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+<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Catalina Functional Specifications (6.0.39) - Default Servlet</title><meta name="author" content="Craig McClanahan"><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"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="../images/tomcat.gif" align="right" alt="

+      Catalina Functional Specifications

+    " border="0"></a></td><td><h1><font face="arial,helvetica,sanserif">Apache Tomcat 6.0</font></h1><font face="arial,helvetica,sanserif">Version 6.0.39, Jan 27 2014</font></td><td><!--APACHE LOGO--><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"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><tr><!--LEFT SIDE NAVIGATION--><td width="20%" valign="top" nowrap="nowrap" class="noPrint"><p><strong>Links</strong></p><ul><li><a href="../index.html">Docs Home</a></li><li><a href="index.html">Functional Specs</a></li></ul><p><strong>Administrative Apps</strong></p><ul><li><a href="fs-admin-apps.html">Overall Requirements</a></li><li><a href="mbean-names.html">Tomcat MBean Names</a></li><li><a href="fs-admin-objects.html">Administered Objects</a></li><li><a href="fs-admin-opers.html">Supported Operations</a></li></ul><p><strong>Internal Servlets</strong></p><ul><li><a href="fs-default.html">Default Servlet</a></li><li><a href="fs-invoker.html">Invoker Servlet</a></li></ul><p><strong>Realm Implementations</strong></p><ul><li><a href="fs-jdbc-realm.html">JDBC Realm</a></li><li><a href="fs-jndi-realm.html">JNDI Realm</a></li><li><a href="fs-memory-realm.html">Memory Realm</a></li></ul></td><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left" id="mainBody"><h1>Catalina Functional Specifications</h1><h2>Default Servlet</h2><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><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="#Overview">Overview</a><ol><li><a href="#Introduction">Introduction</a></li><li><a href="#External_Specifications">External Specifications</a></li><li><a href="#Implementation_Requirements">Implementation Requirements</a></li></ol></li><li><a href="#Dependencies">Dependencies</a><ol><li><a href="#Environmental_Dependencies">Environmental Dependencies</a></li><li><a href="#Container_Dependencies">Container Dependencies</a></li></ol></li><li><a href="#Functionality">Functionality</a><ol><li><a href="#Initialization_Functionality">Initialization Functionality</a></li><li><a href="#Per-Request_Functionality">Per-Request Functionality</a></li><li><a href="#Finalization_Functionality">Finalization Functionality</a></li></ol></li><li><a href="#Testable_Assertions">Testable Assertions</a></li></ul>

+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Overview"><strong>Overview</strong></a></font></td></tr><tr><td><blockquote>

+

+

+  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>

+

+    <p>The purpose of the <strong>Default Servlet</strong> is to serve

+    static resources of a web application in response to client requests.

+    As the name implies, it is generally configured as the "default"

+    servlet for a web application, by being mapped to a URL pattern "/".</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="External Specifications"><!--()--></a><a name="External_Specifications"><strong>External Specifications</strong></a></font></td></tr><tr><td><blockquote>

+

+    <p>The following external specifications have provisions which

+    partially define the correct behavior of the default servlet:</p>

+    <ul>

+    <li><a href="http://java.sun.com/products/servlet/download.html">

+        Servlet Specification</a> (Version 2.3 PFD2)</li>

+    <li><a href="http://www.rfc-editor.org/rfc/rfc2046.txt">Multipurpose

+        Internet Mail Extensions (MIME) Part Two: Media Types</a></li>

+    <li><a href="http://www.rfc-editor.org/rfc/rfc2616.txt">Hypertext

+        Transfer Protocol -- HTTP/1.1</a></li>

+    </ul>

+

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

+

+

+  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Implementation Requirements"><!--()--></a><a name="Implementation_Requirements"><strong>Implementation Requirements</strong></a></font></td></tr><tr><td><blockquote>

