span>
    <span class="keyword">class</span> <span class="identifier">Derived</span><span class="special">&gt;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span>
<a class="link" href="boost__beast__http__read_header/overload2.html" title="http::read_header (2 of 2 overloads)">read_header</a><span class="special">(</span>
    <span class="identifier">SyncReadStream</span><span class="special">&amp;</span> <span class="identifier">stream</span><span