Source: https://trac.ietf.org/trac/httpbis/browser/draft-ietf-httpbis/diffs/draft-ietf-httpbis-p4-conditional-05-from-4.diff.html?rev=648
Timestamp: 2020-08-14 03:03:48
Document Index: 445866867

Matched Legal Cases: ['art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art 4', 'art1', 'art1', 'art1', 'art1', 'art1', 'art1', 'art1', 'art1', 'art1', 'art5', 'art5', 'art5', 'art5', 'art 6', 'art 6', 'art2', 'art2']

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<title>Diff: draft-ietf-httpbis-p4-conditional-04.txt - draft-ietf-httpbis-p4-conditional-05.txt</title>
<tr bgcolor="orange"><th></th><th>&nbsp;draft-ietf-httpbis-p4-conditional-04.txt&nbsp;</th><th> </th><th>&nbsp;draft-ietf-httpbis-p4-conditional-05.txt&nbsp;</th><th></th></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock">Expires: Ma<span class="delete">rch 2, 2009</span> J. Mogul</td><td> </td><td class="rblock">Expires: Ma<span class="insert">y 20, 2009 </span> J. Mogul</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete"> August 29</span>, 2008</td><td> </td><td class="rblock"> <span class="insert">November 16</span>, 2008</td><td class="lineno" valign="top"></td></tr>
<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>
<tr><td class="lineno" valign="top"></td><td class="lblock"> draft-ietf-httpbis-p4-conditional-0<span class="delete">4</span></td><td> </td><td class="rblock"> draft-ietf-httpbis-p4-conditional-0<span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> This Internet-Draft will expire on Ma<span class="delete">rch 2</span>, 2009.</td><td> </td><td class="rblock"> This Internet-Draft will expire on Ma<span class="insert">y 20</span>, 2009.</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="lblock"> at &lt;http://<span class="delete">www.</span>tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td> </td><td class="rblock"> at &lt;http://tools.ietf.org/wg/httpbis/trac/report/11&gt; and related</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> &lt;http://<span class="delete">www.</span>tools.ietf.org/wg/httpbis/&gt;.</td><td> </td><td class="rblock"> &lt;http://tools.ietf.org/wg/httpbis/&gt;.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The changes in this draft are summarized in Appendix B.<span class="delete">4</span>.</td><td> </td><td class="rblock"> The changes in this draft are summarized in Appendix B.<span class="insert">6</span>.</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left"> 2. Notational Conventions and Generic Grammar . . . . . . . . . . 4</td><td> </td><td class="right"> 2. Notational Conventions and Generic Grammar . . . . . . . . . . 4</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 3. Entity Tags . . . . . . . . . . . . . . . . . . . . . . . . . 5</td><td> </td><td class="right"> 3. Entity Tags . . . . . . . . . . . . . . . . . . . . . . . . . 5</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 4. Status Code Definitions . . . . . . . . . . . . . . . . . . . 5</td><td> </td><td class="right"> 4. Status Code Definitions . . . . . . . . . . . . . . . . . . . 5</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 4.1. 304 Not Modified . . . . . . . . . . . . . . . . . . . . . 5</td><td> </td><td class="right"> 4.1. 304 Not Modified . . . . . . . . . . . . . . . . . . . . . 5</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 4.2. 412 Precondition Failed . . . . . . . . . . . . . . . . . 6</td><td> </td><td class="right"> 4.2. 412 Precondition Failed . . . . . . . . . . . . . . . . . 6</td><td class="lineno" valign="top"></td></tr>
<tr bgcolor="gray" ><td></td><th><a name="part-l3" /><small>skipping to change at</small><em> page 3, line 25</em></th><th> </th><th><a name="part-r3" /><small>skipping to change at</small><em> page 3, line 25</em></th><td></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 6. Rules for When to Use Entity Tags and Last-Modified Dates . . 9</td><td> </td><td class="right"> 6. Rules for When to Use Entity Tags and Last-Modified Dates . . 9</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 7. Header Field Definitions . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="right"> 7. Header Field Definitions . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 7.1. ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11</td><td> </td><td class="right"> 7.1. ETag . . . . . . . . . . . . . . . . . . . . . . . . . . . 11</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 7.2. If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 12</td><td> </td><td class="right"> 7.2. If-Match . . . . . . . . . . . . . . . . . . . . . . . . . 12</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 7.3. If-Modified-Since . . . . . . . . . . . . . . . . . . . . 13</td><td> </td><td class="right"> 7.3. If-Modified-Since . . . . . . . . . . . . . . . . . . . . 13</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 7.4. If-None-Match . . . . . . . . . . . . . . . . . . . . . . 14</td><td> </td><td class="right"> 7.4. If-None-Match . . . . . . . . . . . . . . . . . . . . . . 14</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 7.5. If-Unmodified-Since . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="right"> 7.5. If-Unmodified-Since . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 7.6. Last-Modified . . . . . . . . . . . . . . . . . . . . . . 16</td><td> </td><td class="right"> 7.6. Last-Modified . . . . . . . . . . . . . . . . . . . . . . 16</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17</td><td> </td><td class="right"> 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 8.1. Message Header Registration . . . . . . . . . . . . . . . 17</td><td> </td><td class="right"> 8.1. Message Header Registration . . . . . . . . . . . . . . . 17</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> 9. Security Considerations . . . . . . . . . . . . . . . . . . . 1<span class="delete">7</span></td><td> </td><td class="rblock"> 9. Security Considerations . . . . . . . . . . . . . . . . . . . 