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<!DOCTYPE html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <title>LiteSpeed Web Server Users' Manual - App Server Context</title> <meta name="description" content="LiteSpeed Web Server Users' Manual - App Server Context." /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <meta name="robots" content="noindex"> <link rel="shortcut icon" href="img/favicon.ico" /> <link rel="stylesheet" type="text/css" href="css/hdoc.css"> </head> <body> <div class="pagewrapper clearfix"><aside class="sidetree ls-col-1-5"> <figure> <img src="img/lsws_logo.svg" alt="lightspeed web server logo" width="100px"/> </figure> <h2 class="ls-text-thin"> LiteSpeed Web Server <br /> <span class="current"><a href="index.html">Users' Manual</a></span> </h2> <h3 class="ls-text-muted">Version 6.3 — Rev. 4</h3> <hr/> <div> <ul> <li><a href="license.html">License Enterprise</a></li> <li><a href="intro.html">Introduction</a></li> <li><a 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href="AdminListeners_General_Help.html"> Admin Listener General </a> </li> <li> <a href="AdminListeners_SSL_Help.html">Admin Listener SSL</a> </li> </ul> </li> </ul> </div> </aside> <article class="contentwrapper ls-col-3-5 clearfix"><div class="nav-bar ls-spacer-micro-top"><div class="prev">« <a href="Redirect_Context.html">Redirect Context</a></div><div class="center"><a href="Context_Help.html">Context</a></div><div class="next"><a href="Rails_Context.html">Rack/Rails Context</a> »</div></div> <h1>App Server Context</h1><h2 id="top">Table of Contents</h2><section class="toc"><section class="toc-row"><header><a href="#appServerContext">App Server Context</a></header><p> <a href="#expuri">URI</a> | <a href="#as_location">Location</a> | <a href="#binPath">Binary Path</a> | <a href="#appType">Application Type</a> | <a href="#as_startupfile">Startup File</a> | <a href="#appserverEnv">Run-Time Mode</a> | <a href="#maxConns">Max Connections</a> | <a href="#env">Environment</a> | <a href="#enableExpires">Enable Expires</a> | <a href="#expiresDefault">Expires Default</a> | <a href="#expiresByType">Expires By Type</a> | <a href="#extraHeaders">Header Operations</a> | <a href="#indexFiles">Index Files</a> | <a href="#autoIndex">Auto Index</a> | <a href="#allowOverride">Allow Override</a> | <a href="#realm">Realm</a> | <a href="#authName">Authentication Name</a> | <a href="#required">Require (Authorized Users/Groups)</a> | <a href="#accessAllowed">Access Allowed</a> | <a href="#accessDenied">Access Denied</a> | <a href="#extAuthorizer">Authorizer</a> | <a href="#enableRewrite">Enable Rewrite</a> | <a href="#rewriteInherit">Rewrite Inherit</a> | <a href="#rewriteBase">Rewrite Base</a> | <a href="#rewriteRules">Rewrite Rules</a> | <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:enableCache">Publicly Cache All</a> | <a href="#cachePolicy:expireInSeconds">Cache Expire Time (seconds)</a> | <a href="#cachePolicy:enablePrivateCache">Privately Cache All</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> | <a href="#addDefaultCharset">Add Default Charset</a> | <a href="#defaultCharsetCustomized">Customized Default Charset</a> | <a href="#enableIpGeo">Enable GeoLocation Lookup</a></p></section> </section> <section><div class="helpitem"><article class="ls-helpitem"><div><header id="appServerContext"><h3>App Server Context<span class="ls-permlink"><a href="#appServerContext"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>An App Server Context provides an easy way to configure a Ruby Rack/Rails, WSGI, or Node.js application. To add a an application through an App Server Context, only mounting the URL and the application's root directory is required. There is no need to go through all the trouble to define an external application, add a 404 handler, and rewrite rules, etc.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="expuri"><h3>URI<span class="ls-permlink"><a href="#expuri"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the URI for this context.</p> <h4>Syntax</h4><p>The URI can be a plain URI (starting with "/") or a Perl compatible regular expression URI (starting with "exp:"). If a plain URI ends with a "/", then this context will include all sub-URIs under this URI. If the context maps to a directory on the file system, a trailing "/" must be added.</p> <h4>See Also</h4><p class="ls-text-small"><span class="tagl"><a href="#location">Location</a></span></p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="as_location"><h3>Location<span class="ls-permlink"><a href="#as_location"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the corresponding location of this context in the file system.