  <code class="computeroutput"><span class="identifier">a</span></code> denotes a value of
            type <code class="computeroutput"><span class="identifier">W</span></code>.
          </li>
<li class="listitem">
            <code class="computeroutput"><span class="identifier">h</span></code> denotes a const value
            of type <code class="computeroutput"><span class="identifier">header</span><span class="special">&lt;</span><span class="identifier">isRequest</span><span class="special">,</span>