Ignore:
Timestamp:
Sep 1, 2011, 1:55:31 AM (8 years ago)
Author:
julian.reschke@…
Message:

explain types of redirects, history of changes, and allow POST->GET rewriting for 301/302 (see [160])

File:
1 edited

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  • draft-ietf-httpbis/latest/p2-semantics.html

    r1427 r1428  
    16931693      <h2 id="rfc.section.7.3"><a href="#rfc.section.7.3">7.3</a>&nbsp;<a id="status.3xx" href="#status.3xx">Redirection 3xx</a></h2>
    16941694      <p id="rfc.section.7.3.p.1">This class of status code indicates that further action needs to be taken by the user agent in order to fulfill the request.
    1695          The action required <em class="bcp14">MAY</em> be carried out by the user agent without interaction with the user if and only if the method used in the second request is
    1696          known to be "safe", as defined in <a href="#safe.methods" title="Safe Methods">Section&nbsp;6.1.1</a>. A client <em class="bcp14">SHOULD</em> detect infinite redirection loops, since such loops generate network traffic for each redirection.
    1697       </p>
    1698       <div class="note" id="rfc.section.7.3.p.2">
    1699          <p> <b>Note:</b> An earlier version of this specification recommended a maximum of five redirections (<a href="#RFC2068" id="rfc.xref.RFC2068.1"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2068]</cite></a>, <a href="http://tools.ietf.org/html/rfc2068#section-10.3">Section 10.3</a>). Content developers need to be aware that some clients might implement such a fixed limitation.
     1695         If the required action involves a subsequent HTTP request, it <em class="bcp14">MAY</em> be carried out by the user agent without interaction with the user if and only if the method used in the second request is
     1696         known to be "safe", as defined in <a href="#safe.methods" title="Safe Methods">Section&nbsp;6.1.1</a>.
     1697      </p>
     1698      <p id="rfc.section.7.3.p.2">There are several types of redirects: </p>
     1699      <ol>
     1700         <li>
     1701            <p>Redirects of the request to another URI, either temporarily or permanently. The new URI is specified in the Location header
     1702               field. In this specification, the status codes 301 (Moved Permanently), 302 (Found), and 307 (Temporary Redirect) fall under
     1703               this category.
     1704            </p>
     1705         </li>
     1706         <li>
     1707            <p>Redirection to a new location that represents an indirect response to the request, such as the result of a POST operation
     1708               to be retrieved with a subsequent GET request. This is status code 303 (See Other).
     1709            </p>
     1710         </li>
     1711         <li>
     1712            <p>Redirection offering a choice of matching resources for use by agent-driven content negotiation (<a href="p3-payload.html#agent-driven.negotiation" title="Agent-driven Negotiation">Section 5.2</a> of <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>). This is status code 300 (Multiple Choices).
     1713            </p>
     1714         </li>
     1715         <li>
     1716            <p>Other kinds of redirection, such as to a cached result (status code 304 (Not Modified)).</p>
     1717         </li>
     1718      </ol>
     1719      <div class="note" id="rfc.section.7.3.p.3">
     1720         <p> <b>Note:</b> In HTTP/1.0, only the status codes 301 (Moved Permanently) and 302 (Found) were defined for the first type of redirect, and
     1721            the second type did not exist at all (<a href="#RFC1945" id="rfc.xref.RFC1945.1"><cite title="Hypertext Transfer Protocol -- HTTP/1.0">[RFC1945]</cite></a>, <a href="http://tools.ietf.org/html/rfc1945#section-9.3">Section 9.3</a>). However it turned out that web forms using POST expected redirects to change the operation for the subsequent request to
     1722            retrieval (GET). To address this use case, HTTP/1.1 introduced the second type of redirect with the status code 303 (See Other)
     1723            (<a href="#RFC2068" id="rfc.xref.RFC2068.1"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2068]</cite></a>, <a href="http://tools.ietf.org/html/rfc2068#section-10.3.4">Section 10.3.4</a>). As user agents did not change their behavior to maintain backwards compatibility, the first revision of HTTP/1.1 added
     1724            yet another status code, 307 (Temporary Redirect), for which the backwards compatibility problems did not apply (<a href="#RFC2616" id="rfc.xref.RFC2616.2"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="http://tools.ietf.org/html/rfc2616#section-10.3.8">Section 10.3.8</a>). Over 10 years later, most user agents still do method rewriting for status codes 301 and 302, therefore this specification
     1725            makes that behavior compliant in case the original request was POST.
     1726         </p>
     1727      </div>
     1728      <p id="rfc.section.7.3.p.4">Clients <em class="bcp14">SHOULD</em> detect and intervene in cyclical redirections (i.e., "infinite" redirection loops).
     1729      </p>
     1730      <div class="note" id="rfc.section.7.3.p.5">
     1731         <p> <b>Note:</b> An earlier version of this specification recommended a maximum of five redirections (<a href="#RFC2068" id="rfc.xref.RFC2068.2"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2068]</cite></a>, <a href="http://tools.ietf.org/html/rfc2068#section-10.3">Section 10.3</a>). Content developers need to be aware that some clients might implement such a fixed limitation.
    17001732         </p>
    17011733      </div>
     