<br/><br/> Default value: $DOC_ROOT + <span class="tagl"><a href="#expuri">URI</a></span></p> <h4>Syntax</h4><p>It can be an absolute path or path relative to $SERVER_ROOT, $VH_ROOT, or $DOC_ROOT. $DOC_ROOT is the default relative path, and can be omitted.<br/><br/> If the <span class="tagl"><a href="#expuri">URI</a></span> is a regular expression, then the matched sub-string can be used to form the "Root" string. The matched sub-string can be referenced with the values "$1" - "$9". "$0" and "&" can be used to reference the whole matched string. Additionally, a query string can be set by appending a "?" followed by the query string. Be careful. "&" should be escaped as "\&" in the query string.</p> <h4>Example</h4><div class="ls-example">A plain URI like <span class="val">/examples/</span> with <span class="tagl"><a href="#location">Location</a></span> set to <span class="val">/home/john/web_examples</span> will map the request "/examples/foo/bar.html" to file "/home/john/web_examples/foo/bar.html".<br/> To simulate Apache's mod_userdir, set URI to <span class="val">exp: ^/~([A-Za-z0-9]+)(.*)</span>, set <span class="tagl"><a href="#location">Location</a></span> to <span class="val">/home/$1/public_html$2</span>. With these settings, a request of URI /~john/foo/bar.html will map to file /home/john/public_html/foo/bar.html.</div><h4>See Also</h4><p class="ls-text-small"><span class="tagl"><a href="#expuri">URI</a></span></p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="binPath"><h3>Binary Path<span class="ls-permlink"><a href="#binPath"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>The location of the App Server application binary.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="appType"><h3>Application Type<span class="ls-permlink"><a href="#appType"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>The type of application used for this context. Rack/Rails, WSGI, or Node.js are supported.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="as_startupfile"><h3>Startup File<span class="ls-permlink"><a href="#as_startupfile"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>The location of file used to start the application, relative to the application root directory.<br/><br/> Default startup file names include 'config.ru' for Rack/Rails, 'wsgi.py' and 'passenger_wsgi.py' for WSGI, and 'app.js' for NodeJS.</p> <h4>Syntax</h4><p>Path relative to application root directory</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="appserverEnv"><h3>Run-Time Mode<span class="ls-permlink"><a href="#appserverEnv"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies which mode the application will be running as: "Development", "Production", or "Staging". The default is "Production".</p> <h4>Syntax</h4><p>Select from drop down list</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="maxConns"><h3>Max Connections<span class="ls-permlink"><a href="#maxConns"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the maximum number of concurrent connections that can be established between the server and an external application. This setting controls how many requests can be processed concurrently by an external application, however, the real limit also depends on the external application itself. Setting this value higher will not help if the external application is not fast enough or cannot scale to a large number of concurrent requests.</p> <h4>Syntax</h4><p>Integer number</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> Setting a high value does not directly translate to higher performance. Setting the limit to a value that will not overload the external application will provide the best performance/throughput.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="env"><h3>Environment<span class="ls-permlink"><a href="#env"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies extra environment variables for the external application.</p> <h4>Syntax</h4><p>Key=value. Multiple variables can be separated by "ENTER"</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="enableExpires"><h3>Enable Expires<span class="ls-permlink"><a href="#enableExpires"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to generate an Expires header for static files. If enabled, an Expires header will be generated based on <span class="tagl"><a href="#expiresDefault">Expires Default</a></span> and <span class="tagl"><a href="#expiresByType">Expires By Type</a></span>.<br/><br/> This can be set at server, virtual host and context level. Lower level settings will override higher level ones, i.e. context settings will override virtual host settings and virtual host settings will override server settings.