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+<title>Terms Used to Describe Directives - Apache HTTP Server Version 2.4</title>
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+<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="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 2.4</p>
+<img alt="" src="../images/feather.png" /></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></div><div id="page-content"><div id="preamble"><h1>Terms Used to Describe Directives</h1>
+<div class="toplang">
+<p><span>Available Languages: </span><a href="../en/mod/directive-dict.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../es/mod/directive-dict.html" hreflang="es" rel="alternate" title="Español">&nbsp;es&nbsp;</a> |
+<a href="../fr/mod/directive-dict.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ja/mod/directive-dict.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="../ko/mod/directive-dict.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="../tr/mod/directive-dict.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</a></p>
+</div>
+
+ <p>This document describes the terms that are used to describe
+ each Apache <a href="directives.html">configuration
+ directive</a>.</p>
+</div>
+<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#Description">Description</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#Syntax">Syntax</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#Default">Default</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#Context">Context</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#Override">Override</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#Status">Status</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#Module">Module</a></li>
+<li><img alt="" src="../images/down.gif" /> <a href="#Compatibility">Compatibility</a></li>
+</ul><h3>See also</h3><ul class="seealso"><li><a href="../configuring.html">Configuration files</a></li><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="Description" id="Description">Description</a></h2>
+
+<p>A brief description of the purpose of the directive.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="Syntax" id="Syntax">Syntax</a></h2>
+
+ <p>This indicates the format of the directive as it would
+ appear in a configuration file. This syntax is extremely
+ directive-specific, and is described in detail in the
+ directive's definition. Generally, the directive name is
+ followed by a series of one or more space-separated arguments.
+ If an argument contains a space, the argument must be enclosed
+ in double quotes. Optional arguments are enclosed in square
+ brackets. Where an argument can take on more than one possible
+ value, the possible values are separated by vertical bars "|".
+ Literal text is presented in the default font, while
+ argument-types for which substitution is necessary are
+ <em>emphasized</em>. Directives which can take a variable
+ number of arguments will end in "..." indicating that the last
+ argument is repeated.</p>
+
+ <p>Directives use a great number of different argument types. A
+ few common ones are defined below.</p>
+
+ <dl>
+ <dt><em>URL</em></dt>
+
+ <dd>A complete Uniform Resource Locator including a scheme,
+ hostname, and optional pathname as in
+ <code>http://www.example.com/path/to/file.html</code></dd>
+
+ <dt><em>URL-path</em></dt>
+
+ <dd>The part of a <em>url</em> which follows the scheme and
+ hostname as in <code>/path/to/file.html</code>. The
+ <em>url-path</em> represents a web-view of a resource, as
+ opposed to a file-system view.</dd>
+
+ <dt><em>file-path</em></dt>
+
+ <dd>The path to a file in the local file-system beginning
+ with the root directory as in
+ <code>/usr/local/apache/htdocs/path/to/file.html</code>.
+ Unless otherwise specified, a <em>file-path</em> which does
+ not begin with a slash will be treated as relative to the <a href="core.html#serverroot">ServerRoot</a>.</dd>
+
+ <dt><em>directory-path</em></dt>
+
+ <dd>The path to a directory in the local file-system
+ beginning with the root directory as in
+ <code>/usr/local/apache/htdocs/path/to/</code>.</dd>
+
+ <dt><em>filename</em></dt>
+
+ <dd>The name of a file with no accompanying path information
+ as in <code>file.html</code>.</dd>
+
+ <dt><em>regex</em></dt>
+
+ <dd>A Perl-compatible <a class="glossarylink" href="../glossary.html#regex" title="see glossary">regular
+ expression</a>. The directive definition will specify what the
+ <em>regex</em> is matching against.</dd>
+
+ <dt><em>extension</em></dt>
+
+ <dd>In general, this is the part of the <em>filename</em>
+ which follows the last dot. However, Apache recognizes
+ multiple filename extensions, so if a <em>filename</em>
+ contains more than one dot, each dot-separated part of the
+ filename following the first dot is an <em>extension</em>.
