Following the procedure in this article I disabled the ARR Affinity cookie on my Azure Web App with this header in my responses:
Arr-Disable-Session-Affinity: True
It does 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:
If you add the Arr-Disable-Session-Affinity header to disable the affinity cookie, ARR will not set the cookie, but it will also remove the Arr-Disable-Session-Affinity header itself, so if your process is working correctly, you will see neither.
So...how do I get it to remove the header, too?