o send back as part of the HTTP response.</p>
<h3 id='usage-example' class='heading'>Usage Example:</h3>
<pre class="highlight swift"><code><span class="n">response</span><span class="o">.</span><span class="n">headers</span><span class="p">[</span><span class="s">"Content-Length"</span><span class="p">]</span> <span class="o">=</span> <span class="p">[</span><span class="kt">String</span><span class="p">(</span><span class="n">theBody</span><span class="o">.</span><span class="n">count</span><span class="p