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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 06:33:50 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 06:33:50 +0000 |
| commit | fe39ffb8b90ae4e002ed73fe98617cd590abb467 (patch) | |
| tree | b80e5956907d8aeaaffe4e4f0c068c0e6157ce8b /docs/manual/mod/mod_cache.html | |
| parent | Initial commit. (diff) | |
| download | apache2-fe39ffb8b90ae4e002ed73fe98617cd590abb467.tar.xz apache2-fe39ffb8b90ae4e002ed73fe98617cd590abb467.zip | |
Adding upstream version 2.4.56.upstream/2.4.56upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
| -rw-r--r-- | docs/manual/mod/mod_cache.html | 17 | ||||
| -rw-r--r-- | docs/manual/mod/mod_cache.html.en | 1078 | ||||
| -rw-r--r-- | docs/manual/mod/mod_cache.html.fr.utf8 | 1187 | ||||
| -rw-r--r-- | docs/manual/mod/mod_cache.html.ja.utf8 | 680 | ||||
| -rw-r--r-- | docs/manual/mod/mod_cache.html.ko.euc-kr | 532 |
5 files changed, 3494 insertions, 0 deletions
diff --git a/docs/manual/mod/mod_cache.html b/docs/manual/mod/mod_cache.html new file mode 100644 index 0000000..40128b0 --- /dev/null +++ b/docs/manual/mod/mod_cache.html @@ -0,0 +1,17 @@ +# GENERATED FROM XML -- DO NOT EDIT + +URI: mod_cache.html.en +Content-Language: en +Content-type: text/html; charset=UTF-8 + +URI: mod_cache.html.fr.utf8 +Content-Language: fr +Content-type: text/html; charset=UTF-8 + +URI: mod_cache.html.ja.utf8 +Content-Language: ja +Content-type: text/html; charset=UTF-8 + +URI: mod_cache.html.ko.euc-kr +Content-Language: ko +Content-type: text/html; charset=EUC-KR diff --git a/docs/manual/mod/mod_cache.html.en b/docs/manual/mod/mod_cache.html.en new file mode 100644 index 0000000..d554c51 --- /dev/null +++ b/docs/manual/mod/mod_cache.html.en @@ -0,0 +1,1078 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> +<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_cache - Apache HTTP Server Version 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> +<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<body> +<div id="page-header"> +<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p> +<p class="apache">Apache HTTP Server Version 2.4</p> +<img alt="" src="../images/feather.png" /></div> +<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div> +<div id="page-content"> +<div id="preamble"><h1>Apache Module mod_cache</h1> +<div class="toplang"> +<p><span>Available Languages: </span><a href="../en/mod/mod_cache.html" title="English"> en </a> | +<a href="../fr/mod/mod_cache.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | +<a href="../ja/mod/mod_cache.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../ko/mod/mod_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> +</div> +<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>RFC 2616 compliant HTTP caching filter.</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>cache_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_cache.c</td></tr></table> +<h3>Summary</h3> + + <div class="warning">This module should be used with care, as when the + <code class="directive"><a href="#cachequickhandler">CacheQuickHandler</a></code> directive is + in its default value of <strong>on</strong>, the <code class="directive"><a href="../mod/mod_access_compat.html#allow">Allow</a></code> and <code class="directive"><a href="../mod/mod_access_compat.html#deny">Deny</a></code> directives will be circumvented. + You should not enable quick handler 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 + <strong>HTTP content caching filter</strong>, with support for the caching + of content negotiated responses containing the Vary header.</p> + + <p>RFC 2616 compliant caching provides a mechanism to verify whether + stale or expired content is still fresh, and can represent a significant + performance boost when the origin server supports <strong>conditional + requests</strong> by honouring the + <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26">If-None-Match</a> + HTTP request header. Content is only regenerated from scratch when the content + has changed, and not when the cached entry expires.</p> + + <p>As a filter, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> can be placed in front of + content originating from any handler, including <strong>flat + files</strong> (served from a slow disk cached on a fast disk), the output + of a <strong>CGI script</strong> or <strong>dynamic content + generator</strong>, or content <strong>proxied from another + server</strong>.</p> + + <p>In the default configuration, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> inserts the + caching filter as far forward as possible within the filter stack, + utilising the <strong>quick handler</strong> to bypass all per request + processing when returning content to the client. In this mode of + operation, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> may be thought of as a caching + proxy server bolted to the front of the webserver, while running within + the webserver itself.</p> + + <p>When the quick handler is switched off using the + <code class="directive"><a href="#cachequickhandler">CacheQuickHandler</a></code> directive, + it becomes possible to insert the <strong>CACHE</strong> filter at a + point in the filter stack chosen by the administrator. This provides the + opportunity to cache content before that content is personalised by the + <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> filter, or optionally compressed by the + <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> filter.</p> + + <p>Under normal operation, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> will respond to + and can be controlled by the + <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9">Cache-Control</a> + and + <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.32">Pragma</a> + headers sent from a client in a request, or from a + server within a response. Under exceptional circumstances, + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> can be configured to override these headers + and force site specific behaviour, however such behaviour will be limited + to this cache only, and will not affect the operation of other caches + that may exist between the client and server, and as a result is not + recommended unless strictly necessary.</p> + + <p>RFC 2616 allows for the cache to return stale data while the existing + stale entry is refreshed from the origin server, and this is supported + by <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> when the + <code class="directive"><a href="#cachelock">CacheLock</a></code> directive is suitably + configured. Such responses will contain a + <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.46">Warning</a> + HTTP header with a 110 response code. RFC 2616 also allows a cache to return + stale data when the attempt made to refresh the stale data returns an + error 500 or above, and this behaviour is supported by default by + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>. Such responses will contain a + <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.46">Warning</a> + HTTP header with a 111 response code.</p> + + <p><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> requires the services of one or more + storage management modules. The following storage management modules are included in + the base Apache distribution:</p> + <dl> + <dt><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code></dt> + <dd>Implements a disk based storage manager. Headers and bodies are + stored separately on disk, in a directory structure derived from the + md5 hash of the cached URL. Multiple content negotiated responses can + be stored concurrently, however the caching of partial content is not + supported by this module. The <code class="program"><a href="../programs/htcacheclean.html">htcacheclean</a></code> tool is + provided to list cached URLs, remove cached URLs, or to maintain the size + of the disk cache within size and inode limits.</dd> + <dt><code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code></dt> + <dd>Implements a shared object cache based storage manager. Headers and + bodies are stored together beneath a single key based on the URL of the + response being cached. Multiple content negotiated responses can + be stored concurrently, however the caching of partial content is not + supported by this module.</dd> + </dl> + + <p>Further details, discussion, and examples, are provided in the + <a href="../caching.html">Caching Guide</a>.</p> +</div> +<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3> +<ul id="topics"> +<li><img alt="" src="../images/down.gif" /> <a href="#related">Related Modules and Directives</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#sampleconf">Sample Configuration</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#thunderingherd">Avoiding the Thundering Herd</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#finecontrol">Fine Control with the CACHE Filter</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#status">Cache Status and Logging</a></li> +</ul><h3 class="directives">Directives</h3> +<ul id="toc"> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedefaultexpire">CacheDefaultExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedetailheader">CacheDetailHeader</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedisable">CacheDisable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheenable">CacheEnable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheheader">CacheHeader</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreheaders">CacheIgnoreHeaders</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorenolastmod">CacheIgnoreNoLastMod</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorequerystring">CacheIgnoreQueryString</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreurlsessionidentifiers">CacheIgnoreURLSessionIdentifiers</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachekeybaseurl">CacheKeyBaseURL</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelastmodifiedfactor">CacheLastModifiedFactor</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelock">CacheLock</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelockmaxage">CacheLockMaxAge</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelockpath">CacheLockPath</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxexpire">CacheMaxExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheminexpire">CacheMinExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachequickhandler">CacheQuickHandler</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestaleonerror">CacheStaleOnError</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestoreexpired">CacheStoreExpired</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestorenostore">CacheStoreNoStore</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestoreprivate">CacheStorePrivate</a></li> +</ul> +<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_cache">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_cache">Report a bug</a></li></ul><h3>See also</h3> +<ul class="seealso"> +<li><a href="../caching.html">Caching Guide</a></li> +<li><a href="#comments_section">Comments</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="related" id="related">Related Modules and Directives</a></h2> + <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code></li><li><code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/mod_cache_disk.html#cacheroot">CacheRoot</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachedirlevels">CacheDirLevels</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachedirlength">CacheDirLength</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cacheminfilesize">CacheMinFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachemaxfilesize">CacheMaxFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocache">CacheSocache</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachemaxtime">CacheSocacheMaxTime</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachemintime">CacheSocacheMinTime</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachemaxsize">CacheSocacheMaxSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachereadsize">CacheSocacheReadSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachereadtime">CacheSocacheReadTime</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><pre class="prettyprint lang-config"># +# Sample Cache Configuration +# +LoadModule cache_module modules/mod_cache.so +<IfModule mod_cache.c> + LoadModule cache_disk_module modules/mod_cache_disk.so + <IfModule mod_cache_disk.c> + CacheRoot "c:/cacheroot" + CacheEnable disk "/" + CacheDirLevels 5 + CacheDirLength 3 + </IfModule> + + # When acting as a proxy, don't cache the list of security updates + CacheDisable "http://security.update.server/update-list/" +</IfModule></pre> +</div> +</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="thunderingherd" id="thunderingherd">Avoiding the Thundering Herd</a></h2> + <p>When a cached entry becomes stale, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> will submit + a conditional request to the backend, which is expected to confirm whether the + cached entry is still fresh, and send an updated entity if not.</p> + <p>A small but finite amount of time exists between the time the cached entity + becomes stale, and the time the stale entity is fully refreshed. On a busy + server, a significant number of requests might arrive during this time, and + cause a <strong>thundering herd</strong> of requests to strike the backend + suddenly and unpredictably.</p> + <p>To keep the thundering herd at bay, the <code class="directive"><a href="#cachelock">CacheLock</a></code> + directive can be used to define a directory in which locks are created for + URLs <strong>in flight</strong>. The lock is used as a <strong>hint</strong> + by other requests to either suppress an attempt to cache (someone else has + gone to fetch the entity), or to indicate that a stale entry is being refreshed + (stale content will be returned in the mean time). + </p> + <h3>Initial caching of an entry</h3> + + <p>When an entity is cached for the first time, a lock will be created for the + entity until the response has been fully cached. During the lifetime of the + lock, the cache will suppress the second and subsequent attempt to cache the + same entity. While this doesn't hold back the thundering herd, it does stop + the cache attempting to cache the same entity multiple times simultaneously. + </p> + + <h3>Refreshment of a stale entry</h3> + + <p>When an entity reaches its freshness lifetime and becomes stale, a lock + will be created for the entity until the response has either been confirmed as + still fresh, or replaced by the backend. During the lifetime of the lock, the + second and subsequent incoming request will cause stale data to be returned, + and the thundering herd is kept at bay.</p> + + <h3>Locks and Cache-Control: no-cache</h3> + + <p>Locks are used as a <strong>hint only</strong> to enable the cache to be + more gentle on backend servers, however the lock can be overridden if necessary. + If the client sends a request with a Cache-Control header forcing a reload, any + lock that may be present will be ignored, and the client's request will be + honored immediately and the cached entry refreshed.</p> + <p>As a further safety mechanism, locks have a configurable maximum age. + Once this age has been reached, the lock is removed, and a new request is + given the opportunity to create a new lock. This maximum age can be set using + the <code class="directive"><a href="#cachelockmaxage">CacheLockMaxAge</a></code> directive, and defaults + to 5 seconds. + </p> + + <h3>Example configuration</h3> + + <div class="example"><h3>Enabling the cache lock</h3><pre class="prettyprint lang-config"># +# Enable the cache lock +# +<IfModule mod_cache.c> + CacheLock on + CacheLockPath "/tmp/mod_cache-lock" + CacheLockMaxAge 5 +</IfModule></pre> +</div> + +</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="finecontrol" id="finecontrol">Fine Control with the CACHE Filter</a></h2> + <p>Under the default mode of cache operation, the cache runs as a quick handler, + short circuiting the majority of server processing and offering the highest + cache performance available.</p> + + <p>In this mode, the cache <strong>bolts onto</strong> the front of the server, + acting as if a free standing RFC 2616 caching proxy had been placed in front of + the server.</p> + + <p>While this mode offers the best performance, the administrator may find that + under certain circumstances they may want to perform further processing on the + request after the request is cached, such as to inject personalisation into the + cached page, or to apply authorization restrictions to the content. Under these + circumstances, an administrator is often forced to place independent reverse + proxy servers either behind or in front of the caching server to achieve this.</p> + + <p>To solve this problem the <code class="directive"><a href="#cachequickhandler">CacheQuickHandler</a></code> + directive can be set to <strong>off</strong>, and the server will + process all phases normally handled by a non-cached request, including the + <strong>authentication and authorization</strong> phases.</p> + + <p>In addition, the administrator may optionally specify the <strong>precise point + within the filter chain</strong> where caching is to take place by adding the + <strong>CACHE</strong> filter to the output filter chain.</p> + + <p>For example, to cache content before applying compression to the response, + place the <strong>CACHE</strong> filter before the <strong>DEFLATE</strong> + filter as in the example below:</p> + + <pre class="prettyprint lang-config"># Cache content before optional compression +CacheQuickHandler off +AddOutputFilterByType CACHE;DEFLATE text/plain</pre> + + + <p>Another option is to have content cached before personalisation is applied + by <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> (or another content processing filter). In this + example templates containing tags understood by + <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> are cached before being parsed:</p> + + <pre class="prettyprint lang-config"># Cache content before mod_include and mod_deflate +CacheQuickHandler off +AddOutputFilterByType CACHE;INCLUDES;DEFLATE text/html</pre> + + + <p>You may place the <strong>CACHE</strong> filter anywhere you wish within the + filter chain. In this example, content is cached after being parsed by + <code class="module"><a href="../mod/mod_include.html">mod_include</a></code>, but before being processed by + <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code>:</p> + + <pre class="prettyprint lang-config"># Cache content between mod_include and mod_deflate +CacheQuickHandler off +AddOutputFilterByType INCLUDES;CACHE;DEFLATE text/html</pre> + + + <div class="warning"><h3>Warning:</h3>If the location of the + <strong>CACHE</strong> filter in the filter chain is changed for any reason, + you may need to <strong>flush your cache</strong> to ensure that your data + served remains consistent. <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> is not in a position + to enforce this for you.