lete.
    The handler must be invokable with this signature:
    @code
    template&lt;class Body&gt;
    void handler(request&lt;Body&gt;&amp;&amp; req);
    @endcode

    @throws system_error Thrown on failure.
*/</span>
<span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">class</span> <span class="identifier">SyncReadStream</span><span class="special">,</span>
    <span class="keyword">class</span> <span class="identifier">DynamicBuffer</span><span class="speci