Do you solve it using the "Under Attack" mode on CF where it shows the "redirecting in 5 seconds" msg? I am curious how CF takes care of the DDOS.
The biggest thing we do to help ourselves when we're under attack is making sure that the pages being ddosed (homepage, etc) is being cached by them. There will always be some requests that CF doesnt block, so the cache ensures they get served by them.
What about pages which can't be cached? For example an updated comment feed? How would you deal with dynamic data?
If they attack a dynamic page, check if you can cache them for 30 or 60 seconds. Pretty close to real time.
If you have cookie based authentication for those pages, its going to be difficult to cache them at all though. Which is where SPAs come in useful since auth is client side.
https://www.cloudflare.com/en-ca/learning/cdn/caching-static...