      or HTTP specific fields. The object will be called with this
                      equivalent signature:
                    </p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"> <span class="keyword">void</span> <span class="identifier">decorator</span><span class="special">(</span>
    <span class="identifier">request_type</span><span class="special">&amp;</span> <span class="identifier">req</span>
<span class="special">);</span>
</pre>
          