1<span class="insert">8</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right"> 10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right"> 11. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 11.1. Normative References . . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right"> 11.1. Normative References . . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> 11.2. Informative References . . . . . . . . . . . . . . . . . . 18</td><td> </td><td class="right"> 11.2. Informative References . . . . . . . . . . . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Appendix A. Compatibility with Previous Versions . . . . . . . . 18</td><td> </td><td class="right"> Appendix A. Compatibility with Previous Versions . . . . . . . . 18</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 1<span class="delete">8</span></td><td> </td><td class="rblock"> A.1. Changes from RFC 2616 . . . . . . . . . . . . . . . . . . 1<span class="insert">9</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> publication) . . . . . . . . . . . . . . . . . . . . 19</td><td> </td><td class="right"> publication) . . . . . . . . . . . . . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 19</td><td> </td><td class="right"> B.1. Since RFC2616 . . . . . . . . . . . . . . . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> B.2. Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 19</td><td> </td><td class="right"> B.2. Since draft-ietf-httpbis-p4-conditional-00 . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> B.3. Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 19</td><td> </td><td class="right"> B.3. Since draft-ietf-httpbis-p4-conditional-01 . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> B.4. Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . 19</td><td> </td><td class="right"> B.4. Since draft-ietf-httpbis-p4-conditional-02 . . . . . . . . 19</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> B.5. Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . <span class="delete">19</span></td><td> </td><td class="rblock"> B.5. Since draft-ietf-httpbis-p4-conditional-03 . . . . . . . . <span class="insert">20</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> B.6. Since draft-ietf-httpbis-p4-conditional-04 . . . . . . . . 20</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20</td><td> </td><td class="right"> Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21</td><td> </td><td class="right"> Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 21</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Intellectual Property and Copyright Statements . . . . . . . . . . 24</td><td> </td><td class="right"> Intellectual Property and Copyright Statements . . . . . . . . . . 24</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<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>
<tr bgcolor="gray" ><td></td><th><a name="part-l4" /><small>skipping to change at</small><em> page 4, line 47</em></th><th> </th><th><a name="part-r4" /><small>skipping to change at</small><em> page 4, line 47</em></th><td></td></tr>
<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left">2. Notational Conventions and Generic Grammar</td><td> </td><td class="right">2. Notational Conventions and Generic Grammar</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> This specification uses the ABNF syntax defined in Section 2.1 of</td><td> </td><td class="right"> This specification uses the ABNF syntax defined in Section 2.1 of</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> [Part1] and the core rules defined in Section 2.2 of [Part1]:</td><td> </td><td class="right"> [Part1] and the core rules defined in Section 2.2 of [Part1]:</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> [[abnf.dep: ABNF syntax and basic rules will be adopted from RFC</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"><span class="delete"> 5234, see &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/36&gt;.]]</span></td><td> </td><td class="rblock"></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> quoted-string = &lt;quoted-string, defined in [Part1], Section 2.2&gt;</td><td> </td><td class="right"> quoted-string = &lt;quoted-string, defined in [Part1], Section 2.2&gt;</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> OWS = &lt;OWS, defined in [Part1], Section 2.2&gt;</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> HTTP-date = &lt;HTTP-date, defined in [Part1], Section 3.3.1&gt;</td><td> </td><td class="right"> HTTP-date = &lt;HTTP-date, defined in [Part1], Section 3.3.1&gt;</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">3. Entity Tags</td><td> </td><td class="right">3. Entity Tags</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left"> (Section 7.1), If-Match (Section 7.2), If-None-Match (Section 7.4),</td><td> </td><td class="right"> (Section 7.1), If-Match (Section 7.2), If-None-Match (Section 7.4),</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> and If-Range (Section 6.3 of [Part5]) header fields. The definition</td><td> </td><td class="right"> and If-Range (Section 6.3 of [Part5]) header fields. The definition</td><td class="lineno" valign="top"></td></tr>
<tr bgcolor="gray" ><td></td><th><a name="part-l5" /><small>skipping to change at</small><em> page 11, line 30</em></th><th> </th><th><a name="part-r5" /><small>skipping to change at</small><em> page 11, line 27</em></th><td></td></tr>