</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="expiresDefault"><h3>Expires Default<span class="ls-permlink"><a href="#expiresDefault"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies default settings for Expires header generation. This setting takes effect when <span class="tagl"><a href="#enableExpires">Enable Expires</a></span> is set to "Yes". It can be overridden by <span class="tagl"><a href="#expiresByType">Expires By Type</a></span>. Do not set this default at the server or virtual host level unless you have to, since it will generate Expires headers for all pages. Most of time this should be set at the context level for certain directories that do not change often. If there is no default setting, no Expires header will be generated for types not specified in <span class="tagl"><a href="#expiresByType">Expires By Type</a></span>.</p> <h4>Syntax</h4><p>A|Mseconds<br/> The file will expire after base time(A|M) plus specified seconds. Base time "A" sets the value to the client's access time and "M" to the file's last modified time.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="expiresByType"><h3>Expires By Type<span class="ls-permlink"><a href="#expiresByType"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies Expires header settings for individual MIME types.</p> <h4>Syntax</h4><p>Comma delimited list of "MIME-type=A|Mseconds". The file will expire after base time (A|M) plus specified seconds.<br/><br/> Base time "A" sets the value to the client's access time and "M" to the file's last modified time. MIME-type accepts wildcard "*", like image/*.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="extraHeaders"><h3>Header Operations<span class="ls-permlink"><a href="#extraHeaders"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies additional response/request headers to be added. Multiple header directives can be added with one directive per line. "NONE" can be used to disable parent header inheritance. If no directive is provided 'Header' is assumed.</p> <h4>Syntax</h4><p>[Header]|RequestHeader [condition] set|append|merge|add|unset header [value] [early|env=[!]variable]</p> <h4>Example</h4><div class="ls-example">set Cache-control no-cache<br/> append Cache-control no-store<br/> Header set My-header cust_header_val<br/> RequestHeader set My-req-header cust_req_header_val</div><h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> Syntax and usage are similar to <a href="https://httpd.apache.org/docs/2.2/mod/mod_headers.html#header" target="_blank" rel="noopener noreferrer">Apache's mod_headers directives</a> for supported operations.<br/><br/> <span title="Information" class="ls-icon-info"></span> The 'Header' directive is is optional and can be excluded or left in when copying rules from elsewhere without issue.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="indexFiles"><h3>Index Files<span class="ls-permlink"><a href="#indexFiles"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies names of index files that will be searched sequentially when a URL is mapped to a directory. You can customize it at the server, virtual host, and context level.</p> <h4>Syntax</h4><p>Comma-delimited list of index filenames.</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> Only set index files that you need.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="autoIndex"><h3>Auto Index<span class="ls-permlink"><a href="#autoIndex"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to generate a directory index on the fly when index files listed in <span class="tagl"><a href="#indexFiles">Index Files</a></span> are not available in a directory. This option is customizable at the virtual host and context level, and is inherited along the directory tree until it is explicitly overridden. You can customize the generated index page. Please check online wiki How-tos.</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Security" class="ls-icon-security"></span> It is recommended to turn off Auto Index wherever possible to prevent revealing confidential data.</p> <h4>See Also</h4><p class="ls-text-small"><span class="tagl"><a href="#indexFiles">Index Files</a></span>, <span class="tagl"><a href="#autoIndexURI">Auto Index URI</a></span></p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="allowOverride"><h3>Allow Override<span class="ls-permlink"><a href="#allowOverride"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies what directives in an access control file are allowed. An access control file can be placed in a directory to control the accessibility of files under that directory.<br/> <ul> <li>When nothing is checked, inherited default settings will be used.</li> <li>When <span class="val">None</span> is checked, access control files will be ignored.