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<div class="section" id="module-http">
<span id="http-http-modules"></span><h1>21.11. <a class="reference internal" href="#module-http" title="http: HTTP status codes and messages"><code class="xref py py-mod docutils literal"><span class="pre">http</span></code></a> — HTTP modules<a class="headerlink" href="#module-http" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://hg.python.org/cpython/file/3.5/Lib/http/__init__.py">Lib/http/__init__.py</a></p>
<hr class="docutils" id="index-0" />
<p><a class="reference internal" href="#module-http" title="http: HTTP status codes and messages"><code class="xref py py-mod docutils literal"><span class="pre">http</span></code></a> is a package that collects several modules for working with the
HyperText Transfer Protocol:</p>
<ul class="simple">
<li><a class="reference internal" href="http.client.html#module-http.client" title="http.client: HTTP and HTTPS protocol client (requires sockets)."><code class="xref py py-mod docutils literal"><span class="pre">http.client</span></code></a> is a low-level HTTP protocol client; for high-level URL
opening use <a class="reference internal" href="urllib.request.html#module-urllib.request" title="urllib.request: Extensible library for opening URLs."><code class="xref py py-mod docutils literal"><span class="pre">urllib.request</span></code></a></li>
<li><a class="reference internal" href="http.server.html#module-http.server" title="http.server: HTTP server and request handlers."><code class="xref py py-mod docutils literal"><span class="pre">http.server</span></code></a> contains basic HTTP server classes based on <a class="reference internal" href="socketserver.html#module-socketserver" title="socketserver: A framework for network servers."><code class="xref py py-mod docutils literal"><span class="pre">socketserver</span></code></a></li>
<li><a class="reference internal" href="http.cookies.html#module-http.cookies" title="http.cookies: Support for HTTP state management (cookies)."><code class="xref py py-mod docutils literal"><span class="pre">http.cookies</span></code></a> has utilities for implementing state management with cookies</li>
<li><a class="reference internal" href="http.cookiejar.html#module-http.cookiejar" title="http.cookiejar: Classes for automatic handling of HTTP cookies."><code class="xref py py-mod docutils literal"><span class="pre">http.cookiejar</span></code></a> provides persistence of cookies</li>
</ul>
<p><a class="reference internal" href="#module-http" title="http: HTTP status codes and messages"><code class="xref py py-mod docutils literal"><span class="pre">http</span></code></a> is also a module that defines a number of HTTP status codes and
associated messages through the <a class="reference internal" href="#http.HTTPStatus" title="http.HTTPStatus"><code class="xref py py-class docutils literal"><span class="pre">http.HTTPStatus</span></code></a> enum:</p>
<dl class="class">
<dt id="http.HTTPStatus">
<em class="property">class </em><code class="descclassname">http.</code><code class="descname">HTTPStatus</code><a class="headerlink" href="#http.HTTPStatus" title="Permalink to this definition">¶</a></dt>
<dd><div class="versionadded">
<p><span class="versionmodified">New in version 3.5.</span></p>
</div>
<p>A subclass of <a class="reference internal" href="enum.html#enum.IntEnum" title="enum.IntEnum"><code class="xref py py-class docutils literal"><span class="pre">enum.IntEnum</span></code></a> that defines a set of HTTP status codes,
reason phrases and long descriptions written in English.</p>
<p>Usage:</p>
<div class="highlight-python3"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">from</span> <span class="nn">http</span> <span class="k">import</span> <span class="n">HTTPStatus</span>
<span class="gp">>>> </span><span class="n">HTTPStatus</span><span class="o">.</span><span class="n">OK</span>
<span class="go"><HTTPStatus.OK: 200></span>
<span class="gp">>>> </span><span class="n">HTTPStatus</span><span class="o">.</span><span class="n">OK</span> <span class="o">==</span> <span class="mi">200</span>
<span class="go">True</span>
<span class="gp">>>> </span><span class="n">http</span><span class="o">.</span><span class="n">HTTPStatus</span><span class="o">.</span><span class="n">OK</span><span class="o">.</span><span class="n">value</span>
<span class="go">200</span>
<span class="gp">>>> </span><span class="n">HTTPStatus</span><span class="o">.</span><span class="n">OK</span><span class="o">.</span><span class="n">phrase</span>
<span class="go">'OK'</span>
<span class="gp">>>> </span><span class="n">HTTPStatus</span><span class="o">.</span><span class="n">OK</span><span class="o">.</span><span class="n">description</span>
<span class="go">'Request fulfilled, document follows'</span>
<span class="gp">>>> </span><span class="nb">list</span><span class="p">(</span><span class="n">HTTPStatus</span><span class="p">)</span>
<span class="go">[<HTTPStatus.CONTINUE: 100>, <HTTPStatus.SWITCHING_PROTOCOLS: 101>, ...]</span>
</pre></div>
</div>
</dd></dl>
<div class="section" id="http-status-codes">
<span id="id1"></span><h2>21.11.1. HTTP status codes<a class="headerlink" href="#http-status-codes" title="Permalink to this headline">¶</a></h2>
<p>Supported,
<a class="reference external" href="https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml">IANA-registered</a>
status codes available in <a class="reference internal" href="#http.HTTPStatus" title="http.HTTPStatus"><code class="xref py py-class docutils literal"><span class="pre">http.HTTPStatus</span></code></a> are:</p>
<table border="1" class="docutils">
<colgroup>
<col width="6%" />
<col width="29%" />
<col width="65%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Code</th>
<th class="head">Enum Name</th>
