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-<p class="apache">Apache HTTP Server Version 2.0</p>
-<img alt="" src="../images/feather.gif" /></div>
-<div class="up"><a href="./"><img title="&lt;-" alt="&lt;-" src="../images/left.gif" /></a></div>
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-<a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.0</a> &gt; <a href="./">Modules</a></div>
-<div id="page-content">
-<div id="preamble"><h1>Apache Module mod_expires</h1>
-<div class="toplang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_expires.html" title="English">&nbsp;en&nbsp;</a> |
-<a href="../ja/mod/mod_expires.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
-<a href="../ko/mod/mod_expires.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
-</div>
-<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Generation of <code>Expires</code> and
-<code>Cache-Control</code> HTTP headers according to user-specified
-criteria</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>expires_module</td></tr>
-<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_expires.c</td></tr></table>
-<h3>Summary</h3>
-
- <p>This module controls the setting of the <code>Expires</code>
- HTTP header and the <code>max-age</code> directive of the
- <code>Cache-Control</code> HTTP header in server responses. The
- expiration date can set to be relative to either the time the
- source file was last modified, or to the time of the client
- access.</p>
-
- <p>These HTTP headers are an instruction to the client about the
- document's validity and persistence. If cached, the document may
- be fetched from the cache rather than from the source until this
- time has passed. After that, the cache copy is considered
- "expired" and invalid, and a new copy must be obtained from the
- source.</p>
-
- <p>To modify <code>Cache-Control</code> directives other than
- <code>max-age</code> (see <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9">RFC
- 2616 section 14.9</a>), you can use the <code class="directive"><a href="../mod/mod_headers.html#header">Header</a></code> directive.</p>
-
-</div>
-<div id="quickview"><h3 class="directives">Directives</h3>
-<ul id="toc">
-<li><img alt="" src="../images/down.gif" /> <a href="#expiresactive">ExpiresActive</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#expiresbytype">ExpiresByType</a></li>
-<li><img alt="" src="../images/down.gif" /> <a href="#expiresdefault">ExpiresDefault</a></li>
-</ul>
-<h3>Topics</h3>
-<ul id="topics">
-<li><img alt="" src="../images/down.gif" /> <a href="#AltSyn">Alternate Interval Syntax</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="AltSyn" id="AltSyn">Alternate Interval Syntax</a></h2>
- <p>The <code class="directive"><a href="#expiresdefault">ExpiresDefault</a></code> and
- <code class="directive"><a href="#expiresbytype">ExpiresByType</a></code> directives
- can also be defined in a more readable syntax of the form:</p>
-
- <div class="example"><p><code>
- ExpiresDefault "&lt;base&gt; [plus] {&lt;num&gt;
- &lt;type&gt;}*"<br />
- ExpiresByType type/encoding "&lt;base&gt; [plus]
- {&lt;num&gt; &lt;type&gt;}*"
- </code></p></div>
-
- <p>where &lt;base&gt; is one of:</p>
-
- <ul>
- <li><code>access</code></li>
-
- <li><code>now</code> (equivalent to
- '<code>access</code>')</li>
-
- <li><code>modification</code></li>
- </ul>
-
- <p>The <code>plus</code> keyword is optional. &lt;num&gt;
- should be an integer value [acceptable to <code>atoi()</code>],
- and &lt;type&gt; is one of:</p>
-
- <ul>
- <li><code>years</code></li>
- <li><code>months</code></li>
- <li><code>weeks</code></li>
- <li><code>days</code></li>
- <li><code>hours</code></li>
- <li><code>minutes</code></li>
- <li><code>seconds</code></li>
- </ul>
-
- <p>For example, any of the following directives can be used to
- make documents expire 1 month after being accessed, by
- default:</p>
-
- <div class="example"><p><code>
- ExpiresDefault "access plus 1 month"<br />
- ExpiresDefault "access plus 4 weeks"<br />
- ExpiresDefault "access plus 30 days"
- </code></p></div>
-
- <p>The expiry time can be fine-tuned by adding several
- '&lt;num&gt; &lt;type&gt;' clauses:</p>
-
- <div class="example"><p><code>
- ExpiresByType text/html "access plus 1 month 15
- days 2 hours"<br />
- ExpiresByType image/gif "modification plus 5 hours 3
- minutes"
- </code></p></div>
-
- <p>Note that if you use a modification date based setting, the
- Expires header will <strong>not</strong> be added to content
- that does not come from a file on disk. This is due to the fact
- that there is no modification time for such content.</p>
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="ExpiresActive" id="ExpiresActive">ExpiresActive</a> <a name="expiresactive" id="expiresactive">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enables generation of <code>Expires</code>
-headers</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ExpiresActive On|Off</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>Indexes</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_expires</td></tr>
-</table>
- <p>This directive enables or disables the generation of the
- <code>Expires</code> and <code>Cache-Control</code> headers for
- the document realm in question. (That is, if found in an