</li> <li> When <span class="val">Limit</span> is checked, directives "Allow", "Deny", and "Order" are allowed. <Limit> and <LimitExcept> directives are also allowed with limited support for GET, HEAD, and POST requests. </li> <li> When <span class="val">Auth</span> is checked, directives "AuthGroupFile", "AuthName", "AuthType", "AuthUserFile", "Require", and "Satisfy" are allowed. <Limit> and <LimitExcept> directives are also allowed with limited support for GET, HEAD, and POST requests. </li> <li> When <span class="val">FileInfo</span> is checked, directives "AddDefaultCharset", "AddType", "DefaultType", "ForceType", "Redirect", "RedirectPermanent", "RedirectTemp", "RewriteBase", "RewriteCond", "RewriteEngine", "RewriteOptions", and "RewriteRule" are allowed. </li> <li> When <span class="val">Indexes</span> is checked, directives "DirectoryIndex", "ExpiresActive", "ExpiresByType", and "ExpiresDefault" are allowed. </li> <li>When <span class="val">Options</span> is checked, directive "Options" is allowed.</li> </ul><br/> Allow Override configuration is available at the Server, Virtual Host, and Context levels. If a configuration is unchecked at the Server level, those controlled directives will be disabled for the entire server regardless of settings at lower levels. Lower levels can disable a setting that is enabled at a higher level, but cannot enable a setting that is disabled at an upper level.<br/><br/> Default values:<br/> <b>Server level:</b> "None" (ignore access control file)<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 checkbox</p> <h4>Tips</h4><p><span title="Performance" class="ls-icon-performance"></span> If there is no need for directory level configuration customization, check <span class="val">None</span>.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="realm"><h3>Realm<span class="ls-permlink"><a href="#realm"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the authorization realm for this context. When specified, a valid username and password must be provided in order to access this context. <span class="tagl"><a href="VHSecurity_Help.html#realms">Authorization Realms</a></span> are set up in the <span class="tagP"><a href="#VHSecurity_Help">Virtual Host Security</a></span> section. This setting uses each realm's <span class="tagl"><a href="VHSecurity_Help.html#realmName">Realm Name</a></span>.</p> <h4>Syntax</h4><p>Select from drop down list</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="authName"><h3>Authentication Name<span class="ls-permlink"><a href="#authName"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies an alternative name for the authorization realm for the current context. If not specified, the original realm name will be used. The authentication name is displayed on the browser's login pop-up.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="required"><h3>Require (Authorized Users/Groups)<span class="ls-permlink"><a href="#required"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies which user/group can access this context. This allows you to use one user/group database (specified in <span class="tagl"><a href="#realm">Realm</a></span>) across a number of contexts, but only allow certain users/groups from that database to access this context.</p> <h4>Syntax</h4><p>Syntax is compatible with Apache's Require directive. For example: <ul> <li><span class="val">user username [username ...]</span><br/> Only listed users can access this context.</li> <li> <span class="val">group groupid [groupid ...]</span><br/> Only users belonging to the listed groups can access this context.</li> </ul> If this setting is not specified, all valid users will be allowed to access this resource.</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="accessAllowed"><h3>Access Allowed<span class="ls-permlink"><a href="#accessAllowed"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies which IPs or sub-networks are allowed to access resources under this context. Together with <span class="tagl"><a href="#accessDenied">Access Denied</a></span> and server/virtual host level access control, accessibility is determined by the smallest scope that a client's IP address falls into.</p> <h4>Syntax</h4><p>Comma-delimited list of IPs/sub-networks.</p> <h4>Example</h4><div class="ls-example">Sub-networks can be written as <span class="val">192.168.1.0/255.255.255.0</span>, <span class="val">192.168.1</span>, or <span class="val">192.168.1.*</span>.</div></article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="accessDenied"><h3>Access Denied<span class="ls-permlink"><a href="#accessDenied"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies which IPs or sub-networks are NOT allowed to access resources under this context. Together with <span class="tagl"><a href="#accessAllowed">Access Allowed</a></span> and server/virtual host-level access control, accessibility is determined by the smallest scope that a client's IP address falls into.