Limit-RPS annotation how can be use with Custom header

[vasim-test]

I have set limit-rps annotation to restrict number of connections from particular IP at ingress. I am student and stuck in problem where I want to understand.

1. Which header does limit-rps use to identify particular IP from client.
2. If limit-rps is using X-Forwarded-For header then what should I do if my Client IP is getting captured in custom header like Client-External-IP.
3. How to make limit-rps work with this custom header Client-External-IP to know the IP.

[k8s-ci-robot]

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