Serializing</a>
        </h6>
<p>
          If this is <code class="computeroutput"><span class="keyword">true</span></code> and <code class="computeroutput"><span class="identifier">data</span></code> is <code class="computeroutput"><span class="keyword">nullptr</span></code>,
          the error <a class="link" href="../boost__beast__http__error.html" title="http::error"><code class="computeroutput"><span class="identifier">error</span><span class="special">::</span><span class="identifier">need_buffer</s