title: Status code when deleting a resource using HTTP DELETE for the second time
body: <p>Given that the DELETE verb in HTTP is idempotent, when I issue the following request, what should happen the second (or third, or fourth, etc...) time I make it?</p>
  <pre><code>DELETE /person/123
  </code></pre>
  <p>The first time, the resource is deleted and I return a 204 (successful, no content). Should I return a 204 on subsequent calls or a 404 (not found)?</p>