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<!DOCTYPE html> <head> <meta charset="utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" /> <title>OpenLiteSpeed Users' Manual - Load Balancer Context</title> <meta name="description" content="OpenLiteSpeed Users' Manual - Load Balancer 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/ols_logo.svg" alt="openlitespeed logo" width="150px"/> </figure> <h2 class="ls-text-thin"> OpenLiteSpeed Web Server <a href="index.html"> Users' Manual</a> </h2> <h3 class="ls-text-muted">Version 1.8 — Rev. 9</h3> <hr/> <div> <ul> <li><a href="license.html">License</a></li> <li><a href="intro.html">Introduction</a></li> <li><a href="install.html">Installation</a></li> <li> <a href="admin.html">Administration</a> <ul class="level2"> <li><a href="ServerStat_Help.html">Service Manager</a></li> <li><a href="Real_Time_Stats_Help.html">Real-Time Stats</a></li> </ul> </li> <li><a href="security.html">Security</a></li> <li> <a href="config.html">Configuration</a> <ul class="level2"> <li><a href="ServGeneral_Help.html">Server General</a></li> <li><a href="ServLog_Help.html">Server Log</a></li> <li><a href="ServTuning_Help.html">Server Tuning</a></li> <li><a href="ServSecurity_Help.html">Server Security</a></li> <li><a href="ExtApp_Help.html">External Apps</a></li> <ul class="level3"> <li><a href="External_FCGI.html">Fast CGI App</a></li> <li><a href="External_FCGI_Auth.html">Fast CGI Authorizer</a></li> <li><a href="External_LSAPI.html">LSAPI App</a></li> <li><a href="External_Servlet.html">Servlet Engine</a></li> <li><a href="External_WS.html">Web Server</a></li> <li><a href="External_PL.html">Piped logger</a></li> <li><a href="External_LB.html">Load Balancer</a></li> </ul> <li><a href="ScriptHandler_Help.html">Script Handler</a></li> <li><a href="App_Server_Help.html">App Server Settings</a></li> <li><a href="Module_Help.html">Module Configuration</a></li> <li><a href="Listeners_General_Help.html">Listener General</a></li> <li><a href="Listeners_SSL_Help.html">Listener SSL</a></li> <li><a href="Templates_Help.html">Virtual Host Templates</a></li> <li><a href="VirtualHosts_Help.html">Virtual Host Basic</a></li> <li><a href="VHGeneral_Help.html">Virtual Host General</a></li> <li><a href="VHSecurity_Help.html">Virtual Host Security</a></li> <li><a href="VHSSL_Help.html">Virtual Host SSL</a></li> <li><a href="Rewrite_Help.html">Rewrite</a></li> <li><a href="Context_Help.html">Context</a></li> <ul class="level3"> <li><a href="Static_Context.html">Static Context</a></li> <li> <a href="Java_Web_App_Context.html">Java Web App Context</a> </li> <li><a href="Servlet_Context.html">Servlet Context</a></li> <li><a href="FCGI_Context.html">Fast CGI Context</a></li> <li><a href="LSAPI_Context.html">LSAPI Context</a></li> <li><a href="Proxy_Context.html">Proxy Context</a></li> <li><a href="CGI_Context.html">CGI Context</a></li> <li><span class="current"><a href="LB_Context.html">Load Balancer Context</a></span></li> <li><a href="Redirect_Context.html">Redirect Context</a></li> <li><a href="App_Server_Context.html">App Server Context</a></li> <li><a href="Module_Context.html">Module Handler Context</a></li> </ul> <li><a href="VHWebSocket_Help.html">Web Socket Proxy</a></li> </ul> </li> <li><a href="webconsole.html">Web Console</a> <ul class="level2"> <li><a href="AdminGeneral_Help.html">Admin Console General</a></li> <li><a href="AdminSecurity_Help.html">Admin Console Security</a></li> <li> <a 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="CGI_Context.html">CGI Context</a></div><div class="center"><a href="Context_Help.html">Context</a></div><div class="next"><a href="Redirect_Context.html">Redirect Context</a> »</div></div> <h1>Load Balancer Context</h1><h2 id="top">Table of Contents</h2><section class="toc"><section class="toc-row"><header><a href="#lbContext">Load Balancer Context</a></header><p> <a href="#expuri">URI</a> | <a href="#lbapp">Load Balancer</a> | <a href="#extraHeaders">Header Operations</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="#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="lbContext"><h3>Load Balancer Context<span class="ls-permlink"><a href="#lbContext"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Like other external applications, load balancer worker applications cannot be used directly. They must be mapped to a URL through a context. A Load Balancer Context will associate a URI to be load balanced by the load balancer workers.</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="lbapp"><h3>Load Balancer<span class="ls-permlink"><a href="#lbapp"></a></span><span class="top"><a href="#top">⇑</a></span></h3></header></div><h4>Description</h4><p>Specifies the name of the load balancer to be associated to this context. This load balancer is a virtual application, and must be defined in the <span class="tagP"><a href="#ExtApp_Help">External Apps</a></span> section at the server or virtual host level.</p> <h4>Syntax</h4><p>Select from drop down list</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="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="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> 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 © 2013-2020. <a href="https://www.litespeedtech.com">LiteSpeed Technologies Inc.</a> All rights reserved.</footer> </div></div> </body> </html>
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