code>NULL</code>.</p>
<dl class="section warning"><dt>Warning</dt><dd>The string belongs to the message and must not be freed. Copy it if needed.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">req</td><td>the request. </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
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