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<?xml version="1.0"?>
<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">
<?xml-stylesheet type="text/xsl" href="../style/manual.en.xsl"?>
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<modulesynopsis metafile="mod_version.xml.meta">
<name>mod_version</name>
<description>Version dependent configuration</description>
<status>Extension</status>
<sourcefile>mod_version.c</sourcefile>
<identifier>version_module</identifier>
<summary>
<p>This module is designed for the use in test suites and large
networks which have to deal with different httpd versions and
different configurations. It provides a new container -- <directive
type="section" module="mod_version">IfVersion</directive>, which
allows a flexible version checking including numeric comparisons and
regular expressions.</p>
<example><title>Examples</title>
<highlight language="config">
<IfVersion 2.4.2>
# current httpd version is exactly 2.4.2
</IfVersion>
<IfVersion >= 2.5>
# use really new features :-)
</IfVersion>
</highlight>
</example>
<p>See below for further possibilities.</p>
</summary>
<directivesynopsis type="section">
<name>IfVersion</name>
<description>contains version dependent configuration</description>
<syntax><IfVersion [[!]<var>operator</var>] <var>version</var>> ...
</IfVersion></syntax>
<contextlist><context>server config</context><context>virtual host</context>
<context>directory</context><context>.htaccess</context></contextlist>
<override>All</override>
<usage>
<p>The <directive type="section">IfVersion</directive> section encloses
configuration directives which are executed only if the
<program>httpd</program> version
matches the desired criteria. For normal (numeric) comparisons the
<var>version</var> argument has the format
<code><var>major</var>[.<var>minor</var>[.<var>patch</var>]]</code>, e.g.
<code>2.1.0</code> or <code>2.2</code>. <var>minor</var> and
<var>patch</var> are optional. If these numbers are omitted, they are
assumed to be zero. The following numerical <var>operator</var>s are
possible:</p>
<table style="zebra" border="1">
<tr><th><var>operator</var></th><th>description</th></tr>
<tr><td><code>=</code> or <code>==</code></td>
<td>httpd version is equal</td></tr>
<tr><td><code>></code></td>
<td>httpd version is greater than</td></tr>
<tr><td><code>>=</code></td>
<td>httpd version is greater or equal</td></tr>
<tr><td><code><</code></td>
<td>httpd version is less than</td></tr>
<tr><td><code><=</code></td>
<td>httpd version is less or equal</td></tr>
</table>
<example><title>Example</title>
<highlight language="config">
<IfVersion >= 2.3>
# this happens only in versions greater or
# equal 2.3.0.
</IfVersion>
</highlight>
</example>
<p>Besides the numerical comparison it is possible to match a
<glossary ref="regex">regular expression</glossary>
against the httpd version. There are two ways to write it:</p>
<table style="zebra" border="1">
<tr><th><var>operator</var></th><th>description</th></tr>
<tr><td><code>=</code> or <code>==</code></td>
<td><var>version</var> has the form
<code>/<var>regex</var>/</code></td></tr>
<tr><td><code>~</code></td>
<td><var>version</var> has the form
<code><var>regex</var></code></td></tr>
</table>
<example><title>Example</title>
<highlight language="config">
<IfVersion = /^2.4.[01234]$/>
# e.g. workaround for buggy versions
</IfVersion>
</highlight>
</example>
<p>In order to reverse the meaning, all operators can be preceded by an
exclamation mark (<code>!</code>):</p>
<highlight language="config">
<IfVersion !~ ^2.4.[01234]$>
# not for those versions
</IfVersion>
</highlight>
<p>If the <var>operator</var> is omitted, it is assumed to be
<code>=</code>.</p>
</usage>
</directivesynopsis>
</modulesynopsis>
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