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+<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 6.0 (6.0.39) - Proxy Support HOW-TO</title><meta name="author" content="Craig R. McClanahan"><style type="text/css" media="print">

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+		</style></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="./images/tomcat.gif" align="right" alt="

+      The Apache Tomcat Servlet/JSP Container

+    " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 6.0</font></h1><font face="arial,helvetica,sanserif">Version 6.0.39, Jan 27 2014</font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="./images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap="nowrap" class="noPrint"><p><strong>Links</strong></p><ul><li><a href="index.html">Docs Home</a></li><li><a href="http://wiki.apache.org/tomcat/FAQ">FAQ</a></li></ul><p><strong>User Guide</strong></p><ul><li><a href="introduction.html">1) Introduction</a></li><li><a href="setup.html">2) Setup</a></li><li><a href="appdev/index.html">3) First webapp</a></li><li><a href="deployer-howto.html">4) Deployer</a></li><li><a href="manager-howto.html">5) Manager</a></li><li><a href="realm-howto.html">6) Realms and AAA</a></li><li><a href="security-manager-howto.html">7) Security Manager</a></li><li><a href="jndi-resources-howto.html">8) JNDI Resources</a></li><li><a href="jndi-datasource-examples-howto.html">9) JDBC DataSources</a></li><li><a href="class-loader-howto.html">10) Classloading</a></li><li><a href="jasper-howto.html">11) JSPs</a></li><li><a href="ssl-howto.html">12) SSL</a></li><li><a href="ssi-howto.html">13) SSI</a></li><li><a href="cgi-howto.html">14) CGI</a></li><li><a href="proxy-howto.html">15) Proxy Support</a></li><li><a href="mbeans-descriptor-howto.html">16) MBean Descriptor</a></li><li><a href="default-servlet.html">17) Default Servlet</a></li><li><a href="cluster-howto.html">18) Clustering</a></li><li><a href="balancer-howto.html">19) Load Balancer</a></li><li><a href="connectors.html">20) Connectors</a></li><li><a href="monitoring.html">21) Monitoring and Management</a></li><li><a href="logging.html">22) Logging</a></li><li><a href="apr.html">23) APR/Native</a></li><li><a href="virtual-hosting-howto.html">24) Virtual Hosting</a></li><li><a href="aio.html">25) Advanced IO</a></li><li><a href="extras.html">26) Additional Components</a></li><li><a href="maven-jars.html">27) Mavenized</a></li></ul><p><strong>Reference</strong></p><ul><li><a href="RELEASE-NOTES.txt">Release Notes</a></li><li><a href="config/index.html">Configuration</a></li><li><a href="api/index.html">Javadocs</a></li><li><a href="http://tomcat.apache.org/connectors-doc/">JK 1.2 Documentation</a></li></ul><p><strong>Apache Tomcat Development</strong></p><ul><li><a href="building.html">Building</a></li><li><a href="changelog.html">Changelog</a></li><li><a href="http://wiki.apache.org/tomcat/TomcatVersions">Status</a></li><li><a href="developers.html">Developers</a></li><li><a href="architecture/index.html">Architecture</a></li><li><a href="funcspecs/index.html">Functional Specs.</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left" id="mainBody"><h1>Apache Tomcat 6.0</h1><h2>Proxy Support HOW-TO</h2><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Table of Contents"><!--()--></a><a name="Table_of_Contents"><strong>Table of Contents</strong></a></font></td></tr><tr><td><blockquote>

+<ul><li><a href="#Introduction">Introduction</a></li><li><a href="#Apache_1.3_Proxy_Support">Apache 1.3 Proxy Support</a></li><li><a href="#Apache_2.0_Proxy_Support">Apache 2.0 Proxy Support</a></li></ul>

+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>

+

+<p>Using standard configurations of Tomcat, web applications can ask for

+the server name and port number to which the request was directed for

+processing.  When Tomcat is running standalone with the

+<a href="config/http.html">HTTP/1.1 Connector</a>, it will generally

+report the server name specified in the request, and the port number on

+which the <strong>Connector</strong> is listening.  The servlet API

+calls of interest, for this purpose, are:</p>

+<ul>

+<li><code>ServletRequest.getServerName()</code>: Returns the host name of the server to which the request was sent.</li>

+<li><code>ServletRequest.getServerPort()</code>: Returns the host name of the server to which the request was sent.</li>

+<li><code>ServletRequest.getLocalName()</code>: Returns the host name of the Internet Protocol (IP) interface on which the request was received.</li>

+<li><code>ServletRequest.getLocalPort()</code>:  Returns the Internet Protocol (IP) port number of the interface on which the request was received.</li>

+</ul>

+

+<p>When you are running behind a proxy server (or a web server that is

+configured to behave like a proxy server), you will sometimes prefer to

+manage the values returned by these calls.  In particular, you will

+generally want the port number to reflect that specified in the original

+request, not the one on which the <strong>Connector</strong> itself is

+listening.  You can use the <code>proxyName</code> and <code>proxyPort</code>

+attributes on the <code>&lt;Connector&gt;</code> element to configure

+these values.</p>

+

+<p>Proxy support can take many forms.  The following sections describe

+proxy configurations for several common cases.</p>

+

+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Apache 1.3 Proxy Support"><!--()--></a><a name="Apache_1.3_Proxy_Support"><strong>Apache 1.3 Proxy Support</strong></a></font></td></tr><tr><td><blockquote>

+

+<p>Apache 1.3 supports an optional module (<code>mod_proxy</code>) that

+configures the web server to act as a proxy server.  This can be used to

+forward requests for a particular web application to a Tomcat 6 instance,

+without having to configure a web connector such as <code>mod_jk</code>.