    17041736      <h3 id="rfc.section.7.3.1"><a href="#rfc.section.7.3.1">7.3.1</a>&nbsp;<a id="status.300" href="#status.300">300 Multiple Choices</a></h3>
    17051737      <p id="rfc.section.7.3.1.p.1">The target resource has more than one representation, each with its own specific location, and agent-driven negotiation information
    1706          (<a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 5</a> of <a href="#Part3" id="rfc.xref.Part3.7"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) is being provided so that the user (or user agent) can select a preferred representation by redirecting its request to that
     1738         (<a href="p3-payload.html#content.negotiation" title="Content Negotiation">Section 5</a> of <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) is being provided so that the user (or user agent) can select a preferred representation by redirecting its request to that
    17071739         location.
    17081740      </p>
     
    17291761      </p>
    17301762      <div class="note" id="rfc.section.7.3.2.p.5">
    1731          <p> <b>Note:</b> When automatically redirecting a POST request after receiving a 301 status code, some existing HTTP/1.0 user agents will erroneously
    1732             change it into a GET request.
     1763         <p> <b>Note:</b> For historic reasons, user agents <em class="bcp14">MAY</em> change the request method from POST to GET for the subsequent request. If this behavior is undesired, status code 307 (Temporary
     1764            Redirect) can be used instead.
    17331765         </p>
    17341766      </div>
     
    17441776      </p>
    17451777      <div class="note" id="rfc.section.7.3.3.p.4">
    1746          <p> <b>Note:</b> HTTP/1.0 (<a href="#RFC1945" id="rfc.xref.RFC1945.1"><cite title="Hypertext Transfer Protocol -- HTTP/1.0">[RFC1945]</cite></a>, <a href="http://tools.ietf.org/html/rfc1945#section-9.3">Section 9.3</a>) and the first version of HTTP/1.1 (<a href="#RFC2068" id="rfc.xref.RFC2068.2"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2068]</cite></a>, <a href="http://tools.ietf.org/html/rfc2068#section-10.3.3">Section 10.3.3</a>) specify that the client is not allowed to change the method on the redirected request. However, most existing user agent
    1747             implementations treat 302 as if it were a 303 response, performing a GET on the Location field-value regardless of the original
    1748             request method. Therefore, a previous version of this specification (<a href="#RFC2616" id="rfc.xref.RFC2616.2"><cite title="Hypertext Transfer Protocol -- HTTP/1.1">[RFC2616]</cite></a>, <a href="http://tools.ietf.org/html/rfc2616#section-10.3.3">Section 10.3.3</a>) has added the status codes <a href="#status.303" id="rfc.xref.status.303.2">303</a> and <a href="#status.307" id="rfc.xref.status.307.2">307</a> for servers that wish to make unambiguously clear which kind of reaction is expected of the client.
     1778         <p> <b>Note:</b> For historic reasons, user agents <em class="bcp14">MAY</em> change the request method from POST to GET for the subsequent request. If this behavior is undesired, status code 307 (Temporary
     1779            Redirect) can be used instead. <span class="comment" id="issue312">[<a href="#issue312" class="smpl">issue312</a>: but see &lt;<a href="http://trac.tools.ietf.org/wg/httpbis/trac/ticket/312">http://trac.tools.ietf.org/wg/httpbis/trac/ticket/312</a>&gt;]</span>
    17491780         </p>
    17501781      </div>
     
