identifier">header_cb</span><span class="special">);</span>

    <span class="comment">// Declare the chunk body callback. This is called one or</span>
    <span class="comment">// more times for each piece of a chunk body.</span>
    <span class="keyword">auto</span> <span class="identifier">body_cb</span> <span class="special">=</span>
    <span class="special">[&amp;](</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier"