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            Version: 9.3.28.v20191105</span></td><td style="width: 50%"></td></tr></table><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Proxy Servlet</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="advanced-extras.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a>&nbsp;</td><th width="60%" align="center">Chapter&nbsp;18.&nbsp;Provided Servlets, Filters, and Handlers<br><a accesskey="p" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></th><td width="20%" align="right">&nbsp;<a accesskey="n" href="balancer-servlet.html">Next <i class="fa fa-chevron-right" aria-hidden="true"></i></a></td></tr></table><hr></div><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="jetty-callout"><h5 class="callout"><a href="http://www.webtide.com/">Contact the core Jetty developers at
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      </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="proxy-servlet"></a>Proxy Servlet</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="proxy-servlet.html#proxy-servlet-metadata">Info</a></span></dt><dt><span class="section"><a href="proxy-servlet.html#proxy-servlet-usage">Usage</a></span></dt><dt><span class="section"><a href="proxy-servlet.html#proxy-servlet-init">Init Parameters</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="proxy-servlet-metadata"></a>Info</h3></div></div></div><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">Classname: <code class="literal">org.eclipse.jetty.proxy.ProxyServlet</code></li><li class="listitem">Maven Artifact: org.eclipse.jetty:jetty-proxy</li><li class="listitem">Javadoc: <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/proxy/ProxyServlet.html" target="_top">http://www.eclipse.org/jetty/javadoc/9.3.28.v20191105/org/eclipse/jetty/proxy/ProxyServlet.html</a></li></ul></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="proxy-servlet-usage"></a>Usage</h3></div></div></div><p>An asynchronous servlet that forwards requests to another server either as a standard web reverse proxy (as defined by RFC2616) or as a transparent reverse proxy.
Internally it uses the async jetty-client.</p><p>To facilitate JMX monitoring, the <code class="literal">HttpClient</code> instance is set as context attribute, prefixed with the servlet&#8217;s name and exposed by the mechanism provided by <code class="literal">ContextHandler.MANAGED_ATTRIBUTES</code>.</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="proxy-servlet-init"></a>Init Parameters</h3></div></div></div><p>The following init parameters may be used to configure the servlet:</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">hostHeader</span></dt><dd>forces the host header to a particular value</dd><dt><span class="term">viaHost</span></dt><dd>the name to use in the Via header: Via: http/1.1 &lt;viaHost&gt;</dd><dt><span class="term">whiteList</span></dt><dd>comma-separated list of allowed proxy hosts</dd><dt><span class="term">blackList</span></dt><dd>comma-separated list of forbidden proxy hosts</dd></dl></div><p>In addition, there are a number of init parameters that can be used to configure the <code class="literal">HttpClient</code> instance used internally for the proxy.</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">maxThreads</span></dt><dd>Default Value: 256
The max number of threads of HttpClient&#8217;s Executor</dd><dt><span class="term">maxConnections</span></dt><dd>Default Value: 32768
The max number of connections per destination.
RFC 2616 suggests that 2 connections should be opened per each destination, but browsers commonly open 6 or more.
If this <code class="literal">HttpClient</code> is used for load testing, it is common to have only one destination (the server to load test), and it is recommended to set this value to a high value (at least as much as the threads present in the executor).</dd><dt><span class="term">idleTimeout</span></dt><dd>Default Value: 30000
The idle timeout in milliseconds that a connection can be idle, that is without traffic of bytes in either direction.</dd><dt><span class="term">timeout</span></dt><dd>Default Value: 60000
The total timeout in milliseconds for the request/response conversation.</dd><dt><span class="term">requestBufferSize</span></dt><dd>Default Value: 4096
The size of the request buffer the request is written into.</dd><dt><span class="term">responseBufferSize</span></dt><dd>Default Value: 4096
The size of the response buffer the response is written into.</dd></dl></div></div></div><script type="text/javascript">
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