    18451876      <h3 id="rfc.section.7.4.7"><a href="#rfc.section.7.4.7">7.4.7</a>&nbsp;<a id="status.406" href="#status.406">406 Not Acceptable</a></h3>
    18461877      <p id="rfc.section.7.4.7.p.1">The resource identified by the request is only capable of generating response representations which have content characteristics
    1847          not acceptable according to the Accept and Accept-* header fields sent in the request (see <a href="p3-payload.html#header.field.definitions" title="Header Field Definitions">Section 6</a> of <a href="#Part3" id="rfc.xref.Part3.8"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
     1878         not acceptable according to the Accept and Accept-* header fields sent in the request (see <a href="p3-payload.html#header.field.definitions" title="Header Field Definitions">Section 6</a> of <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>).
    18481879      </p>
    18491880      <p id="rfc.section.7.4.7.p.2">Unless it was a HEAD request, the response <em class="bcp14">SHOULD</em> include a representation containing a list of available representation characteristics and location(s) from which the user
     
    20942125      </div>
    20952126      <div class="note" id="rfc.section.8.4.p.9">
    2096          <p> <b>Note:</b> The Content-Location header field (<a href="p3-payload.html#header.content-location" title="Content-Location">Section 6.7</a> of <a href="#Part3" id="rfc.xref.Part3.9"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) differs from Location in that the Content-Location identifies the most specific resource corresponding to the enclosed representation.
     2127         <p> <b>Note:</b> The Content-Location header field (<a href="p3-payload.html#header.content-location" title="Content-Location">Section 6.7</a> of <a href="#Part3" id="rfc.xref.Part3.10"><cite title="HTTP/1.1, part 3: Message Payload and Content Negotiation">[Part3]</cite></a>) differs from Location in that the Content-Location identifies the most specific resource corresponding to the enclosed representation.
    20972128            It is therefore possible for a response to contain header fields for both Location and Content-Location.
    20982129         </p>
     
    23392370                  <td class="left">303</td>
    23402371                  <td class="left">See Other</td>
    2341                   <td class="left"> <a href="#status.303" id="rfc.xref.status.303.3" title="303 See Other">Section&nbsp;7.3.4</a>
     2372                  <td class="left"> <a href="#status.303" id="rfc.xref.status.303.2" title="303 See Other">Section&nbsp;7.3.4</a>
    23422373                  </td>
    23432374               </tr>
     
    23572388                  <td class="left">307</td>
    23582389                  <td class="left">Temporary Redirect</td>
    2359                   <td class="left"> <a href="#status.307" id="rfc.xref.status.307.3" title="307 Temporary Redirect">Section&nbsp;7.3.8</a>
     2390                  <td class="left"> <a href="#status.307" id="rfc.xref.status.307.2" title="307 Temporary Redirect">Section&nbsp;7.3.8</a>
    23602391                  </td>
    23612392               </tr>
     