<th class="head">Details</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td><code class="docutils literal"><span class="pre">100</span></code></td>
<td><code class="docutils literal"><span class="pre">CONTINUE</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-1"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.2.1</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">101</span></code></td>
<td><code class="docutils literal"><span class="pre">SWITCHING_PROTOCOLS</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-2"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.2.2</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">102</span></code></td>
<td><code class="docutils literal"><span class="pre">PROCESSING</span></code></td>
<td>WebDAV <span class="target" id="index-3"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2518.html"><strong>RFC 2518</strong></a>, Section 10.1</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">200</span></code></td>
<td><code class="docutils literal"><span class="pre">OK</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-4"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.3.1</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">201</span></code></td>
<td><code class="docutils literal"><span class="pre">CREATED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-5"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.3.2</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">202</span></code></td>
<td><code class="docutils literal"><span class="pre">ACCEPTED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-6"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.3.3</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">203</span></code></td>
<td><code class="docutils literal"><span class="pre">NON_AUTHORITATIVE_INFORMATION</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-7"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.3.4</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">204</span></code></td>
<td><code class="docutils literal"><span class="pre">NO_CONTENT</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-8"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.3.5</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">205</span></code></td>
<td><code class="docutils literal"><span class="pre">RESET_CONTENT</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-9"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.3.6</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">206</span></code></td>
<td><code class="docutils literal"><span class="pre">PARTIAL_CONTENT</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-10"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7233.html"><strong>RFC 7233</strong></a>, Section 4.1</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">207</span></code></td>
<td><code class="docutils literal"><span class="pre">MULTI_STATUS</span></code></td>
<td>WebDAV <span class="target" id="index-11"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc4918.html"><strong>RFC 4918</strong></a>, Section 11.1</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">208</span></code></td>
<td><code class="docutils literal"><span class="pre">ALREADY_REPORTED</span></code></td>
<td>WebDAV Binding Extensions <span class="target" id="index-12"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc5842.html"><strong>RFC 5842</strong></a>, Section 7.1 (Experimental)</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">226</span></code></td>
<td><code class="docutils literal"><span class="pre">IM_USED</span></code></td>
<td>Delta Encoding in HTTP <span class="target" id="index-13"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc3229.html"><strong>RFC 3229</strong></a>, Section 10.4.1</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">300</span></code></td>
<td><code class="docutils literal"><span class="pre">MULTIPLE_CHOICES</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-14"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.4.1</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">301</span></code></td>
<td><code class="docutils literal"><span class="pre">MOVED_PERMANENTLY</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-15"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.4.2</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">302</span></code></td>
<td><code class="docutils literal"><span class="pre">FOUND</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-16"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.4.3</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">303</span></code></td>
<td><code class="docutils literal"><span class="pre">SEE_OTHER</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-17"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.4.4</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">304</span></code></td>
<td><code class="docutils literal"><span class="pre">NOT_MODIFIED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-18"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7232.html"><strong>RFC 7232</strong></a>, Section 4.1</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">305</span></code></td>
<td><code class="docutils literal"><span class="pre">USE_PROXY</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-19"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.4.5</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">307</span></code></td>
<td><code class="docutils literal"><span class="pre">TEMPORARY_REDIRECT</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-20"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.4.7</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">308</span></code></td>
<td><code class="docutils literal"><span class="pre">PERMANENT_REDIRECT</span></code></td>
