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1<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 6.0 - CGI How To</title><meta value="Glenn L. Nielsen" name="author"><meta value="glenn@apache.org" name="email"></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="
2      The Apache Tomcat Servlet/JSP Container
3    " align="right" src="./../images/tomcat.gif"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img border="0" alt="Apache Logo" align="right" src="./../images/asf-logo.gif"></a></td></tr></table><table cellspacing="4" width="100%" border="0"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade></td></tr><tr><!--RIGHT SIDE MAIN BODY--><td align="left" valign="top" width="80%"><table cellspacing="4" width="100%" border="0"><tr><td valign="top" align="left"><h1>Apache Tomcat 6.0</h1><h2>CGI How To</h2></td><td nowrap="true" valign="top" align="right"><img border="0" hspace="0" vspace="0" height="1" width="1" src="./../images/void.gif"></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>
4
5<p>The CGI (Common Gateway Interface) defines a way for a web server to
6interact with external content-generating programs, which are often
7referred to as CGI programs or CGI scripts.
8</p>
9
10<p>Within Tomcat, CGI support can be added when you are using Tomcat as your
11HTTP server and require CGI support.  Typically this is done
12during development when you don't want to run a web server like
13Apache httpd.
14Tomcat's CGI support is largely compatible with Apache httpd's,
15but there are some limitations (e.g., only one cgi-bin directory).
16</p>
17
18<p>CGI support is implemented using the servlet class
19<code>org.apache.catalina.servlets.CGIServlet</code>.  Traditionally,
20this servlet is mapped to the URL pattern "/cgi-bin/*".</p>
21
22<p>By default CGI support is disabled in Tomcat.</p>
23</blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Installation"><strong>Installation</strong></a></font></td></tr><tr><td><blockquote>
24
25<p><strong>CAUTION</strong> - CGI scripts are used to execute programs
26external to the Tomcat JVM. If you are using the Java SecurityManager this
27will bypass your security policy configuration in <code>catalina.policy.</code></p>
28
29<p>Remove the XML comments from around the CGI servlet and servlet-mapping
30configuration in <code>$CATALINA_BASE/conf/web.xml</code>.</p>
31</blockquote></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Configuration"><strong>Configuration</strong></a></font></td></tr><tr><td><blockquote>
32
33<p>There are several servlet init parameters which can be used to
34configure the behaviour of the CGI servlet.
35<ul>
36<li><strong>cgiPathPrefix</strong> - The CGI search path will start at
37the web application root directory + File.separator + this prefix.
38The default cgiPathPrefix is <code>WEB-INF/cgi</code></li>
39<li><strong>debug</strong> - Debugging detail level for messages logged
40by this servlet. Default 0.</li>
41<li><strong>executable</strong> - The of the executable to be used to
42run the script. Default is <code>perl</code>.</li>
43<li><strong>parameterEncoding</strong> - Name of the parameter encoding
44to be used with the GCI servlet. Default is
45<code>System.getProperty("file.encoding","UTF-8")</code>.</li>
46<li><strong>passShellEnvironment</strong> - Should the shell environment
47variables (if any) be passed to the CGI script? Default is
48<code>false</code>.</li>
49</ul>
50</p>
51
52</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>
53        Copyright &copy; 1999-2008, Apache Software Foundation
54        </em></font></div></td></tr></table></body></html>
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