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<div id="page-content"><div id="preamble"><h1>Apache模块 mod_cache</h1>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="module">
<tr><th><a href="module-dict.html#Description">说明</a></th><td>基于URI键的内容动态缓冲(内存或磁盘)</td></tr>
<tr><th><a href="module-dict.html#Status">状态</a></th><td>扩展(E)</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">模块名</a></th><td>cache_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">源文件</a></th><td>mod_cache.c</td></tr>
</table>
<h3>概述</h3>
<div class="warning">This module should be used with care and
can be used to circumvent <code class="directive"><a href="../mod/mod_authz_host.html#allow">Allow</a></code>和<code class="directive"><a href="../mod/mod_authz_host.html#deny">Deny</a></code> directives. You
should not enable caching for any content to which you wish
to limit access by client host name, address or environment
variable.</div>
<p><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> implements an <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a> compliant HTTP
content cache that can be used to cache either local or proxied content.
<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> requires the services of one or more storage
management modules. Two storage management modules are included in
the base Apache distribution:</p>
<dl>
<dt><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code></dt>
<dd>implements a disk based storage manager.</dd>
<dt><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code></dt>
<dd>implements a memory based storage manager.
<code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> can be configured to operate in two
modes: caching open file descriptors or caching objects in heap storage.
<code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> can be used to cache locally generated content
or to cache backend server content for <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> when
configured using <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>
(aka <dfn>reverse proxy</dfn>)</dd>
</dl>
<p>Content is stored in and retrieved from the cache using URI based keys. Content with
access protection is not cached.</p>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="related" id="related">Related Modules and Directives</a></h2>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="related">
<tr><th>相关模块</th><th>相关指令</th></tr>
<tr><td><ul><li><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code></li><li><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/mod_disk_cache.html#cacheroot">CacheRoot</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachesize">CacheSize</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachedirlevels">CacheDirLevels</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachedirlength">CacheDirLength</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cacheminfilesize">CacheMinFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachemaxfilesize">CacheMaxFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcachesize">MCacheSize</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcachemaxobjectcount">MCacheMaxObjectCount</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcacheminobjectsize">MCacheMinObjectSize</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcachemaxobjectsize">MCacheMaxObjectSize</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcacheremovalalgorithm">MCacheRemovalAlgorithm</a></code></li><li><code class="directive"><a href="../mod/mod_mem_cache.html#mcachemaxstreamingbuffer">MCacheMaxStreamingBuffer</a></code></li></ul></td></tr>
</table>
</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="section">
<h2><a name="sampleconf" id="sampleconf">Sample Configuration</a></h2>
<div class="example"><h3>Sample httpd.conf</h3><p><code>
#<br />
# Sample Cache Configuration<br />
#<br />
LoadModule cache_module modules/mod_cache.so<br />
<br />
<IfModule mod_cache.c><br />
<span class="indent">
#LoadModule disk_cache_module modules/mod_disk_cache.so<br />
# If you want to use mod_disk_cache instead of mod_mem_cache,<br />
# uncomment the line above and comment out the LoadModule line below.<br />
<IfModule mod_disk_cache.c><br />
<span class="indent">
CacheRoot c:/cacheroot<br />
CacheEnable disk /<br />
CacheDirLevels 5<br />
CacheDirLength 3<br />
</span>
</IfModule> <br />
<br />
LoadModule mem_cache_module modules/mod_mem_cache.so<br />
<IfModule mod_mem_cache.c><br />
<span class="indent">
CacheEnable mem /<br />
MCacheSize 4096<br />
MCacheMaxObjectCount 100<br />
MCacheMinObjectSize 1<br />
MCacheMaxObjectSize 2048<br />
</span>
</IfModule><br />
<br />
# When acting as a proxy, don't cache the list of security updates<br />
CacheDisable http://security.update.server/update-list/<br />
</span>
</IfModule>
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheDefaultExpire" id="CacheDefaultExpire">CacheDefaultExpire</a> <a name="cachedefaultexpire" id="cachedefaultexpire">指令</a></h2>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="directive">
<tr><th><a href="directive-dict.html#Description">说明</a></th><td>The default duration to cache a document when no expiry date is specified.</td></tr>
<tr><th><a href="directive-dict.html#Syntax">语法</a></th><td><code>CacheDefaultExpire <var>seconds</var></code></td></tr>
<tr><th><a href="directive-dict.html#Default">默认值</a></th><td><code>CacheDefaultExpire 3600 (one hour)</code></td></tr>
<tr><th><a href="directive-dict.html#Context">作用域</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">状态</a></th><td>扩展(E)</td></tr>
<tr><th><a href="directive-dict.html#Module">模块</a></th><td>mod_cache</td></tr>
</table>
