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8 <title>mod_cache - Apache HTTP Server</title>
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16 <p class="apache">Apache HTTP Server Version 2.0</p>
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20 <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 2.0</a> > <a href="./">Modules</a></div>
21 <div id="page-content">
22 <div id="preamble"><h1>Apache Module mod_cache</h1>
24 <p><span>Available Languages: </span><a href="../en/mod/mod_cache.html" title="English"> en </a> |
25 <a href="../ko/mod/mod_cache.html" hreflang="ko" rel="alternate" title="Korean"> ko </a></p>
27 <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Content cache keyed to URIs.</td></tr>
28 <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
29 <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>cache_module</td></tr>
30 <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_cache.c</td></tr></table>
34 This module is experimental. Documentation is still under development...
37 <p><code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> implements an <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC 2616</a> compliant HTTP
38 content cache that can be used to cache either local or proxied content.
39 <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> requires the services of one or more storage
40 management modules. Two storage management modules are included in
41 the base Apache distribution:</p>
43 <dt><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code></dt>
44 <dd>implements a disk based storage manager.</dd>
46 <dt><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code></dt>
47 <dd>implements a memory based storage manager.
48 <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> can be configured to operate in two
49 modes: caching open file descriptors or caching objects in heap storage.
50 <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code> can be used to cache locally generated content
51 or to cache backend server content for <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> when
52 configured using <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code>
53 (aka <dfn>reverse proxy</dfn>)</dd>
56 <p>Content is stored in and retrieved from the cache using URI based keys. Content with
57 access protection is not cached.</p>
59 <div id="quickview"><h3 class="directives">Directives</h3>
61 <li><img alt="" src="../images/down.gif" /> <a href="#cachedefaultexpire">CacheDefaultExpire</a></li>
62 <li><img alt="" src="../images/down.gif" /> <a href="#cachedisable">CacheDisable</a></li>
63 <li><img alt="" src="../images/down.gif" /> <a href="#cacheenable">CacheEnable</a></li>
64 <li><img alt="" src="../images/down.gif" /> <a href="#cacheforcecompletion">CacheForceCompletion</a></li>
65 <li><img alt="" src="../images/down.gif" /> <a href="#cacheignorecachecontrol">CacheIgnoreCacheControl</a></li>
66 <li><img alt="" src="../images/down.gif" /> <a href="#cacheignoreheaders">CacheIgnoreHeaders</a></li>
67 <li><img alt="" src="../images/down.gif" /> <a href="#cacheignorenolastmod">CacheIgnoreNoLastMod</a></li>
68 <li><img alt="" src="../images/down.gif" /> <a href="#cachelastmodifiedfactor">CacheLastModifiedFactor</a></li>
69 <li><img alt="" src="../images/down.gif" /> <a href="#cachemaxexpire">CacheMaxExpire</a></li>
73 <li><img alt="" src="../images/down.gif" /> <a href="#related">Related Modules and Directives</a></li>
74 <li><img alt="" src="../images/down.gif" /> <a href="#sampleconf">Sample Configuration</a></li>
76 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
78 <h2><a name="related" id="related">Related Modules and Directives</a></h2>
79 <table class="related"><tr><th>Related Modules</th><th>Related Directives</th></tr><tr><td><ul><li><code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code></li><li><code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code></li></ul></td><td><ul><li><code class="directive"><a href="../mod/mod_disk_cache.html#cacheroot">CacheRoot</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachesize">CacheSize</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcinterval">CacheGcInterval</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachedirlevels">CacheDirLevels</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachedirlength">CacheDirLength</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cacheexpirycheck">CacheExpiryCheck</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cacheminfilesize">CacheMinFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachemaxfilesize">CacheMaxFileSize</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachetimemargin">CacheTimeMargin</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcdaily">CacheGcDaily</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcunused">CacheGcUnused</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.html#cachegcclean">CacheGcClean</a></code></li><li><code class="directive"><a href="../mod/mod_disk_cache.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>
80 </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
82 <h2><a name="sampleconf" id="sampleconf">Sample Configuration</a></h2>
83 <div class="example"><h3>Sample httpd.conf</h3><p><code>
85 # Sample Cache Configuration<br />
87 LoadModule cache_module modules/mod_cache.so<br />
89 <IfModule mod_cache.c><br />