<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left">7.1. ETag</td><td> </td><td class="right">7.1. ETag</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The <span class="delete">ETag response-header field</span> provides the current value of the</td><td> </td><td class="rblock"> The <span class="insert">response-header field "ETag"</span> provides the current value of the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> entity tag <span class="delete">for the requested variant. The headers used with entity</span></td><td> </td><td class="rblock"> entity tag <span class="insert">(see Section 3) for the requested variant. The headers</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">tags are described in Sections 7.2 and 7.4 of this document, and in</span></td><td> </td><td class="rblock"> <span class="insert">used with entity tags are described in Sections 7.2 and 7.4 of this</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">Section 6.3 of [Part5]. The entity tag MAY be used for comparison</span></td><td> </td><td class="rblock"> <span class="insert">document, and in Section 6.3 of [Part5]. The entity tag MAY be used</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">with other entities from the same resource (see Section 5).</span></td><td> </td><td class="rblock"> <span class="insert">for comparison with other entities from the same resource (see</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Section 5).</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> ETag <span class="delete">= "ETag" ":" entity-tag</span></td><td> </td><td class="rblock"> ETag <span class="insert"> = "ETag" ":" OWS ETag-v</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> ETag-v = entity-tag</span></td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
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<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>
<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>
<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left">7.2. If-Match</td><td> </td><td class="right">7.2. If-Match</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The <span class="delete">If-Match request-header field</span> is used with a method to make it</td><td> </td><td class="rblock"> The <span class="insert">request-header field "If-Match"</span> is used with a method to make it</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left"> If-Match header field. Entity tags are defined in Section 3. The</td><td> </td><td class="right"> If-Match header field. Entity tags are defined in Section 3. The</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Match <span class="delete">= "If-Match" ":" ( "*" | 1#entity-tag )</span></td><td> </td><td class="rblock"> If-Match <span class="insert"> = "If-Match" ":" OWS If-Match-v</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-Match-v = "*" / 1#entity-tag</span></td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left"> A server MUST use the strong comparison function (see Section 5) to</td><td> </td><td class="right"> A server MUST use the strong comparison function (see Section 5) to</td><td class="lineno" valign="top"></td></tr>
<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>
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<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>
<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left">7.3. If-Modified-Since</td><td> </td><td class="right">7.3. If-Modified-Since</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The <span class="delete">If-Modified-Since request-header field</span> is used with a method to</td><td> </td><td class="rblock"> The <span class="insert">request-header field "If-Modified-Since"</span> is used with a method to</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Modified-Since <span class="delete">= "If-Modified-Since" ":" HTTP-date</span></td><td> </td><td class="rblock"> If-Modified-Since <span class="insert"> = "If-Modified-Since" ":" OWS</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-Modified-Since-v</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-Modified-Since-v = HTTP-date</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> An example of the field is:</td><td> </td><td class="right"> An example of the field is:</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT</td><td> </td><td class="right"> If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> A GET method with an If-Modified-Since header and no Range header</td><td> </td><td class="right"> A GET method with an If-Modified-Since header and no Range header</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> requests that the identified entity be transferred only if it has</td><td> </td><td class="right"> requests that the identified entity be transferred only if it has</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> been modified since the date given by the If-Modified-Since header.</td><td> </td><td class="right"> been modified since the date given by the If-Modified-Since header.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> The algorithm for determining this includes the following cases:</td><td> </td><td class="right"> The algorithm for determining this includes the following cases:</td><td class="lineno" valign="top"></td></tr>
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<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left">7.4. If-None-Match</td><td> </td><td class="right">7.4. If-None-Match</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The <span class="delete">If-None-Match request-header field is used with a method to make</span></td><td> </td><td class="rblock"> The <span class="insert">request-header field "If-None-Match" is used with a method to</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">it conditional. A client that has one or more entities previously</span></td><td> </td><td class="rblock"> <span class="insert">make it conditional. A client that has one or more entities</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">obtained from the resource can verify that none of those entities is</span></td><td> </td><td class="rblock"> <span class="insert">previously obtained from the resource can verify that none of those</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">current by including a list of their associated entity tags in the</span></td><td> </td><td class="rblock"> <span class="insert">entities is current by including a list of their associated entity</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">If-None-Match header field. The purpose of this feature is to allow</span></td><td> </td><td class="rblock"> <span class="insert">tags in the If-None-Match header field. The purpose of this feature</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">efficient updates of cached information with a minimum amount of</span></td><td> </td><td class="rblock"> <span class="insert">is to allow efficient updates of cached information with a minimum</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">transaction overhead. It is also used to prevent a method (e.g.