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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat 7 Architecture (7.0.69) - Request Process Flow</title><meta name="author" content="Yoav Shapira"><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"><tr><td><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 7</font></h1><font face="arial,helvetica,sanserif">Version 7.0.69, Apr 11 2016</font></td><td><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"><tr><td colspan="2"><hr noshade size="1"></td></tr><tr><td width="20%" valign="top" nowrap class="noPrint"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Architecture Home</a></li><li><a href="http://wiki.apache.org/tomcat/FAQ">FAQ</a></li><li><a href="#comments_section">User Comments</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><td width="80%" valign="top" align="left" id="mainBody"><h1>Request Process Flow</h1><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Request Process Flow"></a><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 border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="description"><strong>description</strong></a></font></td></tr><tr><td><blockquote>
<p>
TODO
</p>
</blockquote></td></tr></table>

<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="diagrams"><strong>diagrams</strong></a></font></td></tr><tr><td><blockquote>
<p>
A UML sequence diagram of the request process is available
<a href="requestProcess/request-process.png">here.</a>
</p>
<p>
A UML sequence diagram of the authentication process is available
<a href="requestProcess/authentication-process.png">here.</a>
</p>

</blockquote></td></tr></table>

<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><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 modifying (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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