91 #LoadModule disk_cache_module modules/mod_disk_cache.so<br />
92 <IfModule mod_disk_cache.c><br />
94 CacheRoot c:/cacheroot<br />
96 CacheEnable disk /<br />
97 CacheDirLevels 5<br />
98 CacheDirLength 3<br />
100 </IfModule> <br />
102 LoadModule mem_cache_module modules/mod_mem_cache.so<br />
103 <IfModule mod_mem_cache.c><br />
104 <span class="indent">
105 CacheEnable mem /<br />
106 MCacheSize 4096<br />
107 MCacheMaxObjectCount 100<br />
108 MCacheMinObjectSize 1<br />
109 MCacheMaxObjectSize 2048<br />
111 </IfModule><br />
116 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
117 <div class="directive-section"><h2><a name="CacheDefaultExpire" id="CacheDefaultExpire">CacheDefaultExpire</a> <a name="cachedefaultexpire" id="cachedefaultexpire">Directive</a></h2>
118 <table class="directive">
119 <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>
120 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDefaultExpire <var>seconds</var></code></td></tr>
121 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheDefaultExpire 3600 (one hour)</code></td></tr>
122 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
123 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
124 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
126 <p>The <code class="directive">CacheDefaultExpire</code> directive specifies a default time,
127 in seconds, to cache a document if neither an expiry date nor last-modified date are provided
128 with the document. The value specified with the <code class="directive">CacheMaxExpire</code>
129 directive does <em>not</em> override this setting.</p>
131 <div class="example"><p><code>
132 CacheDefaultExpire 86400
136 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
137 <div class="directive-section"><h2><a name="CacheDisable" id="CacheDisable">CacheDisable</a> <a name="cachedisable" id="cachedisable">Directive</a></h2>
138 <table class="directive">
139 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Disable caching of specified URLs</td></tr>
140 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheDisable <var> url-string</var></code></td></tr>
141 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
142 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
143 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
145 <p>The <code class="directive">CacheDisable</code> directive instructs
146 <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to <em>not</em> cache urls at or below
147 <var>url-string</var>.</p>
149 <div class="example"><h3>Example</h3><p><code>
150 CacheDisable /local_files
154 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
155 <div class="directive-section"><h2><a name="CacheEnable" id="CacheEnable">CacheEnable</a> <a name="cacheenable" id="cacheenable">Directive</a></h2>
156 <table class="directive">
157 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Enable caching of specified URLs using a specified storage
159 <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>
160 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
161 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
162 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
164 <p>The <code class="directive">CacheEnable</code> directive instructs
165 <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to cache urls at or below
166 <var>url-string</var>. The cache storage manager is specified with the
167 <var>cache_type</var> argument. <var>cache_type</var> <code> mem</code>
168 instructs <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the memory based storage
169 manager implemented by <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code>.
170 <var>cache_type</var> <code>disk</code> instructs
171 <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the disk based storage manager
172 implemented by <code class="module"><a href="../mod/mod_disk_cache.html">mod_disk_cache</a></code>.
173 <var>cache_type</var> <code>fd</code> instructs
174 <code class="module"><a href="../mod/mod_cache.html">mod_cache</a></code> to use the file descriptor cache implemented
175 by <code class="module"><a href="../mod/mod_mem_cache.html">mod_mem_cache</a></code>.</p>
176 <p>In the event that the URL space overlaps between different
177 <code class="directive">CacheEnable</code> directives (as in the example below),
178 each possible storage manager will be run until the first one that
179 actually processes the request. The order in which the storage managers are
180 run is determined by the order of the <code class="directive">CacheEnable</code>
181 directives in the configuration file.</p>
183 <div class="example"><p><code>
184 CacheEnable mem /manual<br />
185 CacheEnable fd /images<br />
186 CacheEnable disk /<br />
190 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
191 <div class="directive-section"><h2><a name="CacheForceCompletion" id="CacheForceCompletion">CacheForceCompletion</a> <a name="cacheforcecompletion" id="cacheforcecompletion">Directive</a></h2>
192 <table class="directive">
193 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Percentage of document served, after which the server
194 will complete caching the file even if the request is cancelled.</td></tr>
195 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheForceCompletion <var>Percentage</var></code></td></tr>
196 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheForceCompletion 60</code></td></tr>
