="special">&gt;</span>
<span class="keyword">struct</span> <span class="identifier">basic_message</span>
<span class="special">{</span>
    <span class="keyword">typedef</span> <span class="identifier">Headers</span> <span class="identifier">headers_type</span><span class="special">;</span>
    <span class="keyword">typedef</span> <span class="identifier">Body</span> <span class="identifier">body_type</span><span class="special">;</span>

    <span class="identifier">headers_type</span> <span class="special