</div> + +</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="status" id="status">Cache Status and Logging</a></h2> + <p>Once <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> has made a decision as to whether or not + an entity is to be served from cache, the detailed reason for the decision + is written to the subprocess environment within the request under the + <strong>cache-status</strong> key. This reason can be logged by the + <code class="directive"><a href="../mod/mod_log_config.html#logformat">LogFormat</a></code> directive as + follows:</p> + + <pre class="prettyprint lang-config">LogFormat "%{cache-status}e ..."</pre> + + + <p>Based on the caching decision made, the reason is also written to the + subprocess environment under one the following four keys, as appropriate:</p> + + <dl> + <dt>cache-hit</dt><dd>The response was served from cache.</dd> + <dt>cache-revalidate</dt><dd>The response was stale and was successfully + revalidated, then served from cache.</dd> + <dt>cache-miss</dt><dd>The response was served from the upstream server.</dd> + <dt>cache-invalidate</dt><dd>The cached entity was invalidated by a request + method other than GET or HEAD.</dd> + </dl> + + <p>This makes it possible to support conditional logging of cached requests + as per the following example:</p> + + <pre class="prettyprint lang-config">CustomLog "cached-requests.log" common env=cache-hit +CustomLog "uncached-requests.log" common env=cache-miss +CustomLog "revalidated-requests.log" common env=cache-revalidate +CustomLog "invalidated-requests.log" common env=cache-invalidate</pre> + + + <p>For module authors, a hook called <var>cache_status</var> is available, + allowing modules to respond to the caching outcomes above in customised + ways.</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="CacheDefaultExpire" id="CacheDefaultExpire">CacheDefaultExpire</a> <a name="cachedefaultexpire" id="cachedefaultexpire">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</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">Syntax:</a></th><td><code>CacheDefaultExpire <var>seconds</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDefaultExpire 3600 (one hour)</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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>The <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"><a href="#cachemaxexpire">CacheMaxExpire</a></code> + directive does <em>not</em> override this setting.</p> + + <pre class="prettyprint lang-config">CacheDefaultExpire 86400</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheDetailHeader" id="CacheDetailHeader">CacheDetailHeader</a> <a name="cachedetailheader" id="cachedetailheader">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Add an X-Cache-Detail header to the response.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDetailHeader <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDetailHeader 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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.9 and later</td></tr> +</table> + <p>When the <code class="directive">CacheDetailHeader</code> directive + is switched on, an <strong>X-Cache-Detail</strong> header will be added to the response + containing the detailed reason for a particular caching decision.</p> + + <p>It can be useful during development of cached RESTful services to have additional + information about the caching decision written to the response headers, so as to + confirm whether <code>Cache-Control</code> and other headers have been correctly + used by the service and client.</p> + + <p>If the normal handler is used, this directive may appear within a + <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> or + <code class="directive"><a href="../mod/core.html#location"><Location></a></code> directive. If the quick handler + is used, this directive must appear within a server or virtual host context, otherwise + the setting will be ignored.</p> + + <pre class="prettyprint lang-config"># Enable the X-Cache-Detail header +CacheDetailHeader on</pre> + + + <div class="example"><p><code> + X-Cache-Detail: "conditional cache hit: entity refreshed" from localhost<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="CacheDisable" id="CacheDisable">CacheDisable</a> <a name="cachedisable" id="cachedisable">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Disable caching of specified URLs</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDisable <var>url-string</var> | <var>on</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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>The <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>Example</h3><pre class="prettyprint lang-config">CacheDisable "/local_files"</pre> +</div> + + <p>If used in a <code class="directive"><a href="../mod/core.html#location"><Location></a></code> directive, + the path needs to be specified below the Location, or if the word "on" + is used, caching for the whole location will be disabled.</p> + + <div class="example"><h3>Example</h3><pre class="prettyprint lang-config"><Location "/foo"> + CacheDisable on +</Location></pre> +</div> + + <p>The <code>no-cache</code> environment variable can be set to + disable caching on a finer grained set of resources in versions + 2.2.12 and later.</p> + + +<h3>See also</h3> +<ul> +<li><a href="../env.html">Environment Variables in Apache</a></li> +</ul> +</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">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable caching of specified URLs using a specified storage +manager</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheEnable <var>cache_type</var> [<var>url-string</var>]</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host, directory</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_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>A url-string of '/' applied to forward proxy content in 2.2 and + earlier.</td></tr> +</table> + <p>The <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. The <code class="directive">CacheEnable</code> + directive can alternatively be placed inside either + <code class="directive"><a href="../mod/core.html#location"><Location></a></code> or + <code class="directive"><a href="../mod/core.html#locationmatch"><LocationMatch></a></code> sections to indicate + the content is cacheable. + <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_cache_disk.html">mod_cache_disk</a></code>. <var>cache_type</var> + <code>socache</code> instructs <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the + shared object cache based storage manager implemented by + <code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</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. <code class="directive">CacheEnable</code> + directives within <code class="directive"><a href="../mod/core.html#location"><Location></a></code> or + <code class="directive"><a href="../mod/core.html#locationmatch"><LocationMatch></a></code> sections are processed + before globally defined <code class="directive">CacheEnable</code> directives.</p> + + <p>When acting as a forward proxy server, <var>url-string</var> must + minimally begin with a protocol for which caching should be enabled.</p> + + <pre class="prettyprint lang-config"># Cache content (normal handler only) +CacheQuickHandler off +<Location "/foo"> + CacheEnable disk +</Location> + +# Cache regex (normal handler only) +CacheQuickHandler off +<LocationMatch "foo$"> + CacheEnable disk +</LocationMatch> + +# Cache all but forward proxy url's (normal or quick handler) +CacheEnable disk / + +# Cache FTP-proxied url's (normal or quick handler) +CacheEnable disk ftp:// + +# Cache forward proxy content from www.example.org (normal or quick handler) +CacheEnable disk http://www.example.org/</pre> + + + <p>A hostname starting with a <strong>"*"</strong> matches all hostnames with + that suffix. A hostname starting with <strong>"."</strong> matches all + hostnames containing the domain components that follow.</p> + + <pre class="prettyprint lang-config"># Match www.example.org, and fooexample.org +CacheEnable disk "http://*example.org/" +# Match www.example.org, but not fooexample.org +CacheEnable disk "http://.example.org/"</pre> + + + <p> The <code>no-cache</code> environment variable can be set to + disable caching on a finer grained set of resources in versions + 2.2.12 and later.</p> + + +<h3>See also</h3> +<ul> +<li><a href="../env.html">Environment Variables in Apache</a></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheHeader" id="CacheHeader">CacheHeader</a> <a name="cacheheader" id="cacheheader">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Add an X-Cache header to the response.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheHeader <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheHeader 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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.9 and later</td></tr> +</table> + <p>When the <code class="directive">CacheHeader</code> directive + is switched on, an <strong>X-Cache</strong> header will be added to the response + with the cache status of this response. If the normal handler is used, this + directive may appear within a <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> + or <code class="directive"><a href="../mod/core.html#location"><Location></a></code> directive. If the quick + handler is used, this directive must appear within a server or virtual host + context, otherwise the setting will be ignored.</p> + + <dl> + <dt><strong>HIT</strong></dt><dd>The entity was fresh, and was served from + cache.</dd> + <dt><strong>REVALIDATE</strong></dt><dd>The entity was stale, was successfully + revalidated and was served from cache.</dd> + <dt><strong>MISS</strong></dt><dd>The entity was fetched from the upstream + server and was not served from cache.</dd> + </dl> + + <pre class="prettyprint lang-config"># Enable the X-Cache header +CacheHeader on</pre> + + + <pre class="prettyprint lang-config">X-Cache: HIT from localhost</pre> + + + +</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">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore request to not serve cached content to client</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheIgnoreCacheControl On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheIgnoreCacheControl Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +</table> + <p>Ordinarily, requests containing a <code>Cache-Control: no-cache</code> 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 On</code> + 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> + + <pre class="prettyprint lang-config">CacheIgnoreCacheControl On</pre> + + + <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> + +<h3>See also</h3> +<ul> +<li><code class="directive"><a href="#cachestoreprivate">CacheStorePrivate</a></code></li> +<li><code class="directive"><a href="#cachestorenostore">CacheStoreNoStore</a></code></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheIgnoreHeaders" id="CacheIgnoreHeaders">CacheIgnoreHeaders</a> <a name="cacheignoreheaders" id="cacheignoreheaders">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Do not store the given HTTP header(s) in the cache. +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheIgnoreHeaders <var>header-string</var> [<var>header-string</var>] ...</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheIgnoreHeaders None</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +</table> + <p>According to RFC 2616, hop-by-hop HTTP headers are not stored in + the cache. The following HTTP headers are hop-by-hop headers and thus + do not get stored in the cache in <em>any</em> case regardless of the + setting of <code class="directive">CacheIgnoreHeaders</code>:</p> + + <ul> + <li><code>Connection</code></li> + <li><code>Keep-Alive</code></li> + <li><code>Proxy-Authenticate</code></li> + <li><code>Proxy-Authorization</code></li> + <li><code>TE</code></li> + <li><code>Trailers</code></li> + <li><code>Transfer-Encoding</code></li> + <li><code>Upgrade</code></li> + </ul> + + <p><code class="directive">CacheIgnoreHeaders</code> specifies additional HTTP + headers that should not to be stored in the cache. For example, it makes + sense in some cases to prevent cookies from being stored in the cache.</p> + + <p><code class="directive">CacheIgnoreHeaders</code> takes a space separated list + of HTTP headers that should not be stored in the cache. If only hop-by-hop + headers not should be stored in the cache (the RFC 2616 compliant + behaviour), <code class="directive">CacheIgnoreHeaders</code> can be set to + <code>None</code>.</p> + + <div class="example"><h3>Example 1</h3><pre class="prettyprint lang-config">CacheIgnoreHeaders Set-Cookie</pre> +</div> + + <div class="example"><h3>Example 2</h3><pre class="prettyprint lang-config">CacheIgnoreHeaders None</pre> +</div> + + <div class="warning"><h3>Warning:</h3> + If headers like <code>Expires</code> which are needed for proper cache + management are not stored due to a + <code class="directive">CacheIgnoreHeaders</code> setting, the behaviour of + mod_cache is undefined. + </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="CacheIgnoreNoLastMod" id="CacheIgnoreNoLastMod">CacheIgnoreNoLastMod</a> <a name="cacheignorenolastmod" id="cacheignorenolastmod">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore the fact that a response has no Last Modified +header.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheIgnoreNoLastMod On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheIgnoreNoLastMod 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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Ordinarily, documents without a last-modified date are not cached. + Under some circumstances the last-modified date is removed (during + <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> processing for example) or not provided + at all. The <code class="directive">CacheIgnoreNoLastMod</code> directive + provides a way to specify that documents without last-modified dates + should be considered for caching, even without a last-modified date. + If neither a last-modified date nor an expiry date are provided with + the document then the value specified by the + <code class="directive"><a href="#cachedefaultexpire">CacheDefaultExpire</a></code> directive will be used to + generate an expiration date.</p> + + <pre class="prettyprint lang-config">CacheIgnoreNoLastMod On</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheIgnoreQueryString" id="CacheIgnoreQueryString">CacheIgnoreQueryString</a> <a name="cacheignorequerystring" id="cacheignorequerystring">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore query string when caching</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheIgnoreQueryString On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheIgnoreQueryString Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +</table> + <p>Ordinarily, requests with query string parameters are cached separately + for each unique query string. This is according to RFC 2616/13.9 done only + if an expiration time is specified. The + <code class="directive">CacheIgnoreQueryString</code> directive tells the cache to + cache requests even if no expiration time is specified, and to reply with + a cached reply even if the query string differs. From a caching point of + view the request is treated as if having no query string when this + directive is enabled.</p> + + <pre class="prettyprint lang-config">CacheIgnoreQueryString On</pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheIgnoreURLSessionIdentifiers" id="CacheIgnoreURLSessionIdentifiers">CacheIgnoreURLSessionIdentifiers</a> <a name="cacheignoreurlsessionidentifiers" id="cacheignoreurlsessionidentifiers">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore defined session identifiers encoded in the URL when caching +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheIgnoreURLSessionIdentifiers <var>identifier</var> [<var>identifier</var>] ...</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheIgnoreURLSessionIdentifiers None</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +</table> + <p>Sometimes applications encode the session identifier into the URL like in the following + Examples: + </p> + <ul> + <li><code>/someapplication/image.gif;jsessionid=123456789</code></li> + <li><code>/someapplication/image.gif?PHPSESSIONID=12345678</code></li> + </ul> + <p>This causes cacheable resources to be stored separately for each session, which + is often not desired. <code class="directive">CacheIgnoreURLSessionIdentifiers</code> lets + define a list of identifiers that are removed from the key that is used to identify + an entity in the cache, such that cacheable resources are not stored separately for + each session. + </p> + <p><code>CacheIgnoreURLSessionIdentifiers None</code> clears the list of ignored + identifiers. Otherwise, each identifier is added to the list.</p> + + <div class="example"><h3>Example 1</h3><pre class="prettyprint lang-config">CacheIgnoreURLSessionIdentifiers jsessionid</pre> +</div> + + <div class="example"><h3>Example 2</h3><pre class="prettyprint lang-config">CacheIgnoreURLSessionIdentifiers None</pre> +</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="CacheKeyBaseURL" id="CacheKeyBaseURL">CacheKeyBaseURL</a> <a name="cachekeybaseurl" id="cachekeybaseurl">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Override the base URL of reverse proxied cache keys.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheKeyBaseURL <var>URL</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.9 and later</td></tr> +</table> + <p>When the <code class="directive">CacheKeyBaseURL</code> directive + is specified, the URL provided will be used as the base URL to calculate + the URL of the cache keys in the reverse proxy configuration. When not specified, + the scheme, hostname and port of the current virtual host is used to construct + the cache key. When a cluster of machines is present, and all cached entries + should be cached beneath the same cache key, a new base URL can be specified + with this directive.</p> + + <pre class="prettyprint lang-config"># Override the base URL of the cache key. +CacheKeyBaseURL "http://www.example.com/"</pre> + + + <div class="warning">Take care when setting this directive. If two separate virtual + hosts are accidentally given the same base URL, entries from one virtual host + will be served to the other.</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="CacheLastModifiedFactor" id="CacheLastModifiedFactor">CacheLastModifiedFactor</a> <a name="cachelastmodifiedfactor" id="cachelastmodifiedfactor">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The factor used to compute an expiry date based on the +LastModified date.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheLastModifiedFactor <var>float</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheLastModifiedFactor 0.1</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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>In the event that a document does not provide an expiry date but does + provide a last-modified date, an expiry date can be calculated based on + the time since the document was last modified. The + <code class="directive">CacheLastModifiedFactor</code> directive specifies a + <var>factor</var> to be used in the generation of this expiry date + according to the following formula: + + <code>expiry-period = time-since-last-modified-date * <var>factor</var> + expiry-date = current-date + expiry-period</code> + + For example, if the document was last modified 10 hours ago, and + <var>factor</var> is 0.1 then the expiry-period will be set to + 10*0.1 = 1 hour. If the current time was 3:00pm then the computed + expiry-date would be 3:00pm + 1hour = 4:00pm. + + If the expiry-period would be longer than that set by + <code class="directive"><a href="#cachemaxexpire">CacheMaxExpire</a></code>, then the latter takes + precedence.