    27692800      </p>
    27702801      <p id="rfc.section.A.p.6">Failed to consider that there are many other request methods that are safe to automatically redirect, and further that the
    2771          user agent is able to make that determination based on the request method semantics. (Sections <a href="#status.301" id="rfc.xref.status.301.3" title="301 Moved Permanently">7.3.2</a>, <a href="#status.302" id="rfc.xref.status.302.3" title="302 Found">7.3.3</a> and <a href="#status.307" id="rfc.xref.status.307.4" title="307 Temporary Redirect">7.3.8</a>)
     2802         user agent is able to make that determination based on the request method semantics. Furthermore, allow user agents to rewrite
     2803         the method from POST to GET for status codes 301 and 302. (Sections <a href="#status.301" id="rfc.xref.status.301.3" title="301 Moved Permanently">7.3.2</a>, <a href="#status.302" id="rfc.xref.status.302.3" title="302 Found">7.3.3</a> and <a href="#status.307" id="rfc.xref.status.307.3" title="307 Temporary Redirect">7.3.8</a>)
    27722804      </p>
    27732805      <p id="rfc.section.A.p.7">Deprecate 305 Use Proxy status code, because user agents did not implement it. It used to indicate that the target resource
     
    31233155      <p id="rfc.section.C.18.p.1">Closed issues: </p>
    31243156      <ul>
     3157         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/160">http://tools.ietf.org/wg/httpbis/trac/ticket/160</a>&gt;: "Redirects and non-GET methods"
     3158         </li>
    31253159         <li> &lt;<a href="http://tools.ietf.org/wg/httpbis/trac/ticket/310">http://tools.ietf.org/wg/httpbis/trac/ticket/310</a>&gt;: "clarify 303 redirect on HEAD"
    31263160         </li>
     
    31553189                  <li>301 Moved Permanently (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.32"><b>7.3.2</b></a>, <a href="#rfc.xref.status.301.2">9.2</a>, <a href="#rfc.xref.status.301.3">A</a></li>
    31563190                  <li>302 Found (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.33"><b>7.3.3</b></a>, <a href="#rfc.xref.status.302.2">9.2</a>, <a href="#rfc.xref.status.302.3">A</a></li>
    3157                   <li>303 See Other (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.xref.status.303.2">7.3.3</a>, <a href="#rfc.iref.34"><b>7.3.4</b></a>, <a href="#rfc.xref.status.303.3">9.2</a></li>
     3191                  <li>303 See Other (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.34"><b>7.3.4</b></a>, <a href="#rfc.xref.status.303.2">9.2</a></li>
    31583192                  <li>304 Not Modified (status code)&nbsp;&nbsp;<a href="#rfc.iref.35"><b>7.3.5</b></a></li>
    31593193                  <li>305 Use Proxy (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.36"><b>7.3.6</b></a>, <a href="#rfc.xref.status.305.2">9.2</a>, <a href="#rfc.xref.status.305.3">A</a></li>
    31603194                  <li>306 (Unused) (status code)&nbsp;&nbsp;<a href="#rfc.iref.37"><b>7.3.7</b></a>, <a href="#rfc.xref.status.306.1">9.2</a></li>
    3161                   <li>307 Temporary Redirect (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.xref.status.307.2">7.3.3</a>, <a href="#rfc.iref.38"><b>7.3.8</b></a>, <a href="#rfc.xref.status.307.3">9.2</a>, <a href="#rfc.xref.status.307.4">A</a></li>
     3195                  <li>307 Temporary Redirect (status code)&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.38"><b>7.3.8</b></a>, <a href="#rfc.xref.status.307.2">9.2</a>, <a href="#rfc.xref.status.307.3">A</a></li>
    31623196               </ul>
    31633197            </li>
     