</p> <h4>Syntax</h4><p>Comma-delimited list of IPs/sub-networks.</p> <h4>Example</h4><div class="ls-example">Sub-networks can be written as <span class="val">192.168.1.0/255.255.255.0</span>, <span class="val">192.168.1</span>, or <span class="val">192.168.1.*</span>.</div></article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="extAuthorizer"><h3>Authorizer<span class="ls-permlink"><a href="#extAuthorizer"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies an external application that can be used to generate authorized/unauthorized decisions. Currently, only the FastCGI Authorizer is available. For more details about the FastCGI Authorizer role, please visit <a href=" https://fastcgi-archives.github.io/ " target="_blank" rel="noopener noreferrer"> https://fastcgi-archives.github.io/ </a>.</p> <h4>Syntax</h4><p>Select from drop down list</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="enableRewrite"><h3>Enable Rewrite<span class="ls-permlink"><a href="#enableRewrite"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to enable LiteSpeed's URL rewrite engine. This option can be customized at the virtual host or context level, and is inherited along the directory tree until it is explicitly overridden.</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="rewriteInherit"><h3>Rewrite Inherit<span class="ls-permlink"><a href="#rewriteInherit"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to inherit rewrite rules from parent contexts. If rewrite is enabled and not inherited, rewrite base and rewrite rules defined in this context will be used.</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="rewriteBase"><h3>Rewrite Base<span class="ls-permlink"><a href="#rewriteBase"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the base URL for rewrite rules.</p> <h4>Syntax</h4><p>URL</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="rewriteRules"><h3>Rewrite Rules<span class="ls-permlink"><a href="#rewriteRules"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies a list of rewrite rules at the virtual host level.<br/><br/> Do NOT add any document root level rewrite rules here. If you have any document root level rewrite rules from .htaccess, you should instead create a static context with uri "/" and add the rewrite rules there.<br/><br/> A rewrite rule is comprised of one <span class="val">RewriteRule</span> directive and optionally preceded by multiple <span class="val">RewriteCond</span> directives. <ul> <li>Each directive should take only one line.</li> <li> <span class="val">RewriteCond</span> and <span class="val">RewriteRule</span> follow Apache's rewrite directive syntax. Just copy and paste rewrite directives from your Apache configuration files. </li> <li> There are minor differences between LiteSpeed and Apache mod_rewrite implementation: <ul> <li> <span class="val">%\{LA-U:variable\}</span> and <span class="val">%\{LA-F:variable\}</span> are ignored by the LiteSpeed rewrite engine </li> <li> Two new server variables are added in the LiteSpeed rewrite engine: <span class="val">%\{CURRENT_URI\}</span> represents the current URI being processed by the rewrite engine and <span class="val">%\{SCRIPT_NAME\}</span> has the same meaning as the corresponding CGI environment variable. </li> <li> The LiteSpeed rewrite engine will stop processing rewrite rules after encountering an <span class="val">[L]</span> flag to avoid looping while Apache mod_rewrite will stop processing rewrite rules for the current iteration only. This behavior is similar to that of the <span class="val">[END]</span> flag in Apache mod_rewrite. </li> </ul> </li> </ul><br/> The implementation of LiteSpeed's rewrite engine follows Apache's rewrite engine specifications. For more details about rewrite rules, please refer to <a href="https://httpd.apache.org/docs/current/mod/mod_rewrite.html" target="_blank" rel="noopener noreferrer"> Apache's mod_rewrite document </a> and <a href="https://httpd.apache.org/docs/current/rewrite/" target="_blank" rel="noopener noreferrer"> Apache's URL rewriting guide </a>.</p> <h4>Syntax</h4><p>string</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">⇑</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">⇑</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">⇑</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">⇑</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">⇑</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">⇑</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:enableCache"><h3>Publicly Cache All<span class="ls-permlink"><a href="#cachePolicy:enableCache"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Publicly cache all URLs served under the current context (virtual host, or context level).