</p> + + <pre class="prettyprint lang-config">CacheLastModifiedFactor 0.5</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheLock" id="CacheLock">CacheLock</a> <a name="cachelock" id="cachelock">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable the thundering herd lock.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheLock <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheLock off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.2.15 and later</td></tr> +</table> + <p>The <code class="directive">CacheLock</code> directive enables the thundering herd lock + for the given URL space.</p> + + <p>In a minimal configuration the following directive is all that is needed to + enable the thundering herd lock in the default system temp directory.</p> + + <pre class="prettyprint lang-config"># Enable cache lock +CacheLock on</pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheLockMaxAge" id="CacheLockMaxAge">CacheLockMaxAge</a> <a name="cachelockmaxage" id="cachelockmaxage">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Set the maximum possible age of a cache lock.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheLockMaxAge <var>integer</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheLockMaxAge 5</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +</table> + <p>The <code class="directive">CacheLockMaxAge</code> directive specifies the maximum + age of any cache lock.</p> + + <p>A lock older than this value in seconds will be ignored, and the next + incoming request will be given the opportunity to re-establish the lock. + This mechanism prevents a slow client taking an excessively long time to refresh + an entity.</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="CacheLockPath" id="CacheLockPath">CacheLockPath</a> <a name="cachelockpath" id="cachelockpath">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Set the lock path directory.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheLockPath <var>directory</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheLockPath /tmp/mod_cache-lock</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +</table> + <p>The <code class="directive">CacheLockPath</code> directive allows you to specify the + directory in which the locks are created. By default, the system's temporary + folder is used. Locks consist of empty files that only exist for stale URLs + in flight, so is significantly less resource intensive than the traditional + disk cache.</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="CacheMaxExpire" id="CacheMaxExpire">CacheMaxExpire</a> <a name="cachemaxexpire" id="cachemaxexpire">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum time in seconds to cache a document</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMaxExpire <var>seconds</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMaxExpire 86400 (one day)</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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>The <code class="directive">CacheMaxExpire</code> directive specifies the maximum number of + seconds for which cacheable HTTP documents will be retained without checking the origin + server. Thus, documents will be out of date at most this number of seconds. This maximum + value is enforced even if an expiry date was supplied with the document.</p> + + <pre class="prettyprint lang-config">CacheMaxExpire 604800</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheMinExpire" id="CacheMinExpire">CacheMinExpire</a> <a name="cacheminexpire" id="cacheminexpire">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The minimum time in seconds to cache a document</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMinExpire <var>seconds</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMinExpire 0</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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>The <code class="directive">CacheMinExpire</code> directive specifies the minimum number of + seconds for which cacheable HTTP documents will be retained without checking the origin + server. This is only used if no valid expire time was supplied with the document.</p> + + + <pre class="prettyprint lang-config">CacheMinExpire 3600</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheQuickHandler" id="CacheQuickHandler">CacheQuickHandler</a> <a name="cachequickhandler" id="cachequickhandler">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Run the cache from the quick handler.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheQuickHandler <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheQuickHandler on</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</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_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Apache HTTP Server 2.3.3 and later</td></tr> +</table> + <p>The <code class="directive">CacheQuickHandler</code> directive + controls the phase in which the cache is handled.</p> + + <p>In the default enabled configuration, the cache operates within the quick + handler phase. This phase short circuits the majority of server processing, + and represents the most performant mode of operation for a typical server. + The cache <strong>bolts onto</strong> the front of the server, and the + majority of server processing is avoided.</p> + + <p>When disabled, the cache operates as a normal handler, and is subject to + the full set of phases when handling a server request. While this mode is + slower than the default, it allows the cache to be used in cases where full + processing is required, such as when content is subject to authorization.</p> + + <pre class="prettyprint lang-config"># Run cache as a normal handler +CacheQuickHandler off</pre> + + + <p>It is also possible, when the quick handler is disabled, for the + administrator to choose the precise location within the filter chain where + caching is to be performed, by adding the <strong>CACHE</strong> filter to + the chain.</p> + + <pre class="prettyprint lang-config"># Cache content before mod_include and mod_deflate +CacheQuickHandler off +AddOutputFilterByType CACHE;INCLUDES;DEFLATE text/html</pre> + + + <p>If the CACHE filter is specified more than once, the last instance will + apply.</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="CacheStaleOnError" id="CacheStaleOnError">CacheStaleOnError</a> <a name="cachestaleonerror" id="cachestaleonerror">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Serve stale content in place of 5xx responses.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheStaleOnError <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheStaleOnError on</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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibility:</a></th><td>Available in Apache 2.3.9 and later</td></tr> +</table> + <p>When the <code class="directive">CacheStaleOnError</code> directive + is switched on, and when stale data is available in the cache, the cache will + respond to 5xx responses from the backend by returning the stale data instead of + the 5xx response. While the Cache-Control headers sent by clients will be respected, + and the raw 5xx responses returned to the client on request, the 5xx response so + returned to the client will not invalidate the content in the cache.</p> + + <pre class="prettyprint lang-config"># Serve stale data on error. +CacheStaleOnError on</pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheStoreExpired" id="CacheStoreExpired">CacheStoreExpired</a> <a name="cachestoreexpired" id="cachestoreexpired">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Attempt to cache responses that the server reports as expired</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheStoreExpired On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheStoreExpired 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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Since httpd 2.2.4, responses which have already expired are not + stored in the cache. The <code class="directive">CacheStoreExpired</code> + directive allows this behavior to be overridden. + <code class="directive">CacheStoreExpired</code> On + tells the server to attempt to cache the resource if it is stale. + Subsequent requests would trigger an If-Modified-Since request of + the origin server, and the response may be fulfilled from cache + if the backend resource has not changed.</p> + + <pre class="prettyprint lang-config">CacheStoreExpired On</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheStoreNoStore" id="CacheStoreNoStore">CacheStoreNoStore</a> <a name="cachestorenostore" id="cachestorenostore">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Attempt to cache requests or responses that have been marked as no-store.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheStoreNoStore On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheStoreNoStore 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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Ordinarily, requests or responses with <code>Cache-Control: no-store</code> header + values will not be stored in the cache. The + <code class="directive">CacheStoreNoStore</code> directive allows this + behavior to be overridden. <code class="directive">CacheStoreNoStore</code> On + tells the server to attempt to cache the resource even if it contains + no-store header values. Resources requiring authorization will + <em>never</em> be cached.</p> + + <pre class="prettyprint lang-config">CacheStoreNoStore On</pre> + + + <div class="warning"><h3>Warning:</h3> + As described in RFC 2616, the no-store directive is intended to + "prevent the inadvertent release or retention of sensitive information + (for example, on backup tapes)." Enabling this option could store + sensitive information in the cache. You are hereby warned. + </div> + +<h3>See also</h3> +<ul> +<li><code class="directive"><a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></code></li> +<li><code class="directive"><a href="#cachestoreprivate">CacheStorePrivate</a></code></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheStorePrivate" id="CacheStorePrivate">CacheStorePrivate</a> <a name="cachestoreprivate" id="cachestoreprivate">Directive</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Attempt to cache responses that the server has marked as private</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheStorePrivate On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheStorePrivate 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#Status">Status:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Ordinarily, responses with <code>Cache-Control: private</code> header values will not + be stored in the cache. The <code class="directive">CacheStorePrivate</code> + directive allows this behavior to be overridden. + <code class="directive">CacheStorePrivate</code> On + tells the server to attempt to cache the resource even if it contains + private header values. Resources requiring authorization will + <em>never</em> be cached.</p> + + <pre class="prettyprint lang-config">CacheStorePrivate On</pre> + + + <div class="warning"><h3>Warning:</h3> + This directive will allow caching even if the upstream server has + requested that the resource not be cached. This directive is only + ideal for a 'private' cache. + </div> + +<h3>See also</h3> +<ul> +<li><code class="directive"><a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></code></li> +<li><code class="directive"><a href="#cachestorenostore">CacheStoreNoStore</a></code></li> +</ul> +</div> +</div> +<div class="bottomlang"> +<p><span>Available Languages: </span><a href="../en/mod/mod_cache.html" title="English"> en </a> | +<a href="../fr/mod/mod_cache.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | +<a href="../ja/mod/mod_cache.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../ko/mod/mod_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> +</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. 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\ No newline at end of file diff --git a/docs/manual/mod/mod_cache.html.fr.utf8 b/docs/manual/mod/mod_cache.html.fr.utf8 new file mode 100644 index 0000000..f38d24a --- /dev/null +++ b/docs/manual/mod/mod_cache.html.fr.utf8 @@ -0,0 +1,1187 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="fr" xml:lang="fr"><head> +<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_cache - Serveur HTTP Apache Version 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> +<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<body> +<div id="page-header"> +<p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossaire</a> | <a href="../sitemap.html">Plan du site</a></p> +<p class="apache">Serveur HTTP Apache Version 2.4</p> +<img alt="" src="../images/feather.png" /></div> +<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">Serveur HTTP</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div> +<div id="page-content"> +<div id="preamble"><h1>Module Apache mod_cache</h1> +<div class="toplang"> +<p><span>Langues Disponibles: </span><a href="../en/mod/mod_cache.html" hreflang="en" rel="alternate" title="English"> en </a> | +<a href="../fr/mod/mod_cache.html" title="Français"> fr </a> | +<a href="../ja/mod/mod_cache.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../ko/mod/mod_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> +</div> +<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Filtre de mise en cache HTTP conforme à la RFC 2616</td></tr> +<tr><th><a href="module-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="module-dict.html#ModuleIdentifier">Identificateur de Module:</a></th><td>cache_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">Fichier Source:</a></th><td>mod_cache.c</td></tr></table> +<h3>Sommaire</h3> + + <div class="warning">Ce module doit être utilisé avec précautions + car lorsque la directive <code class="directive"><a href="#cachequickhandler">CacheQuickHandler</a></code> est définie à sa + valeur par défaut <strong>on</strong>, les directives <code class="directive"><a href="../mod/mod_access_compat.html#allow">Allow</a></code> and <code class="directive"><a href="../mod/mod_access_compat.html#deny">Deny</a></code> sont court-circuitées. Vous + ne devez donc pas activer la gestion rapide de la mise en cache pour + un contenu auquel vous souhaitez limiter l'accès en fonction du nom + d'hôte du client, de l'adresse IP ou d'une variable + d'environnement.</div> + + <p><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> implémente un <strong>filtre de mise + en cache de contenu HTTP</strong> conforme à la <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a>, avec + support de la mise en cache des réponses dont le contenu a été + négocié et comportant l'en-tête Vary.</p> + + <p>La mise en cache conforme à la RFC 2616 fournit un mécanisme + permettant de vérifier si un contenu expiré ou dépassé est encore à + jour, et peut apporter un gain de performances significatif si le + serveur original supporte les <strong>requêtes + conditionnelles</strong> en prenant en compte l'en-tête de requête + HTTP <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.26">If-None-Match</a>. + Le contenu n'est ainsi régénéré que lorsqu'il a été modifié, et non + lorsqu'il a expiré.</p> + + <p>En tant que filtre, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> peut être placé + en face d'un contenu issu de tout gestionnaire, y compris + <strong>des fichiers à accès séquentiel</strong> (servis depuis un + disque lent mis en + cache sur un gros disque), la sortie d'un <strong>script + CGI</strong> ou d'un <strong>générateur de contenu + dynamique</strong>, ou du contenu <strong>mandaté depuis un autre + serveur</strong>.</p> + + <p>Dans la configuration par défaut, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> + place le filtre de mise en cache aussi loin que possible dans la + pile de filtres, utilisant le <strong>gestionnaire rapide</strong> + pour court-circuiter tout traitement par requête lors de l'envoi du + contenu au client. Dans ce mode opératoire, + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> peut être considéré comme un serveur + mandataire avec cache fixé en tête du serveur web, alors qu'il + s'exécute dans ce même serveur web.</p> + + <p>Lorsque le gestionnaire rapide est désactivé via la directive + <code class="directive"><a href="#cachequickhandler">CacheQuickHandler</a></code>, il + devient possible d'insérer le filtre <strong>CACHE</strong> à un + point de la pile de filtres choisi par l'administrateur. Ceci permet + de mettre en cache un contenu avant que celui-ci ne soit + personnalisé par le filtre <code class="module"><a href="../mod/mod_include.html">mod_include</a></code>, ou + éventuellement compressé par le filtre <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code>.</p> + + <p>Dans le mode de fonctionnement normal, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> + peut être contrôlé par les en-têtes <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9">Cache-Control</a> + et <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.32">Pragma</a> + envoyés par un client dans une requête, ou par un serveur dans une + réponse. Dans des circonstances exceptionnelles, + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> peut cependant être configuré pour + outrepasser ces en-têtes et forcer un comportement spécifique au + site, bien qu'un tel comportement sera limité à ce cache seulement, + et n'affectera pas les opérations des autres caches qui peuvent + s'insérer entre le client et le serveur, et ce type de configuration + ne doit donc être utiliser qu'en cas de nécessité absolue.</p> + + <p>La RFC 2616 permet au cache de renvoyer des données périmées + pendant que l'entrée périmée correspondante est mise à jour depuis + le serveur original, et <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> supporte cette + fonctionnalité lorsque la directive <code class="directive"><a href="#cachelock">CacheLock</a></code> est configurée en + conséquence. De telles réponses comportent un en-tête HTTP <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.46">Warning</a> + contenant un code de réponse 110. La RFC 2616 permet aussi au cache + de renvoyer des données périmées lorsque la tentative de mise à jour + des données périmées renvoie une erreur 500 ou supérieure, et cette + fonctionnalité est supportée par défaut par + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code>. De telles réponses comportent un en-tête HTTP <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.46">Warning</a> + contenant un code de réponse 111.