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From rbo...@apache.org
Subject svn commit: r1329864 [2/3] - in /httpd/httpd/branches/2.4.x/docs/manual: developer/ mod/ programs/ rewrite/
Date Tue, 24 Apr 2012 17:15:09 GMT

Modified: httpd/httpd/branches/2.4.x/docs/manual/developer/modguide.html.en
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/docs/manual/developer/modguide.html.en?rev=1329864&r1=1329863&r2=1329864&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/docs/manual/developer/modguide.html.en (original)
+++ httpd/httpd/branches/2.4.x/docs/manual/developer/modguide.html.en Tue Apr 24 17:15:08 2012
@@ -1,1664 +1,1699 @@
-<?xml version="1.0" encoding="ISO-8859-1"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head><!--
-        XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
-              This file is generated from xml source: DO NOT EDIT
-        XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
-      -->
-<title>Developing modules for the Apache HTTP Server 2.4 - Apache HTTP Server</title>
-<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" />
-<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" />
-<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" />
-<link href="../images/favicon.ico" rel="shortcut icon" /></head>
-<body id="manual-page"><div id="page-header">
-<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 2.4</p>
-<img alt="" src="../images/feather.gif" /></div>
-<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
-<div id="path">
-<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.4</a> &gt; <a href="./">Developer</a></div><div id="page-content"><div id="preamble"><h1>Developing modules for the Apache HTTP Server 2.4</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/developer/modguide.html" title="English">&nbsp;en&nbsp;</a></p>
-</div>
-
-<p>This document explains how you can develop modules for the Apache HTTP 
-Server 2.4</p>
-</div>
-<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#introduction">Introduction</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#basics">Defining a module</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#hooking">Getting started: Hooking into the server</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#handling">Building a handler</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#configuration">Adding configuration options</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#context">Context aware configurations</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#summary">Summing up</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#snippets">Some useful snippets of code</a></li>
-</ul><h3>See also</h3><ul class="seealso"><li><a href="request.html">Request Processing in Apache 2.4</a></li><li><a href="hooks.html">Apache 2.x Hook Functions</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="introduction" id="introduction">Introduction</a></h2>
-<h3><a name="what" id="what">What we will be discussing in this document</a></h3>
-<p>
-This document will discuss how you can easily create modules for the Apache 
-HTTP Server 2.4, by exploring an example module called 
-<code>mod_example</code>. In the first part of this document, the purpose 
-of this module will be to calculate and print out various digest values for 
-existing files on your web server, whenever we access the URL <code>
-http://hostname/filename.sum</code>. For instance, if we want to know the 
-MD5 digest value of the file located at <code>
-http://www.example.com/index.html</code>, we would visit <code>
-http://www.example.com/index.html.sum</code>. 
-</p>
-<p>
-In the second part of this document, which deals with configuration 
-directive and context awareness, we will be looking at a module that simply 
-write out its own configuration to the client.
-</p>
-
-<h3><a name="prerequisites" id="prerequisites">Prerequisites</a></h3>
-<p>
-First and foremost, you are expected to have a basic knowledge of how the C 
-programming language works. In most cases, we will try to be as pedagogical 
-as possible and link to documents describing the functions used in the 
-examples, but there are also many cases where it is necessary to either 
-just assume that "it works" or do some digging yourself into what the hows 
-and whys of various function calls. 
-</p>
-<p>
-Lastly, you will need to have a basic understanding of how modules are 
-loaded and configured in the Apache HTTP Server, as well as how to get the headers for 
-Apache if you do not have them already, as these are needed for compiling 
-new modules.
-</p>
-
-<h3><a name="compiling" id="compiling">Compiling your module</a></h3>
-<p>
-To compile the source code we are building in this document, we will be 
-using <a href="../programs/apxs.html">APXS</a>. Assuming your source file 
-is called mod_example.c, compiling, installing and activating the module is 
-as simple as: 
-<div class="example"><pre>
-apxs -i -a -c mod_example.c
-</pre></div>
-</p>
-
-</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="basics" id="basics">Defining a module</a></h2>
-<img src="../images/build_a_mod_3.png" /><br />
-<p>Every module starts with the same declaration, or name tag if you will, 
-that defines a module as <em>a separate entity within Apache</em>:
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-module AP_MODULE_DECLARE_DATA   example_module <code style="color:#806030; ">=</code>
-<code style="color:#806030; ">{</code>
-    STANDARD20_MODULE_STUFF<code style="color:#806030; ">,</code>
-    create_dir_conf<code style="color:#806030; ">,</code> <code style="color:#c34e00; ">/* Per-directory configuration handler */</code>
-    merge_dir_conf<code style="color:#806030; ">,</code>  <code style="color:#c34e00; ">/* Merge handler for per-directory configurations */</code>
-    create_svr_conf<code style="color:#806030; ">,</code> <code style="color:#c34e00; ">/* Per-server configuration handler */</code>
-    merge_svr_conf<code style="color:#806030; ">,</code>  <code style="color:#c34e00; ">/* Merge handler for per-server configurations */</code>
-    directives<code style="color:#806030; ">,</code>      <code style="color:#c34e00; ">/* Any directives we may have for httpd */</code>
-    register_hooks   <code style="color:#c34e00; ">/* Our hook registering function */</code>
-<code style="color:#806030; ">}</code><code style="color:#806030; ">;</code>
-</pre>
-
-
-
-This bit of code lets the server know that we have now registered a new module 
-in the system, and that its name is <code>example_module</code>. The name 
-of the module is used primarily for two things:<br />
-<ul>
-<li>Letting the server know how to load the module using the LoadModule</li>
-<li>Setting up a namespace for the module to use in configurations</li>
-</ul>
-For now, we're only concerned with the first purpose of the module name, 
-which comes into play when we need to load the module:<br />
-<div class="example"><pre><a href="../mod/mod_so.html#LoadModule">LoadModule</a> example_module modules/mod_example.so</pre></div>
-In essence, this tells the server to open up <code>mod_example.so</code> and look for a module 
-called <code>example_module</code>.
-</p>
-<p>
-Within this name tag of ours is also a bunch of references to how we would 
-like to handle things: Which directives do we respond to in a configuration 
-file or .htaccess, how do we operate within specific contexts, and what 
-handlers are we interested in registering with the Apache HTTP service. We'll 
-return to all these elements later in this document.
-</p>
-</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="hooking" id="hooking">Getting started: Hooking into the server</a></h2>
-<h3><a name="hook_intro" id="hook_intro">An introduction to hooks</a></h3>
-<p>
-When handling requests in Apache HTTP Server 2.4, the first thing you will need to do is 
-create a hook into the request handling process. A hook is essentially a 
-message telling the server that you are willing to either serve or at least 
-take a glance at certain requests given by clients. All handlers, whether 
-it's mod_rewrite, mod_authn_*, mod_proxy and so on, are hooked into 
-specific parts of the request process. As you are probably aware, modules 
-serve different purposes; Some are authentication/authorization handlers, 
-others are file or script handlers while some third modules rewrite URIs or 
-proxies content. Furthermore, in the end, it is up to the user of the server 
-how and when each module will come into place. Thus, the server itself does not 
-presume to know which module is responsible for handling a specific 
-request, and will ask each module whether they have an interest in a given 
-request or not. It is then up to each module to either gently decline 
-serving a request, accept serving it or flat out deny the request from 
-being served, as authentication/authorization modules do: <br />
-<img src="../images/build_a_mod_2.png" /><br />
-To make it a bit easier for handlers such as our mod_example to know 
-whether the client is requesting content we should handle or not, the server 
-has directives for hinting to modules whether their assistance is needed or 
-not. Two of these are <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code> 
-and <code class="directive"><a href="../mod/core.html#sethandler">SetHandler</a></code>. Let's take a look at 
-an example using <code class="directive"><a href="../mod/mod_mime.html#addhandler">AddHandler</a></code>. In 
-our example case, we want every request ending with .sum to be served by 
-<code>mod_example</code>, so we'll add a configuration directive that tells 
-the server to do just that:
-<div class="example"><pre>
-AddHandler example-handler .sum
-</pre></div>
-What this tells the server is the following: <em>Whenever we receive a request 
-for a URI ending in .sum, we are to let all modules know that we are 
-looking for whoever goes by the name of "example-handler" </em>. 
