Using api_key for restrict access

Hi,

I’m newbie in using graphhopper. So far I’ve been running graphhopper on my own server. I wonder if it is possible to implement api_key on both frontend and backend to restrict access.

api_key that I mean the key in this url:

https://example.graphhopper.com/route?point=-1.2222%2C2.3333&point=-3.44444%2C5.6666&type=json&key=&profile=car

if possible how can i do it?

Thank you in advance

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