an class="s">reviews-foo-bar</span>
<span class="na">spec</span><span class="pi">:</span>
  <span class="na">destination</span><span class="pi">:</span>
    <span class="na">name</span><span class="pi">:</span> <span class="s">reviews</span>
  <span class="na">precedence</span><span class="pi">:</span> <span class="s">2</span>
  <span class="na">match</span><span class="pi">:</span>
    <span class="na">request</span><span class="pi">:</span>
      <span class="na">headers</span><span class="pi">:</span>
  