-Thus, when a request is being served that ends in .sum, the server will let all 
-modules know, that this request should be served by "example-handler
-". As you will see later, when we start building mod_example, we will 
-check for this handler tag relayed by <code>AddHandler</code> and reply to 
-the server based on the value of this tag.
-</p>
-
-<h3><a name="hook_declaration" id="hook_declaration">Hooking into httpd</a></h3>
-<p>
-To begin with, we only want to create a simple handler, that replies to the 
-client browser when a specific URL is requested, so we won't bother setting 
-up configuration handlers and directives just yet. Our initial module 
-definition will look like this:<br />
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-module AP_MODULE_DECLARE_DATA   example_module =
-{
-    STANDARD20_MODULE_STUFF,
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,
-    <code style="color:#800040; ">register_hooks</code>   <code style="color:#c34e00; "><code style="color:#c34e00; ">/* Our hook registering function */</code></code>
-};
-</pre>
-
-
-
-This lets the server know that we are not interesting in anything fancy, we 
-just want to hook onto the requests and possibly handle some of them. </p> 
-<p> The reference in our example declaration, <code>register_hooks</code> 
-is the name of a function we will create to manage how we hook onto the 
-request process. In this example module, the function has just one purpose; 
-To create a simple hook that gets called after all the rewrites, access 
-control etc has been handled. Thus, we will let the server know, that we want 
-to hook into its process as one of the last modules: 
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">void</code> register_hooks<code style="color:#806030; ">(</code>apr_pool_t <code style="color:#806030; ">*</code>pool<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#c34e00; ">/* Create a hook in the request handler, so we get called when a request arrives */</code>
-    <code style="color:#800040; ">ap_hook_handler</code><code style="color:#806030; ">(</code>example_handler<code style="color:#806030; ">,</code> <code style="color:#7f0055; font-weight:bold; ">NULL</code><code style="color:#806030; ">,</code> <code style="color:#7f0055; font-weight:bold; ">NULL</code><code style="color:#806030; ">,</code> APR_HOOK_LAST<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-</pre>
-
-
-
-The <code>example_handler</code> reference is the function that will handle 
-the request. We will discuss how to create a handler in the next chapter.
-</p>
-
-<h3><a name="hook_others" id="hook_others">Other useful hooks</a></h3>
-<p>
-Hooking into the request handling phase is but one of many hooks that you 
-can create. Some other ways of hooking are:
-<ul>
-<li><code>ap_hook_child_init</code>: Place a hook that executes when a child process is spawned (commonly used for initializing modules after the server has forked)</li>
-<li><code>ap_hook_pre_config</code>: Place a hook that executes before any configuration data has been read (very early hook)</li>
-<li><code>ap_hook_post_config</code>: Place a hook that executes after configuration has been parsed, but before the server has forked</li>
-<li><code>ap_hook_translate_name</code>: Place a hook that executes when a URI needs to be translated into a filename on the server (think <code>mod_rewrite</code>)</li>
-</ul>
-</p>
-
-</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="handling" id="handling">Building a handler</a></h2>
-<p>
-A handler is essentially a function that receives a callback when a request 
-to the server is made. It is passed a record of the current request (how it was 
-made, which headers and requests were passed along, who's giving the 
-request and so on), and is put in charge of either telling the server that it's 
-not interested in the request or handle the request with the tools provided.
-</p>
-<h3><a name="simple_handler" id="simple_handler">A simple "Hello, world!" 
-handler</a></h3> Let's start off by making a very simple request handler 
-that does the following: <br />
-<ol>
-<li>Check that this is a request that should be served by "example-handler"</li>
-<li>Set the content type of our output to <code>text/html</code></li>
-<li>Write "Hello, world!" back to the client browser</li>
-<li>Let the server know that we took care of this request and everything went fine</li>
-</ol>
-In C code, our example handler will now look like this:<br />
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">int</code> example_handler<code style="color:#806030; ">(</code>request_rec <code style="color:#806030; ">*</code>r<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#c34e00; ">/* First off, we need to check if this is a call for the "example-handler" handler.</code>
-<code style="color:#c34e00; ">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;* If it is, we accept it and do our things, if not, we simply return DECLINED,</code>
-<code style="color:#c34e00; ">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;* and the server will try somewhere else.</code>
-<code style="color:#c34e00; ">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/</code>
-    <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">handler</code> <code style="color:#806030; ">|</code><code style="color:#806030; ">|</code> <code style="color:#800040; ">strcmp</code><code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">handler</code><code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">example-handler</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">)</code> <code style="color:#400000; font-weight:bold; ">return</code> <code style="color:#806030; ">(</code>DECLINED<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* Now that we are handling this request, we'll write out "Hello, world!" to the client.</code>
-<code style="color:#c34e00; ">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;* To do so, we must first set the appropriate content type, followed by our output.</code>
-<code style="color:#c34e00; ">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/</code>
-    <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#gaa2f8412c400197338ec509f4a45e4579">ap_set_content_type</a><code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">text/html</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#ga5e91eb6ca777c9a427b2e82bf1eeb81d">ap_rprintf</a><code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">Hello, world!</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* Lastly, we must tell the server that we took care of this request and everything went fine.</code>
-<code style="color:#c34e00; ">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;* We do so by simply returning the value OK to the server.</code>
-<code style="color:#c34e00; ">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*/</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> OK<code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-</pre>
-
-
-
-Now, we put all we have learned together and end up with a program that 
-looks like 
-<a href="http://people.apache.org/~humbedooh/mods/examples/mod_example_1.c">mod_example_1.c</a>
-. The functions used in this example will be explained later in the section 
-<a href="#functions">"Some useful functions you should know"</a>
-.  <h3><a name="request_rec" id="request_rec">The request_rec structure 
-</a></h3> <p>The most essential part of any request is the <em>request record
-</em>. In a call to a handler function, this is represented by the <code>
-request_req* </code> structure passed along with every call that is made. 
-This struct, typically just refered to as <code>r</code> in modules, 
-contains all the information you need for your module to fully process any 
-HTTP request and respond accordingly.</p> <p>Some key elements of the <code>
-request_req </code> structure are:
-<ul>
-<li><code><code style="color:#008833">r-&gt;handler</code> (char*)</code>: Contains the name of the handler the server is currently asking to do the handling of this request</li>
-<li><code><code style="color:#008833">r-&gt;method</code> (char*)</code>: Contains the HTTP method being used, f.x. GET or POST</li>
-<li><code><code style="color:#008833">r-&gt;filename</code> (char*)</code>: Contains the translated filename the client is requesting</li>
-<li><code><code style="color:#008833">r-&gt;args</code> (char*)</code>: Contains the query string of the request, if any</li>
-<li><code><code style="color:#008833">r-&gt;headers_in</code> (apr_table_t*)</code>: Contains all the headers sent by the client</li>
-<li><code><code style="color:#008833">r-&gt;connection</code> (conn_rec*)</code>: A record containing information about the current connection</li>
-<li><code><code style="color:#008833">r-&gt;useragent_ip</code> (char*)</code>: The IP address of the client connecting to us</li>
-<li><code><code style="color:#008833">r-&gt;pool</code> (apr_pool_t*)</code>: The memory pool of this request. We'll discuss this in the "
-<a href="#memory">Memory management</a>" chapter.</li>
-</ul>
-A complete list of all the values contained with in the <code>request_req</code> structure can be found in 
-the <a href="http://svn.apache.org/repos/asf/httpd/httpd/trunk/include/httpd.h"><code>httpd.h</code></a> header 
-file or at <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/structrequest__rec.html">http://ci.apache.org/projects/httpd/trunk/doxygen/structrequest__rec.html</a>.