+ For example, the <em>filename</em> <code>file.html.en</code>
+ contains two extensions: <code>.html</code> and
+ <code>.en</code>. For Apache directives, you may specify
+ <em>extension</em>s with or without the leading dot. In
+ addition, <em>extension</em>s are not case sensitive.</dd>
+
+ <dt><em>MIME-type</em></dt>
+
+ <dd>A method of describing the format of a file which
+ consists of a major format type and a minor format type,
+ separated by a slash as in <code>text/html</code>.</dd>
+
+ <dt><em>env-variable</em></dt>
+
+ <dd>The name of an <a href="../env.html">environment
+ variable</a> defined in the Apache configuration process.
+ Note this is not necessarily the same as an operating system
+ environment variable. See the <a href="../env.html">environment variable documentation</a> for
+ more details.</dd>
+ </dl>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="Default" id="Default">Default</a></h2>
+
+ <p>If the directive has a default value (<em>i.e.</em>, if you
+ omit it from your configuration entirely, the Apache Web server
+ will behave as though you set it to a particular value), it is
+ described here. If there is no default value, this section
+ should say "<em>None</em>". Note that the default listed here
+ is not necessarily the same as the value the directive takes in
+ the default httpd.conf distributed with the server.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="Context" id="Context">Context</a></h2>
+
+ <p>This indicates where in the server's configuration files the
+ directive is legal. It's a comma-separated list of one or more
+ of the following values:</p>
+
+ <dl>
+ <dt>server config</dt>
+
+ <dd>This means that the directive may be used in the server
+ configuration files (<em>e.g.</em>, <code>httpd.conf</code>), but
+ <strong>not</strong> within any
+ <code class="directive"><a href="../mod/core.html#virtualhost">&lt;VirtualHost&gt;</a></code>
+ or <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code>
+ containers. It is not allowed in <code>.htaccess</code> files
+ at all.</dd>
+
+ <dt>virtual host</dt>
+
+ <dd>This context means that the directive may appear inside
+ <code class="directive"><a href="../mod/core.html#virtualhost">&lt;VirtualHost&gt;</a></code>
+ containers in the server
+ configuration files.</dd>
+
+ <dt>directory</dt>
+
+ <dd>A directive marked as being valid in this context may be
+ used inside <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code>, <code class="directive"><a href="../mod/core.html#location">&lt;Location&gt;</a></code>, <code class="directive"><a href="../mod/core.html#files">&lt;Files&gt;</a></code>, <code class="directive"><a href="../mod/core.html#if">&lt;If&gt;</a></code>, and <code class="directive"><a href="../mod/mod_proxy.html#proxy">&lt;Proxy&gt;</a></code> containers
+ in the server configuration files, subject to the restrictions
+ outlined in <a href="../sections.html">Configuration
+ Sections</a>.</dd>
+
+ <dt>.htaccess</dt>
+
+ <dd>If a directive is valid in this context, it means that it
+ can appear inside <em>per</em>-directory
+ <code>.htaccess</code> files. It may not be processed, though
+ depending upon the <a href="#Override">overrides</a> currently active.</dd>
+ </dl>
+
+ <p>The directive is <em>only</em> allowed within the designated
+ context; if you try to use it elsewhere, you'll get a
+ configuration error that will either prevent the server from
+ handling requests in that context correctly, or will keep the
+ server from operating at all -- <em>i.e.</em>, the server won't
+ even start.</p>
+
+ <p>The valid locations for the directive are actually the
+ result of a Boolean OR of all of the listed contexts. In other
+ words, a directive that is marked as being valid in
+ "<code>server config, .htaccess</code>" can be used in the
+ <code>httpd.conf</code> file and in <code>.htaccess</code>
+ files, but not within any <code class="directive"><a href="../mod/core.html#directory">&lt;Directory&gt;</a></code> or
+ <code class="directive"><a href="../mod/core.html#virtualhost">&lt;VirtualHost&gt;</a></code>
+ containers.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="Override" id="Override">Override</a></h2>