    33093343                     </ul>
    33103344                  </li>
    3311                   <li><em>Part3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.1">3.2</a>, <a href="#rfc.xref.Part3.2">3.2</a>, <a href="#rfc.xref.Part3.3">3.2</a>, <a href="#rfc.xref.Part3.4">3.2</a>, <a href="#rfc.xref.Part3.5">5</a>, <a href="#rfc.xref.Part3.6">6.5</a>, <a href="#rfc.xref.Part3.7">7.3.1</a>, <a href="#rfc.xref.Part3.8">7.4.7</a>, <a href="#rfc.xref.Part3.9">8.4</a>, <a href="#Part3"><b>12.1</b></a><ul>
    3312                         <li><em>Section 5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.7">7.3.1</a></li>
     3345                  <li><em>Part3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.1">3.2</a>, <a href="#rfc.xref.Part3.2">3.2</a>, <a href="#rfc.xref.Part3.3">3.2</a>, <a href="#rfc.xref.Part3.4">3.2</a>, <a href="#rfc.xref.Part3.5">5</a>, <a href="#rfc.xref.Part3.6">6.5</a>, <a href="#rfc.xref.Part3.7">7.3</a>, <a href="#rfc.xref.Part3.8">7.3.1</a>, <a href="#rfc.xref.Part3.9">7.4.7</a>, <a href="#rfc.xref.Part3.10">8.4</a>, <a href="#Part3"><b>12.1</b></a><ul>
     3346                        <li><em>Section 5</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.8">7.3.1</a></li>
     3347                        <li><em>Section 5.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.7">7.3</a></li>
    33133348                        <li><em>Section 6.1</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.1">3.2</a></li>
    3314                         <li><em>Section 6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.8">7.4.7</a></li>
     3349                        <li><em>Section 6</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.9">7.4.7</a></li>
    33153350                        <li><em>Section 6.2</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.2">3.2</a></li>
    33163351                        <li><em>Section 6.3</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.3">3.2</a></li>
    33173352                        <li><em>Section 6.4</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.4">3.2</a></li>
    3318                         <li><em>Section 6.7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.6">6.5</a>, <a href="#rfc.xref.Part3.9">8.4</a></li>
     3353                        <li><em>Section 6.7</em>&nbsp;&nbsp;<a href="#rfc.xref.Part3.6">6.5</a>, <a href="#rfc.xref.Part3.10">8.4</a></li>
    33193354                     </ul>
    33203355                  </li>
     
    33663401                  <li>Referer header field&nbsp;&nbsp;<a href="#rfc.xref.header.referer.1">3.2</a>, <a href="#rfc.iref.r.1"><b>8.6</b></a>, <a href="#rfc.xref.header.referer.2">9.3</a>, <a href="#rfc.xref.header.referer.3">A</a></li>
    33673402                  <li>Retry-After header field&nbsp;&nbsp;<a href="#rfc.xref.header.retry-after.1">3.3</a>, <a href="#rfc.xref.header.retry-after.2">7.5.4</a>, <a href="#rfc.iref.r.2"><b>8.7</b></a>, <a href="#rfc.xref.header.retry-after.3">9.3</a></li>
    3368                   <li><em>RFC1945</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">7.3.3</a>, <a href="#RFC1945"><b>12.2</b></a><ul>
    3369                         <li><em>Section 9.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">7.3.3</a></li>
     3403                  <li><em>RFC1945</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">7.3</a>, <a href="#RFC1945"><b>12.2</b></a><ul>
     3404                        <li><em>Section 9.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC1945.1">7.3</a></li>
    33703405                     </ul>
    33713406                  </li>
    3372                   <li><em>RFC2068</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">7.3</a>, <a href="#rfc.xref.RFC2068.2">7.3.3</a>, <a href="#RFC2068"><b>12.2</b></a><ul>
    3373                         <li><em>Section 10.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">7.3</a></li>
    3374                         <li><em>Section 10.3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.2">7.3.3</a></li>
     3407                  <li><em>RFC2068</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">7.3</a>, <a href="#rfc.xref.RFC2068.2">7.3</a>, <a href="#RFC2068"><b>12.2</b></a><ul>
     3408                        <li><em>Section 10.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.2">7.3</a></li>
     3409                        <li><em>Section 10.3.4</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2068.1">7.3</a></li>
    33753410                     </ul>
    33763411                  </li>
    33773412                  <li><em>RFC2119</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2119.1">1.1</a>, <a href="#RFC2119"><b>12.1</b></a></li>
    3378                   <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">1</a>, <a href="#rfc.xref.RFC2616.2">7.3.3</a>, <a href="#RFC2616"><b>12.2</b></a>, <a href="#rfc.xref.RFC2616.3">C.1</a><ul>
    3379                         <li><em>Section 10.3.3</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.2">7.3.3</a></li>
     3413                  <li><em>RFC2616</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.1">1</a>, <a href="#rfc.xref.RFC2616.2">7.3</a>, <a href="#RFC2616"><b>12.2</b></a>, <a href="#rfc.xref.RFC2616.3">C.1</a><ul>
     3414                        <li><em>Section 10.3.8</em>&nbsp;&nbsp;<a href="#rfc.xref.RFC2616.2">7.3</a></li>
    33803415                     </ul>
    33813416                  </li>
     
