</code>, <code class="computeroutput"><span class="identifier">body_</span></code>, and <code class="computeroutput"><span class="identifier">trailers_</span></code>
            may only be default-constructed, since there are no explicitly declared
            constructors.
          </li>
<li class="listitem">
            There is no way to defer the commitment of the <span class="bold"><strong>Body</strong></span>
            type to after the headers are read in. This is related to the previous
        