-</p>
-<p>
-Let's try out some of these variables in another example handler:<br />
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">int</code> example_handler<code style="color:#806030; ">(</code>request_rec <code style="color:#806030; ">*</code>r<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#c34e00; ">/* Set the appropriate content type */</code>
-    <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#gaa2f8412c400197338ec509f4a45e4579">ap_set_content_type</a><code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">text/html</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-
-    <code style="color:#c34e00; ">/* Print out the IP address of the client connecting to us: */</code>
-    <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#ga5e91eb6ca777c9a427b2e82bf1eeb81d">ap_rprintf</a><code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;h2&gt;Hello, </code><code style="color:#0f6900; ">%s</code><code style="color:#e60000; ">!&lt;/h2&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">useragent_ip</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* If we were reached through a GET or a POST request, be happy, else sad. */</code>
-    <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code> <code style="color:#806030; ">!</code><code style="color:#800040; ">strcmp</code><code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">method</code><code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">POST</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code> <code style="color:#806030; ">|</code><code style="color:#806030; ">|</code> <code style="color:#806030; ">!</code><code style="color:#800040; ">strcmp</code><code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">method</code><code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">GET</code><code style="color:
 #800000; ">"</code><code style="color:#806030; ">)</code> <code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-        ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">You used a GET or a POST method, that makes us happy!&lt;br&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#806030; ">}</code>
-    <code style="color:#400000; font-weight:bold; ">else</code> <code style="color:#806030; ">{</code>
-        ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">You did not use POST or GET, that makes us sad :(&lt;br&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#806030; ">}</code>
-
-    <code style="color:#c34e00; ">/* Lastly, if there was a query string, let's print that too! */</code>
-    <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">args</code><code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-        <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#ga5e91eb6ca777c9a427b2e82bf1eeb81d">ap_rprintf</a><code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">Your query string was: </code><code style="color:#0f6900; ">%s</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">args</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#806030; ">}</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> OK<code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-</pre>
-
-
-
-</p>
-
-
-<h3><a name="return_value" id="return_value">Return values</a></h3>
-<p>
-Apache relies on return values from handlers to signify whether a request 
-was handled or not, and if so, whether the request went well or not. If a 
-module is not interested in handling a specific request, it should always 
-return the value <code>DECLINED</code>. If it is handling a request, it 
-should either return the generic value <code>OK</code>, or a specific HTTP 
-status code, for example:
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">int</code> example_handler<code style="color:#806030; ">(</code>request_rec <code style="color:#806030; ">*</code>r<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#c34e00; ">/* Return 404: Not found */</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> HTTP_NOT_FOUND<code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-</pre>
-
-
-
-Returning <code>OK</code> or a HTTP status code does not necessarily mean 
-that the request will end. The server may still have other handlers that are 
-interested in this request, for instance the logging modules which, upon a 
-successful request, will write down a summary of what was requested and how 
-it went. To do a full stop and prevent any further processing after your 
-module is done, you can return the value <code>DONE</code> to let the server 
-know that it should cease all activity on this request and carry on with 
-the next, without informing other handlers.
-<br />
-<strong>General response codes:</strong>
-<ul>
-<li><code>DECLINED</code>: We are not handling this request</li>
-<li><code>OK</code>: We handled this request and it went well</li>
-<li><code>DONE</code>: We handled this request and the server should just close this thread without further processing</li>
-</ul><br />
-<strong>HTTP specific return codes (excerpt):</strong>
-<ul>
-<li><code>HTTP_OK (200)</code>: Request was okay</li>
-<li><code>HTTP_MOVED_PERMANENTLY (301)</code>: The resource has moved to a new URL</li>
-<li><code>HTTP_UNAUTHORIZED (401)</code>: Client is not authorized to visit this page</li>
-<li><code>HTTP_FORBIDDEN (403)</code>: Permission denied</li>
-<li><code>HTTP_NOT_FOUND (404)</code>: File not found</li>
-<li><code>HTTP_INTERNAL_SERVER_ERROR (500)</code>: Internal server error (self explanatory)</li>
-</ul>
-</p>
-
-
-<h3><a name="functions" id="functions">Some useful functions you should know</a></h3>
-
-<ul>
-<li>
-    <code>ap_rputs(const char *string, request_req *r)</code>: <br />
-    Sends a string of text to the client. This is a shorthand version of <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#gac827cd0537d2b6213a7c06d7c26cc36e">
-    ap_rwrite</a>.
-    
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">Hello, world!</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code></pre>
-
-
-
-</li>
-<li>
-    <code>
-    <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#ga5e91eb6ca777c9a427b2e82bf1eeb81d">ap_rprintf</a></code>: <br />
-    This function works just like <code>printf</code>, except it sends the result to the client. 
-    
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;"><code style="color:#2e8800; "><a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#ga5e91eb6ca777c9a427b2e82bf1eeb81d">ap_rprintf</a></code><code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">Hello, </code><code style="color:#0f6900; ">%s</code><code style="color:#e60000; ">!</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">useragent_ip</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code></pre>
-
-
-</li>
-<li>
-    <code>
-    <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#gaa2f8412c400197338ec509f4a45e4579">ap_set_content_type</a>(request_req *r, const char *type)</code>: <br />
-    Sets the content type of the output you are sending.
-    
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;"><code style="color:#2e8800; "><a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__PROTO.html#gaa2f8412c400197338ec509f4a45e4579">ap_set_content_type</a></code><code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">text/plain</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code> <code style="color:#c34e00; ">/* force a raw text output */</code></pre>
-
-
-</li>
-
-
-</ul>
-
-
-<h3><a name="memory" id="memory">Memory management</a></h3>
-<p>
-Managing your resources in Apache HTTP Server 2.4 is quite easy, thanks to the memory pool 
-system. In essence, each server, connection and request have their own 
-memory pool that gets cleaned up when its scope ends, e.g. when a request 
-is done or when a server process shuts down. All your module needs to do is 
-latch onto this memory pool, and you won't have to worry about having to 
-clean up after yourself - pretty neat, huh?