</p> + + <p><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> requiert les services d'un ou + plusieurs modules de gestion de stockage. La distribution Apache de base + inclut les modules de gestion de stockage suivants :</p> + <dl> + <dt><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code></dt> + + <dd>implémente un gestionnaire de stockage sur disque. Les en-têtes + et corps sont stockés séparément sur le disque dans une structure de + répertoires basée sur le condensé md5 de l'URL mise en cache. + Plusieurs réponses à contenu négocié peuvent être stockées en même + temps, mais la mise en cache de contenus partiels n'est pas + supportée par ce module. L'utilitaire + <code class="program"><a href="../programs/htcacheclean.html">htcacheclean</a></code> permet de lister et de supprimer les + URLs mises en cache, et de maintenir le cache en deçà de + certaines limites de taille et de nombre d'inodes.</dd> + <dt><code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code></dt> + <dd>Implémente un gestionnaire de stockage basé sur un cache d'objets + partagés. Les en-têtes et corps sont stockés ensemble sous une seule + clé basée sur l'URL de la réponse mise en cache. Des réponses à + contenus multiples négociés peuvent être stockées simultanément, mais + ce module ne supporte pas la mise en cache de contenus partiels.</dd> + </dl> + + <p>Pour de plus amples détails, une description, et des exemples, + reportez-vous au <a href="../caching.html">Guide de la mise en + cache</a>.</p> +</div> +<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Sujets</h3> +<ul id="topics"> +<li><img alt="" src="../images/down.gif" /> <a href="#related">Modules apparentés et directives</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#sampleconf">Exemple de configuration</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#thunderingherd">Eviter une tempête de requête</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#finecontrol">Contrôle fin via le filtre CACHE</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#status">Etat du cache et journalisation</a></li> +</ul><h3 class="directives">Directives</h3> +<ul id="toc"> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedefaultexpire">CacheDefaultExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedetailheader">CacheDetailHeader</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedisable">CacheDisable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheenable">CacheEnable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheheader">CacheHeader</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreheaders">CacheIgnoreHeaders</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorenolastmod">CacheIgnoreNoLastMod</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorequerystring">CacheIgnoreQueryString</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreurlsessionidentifiers">CacheIgnoreURLSessionIdentifiers</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachekeybaseurl">CacheKeyBaseURL</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelastmodifiedfactor">CacheLastModifiedFactor</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelock">CacheLock</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelockmaxage">CacheLockMaxAge</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelockpath">CacheLockPath</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxexpire">CacheMaxExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheminexpire">CacheMinExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachequickhandler">CacheQuickHandler</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestaleonerror">CacheStaleOnError</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestoreexpired">CacheStoreExpired</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestorenostore">CacheStoreNoStore</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestoreprivate">CacheStorePrivate</a></li> +</ul> +<h3>Traitement des bugs</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">Journal des modifications de httpd</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_cache">Problèmes connus</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_cache">Signaler un bug</a></li></ul><h3>Voir aussi</h3> +<ul class="seealso"> +<li><a href="../caching.html">Guide de la mise en +cache</a></li> +<li><a href="#comments_section">Commentaires</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="related" id="related">Modules apparentés et directives</a></h2> + <table class="related"><tr><th>Modules Apparentés</th><th>Directives Apparentées</th></tr><tr><td><ul><li><code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/mod_cache_disk.html#cacheroot">CacheRoot</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachedirlevels">CacheDirLevels</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachedirlength">CacheDirLength</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cacheminfilesize">CacheMinFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachemaxfilesize">CacheMaxFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocache">CacheSocache</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachemaxtime">CacheSocacheMaxTime</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachemintime">CacheSocacheMinTime</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachemaxsize">CacheSocacheMaxSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachereadsize">CacheSocacheReadSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_socache.html#cachesocachereadtime">CacheSocacheReadTime</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">Exemple de configuration</a></h2> + <div class="example"><h3>Extrait de httpd.conf</h3><pre class="prettyprint lang-config"># +# Exemple de configuration du cache +# +LoadModule cache_module modules/mod_cache.so +<IfModule mod_cache.c> + LoadModule cache_disk_module modules/mod_cache_disk.so + <IfModule mod_cache_disk.c> + CacheRoot "c:/cacheroot" + CacheEnable disk "/" + CacheDirLevels 5 + CacheDirLength 3 + </IfModule> + + # Lorsqu'on sert de mandataire, on ne met pas en cache la liste +# des mises à jour de sécurité + CacheDisable "http://security.update.server/update-list/" +</IfModule></pre> +</div> +</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="thunderingherd" id="thunderingherd">Eviter une tempête de requête</a></h2> + <p>Lorsqu'une entrée du cache est périmée, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> + soumet une requête conditionnelle au processus d'arrière-plan, qui est + censé confirmer la validité de l'entrée du cache, ou dans la négative + envoyer une entrée mise à jour.</p> + <p>Un court mais non négligeable laps de temps existe entre le moment + où l'entrée du cache est périmée, et le moment où elle est mise à + jour. Sur un serveur fortement chargé, un certain nombre de requêtes + peut arriver pendant ce laps de temps, et provoquer une + <strong>tempête</strong> de requêtes susceptibles de saturer le + processus d'arrière-plan de manière soudaine et imprédictible.</p> + <p>Pour contenir cette tempête, on peut utiliser la directive <code class="directive"><a href="#cachelock">CacheLock</a></code> afin de définir un répertoire où + seront créés <strong>à la volée</strong> des verrous pour les URLs. Ces + verrous sont utilisés comme autant d'<strong>indications</strong> par les + autres requêtes, soit pour empêcher une tentative de mise en cache (un autre + processus est en train de récupérer l'entité), soit pour indiquer qu'une + entrée périmée est en cours de mise à jour (pendant ce temps, c'est le contenu + périmé qui sera renvoyé). + </p> + <h3>Mise en cache initiale d'une entrée</h3> + + <p>Lorsqu'une entité est mise en cache pour la première fois, un + verrou est créé pour cette entité jusqu'à ce que la réponse ait été + entièrement mise en cache. Pendant la durée de vie du verrou, le + cache va empêcher une seconde tentative de mise en cache de la même + entité. Bien que cela ne suffise pas à contenir la tempête de + requêtes, toute tentative de mettre en cache la même entité + plusieurs fois simultanément est stoppée. + </p> + + <h3>Mise à jour d'une entrée périmée</h3> + + <p>Lorsqu'une entrée atteint la limite de sa durée de vie, et + devient par conséquent périmée, un verrou est créé pour cette entité + jusqu'à ce que la réponse ait été soit confirmée comme encore + valide, soit remplacée par le processus d'arrière-plan. Pendant la + durée de vie du verrou, une seconde requête entrante va provoquer le + renvoi de la donnée périmée, et la tempête de requêtes sera + contenue.</p> + + <h3>Verrous et en-tête Cache-Control: no-cache</h3> + + <p>Les verrous ne sont utilisés <strong>qu'à titre + indicatif</strong> pour enjoindre le cache à être plus coopératif + avec les serveurs d'arrière-plan, et il est possible de passer outre + si nécessaire. Si le client envoie une requête contenant un en-tête + Cache-Control imposant un nouveau téléchargement de l'entité, tout + verrou éventuel sera ignoré, la requête du client sera honorée + immédiatement, et l'entrée du cache mise à jour.</p> + + <p>Comme mécanisme de sécurité supplémentaire, la durée de vie maximale des + verrous est configurable. Lorsque cette limite est atteinte, le verrou est + supprimé et une autre requête peut alors en créer un nouveau. Cette durée de + vie peut être définie via la directive <code class="directive"><a href="#cachemaxexpire">CacheMaxExpire</a></code>, et sa valeur par défaut est + de 5 secondes. + </p> + + <h3>Exemple de configuration</h3> + + <div class="example"><h3>Activation du verrouillage du cache</h3><pre class="prettyprint lang-config"># +# Active le verrouillage du cache +# +<IfModule mod_cache.c> + CacheLock on + CacheLockPath "/tmp/mod_cache-lock" + CacheLockMaxAge 5 +</IfModule></pre> +</div> + +</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="finecontrol" id="finecontrol">Contrôle fin via le filtre CACHE</a></h2> + <p>Dans son mode de fonctionnement par défaut, le cache s'exécute sous + la forme d'un gestionnaire rapide, court-circuitant la majorité des + traitements du serveur et fournissant ainsi une mise en cache + possédant les plus hautes performances disponibles.</p> + + <p>Dans ce mode, le cache <strong>s'incruste</strong> devant le + serveur, comme si un mandataire de mise en cache indépendant RFC 2616 + était placé devant ce dernier.</p> + + <p>Bien que que ce mode offre les meilleures performances, les + administrateurs peuvent souhaiter, dans certaines circonstances, + effectuer des traitements sur la requête après que cette dernière ait + été mise en cache, comme ajouter du contenu personnalisé à la page + mise en cache, ou appliquer des restrictions d'autorisations au + contenu. Pour y parvenir, l'administrateur sera alors souvent forcé de + placer des serveurs mandataires inverses indépendants soit derrière, + soit devant le serveur de mise en cache.</p> + + <p>Pour résoudre ce problème, la directive <code class="directive"><a href="#cachequickhandler">CacheQuickHandler</a></code> peut être définie à + <strong>off</strong>, afin que le serveur traite toutes les phases + normalement exécutées par une requête non mise en cache, y compris les + phases <strong>d'authentification et d'autorisation</strong>.</p> + + <p>En outre, l'administrateur peut éventuellement spécifier le + <strong>point précis dans la chaîne de filtrage</strong> où devra + intervenir la mise en cache en ajoutant le filtre + <strong>CACHE</strong> à la chaîne de filtrage en sortie.</p> + + <p>Par exemple, pour mettre en cache le contenu avant d'appliquer une + compression à la réponse, placez le filtre <strong>CACHE</strong> + avant le filtre <strong>DEFLATE</strong> comme dans l'exemple suivant + :</p> + + <pre class="prettyprint lang-config"># Mise en cache du contenu avant la compression optionnelle +CacheQuickHandler off +AddOutputFilterByType CACHE;DEFLATE text/plain</pre> + + + <p>Une autre possibilité consiste à mettre en cache le contenu avant + l'ajout de contenu personnalisé via <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> (ou + tout autre filtre de traitement de contenu). Dans l'exemple suivant, + les modèles contenant des balises comprises par + <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> sont mis en cache avant d'être + interprétés :</p> + + <pre class="prettyprint lang-config"># Mise en cache du contenu avant l'intervention de mod_include et + # mod_deflate +CacheQuickHandler off +AddOutputFilterByType CACHE;INCLUDES;DEFLATE text/html</pre> + + + <p>Vous pouvez insérer le filtre <strong>CACHE</strong> en tout point + de la chaîne de filtrage. Dans l'exemple suivant, le contenu est mis + en cache après avoir été interprété par <code class="module"><a href="../mod/mod_include.html">mod_include</a></code>, + mais avant d'être traité par <code class="module"><a href="../mod/mod_deflate.html">mod_deflate</a></code> :</p> + + <pre class="prettyprint lang-config"># Mise en cache du contenu entre les interventions de mod_include et + # mod_deflate +CacheQuickHandler off +AddOutputFilterByType INCLUDES;CACHE;DEFLATE text/html</pre> + + + <div class="warning"><h3>Avertissement :</h3>Si pour une raison + ou pour une autre, le point d'insertion du filtre + <strong>CACHE</strong> dans la chaîne de filtrage est modifié, vous + devez <strong>vider votre cache</strong> pour être sûr que les données + servies soient à jour. En effet, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> n'est pas + en mesure d'effectuer cette opération à votre place.</div> + +</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="section"> +<h2><a name="status" id="status">Etat du cache et journalisation</a></h2> + <p>Lorsque <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> a décidé s'il devait ou non + servir une entité depuis le cache, les raisons précises de cette + décision sont enregistrées dans l'environnement du sous-processus + interne à la requête sous la clé <strong>cache-status</strong>. + Cette information peut être journalisée via la directive <code class="directive"><a href="../mod/mod_log_config.html#logformat">LogFormat</a></code> comme suit :</p> + + <pre class="prettyprint lang-config">LogFormat "%{cache-status}e ..."</pre> + + + <p>En fonction de la décision prise, l'information est aussi écrite + dans l'environnement du sous-processus sous une des quatre clés + suivantes :</p> + + <dl> + <dt>cache-hit</dt><dd>Le contenu a été servi depuis le cache.</dd> + <dt>cache-revalidate</dt><dd>Le contenu du cache était périmé, a été + mis à jour avec succès, puis servi depuis le cache.</dd> + <dt>cache-miss</dt><dd>Le contenu n'était pas dans le cache et a été + servi directement depuis le serveur demandé.</dd> + <dt>cache-invalidate</dt><dd>L'entité du cache est devenue invalide + suite à une requête d'un type autre que GET ou HEAD.</dd> + </dl> + + <p>Il est alors possible d'envisager une journalisation conditionnelle + du traitement des requêtes par rapport au cache comme dans l'exemple + suivant :</p> + + <pre class="prettyprint lang-config">CustomLog "cached-requests.log" common env=cache-hit +CustomLog "uncached-requests.log" common env=cache-miss +CustomLog "revalidated-requests.log" common env=cache-revalidate +CustomLog "invalidated-requests.log" common env=cache-invalidate</pre> + + + <p>Pour les concepteurs de modules, une accroche (hook) nommée + <var>cache_status</var> est disponible et permet aux modules de + répondre aux résultats de la vérification du cache ci-dessus de manière + personnalisée.</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="cachedefaultexpire" id="cachedefaultexpire">Directive</a> <a name="CacheDefaultExpire" id="CacheDefaultExpire">CacheDefaultExpire</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>La durée par défaut de mise en cache d'un document +lorsqu'aucune date d'expiration n'a été spécifiée.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheDefaultExpire <var>secondes</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheDefaultExpire 3600 (une heure)</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>La directive <code class="directive">CacheDefaultExpire</code> permet de + spécifier un temps par défaut, en secondes, pendant lequel sera conservé + dans le cache un document qui ne possède ni date d'expiration, ni date de + dernière modification. La valeur de cette directive n'est <em>pas</em> + écrasée par la valeur de la directive <code class="directive"><a href="#cachemaxexpire">CacheMaxExpire</a></code>, même si cette dernière est + utilisée.</p> + + <pre class="prettyprint lang-config">CacheDefaultExpire 86400</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cachedetailheader" id="cachedetailheader">Directive</a> <a name="CacheDetailHeader" id="CacheDetailHeader">CacheDetailHeader</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ajoute un en-tête X-Cache-Detail à la réponse.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheDetailHeader <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheDetailHeader off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibilité:</a></th><td>Disponible depuis la version 2.3.9 d'Apache</td></tr> +</table> + <p>Lorsque la directive <code class="directive">CacheDetailHeader</code> est définie à + on, un en-tête <strong>X-Cache-Detail</strong> est ajouté à la réponse et + contient les raisons précises d'une décision d'utilisation du cache vis à vis + de cette dernière.</p> + + <p>Ceci peut s'avérer utile au cours du développement de services + RESTful mis en cache pour obtenir des informations supplémentaires à + propos des décisions vis à vis du cache écrites dans les en-têtes de + la réponse. Il est ainsi possible de vérifier si + <code>Cache-Control</code> et d'autres en-têtes ont été correctement + utilisés par le service et le client.</p> + + <p>Si le gestionnaire normal est utilisé, cette directive peut se situer dans + une section <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> ou + <code class="directive"><a href="../mod/core.html#location"><Location></a></code>. Si c'est le + gestionnaire rapide qui est utilisé, elle doit se situer dans un contexte de + serveur principal ou de serveur virtuel, sinon elle sera ignorée.</p> + + <pre class="prettyprint lang-config"># Active l'en-tête X-Cache-Detail +CacheDetailHeader on</pre> + + + <div class="example"><p><code> + X-Cache-Detail: "conditional cache hit: entity refreshed" from localhost<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="cachedisable" id="cachedisable">Directive</a> <a name="CacheDisable" id="CacheDisable">CacheDisable</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Désactive la mise en cache des URLs +spécifiées</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheDisable <var>chaîne-url</var> | <var>on</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>La directive <code class="directive">CacheDisable</code> enjoint + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> de <em>ne pas</em> mettre en cache l'URL + spécifiée par <var>chaîne URL</var>, ainsi que les URLs de niveaux + inférieurs.</p> + + <div class="example"><h3>Exemple</h3><pre class="prettyprint lang-config">CacheDisable "/fichiers_locaux"</pre> +</div> + + <p>Si la directive se trouve à l'intérieur d'une section <code class="directive"><a href="../mod/core.html#location"><Location></a></code>, le chemin doit être + spécifié en dessous de la Location, et si le mot "on" est utilisé, la mise + en cache sera désactivée pour l'ensemble de l'arborescence concernée par la + section Location.</p> + + <div class="example"><h3>Exemple</h3><pre class="prettyprint lang-config"><Location "/foo"> + CacheDisable on +</Location></pre> +</div> + + <p>Avec les versions 2.2.12 et ultérieures, on peut définir la + variable d'environnement <code>no-cache</code> pour une définition + plus fine des ressources à mettre en cache.