the request</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">req</td><td>the request. </td></tr>
    <tr><td class="paramname">err</td><td>the error to include in the response header. If <code>NULL</code>, no error.</td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>an error, if any. </dd></dl>

</div>
</div>
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