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+<html><head><META http-equiv="Content-Type" content="text/html;
charset=iso-8859-1"><title>Apache Tomcat 6.0 - Proxy Support
HOW-TO</title><meta content="Craig R. McClanahan" name="author"><style
media="print" type="text/css">
+ .noPrint {display: none;}
+ td#mainBody {width: 100%;}
+ </style></head><body vlink="#525D76" alink="#525D76"
link="#525D76" text="#000000" bgcolor="#ffffff"><table cellspacing="0"
width="100%" border="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a
href="http://tomcat.apache.org/";><img border="0" alt="
+ The Apache Tomcat Servlet/JSP Container
+ " align="right" src="./images/tomcat.gif"></a></td><td><h1><font
face="arial,helvetica,sanserif">Apache Tomcat
6.0</font></h1></td><td><!--APACHE LOGO--><a href="http://www.apache.org/";><img
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MAIN BODY--><td id="mainBody" align="left" valign="top" width="80%"><h1>Apache
Tomcat 6.0</h1>
<h2>Proxy Support HOW-TO</h2><table cellpadding="2" cellspacing="0"
border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif"
color="#ffffff"><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 cellpadding="2" cellspacing="0"
border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif"
color="#ffffff"><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/coyote.html">Coyote 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><Connector></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 cellpadding="2" cellspacing="0"
border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif"
color="#ffffff"><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 border="0" cellpadding="0" cellspacing="4"><tr><td
height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0"
height="1" width="1" alt="" src="./images/void.gif"></td><td height="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td></tr><tr><td width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre>
+LoadModule proxy_module {path-to-modules}/mod_proxy.so
+AddModule mod_proxy.c
+</pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0"
vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></td></tr><tr><td height="1" width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" bgcolor="#023264"><img
border="0" hspace="0" vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img
border="0" hspace="0" vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></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 border="0" cellpadding="0" cellspacing="4"><tr><td
height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0"
height="1" width="1" alt="" src="./images/void.gif"></td><td height="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td></tr><tr><td width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre>
+ProxyPass /myapp http://localhost:8081/myapp
+ProxyPassReverse /myapp http://localhost:8081/myapp
+</pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0"
vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></td></tr><tr><td height="1" width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" bgcolor="#023264"><img
border="0" hspace="0" vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img
border="0" hspace="0" vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></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><Connector></code> element, with appropriate
+ proxy settings, for example:
+<div align="left"><table border="0" cellpadding="0" cellspacing="4"><tr><td
height="1" width="1" bgcolor="#023264"><img border="0" hspace="0" vspace="0"
height="1" width="1" alt="" src="./images/void.gif"></td><td height="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td></tr><tr><td width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" bgcolor="#ffffff"><pre>
+<Connector port="8081" ...
+ proxyName="www.mycompany.com"
+ proxyPort="80"/>
+</pre></td><td width="1" bgcolor="#023264"><img border="0" hspace="0"
vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></td></tr><tr><td height="1" width="1"
bgcolor="#023264"><img border="0" hspace="0" vspace="0" height="1" width="1"
alt="" src="./images/void.gif"></td><td height="1" bgcolor="#023264"><img
border="0" hspace="0" vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></td><td height="1" width="1" bgcolor="#023264"><img
border="0" hspace="0" vspace="0" height="1" width="1" alt=""
src="./images/void.gif"></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><Connector></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><Connector></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><Service></code> that contains
+ only a <code><Connector></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 cellpadding="2" cellspacing="0"
border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif"
color="#ffffff"><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 size="1" noshade></td></tr><!--PAGE FOOTER--><tr><td
colspan="2"><div align="center"><font size="-1" color="#525D76"><em>
+ Copyright © 1999-2010, Apache Software Foundation
+ </em></font></div></td></tr></table></body></html>
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