This is a great & informative answer. PhantomJS allows an attacker to get past any progressive challenge but it is nice that there is something else to go on. A

This is a great & informative answer. PhantomJS allows an attacker to get past any progressive challenge but it is nice that there is something else to go on. A properly-executed PhantomJS DDoS is a scary thing, it's great that you have some methods of mitigation.