+

+    <p>The implementation of this functionality shall conform to the

+    following requirements:</p>

+    <ul>

+    <li>Must be implemented as a servlet.</li>

+    <li>Must support configurable parameters for debugging detail level,

+        input buffer size, output buffer size, whether or not to produce

+        directory listings when no welcome file is present, and whether or not

+        modifications are supported via DELETE and PUT.</li>

+    <li>Log debugging and operational messages (suitably internationalized)

+        via the <code>getServletContext().log()</code> method.</li>

+    </ul>

+

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

+

+

+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Dependencies"><strong>Dependencies</strong></a></font></td></tr><tr><td><blockquote>

+

+

+  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Environmental Dependencies"><!--()--></a><a name="Environmental_Dependencies"><strong>Environmental Dependencies</strong></a></font></td></tr><tr><td><blockquote>

+

+    <p>The following environmental dependencies must be met in order for

+    the default servlet to operate correctly:</p>

+    <ul>

+    <li>The default servlet must be registered in the application deployment

+        descriptor (or the default deployment descriptor in file

+        <code>$CATALINA_BASE/conf/web.xml</code>) using a "default servlet"

+        servlet mapping, signified by URL pattern "/".</li>

+    </ul>

+

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

+

+

+  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Container Dependencies"><!--()--></a><a name="Container_Dependencies"><strong>Container Dependencies</strong></a></font></td></tr><tr><td><blockquote>

+

+    <p>Correct operation of the default servlet depends on the following

+    specific features of the surrounding container:</p>

+    <ul>

+    <li>The container shall provide a servlet context attribute that

+        lists the welcome file names that have been defined for this

+        web application.</li>

+    <li>The container shall provide a servlet context attribute that

+        contains a <code>javax.naming.directory.DirContext</code>

+        implementation representing the static resources of this

+        web application.</li>

+    </ul>

+

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

+

+

+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Functionality"><strong>Functionality</strong></a></font></td></tr><tr><td><blockquote>

+

+

+  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Initialization Functionality"><!--()--></a><a name="Initialization_Functionality"><strong>Initialization Functionality</strong></a></font></td></tr><tr><td><blockquote>

+

+    <p>The following processing must be performed when the <code>init()</code>

+    method of the default servlet is called:</p>

+    <ul>

+    <li>Process and sanity check configuration parameters.</li>

+    </ul>

+

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

+

+

+  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Per-Request Functionality"><!--()--></a><a name="Per-Request_Functionality"><strong>Per-Request Functionality</strong></a></font></td></tr><tr><td><blockquote>

+

+

+    <p>For all HTTP request methods, the resource path is determined from

+    the path information provided to this request, either as request attribute

+    <code>javax.servlet.include.path_info</code> (for a request dispatcher

+    access to a static resource) or by calling

+    <code>request.getPathInfo()</code> directly.</p>

+

+    <p>On each HTTP DELETE request processed by this servlet, the following

+    processing shall be performed:</p>

+    <ul>

+    <li>If modifications to the static resources are not allowed (set by a

+        configuration parameter), return HTTP status 403 (forbidden).</li>

+    <li>If an attempt is made to delete a resource from <code>/META-INF</code>

+        or <code>/WEB-INF</code>, return HTTP status 403 (forbidden).</li>

+    <li>If the requested resource does not exist, return HTTP status 404

+        (not found)</li>

+    <li>Unbind the resource from the directory context containing the

+        static resources for this web application.  If successful, return

+        HTTP status 204 (no content).  Otherwise, return HTTP status 405

+        (method not allowed).</li>

+    </ul>

+

+

+    <p>On each HTTP GET request processed by this servlet, the following

+    processing shall be performed:</p>

+    <ul>

+    <li>If the request is for a resource under <code>/META-INF</code> or

+        <code>/WEB-INF</code>, return HTTP status 404 (not found).</li>

+    <li>If the requested resource does not exist, return HTTP status 404

+        (not found).</li>

+    <li>If the requested resource is not a directory, but the resource

+        path ends in "/" or "\", return HTTP status 404 (not found).</li>

+    <li>If the requested resource is a directory:

+        <ul>

+        <li>If the request path does not end with "/", redirect to a

+            corresponding path with "/" appended so that relative references

+            in welcome files are resolved correctly.</li>

+        <li>If one of the specified welcome files exists, redirect to the

+            path for that welcome file so that it will be served explicitly.

