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-<title>Configuration Files - Apache HTTP Server</title>
+<title>Configuration Files - Apache HTTP Server Version 2.5</title>
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-<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/
directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p>
-<p class="apache">Apache HTTP Server Version 2.3</p>
-<img alt="" src="./images/feather.gif" /></div>
+<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/
quickreference.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 2.5</p>
+<img alt="" src="./images/feather.png" /></div>
<div class="up"><a href="./"><img title="<-" alt="<-" src="./images/left.gif" /></a></div>
<div id="path">
-<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.
3</a></div><div id="page-content"><div id="preamble"><h1>Configuration Files</h1>
+<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.
5</a></div><div id="page-content"><div id="preamble"><h1>Configuration Files</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="./de/configuring.html" hreflang="de" rel="alternate" title="Deutsch"> de </a> |
<a href="./en/configuring.html" title="English"> en </a> |
<a href="./tr/configuring.html" hreflang="tr" rel="alternate" title="Türkçe"> tr </a></p>
</div>
-<p>This document describes the files used to configure the Apache
-HTTP server.</p>
+<p>This document describes the files used to configure Apache HTTP
+Server.</p>
</div>
<div id="quickview"><ul id="toc"><li><img alt="" src="./images/down.gif" /> <a href="#main">Main Configuration Files</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#syntax">Syntax of the Configuration Files</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#modules">Modules</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#scope">Scope of Directives</a></li>
<li><img alt="" src="./images/down.gif" /> <a href="#htaccess">.htaccess Files</a></li>
-</ul></div>
+</ul><h3>See also</h3><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
<div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
-<h2><a name="main" id="main">Main Configuration Files</a></h2>
+<h2><a name="main" id="main">Main Configuration Files</a> <a title="Permanent link" href="#main" class="permalink">¶</a></h2>
<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_mime.html">mod_mime</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/core.html#ifdefine"><IfDefine></a></code></li><li><code class="directive"><a href="./mod/core.html#include">Include</a></code></li><li><code class="directive"><a href="./mod/mod_mime.html#typesconfig">TypesConfig</a></code></li></ul></td></tr></table>
- <p>Apache is configured by placing <a href="mod/directives.html">directives</a> in plain text
+ <p>Apache
HTTP Server is configured by placing <a href="mod/directives.html">directives</a> in plain text
configuration files. The main configuration file is usually called
<code>httpd.conf</code>. The location of this file is set at
compile-time, but may be overridden with the <code>-f</code>
added using the <code class="directive"><a href="./mod/core.html#include">Include</a></code>
directive, and wildcards can be used to include many configuration
files. Any directive may be placed in any of these configuration
- files. Changes to the main configuration files are only
- recognized by Apache when it is started or restarted.</p>
+ files. Changes to the main configuration files are only
+ recognized by httpd when it is started or restarted.</p>
<p>The server also reads a file containing mime document types;
the filename is set by the <code class="directive"><a href="./mod/mod_mime.html#typesconfig">TypesConfig</a></code> directive,
and is <code>mime.types</code> by default.</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 of the Configuration Files</a></h2>
+<h2><a name="syntax" id="syntax">Syntax of the Configuration Files</a> <a title="Permanent link" href="#syntax" class="permalink">¶</a></h2>
- <p>Apache configuration files contain one directive per line.
- The back-slash "\" may be used as the last character on a line
+ <p>httpd configuration files contain one directive per line.
+ The backslash "\" may be used as the last character on a line
to indicate that the directive continues onto the next line.
There must be no other characters or white space between the
- back-slash and the end of the line.</p>
+ backslash and the end of the line.</p>
+
+ <p>Arguments to directives are separated by whitespace. If an
+ argument contains spaces, you must enclose that argument in quotes.</p>
<p>Directives in the configuration files are case-insensitive,
but arguments to directives are often case sensitive. Lines
that begin with the hash character "#" are considered
comments, and are ignored. Comments may <strong>not</strong> be
- included on a line after a configuration directive. Blank lines
- and white space occurring before a directive are ignored, so
- you may indent directives for clarity.</p>
+ included on the same line as a configuration directive.
+ White space occurring before a directive is ignored, so
+ you may indent directives for clarity. Blank lines are also ignored.</p>
+
+ <p>The values of variables defined with the <code class="directive"><a href="./mod/core.html#define">Define</a></code> of or shell environment variables can
+ be used in configuration file lines using the syntax <code>${VAR}</code>.
+ If "VAR" is the name of a valid variable, the value of that variable is
+ substituted into that spot in the configuration file line, and processing
+ continues as if that text were found directly in the configuration file.
+ Variables defined with <code class="directive"><a href="./mod/core.html#define">Define</a></code> take
+ precedence over shell environment variables.
+ If the "VAR" variable is not found, the characters <code>${VAR}</code>
+ are left unchanged, and a warning is logged.
