vides buffer oriented HTTP message serialization functionality.</span>
<span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">bool</span> <span class="identifier">isRequest</span><span class="special">,</span>
    <span class="keyword">class</span> <span class="identifier">Body</span><span class="special">,</span>
    <span class="keyword">class</span> <span class="identifier">Fields</span> <span class="special">=</span> <span class="identifier">fields</span>
<span 