</span></td><td> </td><td class="rblock"> <span class="insert">amount of transaction overhead. It is also used to prevent a method</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">PUT) from inadvertently modifying an existing resource when the</span></td><td> </td><td class="rblock"> <span class="insert">(e.g. PUT) from inadvertently modifying an existing resource when</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> client believes that the resource does not exist.</td><td> </td><td class="rblock"> <span class="insert">the </span>client believes that the resource does not exist.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> As a special case, the value "*" matches any current entity of the</td><td> </td><td class="right"> As a special case, the value "*" matches any current entity of the</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> resource.</td><td> </td><td class="right"> resource.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> If-None-Match <span class="delete">= "If-None-Match" ":" ( "*" | 1#entity-tag )</span></td><td> </td><td class="rblock"> If-None-Match <span class="insert"> = "If-None-Match" ":" OWS If-None-Match-v</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-None-Match-v = "*" / 1#entity-tag</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> (without the If-None-Match header) on that resource, or if "*" is</td><td> </td><td class="right"> (without the If-None-Match header) on that resource, or if "*" is</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<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>
<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>
<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>
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<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>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left">7.5. If-Unmodified-Since</td><td> </td><td class="right">7.5. If-Unmodified-Since</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The <span class="delete">If-Unmodified-Since request-header field is used with a method to</span></td><td> </td><td class="rblock"> The <span class="insert">request-header field "If-Unmodified-Since" is used with a method</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">make it conditional. If the requested resource has not been modified</span></td><td> </td><td class="rblock"> <span class="insert">to make it conditional. If the requested resource has not been</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">since the time specified in this field, the server SHOULD perform the</span></td><td> </td><td class="rblock"> <span class="insert">modified since the time specified in this field, the server SHOULD</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">requested operation as if the If-Unmodified-Since header were not</span></td><td> </td><td class="rblock"> <span class="insert">perform the requested operation as if the If-Unmodified-Since header</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> present.</td><td> </td><td class="rblock"> <span class="insert">were not </span>present.</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="lblock"> If-Unmodified-Since <span class="delete">= "If-Unmodified-Since" ":" HTTP-date</span></td><td> </td><td class="rblock"> If-Unmodified-Since <span class="insert"> = "If-Unmodified-Since" ":" OWS</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-Unmodified-Since-v</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-Unmodified-Since-v = HTTP-date</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT</td><td> </td><td class="right"> If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT</td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<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>
<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>
<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>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left">7.6. Last-Modified</td><td> </td><td class="right">7.6. Last-Modified</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> The <span class="delete">Last-Modified entity-header field indicates the date and time at</span></td><td> </td><td class="rblock"> The <span class="insert">entity-header field "Last-Modified" indicates the date and time</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> which the origin server believes the variant was last modified.</td><td> </td><td class="rblock"> <span class="insert">at </span>which the origin server believes the variant was last modified.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Last-Modified <span class="delete">= "Last-Modified" ":" HTTP-date</span></td><td> </td><td class="rblock"> Last-Modified <span class="insert"> = "Last-Modified" ":" OWS Last-Modified-v</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Last-Modified-v = HTTP-date</span></td><td class="lineno" valign="top"></td></tr>
<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>
<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>
