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+<title>Apache's Handler Use - Apache HTTP Server</title>
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+<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
+<p class="apache">Apache HTTP Server Version 2.0</p>
+<img alt="" src="./images/feather.gif" /></div>
+<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
+<div id="path">
+<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.0</a></div><div id="page-content"><div id="preamble"><h1>Apache's Handler Use</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="./en/handler.html" title="English"> en </a> |
+<a href="./es/handler.html" hreflang="es" rel="alternate" title="Español"> es </a> |
+<a href="./fr/handler.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
+<a href="./ja/handler.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
+<a href="./ko/handler.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
+<a href="./ru/handler.html" hreflang="ru" rel="alternate" title="Russian"> ru </a> |
+<a href="./tr/handler.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
+</div>
+
+ <p>This document describes the use of Apache's Handlers.</p>
+ </div>
+<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#definition">What is a Handler</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#examples">Examples</a></li>
+<li><img alt="" src="./images/down.gif" /> <a href="#programmer">Programmer's Note</a></li>
+</ul></div>
+<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="definition" id="definition">What is a Handler</a></h2>
+
+ <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_actions.html">mod_actions</a></code></li><li><code class="module"><a href="./mod/mod_asis.html">mod_asis</a></code></li><li><code class="module"><a href="./mod/mod_cgi.html">mod_cgi</a></code></li><li><code class="module"><a href="./mod/mod_imap.html">mod_imap</a></code></li><li><code class="module"><a href="./mod/mod_info.html">mod_info</a></code></li><li><code class="module"><a href="./mod/mod_mime.html">mod_mime</a></code></li><li><code class="module"><a href="./mod/mod_negotiation.html">mod_negotiation</a></code></li><li><code class="module"><a href="./mod/mod_status.html">mod_status</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/mod_actions.html#action">Action</a></code></li><li><code class="directive"><a href="./mod/mod_mime.html#addhandler">AddHandler</a></code></li><li><code class="directive"><a href="./mod/mod_mime.html#removehandler">RemoveHandler</a></code></li><li><code class="directive"><a href="./mod/core.html#sethandler">SetHandler</a></code></li></ul></td></tr></table>
+
+
+ <p>A "handler" is an internal Apache representation of the
+ action to be performed when a file is called. Generally, files
+ have implicit handlers, based on the file type. Normally, all
+ files are simply served by the server, but certain file types
+ are "handled" separately.</p>
+
+ <p>Apache 1.1 adds the ability to use handlers explicitly.
+ Based on either filename extensions or on location, handlers
+ can be specified without relation to file type. This is
+ advantageous both because it is a more elegant solution, and
+ because it also allows for both a type <strong>and</strong> a
+ handler to be associated with a file. (See also <a href="mod/mod_mime.html#multipleext">Files with Multiple
+ Extensions</a>.)</p>
+
+ <p>Handlers can either be built into the server or included in
+ a module, or they can be added with the <code class="directive"><a href="./mod/mod_actions.html#action">Action</a></code> directive. The
+ built-in handlers in the standard distribution are as
+ follows:</p>
+
+ <ul>
+ <li><strong>default-handler</strong>: Send the file using the
+ <code>default_handler()</code>, which is the handler used by
+ default to handle static content. (core)</li>
+
+ <li><strong>send-as-is</strong>: Send file with HTTP headers
+ as is. (<code class="module"><a href="./mod/mod_asis.html">mod_asis</a></code>)</li>
+
+ <li><strong>cgi-script</strong>: Treat the file as a CGI
+ script. (<code class="module"><a href="./mod/mod_cgi.html">mod_cgi</a></code>)</li>
+
+ <li><strong>imap-file</strong>: Parse as an imagemap rule
+ file. (<code class="module"><a href="./mod/mod_imap.html">mod_imap</a></code>)</li>
+
+ <li><strong>server-info</strong>: Get the server's
+ configuration information. (<code class="module"><a href="./mod/mod_info.html">mod_info</a></code>)</li>
+
+ <li><strong>server-status</strong>: Get the server's status
+ report. (<code class="module"><a href="./mod/mod_status.html">mod_status</a></code>)</li>
+
+ <li><strong>type-map</strong>: Parse as a type map file for
+ content negotiation. (<code class="module"><a href="./mod/mod_negotiation.html">mod_negotiation</a></code>)</li>
+ </ul>
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="examples" id="examples">Examples</a></h2>
+
+
+ <h3><a name="example1" id="example1">Modifying static content using a CGI script</a></h3>
+
+
+ <p>The following directives will cause requests for files with
+ the <code>html</code> extension to trigger the launch of the
+ <code>footer.pl</code> CGI script.</p>
+
+ <div class="example"><p><code>
+ Action add-footer /cgi-bin/footer.pl<br />
+ AddHandler add-footer .html
+ </code></p></div>
+
+ <p>Then the CGI script is responsible for sending the
+ originally requested document (pointed to by the
+ <code>PATH_TRANSLATED</code> environment variable) and making
+ whatever modifications or additions are desired.</p>
+
+
+ <h3><a name="example2" id="example2">Files with HTTP headers</a></h3>
+
+
+ <p>The following directives will enable the
+ <code>send-as-is</code> handler, which is used for files which
+ contain their own HTTP headers. All files in the
+ <code>/web/htdocs/asis/</code> directory will be processed by
+ the <code>send-as-is</code> handler, regardless of their
+ filename extensions.</p>
+
+ <div class="example"><p><code>
+ <Directory /web/htdocs/asis><br />
+ SetHandler send-as-is<br />
+ </Directory>
+ </code></p></div>
+
+
+ </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="programmer" id="programmer">Programmer's Note</a></h2>
+
+
+ <p>In order to implement the handler features, an addition has
+ been made to the <a href="developer/API.html">Apache API</a> that
+ you may wish to make use of. Specifically, a new record has
+ been added to the <code>request_rec</code> structure:</p>
+
+ <div class="example"><p><code>
+ char *handler
+ </code></p></div>
+
+ <p>If you wish to have your module engage a handler, you need
+ only to set <code>r->handler</code> to the name of the
+ handler at any time prior to the <code>invoke_handler</code>
+ stage of the request. Handlers are implemented as they were
+ before, albeit using the handler name instead of a content
+ type. While it is not necessary, the naming convention for
+ handlers is to use a dash-separated word, with no slashes, so
+ as to not invade the media type name-space.</p>
+ </div></div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="./en/handler.html" title="English"> en </a> |
+<a href="./es/handler.html" hreflang="es" rel="alternate" title="Español"> es </a> |
+<a href="./fr/handler.html" hreflang="fr" rel="alternate" title="Français"> fr </a> |
+<a href="./ja/handler.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> |
+<a href="./ko/handler.html" hreflang="ko" rel="alternate" title="Korean"> ko </a> |
+<a href="./ru/handler.html" hreflang="ru" rel="alternate" title="Russian"> ru </a> |
+<a href="./tr/handler.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
+</div><div id="footer">
+<p class="apache">Copyright 2009 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
+<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p></div>
+</body></html>
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