title: Why is the `Arr-Disable-Session-Affinity` header coming through on my Azure Web App (WebSite)?
body: <p>Following the procedure in <a href="http://azure.microsoft.com/blog/2013/11/18/disabling-arrs-instance-affinity-in-windows-azure-web-sites/" rel="noreferrer">this article</a> I disabled the ARR Affinity cookie on my Azure Web App with this header in my responses:</p>
  
  <pre><code>Arr-Disable-Session-Affinity: True
  </code></pre>
  
  <p>It <em>does</em> remove the cookie, which is very much a good thing. But, the header itself is still coming through. This header doesn't really hurt anything, but according to that same doc it shouldn't be there:</p>
  
  <blockquote>
    <p>If you add the Arr-Disable-Session-Affinity header to disable the affinity cookie, ARR will not set the cookie, but <strong>it will also remove the Arr-Disable-Session-Affinity header itself,</strong> so if your process is working correctly, you will see neither.</p>
  </blockquote>
  
  <p>So...how do I get it to remove the header, too?</p>