-</p>
-
-<p>
-In our module, we will primarily be allocating memory for each request, so 
-it's appropriate to use the <code style="color:#008833">r-&gt;pool</code> 
-reference when creating new objects. A few of the functions for allocating 
-memory within a pool are:
-<ul>
-<li><code>void* <a href="http://apr.apache.org/docs/apr/1.4/group__apr__pools.html#ga85f1e193c31d109affda72f9a92c6915">apr_palloc</a>(
-apr_pool_t *p, apr_size_t size)</code>: Allocates <code>size</code> number of bytes in the pool for you</li>
-<li><code>void* <a href="http://apr.apache.org/docs/apr/1.4/group__apr__pools.html#gaf61c098ad258069d64cdf8c0a9369f9e">apr_pcalloc</a>(
-apr_pool_t *p, apr_size_t size)</code>: Allocates <code>size</code> number of bytes in the pool for you and sets all bytes to 0</li>
-<li><code>char* <a href="http://apr.apache.org/docs/apr/1.4/group__apr__strings.html#gabc79e99ff19abbd7cfd18308c5f85d47">apr_pstrdup</a>(
-apr_pool_t *p, const char *s)</code>: Creates a duplicate of the string <code>s</code>. This is useful for copying constant values so you can edit them</li>
-<li><code>char* <a href="http://apr.apache.org/docs/apr/1.4/group__apr__strings.html#ga3eca76b8d293c5c3f8021e45eda813d8">apr_psprintf</a>(
-apr_pool_t *p, const char *fmt, ...)</code>: Similar to <code>sprintf</code>, except the server supplies you with an appropriately allocated target variable</li>
-
-</ul>
-Let's put these functions into an example handler:<br />
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">int</code> example_handler<code style="color:#806030; ">(</code>request_rec <code style="color:#806030; ">*</code>r<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code><code style="color:#806030; ">*</code> original <code style="color:#806030; ">=</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">You can't edit this!</code><code style="color:#800000; ">"</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">char</code><code style="color:#806030; ">*</code> copy<code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">int</code><code style="color:#806030; ">*</code> integers<code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* Allocate space for 10 integer values and set them all to zero. */</code>
-    integers <code style="color:#806030; ">=</code> apr_pcalloc<code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code>pool<code style="color:#806030; ">,</code> <code style="color:#400000; font-weight:bold; ">sizeof</code><code style="color:#806030; ">(</code><code style="color:#400000; font-weight:bold; ">int</code><code style="color:#806030; ">)</code><code style="color:#806030; ">*</code><code style="color:#c00000; ">10</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code> 
-    
-    <code style="color:#c34e00; ">/* Create a copy of the 'original' variable that we can edit. */</code>
-    copy <code style="color:#806030; ">=</code> apr_pstrdup<code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code>pool<code style="color:#806030; ">,</code> original<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> OK<code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-</pre>
-
-
-This is all well and good for our module, which won't need any 
-pre-initialized variables or structures. However, if we wanted to 
-initialize something early on, before the requests come rolling in, we 
-could simply add a call to a function in our <code>register_hooks</code> 
-function to sort it out:
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">void</code> register_hooks<code style="color:#806030; ">(</code>apr_pool_t <code style="color:#806030; ">*</code>pool<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#c34e00; ">/* Call a function that initializes some stuff */</code>
-    <code style="color:#800040; ">example_init_function</code><code style="color:#806030; ">(</code>pool<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#c34e00; ">/* Create a hook in the request handler, so we get called when a request arrives */</code>
-    <code style="color:#800040; ">ap_hook_handler</code><code style="color:#806030; ">(</code>example_handler<code style="color:#806030; ">,</code> <code style="color:#7f0055; font-weight:bold; ">NULL</code><code style="color:#806030; ">,</code> <code style="color:#7f0055; font-weight:bold; ">NULL</code><code style="color:#806030; ">,</code> APR_HOOK_LAST<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-</pre>
-
-
-In this pre-request initialization function we would not be using the 
-same pool as we did when allocating resources for request-based functions. 
-Instead, we would use the pool given to us by the server for allocating memory 
-on a per-process based level.
-
-</p>
-
-
-<h3><a name="parsing" id="parsing">Parsing request data</a></h3>
-<p>
-In our example module, we would like to add a feature, that checks which 
-type of digest, MD5 or SHA1 the client would like to see. This could be 
-solved by adding a query string to the request. A query string is typically 
-comprised of several keys and values put together in a string, for instance 
-<code>valueA=yes&amp;valueB=no&amp;valueC=maybe</code>. It is up to the 
-module itself to parse these and get the data it requires. In our example, 
-we'll be looking for a key called <code>digest</code>, and if set to <code>
-md5</code>, we'll produce an MD5 digest, otherwise we'll produce a SHA1 
-digest.
-</p>
-<p>
-Since the introduction of Apache HTTP Server 2.4, parsing request data from GET and 
-POST requests have never been easier. All we require to parse both GET and 
-POST data is four simple lines: 
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__apr__tables.html#gad7ea82d6608a4a633fc3775694ab71e4">apr_table_t</a> *GET;
-<a href="http://ci.apache.org/projects/httpd/trunk/doxygen/structapr__array__header__t.html">apr_array_header_t</a> *POST;
-
-<a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__SCRIPT.html#gaed25877b529623a4d8f99f819ba1b7bd">ap_args_to_table</a>(r, &amp;GET);
-<a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__DAEMON.html#ga9d426b6382b49754d4f87c55f65af202">ap_parse_form_data</a>(r, <code style="color:#7f0055; font-weight:bold; ">NULL</code>, &amp;POST, -1, 8192);
-</pre>
-
-
-
-In our specific example module, we're looking for the <code>digest</code> 
-value from the query string, which now resides inside a table called <code>
-GET</code>. To extract this value, we need only perform a simple operation:
-<br />
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#c34e00; ">/* Get the "digest" key from the query string, if any. */</code>
-<code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code><code style="color:#806030; "> *</code>digestType <code style="color:#806030; ">=</code> <a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__apr__tables.html#ga4db13e3915c6b9a3142b175d4c15d915">apr_table_get</a><code style="color:#806030; ">(</code>GET<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">digest</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-
-<code style="color:#c34e00; ">/* If no key was returned, we will set a default value instead. */</code>
-<code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>digestType<code style="color:#806030; ">)</code> digestType <code style="color:#806030; ">=</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">sha1</code><code style="color:#800000; ">"</code><code style="color:#806030; ">;</code>
-
-</pre>
-
-
-
-The structures used for the POST and GET data are not exactly the same, so 
-if we were to fetch a value from POST data instead of the query string, we 
-would have to resort to a few more lines, as outlined in <a href="#get_post">this example</a> in the last chapter of this document.