197 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
198 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
199 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
201 <p>Ordinarily, if a request is cancelled while the response is being
202 cached and delivered to the client the processing of the response will
203 stop and the cache entry will be removed. The
204 <code class="directive">CacheForceCompletion</code> directive specifies a
205 threshold beyond which the document will continue to be cached to
206 completion, even if the request is cancelled.</p>
208 <p>The threshold is a percentage specified as a value between
209 <code>1</code> and <code>100</code>. A value of <code>0</code>
210 specifies that the default be used. A value of <code>100</code>
211 will only cache documents that are served in their entirety. A value
212 between 60 and 90 is recommended.</p>
214 <div class="example"><p><code>
215 CacheForceCompletion 80
218 <div class="warning"><h3>Note:</h3>
219 This feature is currently <em>not</em> implemented.
223 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
224 <div class="directive-section"><h2><a name="CacheIgnoreCacheControl" id="CacheIgnoreCacheControl">CacheIgnoreCacheControl</a> <a name="cacheignorecachecontrol" id="cacheignorecachecontrol">Directive</a></h2>
225 <table class="directive">
226 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore the fact that the client requested the content not be
228 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheIgnoreCacheControl On|Off</code></td></tr>
229 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheIgnoreCacheControl Off</code></td></tr>
230 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
231 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
232 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
234 <p>Ordinarily, documents with no-cache or no-store header values will not be stored in the cache.
235 The <code class="directive">CacheIgnoreCacheControl</code> directive allows this behavior to be overridden.
236 <code class="directive">CacheIgnoreCacheControl</code> On tells the server to attempt to cache the document
237 even if it contains no-cache or no-store header values. Documents requiring authorization will
238 <em>never</em> be cached.</p>
240 <div class="example"><p><code>
241 CacheIgnoreCacheControl On
245 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
246 <div class="directive-section"><h2><a name="CacheIgnoreHeaders" id="CacheIgnoreHeaders">CacheIgnoreHeaders</a> <a name="cacheignoreheaders" id="cacheignoreheaders">Directive</a></h2>
247 <table class="directive">
248 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Do not store the given HTTP header(s) in the cache.
250 <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>
251 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheIgnoreHeaders None</code></td></tr>
252 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
253 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
254 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
256 <p>According to RFC 2616, hop-by-hop HTTP headers are not stored in
257 the cache. The following HTTP headers are hop-by-hop headers and thus
258 do not get stored in the cache in <em>any</em> case regardless of the
259 setting of <code class="directive">CacheIgnoreHeaders</code>:</p>
262 <li><code>Connection</code></li>
263 <li><code>Keep-Alive</code></li>
264 <li><code>Proxy-Authenticate</code></li>
265 <li><code>Proxy-Authorization</code></li>
266 <li><code>TE</code></li>
267 <li><code>Trailers</code></li>
268 <li><code>Transfer-Encoding</code></li>
269 <li><code>Upgrade</code></li>
272 <p><code class="directive">CacheIgnoreHeaders</code> specifies additional HTTP
273 headers that should not to be stored in the cache. For example, it makes
274 sense in some cases to prevent cookies from being stored in the cache.</p>
276 <p><code class="directive">CacheIgnoreHeaders</code> takes a space separated list
277 of HTTP headers that should not be stored in the cache. If only hop-by-hop
278 headers not should be stored in the cache (the RFC 2616 compliant
279 behaviour), <code class="directive">CacheIgnoreHeaders</code> can be set to
280 <code>None</code>.</p>
282 <div class="example"><h3>Example 1</h3><p><code>
283 CacheIgnoreHeaders Set-Cookie
286 <div class="example"><h3>Example 2</h3><p><code>
287 CacheIgnoreHeaders None
290 <div class="warning"><h3>Warning:</h3>
291 If headers like <code>Expires</code> which are needed for proper cache
292 management are not stored due to a
293 <code class="directive">CacheIgnoreHeaders</code> setting, the behaviour of
294 mod_cache is undefined.
