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<div id="preamble"><h1>Apache Module mod_version</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_version.html" title="English">&nbsp;en&nbsp;</a> |
<a href="../ja/mod/mod_version.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Version dependent configuration</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>version_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_version.c</td></tr>
<tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.0.56 and later</td></tr></table>
<h3>Summary</h3>

    <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 -- <code class="directive"><a href="#ifversion">&lt;IfVersion&gt;</a></code>, which
    allows a flexible version checking including numeric comparisons and
    regular expressions.</p>

    <div class="example"><h3>Examples</h3><p><code>
      &lt;IfVersion 2.1.0&gt;<br />
      <span class="indent">
        # current httpd version is exactly 2.1.0<br />
      </span>
      &lt;/IfVersion&gt;<br />
      <br />
      &lt;IfVersion &gt;= 2.2&gt;<br />
      <span class="indent">
        # use really new features :-)<br />
      </span>
      &lt;/IfVersion&gt;
    </code></p></div>

    <p>See below for further possibilities.</p>
</div>
<div id="quickview"><h3 class="directives">Directives</h3>
<ul id="toc">
<li><img alt="" src="../images/down.gif" /> <a href="#ifversion">&lt;IfVersion&gt;</a></li>
</ul>
</div>

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<div class="directive-section"><h2><a name="IfVersion" id="IfVersion">&lt;IfVersion&gt;</a> <a name="ifversion" id="ifversion">Directive</a></h2>
<table class="directive">
<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>contains version dependent configuration</td></tr>
<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>&lt;IfVersion [[!]<var>operator</var>] <var>version</var>&gt; ...
&lt;/IfVersion&gt;</code></td></tr>
<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory, .htaccess</td></tr>
<tr><th><a href="directive-dict.html#Override">Override:</a></th><td>All</td></tr>
<tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_version</td></tr>
</table>
    <p>The <code class="directive">&lt;IfVersion&gt;</code> section encloses
    configuration directives which are executed only if the
    <code class="program"><a href="../programs/httpd.html">httpd</a></code> 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 class="bordered"><tr class="header"><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 class="odd"><td><code>&gt;</code></td>
        <td>httpd version is greater than</td></tr>
<tr><td><code>&gt;=</code></td>
        <td>httpd version is greater or equal</td></tr>
<tr class="odd"><td><code>&lt;</code></td>
        <td>httpd version is less than</td></tr>
<tr><td><code>&lt;=</code></td>
        <td>httpd version is less or equal</td></tr>
</table>

    <div class="example"><h3>Example</h3><p><code>
      &lt;IfVersion &gt;= 2.1&gt;<br />
      <span class="indent">
        # this happens only in versions greater or<br />
        # equal 2.1.0.<br />
      </span>
      &lt;/IfVersion&gt;
    </code></p></div>

    <p>Besides the numerical comparison it is possible to match a 
    <a class="glossarylink" href="../glossary.html#regex" title="see glossary">regular expression</a> 
    against the httpd version. There are two ways to write it:</p>

    <table class="bordered"><tr class="header"><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 class="odd"><td><code>~</code></td>
        <td><var>version</var> has the form
            <code><var>regex</var></code></td></tr>
</table>

    <div class="example"><h3>Example</h3><p><code>
      &lt;IfVersion = /^2.1.[01234]$/&gt;<br />
      <span class="indent">
        # e.g. workaround for buggy versions
      </span>
      &lt;/IfVersion&gt;
    </code></p></div>

    <p>In order to reverse the meaning, all operators can be preceded by an
    exclamation mark (<code>!</code>):</p>

    <div class="example"><p><code>
      &lt;IfVersion !~ ^2.1.[01234]$&gt;<br />
      <span class="indent">
        # not for those versions<br />
      </span>
      &lt;/IfVersion&gt;
    </code></p></div>

    <p>If the <var>operator</var> is omitted, it is assumed to be
    <code>=</code>.</p>

</div>
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