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          <code class="directive"><a href="./mod/core.html#require">Require</a></code> directive.</dd>

      <dt><code class="module"><a href="./mod/mod_authz_owner.html">mod_authz_owner</a></code></dt>
      <dd>A new module that authorizes access to files based
          on the owner of the file on the file system</dd>

      <dt><code class="module"><a href="./mod/mod_version.html">mod_version</a></code></dt>
      <dd>A new module that allows configuration blocks to be enabled based on the
          version number of the running server.</dd>

      <dt><code class="module"><a href="./mod/mod_info.html">mod_info</a></code></dt>
      <dd>Added a new <code>?config</code> argument which will show
          the configuration directives as parsed by Apache, including
          their file name and line number.  The module also 
          shows the order of all request hooks and additional
          build information, similar to <code>httpd -V</code>.</dd>

      <dt><code class="module"><a href="./mod/mod_ssl.html">mod_ssl</a></code></dt>
      
      <dd>Added a support for 
         <a href="http://www.ietf.org/rfc/rfc2817.txt">RFC 2817</a>, which 
         allows connections to upgrade from clear text to TLS encryption.</dd>

      <dt><code class="module"><a href="./mod/mod_imagemap.html">mod_imagemap</a></code></dt>
      <dd>mod_imap has been renamed to <code class="module"><a href="./mod/mod_imagemap.html">mod_imagemap</a></code> to avoid
          user confusion.</dd>
    </dl>

  </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="programs" id="programs">Program Enhancements</a></h2>
    
    <dl>
      <dt><code class="program"><a href="./programs/httpd.html">httpd</a></code></dt>
      <dd>A new command line option <code>-M</code> has been added that
      lists all modules that are loaded based on the current
      configuration. Unlike the <code>-l</code> option, this list
      includes DSOs loaded via <code class="module"><a href="./mod/mod_so.html">mod_so</a></code>.</dd>
      <dt><code class="program"><a href="./programs/httxt2dbm.html">httxt2dbm</a></code></dt>
      <dd>A new program used to generate dbm files from text input, 
          for use in <code class="directive"><a href="./mod/mod_rewrite.html#rewritemap">RewriteMap</a></code>
          with the <code>dbm</code> map type.</dd>
    </dl>
  </div><div class="top"><a href="#page-header"><img alt="top" src="./images/up.gif" /></a></div>
<div class="section">
<h2><a name="developer" id="developer">Module Developer Changes</a></h2>
    
    <dl>
      <dt><a class="glossarylink" href="./glossary.html#apr" title="see glossary">APR</a> 1.0 API</dt>

      <dd>Apache 2.2 uses the APR 1.0 API.  All deprecated functions and 
          symbols have been removed from <code>APR</code> and 
          <code>APR-Util</code>. For details, see the 
          <a href="http://apr.apache.org/">APR Website</a>.</dd>

      <dt>Authn/Authz</dt>
      <dd>The bundled authentication and authorization modules have
          been renamed along the following lines:
          <ul>
          <li>mod_auth_*  -&gt; Modules that implement an HTTP authentication mechanism</li>
          <li>mod_authn_* -&gt; Modules that provide a backend authentication provider</li>
          <li>mod_authz_* -&gt; Modules that implement authorization (or access)</li>
          <li>mod_authnz_*-&gt; Module that implements both authentication &amp; authorization</li>
          </ul>
          There is a new authentication backend provider
          scheme which greatly eases the construction of new authentication
          backends.</dd>

      <dt>Connection Error Logging</dt>

      <dd>A new function, <code>ap_log_cerror</code> has been added to log
          errors that occur with the client's connection.  When logged, 
          the message includes the client IP address.</dd>

      <dt>Test Configuration Hook Added</dt>

      <dd>A new hook, <code>test_config</code> has been added to aid
          modules that want to execute special code only when the user passes
          <code>-t</code> to <code class="program"><a href="./programs/httpd.html">httpd</a></code>.</dd>

      <dt>Set Threaded MPM's Stacksize</dt>

      <dd>A new directive, <code>ThreadStackSize</code> has been added to 
          set the stack size on all threaded MPMs.  This is required
          for some third-party modules on platforms with small default
          thread stack size.</dd>

      <dt>Protocol handling for output filters</dt>

      <dd>In the past, every filter has been responsible for ensuring 
          that it generates the correct response headers where it affects
          them.  Filters can now delegate common protocol management to
          <code class="module"><a href="./mod/mod_filter.html">mod_filter</a></code>, using the
          <code>ap_register_output_filter_protocol</code> or
          <code>ap_filter_protocol</code> calls.</dd>

      <dt>Monitor hook added</dt>
      <dd>Monitor hook enables modules to run regular/scheduled jobs
          in the parent (root) process.</dd>
          
      <dt>Regular expression API changes</dt>

      <dd>The <code>pcreposix.h</code> header is no longer available;
      it is replaced by the new <code>ap_regex.h</code> header.  The
      POSIX.2 <code>regex.h</code> implementation exposed by the old
      header is now available under the <code>ap_</code> namespace
      from <code>ap_regex.h</code>.  Calls to <code>regcomp</code>, 
      <code>regexec</code> and so on can be replaced by calls to
      <code>ap_regcomp</code>, <code>ap_regexec</code>.</dd>

      <dt>DBD Framework (SQL Database API)</dt>

      <dd><p>With Apache 1.x and 2.0, modules requiring an SQL backend
      had to take responsibility for managing it themselves.  Apart
      from reinventing the wheel, this can be very inefficient, for
      example when several modules each maintain their own connections.</p>
      <p>Apache 2.1 and later provides the <code>ap_dbd</code> API for
      managing database connections (including optimised strategies
      for threaded and unthreaded MPMs), while APR 1.2 and later provides
      the <code>apr_dbd</code> API for interacting with the database.</p>
      <p>New modules SHOULD now use these APIs for all SQL database
      operations.  Existing applications SHOULD be upgraded to use it
      where feasible, either transparently or as a recommended option
      to their users.</p></dd>
    </dl>
  </div></div>
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