298 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
299 <div class="directive-section"><h2><a name="CacheIgnoreNoLastMod" id="CacheIgnoreNoLastMod">CacheIgnoreNoLastMod</a> <a name="cacheignorenolastmod" id="cacheignorenolastmod">Directive</a></h2>
300 <table class="directive">
301 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>Ignore the fact that a response has no Last Modified
303 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheIgnoreNoLastMod On|Off</code></td></tr>
304 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheIgnoreNoLastMod Off</code></td></tr>
305 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
306 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
307 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
309 <p>Ordinarily, documents without a last-modified date are not cached.
310 Under some circumstances the last-modified date is removed (during
311 <code class="module"><a href="../mod/mod_include.html">mod_include</a></code> processing for example) or not provided
312 at all. The <code class="directive">CacheIgnoreNoLastMod</code> directive
313 provides a way to specify that documents without last-modified dates
314 should be considered for caching, even without a last-modified date.
315 If neither a last-modified date nor an expiry date are provided with
316 the document then the value specified by the
317 <code class="directive">CacheDefaultExpire</code> directive will be used to
318 generate an expiration date.</p>
320 <div class="example"><p><code>
321 CacheIgnoreNoLastMod On
325 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
326 <div class="directive-section"><h2><a name="CacheLastModifiedFactor" id="CacheLastModifiedFactor">CacheLastModifiedFactor</a> <a name="cachelastmodifiedfactor" id="cachelastmodifiedfactor">Directive</a></h2>
327 <table class="directive">
328 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The factor used to compute an expiry date based on the
329 LastModified date.</td></tr>
330 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheLastModifiedFactor <var>float</var></code></td></tr>
331 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheLastModifiedFactor 0.1</code></td></tr>
332 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
333 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
334 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
336 <p>In the event that a document does not provide an expiry date but does
337 provide a last-modified date, an expiry date can be calculated based on
338 the time since the document was last modified. The
339 <code class="directive">CacheLastModifiedFactor</code> directive specifies a
340 <var>factor</var> to be used in the generation of this expiry date
341 according to the following formula:
343 <code>expiry-period = time-since-last-modified-date * <var>factor</var>
344 expiry-date = current-date + expiry-period</code>
346 For example, if the document was last modified 10 hours ago, and
347 <var>factor</var> is 0.1 then the expiry-period will be set to
348 10*0.1 = 1 hour. If the current time was 3:00pm then the computed
349 expiry-date would be 3:00pm + 1hour = 4:00pm.
351 If the expiry-period would be longer than that set by
352 <code class="directive">CacheMaxExpire</code>, then the latter takes
355 <div class="example"><p><code>
356 CacheLastModifiedFactor 0.5
360 <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div>
361 <div class="directive-section"><h2><a name="CacheMaxExpire" id="CacheMaxExpire">CacheMaxExpire</a> <a name="cachemaxexpire" id="cachemaxexpire">Directive</a></h2>
362 <table class="directive">
363 <tr><th><a href="directive-dict.html#Description">Description:</a></th><td>The maximum time in seconds to cache a document</td></tr>
364 <tr><th><a href="directive-dict.html#Syntax">Syntax:</a></th><td><code>CacheMaxExpire <var>seconds</var></code></td></tr>
365 <tr><th><a href="directive-dict.html#Default">Default:</a></th><td><code>CacheMaxExpire 86400 (one day)</code></td></tr>
366 <tr><th><a href="directive-dict.html#Context">Context:</a></th><td>server config, virtual host</td></tr>
367 <tr><th><a href="directive-dict.html#Status">Status:</a></th><td>Experimental</td></tr>
368 <tr><th><a href="directive-dict.html#Module">Module:</a></th><td>mod_cache</td></tr>
370 <p>The <code class="directive">CacheMaxExpire</code> directive specifies the maximum number of
371 seconds for which cachable HTTP documents will be retained without checking the origin
372 server. Thus, documents will be out of date at most this number of seconds. This maximum
373 value is enforced even if an expiry date was supplied with the document.</p>
375 <div class="example"><p><code>
376 CacheMaxExpire 604800
381 <div class="bottomlang">
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384 </div><div id="footer">
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