<tr><td class="lineno" valign="top"></td><td class="left"> The exact meaning of this header field depends on the implementation</td><td> </td><td class="right"> The exact meaning of this header field depends on the implementation</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> of the origin server and the nature of the original resource. For</td><td> </td><td class="right"> of the origin server and the nature of the original resource. For</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> files, it may be just the file system last-modified time. For</td><td> </td><td class="right"> files, it may be just the file system last-modified time. For</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> entities with dynamically included parts, it may be the most recent</td><td> </td><td class="right"> entities with dynamically included parts, it may be the most recent</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> of the set of last-modify times for its component parts. For</td><td> </td><td class="right"> of the set of last-modify times for its component parts. For</td><td class="lineno" valign="top"></td></tr>
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<tr><td class="lineno" valign="top"></td><td class="left">10. Acknowledgments</td><td> </td><td class="right">10. Acknowledgments</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">11. References</td><td> </td><td class="right">11. References</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">11.1. Normative References</td><td> </td><td class="right">11.1. Normative References</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> and Message Parsing", draft-ietf-httpbis-p1-messaging-0<span class="delete">4</span></td><td> </td><td class="rblock"> and Message Parsing", draft-ietf-httpbis-p1-messaging-0<span class="insert">5</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> (work in progress), <span class="delete">August</span> 2008.</td><td> </td><td class="rblock"> (work in progress), <span class="insert">November</span> 2008.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> Partial Responses", draft-ietf-httpbis-p5-range-0<span class="delete">4</span> (work</td><td> </td><td class="rblock"> Partial Responses", draft-ietf-httpbis-p5-range-0<span class="insert">5</span> (work</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> in progress), <span class="delete">August</span> 2008.</td><td> </td><td class="rblock"> in progress), <span class="insert">November</span> 2008.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",</td><td> </td><td class="right"> and J. Reschke, Ed., "HTTP/1.1, part 6: Caching",</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> draft-ietf-httpbis-p6-cache-0<span class="delete">4</span> (work in progress),</td><td> </td><td class="rblock"> draft-ietf-httpbis-p6-cache-0<span class="insert">5</span> (work in progress),</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">August</span> 2008.</td><td> </td><td class="rblock"> <span class="insert">November</span> 2008.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">11.2. Informative References</td><td> </td><td class="right">11.2. Informative References</td><td class="lineno" valign="top"></td></tr>
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<tr><td class="lineno" valign="top"></td><td class="left">Appendix B. Change Log (to be removed by RFC Editor before publication)</td><td> </td><td class="right">Appendix B. Change Log (to be removed by RFC Editor before publication)</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">B.1. Since RFC2616</td><td> </td><td class="right">B.1. Since RFC2616</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Extracted relevant partitions from [RFC2616].</td><td> </td><td class="right"> Extracted relevant partitions from [RFC2616].</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">B.2. Since draft-ietf-httpbis-p4-conditional-00</td><td> </td><td class="right">B.2. Since draft-ietf-httpbis-p4-conditional-00</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o &lt;http://<span class="delete">www3.tools.ietf.org/wg/httpbis/trac/ticket/35&gt;: "Normative</span></td><td> </td><td class="rblock"> o &lt;http://<span class="insert">tools.ietf.org/wg/httpbis/trac/ticket/35&gt;: "Normative and</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">and </span>Informative references"</td><td> </td><td class="rblock"> Informative references"</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Move definitions of 304 and 412 condition codes from Part2.</td><td> </td><td class="right"> o Move definitions of 304 and 412 condition codes from Part2.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">B.3. Since draft-ietf-httpbis-p4-conditional-01</td><td> </td><td class="right">B.3. Since draft-ietf-httpbis-p4-conditional-01</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Ongoing work on ABNF conversion</td><td> </td><td class="right"> Ongoing work on ABNF conversion</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> (&lt;http://<span class="delete">www3.</span>tools.ietf.org/wg/httpbis/trac/ticket/36&gt;):</td><td> </td><td class="rblock"> (&lt;http://tools.ietf.org/wg/httpbis/trac/ticket/36&gt;):</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">B.4. Since draft-ietf-httpbis-p4-conditional-02</td><td> </td><td class="right">B.4. Since draft-ietf-httpbis-p4-conditional-02</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o &lt;http://<span class="delete">www3.tools.ietf.org/wg/httpbis/trac/ticket/116&gt;: "Weak</span></td><td> </td><td class="rblock"> o &lt;http://<span class="insert">tools.ietf.org/wg/httpbis/trac/ticket/116&gt;: "Weak ETags on</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">ETags on </span>non-GET requests"</td><td> </td><td class="rblock"> non-GET requests"</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Ongoing work on IANA Message Header Registration</td><td> </td><td class="right"> Ongoing work on IANA Message Header Registration</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> (&lt;http://<span class="delete">www3.