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<title>API Changes in Apache HTTP Server 2.6 since 2.4 - Apache HTTP Server Version 2.5</title>
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<a href="https://www.apache.org/">Apache</a> &gt; <a href="https://httpd.apache.org/">HTTP Server</a> &gt; <a href="https://httpd.apache.org/docs/">Documentation</a> &gt; <a href="../">Version 2.5</a></div><div id="page-content"><div id="preamble"><h1>API Changes in Apache HTTP Server 2.6 since 2.4</h1>
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  <p>This document describes changes to the Apache HTTPD API from
     version 2.4 to 2.6, that may be of interest to module/application
     developers and core hacks.  As of the first GA release of the
     2.6 branch API compatibility is preserved for the life of the
     2.6 branch.  (The
     <a href="http://svn.apache.org/repos/asf/httpd/httpd/branches/2.6.x/VERSIONING">VERSIONING</a>
     description for the 2.6 release provides more information about API
     compatibility.)</p>

  <p>API changes fall into two categories: APIs that are altogether new,
     and existing APIs that are expanded or changed.  The latter are
     further divided into those where all changes are backwards-compatible
     (so existing modules can ignore them), and those that might
     require attention by maintainers.  As with the transition from
     HTTPD 2.2 to 2.4, existing modules and applications will require
     recompiling and may call for some attention, but most should not
     require any substantial updating (although some may be able to
     take advantage of API changes to offer significant improvements).</p>
  <p>For the purpose of this document, the API is split according
     to the public header files.  These headers are themselves the
     reference documentation, and can be used to generate a browsable
     HTML reference with <code>make docs</code>.</p>
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<div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif"> <a href="#api_changes">Changed APIs</a></li>
<li><img alt="" src="../images/down.gif"> <a href="#upgrading">Specific information on upgrading modules from 2.4</a></li>
</ul></div>
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<h2 id="api_changes">Changed APIs <a title="Permanent link" href="#api_changes" class="permalink">&para;</a></h2>
  

  <h3 id="ap_fill_me_in">ap_fill_me_in (NEW!)</h3>
    
    <p>Introduces a new API to fill me in.</p>
  

  <h3 id="http_request">http_request (changed)</h3>
    
    <ul>
      <li>New autht_provider API</li>
      <li>New <code>token_checker</code> hook to handle authentication based on
          mechanisms other than username and password.</li>
      <li>New function <code>ap_hook_check_autht</code>, as an addition to
          <code>ap_hook_check_authn</code> and <code>ap_hook_check_authz</code>.</li>
    </ul>
  

  <h3 id="mod_auth">mod_auth (changed)</h3>
    
    <p>Adds an additional provider framework for autht - token authentication.</p>
  

</div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif"></a></div>
<div class="section">
<h2 id="upgrading">Specific information on upgrading modules from 2.4 <a title="Permanent link" href="#upgrading" class="permalink">&para;</a></h2>
  

  <h3 id="upgrading_fillmein">Fill me in</h3>
    
    <p>In order to take advantage of fill me in.</p>
  

  <h3 id="upgrading_byfunction">If your module uses these existing APIs...</h3>
    

    <dl>
      <dt><code>ap_md5digest()</code> / <code>ap_md5contextTo64</code></dt>
      <dd>These functions are no longer available. Use the equivalent functions
          from APR if needed.</dd>

    </dl>
  

  <h3 id="upgrading_byfeature">If your module interfaces with this feature...</h3>
    
    <dl>
      <dt>fillmin</dt>
      <dd>Optional: If your module fills me in.</dd>

    </dl>
  

  <h3 id="upgrading_newfeatures">Does your module...</h3>
    
    <dl>
    <dt>Fill me in</dt>
    <dd>Consider if filling me in.</dd>

    </dl>
  

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