</p> + +<h3>Voir aussi</h3> +<ul> +<li><a href="../env.html">Les variables d'environnement dans +Apache</a></li> +</ul> +</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">Directive</a> <a name="CacheEnable" id="CacheEnable">CacheEnable</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Active la mise en cache des URLs spécifiées en utilisant le +gestionnaire de stockage précisé</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheEnable <var>type de cache</var> [<var>chaîne +URL</var>]</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibilité:</a></th><td>Une chaîne URL telle que '/' s'appliquait à tout contenu +en mandat direct dans les versions 2.2 et antérieures.</td></tr> +</table> + <p>La directive <code class="directive">CacheEnable</code> enjoint + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> de mettre en cache l'URL précisée par + <var>chaîne URL</var>, ainsi que les URLs de niveaux inférieurs. Le + gestionnaire de stockage du cache est spécifié à l'aide de l'argument + <var>type de cache</var>. La directive <code class="directive">CacheEnable</code> + peut être placée à l'intérieur d'une section <code class="directive"><a href="../mod/core.html#location"><Location></a></code> ou <code class="directive"><a href="../mod/core.html#locationmatch"><LocationMatch></a></code> pour indiquer que le contenu + considéré peut être mis en cache. Si <var>type de cache</var> a pour valeur + <code>disk</code>, <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> utilisera le gestionnaire de + stockage sur disque implémenté par + <code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code>. Pour que <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> + utilise le gestionnaire de stockage basé sur le cache d'objets + partagés implémenté par <code class="module"><a href="../mod/mod_cache_socache.html">mod_cache_socache</a></code>, + spécifiez <code>socache</code> comme valeur du paramètre <var>type + de cache</var>.</p> + <p>Si les différentes directives <code class="directive">CacheEnable</code> + spécifient des URLs qui se recoupent (comme dans l'exemple + ci-dessous), tous les gestionnaires de stockage possibles seront + lancés, jusqu'au premier d'entre eux qui traitera effectivement la + requête. + L'ordre dans lequel les gestionnaires de stockage sont lancés est déterminé + par l'ordre dans lequel apparaissent les directives + <code class="directive">CacheEnable</code> dans le fichier de configuration. Les + directives <code class="directive">CacheEnable</code> situées à l'intérieur de + sections <code class="directive"><a href="../mod/core.html#location"><Location></a></code> ou + <code class="directive"><a href="../mod/core.html#locationmatch"><LocationMatch></a></code> sont + traitées avant les directives <code class="directive">CacheEnable</code> définies au + niveau global.</p> + + <p>En fonctionnement du type serveur mandataire direct, <var>chaîne + URL</var> doit au moins débuter par un protocole pour lequel la mise + en cache doit être activée.</p> + + <pre class="prettyprint lang-config"># Mise en cache de contenu (gestionnaire normal seulement) +CacheQuickHandler off +<Location "/foo"> + CacheEnable disk +</Location> + +# Mise en cache via une expression rationnelle (gestionnaire normal seulement) +CacheQuickHandler off +<LocationMatch "foo$"> + CacheEnable disk +</LocationMatch> + +# Mise en cache de tous les contenus, à l'exception des URLs +# mandatées en direct (gestionnaire normal ou rapide) +CacheEnable disk / + +# Mise en cache des URLs FTP mandatées (gestionnaire normal ou rapide) +CacheEnable disk ftp:// + +# Mise en cache des contenus mandatés en direct depuis www.example.org (gestionnaire normal ou rapide) +CacheEnable disk http://www.example.org/</pre> + + + <p>Un nom d'hôte commençant par un caractère <strong>"*"</strong> + correspondra à tout nom d'hôte se terminant par le suffixe + considéré. Un nom d'hôte commençant par un caractère + <strong>"."</strong> correspondra à tout nom d'hôte contenant le + composant de nom de domaine qui suit ce caractère.</p> + + <pre class="prettyprint lang-config"># Correspond à www.example.org et fooexample.org +CacheEnable disk "http://*example.org/" +# Correspond à www.example.org, mais pas à fooexample.org +CacheEnable disk "http://.example.org/"</pre> + + + <p>Depuis la version 2.2.12, on peut définir la variable + d'environnement <code>no-cache</code> pour une définition plus fine + des ressources à mettre en cache.</p> + + +<h3>Voir aussi</h3> +<ul> +<li><a href="../env.html">Les variables d'environnement dans +Apache</a></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cacheheader" id="cacheheader">Directive</a> <a name="CacheHeader" id="CacheHeader">CacheHeader</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ajoute un en-tête X-Cache à la réponse.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheHeader <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheHeader off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibilité:</a></th><td>Disponible depuis la version 2.3.9 d'Apache</td></tr> +</table> + <p>Lorsque la directive <code class="directive">CacheHeader</code> est définie à on, un + en-tête <strong>X-Cache</strong> est ajouté à la réponse et contient + l'état du cache pour cette dernière. Si le gestionnaire normal est + utilisé, cette directive peut se situer dans une section + <code class="directive"><a href="../mod/core.html#directory"><Directory></a></code> ou + <code class="directive"><a href="../mod/core.html#location"><Location></a></code>. Si c'est + le gestionnaire rapide qui est utilisé, elle doit se situer dans un + contexte de serveur principal ou de serveur virtuel, sinon elle sera + ignorée.</p> + + <dl> + <dt><strong>HIT</strong></dt><dd>Le contenu était à jour et a été + servi depuis le cache.</dd> + <dt><strong>REVALIDATE</strong></dt><dd>Le contenu était périmé, a + été mis à jour, puis a été servi depuis le cache.</dd> + <dt><strong>MISS</strong></dt><dd>Le contenu n'a pas été servi + depuis le cache, mais directement depuis le serveur demandé.</dd> + </dl> + + <pre class="prettyprint lang-config"># Active l'en-tête X-Cache +CacheHeader on</pre> + + + <pre class="prettyprint lang-config">X-Cache: HIT from localhost</pre> + + + + +</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">Directive</a> <a name="CacheIgnoreCacheControl" id="CacheIgnoreCacheControl">CacheIgnoreCacheControl</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore les en-têtes de requête enjoignant de ne pas servir +le contenu au client depuis le cache</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheIgnoreCacheControl On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheIgnoreCacheControl Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Normalement, les requêtes contenant des en-têtes tels que + <code>Cache-Control: no-cache</code> ou Pragma: no-cache ne sont pas + servies depuis le cache. La directive + <code class="directive">CacheIgnoreCacheControl</code> permet de modifier ce + comportement. Avec <code class="directive">CacheIgnoreCacheControl + On</code>, le serveur tentera de servir la ressource depuis le + cache, même si la requête contient un des en-têtes cités plus haut. + Les ressources qui requièrent une autorisation ne seront + <em>jamais</em> mises en cache.</p> + + <pre class="prettyprint lang-config">CacheIgnoreCacheControl On</pre> + + + <div class="warning"><h3>Avertissement :</h3> + Cette directive permet de servir des ressources depuis le cache, + même si le client a demandé à ce qu'il n'en soit pas ainsi. Le + contenu servi est ainsi susceptible d'être périmé. + </div> + +<h3>Voir aussi</h3> +<ul> +<li><code class="directive"><a href="#cachestoreprivate">CacheStorePrivate</a></code></li> +<li><code class="directive"><a href="#cachestorenostore">CacheStoreNoStore</a></code></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cacheignoreheaders" id="cacheignoreheaders">Directive</a> <a name="CacheIgnoreHeaders" id="CacheIgnoreHeaders">CacheIgnoreHeaders</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ne pas stocker le(s) en-tête(s) spécifié(s) dans le cache. +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheIgnoreHeaders <var>en-tête</var> [<var>en-tête</var>] ...</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheIgnoreHeaders None</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>En accord avec la RFC 2616, les en-têtes HTTP hop-by-hop ne sont + pas stockés dans le cache. Les en-têtes HTTP suivant sont des + en-têtes hop-by-hop, et en tant que tels, ne sont en <em>aucun</em> + cas stockés dans le cache, quelle que soit la définition de la + directive <code class="directive">CacheIgnoreHeaders</code> :</p> + + <ul> + <li><code>Connection</code></li> + <li><code>Keep-Alive</code></li> + <li><code>Proxy-Authenticate</code></li> + <li><code>Proxy-Authorization</code></li> + <li><code>TE</code></li> + <li><code>Trailers</code></li> + <li><code>Transfer-Encoding</code></li> + <li><code>Upgrade</code></li> + </ul> + + <p>La directive <code class="directive">CacheIgnoreHeaders</code> permet de + spécifier quels en-têtes HTTP ne doivent pas être stockés dans le + cache. Par exemple, il peut s'avérer pertinent dans certains cas de + ne pas stocker les cookies dans le cache.</p> + + <p>La directive <code class="directive">CacheIgnoreHeaders</code> accepte + une liste d'en-têtes HTTP séparés par des espaces, qui ne doivent + pas être stockés dans le cache. Si les en-têtes hop-by-hop sont les + seuls à ne pas devoir être stockés dans le cache (le comportement + compatible RFC 2616), la directive + <code class="directive">CacheIgnoreHeaders</code> peut être définie à + <code>None</code>.</p> + + <div class="example"><h3>Exemple 1</h3><pre class="prettyprint lang-config">CacheIgnoreHeaders Set-Cookie</pre> +</div> + + <div class="example"><h3>Exemple 2</h3><pre class="prettyprint lang-config">CacheIgnoreHeaders None</pre> +</div> + + <div class="warning"><h3>Avertissement :</h3> + Si des en-têtes nécessaires à la bonne gestion du cache, comme + <code>Expires</code>, ne sont pas stockés suite à la définition + d'une directive <code class="directive">CacheIgnoreHeaders</code>, le + comportement de mod_cache sera imprévisible. + </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="cacheignorenolastmod" id="cacheignorenolastmod">Directive</a> <a name="CacheIgnoreNoLastMod" id="CacheIgnoreNoLastMod">CacheIgnoreNoLastMod</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore le fait qu'une réponse ne possède pas d'en-tête Last +Modified.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheIgnoreNoLastMod On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheIgnoreNoLastMod Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Normalement, les documents qui ne possèdent pas de date de + dernière modification ne sont pas mis en cache. Dans certaines + circonstances, la date de dernière modification est supprimée (au + cours des traitements liés à <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> par + exemple), ou n'existe tout simplement pas. La directive + <code class="directive">CacheIgnoreNoLastMod</code> permet de spécifier si + les documents ne possèdant pas de date de dernière modification doivent être + mis en cache, même sans date de dernière modification. Si le document ne + possède ni date d'expiration, ni date de dernière modification, la valeur + spécifiée par la directive <code class="directive"><a href="#cachedefaultexpire">CacheDefaultExpire</a></code> servira à générer une date + d'expiration. + </p> + + <pre class="prettyprint lang-config">CacheIgnoreNoLastMod On</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cacheignorequerystring" id="cacheignorequerystring">Directive</a> <a name="CacheIgnoreQueryString" id="CacheIgnoreQueryString">CacheIgnoreQueryString</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore la chaîne de paramètres lors de la mise en +cache</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheIgnoreQueryString On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheIgnoreQueryString Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Normalement, les requêtes comportant une chaîne de paramètres + sont mises en cache séparément si leurs chaînes de paramètres + diffèrent. + En accord avec la RFC 2616/13.9, cette mise en cache n'est effectuée + séparément que si une date d'expiration est spécifiée. La directive + <code class="directive">CacheIgnoreQueryString</code> permet la mise en + cache de requêtes même si aucune date d'expiration est spécifiée, et + de renvoyer une réponse depuis la cache même si les chaînes de + paramètres diffèrent. Du point de vue du cache, la requête est + traitée comme si elle ne possèdait pas de chaîne de paramètres + lorsque cette directive est activée.</p> + + <pre class="prettyprint lang-config">CacheIgnoreQueryString On</pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cacheignoreurlsessionidentifiers" id="cacheignoreurlsessionidentifiers">Directive</a> <a name="CacheIgnoreURLSessionIdentifiers" id="CacheIgnoreURLSessionIdentifiers">CacheIgnoreURLSessionIdentifiers</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore les identifiants de session définis encodés dans +l'URL lors de la mise en cache +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheIgnoreURLSessionIdentifiers <var>identifiant</var> +[<var>identifiant</var>] ...</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheIgnoreURLSessionIdentifiers None</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Certaines applications encodent l'identifiant de session dans + l'URL comme dans l'exemple suivant : + </p> + <ul> + <li><code>/une-application/image.gif;jsessionid=123456789</code></li> + <li><code>/une-application/image.gif?PHPSESSIONID=12345678</code></li> + </ul> + <p>Ceci implique la mise en cache des ressources séparément pour + chaque session, ce qui n'est en général pas souhaité. La directive + <code class="directive">CacheIgnoreURLSessionIdentifiers</code> permet de + définir une liste d'identifiants qui seront supprimés de la clé + utilisée pour identifier une entité dans le cache, de façon à ce que + les ressources ne soient pas stockées séparément pour chaque + session. + </p> + <p><code>CacheIgnoreURLSessionIdentifiers None</code> vide la liste + des identifiants ignorés. Autrement, chaque identifiant spécifié est + ajouté à la liste.</p> + + <div class="example"><h3>Exemple 1</h3><pre class="prettyprint lang-config">CacheIgnoreURLSessionIdentifiers jsessionid</pre> +</div> + + <div class="example"><h3>Exemple 2</h3><pre class="prettyprint lang-config">CacheIgnoreURLSessionIdentifiers None</pre> +</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="cachekeybaseurl" id="cachekeybaseurl">Directive</a> <a name="CacheKeyBaseURL" id="CacheKeyBaseURL">CacheKeyBaseURL</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Remplace l'URL de base des clés du cache mandatées en +inverse</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheKeyBaseURL <var>URL</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibilité:</a></th><td>Disponible depuis la version 2.3.9 d'Apache</td></tr> +</table> + <p>Lorsque la directive <code class="directive">CacheKeyBaseURL</code> est utilisée, + l'URL spécifiée sera utilisée comme URL de base pour calculer l'URL des clés + du cache dans la configuration du mandataire inverse. Par défaut, c'est le + protocole/nom d'hôte/port du serveur virtuel courant qui sera utilisé pour + construire la clé de cache. Dans le cas d'un cluster de machines, si toutes + les entrées du cache doivent posséder la même clé, cette directive permet de + spécifier une nouvelle URL de base.</p> + + <pre class="prettyprint lang-config"># Remplace l'URL de base de la clé de cache. +CacheKeyBaseURL "http://www.example.com/"</pre> + + + <div class="warning">Prenez garde en définissant cette directive. Si + deux serveurs virtuels distincts possèdent accidentellement la même + URL de base, les entrées en provenance d'un serveur virtuel seront + servies par l'autre.</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="cachelastmodifiedfactor" id="cachelastmodifiedfactor">Directive</a> <a name="CacheLastModifiedFactor" id="CacheLastModifiedFactor">CacheLastModifiedFactor</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Le facteur utilisé pour générer une date d'expiration en +fonction de la date de dernière modification.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheLastModifiedFactor <var>flottant</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheLastModifiedFactor 0.1</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Si un document ne possède pas de date d'expiration, elle peut + être calculée en fonction de la date de dernière modification, si + elle existe. La directive + <code class="directive">CacheLastModifiedFactor</code> permet de spécifier + un <var>facteur</var> à utiliser pour la génération de cette date + d'expiration au sein de la formule suivante : + + <code>délai-expiration = durée-depuis-date-dernière-modification * + <var>facteur</var> + date-expiration = date-courante + délai-expiration</code> + + Par exemple, si la dernière modification du document date de 10 + heures, et si <var>facteur</var> a pour valeur 0.1, le délai + d'expiration sera de 10*0.1 = 1 heure. Si l'heure courante est + 3:00pm, la date d'expiration calculée sera 3:00pm + 1 heure = + 4:00pm. + + Si le délai d'expiration est supérieur à celui spécifié par la directive + <code class="directive"><a href="#cachemaxexpire">CacheMaxExpire</a></code>, c'est ce dernier + qui l'emporte.</p> + + <pre class="prettyprint lang-config">CacheLastModifiedFactor 0.5</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cachelock" id="cachelock">Directive</a> <a name="CacheLock" id="CacheLock">CacheLock</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Active la protection contre les tempêtes de requêtes.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheLock <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheLock off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibilité:</a></th><td>Disponible depuis la version 2.2.15 d'Apache</td></tr> +</table> + <p>La directive <code class="directive">CacheLock</code> active la protection + contre les tempêtes de requêtes pour l'espace d'adressage donné.</p> + + <p>La configuration minimale pour activer le verrouillage contre les + tempêtes de requêtes dans le répertoire temp par défaut du système est + la suivante :</p> + + <pre class="prettyprint lang-config"># Active le verrouillage du cache +CacheLock on</pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cachelockmaxage" id="cachelockmaxage">Directive</a> <a name="CacheLockMaxAge" id="CacheLockMaxAge">CacheLockMaxAge</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Définit la durée de vie maximale d'un verrou de cache.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheLockMaxAge <var>entier</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheLockMaxAge 5</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>La directive <code class="directive">CacheLockMaxAge</code> permet de + spécifier la durée de vie maximale d'un verrou de cache.</p> + + <p>Un verrou plus ancien que cette valeur exprimée en secondes sera + ignoré, et la prochaine requête entrante sera alors en mesure de + recréer le verrou. Ce mécanisme permet d'éviter les mises à jour trop + longues initiées par des clients lents.