</span>tools.ietf.org/wg/httpbis/trac/ticket/40&gt;):</td><td> </td><td class="rblock"> (&lt;http://tools.ietf.org/wg/httpbis/trac/ticket/40&gt;):</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> o Reference RFC 3984, and update header registrations for headers</td><td> </td><td class="right"> o Reference RFC 3984, and update header registrations for headers</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> defined in this document.</td><td> </td><td class="right"> defined in this document.</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left">B.5. Since draft-ietf-httpbis-p4-conditional-03</td><td> </td><td class="right">B.5. Since draft-ietf-httpbis-p4-conditional-03</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o &lt;http://<span class="delete">www3.tools.ietf.org/wg/httpbis/trac/ticket/71&gt;: "Examples</span></td><td> </td><td class="rblock"> o &lt;http://<span class="insert">tools.ietf.org/wg/httpbis/trac/ticket/71&gt;: "Examples for</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">for </span>ETag matching"</td><td> </td><td class="rblock"> ETag matching"</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> o &lt;http://<span class="delete">www3.</span>tools.ietf.org/wg/httpbis/trac/ticket/124&gt;: "'entity</td><td> </td><td class="rblock"> o &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/124&gt;: "'entity</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> value' undefined"</td><td> </td><td class="right"> value' undefined"</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete">o &lt;http://www3.tools.ietf.org/wg/httpbis/trac/ticket/126&gt;: "bogus</span></td><td> </td><td class="rblock"> <span class="insert"> </span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"> <span class="delete"> 2068 Date header reference"</span></td><td> </td><td class="rblock"> <span class="insert">o &lt;http://tools.ietf.org/wg/httpbis/trac/ticket/126&gt;: "bogus 2068</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Date header reference"</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert">B.6. Since draft-ietf-httpbis-p4-conditional-04</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Ongoing work on ABNF conversion</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> (&lt;http://tools.ietf.org/wg/httpbis/trac/ticket/36&gt;):</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o Use "/" instead of "|" for alternatives.</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o Introduce new ABNF rules for "bad" whitespace ("BWS"), optional</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> whitespace ("OWS") and required whitespace ("RWS").</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> o Rewrite ABNFs to spell out whitespace rules, factor out header</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> value format definitions.</span></td><td class="lineno" valign="top"></td></tr>
<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>
<tr><td class="lineno" valign="top"></td><td class="left"> 304 Not Modified (status code) 5</td><td> </td><td class="right"> 304 Not Modified (status code) 5</td><td class="lineno" valign="top"></td></tr>
<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>
<tr><td class="lineno" valign="top"></td><td class="left"> 412 Precondition Failed (status code) 6</td><td> </td><td class="right"> 412 Precondition Failed (status code) 6</td><td class="lineno" valign="top"></td></tr>
<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>
<tr><td class="lineno" valign="top"></td><td class="left"> ETag header 11</td><td> </td><td class="right"> ETag header 11</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> G</td><td> </td><td class="right"> G</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Grammar</td><td> </td><td class="right"> Grammar</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> entity-tag 5</td><td> </td><td class="right"> entity-tag 5</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> ETag 11</td><td> </td><td class="right"> ETag 11</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> ETag-v 11</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> If-Match 12</td><td> </td><td class="right"> If-Match 12</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-Match-v 12</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> If-Modified-Since 13</td><td> </td><td class="right"> If-Modified-Since 13</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-Modified-Since-v 13</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match 15</td><td> </td><td class="right"> If-None-Match 15</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-None-Match-v 15</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> If-Unmodified-Since 16</td><td> </td><td class="right"> If-Unmodified-Since 16</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> If-Unmodified-Since-v 16</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Last-Modified 16</td><td> </td><td class="right"> Last-Modified 16</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="lblock"></td><td> </td><td class="rblock"><span class="insert"> Last-Modified-v 16</span></td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> opaque-tag 5</td><td> </td><td class="right"> opaque-tag 5</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> weak 5</td><td> </td><td class="right"> weak 5</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> Headers</td><td> </td><td class="right"> Headers</td><td class="lineno" valign="top"></td></tr>
<tr><td class="lineno" valign="top"></td><td class="left"> If-None-Match 14</td><td> </td><td class="right"> If-None-Match 14</td><td class="lineno" valign="top"></td></tr>
<tr bgcolor="gray"><th colspan="5" align="center"><a name="end">&nbsp;End of changes. 41 change blocks.&nbsp;</a></th></tr>
<tr class="stats"><td></td><th><i>59 lines changed or deleted</i></th><th><i> </i></th><th><i>88 lines changed or added</i></th><td></td></tr>