+
+ <p>This directive attribute indicates which configuration
+ override must be active in order for the directive to be
+ processed when it appears in a <code>.htaccess</code> file. If
+ the directive's <a href="#Context">context</a>
+ doesn't permit it to appear in <code>.htaccess</code> files,
+ then no context will be listed.</p>
+
+ <p>Overrides are activated by the <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> directive, and apply
+ to a particular scope (such as a directory) and all
+ descendants, unless further modified by other
+ <code class="directive"><a href="../mod/core.html#allowoverride">AllowOverride</a></code> directives at
+ lower levels. The documentation for that directive also lists the
+ possible override names available.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="Status" id="Status">Status</a></h2>
+
+ <p>This indicates how tightly bound into the Apache Web server
+ the directive is; in other words, you may need to recompile the
+ server with an enhanced set of modules in order to gain access
+ to the directive and its functionality. Possible values for
+ this attribute are:</p>
+
+ <dl>
+ <dt>Core</dt>
+
+ <dd>If a directive is listed as having "Core" status, that
+ means it is part of the innermost portions of the Apache Web
+ server, and is always available.</dd>
+
+ <dt>MPM</dt>
+
+ <dd>A directive labeled as having "MPM" status is provided by
+ a <a href="../mpm.html">Multi-Processing Module</a>. This
+ type of directive will be available if and only if you are
+ using one of the MPMs listed on the <a href="#Module">Module</a> line of the directive
+ definition.</dd>
+
+ <dt>Base</dt>
+
+ <dd>A directive labeled as having "Base" status is supported
+ by one of the standard Apache modules which is compiled into
+ the server by default, and is therefore normally available
+ unless you've taken steps to remove the module from your
+ configuration.</dd>
+
+ <dt>Extension</dt>
+
+ <dd>A directive with "Extension" status is provided by one of
+ the modules included with the Apache server kit, but the
+ module isn't normally compiled into the server. To enable the
+ directive and its functionality, you will need to change the
+ server build configuration files and re-compile Apache.</dd>
+
+ <dt>Experimental</dt>
+
+ <dd>"Experimental" status indicates that the directive is
+ available as part of the Apache kit, but you're on your own
+ if you try to use it. The directive is being documented for
+ completeness, and is not necessarily supported. The module
+ which provides the directive may or may not be compiled in by
+ default; check the top of the page which describes the
+ directive and its module to see if it remarks on the
+ availability.</dd>
+ </dl>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="Module" id="Module">Module</a></h2>
+
+ <p>This quite simply lists the name of the source module which
+ defines the directive.</p>
+</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
+<div class="section">
+<h2><a name="Compatibility" id="Compatibility">Compatibility</a></h2>
+
+ <p>If the directive wasn't part of the original Apache version
+ 2 distribution, the version in which it was introduced should
+ be listed here. In addition, if the directive is available
+ only on certain platforms, it will be noted here.</p>
+</div></div>
+<div class="bottomlang">
+<p><span>Available Languages: </span><a href="../en/mod/directive-dict.html" title="English">&nbsp;en&nbsp;</a> |
+<a href="../es/mod/directive-dict.html" hreflang="es" rel="alternate" title="Español">&nbsp;es&nbsp;</a> |
+<a href="../fr/mod/directive-dict.html" hreflang="fr" rel="alternate" title="Français">&nbsp;fr&nbsp;</a> |
+<a href="../ja/mod/directive-dict.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
+<a href="../ko/mod/directive-dict.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a> |
+<a href="../tr/mod/directive-dict.html" hreflang="tr" rel="alternate" title="Türkçe">&nbsp;tr&nbsp;</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&amp;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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