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<title>Expires Directives - Configure - H2O - the optimized HTTP/2 server</title>
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<a href="configure.html">Configure</a> >
Expires Directives
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<p>
This document describes the configuration directives of the expires handler.
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<div id="expires" class="directive-head">
<h3><a href="configure/expires_directives.html#expires"><code>"expires"</code></a></h3>
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<dl class="directive-desc">
<dt>Description:</dt>
<dd>
<p>
An optional directive for setting the <code>Cache-Control: max-age=</code> header.
</p>
<ul>
<li>if the argument is <code>OFF</code> the feature is not used
<li>if the value is <code><i>NUMBER</i> <i>UNIT</i></code> then the header is set
<li>the units recognized are: <code>second</code>, <code>minute</code>, <code>hour</code>, <code>day</code>, <code>month</code>, <code>year</code>
<li> the units can also be in plural forms
</ul>
<div class="example">
<div class="caption">Example. Set <code>Cache-Control: max-age=86400</code></div>
<pre><code>expires: 1 day
</code></pre>
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<p>
You can also find an example that conditionally sets the header depending on the aspects of a request in <a href="configure/mruby.html#modifying-response">Modifying the Response section of the Mruby directives documentation</a>.
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<dt><a href="configure/syntax_and_structure.html#config_levels">Level</a>:</dt>
<dd>global, host, path, extension</dd>
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