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<title>mod_example - Apache HTTP Server Version 2.2</title>
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<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p>
<p class="apache">Apache HTTP Server Version 2.2</p>
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<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 2.2</a> > <a href="./">Modules</a></div>
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<div class="retired"><h4>Please note</h4>
<p> This document refers to a legacy release (<strong>2.2</strong>) of Apache httpd. The active release (<strong>2.4</strong>) is documented <a href="http://httpd.apache.org/docs/current">here</a>. If you have not already upgraded, please follow <a href="http://httpd.apache.org/docs/current/upgrading.html">this link</a> for more information.</p>
<p>You may follow <a href="http://httpd.apache.org/docs/current/mod/mod_example.html">this link</a> to go to the current version of this document.</p></div><div id="preamble"><h1>Apache Module mod_example</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_example.html" title="English"> en </a> |
<a href="../ko/mod/mod_example.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
</div>
<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Illustrates the Apache module API</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>example_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_example.c</td></tr></table>
<h3>Summary</h3>
<p>Some files in the <code>modules/experimental</code> directory
under the Apache distribution directory tree are provided as an
example to those that wish to write modules that use the Apache
API.</p>
<p>The main file is <code>mod_example.c</code>, which
illustrates all the different callback mechanisms and call
syntaxes. By no means does an add-on module need to include
routines for all of the callbacks - quite the contrary!</p>
<p>The example module is an actual working module. If you link
it into your server, enable the "example-handler" handler for a
location, and then browse to that location, you will see a
display of some of the tracing the example module did as the
various callbacks were made.</p>
</div>
<div id="quickview"><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#compiling">Compiling the example module</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#using">Using the <code>mod_example</code> Module</a></li>
</ul><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#example">Example</a></li>
</ul>
<ul class="seealso"><li><a href="#comments_section">Comments</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="compiling" id="compiling">Compiling the example module</a></h2>
<p>To include the example module in your server, follow the
steps below:</p>
<ol>
<li>
Run <code class="program"><a href="../programs/configure.html">configure</a></code> with <code>--enable-example</code>
option.</li>
<li>Make the server (run "<code>make</code>").</li>
</ol>
<p>To add another module of your own:</p>
<ol class="up-A">
<li><code>cp modules/experimental/mod_example.c
modules/new_module/<em>mod_myexample.c</em></code></li>
<li>Modify the file.</li>
<li>Create <code>modules/new_module/config.m4</code>.
<ol>
<li>Add <code>APACHE_MODPATH_INIT(new_module)</code>.</li>
<li>Copy APACHE_MODULE line with "example" from
<code>modules/experimental/config.m4</code>.</li>
<li>Replace the first argument "example" with <em>myexample</em>.</li>
<li>Replace the second argument with brief description of your module.
It will be used in <code>configure --help</code>.</li>
<li>If your module needs additional C compiler flags, linker flags or
libraries, add them to CFLAGS, LDFLAGS and LIBS accordingly.
See other <code>config.m4</code> files in modules directory for
examples.</li>
<li>Add <code>APACHE_MODPATH_FINISH</code>.</li>
</ol>
</li>
<li>Create <code>module/new_module/Makefile.in</code>.
If your module doesn't need special build instructions,
all you need to have in that file is
<code>include $(top_srcdir)/build/special.mk</code>.</li>
<li>Run ./buildconf from the top-level directory.</li>
<li>Build the server with --enable-myexample</li>
</ol>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="using" id="using">Using the <code>mod_example</code> Module</a></h2>
<p>To activate the example module, include a block similar to
the following in your <code>httpd.conf</code> file:</p>
<div class="example"><p><code>
<Location /example-info><br />
SetHandler example-handler<br />
</Location>
</code></p></div>
<p>As an alternative, you can put the following into a <a href="core.html#accessfilename"><code>.htaccess</code></a> file
and then request the file "test.example" from that location:</p>
<div class="example"><p><code>
AddHandler example-handler .example
</code></p></div>
<p>After reloading/restarting your server, you should be able
to browse to this location and see the brief display mentioned
earlier.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="Example" id="Example">Example</a> <a name="example" id="example">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Demonstration directive to illustrate the Apache module
API</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>Example</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_example</td></tr>
</table>
<p>The <code class="directive">Example</code> directive just sets a demonstration
flag which the example module's content handler displays. It
takes no arguments. If you browse to an URL to which the
example content-handler applies, you will get a display of the
routines within the module and how and in what order they were
called to service the document request. The effect of this
directive one can observe under the point "<code>Example
directive declared here: YES/NO</code>".</p>
</div>
</div>
<div class="bottomlang">
<p><span>Available Languages: </span><a href="../en/mod/mod_example.html" title="English"> en </a> |
<a href="../ko/mod/mod_example.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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