晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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<article class="contentwrapper ls-col-3-5 clearfix"><div class="nav-bar ls-spacer-micro-top"><div class="prev">&#171 <a href="ServSecurity_Help.html">Server Security</a></div><div class="center"><a href="config.html">Configuration</a></div><div class="next"><a href="PageSpeed_Config.html">PageSpeed Config</a> &#187;</div></div>
<h1>Page Cache Settings</h1><h2 id="top">Table of Contents</h2><section class="toc"><section class="toc-row"><header>Cache Storage Settings</header><p>
<a href="#cacheEngine">Cache Features</a> | <a href="#cacheStorePath">Storage Path</a> | <a href="#litemage">Enable LiteMage</a> | <a href="#cacheMgrStorePath">Cache Manager Path</a> | <a href="#pubStoreExpireMinutes">Public Storage Expire (minutes)</a> | <a href="#purgeNoHitTimeout">No Hit Expire (minutes)</a></p></section>
<section class="toc-row"><header>Cache Policy</header><p>
<a href="#checkPublicCache">Check Public Cache</a> | <a href="#checkPrivateCache">Check Private Cache</a> | <a href="#respectCacheable">Respect Cacheable</a> | <a href="#cachePolicy:maxCacheObjSize">Max Object Size</a> | <a href="#cachePolicy:maxStaleAge">Cache Stale Age (seconds)</a> | <a href="#cachePolicy:cacheKeyMod">Cache Key Modifications</a> | <a href="#cachePolicy:expireInSeconds">Cache Expire Time (seconds)</a> | <a href="#cachePolicy:privateExpireInSeconds">Private Cache Expire Time (seconds)</a> | <a href="#cachePolicy:microCache5xx">Micro Cache 5XX Response</a> | <a href="#cachePolicy:enablePostCache">Enable POST cache</a></p></section>
<section class="toc-row"><header>Do-Not-Cache URL</header><p>
<a href="#noCacheUrl">Do-Not-Cache URL</a></p></section>
<section class="toc-row"><header>Do-Not-Cache Domains</header><p>
<a href="#noCacheDomain">No Cache Domain</a></p></section>
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<section><div class="helpitem"><article class="ls-helpitem"><div><header id="cacheEngine"><h3>Cache Features<span class="ls-permlink"><a href="#cacheEngine"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies which cache features to enable. <span class="val">On</span> enables the cache engine while <span class="val">Crawler</span> and <span class="val">ESI</span> enables those respective features. Features enabled globally at the Server level can be overriden at the Virtual Host level.<br/><br/> Setting Enable LiteMage to <span class="val">On</span> at the Virtual Host level will override this setting, enabling all features.<br/><br/> Default value: Everything enabled</p> <h4>Syntax</h4><p>Select from checkbox</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cacheStorePath"><h3>Storage Path<span class="ls-permlink"><a href="#cacheStorePath"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies the directory for holding cached objects. Currently, LiteSpeed Cache stores each object in its own file. The filename is a hash of the object key. Multiple levels of directories will be created in order to avoid holding too many files in one directory. This value must be set at the Server level in order to enable cache. Virtual Host level settings will override Server level settings.</p> <h4>Syntax</h4><p>path</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> Assign a dedicated disk or disk array as the cache storage. RAID0 is recommended.<br/><br/> It is recommended to set a different cache storage path for each Virtual Host to prevent purge all requests from affecting other Virtual Hosts.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="litemage"><h3>Enable LiteMage<span class="ls-permlink"><a href="#litemage"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Enables LiteMage Cache for Magento Stores.<br/><br/> When set to 'On' the server will also try to use shared private cache information to speed up page load time for first time visitors. Select 'Safe' to disable this feature.</p> <h4>Syntax</h4><p>Select from drop down list</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> This setting will not work if your LiteSpeed license does not have the LiteMage module enabled.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cacheMgrStorePath"><h3>Cache Manager Path<span class="ls-permlink"><a href="#cacheMgrStorePath"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies the directory used to store cache manager files. These files are stored in <b>Storage Path</b> by default.</p> <h4>Syntax</h4><p>path</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> A separate location on a fast disk is recommended to prevent the accidental removal of cache manager files. Only set to a location on a RAM disk if cache storage is also saved on a RAM disk.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="pubStoreExpireMinutes"><h3>Public Storage Expire (minutes)<span class="ls-permlink"><a href="#pubStoreExpireMinutes"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>The maximum age of a cached file before the server will attempt to physically remove it. This removal operation will occur once per day to prevent cache storage from growing too large. Minimum setting is 60 minutes.</p> <h4>Syntax</h4><p>Integer number</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> Set this value to a time greater than your longest TTL to help prevent the removal of still valid cache files.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="purgeNoHitTimeout"><h3>No Hit Expire (minutes)<span class="ls-permlink"><a href="#purgeNoHitTimeout"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>The maximum number of minutes a cached file will remain in cache storage without a cache hit before being physically removed by the server. Set to 0 to disable this feature.<br/><br/> Default value: 0</p> <h4>Syntax</h4><p>Integer number</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="checkPublicCache"><h3>Check Public Cache<span class="ls-permlink"><a href="#checkPublicCache"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to check against the public cache for URLs requested in the current context. Can be set at the server level, virtual host level, or context level.