+To accomplish this, you need to perform the following tasks:</p>

+<ol>

+<li>Configure your copy of Apache so that it includes the

+    <code>mod_proxy</code> module.  If you are building from source,

+    the easiest way to do this is to include the

+    <code>--enable-module=proxy</code> directive on the

+    <code>./configure</code> command line.</li>

+<li>If not already added for you, make sure that you are loading the

+    <code>mod_proxy</code> module at Apache startup time, by using the

+    following directives in your <code>httpd.conf</code> file:

+<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>

+LoadModule proxy_module  {path-to-modules}/mod_proxy.so

+AddModule  mod_proxy.c

+</pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div></li>

+<li>Include two directives in your <code>httpd.conf</code> file for

+    each web application that you wish to forward to Tomcat 6.  For

+    example, to forward an application at context path <code>/myapp</code>:

+<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>

+ProxyPass         /myapp  http://localhost:8081/myapp

+ProxyPassReverse  /myapp  http://localhost:8081/myapp

+</pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>

+    which tells Apache to forward URLs of the form

+    <code>http://localhost/myapp/*</code> to the Tomcat 6 connector

+    listening on port 8081.</li>

+<li>Configure your copy of Tomcat 6 to include a special

+    <code>&lt;Connector&gt;</code> element, with appropriate

+    proxy settings, for example:

+<div align="left"><table cellspacing="4" cellpadding="0" border="0"><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#ffffff" height="1"><pre>

+&lt;Connector port="8081" ...

+              proxyName="www.mycompany.com"

+              proxyPort="80"/&gt;

+</pre></td><td bgcolor="#023264" width="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr><tr><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td><td bgcolor="#023264" width="1" height="1"><img src="./images/void.gif" alt="" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table></div>

+    which will cause servlets inside this web application to think that

+    all proxied requests were directed to <code>www.mycompany.com</code>

+    on port 80.</li>

+<li>It is legal to omit the <code>proxyName</code> attribute from the

+    <code>&lt;Connector&gt;</code> element.  If you do so, the value

+    returned by <code>request.getServerName()</code> will by the host

+    name on which Tomcat is running.  In the example above, it would be

+    <code>localhost</code>.</li>

+<li>If you also have a <code>&lt;Connector&gt;</code> listening on port

+    8080 (nested within the same <a href="config/service.html">Service</a>

+    element), the requests to either port will share the same set of

+    virtual hosts and web applications.</li>

+<li>You might wish to use the IP filtering features of your operating

+    system to restrict connections to port 8081 (in this example) to

+    be allowed <strong>only</strong> from the server that is running

+    Apache.</li>

+<li>Alternatively, you can set up a series of web applications that are

+    only available via proxying, as follows:

+    <ul>

+    <li>Configure another <code>&lt;Service&gt;</code> that contains

+        only a <code>&lt;Connector&gt;</code> for the proxy port.</li>

+    <li>Configure appropriate <a href="config/engine.html">Engine</a>,

+        <a href="config/host.html">Host</a>, and

+        <a href="config/context.html">Context</a> elements for the virtual hosts

+        and web applications accessible via proxying.</li>

+    <li>Optionally, protect port 8081 with IP filters as described

+        earlier.</li>

+    </ul></li>

+<li>When requests are proxied by Apache, the web server will be recording

+    these requests in its access log.  Therefore, you will generally want to

+    disable any access logging performed by Tomcat itself.</li>

+</ol>

+

+<p>When requests are proxied in this manner, <strong>all</strong> requests

+for the configured web applications will be processed by Tomcat (including

+requests for static content).  You can improve performance by using the

+<code>mod_jk</code> web connector instead of <code>mod_proxy</code>. 

+<code>mod_jk</code> can be configured so that the web server serves static

+content that is not processed by filters or security constraints defined

+within the web application's deployment descriptor

+(<code>/WEB-INF/web.xml</code>).</p>

+

+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Apache 2.0 Proxy Support"><!--()--></a><a name="Apache_2.0_Proxy_Support"><strong>Apache 2.0 Proxy Support</strong></a></font></td></tr><tr><td><blockquote>

+The same instructions hold true as for 1.3. (Except in Apache 2.0,

+you may omit <code>AddModule  mod_proxy.c</code>)

+</blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>

+        Copyright &copy; 1999-2014, Apache Software Foundation

+        </em></font></div></td></tr></table></body></html>
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