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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
- "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
-
-<html xmlns="http://www.w3.org/1999/xhtml">
- <head>
- <meta name="generator" content="HTML Tidy, see www.w3.org" />
-
- <title>Definitions of terms used to describe Apache
- directives</title>
- </head>
- <!-- Background white, links blue (unvisited), navy (visited), red (active) -->
-
- <body bgcolor="#FFFFFF" text="#000000" link="#0000FF"
- vlink="#000080" alink="#FF0000">
- <!--#include virtual="header.html" -->
-
- <h1 align="CENTER">Terms Used to Describe Apache
- Directives</h1>
-
- <p>Each Apache configuration directive is described using a
- common format that looks like this:</p>
-
- <dl>
- <dd><a href="#Syntax" rel="Help"><strong>Syntax:</strong></a>
- <em>directive-name</em> <em>some args</em><br />
- <a href="#Default" rel="Help"><strong>Default:</strong></a>
- <samp><em>directive-name default-value</em></samp><br />
- <a href="#Context" rel="Help"><strong>Context:</strong></a>
- <em>context-list</em><br />
- <a href="#Override"
- rel="Help"><strong>Override:</strong></a>
- <em>override</em><br />
- <a href="#Status" rel="Help"><strong>Status:</strong></a>
- <em>status</em><br />
- <a href="#Module" rel="Help"><strong>Module:</strong></a>
- <em>module-name</em><br />
- <a href="#Compatibility"
- rel="Help"><strong>Compatibility:</strong></a>
- <em>compatibility notes</em><br />
- <a href="#Deprecated"
- rel="Help"><strong>Deprecated:</strong></a> <em>see
- other</em></dd>
- </dl>
-
- <p>Each of the directive's attributes, complete with possible
- values where possible, are described in this document.</p>
-
- <h2>Directive Terms</h2>
-
- <ul>
- <li><a href="#Syntax">Syntax</a></li>
-
- <li><a href="#Default">Default</a></li>
-
- <li><a href="#Context">Context</a></li>
-
- <li><a href="#Override">Override</a></li>
-
- <li><a href="#Status">Status</a></li>
-
- <li><a href="#Module">Module</a></li>
-
- <li><a href="#Compatibility">Compatibility</a></li>
-
- <li><a href="#Deprecated">Deprecated</a></li>
- </ul>
- <hr />
-
- <h2><a id="Syntax" name="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 regular expression, which is a way of describing a
- pattern to match in text. 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>
- <hr />
-
- <h2><a id="Default" name="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>
- <hr />
-
- <h2><a id="Context" name="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><strong>server config</strong></dt>
-
- <dd>This means that the directive may be used in the server
- configuration files (<em>e.g.</em>, <samp>httpd.conf</samp>,
- <samp>srm.conf</samp>, and <samp>access.conf</samp>), but
- <strong>not</strong> within any
- <samp>&lt;VirtualHost&gt;</samp> or &lt;Directory&gt;
- containers. It is not allowed in <samp>.htaccess</samp> files
- at all.</dd>
-
- <dt><strong>virtual host</strong></dt>
-
- <dd>This context means that the directive may appear inside
- <samp>&lt;VirtualHost&gt;</samp> containers in the server
- configuration files.</dd>
-
- <dt><strong>directory</strong></dt>
-
- <dd>A directive marked as being valid in this context may be
- used inside <samp>&lt;Directory&gt;</samp>,
- <samp>&lt;Location&gt;</samp>, and <samp>&lt;Files&gt;</samp>
- containers in the server configuration files, subject to the
- restrictions outlined in <a href="../sections.html">How
- Directory, Location and Files sections work</a>.</dd>
-
- <dt><strong>.htaccess</strong></dt>
-
- <dd>If a directive is valid in this context, it means that it
- can appear inside <em>per</em>-directory
- <samp>.htaccess</samp> files. It may not be processed, though
- depending upon the <a href="#Override"
- rel="Help">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
- "<samp>server config, .htaccess</samp>" can be used in the
- <samp>httpd.conf</samp> file and in <samp>.htaccess</samp>
- files, but not within any &lt;Directory&gt; or
- &lt;VirtualHost&gt; containers.</p>
- <hr />
-
- <h2><a id="Override" name="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 <samp>.htaccess</samp> file. If
- the directive's <a href="#Context" rel="Help">context</a>
- doesn't permit it to appear in <samp>.htaccess</samp> files,
- this attribute should say "<em>Not applicable</em>".</p>
-
- <p>Overrides are activated by the <a
- href="core.html#allowoverride"
- rel="Help"><samp>AllowOverride</samp></a> directive, and apply
- to a particular scope (such as a directory) and all
- descendants, unless further modified by other
- <samp>AllowOverride</samp> directives at lower levels. The
- documentation for that directive also lists the possible
- override names available.</p>
- <hr />
-
- <h2><a id="Status" name="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><strong>Core</strong></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><strong>MPM</strong></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><strong>Base</strong></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><strong>Extension</strong></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><strong>Experimental</strong></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>
- <hr />
-
- <h2><a id="Module" name="Module">Module</a></h2>
-
- <p>This quite simply lists the name of the source module which
- defines the directive.</p>
- <hr />
-
- <h2><a id="Compatibility"
- name="Compatibility">Compatibility</a></h2>
-
- <p>If the directive wasn't part of the original Apache version
- 1 distribution, the version in which it was introduced should
- be listed here. If the directive has the same name as one from
- the NCSA HTTPd server, any inconsistencies in behavior between
- the two should also be mentioned. Otherwise, this attribute
- should say "<em>No compatibility issues.</em>"</p>
- <hr />
-
- <h2><a id="Deprecated" name="Deprecated">Deprecated</a></h2>
-
- <p>If this directive is eliminated since the Apache version 1
- distribution, the directive or option that replaces the
- behavior should be cited here. In general, directives,
- features, and options are only deprecated to minimize debugging
- of conflicting features, or if the feature can only continue to
- be supported in an alternate manner.</p>
- <!--#include virtual="footer.html" -->
- </body>
-</html>
-