</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="cachelockpath" id="cachelockpath">Directive</a> <a name="CacheLockPath" id="CacheLockPath">CacheLockPath</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Définit le répertoire des verrous.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheLockPath <var>répertoire</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheLockPath /tmp/mod_cache-lock</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>La directive <code class="directive">CacheLockPath</code> permet de + spécifier le répertoire dans lequel les verrous sont créés. Par + défaut, c'est le répertoire temporaire du système qui est utilisé. Les + verrous sont des fichiers vides qui n'existent que pour les URLs + périmées en cours de mise à jour, et consomment donc bien moins de + ressources que le traditionnel cache sur disque.</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="cachemaxexpire" id="cachemaxexpire">Directive</a> <a name="CacheMaxExpire" id="CacheMaxExpire">CacheMaxExpire</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>La durée maximale en secondes de mise en cache d'un +document</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheMaxExpire <var>secondes</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheMaxExpire 86400 (une journée)</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>La directive <code class="directive">CacheMaxExpire</code> permet de + spécifier le nombre maximum de secondes pendant lequel les documents + HTTP suceptibles d'être mis en cache seront conservés sans vérifier + leur contenu sur le serveur d'origine. Ce nombre de secondes + correspond donc à la durée maximale pendant laquelle un document ne + sera pas à jour. L'utilisation de cette valeur maximale est forcée, + même si le document possède une date d'expiration.</p> + + <pre class="prettyprint lang-config">CacheMaxExpire 604800</pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cacheminexpire" id="cacheminexpire">Directive</a> <a name="CacheMinExpire" id="CacheMinExpire">CacheMinExpire</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>La durée minimale en secondes de mise en cache d'un +document</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheMinExpire <var>secondes</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheMinExpire 0</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>La directive <code class="directive">CacheMinExpire</code> permet de + spécifier le nombre minimum de secondes pendant lequel les documents + HTTP susceptibles d'être mis en cache seront conservés sans vérifier + leur contenu sur le serveur d'origine. Elle n'est prise en compte + que dans le cas où le document ne possède aucune date d'expiration + valide.</p> + + <pre class="prettyprint lang-config">CacheMinExpire 3600</pre> + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cachequickhandler" id="cachequickhandler">Directive</a> <a name="CacheQuickHandler" id="CacheQuickHandler">CacheQuickHandler</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Exécute le cache à partir d'un gestionnaire rapide.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheQuickHandler <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheQuickHandler on</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibilité:</a></th><td>Disponible à partir de la version 2.3.3 du serveur HTTP + Apache</td></tr> +</table> + <p>La directive <code class="directive">CacheQuickHandler</code> permet de contrôler + la phase au cours de laquelle la mise en cache est effectuée.</p> + + <p>Avec la configuration par défaut, le cache agit au cours de la + phase du gestionnaire rapide. Cette phase court-circuite la majorité + des traitements du serveur, et constitue le mode d'opération le plus + performant pour un serveur typique. Le cache + <strong>s'incruste</strong> devant le serveur, et la majorité des + traitements du serveur est court-circuitée.</p> + + <p>Lorsque cette directive est définie à off, le cache agit comme un + gestionnaire normal, et est concerné par toutes les phases de + traitement d'une requête. Bien que ce mode soit moins performant que + le mode par défaut, il permet d'utiliser le cache dans les cas où un + traitement complet de la requête est nécessaire, comme par exemple + lorsque le contenu est soumis à autorisation.</p> + + <pre class="prettyprint lang-config"># Exécute le cache comme un gestionnaire normal +CacheQuickHandler off</pre> + + + <p>Lorsque le gestionnaire rapide est désactivé, l'administrateur a + aussi la possibilité de choisir avec précision le point de la chaîne + de filtrage où la mise en cache sera effectuée, en utilisant le + filtre <strong>CACHE</strong>.</p> + + <pre class="prettyprint lang-config"># Mise en cache du contenu avant l'intervention de mod_include et + # mod_deflate +CacheQuickHandler off +AddOutputFilterByType CACHE;INCLUDES;DEFLATE text/html</pre> + + + <p>Si le filtre CACHE est spécifié plusieurs fois, c'est la dernière + instance qui sera prise en compte.</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="cachestaleonerror" id="cachestaleonerror">Directive</a> <a name="CacheStaleOnError" id="CacheStaleOnError">CacheStaleOnError</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Sert du contenu non à jour à la place de réponses 5xx.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheStaleOnError <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheStaleOnError on</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">Compatibilité:</a></th><td>Disponible depuis la version 2.3.9 d'Apache</td></tr> +</table> + <p>Lorsque la directive <code class="directive">CacheStaleOnError</code> est définie à + on, et si des données non mises à jour sont disponibles dans le cache, ce + dernier renverra ces données, plutôt qu'une éventuelle réponse 5xx en + provenance du serveur d'arrière-plan. Alors que l'en-tête Cache-Control envoyé + par les clients sera respecté, et que les clients recevront donc dans ce cas + la réponse 5xx brute à leur requête, cette réponse 5xx renvoyée au client + n'invalidera pas le contenu dans le cache.</p> + + <pre class="prettyprint lang-config"># Sert des données non mises à jour en cas d'erreur. +CacheStaleOnError on</pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cachestoreexpired" id="cachestoreexpired">Directive</a> <a name="CacheStoreExpired" id="CacheStoreExpired">CacheStoreExpired</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Tente de mettre en cache les réponses que le serveur +considère comme arrivées à expiration</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheStoreExpired On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheStoreExpired Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Depuis la version 2.2.4, les réponses qui sont arrivées à + expiration ne sont pas stockées dans le cache. La directive + <code class="directive">CacheStoreExpired</code> permet de modifier ce + comportement. Avec <code class="directive">CacheStoreExpired</code> On, le + serveur tente de mettre en cache la ressource si elle est périmée. + Les requêtes suivantes vont déclencher une requête si-modifié-depuis + de la part du serveur d'origine, et la réponse sera renvoyée à + partir du cache si la ressource d'arrière-plan n'a pas été modifiée.</p> + + <pre class="prettyprint lang-config">CacheStoreExpired On</pre> + + + +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cachestorenostore" id="cachestorenostore">Directive</a> <a name="CacheStoreNoStore" id="CacheStoreNoStore">CacheStoreNoStore</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Tente de mettre en cache les requêtes ou réponses dont +l'entête Cache-Control: a pour valeur no-store.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheStoreNoStore On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheStoreNoStore Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Normalement, les requêtes ou réponses dont l'en-tête + <code>Cache-Control: no-store</code> ne sont pas stockées dans le + cache. La directive <code class="directive">CacheStoreNoStore</code> permet + de modifier ce comportement. Si + <code class="directive">CacheStoreNoStore</code> est définie à On, le + serveur tente de mettre la ressource en cache même si elle contient + des en-têtes ayant pour valeur no-store. Les ressources + nécessitant une autorisation ne sont <em>jamais</em> mises en + cache.</p> + + + <pre class="prettyprint lang-config">CacheStoreNoStore On</pre> + + + + <div class="warning"><h3>Avertissement :</h3> + Selon la RFC 2616, la valeur d'en-tête no-store est censée + "prévenir la suppression ou la rétention par inadvertance + d'informations sensibles (par exemple, sur des bandes de + sauvegarde)". Autrement dit, l'activation de la directive + <code class="directive">CacheStoreNoCache</code> pourrait provoquer le + stockage d'informations sensibles dans le cache. Vous avez donc + été prévenus. + </div> + +<h3>Voir aussi</h3> +<ul> +<li><code class="directive"><a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></code></li> +<li><code class="directive"><a href="#cachestoreprivate">CacheStorePrivate</a></code></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="cachestoreprivate" id="cachestoreprivate">Directive</a> <a name="CacheStorePrivate" id="CacheStorePrivate">CacheStorePrivate</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Tente de mettre en cache des réponses que le serveur a +marquées comme privées</td></tr> +<tr><th><a href="directive-dict.html#Syntax">Syntaxe:</a></th><td><code>CacheStorePrivate On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">Défaut:</a></th><td><code>CacheStorePrivate Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">Contexte:</a></th><td>configuration globale, serveur virtuel, répertoire, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">Statut:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr> +</table> + <p>Normalement, les réponse comportant un en-tête <code>Cache-Control: + private</code> ne seront pas stockées dans le cache. La directive + <code class="directive">CacheStorePrivate</code> permet de modifier ce comportement. + Si <code class="directive">CacheStorePrivate</code> est définie à On, le serveur + tentera de mettre la ressource en cache, même si elle + contient des en-têtes ayant pour valeur private. Les ressources + nécessitant une autorisation ne sont <em>jamais</em> mises en + cache.</p> + + + <pre class="prettyprint lang-config">CacheStorePrivate On</pre> + + + + <div class="warning"><h3>Avertissement :</h3> + Cette directive autorise la mise en cache même si le serveur + indique que la ressource ne doit pas être mise en cache. Elle + n'est de ce fait appropriée que dans le cas d'un cache + 'privé'. + </div> + +<h3>Voir aussi</h3> +<ul> +<li><code class="directive"><a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></code></li> +<li><code class="directive"><a href="#cachestorenostore">CacheStoreNoStore</a></code></li> +</ul> +</div> +</div> +<div class="bottomlang"> +<p><span>Langues Disponibles: </span><a href="../en/mod/mod_cache.html" hreflang="en" rel="alternate" title="English"> en </a> | +<a href="../fr/mod/mod_cache.html" title="Français"> fr </a> | +<a href="../ja/mod/mod_cache.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../ko/mod/mod_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> +</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Commentaires</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div> +<script type="text/javascript"><!--//--><![CDATA[//><!-- +var comments_shortname = 'httpd'; +var comments_identifier = 'http://httpd.apache.org/docs/2.4/mod/mod_cache.html'; +(function(w, d) { + if (w.location.hostname.toLowerCase() == "httpd.apache.org") { + d.write('<div id="comments_thread"><\/div>'); + var s = d.createElement('script'); + s.type = 'text/javascript'; + s.async = true; + s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier; + (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s); + } + else { + d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>'); + } +})(window, document); +//--><!]]></script></div><div id="footer"> +<p class="apache">Copyright 2023 The Apache Software Foundation.<br />Autorisé sous <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="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossaire</a> | <a href="../sitemap.html">Plan du site</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!-- +if (typeof(prettyPrint) !== 'undefined') { + prettyPrint(); +} +//--><!]]></script> +</body></html>
\ No newline at end of file diff --git a/docs/manual/mod/mod_cache.html.ja.utf8 b/docs/manual/mod/mod_cache.html.ja.utf8 new file mode 100644 index 0000000..c2d8488 --- /dev/null +++ b/docs/manual/mod/mod_cache.html.ja.utf8 @@ -0,0 +1,680 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="ja" xml:lang="ja"><head> +<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_cache - Apache HTTP サーバ バージョン 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> +<link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> +<script src="../style/scripts/prettify.min.js" type="text/javascript"> +</script> + +<link href="../images/favicon.ico" rel="shortcut icon" /></head> +<body> +<div id="page-header"> +<p class="menu"><a href="../mod/">モジュール</a> | <a href="../mod/directives.html">ディレクティブ</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">用語</a> | <a href="../sitemap.html">サイトマップ</a></p> +<p class="apache">Apache HTTP サーバ バージョン 2.4</p> +<img alt="" src="../images/feather.png" /></div> +<div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> +<div id="path"> +<a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP サーバ</a> > <a href="http://httpd.apache.org/docs/">ドキュメンテーション</a> > <a href="../">バージョン 2.4</a> > <a href="./">モジュール</a></div> +<div id="page-content"> +<div id="preamble"><h1>Apache モジュール mod_cache</h1> +<div class="toplang"> +<p><span>翻訳済み言語: </span><a href="../en/mod/mod_cache.html" hreflang="en" rel="alternate" title="English"> en </a> | +<a href="../fr/mod/mod_cache.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | +<a href="../ja/mod/mod_cache.html" title="Japanese"> ja </a> | +<a href="../ko/mod/mod_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> +</div> +<div class="outofdate">この日本語訳はすでに古くなっている + 可能性があります。 + 最近更新された内容を見るには英語版をご覧下さい。 + </div> +<table class="module"><tr><th><a href="module-dict.html#Description">説明:</a></th><td>URI をキーにしたコンテンツのキャッシュ</td></tr> +<tr><th><a href="module-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="module-dict.html#ModuleIdentifier">モジュール識別子:</a></th><td>cache_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">ソースファイル:</a></th><td>mod_cache.c</td></tr></table> +<h3>概要</h3> + + <div class="warning">このモジュールは <code class="directive"><a href="../mod/mod_authz_host.html#allow">Allow</a></code> や <code class="directive"><a href="../mod/mod_authz_host.html#deny">Deny</a></code> ディレクティブを無視しますので、 + 注意して使って下さい。クライアントのホスト名、アドレスや環境変数を使って + アクセスを制限したいコンテンツに対してはキャッシュ機能を有効にするべきではありません。 + </div> + + <p><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> はローカルのコンテンツやプロキシされた + コンテンツをキャッシュするために使われる <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a> 準拠の + HTTP コンテンツキャッシュを実装しています。<code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> + の動作にはストレージを管理するモジュールが必要です。標準 + Apache 配布には二つストレージ管理モジュールが含まれています:</p> + + <dl> + <dt><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code></dt> + <dd>ディスクを使用したストレージ管理機構を実装しています。</dd> + + <dt><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code></dt> + <dd>メモリを使用したストレージ管理機構を実装しています。 + <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> は次の二つのモードのどちらかで動作する + ように設定できます: オープンされているファイル記述子をキャッシュするモードか、 + ヒープ上でのオブジェクトの自体をキャッシュをするモードです。 + <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> はローカルで生成されるコンテンツや、 + <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> が + <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> を使って設定されている + ときの (つまり<dfn>リバースプロキシ</dfn> での) バックエンドサーバの + コンテンツをキャッシュするのに使えます。</dd> + </dl> + + <p>コンテンツのキャッシュへの保存と取得は URI に基づいたキーが使われます。 + アクセス保護のかけられているコンテンツはキャッシュされません。</p> + <p>より詳細な解説や例については<a href="../caching.html">キャッシュ機能</a> + を参照してください。</p> +</div> +<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>トピック</h3> +<ul id="topics"> +<li><img alt="" src="../images/down.gif" /> <a href="#related">関連モジュールとディレクティブ</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#sampleconf">サンプル設定</a></li> +</ul><h3 class="directives">ディレクティブ</h3> +<ul id="toc"> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedefaultexpire">CacheDefaultExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedetailheader">CacheDetailHeader</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedisable">CacheDisable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheenable">CacheEnable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheheader">CacheHeader</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreheaders">CacheIgnoreHeaders</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorenolastmod">CacheIgnoreNoLastMod</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorequerystring">CacheIgnoreQueryString</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreurlsessionidentifiers">CacheIgnoreURLSessionIdentifiers</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachekeybaseurl">CacheKeyBaseURL</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelastmodifiedfactor">CacheLastModifiedFactor</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelock">CacheLock</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelockmaxage">CacheLockMaxAge</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelockpath">CacheLockPath</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxexpire">CacheMaxExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheminexpire">CacheMinExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachequickhandler">CacheQuickHandler</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestaleonerror">CacheStaleOnError</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestoreexpired">CacheStoreExpired</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestorenostore">CacheStoreNoStore</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestoreprivate">CacheStorePrivate</a></li> +</ul> +<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_cache">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_cache">Report a bug</a></li></ul><h3>参照</h3> +<ul class="seealso"> +<li><a href="../caching.html">キャッシュ機能</a></li> +<li><a href="#comments_section">コメント</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="related" id="related">関連モジュールとディレクティブ</a></h2> + <table class="related"><tr><th>関連モジュール</th><th>関連ディレクティブ</th></tr><tr><td><ul><li><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</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_cache_disk.html#cacheroot">CacheRoot</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachedirlevels">CacheDirLevels</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachedirlength">CacheDirLength</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cacheminfilesize">CacheMinFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_dist.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">サンプル設定</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 cache_disk_module modules/mod_cache_disk.so<br /> + # If you want to use mod_cache_disk instead of mod_mem_cache,<br /> + # uncomment the line above and comment out the LoadModule line below.<br /> + <IfModule mod_cache_disk.