Best CF tool for mitigating load from known source

We have an app that performs great for normal human users but struggles when a marketing email goes out and Microsoft resolves all the URLs for their Safe Links function. It overloads our app in a short burst of requests in a few minutes.

As these requests are from a known IP range, I think we could:

  • rate limit them for Microsoft only
  • cache them for Microsoft only

Anyone have any advice on the best CF tool too use?

What do you think would happen to their Safe Links check if you JS Challenged their bot? Would it give the link a failing grade?

Good idea, I guess I will have to run some tests and see.

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