+ Variable names may not contain colon ":" characters, to avoid clashes with
+ <code class="directive"><a href="./mod/mod_rewrite.html#rewritemap">RewriteMap</a></code>'s syntax.</p>
+
+ <p>Only shell environment variables defined before the server is started
+ can be used in expansions. Environment variables defined in the
+ configuration file itself, for example with <code class="directive"><a href="./mod/mod_env.html#setenv">SetEnv</a></code>, take effect too late to be used for
+ expansions in the configuration file.</p>
+
+ <p>The maximum length of a line in normal configuration files, after
+ variable substitution and joining any continued lines, is approximately
+ 16 MiB. In <a href="configuring.html#htaccess">.htaccess files</a>, the
+ maximum length is 8190 characters.</p>
<p>You can check your configuration files for syntax errors
without starting the server by using <code>apachectl
configtest</code> or the <code>-t</code> command line
option.</p>
+
+ <p>You can use <code class="module"><a href="./mod/mod_info.html">mod_info</a></code>'s <code>-DDUMP_CONFIG</code> to
+ dump the configuration with all included files and environment
+ variables resolved and all comments and non-matching
+ <code class="directive"><a href="./mod/core.html#ifdefine"><IfDefine></a></code> and
+ <code class="directive"><a href="./mod/core.html#ifmodule"><IfModule></a></code> sections
+ removed. However, the output does not reflect the merging or overriding
+ that may happen for repeated directives.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
-<h2><a name="modules" id="modules">Modules</a></h2>
+<h2><a name="modules" id="modules">Modules</a> <a title="Permanent link" href="#modules" class="permalink">¶</a></h2>
<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="./mod/mod_so.html">mod_so</a></code></li></ul></td><td><ul><li><code class="directive"><a href="./mod/core.html#ifmodule"><IfModule></a></code></li><li><code class="directive"><a href="./mod/mod_so.html#loadmodule">LoadModule</a></code></li></ul></td></tr></table>
- <p>Apache is a modular server. This implies that only the most
+ <p>httpd is a modular server. This implies that only the most
basic functionality is included in the core server. Extended
features are available through <a href="mod/">modules</a> which can be loaded
- into
Apache. By default, a <a href="mod/module-dict.html#Status">base</a> set of modules is
+ into
httpd. By default, a <a href="mod/module-dict.html#Status">base</a> set of modules is
included in the server at compile-time. If the server is
compiled to use <a href="dso.html">dynamically loaded</a>
modules, then modules can be compiled separately and added at
any time using the <code class="directive"><a href="./mod/mod_so.html#loadmodule">LoadModule</a></code>
directive.
- Otherwise, Apache must be recompiled to add or remove modules.
+ Otherwise, httpd must be recompiled to add or remove modules.
Configuration directives may be included conditional on a
- presence of a particular module by enclosing them in an <code class="directive"><a href="./mod/core.html#ifmodule"><IfModule></a></code> block.</p>
+ presence of a particular module by enclosing them in an <code class="directive"><a href="./mod/core.html#ifmodule"><IfModule></a></code> block. However,
+ <code class="directive"><IfModule></code> blocks are not
+ required, and in some cases may mask the fact that you're missing an
+ important module.</p>
<p>To see which modules are currently compiled into the server,
- you can use the <code>-l</code> command line option.</p>
+ you can use the <code>-l</code> command line option. You can also
+ see what modules are loaded dynamically using the <code>-M</code>
+ command line option.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
-<h2><a name="scope" id="scope">Scope of Directives</a></h2>
+<h2><a name="scope" id="scope">Scope of Directives</a> <a title="Permanent link" href="#scope" class="permalink">¶</a></h2>
<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td /><td><ul><li><code class="directive"><a href="./mod/core.html#directory"><Directory></a></code></li><li><code class="directive"><a href="./mod/core.html#directorymatch"><DirectoryMatch></a></code></li><li><code class="directive"><a href="./mod/core.html#files"><Files></a></code></li><li><code class="directive"><a href="./mod/core.html#filesmatch"><FilesMatch></a></code></li><li><code class="directive"><a href="./mod/core.html#location"><Location></a></code></li><li><code class="directive"><a href="./mod/core.html#locationmatch"><LocationMatch></a></code></li><li><code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code></li></ul></td></tr></table>
locations or URLs. They can also be nested, allowing for very
fine grained configuration.</p>
- <p>Apache has the capability to serve many different websites
+ <p>httpd has the capability to serve many different websites
simultaneously. This is called <a href="vhosts/">Virtual
Hosting</a>. Directives can also be scoped by placing them
inside <code class="directive"><a href="./mod/core.html#virtualhost"><VirtualHost></a></code>
work</a>.</p>
</div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
-<h2><a name="htaccess" id="htaccess">.htaccess Files</a></h2>
+<h2><a name="htaccess" id="htaccess">.htaccess Files</a> <a title="Permanent link" href="#htaccess" class="permalink">¶</a></h2>
<table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td /><td><ul><li><code class="directive"><a href="./mod/core.html#accessfilename">AccessFileName</a></code></li><li><code class="directive"><a href="./mod/core.html#allowoverride">AllowOverride</a></code></li></ul></td></tr></table>
- <p>Apache allows for decentralized management of configuration
+ <p>httpd allows for decentralized management of configuration
via special files placed inside the web tree. The special files
are usually called <code>.htaccess</code>, but any name can be
specified in the <code class="directive"><a href="./mod/core.html#accessfilename">AccessFileName</a></code>
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-</div><div id="footer">
-<p class="apache">Copyright 2008 The Apache Software Foundation.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
-<p class="menu"><a href="./mod/">Modules</a> | <a href="./mod/directives.html">Directives</a> | <a href="./faq/">FAQ</a> | <a href="./glossary.html">Glossary</a> | <a href="./sitemap.html">Sitemap</a></p></div>
+</div><div class="top"><a href="#page-header"><img src="./images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed again by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Freenode, or sent to our <a href="http://httpd.apache.org/lists.html">mailing lists</a>.</div>
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