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">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>期日が指定されていないときにドキュメントをキャッシュするデフォルトの期間</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheDefaultExpire <var>seconds</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheDefaultExpire 3600 (1時間)</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p><code class="directive">CacheDefaultExpire</code> ディレクティブは、ドキュメントに + 有効期限 (expiry) や最終修正時刻 (last-modified) が指定されていない場合の + デフォルトの時間を指定します。<code class="directive">CacheMaxExpire</code> + ディレクティブで指定された値はこの設定を上書き<em>しません</em>。</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="CacheDetailHeader" id="CacheDetailHeader">CacheDetailHeader</a> <a name="cachedetailheader" id="cachedetailheader">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Add an X-Cache-Detail header to the response.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheDetailHeader <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheDetailHeader off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト, ディレクトリ, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">互換性:</a></th><td>Available in Apache 2.3.9 and later</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheDisable" id="CacheDisable">CacheDisable</a> <a name="cachedisable" id="cachedisable">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>特定の URL をキャッシュしない</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheDisable <var> url-string</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p><code class="directive">CacheDisable</code> ディレクティブで + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> モジュールが <var>url-string</var> 以下の + URL をキャッシュ<em>しない</em>ようにします。</p> + + <div class="example"><h3>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">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>指定したストレージ管理方式を使ってのキャッシュを有効にする</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheEnable <var>cache_type</var> <var>url-string</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p><code class="directive">CacheEnable</code> ディレクティブで <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> + モジュールが <var>url-string</var> 以下の URL をキャッシュするようにします。 + キャッシュストレージ管理方式は <var>cache_type</var> 引数で指定します。 + <var>cache_type</var> <code> mem</code> で、 + <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> で実装されているメモリを使ったストレージ + 管理方式を使うように <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> に指示します。 + <var>cache_type</var> <code>disk</code> で、 + <code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code> で実装されているディスクを使ったストレージ + 管理を使うように <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> に指示します。 + <var>cache_type</var> <code>fd</code> は <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> に + <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> により実装されているファイル記述子の + キャッシュを使うように指示します。</p> + + <p>(下の例のように) <code class="directive">CacheEnable</code> ディレクティブの + URL 空間が重複しているときは、該当するストレージ方式を順に試して、 + 実際にリクエストの処理ができると、その方式で処理します。 + ストレージ管理方式が実行される順番は設定ファイル中の + <code class="directive">CacheEnable</code> の順番により決定されます。</p> + + <div class="example"><p><code> + CacheEnable mem /manual<br /> + CacheEnable fd /images<br /> + CacheEnable disk /<br /> + </code></p></div> + + <p>フォワードプロクシサーバとして動作する場合、 + <var>url-string</var> を使って、キャッシュを有効にするリモートサイトや + プロクシプロトコルを指定することもできます。</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="CacheHeader" id="CacheHeader">CacheHeader</a> <a name="cacheheader" id="cacheheader">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Add an X-Cache header to the response.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheHeader <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheHeader off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト, ディレクトリ, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">互換性:</a></th><td>Available in Apache 2.3.9 and later</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheIgnoreCacheControl" id="CacheIgnoreCacheControl">CacheIgnoreCacheControl</a> <a name="cacheignorecachecontrol" id="cacheignorecachecontrol">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>キャッシュされているコンテンツを返さないようにクライアントから +リクエストされても無視する</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheIgnoreCacheControl On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheIgnoreCacheControl Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p>Cache-Control: no-cache ヘッダや Pragma: no-store ヘッダのあるリクエストに + 対しては、通常キャッシュを使いません。<code class="directive">CacheIgnoreCacheControl</code> + ディレクティブを使うと、この動作を上書きできます。 + <code class="directive">CacheIgnoreCacheControl</code> On とすると、 + リクエストに no-cache という値があっても、キャッシュを使ってドキュメントを + 返すようになります。認証を必要とするドキュメントは<em>決して</em> + キャッシュされません。</p> + + <div class="example"><p><code> + CacheIgnoreCacheControl On + </code></p></div> + + <div class="warning"><h3>警告</h3> + このディレクティブを使うと、ドキュメント取得時にキャッシュを使わないように + クライアントがリクエストしているにもかかわらず、キャッシュを + 使うようになります。その結果、 + 古いコンテンツが送られ続けることになってしまうかもしれません。 + </div> + +<h3>参照</h3> +<ul> +<li><code class="directive"><a href="#cachestoreprivate">CacheStorePrivate</a></code></li> +<li><code class="directive"><a href="#cachestorenostore">CacheStoreNoStore</a></code></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheIgnoreHeaders" id="CacheIgnoreHeaders">CacheIgnoreHeaders</a> <a name="cacheignoreheaders" id="cacheignoreheaders">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>指定された HTTP ヘッダをキャッシュに保存しない。 +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheIgnoreHeaders <var>header-string</var> [<var>header-string</var>] ...</code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheIgnoreHeaders None</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p>RFC 2616 によると、hop-by-hop HTTP ヘッダはキャッシュには保管されません。 + 以下のヘッダは hop-by-hop ヘッダに該当しますので、 + <code class="directive">CacheIgnoreHeaders</code> + の設定に<em>関係なく</em>キャッシュには保管されません:</p> + <ul> + <li><code>Connection</code></li> + <li><code>Keep-Alive</code></li> + <li><code>Proxy-Authenticate</code></li> + <li><code>Proxy-Authorization</code></li> + <li><code>TE</code></li> + <li><code>Trailers</code></li> + <li><code>Transfer-Encoding</code></li> + <li><code>Upgrade</code></li> + </ul> + + <p><code class="directive">CacheIgnoreHeaders</code> で + キャッシュに保管しない追加の HTTP ヘッダを指定します。 + 例えば、クッキーをキャッシュに保管しないようにした方がよい場合も + あるでしょう。</p> + + <p><code class="directive">CacheIgnoreHeaders</code> の引数は、 + キャッシュに保管しない HTTP ヘッダを空白区切りにしたリスト形式です。 + キャッシュに保管しないヘッダが hop-by-hop ヘッダだけの場合 + (RFC 2616 準拠の動作のとき) は、 + <code class="directive">CacheIgnoreHeaders</code> を <code>None</code> + に設定できます。</p> + + <div class="example"><h3>例 1</h3><p><code> + CacheIgnoreHeaders Set-Cookie + </code></p></div> + + <div class="example"><h3>例 2</h3><p><code> + CacheIgnoreHeaders None + </code></p></div> + + <div class="warning"><h3>警告:</h3> + <code>Expires</code> のような適切のキャッシュ管理のために必要な + ヘッダが <code class="directive">CacheIgnoreHeaders</code> の設定により + 保管されていないときは、mod_cache の動作は定義されていません。 + </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="CacheIgnoreNoLastMod" id="CacheIgnoreNoLastMod">CacheIgnoreNoLastMod</a> <a name="cacheignorenolastmod" id="cacheignorenolastmod">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>応答に Last Modified が無くても気にしないようにする</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheIgnoreNoLastMod On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheIgnoreNoLastMod Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p>通常、Last-Modified による最終修正時刻の無いドキュメントはキャッシュ + されません。(例えば <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> による処理のときなどに) + Last-Modified 時刻が消去されたり、そもそも最初から提供されていない + 状況があります。<code class="directive">CacheIgnoreNoLastMod</code> + ディレクティブを使うと、Last-Modified 日時が指定されていない + ドキュメントでもキャッシュするように指定できます。ドキュメントに + 最終修正時刻 (Last-Modified) 有効期限 (expiry) がない場合は、有効期限の + 生成に <code class="directive">CacheDefaultExpire</code> が使われます。</p> + + <div class="example"><p><code> + CacheIgnoreNoLastMod On + </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="CacheIgnoreQueryString" id="CacheIgnoreQueryString">CacheIgnoreQueryString</a> <a name="cacheignorequerystring" id="cacheignorequerystring">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>キャッシュ時にクエリーストリングを無視する</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheIgnoreQueryString On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheIgnoreQueryString Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p>クエリーストリング付のリクエストについては通常、クエリーストリングごとに + 個別にキャッシュされます。 + キャッシュされるのは有効期限が指定されている場合のみで、これは + RFC 2616/13.9 に従ったものです。 + <code class="directive">CacheIgnoreQueryString</code> ディレクティブを使うと + 有効期限が指定されていなくてもキャッシュしますし、 + クエリーストリングが異なっていてもキャッシュを返します。 + このディレクティブが有効になっている場合、キャッシュ機能の側面からみると、 + あたかもリクエストにクエリーストリングがついていなかったかのように扱います。</p> + + <div class="example"><p><code> + CacheIgnoreQueryString On + </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="CacheIgnoreURLSessionIdentifiers" id="CacheIgnoreURLSessionIdentifiers">CacheIgnoreURLSessionIdentifiers</a> <a name="cacheignoreurlsessionidentifiers" id="cacheignoreurlsessionidentifiers">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Ignore defined session identifiers encoded in the URL when caching +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheIgnoreURLSessionIdentifiers <var>identifier</var> [<var>identifier</var>] ...</code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheIgnoreURLSessionIdentifiers None</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheKeyBaseURL" id="CacheKeyBaseURL">CacheKeyBaseURL</a> <a name="cachekeybaseurl" id="cachekeybaseurl">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Override the base URL of reverse proxied cache keys.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheKeyBaseURL <var>URL</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">互換性:</a></th><td>Available in Apache 2.3.9 and later</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheLastModifiedFactor" id="CacheLastModifiedFactor">CacheLastModifiedFactor</a> <a name="cachelastmodifiedfactor" id="cachelastmodifiedfactor">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>LastModified の日付に基づいて有効期限 (expiry) +を計算するための重みを指定する +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheLastModifiedFactor <var>float</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheLastModifiedFactor 0.1</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p>ドキュメントに Last-Modified の日付が無いけれども有効期限 (expiry) + の日付があるというときに、有効期限を最終修正時刻からの経過時間として + 計算するようにできます。有効期限を次の計算式に従って生成するのですが、 + そのときに使われる <var>factor</var> を + <code class="directive">CacheLastModifiedFactor</code> ディレクティブで指定します。 + </p> + + <p><code>expiry-period = time-since-last-modified-date * <var>factor</var> + expiry-date = current-date + expiry-period</code></p> + + <p>例えば、ドキュメントが 10 時間前に最後に修正されていて、 + <var>factor</var> が 0.1 であれば、期日は 10*0.1 = 1 時間に + 設定されます。現在時刻が 3:00pm であれば、計算された期日は + 3:00pm + 1hour = 4:00pm になります。</p> + + <p>期日が <code class="directive">CacheMaxExpire</code> で設定されている値 + より大きくなってしまっている場合は、<code class="directive">CacheMaxExpire</code> + の設定値が優先されます。</p> + + <div class="example"><p><code> + CacheLastModifiedFactor 0.5 + </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="CacheLock" id="CacheLock">CacheLock</a> <a name="cachelock" id="cachelock">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Enable the thundering herd lock.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheLock <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheLock off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">互換性:</a></th><td>Available in Apache 2.2.15 and later</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheLockMaxAge" id="CacheLockMaxAge">CacheLockMaxAge</a> <a name="cachelockmaxage" id="cachelockmaxage">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Set the maximum possible age of a cache lock.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheLockMaxAge <var>integer</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheLockMaxAge 5</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheLockPath" id="CacheLockPath">CacheLockPath</a> <a name="cachelockpath" id="cachelockpath">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Set the lock path directory.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheLockPath <var>directory</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheLockPath /tmp/mod_cache-lock</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheMaxExpire" id="CacheMaxExpire">CacheMaxExpire</a> <a name="cachemaxexpire" id="cachemaxexpire">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>ドキュメントをキャッシュする最大時間を秒数で表したもの</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheMaxExpire <var>seconds</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheMaxExpire 86400 (一日)</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p><code class="directive">CacheMaxExpire</code> ディレクティブは、 + キャッシュする HTTP ドキュメントを、元のサーバに問い合わせないまま最大何秒 + 保持してもよいかを指定します。つまり、ドキュメントは最大でこの秒数間ぶん古く + なることになります。この最大値は、<span class="transnote">(<em>訳注:</em> レスポンス中で)</span>ドキュメントと共に + ドキュメントの期日が提供されている場合でも適用されます。</p> + + <div class="example"><p><code> + CacheMaxExpire 604800 + </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="CacheMinExpire" id="CacheMinExpire">CacheMinExpire</a> <a name="cacheminexpire" id="cacheminexpire">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>ドキュメントをキャッシュする最小秒数</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheMinExpire <var>seconds</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheMinExpire 0</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p>キャッシュ可能な HTTP ドキュメントがあったときに、オリジンサーバに問い合わせることなく + 保持する秒数の最小値は <code class="directive">CacheMinExpire</code> ディレクティブを使って設定します。 + この値は、ドキュメントに妥当な有効期限が指定されていなかった場合にのみ使われます。</p> + + + <div class="example"><p><code> + CacheMinExpire 3600 + </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="CacheQuickHandler" id="CacheQuickHandler">CacheQuickHandler</a> <a name="cachequickhandler" id="cachequickhandler">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Run the cache from the quick handler.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheQuickHandler <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheQuickHandler on</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">互換性:</a></th><td>Apache HTTP Server 2.3.3 and later</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheStaleOnError" id="CacheStaleOnError">CacheStaleOnError</a> <a name="cachestaleonerror" id="cachestaleonerror">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Serve stale content in place of 5xx responses.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheStaleOnError <var>on|off</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheStaleOnError on</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト, ディレクトリ, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +<tr><th><a href="directive-dict.html#Compatibility">互換性:</a></th><td>Available in Apache 2.3.9 and later</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheStoreExpired" id="CacheStoreExpired">CacheStoreExpired</a> <a name="cachestoreexpired" id="cachestoreexpired">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>Attempt to cache responses that the server reports as expired</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheStoreExpired On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheStoreExpired Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト, ディレクトリ, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table><p>このディレクティブの解説文書は + まだ翻訳されていません。英語版をご覧ください。 + </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="CacheStoreNoStore" id="CacheStoreNoStore">CacheStoreNoStore</a> <a name="cachestorenostore" id="cachestorenostore">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>no-store と指定されているレスポンスのキャッシュを試みる。</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheStoreNoStore On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheStoreNoStore Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p>通常 Cache-Control: no-store ヘッダのついているレスポンスは + キャッシュされません。<code class="directive">CacheStoreNoCache</code> + ディレクティブでこの挙動を上書きできます。 + <code class="directive">CacheStoreNoCache</code> On で no-store ヘッダのついている + リソースに対してもキャッシュを試みるようになります。 + ただし認証の求められるリソースは <em>決して</em> キャッシュされません。</p> + + <div class="example"><p><code> + CacheStoreNoStore On + </code></p></div> + + <div class="warning"><h3>警告:</h3> + RFC 2616 に記載されているように no-store ディレクティブは、 + "不注意による機密情報の漏洩や残留 (バックアップテープ等) を防ぐ" + 目的で使われますが、このオプションを有効にすると、 + 機密情報を保持することになってしまいます。 + ですので、ここで警告しておきます。 + </div> + +<h3>参照</h3> +<ul> +<li><code class="directive"><a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></code></li> +<li><code class="directive"><a href="#cachestoreprivate">CacheStorePrivate</a></code></li> +</ul> +</div> +<div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> +<div class="directive-section"><h2><a name="CacheStorePrivate" id="CacheStorePrivate">CacheStorePrivate</a> <a name="cachestoreprivate" id="cachestoreprivate">ディレクティブ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">説明:</a></th><td>private と指定されているレスポンスのキャッシュを試みる。</td></tr> +<tr><th><a href="directive-dict.html#Syntax">構文:</a></th><td><code>CacheStorePrivate On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">デフォルト:</a></th><td><code>CacheStorePrivate Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">コンテキスト:</a></th><td>サーバ設定ファイル, バーチャルホスト</td></tr> +<tr><th><a href="directive-dict.html#Status">ステータス:</a></th><td>Extension</td></tr> +<tr><th><a href="directive-dict.html#Module">モジュール:</a></th><td>mod_cache</td></tr> +</table> + <p>通常 Cache-Control: private ヘッダのついているレスポンスは + キャッシュされません。<code class="directive">CacheStorePrivate</code> + ディレクティブでこの挙動を上書きできます。 + <code class="directive">CacheStorePrivate</code> On で private ヘッダのついている + リソースに対してもキャッシュを試みるようになります。 + ただし認証の求められるリソースは <em>決して</em> キャッシュされません。</p> + + <div class="example"><p><code> + CacheStorePrivate On + </code></p></div> + + <div class="warning"><h3>警告:</h3> + 上流サーバがキャッシュしないように指定してきても、 + それを無視してキャッシュするようになります。 + 望ましい挙動になるのは、本当に 'private' なキャッシュについてのみでしょう。 + </div> + +<h3>参照</h3> +<ul> +<li><code class="directive"><a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></code></li> +<li><code class="directive"><a href="#cachestorenostore">CacheStoreNoStore</a></code></li> +</ul> +</div> +</div> +<div class="bottomlang"> +<p><span>翻訳済み言語: </span><a href="../en/mod/mod_cache.html" hreflang="en" rel="alternate" title="English"> en </a> | +<a href="../fr/mod/mod_cache.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | +<a href="../ja/mod/mod_cache.html" title="Japanese"> ja </a> | +<a href="../ko/mod/mod_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p> +</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">コメント</a></h2><div 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\ No newline at end of file diff --git a/docs/manual/mod/mod_cache.html.ko.euc-kr b/docs/manual/mod/mod_cache.html.ko.euc-kr new file mode 100644 index 0000000..d945082 --- /dev/null +++ b/docs/manual/mod/mod_cache.html.ko.euc-kr @@ -0,0 +1,532 @@ +<?xml version="1.0" encoding="EUC-KR"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="ko" xml:lang="ko"><head> +<meta content="text/html; charset=EUC-KR" http-equiv="Content-Type" /> +<!-- + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + This file is generated from xml source: DO NOT EDIT + XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX + --> +<title>mod_cache - Apache HTTP Server Version 2.4</title> +<link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> +<link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" 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<a href="../">Version 2.4</a> > <a href="./"></a></div> +<div id="page-content"> +<div id="preamble"><h1>ġ mod_cache</h1> +<div class="toplang"> +<p><span> : </span><a href="../en/mod/mod_cache.html" hreflang="en" rel="alternate" title="English"> en </a> | +<a href="../fr/mod/mod_cache.