</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="checkPrivateCache"><h3>Check Private Cache<span class="ls-permlink"><a href="#checkPrivateCache"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to check against the private cache for URLs requested in the current context. Can be set at the server, virtual host, or context level.</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="respectCacheable"><h3>Respect Cacheable<span class="ls-permlink"><a href="#respectCacheable"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Respect the value of regular "Cache-Control" response headers when LiteSpeed-specific cache control has not been provided.<br/><br/> LiteSpeed-specific cache control includes the X-litespeed-cache-control response header and the cache-control environment variable set via rewrite rule.</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> This setting is enabled by default.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cachePolicy:maxCacheObjSize"><h3>Max Object Size<span class="ls-permlink"><a href="#cachePolicy:maxCacheObjSize"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies the maximum size of an object, up to 100M, that can be stored in the cache directory.<br/><br/> Default value: 10M</p> <h4>Syntax</h4><p>Integer number</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cachePolicy:maxStaleAge"><h3>Cache Stale Age (seconds)<span class="ls-permlink"><a href="#cachePolicy:maxStaleAge"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies how long an object will continue to be served from cache after it has expired but before a new cached copy is available. The default is "10" seconds.</p> <h4>Syntax</h4><p>Integer number</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cachePolicy:cacheKeyMod"><h3>Cache Key Modifications<span class="ls-permlink"><a href="#cachePolicy:cacheKeyMod"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Makes some requests more cache-friendly by allowing junk query string parameters to be dropped from URLs.</p> <h4>Syntax</h4><p><span class="val">clear</span> discards all previous configurations, <span class="val">-qs:[string]</span> drop all query strings where the name matches [string] exactly, or <span class="val">-qs:utm*</span> drop all query strings where the name part starts with [string]. Input one rule per line.</p> <h4>Example</h4><div class="ls-example"><span class="val">-qs:utm*</span> drops all query strings where the name part starts with "utm".<br/> <span class="val">-qs:gclid</span> drops all query strings where the name matches "gclid" exactly.</div></article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cachePolicy:expireInSeconds"><h3>Cache Expire Time (seconds)<span class="ls-permlink"><a href="#cachePolicy:expireInSeconds"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies how long an object will be cached. The default is "86400" seconds (one day).</p> <h4>Syntax</h4><p>Integer number</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cachePolicy:privateExpireInSeconds"><h3>Private Cache Expire Time (seconds)<span class="ls-permlink"><a href="#cachePolicy:privateExpireInSeconds"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies how long an object will be cached in private cache. The default is "60" seconds.</p> <h4>Syntax</h4><p>Integer number</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cachePolicy:microCache5xx"><h3>Micro Cache 5XX Response<span class="ls-permlink"><a href="#cachePolicy:microCache5xx"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Cache pages responding with HTTP status code 5xx (500, 503, etc) for 10 seconds when the cache response header indicates that the page is cacheable.<br/><br/> Default values:<br/> <b>Server level:</b> Yes<br/> <b>VH level:</b> Inherit Server level setting<br/> <b>Context-level</b> Inherit VH level setting</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> Enabling this setting is useful for avoiding bad requests but can also act as some added DDoS protection.</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="cachePolicy:enablePostCache"><h3>Enable POST cache<span class="ls-permlink"><a href="#cachePolicy:enablePostCache"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>Specifies if POST requests can be cached using the "x-litespeed-cache-control" header.<br/><br/> Default value: <span class="val">No</span></p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="noCacheUrl"><h3>Do-Not-Cache URL<span class="ls-permlink"><a href="#noCacheUrl"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>A list of URL segments where any URL containing these listed segments will not be cached. String matching is used. Regular expressions are not supported. Can be set at the server or virtual host level. URL segments listed at the server level are inherited by all virtual hosts and added to their <b>Do-Not-Cache URL</b> lists.</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> You can add comments by starting a line with "#".</p> </article> </div>
<div class="helpitem"><article class="ls-helpitem"><div><header id="noCacheDomain"><h3>No Cache Domain<span class="ls-permlink"><a href="#noCacheDomain"></a></span><span class="top"><a href="#top">&#8657;</a></span></h3></header></div><h4>Description</h4><p>A comma-separated list of domains that will not be cached.</p> <h4>Syntax</h4><p>Comma-separated list. Domain names are case insensitive and the leading "www." should be removed. The wildcard characters "*" and "?" are allowed. "?" only replaces one character. "*" replaces any number of characters. For example, "*.mydomain.com" will match all subdomains of mydomain.com. Duplicate domain names are not allowed.</p> </article> </div>
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