-</p>
-
-
-<h3><a name="advanced_handler" id="advanced_handler">Making an advanced handler</a></h3>
-Now that we have learned how to parse form data and manage our resources, 
-we can move on to creating an advanced version of our module, that spits 
-out the MD5 or SHA1 digest of files:<br />
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">int</code> example_handler<code style="color:#806030; ">(</code>request_rec <code style="color:#806030; ">*</code>r<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#400000; font-weight:bold; ">int</code> rc<code style="color:#806030; ">,</code> exists<code style="color:#806030; ">;</code>
-    apr_finfo_t finfo<code style="color:#806030; ">;</code>
-    apr_file_t<code style="color:#806030; "> *</code>file<code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">char</code> <code style="color:#806030; ">*</code>filename<code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">char</code> buffer<code style="color:#806030; ">[</code><code style="color:#c00000; ">256</code><code style="color:#806030; ">]</code><code style="color:#806030; ">;</code>
-    apr_size_t readBytes<code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">int</code> n<code style="color:#806030; ">;</code>
-    apr_table_t<code style="color:#806030; "> *</code>GET<code style="color:#806030; ">;</code>
-    apr_array_header_t<code style="color:#806030; "> *</code>POST<code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code><code style="color:#806030; "> *</code>digestType<code style="color:#806030; ">;</code>
-    
-    
-    <code style="color:#c34e00; ">/* Check that the "example-handler" handler is being called. */</code>
-    <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">handler</code> <code style="color:#806030; ">|</code><code style="color:#806030; ">|</code> <code style="color:#800040; ">strcmp</code><code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">handler</code><code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">example-handler</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">)</code> <code style="color:#400000; font-weight:bold; ">return</code> <code style="color:#806030; ">(</code>DECLINED<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* Figure out which file is being requested by removing the .sum from it */</code>
-    filename <code style="color:#806030; ">=</code> apr_pstrdup<code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">pool</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">filename</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    filename<code style="color:#806030; ">[</code><code style="color:#800040; ">strlen</code><code style="color:#806030; ">(</code>filename<code style="color:#806030; ">)</code><code style="color:#806030; ">-</code><code style="color:#c00000; ">4</code><code style="color:#806030; ">]</code> <code style="color:#806030; ">=</code> <code style="color:#c00000; ">0</code><code style="color:#806030; ">;</code> <code style="color:#c34e00; ">/* Cut off the last 4 characters. */</code>
-    
-    <code style="color:#c34e00; ">/* Figure out if the file we request a sum on exists and isn't a directory */</code>
-    rc <code style="color:#806030; ">=</code> apr_stat<code style="color:#806030; ">(</code><code style="color:#806030; ">&amp;</code>finfo<code style="color:#806030; ">,</code> filename<code style="color:#806030; ">,</code> APR_FINFO_MIN<code style="color:#806030; ">,</code> r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">pool</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code>rc <code style="color:#806030; ">=</code><code style="color:#806030; ">=</code> APR_SUCCESS<code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-        exists <code style="color:#806030; ">=</code>
-        <code style="color:#806030; ">(</code>
-            <code style="color:#806030; ">(</code>finfo<code style="color:#806030; ">.</code>filetype <code style="color:#806030; ">!</code><code style="color:#806030; ">=</code> APR_NOFILE<code style="color:#806030; ">)</code>
-        <code style="color:#806030; ">&amp;</code><code style="color:#806030; ">&amp;</code>  <code style="color:#806030; ">!</code><code style="color:#806030; ">(</code>finfo<code style="color:#806030; ">.</code>filetype <code style="color:#806030; ">&amp;</code> APR_DIR<code style="color:#806030; ">)</code>
-        <code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-        <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>exists<code style="color:#806030; ">)</code> <code style="color:#400000; font-weight:bold; ">return</code> HTTP_NOT_FOUND<code style="color:#806030; ">;</code> <code style="color:#c34e00; ">/* Return a 404 if not found. */</code>
-    <code style="color:#806030; ">}</code>
-    <code style="color:#c34e00; ">/* If apr_stat failed, we're probably not allowed to check this file. */</code>
-    <code style="color:#400000; font-weight:bold; ">else</code> <code style="color:#400000; font-weight:bold; ">return</code> HTTP_FORBIDDEN<code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* Parse the GET and, optionally, the POST data sent to us */</code>
-    
-    ap_args_to_table<code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#806030; ">&amp;</code>GET<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    ap_parse_form_data<code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">,</code> <code style="color:#806030; ">&amp;</code>POST<code style="color:#806030; ">,</code> <code style="color:#806030; ">-</code><code style="color:#c00000; ">1</code><code style="color:#806030; ">,</code> <code style="color:#c00000; ">8192</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* Set the appropriate content type */</code>
-    ap_set_content_type<code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">text/html</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* Print a title and some general information */</code>
-    ap_rprintf<code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;h2&gt;Information on </code><code style="color:#0f6900; ">%s</code><code style="color:#e60000; ">:&lt;/h2&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> filename<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    ap_rprintf<code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;b&gt;Size:&lt;/b&gt; </code><code style="color:#0f6900; ">%u</code><code style="color:#e60000; "> bytes&lt;br/&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> finfo<code style="color:#806030; ">.</code>size<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    
-    <code style="color:#c34e00; ">/* Get the digest type the client wants to see */</code>
-    digestType <code style="color:#806030; ">=</code> apr_table_get<code style="color:#806030; ">(</code>GET<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">digest</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>digestType<code style="color:#806030; ">)</code> digestType <code style="color:#806030; ">=</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">MD5</code><code style="color:#800000; ">"</code><code style="color:#806030; ">;</code>
-    
-    
-    rc <code style="color:#806030; ">=</code> apr_file_open<code style="color:#806030; ">(</code><code style="color:#806030; ">&amp;</code>file<code style="color:#806030; ">,</code> filename<code style="color:#806030; ">,</code> APR_READ<code style="color:#806030; ">,</code> APR_OS_DEFAULT<code style="color:#806030; ">,</code> r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">pool</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code>rc <code style="color:#806030; ">=</code><code style="color:#806030; ">=</code> APR_SUCCESS<code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-        
-        <code style="color:#c34e00; ">/* Are we trying to calculate the MD5 or the SHA1 digest? */</code>
-        <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>strcasecmp<code style="color:#806030; ">(</code>digestType<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">md5</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-            <code style="color:#c34e00; ">/* Calculate the MD5 sum of the file */</code>
-            <code style="color:#400000; font-weight:bold; ">union</code> <code style="color:#806030; ">{</code>
-                <code style="color:#400000; font-weight:bold; ">char</code>      chr<code style="color:#806030; ">[</code><code style="color:#c00000; ">16</code><code style="color:#806030; ">]</code><code style="color:#806030; ">;</code>
-                uint32_t  num<code style="color:#806030; ">[</code><code style="color:#c00000; ">4</code><code style="color:#806030; ">]</code><code style="color:#806030; ">;</code>
-            <code style="color:#806030; ">}</code> digest<code style="color:#806030; ">;</code>