+            </li>

+        </ul></li>

+    <li>If the request being processed contains an <code>If-Range</code>

+        header, perform the processing described in the HTTP/1.1 specification

+        to determine whether the client's information is up to date.</li>

+    <li>Determine the content type of the response, by looking up the

+        corresponding MIME type in our servlet context.</li>

+    <li>If the requested resource is a directory:

+        <ul>

+        <li>If directory listings are suppressed, return HTTP status 404

+            (not found).</li>

+        <li>Set the content type to <code>text/html</code>.</li>

+        </ul></li>

+    <li>Determine the range(s) to be returned, based on the existence of

+        any <code>If-Range</code> and <code>Range</code> headers.</li>

+    <li>If the requested resource is a directory, include an <code>ETag</code>

+        header in the response, with the value calculated based on the content

+        of the directory.</li>

+    <li>Include a <code>Last-Modified</code> header in the response documenting

+        the date/time that the resource was last modified.</li>

+    <li>Unless we are processing a HEAD request, include the appropriate

+        content (or content ranges) in the response.</li>

+    </ul>

+

+    <p>On each HTTP HEAD request processed by this servlet, the following

+    processing shall be performed:</p>

+    <ul>

+    <li>Processed identically to an HTTP GET request, except that the data

+        content is not transmitted after the headers.</li>

+    </ul>

+

+    <p>On each HTTP POST request processed by this servlet, the following

+    processing shall be performed:</p>

+    <ul>

+    <li>Processed identically to an HTTP GET request.</li>

+    </ul>

+

+

+    <p>On each HTTP PUT request processed by this servlet, the following

+    processing shall be performed:</p>

+    <ul>

+    <li>If modifications to the static resources are not allowed (set by a

+        configuration parameter), return HTTP status 403 (forbidden).</li>

+    <li>If an attempt is made to delete a resource from <code>/META-INF</code>

+        or <code>/WEB-INF</code>, return HTTP status 403 (forbidden).</li>

+    <li>Create a new resource from the body of this request.</li>

+    <li>Bind or rebind the specified path to the new resource (depending on

+        whether it currently exists or not).  Return HTTP status as follows:

+        <ul>

+        <li>If binding was unsuccessful, return HTTP status 409 (conflict).

+            </li>

+        <li>If binding was successful and the resource did not previously

+            exist, return HTTP status 201 (created).</li>

+        <li>If binding was successful and the resource previously existed,

+            return HTTP status 204 (no content).</li>

+        </ul></li>

+    </ul>

+

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

+

+

+  <table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Finalization Functionality"><!--()--></a><a name="Finalization_Functionality"><strong>Finalization Functionality</strong></a></font></td></tr><tr><td><blockquote>

+

+    <p>No specific processing is required when the <code>destroy()</code>

+    method is called:</p>

+

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

+

+

+</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Testable Assertions"><!--()--></a><a name="Testable_Assertions"><strong>Testable Assertions</strong></a></font></td></tr><tr><td><blockquote>

+

+  <p>In addition the the assertions implied by the functionality requirements

+  listed above, the following additional assertions shall be tested to

+  validate the behavior of the default servlet:</p>

+  <ul>

+  <li>Requests for resources that do not exist in the web application must

+      return HTTP status 404 (not found).</li>

+  <li>The default servlet must operate identically for web applications that

+      are run out of a WAR file directly, or from an unpacked directory

+      structure.</li>

+  <li>If the web application is running out of an unpacked directory

+      structure, the default servlet must recognize cases where the resource

+      has been updated through external means.</li>

+  </ul>

+

+</blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>

+        Copyright &copy; 1999-2014, Apache Software Foundation

+        </em></font></div></td></tr></table></body></html>
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