 </li>
<li class="listitem">
            Defer the commitment to a <a class="link" href="../concepts/Body.html" title="Body"><span class="bold"><strong>Body</strong></span></a> type until after reading the header.
          </li>
</ul></div>
<p>
        These types of operations require callers to manage the lifetime of associated
        state, by constructing a class derived from <a class="link" href="../ref/boost__beast__http__basic_parser.html" title="http::basic_parser"><code class="computeroutput"><sp