an class="comment">/// results from the request.</span>
    <span class="keyword">void</span> <span class="identifier">set_response_stream</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">concurrency</span><span class="special">::</span><span class="identifier">streams</span><span class="special">::</span><span class="identifier">ostream</span> <span class="special">&amp;</span><span class="identifier">stream</span><span class="special">);</span>
    <span clas