<td>Permanent Redirect <span class="target" id="index-21"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7238.html"><strong>RFC 7238</strong></a>, Section 3 (Experimental)</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">400</span></code></td>
<td><code class="docutils literal"><span class="pre">BAD_REQUEST</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-22"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.1</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">401</span></code></td>
<td><code class="docutils literal"><span class="pre">UNAUTHORIZED</span></code></td>
<td>HTTP/1.1 Authentication <span class="target" id="index-23"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7235.html"><strong>RFC 7235</strong></a>, Section 3.1</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">402</span></code></td>
<td><code class="docutils literal"><span class="pre">PAYMENT_REQUIRED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-24"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.2</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">403</span></code></td>
<td><code class="docutils literal"><span class="pre">FORBIDDEN</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-25"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.3</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">404</span></code></td>
<td><code class="docutils literal"><span class="pre">NOT_FOUND</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-26"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.4</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">405</span></code></td>
<td><code class="docutils literal"><span class="pre">METHOD_NOT_ALLOWED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-27"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.5</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">406</span></code></td>
<td><code class="docutils literal"><span class="pre">NOT_ACCEPTABLE</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-28"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.6</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">407</span></code></td>
<td><code class="docutils literal"><span class="pre">PROXY_AUTHENTICATION_REQUIRED</span></code></td>
<td>HTTP/1.1 Authentication <span class="target" id="index-29"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7235.html"><strong>RFC 7235</strong></a>, Section 3.2</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">408</span></code></td>
<td><code class="docutils literal"><span class="pre">REQUEST_TIMEOUT</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-30"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.7</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">409</span></code></td>
<td><code class="docutils literal"><span class="pre">CONFLICT</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-31"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.8</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">410</span></code></td>
<td><code class="docutils literal"><span class="pre">GONE</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-32"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.9</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">411</span></code></td>
<td><code class="docutils literal"><span class="pre">LENGTH_REQUIRED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-33"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.10</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">412</span></code></td>
<td><code class="docutils literal"><span class="pre">PRECONDITION_FAILED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-34"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7232.html"><strong>RFC 7232</strong></a>, Section 4.2</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">413</span></code></td>
<td><code class="docutils literal"><span class="pre">REQUEST_ENTITY_TOO_LARGE</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-35"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.11</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">414</span></code></td>
<td><code class="docutils literal"><span class="pre">REQUEST_URI_TOO_LONG</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-36"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.12</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">415</span></code></td>
<td><code class="docutils literal"><span class="pre">UNSUPPORTED_MEDIA_TYPE</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-37"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.13</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">416</span></code></td>
<td><code class="docutils literal"><span class="pre">REQUEST_RANGE_NOT_SATISFIABLE</span></code></td>
<td>HTTP/1.1 Range Requests <span class="target" id="index-38"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7233.html"><strong>RFC 7233</strong></a>, Section 4.4</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">417</span></code></td>
<td><code class="docutils literal"><span class="pre">EXPECTATION_FAILED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-39"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.14</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">422</span></code></td>
<td><code class="docutils literal"><span class="pre">UNPROCESSABLE_ENTITY</span></code></td>
<td>WebDAV <span class="target" id="index-40"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc4918.html"><strong>RFC 4918</strong></a>, Section 11.2</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">423</span></code></td>
<td><code class="docutils literal"><span class="pre">LOCKED</span></code></td>
<td>WebDAV <span class="target" id="index-41"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc4918.html"><strong>RFC 4918</strong></a>, Section 11.3</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">424</span></code></td>
<td><code class="docutils literal"><span class="pre">FAILED_DEPENDENCY</span></code></td>