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | +<a href="../ja/mod/mod_cache.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../ko/mod/mod_cache.html" title="Korean"> ko </a></p> +</div> +<div class="outofdate"> ֽ ƴմϴ. + ֱٿ ϼ.</div> +<table class="module"><tr><th><a href="module-dict.html#Description">:</a></th><td>URI Ű Ͽ ijѴ.</td></tr> +<tr><th><a href="module-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="module-dict.html#ModuleIdentifier">:</a></th><td>cache_module</td></tr> +<tr><th><a href="module-dict.html#SourceFile">ҽ:</a></th><td>mod_cache.c</td></tr></table> +<h3></h3> + + <div class="warning"> + ̴. ۾̴... + </div> + + <p><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> ǻͿ ִ ̳ + Ͻõ ij ִ <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a> + ȣȯ HTTP ij Ѵ. <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> + Ϸ (storage management module) ʿϴ. + ⺻ ġ ΰ ִ:</p> + <dl> + <dt><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code></dt> + <dd> ũ ڸ Ѵ.</dd> + + <dt><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code></dt> + <dd> ڸ Ѵ. + <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> ϱڸ ijϰų + (heap) ü ijϴ ΰ Ѱ + ϵ ִ. <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> + ڽ ijϰų, (<dfn>Ͻ(reverse proxy)</dfn> + ˷) <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> + Ͽ <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> + ij ִ.</dd> + </dl> + + <p> URI Ű ij ϰ ´. + ٺȣ ijʴ´.</p> +</div> +<div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3></h3> +<ul id="topics"> +<li><img alt="" src="../images/down.gif" /> <a href="#related">õ þ</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#sampleconf"></a></li> +</ul><h3 class="directives">þ</h3> +<ul id="toc"> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedefaultexpire">CacheDefaultExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedetailheader">CacheDetailHeader</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachedisable">CacheDisable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheenable">CacheEnable</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheheader">CacheHeader</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreheaders">CacheIgnoreHeaders</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorenolastmod">CacheIgnoreNoLastMod</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignorequerystring">CacheIgnoreQueryString</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreurlsessionidentifiers">CacheIgnoreURLSessionIdentifiers</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachekeybaseurl">CacheKeyBaseURL</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelastmodifiedfactor">CacheLastModifiedFactor</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelock">CacheLock</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelockmaxage">CacheLockMaxAge</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachelockpath">CacheLockPath</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachemaxexpire">CacheMaxExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cacheminexpire">CacheMinExpire</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachequickhandler">CacheQuickHandler</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestaleonerror">CacheStaleOnError</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestoreexpired">CacheStoreExpired</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestorenostore">CacheStoreNoStore</a></li> +<li><img alt="" src="../images/down.gif" /> <a href="#cachestoreprivate">CacheStorePrivate</a></li> +</ul> +<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_cache">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_cache">Report a bug</a></li></ul><h3></h3> +<ul class="seealso"> +<li><a href="#comments_section">Comments</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="related" id="related">õ þ</a></h2> + <table class="related"><tr><th>õ </th><th>õ þ</th></tr><tr><td><ul><li><code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</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_cache_disk.html#cacheroot">CacheRoot</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachesize">CacheSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachegcinterval">CacheGcInterval</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachedirlevels">CacheDirLevels</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachedirlength">CacheDirLength</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cacheexpirycheck">CacheExpiryCheck</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cacheminfilesize">CacheMinFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachemaxfilesize">CacheMaxFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachetimemargin">CacheTimeMargin</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachegcdaily">CacheGcDaily</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachegcunused">CacheGcUnused</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachegcclean">CacheGcClean</a></code></li><li><code class="directive"><a href="../mod/mod_cache_disk.html#cachegcmemusage">CacheGcMemUsage</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"></a></h2> + <div class="example"><h3>Sample httpd.conf</h3><p><code> + #<br /> + # ij <br /> + #<br /> + LoadModule cache_module modules/mod_cache.so<br /> + <br /> + <IfModule mod_cache.c><br /> + <span class="indent"> + #LoadModule cache_disk_module modules/mod_cache_disk.so<br /> + <IfModule mod_cache_disk.c><br /> + <span class="indent"> + CacheRoot c:/cacheroot<br /> + CacheSize 256<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 /> + </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">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>ð ij ⺻ Ⱓ.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code>CacheDefaultExpire <var>seconds</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">⺻:</a></th><td><code>CacheDefaultExpire 3600 (one hour)</code></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table> + <p><code class="directive">CacheDefaultExpire</code> þ + ð ֱټð ij ʴ + ⺻ ð Ѵ. <code class="directive">CacheMaxExpire</code> + <em>ʴ´</em>.</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="CacheDetailHeader" id="CacheDetailHeader">CacheDetailHeader</a> <a name="cachedetailheader" id="cachedetailheader">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Add an X-Cache-Detail header to the response.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ, directory, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheDisable" id="CacheDisable">CacheDisable</a> <a name="cachedisable" id="cachedisable">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Ư URL ij ʴ´</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code>CacheDisable <var> url-string</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table> + <p><code class="directive">CacheDisable</code> þ ϸ + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> <var>url-string</var> + url ij <em>ʴ´</em>.</p> + + <div class="example"><h3></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">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td> ڸ Ͽ URL ijѴ</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code>CacheEnable <var>cache_type</var> <var>url-string</var></code></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table> + <p><code class="directive">CacheEnable</code> þ ϸ + <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> <var>url-string</var> + url ijѴ. ij ڴ <var>cache_type</var> + ƱԸƮ Ѵ. <var>cache_type</var> <code>mem</code> + <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> ϴ + ڸ Ѵ. <var>cache_type</var> <code>disk</code> + <code class="module"><a href="../mod/mod_cache_disk.html">mod_cache_disk</a></code> ϴ ũ + ڸ Ѵ. <var>cache_type</var> <code>fd</code> + <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> ϴ ϱ ij + Ѵ.</p> + <p>(Ʒ ) URL ٸ + <code class="directive">CacheEnable</code> þ ġ + ڰ û óҶ ڸ + Ѵ. Ͽ <code class="directive">CacheEnable</code> + þ ڰ ȴ.</p> + + <div class="example"><p><code> + CacheEnable mem /manual<br /> + CacheEnable fd /images<br /> + CacheEnable disk /<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="CacheHeader" id="CacheHeader">CacheHeader</a> <a name="cacheheader" id="cacheheader">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Add an X-Cache header to the response.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ, directory, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheIgnoreCacheControl" id="CacheIgnoreCacheControl">CacheIgnoreCacheControl</a> <a name="cacheignorecachecontrol" id="cacheignorecachecontrol">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Ŭ̾Ʈ ijʴ û Ѵ.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code>CacheIgnoreCacheControl On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">⺻:</a></th><td><code>CacheIgnoreCacheControl Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table> + <p> no-cache no-store ij + ʴ´. <code class="directive">CacheIgnoreCacheControl</code> + þ ̷ ൿ Ѵ. + <code class="directive">CacheIgnoreCacheControl</code> On ϸ + no-cache no-store ־ + ijѴ. ʿ <em></em> ij + ʴ´.</p> + + <div class="example"><p><code> + CacheIgnoreCacheControl On + </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="CacheIgnoreHeaders" id="CacheIgnoreHeaders">CacheIgnoreHeaders</a> <a name="cacheignoreheaders" id="cacheignoreheaders">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>ij HTTP () ʴ´ +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code>CacheIgnoreHeaders <var>header-string</var> [<var>header-string</var>] ...</code></td></tr> +<tr><th><a href="directive-dict.html#Default">⺻:</a></th><td><code>CacheIgnoreHeaders None</code></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table> + <p>RFC 2616 ȩ(hop-by-hop) HTTP ij + ʴ´. ȩ HTTP , + <code class="directive">CacheIgnoreHeaders</code> + <em></em> 쿡 ij ʴ´.</p> + + <ul> + <li><code>Connection</code></li> + <li><code>Keep-Alive</code></li> + <li><code>Proxy-Authenticate</code></li> + <li><code>Proxy-Authorization</code></li> + <li><code>TE</code></li> + <li><code>Trailers</code></li> + <li><code>Transfer-Encoding</code></li> + <li><code>Upgrade</code></li> + </ul> + + <p><code class="directive">CacheIgnoreHeaders</code> ij ϸ + ȵǴ HTTP ߰ Ѵ. , Ű(cookie) + ij ϸ ȵǴ 찡 ִ.</p> + + <p><code class="directive">CacheIgnoreHeaders</code> ij + HTTP ´. (RFC 2616 + ) ij ȩ , + <code class="directive">CacheIgnoreHeaders</code> + <code>None</code> Ѵ.</p> + + <div class="example"><h3> 1</h3><p><code> + CacheIgnoreHeaders Set-Cookie + </code></p></div> + + <div class="example"><h3> 2</h3><p><code> + CacheIgnoreHeaders None + </code></p></div> + + <div class="warning"><h3>:</h3> + <code class="directive">CacheIgnoreHeaders</code> Ͽ + <code>Expires</code> ij ʿ + , mod_cache Ѵ. + </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="CacheIgnoreNoLastMod" id="CacheIgnoreNoLastMod">CacheIgnoreNoLastMod</a> <a name="cacheignorenolastmod" id="cacheignorenolastmod">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>信 Last Modified ٴ Ѵ.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code>CacheIgnoreNoLastMod On|Off</code></td></tr> +<tr><th><a href="directive-dict.html#Default">⺻:</a></th><td><code>CacheIgnoreNoLastMod Off</code></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table> + <p> ֱټ ij ʴ´. + ֱټ ( <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> ó߿) + ų ó ִ. + <code class="directive">CacheIgnoreNoLastMod</code> þ ֱټ + ݵ ijϵ . ֱټϰ + ð <code class="directive">CacheDefaultExpire</code> + þ ð Ѵ.</p> + + <div class="example"><p><code> + CacheIgnoreNoLastMod On + </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="CacheIgnoreQueryString" id="CacheIgnoreQueryString">CacheIgnoreQueryString</a> <a name="cacheignorequerystring" id="cacheignorequerystring">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Ignore query string when caching</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheIgnoreURLSessionIdentifiers" id="CacheIgnoreURLSessionIdentifiers">CacheIgnoreURLSessionIdentifiers</a> <a name="cacheignoreurlsessionidentifiers" id="cacheignoreurlsessionidentifiers">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Ignore defined session identifiers encoded in the URL when caching +</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheKeyBaseURL" id="CacheKeyBaseURL">CacheKeyBaseURL</a> <a name="cachekeybaseurl" id="cachekeybaseurl">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Override the base URL of reverse proxied cache keys.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheLastModifiedFactor" id="CacheLastModifiedFactor">CacheLastModifiedFactor</a> <a name="cachelastmodifiedfactor" id="cachelastmodifiedfactor">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>LastModified ð ð ϴµ ϴ +.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code>CacheLastModifiedFactor <var>float</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">⺻:</a></th><td><code>CacheLastModifiedFactor 0.1</code></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table> + <p> ð ֱټ ִ ֱټ + ð ð Ѵ. + <code class="directive">CacheLastModifiedFactor</code> þ + ð ϴ Ŀ <var>factor</var> + Ѵ: + + <code>expiry-period = time-since-last-modified-date * <var>factor</var> + expiry-date = current-date + expiry-period</code> + + , 10 ð Ǿ <var>factor</var> + 0.1̶ Ⱓ 10*01 = 1 ð ȴ. ð + 3:00pm̶ ð 3:00pm + 1ð = 4:00pm̴. + + Ⱓ <code class="directive">CacheMaxExpire</code> ٸ + <code class="directive">CacheMaxExpire</code> Ѵ.</p> + + <div class="example"><p><code> + CacheLastModifiedFactor 0.5 + </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="CacheLock" id="CacheLock">CacheLock</a> <a name="cachelock" id="cachelock">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Enable the thundering herd lock.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheLockMaxAge" id="CacheLockMaxAge">CacheLockMaxAge</a> <a name="cachelockmaxage" id="cachelockmaxage">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Set the maximum possible age of a cache lock.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheLockPath" id="CacheLockPath">CacheLockPath</a> <a name="cachelockpath" id="cachelockpath">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Set the lock path directory.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheMaxExpire" id="CacheMaxExpire">CacheMaxExpire</a> <a name="cachemaxexpire" id="cachemaxexpire">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td> ijϴ ʴ ִð</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code>CacheMaxExpire <var>seconds</var></code></td></tr> +<tr><th><a href="directive-dict.html#Default">⺻:</a></th><td><code>CacheMaxExpire 86400 (Ϸ)</code></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table> + <p><code class="directive">CacheMaxExpire</code> þ + ˻ʰ ij HTTP ִ ʴ + ִð Ѵ. , ִ ŭ Ǿ. + ð Ͽ ִ밪 Ų.</p> + + <div class="example"><p><code> + CacheMaxExpire 604800 + </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="CacheMinExpire" id="CacheMinExpire">CacheMinExpire</a> <a name="cacheminexpire" id="cacheminexpire">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>The minimum time in seconds to cache a document</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ, directory, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheQuickHandler" id="CacheQuickHandler">CacheQuickHandler</a> <a name="cachequickhandler" id="cachequickhandler">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Run the cache from the quick handler.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheStaleOnError" id="CacheStaleOnError">CacheStaleOnError</a> <a name="cachestaleonerror" id="cachestaleonerror">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Serve stale content in place of 5xx responses.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ, directory, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheStoreExpired" id="CacheStoreExpired">CacheStoreExpired</a> <a name="cachestoreexpired" id="cachestoreexpired">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Attempt to cache responses that the server reports as expired</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ, directory, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheStoreNoStore" id="CacheStoreNoStore">CacheStoreNoStore</a> <a name="cachestorenostore" id="cachestorenostore">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Attempt to cache requests or responses that have been marked as no-store.</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ, directory, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of 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="CacheStorePrivate" id="CacheStorePrivate">CacheStorePrivate</a> <a name="cachestoreprivate" id="cachestoreprivate">þ</a></h2> +<table class="directive"> +<tr><th><a href="directive-dict.html#Description">:</a></th><td>Attempt to cache responses that the server has marked as private</td></tr> +<tr><th><a href="directive-dict.html#Syntax">:</a></th><td><code /></td></tr> +<tr><th><a href="directive-dict.html#Context">:</a></th><td>ּ, ȣƮ, directory, .htaccess</td></tr> +<tr><th><a href="directive-dict.html#Status">:</a></th><td>Experimental</td></tr> +<tr><th><a href="directive-dict.html#Module">:</a></th><td>mod_cache</td></tr> +</table><p>Documentation not yet translated. Please see English version of document.</p> +</div> +</div> +<div class="bottomlang"> +<p><span> : </span><a href="../en/mod/mod_cache.html" hreflang="en" rel="alternate" title="English"> en </a> | +<a href="../fr/mod/mod_cache.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | +<a href="../ja/mod/mod_cache.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a> | +<a href="../ko/mod/mod_cache.html" title="Korean"> ko </a></p> +</div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. Questions on how to manage the Apache HTTP Server should be directed at either our IRC channel, #httpd, on Libera.chat, or sent to our <a href="https://httpd.apache.org/lists.html">mailing lists</a>.</div> +<script type="text/javascript"><!--//--><![CDATA[//><!-- +var comments_shortname = 'httpd'; +var comments_identifier = 'http://httpd.apache.org/docs/2.4/mod/mod_cache.html'; +(function(w, d) { + if (w.location.hostname.toLowerCase() == "httpd.apache.org") { + d.write('<div id="comments_thread"><\/div>'); + var s = d.createElement('script'); + s.type = 'text/javascript'; + s.async = true; + s.src = 'https://comments.apache.org/show_comments.lua?site=' + comments_shortname + '&page=' + comments_identifier; + (d.getElementsByTagName('head')[0] || d.getElementsByTagName('body')[0]).appendChild(s); + } + else { + d.write('<div id="comments_thread">Comments are disabled for this page at the moment.<\/div>'); + } +})(window, document); +//--><!]]></script></div><div id="footer"> +<p class="apache">Copyright 2023 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/"></a> | <a href="../mod/directives.html">þ</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html"></a> | <a href="../sitemap.html">Ʈ</a></p></div><script type="text/javascript"><!--//--><![CDATA[//><!-- +if (typeof(prettyPrint) !== 'undefined') { + prettyPrint(); +} +//--><!]]></script> +</body></html>
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