ass="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
                The request is received and the response is sent.
              </li>
<li class="listitem">
                An error occurs.
              </li>
</ul></div>
<p>
            The algorithm, known as a <span class="emphasis"><em>composed operation</em></span>, is
            implemented in terms of calls to the next layer's <code class="computeroutput"><span class="identifier">read_some</span></code>
            and <code