<td>WebDAV <span class="target" id="index-42"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc4918.html"><strong>RFC 4918</strong></a>, Section 11.4</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">426</span></code></td>
<td><code class="docutils literal"><span class="pre">UPGRADE_REQUIRED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-43"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.5.15</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">428</span></code></td>
<td><code class="docutils literal"><span class="pre">PRECONDITION_REQUIRED</span></code></td>
<td>Additional HTTP Status Codes <span class="target" id="index-44"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc6585.html"><strong>RFC 6585</strong></a></td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">429</span></code></td>
<td><code class="docutils literal"><span class="pre">TOO_MANY_REQUESTS</span></code></td>
<td>Additional HTTP Status Codes <span class="target" id="index-45"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc6585.html"><strong>RFC 6585</strong></a></td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">431</span></code></td>
<td><code class="docutils literal"><span class="pre">REQUEST_HEADER_FIELDS_TOO_LARGE</span></code></td>
<td>Additional HTTP Status Codes <span class="target" id="index-46"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc6585.html"><strong>RFC 6585</strong></a></td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">500</span></code></td>
<td><code class="docutils literal"><span class="pre">INTERNAL_SERVER_ERROR</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-47"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.6.1</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">501</span></code></td>
<td><code class="docutils literal"><span class="pre">NOT_IMPLEMENTED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-48"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.6.2</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">502</span></code></td>
<td><code class="docutils literal"><span class="pre">BAD_GATEWAY</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-49"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.6.3</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">503</span></code></td>
<td><code class="docutils literal"><span class="pre">SERVICE_UNAVAILABLE</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-50"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.6.4</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">504</span></code></td>
<td><code class="docutils literal"><span class="pre">GATEWAY_TIMEOUT</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-51"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.6.5</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">505</span></code></td>
<td><code class="docutils literal"><span class="pre">HTTP_VERSION_NOT_SUPPORTED</span></code></td>
<td>HTTP/1.1 <span class="target" id="index-52"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc7231.html"><strong>RFC 7231</strong></a>, Section 6.6.6</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">506</span></code></td>
<td><code class="docutils literal"><span class="pre">VARIANT_ALSO_NEGOTIATES</span></code></td>
<td>Transparent Content Negotiation in HTTP <span class="target" id="index-53"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2295.html"><strong>RFC 2295</strong></a>, Section 8.1 (Experimental)</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">507</span></code></td>
<td><code class="docutils literal"><span class="pre">INSUFFICIENT_STORAGE</span></code></td>
<td>WebDAV <span class="target" id="index-54"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc4918.html"><strong>RFC 4918</strong></a>, Section 11.5</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">508</span></code></td>
<td><code class="docutils literal"><span class="pre">LOOP_DETECTED</span></code></td>
<td>WebDAV Binding Extensions <span class="target" id="index-55"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc5842.html"><strong>RFC 5842</strong></a>, Section 7.2 (Experimental)</td>
</tr>
<tr class="row-odd"><td><code class="docutils literal"><span class="pre">510</span></code></td>
<td><code class="docutils literal"><span class="pre">NOT_EXTENDED</span></code></td>
<td>An HTTP Extension Framework <span class="target" id="index-56"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc2774.html"><strong>RFC 2774</strong></a>, Section 7 (Experimental)</td>
</tr>
<tr class="row-even"><td><code class="docutils literal"><span class="pre">511</span></code></td>
<td><code class="docutils literal"><span class="pre">NETWORK_AUTHENTICATION_REQUIRED</span></code></td>
<td>Additional HTTP Status Codes <span class="target" id="index-57"></span><a class="rfc reference external" href="https://tools.ietf.org/html/rfc6585.html"><strong>RFC 6585</strong></a>, Section 6</td>
</tr>
</tbody>
</table>
<p>In order to preserve backwards compatibility, enum values are also present
in the <a class="reference internal" href="http.client.html#module-http.client" title="http.client: HTTP and HTTPS protocol client (requires sockets)."><code class="xref py py-mod docutils literal"><span class="pre">http.client</span></code></a> module in the form of constants. The enum name is
equal to the constant name (i.e. <code class="docutils literal"><span class="pre">http.HTTPStatus.OK</span></code> is also available as
<code class="docutils literal"><span class="pre">http.client.OK</span></code>).</p>
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<li><a class="reference internal" href="#">21.11. <code class="docutils literal"><span class="pre">http</span></code> — HTTP modules</a><ul>
<li><a class="reference internal" href="#http-status-codes">21.11.1. HTTP status codes</a></li>
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