><td> </td><td class="right">    entity-tag ] ) )</td><td class="lineno" valign="top"></td></tr>
349      <tr><td class="lineno" valign="top"></td><td class="left">   If-Unmodified-Since = HTTP-date</td><td> </td><td class="right">   If-Unmodified-Since = HTTP-date</td><td class="lineno" valign="top"></td></tr>
350      <tr><td class="lineno"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno"></td></tr>
351      <tr bgcolor="gray" ><td></td><th><a name="part-l11" /><small>skipping to change at</small><em> page 25, line 8</em></th><th> </th><th><a name="part-r11" /><small>skipping to change at</small><em> page 25, line 14</em></th><td></td></tr>
352      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
353      <tr><td class="lineno" valign="top"></td><td class="left">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/402&gt;: "Comparison</td><td> </td><td class="right">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/402&gt;: "Comparison</td><td class="lineno" valign="top"></td></tr>
354      <tr><td class="lineno" valign="top"></td><td class="left">      function for If-Match and If-None-Match"</td><td> </td><td class="right">      function for If-Match and If-None-Match"</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">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/406&gt;: "304 without</td><td> </td><td class="right">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/406&gt;: "304 without</td><td class="lineno" valign="top"></td></tr>
357      <tr><td class="lineno" valign="top"></td><td class="left">      validator"</td><td> </td><td class="right">      validator"</td><td class="lineno" valign="top"></td></tr>
358      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
359      <tr><td class="lineno" valign="top"></td><td class="left">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/427&gt;: "If-Match and</td><td> </td><td class="right">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/427&gt;: "If-Match and</td><td class="lineno" valign="top"></td></tr>
360      <tr><td class="lineno" valign="top"></td><td class="left">      428"</td><td> </td><td class="right">      428"</td><td class="lineno" valign="top"></td></tr>
361      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
362      <tr><td><a name="diff0017" /></td></tr>
363      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">D.4.  Since draft-ietf-httpbis-p4-conditional-22</span></td><td class="lineno" valign="top"></td></tr>
364      <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>
365      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Closed issues:</span></td><td class="lineno" valign="top"></td></tr>
366      <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>
367      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/436&gt;: "explain list</span></td><td class="lineno" valign="top"></td></tr>
368      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      expansion in ABNF appendices"</span></td><td class="lineno" valign="top"></td></tr>
369      <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>
370      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/437&gt;: "incorrect</span></td><td class="lineno" valign="top"></td></tr>
371      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      example dates"</span></td><td class="lineno" valign="top"></td></tr>
372      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"></span></td><td class="lineno" valign="top"></td></tr>
373      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   Partly resolved issues:</span></td><td class="lineno" valign="top"></td></tr>
374      <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>
375      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">   o  &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/461&gt;: "Editorial</span></td><td class="lineno" valign="top"></td></tr>
376      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">      suggestions"</span></td><td class="lineno" valign="top"></td></tr>
377      <tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock">                                                                         </td><td class="lineno" valign="top"></td></tr>
378      <tr><td class="lineno" valign="top"></td><td class="left">Index</td><td> </td><td class="right">Index</td><td class="lineno" valign="top"></td></tr>
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">   3</td><td> </td><td class="right">   3</td><td class="lineno" valign="top"></td></tr>
381      <tr><td class="lineno" valign="top"></td><td class="left">      304 Not Modified (status code)  17</td><td> </td><td class="right">      304 Not Modified (status code)  17</td><td class="lineno" valign="top"></td></tr>
382      <tr><td class="lineno" valign="top"></td><td class="left"></td><td> </td><td class="right"></td><td class="lineno" valign="top"></td></tr>
383      <tr><td class="lineno" valign="top"></td><td class="left">   4</td><td> </td><td class="right">   4</td><td class="lineno" valign="top"></td></tr>
384      <tr><td class="lineno" valign="top"></td><td class="left">      412 Precondition Failed (status code)  17</td><td> </td><td class="right">      412 Precondition Failed (status code)  17</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">   E</td><td> </td><td class="right">   E</td><td class="lineno" valign="top"></td></tr>
387      <tr><td class="lineno" valign="top"></td><td class="left">      ETag header field  9</td><td> </td><td class="right">      ETag header field  9</td><td class="lineno" valign="top"></td></tr>
388
389     <tr><td></td><td class="left"></td><td> </td><td class="right"></td><td></td></tr>
390     <tr bgcolor="gray"><th colspan="5" align="center"><a name="end">&nbsp;End of changes. 17 change blocks.&nbsp;</a></th></tr>
391     <tr class="stats"><td></td><th><i>31 lines changed or deleted</i></th><th><i> </i></th><th><i>53 lines changed or added</i></th><td></td></tr>
392     <tr><td colspan="5" align="center" class="small"><br/>This html diff was produced by rfcdiff 1.38. The latest version is available from <a href="http://www.tools.ietf.org/tools/rfcdiff/" >http://tools.ietf.org/tools/rfcdiff/</a> </td></tr>
393   </table>
394   </body>
395   </html>
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