RLS and CORS

Potential noob question. I am trying to find out if I can check the origin of a call to my supabase instance within RLS.

Basically, along with user authentication, I want to only accept calls from hhtps://www.example.com. Is this something that is possible?

Otherwise if it is not possible, is it at all necessary? If I want to say ensure that only people signing up from a specific domain are able to do so, how would I make that happen using RLS?
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