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<html lang="en"><head><meta content="text/html; charset=utf-8" http-equiv="Content-Type"/><link href="/images/docs-stylesheet.css" rel="stylesheet" type="text/css"/><title>Apache Tomcat 8 Configuration Reference (8.5.32) - Overview</title><meta content="Craig R. McClanahan" name="author"/><script data-comments-identifier="tomcat-8.5-doc/config/index" type="application/javascript">
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  </script></head><body><div id="wrapper"><header><div id="header"><div><div><div class="logo noPrint"><a href="http://tomcat.apache.org/"><img alt="Tomcat Home" src="/images/tomcat.png"/></a></div><div style="height: 1px;"></div><div class="asfLogo noPrint"><a href="http://www.apache.org/" target="_blank"><img alt="The Apache Software Foundation" src="/images/asf-logo.svg" style="width: 266px; height: 83px;"/></a></div><h1>Apache Tomcat 8 Configuration Reference</h1><div class="versionInfo">
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          Version 8.5.32,
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          <time datetime="2018-06-20">Jun 20 2018</time></div><div style="height: 1px;"></div><div style="clear: left;"></div></div></div></div></header><div id="middle"><div><div class="noprint" id="mainLeft"><div><nav><div><h2>Links</h2><ul><li><a href="/index.html">Docs Home</a></li><li><a href="/index.html">Config Ref. Home</a></li><li><a href="http://wiki.apache.org/tomcat/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</a></li></ul></div><div><h2>Top Level Elements</h2><ul><li><a href="/server.html">Server</a></li><li><a href="/service.html">Service</a></li></ul></div><div><h2>Executors</h2><ul><li><a href="/executor.html">Executor</a></li></ul></div><div><h2>Connectors</h2><ul><li><a href="/http.html">HTTP/1.1</a></li><li><a href="/http2.html">HTTP/2</a></li><li><a href="/ajp.html">AJP</a></li></ul></div><div><h2>Containers</h2><ul><li><a href="/context.html">Context</a></li><li><a href="/engine.html">Engine</a></li><li><a href="/host.html">Host</a></li><li><a href="/cluster.html">Cluster</a></li></ul></div><div><h2>Nested Components</h2><ul><li><a href="/cookie-processor.html">CookieProcessor</a></li><li><a href="/credentialhandler.html">CredentialHandler</a></li><li><a href="/globalresources.html">Global Resources</a></li><li><a href="/jar-scanner.html">JarScanner</a></li><li><a href="/jar-scan-filter.html">JarScanFilter</a></li><li><a href="/listeners.html">Listeners</a></li><li><a href="/loader.html">Loader</a></li><li><a href="/manager.html">Manager</a></li><li><a href="/realm.html">Realm</a></li><li><a href="/resources.html">Resources</a></li><li><a href="/sessionidgenerator.html">SessionIdGenerator</a></li><li><a href="/valve.html">Valve</a></li></ul></div><div><h2>Cluster Elements</h2><ul><li><a href="/cluster.html">Cluster</a></li><li><a href="/cluster-manager.html">Manager</a></li><li><a href="/cluster-channel.html">Channel</a></li><li><a href="/cluster-membership.html">Channel/Membership</a></li><li><a href="/cluster-sender.html">Channel/Sender</a></li><li><a href="/cluster-receiver.html">Channel/Receiver</a></li><li><a href="/cluster-interceptor.html">Channel/Interceptor</a></li><li><a href="/cluster-valve.html">Valve</a></li><li><a href="/cluster-deployer.html">Deployer</a></li><li><a href="/cluster-listener.html">ClusterListener</a></li></ul></div><div><h2>web.xml</h2><ul><li><a href="/filter.html">Filter</a></li></ul></div><div><h2>Other</h2><ul><li><a href="/systemprops.html">System properties</a></li><li><a href="/jaspic.html">JASPIC</a></li></ul></div></nav></div></div><div id="mainRight"><div id="content"><h2>Overview</h2><h3 id="Overview">Overview</h3><div class="text">
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<p>This manual contains reference information about all of the configuration
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directives that can be included in a <code>conf/server.xml</code> file to
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configure the behavior of the Tomcat Servlet/JSP container.  It does not
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attempt to describe which configuration directives should be used to perform
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specific tasks - for that, see the various <em>HOW-TO</em> documents on the
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main index page.</p>
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<p>Tomcat configuration files are formatted as schemaless XML; elements and
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attributes are case-sensitive. Apache Ant-style variable substitution
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is supported; a system property with the name <code>propname</code> may be
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used in a configuration file using the syntax <code>${propname}</code>. All
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system properties are available including those set using the <code>-D</code>
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syntax, those automatically made available by the JVM and those configured in
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the <code>$CATALINA_BASE/conf/catalina.properties</code> file.
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</p>
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<p>The configuration element descriptions are organized into the following
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major categories:</p>
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<ul>
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<li><strong>Top Level Elements</strong> - <code><Server></code> is the
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    root element of the entire configuration file, while
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    <code><Service></code> represents a group of Connectors that is
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    associated with an Engine.</li>
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<li><strong>Connectors</strong> - Represent the interface between external
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    clients sending requests to (and receiving responses from) a particular
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    Service.</li>
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<li><strong>Containers</strong> - Represent components whose function is to
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    process incoming requests, and create the corresponding responses.
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    An Engine handles all requests for a Service, a Host handles all requests
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    for a particular virtual host, and a Context handles all requests for a
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    specific web application.</li>
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<li><strong>Nested Components</strong> - Represent elements that can be
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    nested inside the element for a Container.  Some elements can be nested
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    inside any Container, while others can only be nested inside a
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    Context.</li>
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</ul>
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<p>For each element, the corresponding documentation follows this general
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outline:</p>
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<ul>
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<li><strong>Introduction</strong> - Overall description of this particular
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    component.  There will be a corresponding Java <em>interface</em> (in
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    the <code>org.apache.catalina</code> package) that is implemented by one
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    or more standard implementations.</li>
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<li><strong>Attributes</strong> - The set of attributes that are legal for
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    this element.  Generally, this will be subdivided into <em>Common</em>
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    attributes that are supported by all implementations of the corresponding
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    Java interface, and <em>Standard Implementation</em> attributes that are
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    specific to a particular Java class that implements this interface.
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    The names of required attributes are <strong>bolded</strong>.</li>
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<li><strong>Nested Components</strong> - Enumerates which of the <em>Nested
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    Components</em> can be legally nested within this element.</li>
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<li><strong>Special Features</strong> - Describes the configuration of a large
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    variety of special features (specific to each element type) that are
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    supported by the standard implementation of this interface.</li>
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</ul>
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</div><div class="noprint"><h3 id="comments_section">
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                  Comments
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                </h3><div class="text"><p class="notice"><strong>Notice: </strong>This comments section collects your suggestions
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                    <a href="http://tomcat.apache.org/lists.html">mailing list</a>.
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                    Do not ask such questions here. This is not a Q&A section.<br/><br/>
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