-            apr_md5_ctx_t md5<code style="color:#806030; ">;</code>
-            apr_md5_init<code style="color:#806030; ">(</code><code style="color:#806030; ">&amp;</code>md5<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            readBytes <code style="color:#806030; ">=</code> <code style="color:#c00000; ">256</code><code style="color:#806030; ">;</code>
-            <code style="color:#400000; font-weight:bold; ">while</code> <code style="color:#806030; ">(</code> apr_file_read<code style="color:#806030; ">(</code>file<code style="color:#806030; ">,</code> buffer<code style="color:#806030; ">,</code> <code style="color:#806030; ">&amp;</code>readBytes<code style="color:#806030; ">)</code> <code style="color:#806030; ">=</code><code style="color:#806030; ">=</code> APR_SUCCESS <code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-                apr_md5_update<code style="color:#806030; ">(</code><code style="color:#806030; ">&amp;</code>md5<code style="color:#806030; ">,</code> buffer<code style="color:#806030; ">,</code> readBytes<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            <code style="color:#806030; ">}</code>
-            apr_md5_final<code style="color:#806030; ">(</code>digest<code style="color:#806030; ">.</code>chr<code style="color:#806030; ">,</code> <code style="color:#806030; ">&amp;</code>md5<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            
-            <code style="color:#c34e00; ">/* Print out the MD5 digest */</code>
-            ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;b&gt;MD5: &lt;/b&gt;&lt;code&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            <code style="color:#400000; font-weight:bold; ">for</code> <code style="color:#806030; ">(</code>n <code style="color:#806030; ">=</code> <code style="color:#c00000; ">0</code><code style="color:#806030; ">;</code> n <code style="color:#806030; ">&lt;</code> APR_MD5_DIGESTSIZE<code style="color:#806030; ">/</code><code style="color:#c00000; ">4</code><code style="color:#806030; ">;</code> n<code style="color:#806030; ">+</code><code style="color:#806030; ">+</code><code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-                ap_rprintf<code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#0f6900; ">%08x</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> digest<code style="color:#806030; ">.</code>num<code style="color:#806030; ">[</code>n<code style="color:#806030; ">]</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            <code style="color:#806030; ">}</code>
-            ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;/code&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            <code style="color:#c34e00; ">/* Print a link to the SHA1 version */</code>
-            ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;br/&gt;&lt;a href='?digest=sha1'&gt;View the SHA1 hash instead&lt;/a&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-        <code style="color:#806030; ">}</code>
-        <code style="color:#400000; font-weight:bold; ">else</code> <code style="color:#806030; ">{</code>
-            <code style="color:#c34e00; ">/* Calculate the SHA1 sum of the file */</code>
-            <code style="color:#400000; font-weight:bold; ">union</code> <code style="color:#806030; ">{</code>
-                <code style="color:#400000; font-weight:bold; ">char</code>      chr<code style="color:#806030; ">[</code><code style="color:#c00000; ">20</code><code style="color:#806030; ">]</code><code style="color:#806030; ">;</code>
-                uint32_t  num<code style="color:#806030; ">[</code><code style="color:#c00000; ">5</code><code style="color:#806030; ">]</code><code style="color:#806030; ">;</code>
-            <code style="color:#806030; ">}</code> digest<code style="color:#806030; ">;</code>
-            apr_sha1_ctx_t sha1<code style="color:#806030; ">;</code>
-            apr_sha1_init<code style="color:#806030; ">(</code><code style="color:#806030; ">&amp;</code>sha1<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            readBytes <code style="color:#806030; ">=</code> <code style="color:#c00000; ">256</code><code style="color:#806030; ">;</code>
-            <code style="color:#400000; font-weight:bold; ">while</code> <code style="color:#806030; ">(</code> apr_file_read<code style="color:#806030; ">(</code>file<code style="color:#806030; ">,</code> buffer<code style="color:#806030; ">,</code> <code style="color:#806030; ">&amp;</code>readBytes<code style="color:#806030; ">)</code> <code style="color:#806030; ">=</code><code style="color:#806030; ">=</code> APR_SUCCESS <code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-                apr_sha1_update<code style="color:#806030; ">(</code><code style="color:#806030; ">&amp;</code>sha1<code style="color:#806030; ">,</code> buffer<code style="color:#806030; ">,</code> readBytes<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            <code style="color:#806030; ">}</code>
-            apr_sha1_final<code style="color:#806030; ">(</code>digest<code style="color:#806030; ">.</code>chr<code style="color:#806030; ">,</code> <code style="color:#806030; ">&amp;</code>sha1<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            
-            <code style="color:#c34e00; ">/* Print out the SHA1 digest */</code>
-            ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;b&gt;SHA1: &lt;/b&gt;&lt;code&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            <code style="color:#400000; font-weight:bold; ">for</code> <code style="color:#806030; ">(</code>n <code style="color:#806030; ">=</code> <code style="color:#c00000; ">0</code><code style="color:#806030; ">;</code> n <code style="color:#806030; ">&lt;</code> APR_SHA1_DIGESTSIZE<code style="color:#806030; ">/</code><code style="color:#c00000; ">4</code><code style="color:#806030; ">;</code> n<code style="color:#806030; ">+</code><code style="color:#806030; ">+</code><code style="color:#806030; ">)</code> <code style="color:#806030; ">{</code>
-                ap_rprintf<code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#0f6900; ">%08x</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> digest<code style="color:#806030; ">.</code>num<code style="color:#806030; ">[</code>n<code style="color:#806030; ">]</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            <code style="color:#806030; ">}</code>
-            ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;/code&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-            
-            <code style="color:#c34e00; ">/* Print a link to the MD5 version */</code>
-            ap_rputs<code style="color:#806030; ">(</code><code style="color:#800000; ">"</code><code style="color:#e60000; ">&lt;br/&gt;&lt;a href='?digest=md5'&gt;View the MD5 hash instead&lt;/a&gt;</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> r<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-        <code style="color:#806030; ">}</code>
-        apr_file_close<code style="color:#806030; ">(</code>file<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-        
-    <code style="color:#806030; ">}</code>
-    
-    
-    
-    <code style="color:#c34e00; ">/* Let the server know that we responded to this request. */</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> OK<code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-</pre>
-
-
-
-This version in its entirity can be found here: 
-<a href="http://people.apache.org/~humbedooh/mods/examples/mod_example_2.c">mod_example_2.c</a>.
-
-
-</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="section">
-<h2><a name="configuration" id="configuration">Adding configuration options</a></h2>
-<p>
-In this next segment of this document, we will turn our eyes away from the 
-digest module and create a new example module, whose only function is to 
-write out its own configuration. The purpose of this is to examine how 
-the server works with configuration, and what happens when you start writing 
-advanced configurations 
-for your modules.
-</p>
-<h3><a name="config_intro" id="config_intro">An introduction to configuration 
-directives</a></h3> If you are reading this, then you probably already know 
-what a configuration directive is. Simply put, a directive is a way of 
-telling an individual module (or a set of modules) how to behave, such as 
-these directives control how <code>mod_rewrite</code> works:
-<div class="example"><pre>
-RewriteEngine On
-RewriteCond %{REQUEST_URI} ^/foo/bar
-RewriteRule ^/foo/bar/(.*)$ /foobar?page=$1
-</pre></div>
-Each of these configuration directives are handled by a separate function, 
-that parses the parameters given and sets up a configuration accordingly.
