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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>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="4" width="100%" border="0"><!--PAGE HEADER--><tr><td colspan="2"><!--JAKARTA LOGO--><a href="http://jakarta.apache.org/"><img border="0" alt="The Jakarta Project" align="left" src="../../images/jakarta-logo.gif"></a><!--PROJECT LOGO--><a href="http://jakarta.apache.org/tomcat/"><img border="0" alt="
The Tomcat Servlet/JSP Container
" align="right" src="../../images/tomcat.gif"></a></td></tr><!--HEADER SEPARATOR--><tr><td colspan="2"><hr size="1" noshade="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>Tomcat Architecture</h1><h2>Request Process Flow</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="Request Process Flow"><strong>Request Process Flow</strong></a></font></td></tr><tr><td><blockquote>
<p>
This page describes the process used by Tomcat to handle
an incoming request. This process is largely defined by
the Servlet Specification, which outlines the order
of events that must take place.
</p>
<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>
<p>
TODO
</p>
</blockquote></td></tr></table>
<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>
<p>
A UML sequence diagram of the request process is available
<a href="../requestProcess/requestProcess.pdf">here.</a>
</p>
</blockquote></td></tr></table>
<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>
<p>
The Servlet Specification provides many opportunities for
listening in (using Listeners) or modiying (using Filters)
the request handling process even before the request arrives
at the servlet that will handle it.
</p>
</blockquote></td></tr></table>
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