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1<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Architecture - Request Process Flow</title><meta value="Yoav Shapira" name="author"><meta value="yoavs@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><!--LEFT SIDE NAVIGATION--><td nowrap="true" valign="top" width="20%"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li></ul><p><strong>Contents</strong></p><ul><li><a href="index.html">Contents</a></li><li><a href="overview.html">Overview</a></li><li><a href="startup.html">Server Startup</a></li><li><a href="requestProcess.html">Request Process</a></li></ul></td><!--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 Architecture</h1><h2>Request Process Flow</h2></td><td nowrap="true" valign="top" align="right"><small><a href="printer/requestProcess.html"><img alt="Printer Friendly Version" border="0" src="../images/printer.gif"><br>print-friendly<br>version
4                    </a></small></td></tr></table><table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#525D76"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="Request Process Flow"><strong>Request Process Flow</strong></a></font></td></tr><tr><td><blockquote>
5
6<p>
7This page describes the process used by Tomcat to handle
8an incoming request.  This process is largely defined by
9the Servlet Specification, which outlines the order
10of events that must take place.
11</p>
12
13<table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="description"><strong>description</strong></a></font></td></tr><tr><td><blockquote>
14<p>
15TODO
16</p>
17</blockquote></td></tr></table>
18
19<table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="diagram"><strong>diagram</strong></a></font></td></tr><tr><td><blockquote>
20<p>
21A UML sequence diagram of the request process is available
22<a href="requestProcess/requestProcess.pdf">here.</a>
23</p>
24</blockquote></td></tr></table>
25
26<table cellpadding="2" cellspacing="0" border="0"><tr><td bgcolor="#828DA6"><font face="arial,helvetica.sanserif" color="#ffffff"><a name="comments"><strong>comments</strong></a></font></td></tr><tr><td><blockquote>
27<p>
28The Servlet Specification provides many opportunities for
29listening in (using Listeners) or modiying (using Filters)
30the request handling process even before the request arrives
31at the servlet that will handle it.
32</p>
33
34</blockquote></td></tr></table>
35
36</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>
37        Copyright &copy; 1999-2008, Apache Software Foundation
38        </em></font></div></td></tr></table></body></html>
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