-
-<h3><a name="config_simple" id="config_simple">Making an example configuration</a></h3>
-To begin with, we'll create a basic configuration in C-space:
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">typedef</code> <code style="color:#400000; font-weight:bold; ">struct</code> <code style="color:#806030; ">{</code>
-    <code style="color:#400000; font-weight:bold; ">int</code>         enabled<code style="color:#806030; ">;</code>      <code style="color:#c34e00; ">/* Enable or disable our module */</code>
-    <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code> <code style="color:#806030; ">*</code>path<code style="color:#806030; ">;</code>         <code style="color:#c34e00; ">/* Some path to...something */</code>
-    <code style="color:#400000; font-weight:bold; ">int</code>         typeOfAction<code style="color:#806030; ">;</code> <code style="color:#c34e00; ">/* 1 means action A, 2 means action B and so on */</code>
-<code style="color:#806030; ">}</code> example_config<code style="color:#806030; ">;</code>
-</pre>
-
-
-
-Now, let's put this into perspective by creating a very small module that 
-just prints out a hard-coded configuration. You'll notice that we use the 
-<code>register_hooks</code> function for initializing the configuration 
-values to their defaults:
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#400000; font-weight:bold; ">typedef</code> <code style="color:#400000; font-weight:bold; ">struct</code> <code style="color:#806030; ">{</code>
-    <code style="color:#400000; font-weight:bold; ">int</code>         enabled<code style="color:#806030; ">;</code>      <code style="color:#c34e00; ">/* Enable or disable our module */</code>
-    <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code> <code style="color:#806030; ">*</code>path<code style="color:#806030; ">;</code>         <code style="color:#c34e00; ">/* Some path to...something */</code>
-    <code style="color:#400000; font-weight:bold; ">int</code>         typeOfAction<code style="color:#806030; ">;</code> <code style="color:#c34e00; ">/* 1 means action A, 2 means action B and so on */</code>
-<code style="color:#806030; ">}</code> example_config<code style="color:#806030; ">;</code>
-
-<code style="color:#400000; font-weight:bold; ">static</code> example_config config<code style="color:#806030; ">;</code>
-
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">int</code> example_handler<code style="color:#806030; ">(</code>request_rec <code style="color:#806030; ">*</code>r<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#400000; font-weight:bold; ">if</code> <code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">handler</code> <code style="color:#806030; ">|</code><code style="color:#806030; ">|</code> <code style="color:#800040; ">strcmp</code><code style="color:#806030; ">(</code>r<code style="color:#806030; ">-</code><code style="color:#806030; ">&gt;</code><code style="color:#008833">handler</code><code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">example-handler</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">)</code> <code style="color:#400000; font-weight:bold; ">return</code><code style="color:#806030; ">(</code>DECLINED<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    ap_set_content_type<code style="color:#806030; ">(</code>r<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">text/plain</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    ap_rprintf<code style="color:#806030; ">(r, </code><code style="color:#800000; ">"</code><code style="color:#e60000; ">Enabled: </code><code style="color:#0f6900; ">%u</code><code style="color:#0f6900; ">\n</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> config<code style="color:#806030; ">.</code>enabled<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    ap_rprintf<code style="color:#806030; ">(r, </code><code style="color:#800000; ">"</code><code style="color:#e60000; ">Path: </code><code style="color:#0f6900; ">%s</code><code style="color:#0f6900; ">\n</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> config<code style="color:#806030; ">.</code>path<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    ap_rprintf<code style="color:#806030; ">(r, </code><code style="color:#800000; ">"</code><code style="color:#e60000; ">TypeOfAction: </code><code style="color:#0f6900; ">%x</code><code style="color:#0f6900; ">\n</code><code style="color:#800000; ">"</code><code style="color:#806030; ">,</code> config<code style="color:#806030; ">.</code>typeOfAction<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> OK<code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-
-<code style="color:#400000; font-weight:bold; ">static</code> <code style="color:#400000; font-weight:bold; ">void</code> register_hooks<code style="color:#806030; ">(</code>apr_pool_t <code style="color:#806030; ">*</code>pool<code style="color:#806030; ">)</code> 
-<code style="color:#806030; ">{</code>
-    config<code style="color:#806030; ">.</code>enabled <code style="color:#806030; ">=</code> <code style="color:#c00000; ">1</code><code style="color:#806030; ">;</code>
-    config<code style="color:#806030; ">.</code>path <code style="color:#806030; ">=</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">/foo/bar</code><code style="color:#800000; ">"</code><code style="color:#806030; ">;</code>
-    config<code style="color:#806030; ">.</code>typeOfAction <code style="color:#806030; ">=</code> <code style="color:#c00000; ">0x00</code><code style="color:#806030; ">;</code>
-    ap_hook_handler<code style="color:#806030; ">(</code>example_handler<code style="color:#806030; ">,</code> <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">,</code> <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">,</code> APR_HOOK_LAST<code style="color:#806030; ">)</code><code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-
-<code style="color:#c34e00; ">/* Define our module as an entity and assign a function for registering hooks  */</code>
-
-module AP_MODULE_DECLARE_DATA   example_module <code style="color:#806030; ">=</code>
-<code style="color:#806030; ">{</code>
-    STANDARD20_MODULE_STUFF<code style="color:#806030; ">,</code>
-    <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">,</code>            <code style="color:#c34e00; ">/* Per-directory configuration handler */</code>
-    <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">,</code>            <code style="color:#c34e00; ">/* Merge handler for per-directory configurations */</code>
-    <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">,</code>            <code style="color:#c34e00; ">/* Per-server configuration handler */</code>
-    <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">,</code>            <code style="color:#c34e00; ">/* Merge handler for per-server configurations */</code>
-    <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">,</code>            <code style="color:#c34e00; ">/* Any directives we may have for httpd */</code>
-    register_hooks   <code style="color:#c34e00; ">/* Our hook registering function */</code>
-<code style="color:#806030; ">}</code><code style="color:#806030; ">;</code>
-</pre>
-
-
-
-So far so good. To access our new handler, we could add the following to 
-our configuration:
-<div class="example"><pre>
-&lt;Location /example&gt;
-    SetHandler example-handler
-&lt;/Location&gt;
-</pre></div>
-When we visit, we'll see our current configuration being spit out by our 
-module. 
-
-
-<h3><a name="register_directive" id="register_directive">Registering directives with the server</a></h3>
-What if we want to change our configuration, not by hard-coding new values 
-into the module, but by using either the httpd.conf file or possibly a 
-.htaccess file? It's time to let the server know that we want this to be 
-possible. To do so, we must first change our <em>name tag</em> to include a 
-reference to the configuration directives we want to register with the server:
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-module AP_MODULE_DECLARE_DATA   example_module =
-{
-    STANDARD20_MODULE_STUFF,
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,               <code style="color:#c34e00; ">/* Per-directory configuration handler */</code>
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,               <code style="color:#c34e00; ">/* Merge handler for per-directory configurations */</code>
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,               <code style="color:#c34e00; ">/* Per-server configuration handler */</code>
-    <code style="color:#7f0055; font-weight:bold; ">NULL</code>,               <code style="color:#c34e00; ">/* Merge handler for per-server configurations */</code>
-    example_directives, <code style="color:#c34e00; ">/* Any directives we may have for httpd */</code>
-    register_hooks      <code style="color:#c34e00; ">/* Our hook registering function */</code>
-};
-</pre>
-
-
-
-This will tell the server that we are now accepting directives from the 
-configuration files, and that the structure called <code>example_directives
-</code> holds information on what our directives are and how they work. 
-Since we have three different variables in our module configuration, we 
-will add a structure with three directives and a NULL at the end:
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-static const command_rec        example_directives[] =
-{
-    <code style="color:#2e8800; "><a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__CONFIG.html#ga07c7d22ae17805e61204463326cf9c34">AP_INIT_TAKE1</a></code>("exampleEnabled", example_set_enabled, <code style="color:#7f0055; font-weight:bold; ">NULL</code>, RSRC_CONF, "Enable or disable mod_example"),
-    <code style="color:#2e8800; "><a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__CONFIG.html#ga07c7d22ae17805e61204463326cf9c34">AP_INIT_TAKE1</a></code>("examplePath", example_set_path, <code style="color:#7f0055; font-weight:bold; ">NULL</code>, RSRC_CONF, "The path to whatever"),
-    <code style="color:#2e8800; "><a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__CONFIG.html#gafaec43534fcf200f37d9fecbf9247c21">AP_INIT_TAKE2</a></code>("exampleAction", example_set_action, <code style="color:#7f0055; font-weight:bold; ">NULL</code>, RSRC_CONF, "Special action value!"),
-    { <code style="color:#7f0055; font-weight:bold; ">NULL</code> }
-};
-</pre>
-
-
-
-<img src="../images/build_a_mod_4.png" border="1" /><br />
-<p>
-As you can see, each directive needs at least 5 parameters set:
-<ol>
-<li><code><a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__CONFIG.html#ga07c7d22ae17805e61204463326cf9c34">AP_INIT_TAKE1</a></code>: This is a macro that tells the server that this directive takes one and only one argument. 