<br/><br/> Virtual hosts configured through Apache's httpd.conf can use the "CacheEnable" and "CacheDisable" directives at the server, virtual host, context, file, and location level or in .htaccess. "CacheEnable" and "CacheDisable" directives are compatible with Apache mod_cache directives. However, when used at the context, file, or location level, or in .htaccess, "CacheEnable" and "CacheDisable" will only be applied to directories below the current level. URL parameters will be ignored.</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> Disabled by default. Do not enabled this setting if you are using any LSCache plugins.</p> </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">⇑</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:enablePrivateCache"><h3>Privately Cache All<span class="ls-permlink"><a href="#cachePolicy:enablePrivateCache"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Privately cache all URLs served under the current context (virtual host, or context level).<br/><br/> A separate cached copy will be made per user based on their IP and set cookies.<br/><br/> Virtual hosts configured through Apache's httpd.conf can use the "CacheEnable private /url" and "CacheDisable private /url" directives at server, virtual host, directory, file, and location levels or in a .htaccess file. "CacheEnable private" and "CacheDisable private" are compatible with Apache's mod_cache directives and will be applied to all directories below the current level. However, when used at the directory, file, or location level, or in a .htaccess file, "CacheEnable private" and "CacheDisable private" will only be applied to directories below the current level. URL parameters will be ignored.</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>Tips</h4><p><span title="Information" class="ls-icon-info"></span> Disabled by default. Do not enabled this setting if you are using any LSCache plugins.</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">⇑</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">⇑</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">⇑</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="addDefaultCharset"><h3>Add Default Charset<span class="ls-permlink"><a href="#addDefaultCharset"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies whether to add a character set tag to the "Content-Type" response header, when content type is either "text/html" or "text/plain" without any parameters. When set to <span class="val">Off</span>, this function is disabled. When set to <span class="val">On</span>, either the character set specified by <span class="tagl"><a href="#defaultCharsetCustomized">Customized Default Charset</a></span> or the default "iso-8859-1" will be added.</p> <h4>Syntax</h4><p>Select from radio box</p> </article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="defaultCharsetCustomized"><h3>Customized Default Charset<span class="ls-permlink"><a href="#defaultCharsetCustomized"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies a character set to be used when <span class="tagl"><a href="#addDefaultCharset">Add Default Charset</a></span> is <span class="val">On</span>. This is optional. The default value is <span class="val">iso-8859-1</span>. This entry has no effect when <span class="tagl"><a href="#addDefaultCharset">Add Default Charset</a></span> is <span class="val">Off</span>.</p> <h4>Syntax</h4><p>Name of a character set.</p> <h4>Example</h4><div class="ls-example">utf-8</div></article> </div> <div class="helpitem"><article class="ls-helpitem"><div><header id="enableIpGeo"><h3>Enable GeoLocation Lookup<span class="ls-permlink"><a href="#enableIpGeo"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p><span class="tag">Enterprise Edition Only</span> Specifies whether to enable/disable IP Geolocation lookup. Can be set at server, virtual host, or context level. IP Geolocation is disabled by default when using value "Not Set".</p> <h4>Syntax</h4><p>Select from radio box</p> <h4>See Also</h4><p class="ls-text-small"><span class="tagl"><a href="ServGeneral_Help.html#useIpInProxyHeader">Use Client IP in Header</a></span>, <span class="tagl"><a href="ServGeneral_Help.html#geoipDBFile">DB File Path</a></span>,</p> </article> </div> </section> </article><div class="ls-col-1-1"><footer class="copyright">Copyright © 2003-2020. <a href="https://www.litespeedtech.com">LiteSpeed Technologies Inc.</a> All rights reserved.</footer> </div></div> </body> </html>