<p><code class="directive">CacheDefaultExpire</code> directive specifies a default time,
in seconds, to cache a document if neither an expiry date nor last-modified date are provided
with the document. The value specified with the <code class="directive">CacheMaxExpire</code>
directive does <em>not</em> override this setting.</p>
<div class="example"><p><code>
CacheDefaultExpire 86400
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheDisable" id="CacheDisable">CacheDisable</a> <a name="cachedisable" id="cachedisable">指令</a></h2>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="directive">
<tr><th><a href="directive-dict.html#Description">说明</a></th><td>Disable caching of specified URLs</td></tr>
<tr><th><a href="directive-dict.html#Syntax">语法</a></th><td><code>CacheDisable <var> url-string</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">作用域</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">状态</a></th><td>扩展(E)</td></tr>
<tr><th><a href="directive-dict.html#Module">模块</a></th><td>mod_cache</td></tr>
</table>
<p><code class="directive">CacheDisable</code> directive instructs
<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to <em>not</em> cache urls at or below
<var>url-string</var>.</p>
<div class="example"><h3>示例</h3><p><code>
CacheDisable /local_files
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheEnable" id="CacheEnable">CacheEnable</a> <a name="cacheenable" id="cacheenable">指令</a></h2>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="directive">
<tr><th><a href="directive-dict.html#Description">说明</a></th><td>Enable caching of specified URLs using a specified storage
manager</td></tr>
<tr><th><a href="directive-dict.html#Syntax">语法</a></th><td><code>CacheEnable <var>cache_type</var> <var>url-string</var></code></td></tr>
<tr><th><a href="directive-dict.html#Context">作用域</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">状态</a></th><td>扩展(E)</td></tr>
<tr><th><a href="directive-dict.html#Module">模块</a></th><td>mod_cache</td></tr>
</table>
<p><code class="directive">CacheEnable</code> directive instructs
<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to cache urls at or below
<var>url-string</var>. The cache storage manager is specified with the
<var>cache_type</var> argument. <var>cache_type</var> <code> mem</code>
instructs <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the memory based storage
manager implemented by <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code>.
<var>cache_type</var> <code>disk</code> instructs
<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the disk based storage manager
implemented by <code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code>.
<var>cache_type</var> <code>fd</code> instructs
<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the file descriptor cache implemented
by <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code>.</p>
<p>In the event that the URL space overlaps between different
<code class="directive">CacheEnable</code> directives (as in the example below),
each possible storage manager will be run until the first one that
actually processes the request. The order in which the storage managers are
run is determined by the order of the <code class="directive">CacheEnable</code>
directives in the configuration file.</p>
<div class="example"><p><code>
CacheEnable mem /manual<br />
CacheEnable fd /images<br />
CacheEnable disk /<br />
</code></p></div>
<p>When acting as a forward proxy server, <var>url-string</var> can
also be used to specify remote sites and proxy protocols which
caching should be enabled for.</p>
<div class="example"><p><code>
# Cache proxied url's<br />
CacheEnable disk /<br /><br />
# Cache FTP-proxied url's<br />
CacheEnable disk ftp://<br /><br />
# Cache content from www.apache.org<br />
CacheEnable disk http://www.apache.org/<br />
</code></p></div>
</div>
<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
<div class="directive-section"><h2><a name="CacheIgnoreCacheControl" id="CacheIgnoreCacheControl">CacheIgnoreCacheControl</a> <a name="cacheignorecachecontrol" id="cacheignorecachecontrol">指令</a></h2>
<table border="1" cellpadding="0" cellspacing="0" bordercolor="#AAAAAA" class="directive">
<tr><th><a href="directive-dict.html#Description">说明</a></th><td>Ignore request to not serve cached content to client</td></tr>
<tr><th><a href="directive-dict.html#Syntax">语法</a></th><td><code>CacheIgnoreCacheControl On|Off</code></td></tr>
<tr><th><a href="directive-dict.html#Default">默认值</a></th><td><code>CacheIgnoreCacheControl Off</code></td></tr>
<tr><th><a href="directive-dict.html#Context">作用域</a></th><td>server config, virtual host</td></tr>
<tr><th><a href="directive-dict.html#Status">状态</a></th><td>扩展(E)</td></tr>
<tr><th><a href="directive-dict.html#Module">模块</a></th><td>mod_cache</td></tr>
</table>
<p>Ordinarily, requests containing a Cache-Control: no-cache or
Pragma: no-cache header value will not be served from the cache. The
<code class="directive">CacheIgnoreCacheControl</code> directive allows this
behavior to be overridden. <code class="directive">CacheIgnoreCacheControl</code>
On tells the server to attempt to serve the resource from the cache even
if the request contains no-cache header values. Resources requiring
authorization will <em>never</em> be cached.</p>
<div class="example"><p><code>
CacheIgnoreCacheControl On
</code></p></div>
<div class="warning"><h3>Warning:</h3>
This directive will allow serving from the cache even if the client has
requested that the document not be served from the cache. This might
result in stale content being served.
</div>
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