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  <div class="section" id="module-CGIHTTPServer">
<span id="cgihttpserver-cgi-capable-http-request-handler"></span><h1>20.20. <a class="reference internal" href="#module-CGIHTTPServer" title="CGIHTTPServer: This module provides a request handler for HTTP servers which can run CGI scripts."><code class="xref py py-mod docutils literal notranslate"><span class="pre">CGIHTTPServer</span></code></a> — CGI-capable HTTP request handler<a class="headerlink" href="#module-CGIHTTPServer" title="Permalink to this headline">¶</a></h1>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>The <a class="reference internal" href="#module-CGIHTTPServer" title="CGIHTTPServer: This module provides a request handler for HTTP servers which can run CGI scripts."><code class="xref py py-mod docutils literal notranslate"><span class="pre">CGIHTTPServer</span></code></a> module has been merged into <code class="xref py py-mod docutils literal notranslate"><span class="pre">http.server</span></code> in
Python 3.  The <a class="reference internal" href="../glossary.html#term-2to3"><span class="xref std std-term">2to3</span></a> tool will automatically adapt imports when
converting your sources to Python 3.</p>
</div>
<p>The <a class="reference internal" href="#module-CGIHTTPServer" title="CGIHTTPServer: This module provides a request handler for HTTP servers which can run CGI scripts."><code class="xref py py-mod docutils literal notranslate"><span class="pre">CGIHTTPServer</span></code></a> module defines a request-handler class, interface
compatible with <a class="reference internal" href="basehttpserver.html#BaseHTTPServer.BaseHTTPRequestHandler" title="BaseHTTPServer.BaseHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">BaseHTTPServer.BaseHTTPRequestHandler</span></code></a> and inherits
behavior from <a class="reference internal" href="simplehttpserver.html#SimpleHTTPServer.SimpleHTTPRequestHandler" title="SimpleHTTPServer.SimpleHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">SimpleHTTPServer.SimpleHTTPRequestHandler</span></code></a> but can also
run CGI scripts.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>This module can run CGI scripts on Unix and Windows systems.</p>
</div>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>CGI scripts run by the <a class="reference internal" href="#CGIHTTPServer.CGIHTTPRequestHandler" title="CGIHTTPServer.CGIHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">CGIHTTPRequestHandler</span></code></a> class cannot execute
redirects (HTTP code 302), because code 200 (script output follows) is sent
prior to execution of the CGI script.  This pre-empts the status code.</p>
</div>
<p>The <a class="reference internal" href="#module-CGIHTTPServer" title="CGIHTTPServer: This module provides a request handler for HTTP servers which can run CGI scripts."><code class="xref py py-mod docutils literal notranslate"><span class="pre">CGIHTTPServer</span></code></a> module defines the following class:</p>
<dl class="class">
<dt id="CGIHTTPServer.CGIHTTPRequestHandler">
<em class="property">class </em><code class="descclassname">CGIHTTPServer.</code><code class="descname">CGIHTTPRequestHandler</code><span class="sig-paren">(</span><em>request</em>, <em>client_address</em>, <em>server</em><span class="sig-paren">)</span><a class="headerlink" href="#CGIHTTPServer.CGIHTTPRequestHandler" title="Permalink to this definition">¶</a></dt>
<dd><p>This class is used to serve either files or output of CGI scripts from  the
current directory and below. Note that mapping HTTP hierarchic structure to
local directory structure is exactly as in
<a class="reference internal" href="simplehttpserver.html#SimpleHTTPServer.SimpleHTTPRequestHandler" title="SimpleHTTPServer.SimpleHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">SimpleHTTPServer.SimpleHTTPRequestHandler</span></code></a>.</p>
<p>The class will however, run the CGI script, instead of serving it as a file, if
it guesses it to be a CGI script. Only directory-based CGI are used — the
other common server configuration is to treat special extensions as denoting CGI
scripts.</p>
<p>The <code class="xref py py-func docutils literal notranslate"><span class="pre">do_GET()</span></code> and <code class="xref py py-func docutils literal notranslate"><span class="pre">do_HEAD()</span></code> functions are modified to run CGI scripts
and serve the output, instead of serving files, if the request leads to
somewhere below the <code class="docutils literal notranslate"><span class="pre">cgi_directories</span></code> path.</p>
<p>The <a class="reference internal" href="#CGIHTTPServer.CGIHTTPRequestHandler" title="CGIHTTPServer.CGIHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">CGIHTTPRequestHandler</span></code></a> defines the following data member:</p>
<dl class="attribute">
<dt id="CGIHTTPServer.CGIHTTPRequestHandler.cgi_directories">
<code class="descname">cgi_directories</code><a class="headerlink" href="#CGIHTTPServer.CGIHTTPRequestHandler.cgi_directories" title="Permalink to this definition">¶</a></dt>
<dd><p>This defaults to <code class="docutils literal notranslate"><span class="pre">['/cgi-bin',</span> <span class="pre">'/htbin']</span></code> and describes directories to
treat as containing CGI scripts.</p>
</dd></dl>

<p>The <a class="reference internal" href="#CGIHTTPServer.CGIHTTPRequestHandler" title="CGIHTTPServer.CGIHTTPRequestHandler"><code class="xref py py-class docutils literal notranslate"><span class="pre">CGIHTTPRequestHandler</span></code></a> defines the following methods:</p>
<dl class="method">
<dt id="CGIHTTPServer.CGIHTTPRequestHandler.do_POST">
<code class="descname">do_POST</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CGIHTTPServer.CGIHTTPRequestHandler.do_POST" title="Permalink to this definition">¶</a></dt>
<dd><p>This method serves the <code class="docutils literal notranslate"><span class="pre">'POST'</span></code> request type, only allowed for CGI
scripts.  Error 501, “Can only POST to CGI scripts”, is output when trying
to POST to a non-CGI url.</p>
</dd></dl>

</dd></dl>

<p>Note that CGI scripts will be run with UID of user nobody, for security reasons.
Problems with the CGI script will be translated to error 403.</p>
<p>For example usage, see the implementation of the <a class="reference internal" href="test.html#module-test" title="test: Regression tests package containing the testing suite for Python."><code class="xref py py-func docutils literal notranslate"><span class="pre">test()</span></code></a> function.</p>
<div class="admonition seealso">
<p class="admonition-title">See also</p>
<dl class="simple">
<dt>Module <a class="reference internal" href="basehttpserver.html#module-BaseHTTPServer" title="BaseHTTPServer: Basic HTTP server (base class for SimpleHTTPServer and CGIHTTPServer)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">BaseHTTPServer</span></code></a></dt><dd><p>Base class implementation for Web server and request handler.</p>
</dd>
</dl>
</div>
</div>


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