- <code>.htaccess</code> file, for instance, it applies only to
- documents generated from that directory.) If set to
- <code>Off</code>, the headers will not be generated for any
- document in the realm (unless overridden at a lower level, such as
- an <code>.htaccess</code> file overriding a server config
- file). If set to <code>On</code>, the headers will be added to
- served documents according to the criteria defined by the
- <code class="directive"><a href="#expiresbytype">ExpiresByType</a></code> and
- <code class="directive"><a href="#expiresdefault">ExpiresDefault</a></code>
- directives (<em>q.v.</em>).</p>
-
- <p>Note that this directive does not guarantee that an
- <code>Expires</code> or <code>Cache-Control</code> header will be
- generated. If the criteria aren't met, no header will be sent, and
- the effect will be as though this directive wasn't even
- specified.</p>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="ExpiresByType" id="ExpiresByType">ExpiresByType</a> <a name="expiresbytype" id="expiresbytype">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Value of the <code>Expires</code> header configured
-by MIME type</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ExpiresByType <var>MIME-type</var>
-<var>&lt;code&gt;seconds</var></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>Indexes</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_expires</td></tr>
-</table>
- <p>This directive defines the value of the <code>Expires</code>
- header and the <code>max-age</code> directive of the
- <code>Cache-Control</code> header generated for documents of the
- specified type (<em>e.g.</em>, <code>text/html</code>). The second
- argument sets the number of seconds that will be added to a base
- time to construct the expiration date. The <code>Cache-Control:
- max-age</code> is calculated by subtracting the request time from
- the expiration date and expressing the result in seconds.</p>
-
- <p>The base time is either the last modification time of the
- file, or the time of the client's access to the document. Which
- should be used is specified by the
- <code><var>&lt;code&gt;</var></code> field; <code>M</code>
- means that the file's last modification time should be used as
- the base time, and <code>A</code> means the client's access
- time should be used.</p>
-
- <p>The difference in effect is subtle. If <code>M</code> is used,
- all current copies of the document in all caches will expire at
- the same time, which can be good for something like a weekly
- notice that's always found at the same URL. If <code>A</code> is
- used, the date of expiration is different for each client; this
- can be good for image files that don't change very often,
- particularly for a set of related documents that all refer to
- the same images (<em>i.e.</em>, the images will be accessed
- repeatedly within a relatively short timespan).</p>
-
- <div class="example"><h3>Example:</h3><p><code>
- # enable expirations<br />
- ExpiresActive On<br />
- # expire GIF images after a month in the client's cache<br />
- ExpiresByType image/gif A2592000<br />
- # HTML documents are good for a week from the<br />
- # time they were changed<br />
- ExpiresByType text/html M604800
- </code></p></div>
-
- <p>Note that this directive only has effect if
- <code>ExpiresActive On</code> has been specified. It overrides,
- for the specified MIME type <em>only</em>, any expiration date
- set by the <code class="directive"><a href="#expiresdefault">ExpiresDefault</a></code>
- directive.</p>
-
- <p>You can also specify the expiration time calculation using
- an <a href="#AltSyn">alternate syntax</a>, described earlier in
- this document.</p>
-
-</div>
-<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
-<div class="directive-section"><h2><a name="ExpiresDefault" id="ExpiresDefault">ExpiresDefault</a> <a name="expiresdefault" id="expiresdefault">Directive</a></h2>
-<table class="directive">
-<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Default algorithm for calculating expiration time</td></tr>
-<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>ExpiresDefault <var>&lt;code&gt;seconds</var></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>Indexes</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_expires</td></tr>
-</table>
- <p>This directive sets the default algorithm for calculating the
- expiration time for all documents in the affected realm. It can be
- overridden on a type-by-type basis by the <code class="directive"><a href="#expiresbytype">ExpiresByType</a></code> directive. See the
- description of that directive for details about the syntax of the
- argument, and the <a href="#AltSyn">alternate syntax</a>
- description as well.</p>
-
-</div>
-</div>
-<div class="bottomlang">
-<p><span>Available Languages: </span><a href="../en/mod/mod_expires.html" title="English">&nbsp;en&nbsp;</a> |
-<a href="../ja/mod/mod_expires.html" hreflang="ja" rel="alternate" title="Japanese">&nbsp;ja&nbsp;</a> |
-<a href="../ko/mod/mod_expires.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
-</div><div id="footer">
-<p class="apache">Copyright 2009 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>
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