lass="o">!</span>
  <span class="k">let</span> <span class="nv">error</span> <span class="o">=</span> <span class="n">response</span><span class="o">.</span><span class="n">error</span><span class="o">!</span>
  <span class="c1">// ...</span>
<span class="p">}</span>
</code></pre>
<h2 id='12-instrument-behavioral-events' class='heading'>12. Instrument Behavioral Events</h2>

<p>The iOS Client sends behavioral events to <a href="http://constructor.io/">Constructor.io</a> in order to continuously learn and im