<title>Configuration Files - Apache HTTP Server</title>
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-<p class="apache">Apache HTTP Server Version 2.3</p>
+<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 2.5</p>
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-<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="./">Version 2.3</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>
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<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> |
<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><ul class="seealso"><li><a href="#comments_section">Comments</a></li></ul></div>
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<h2><a name="main" id="main">Main Configuration Files</a></h2>
and white space occurring before a directive are ignored, so
you may indent directives for clarity.</p>
- <p>The values of shell environment variables can be used in
- configuration file lines using the syntax <code>${ENVVAR}</code>.
- If "ENVVAR" is the name of a valid environment variable, the value
- of that variable is substituted into that spot in the
- configuration file line, and processing continues as if that text
- were found directly in the configuration file. (If the ENVVAR
- variable is not found, the characters "${ENVVAR}" are left
- unchanged for use by later stages in the config file
- processing.)</p>
-
- <p>Only environment variables defined before the server is started
- can be used in expansions. 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 the configuration file, after
- environment-variable substitution, joining any continued lines and
- removing leading and trailing white space, is 8192 characters.</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.xml#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>
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<h2><a name="modules" id="modules">Modules</a></h2>
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+</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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