anchor.diff:  
   * `X-Cf-RouterError` is populated if the Gorouter encounters an error. The returned values can
      help distinguish whether a non-2xx response code is due to an error in the Gorouter
  -   or the backend. For more information on the possible errors, see
  +   or the back end. For more information on the possible errors, see
      the [Router Errors](#router-errors) section.
   
   ##### <a id="router-errors"></a> Router Errors
  
positive.code:   </tr>
    <tr>
      <td><code>endpoint_failure</code></td>
      <td>The registered endpoint for the desired route failed to handle the request.</td>
    </tr>
  </table>
  
negative.code: 
  <table>
    <tr>
      <th>Value<sup>*</sup></th>
      <th>Description</th>
    </tr>
    <tr>
  