    34263461                        <li>301 Moved Permanently&nbsp;&nbsp;<a href="#rfc.xref.status.301.1">4.1</a>, <a href="#rfc.iref.s.12"><b>7.3.2</b></a>, <a href="#rfc.xref.status.301.2">9.2</a>, <a href="#rfc.xref.status.301.3">A</a></li>
    34273462                        <li>302 Found&nbsp;&nbsp;<a href="#rfc.xref.status.302.1">4.1</a>, <a href="#rfc.iref.s.13"><b>7.3.3</b></a>, <a href="#rfc.xref.status.302.2">9.2</a>, <a href="#rfc.xref.status.302.3">A</a></li>
    3428                         <li>303 See Other&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.xref.status.303.2">7.3.3</a>, <a href="#rfc.iref.s.14"><b>7.3.4</b></a>, <a href="#rfc.xref.status.303.3">9.2</a></li>
     3463                        <li>303 See Other&nbsp;&nbsp;<a href="#rfc.xref.status.303.1">4.1</a>, <a href="#rfc.iref.s.14"><b>7.3.4</b></a>, <a href="#rfc.xref.status.303.2">9.2</a></li>
    34293464                        <li>304 Not Modified&nbsp;&nbsp;<a href="#rfc.iref.s.15"><b>7.3.5</b></a></li>
    34303465                        <li>305 Use Proxy&nbsp;&nbsp;<a href="#rfc.xref.status.305.1">4.1</a>, <a href="#rfc.iref.s.16"><b>7.3.6</b></a>, <a href="#rfc.xref.status.305.2">9.2</a>, <a href="#rfc.xref.status.305.3">A</a></li>
    34313466                        <li>306 (Unused)&nbsp;&nbsp;<a href="#rfc.iref.s.17"><b>7.3.7</b></a>, <a href="#rfc.xref.status.306.1">9.2</a></li>
    3432                         <li>307 Temporary Redirect&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.xref.status.307.2">7.3.3</a>, <a href="#rfc.iref.s.18"><b>7.3.8</b></a>, <a href="#rfc.xref.status.307.3">9.2</a>, <a href="#rfc.xref.status.307.4">A</a></li>
     3467                        <li>307 Temporary Redirect&nbsp;&nbsp;<a href="#rfc.xref.status.307.1">4.1</a>, <a href="#rfc.iref.s.18"><b>7.3.8</b></a>, <a href="#rfc.xref.status.307.2">9.2</a>, <a href="#rfc.xref.status.307.3">A</a></li>
    34333468                        <li>400 Bad Request&nbsp;&nbsp;<a href="#rfc.xref.status.400.1">4.1</a>, <a href="#rfc.iref.s.19"><b>7.4.1</b></a>, <a href="#rfc.xref.status.400.2">9.2</a></li>
    34343469                        <li>401 Unauthorized&nbsp;&nbsp;<a href="#rfc.iref.s.20"><b>7.4.2</b></a></li>
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