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<div class="highlight"><pre><span class="kd">var</span> <span class="nx">xhr</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">XMLHttpRequest</span><span class="p">();</span>
<span class="nx">xhr</span><span class="p">.</span><span class="nx">open</span><span class="p">(</span><span class="s1">&#39;GET&#39;</span><span class="p">,</span> <span class="s1">&#39;{{ ping_url }}&#39;</span><span class="p">,</span> <span class="kc">true</span><span class="p">);</span>
<span class="nx">xhr</span><span class="p">.</span><span class="nx">send</span><span class="p">(</span><span class="kc">null</span><span class="p">);</span>
</pre></div>