-If we required two arguments, we could use the macro <code><a href="http://ci.apache.org/projects/httpd/trunk/doxygen/group__APACHE__CORE__CONFIG.html#gafaec43534fcf200f37d9fecbf9247c21">AP_INIT_TAKE2</a></code> and so on (refer to httpd_conf.h 
-for more macros).</li>
-<li><code>exampleEnabled</code>: This is the name of our directive. More precisely, it is what the user must put in his/her 
-configuration in order to invoke a configuration change in our module.</li>
-<li><code>example_set_enabled</code>: This is a reference to a C function that parses the directive and sets the configuration 
-accordingly. We will discuss how to make this in the following paragraph.</li>
-<li><code>RSRC_CONF</code>: This tells the server where the directive is permitted. We'll go into details on this value in the 
-later chapters, but for now, <code>RSRC_CONF</code> means that the server will only accept these directives in a server context.</li>
-<li><code>"Enable or disable...."</code>: This is simply a brief description of what the directive does.</li>
-</ol>
-(<em>The "missing" parameter in our definition, which is usually set to 
-<code>NULL</code>, is an optional function that can be run after the 
-initial function to parse the arguments have been run. This is usually 
-omitted, as the function for verifying arguments might as well be used to 
-set them.</em>)
-</p>
-
-<h3><a name="directive_handler" id="directive_handler">The directive handler function</a></h3>
-<p>
-Now that we've told the server to expect some directives for our module, it's 
-time to make a few functions for handling these. What the server reads in the 
-configuration file(s) is text, and so naturally, what it passes along to 
-our directive handler is one or more strings, that we ourselves need to 
-recognize and act upon. You'll notice, that since we set our <code>
-exampleAction</code> directive to accept two arguments, its C function also 
-has an additional parameter defined:<br /> 
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#c34e00; ">/* Handler for the "exambleEnabled" directive */</code>
-<code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code><code style="color:#806030; "> *</code>example_set_enabled<code style="color:#806030; ">(</code>cmd_parms <code style="color:#806030; ">*</code>cmd<code style="color:#806030; ">,</code> <code style="color:#400000; font-weight:bold; ">void</code> <code style="color:#806030; ">*</code>cfg<code style="color:#806030; ">,</code> <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code> <code style="color:#806030; ">*</code>arg<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#400000; font-weight:bold; ">if</code><code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>strcasecmp<code style="color:#806030; ">(</code>arg<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">on</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">)</code> config<code style="color:#806030; ">.</code>enabled <code style="color:#806030; ">=</code> <code style="color:#c00000; ">1</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">else</code> config<code style="color:#806030; ">.</code>enabled <code style="color:#806030; ">=</code> <code style="color:#c00000; ">0</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-
-<code style="color:#c34e00; ">/* Handler for the "examplePath" directive */</code>
-<code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code><code style="color:#806030; "> *</code>example_set_path<code style="color:#806030; ">(</code>cmd_parms <code style="color:#806030; ">*</code>cmd<code style="color:#806030; ">,</code> <code style="color:#400000; font-weight:bold; ">void</code> <code style="color:#806030; ">*</code>cfg<code style="color:#806030; ">,</code> <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code> <code style="color:#806030; ">*</code>arg<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    config<code style="color:#806030; ">.</code>path <code style="color:#806030; ">=</code> arg<code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-
-<code style="color:#c34e00; ">/* Handler for the "exampleAction" directive */</code>
-<code style="color:#c34e00; ">/* Let's pretend this one takes one argument (file or db), and a second (deny or allow), */</code>
-<code style="color:#c34e00; ">/* and we store it in a bit-wise manner. */</code>
-<code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code><code style="color:#806030; "> *</code>example_set_action<code style="color:#806030; ">(</code>cmd_parms <code style="color:#806030; ">*</code>cmd<code style="color:#806030; ">,</code> <code style="color:#400000; font-weight:bold; ">void</code> <code style="color:#806030; ">*</code>cfg<code style="color:#806030; ">,</code> <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code> <code style="color:#806030; ">*</code>arg1<code style="color:#806030; ">,</code> <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code><code style="color:#806030; ">*</code> arg2<code style="color:#806030; ">)</code>
-<code style="color:#806030; ">{</code>
-    <code style="color:#400000; font-weight:bold; ">if</code><code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>strcasecmp<code style="color:#806030; ">(</code>arg1<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">file</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">)</code> config<code style="color:#806030; ">.</code>typeOfAction <code style="color:#806030; ">=</code> <code style="color:#c00000; ">0x01</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">else</code> config<code style="color:#806030; ">.</code>typeOfAction <code style="color:#806030; ">=</code> <code style="color:#c00000; ">0x02</code><code style="color:#806030; ">;</code>
-    
-    <code style="color:#400000; font-weight:bold; ">if</code><code style="color:#806030; ">(</code><code style="color:#806030; ">!</code>strcasecmp<code style="color:#806030; ">(</code>arg2<code style="color:#806030; ">,</code> <code style="color:#800000; ">"</code><code style="color:#e60000; ">deny</code><code style="color:#800000; ">"</code><code style="color:#806030; ">)</code><code style="color:#806030; ">)</code> config<code style="color:#806030; ">.</code>typeOfAction <code style="color:#806030; ">+</code><code style="color:#806030; ">=</code> <code style="color:#c00000; ">0x10</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">else</code> config<code style="color:#806030; ">.</code>typeOfAction <code style="color:#806030; ">+</code><code style="color:#806030; ">=</code> <code style="color:#c00000; ">0x20</code><code style="color:#806030; ">;</code>
-    <code style="color:#400000; font-weight:bold; ">return</code> <code style="color:#007d45; ">NULL</code><code style="color:#806030; ">;</code>
-<code style="color:#806030; ">}</code>
-</pre>
-
-
-
-</p>
-
-<h3><a name="directive_complete" id="directive_complete">Putting it all together</a></h3>
-<p>
-Now that we have our directives set up, and handlers configured for them, 
-we can assemble our module into one big file:
-
-
-
-<pre style="color:#000000;background:#ffffef;border: 1px dashed #333; padding: 0.5em; margin: 1em 2em 1em 1em;">
-<code style="color:#c34e00; ">/* mod_example_config_simple.c: */</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">&lt;</code><code style="color:#40015a; ">stdio.h</code><code style="color:#800000; ">&gt;</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">apr_hash.h</code><code style="color:#800000; ">"</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">ap_config.h</code><code style="color:#800000; ">"</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">ap_provider.h</code><code style="color:#800000; ">"</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">httpd.h</code><code style="color:#800000; ">"</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">http_core.h</code><code style="color:#800000; ">"</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">http_config.h</code><code style="color:#800000; ">"</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">http_log.h</code><code style="color:#800000; ">"</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">http_protocol.h</code><code style="color:#800000; ">"</code>
-<code style="color:#004a43; ">#</code><code style="color:#004a43; ">include </code><code style="color:#800000; ">"</code><code style="color:#40015a; ">http_request.h</code><code style="color:#800000; ">"</code>
-
-<code style="color:#c34e00; ">/*</code>
-<code style="color:#c34e00; ">&nbsp;==============================================================================</code>
-<code style="color:#c34e00; ">&nbsp;Our configuration prototype and declaration:</code>
-<code style="color:#c34e00; ">&nbsp;==============================================================================</code>
-<code style="color:#c34e00; ">&nbsp;*/</code>
-<code style="color:#400000; font-weight:bold; ">typedef</code> <code style="color:#400000; font-weight:bold; ">struct</code> <code style="color:#806030; ">{</code>
-    <code style="color:#400000; font-weight:bold; ">int</code>         enabled<code style="color:#806030; ">;</code>      <code style="color:#c34e00; ">/* Enable or disable our module */</code>
-    <code style="color:#400000; font-weight:bold; ">const</code> <code style="color:#400000; font-weight:bold; ">char</code> <code style="color:#806030; ">*</code>path<code style="color:#806030; ">;</code>         <code style="color:#c34e00; ">/* Some path to...something */</code>
-    <code style="color:#400000; font-weight:bold; ">int</code>         typeOfAction<code style="color:#806030; ">;</code> <code style="color:#c34e00; ">/* 1 means action A, 2 means action B and so on */</code>

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