'Get Authenticated user in a React JS app which is behind Google IAP

I have a React JS app which is behind the Google IAP. I need to get the IAP authenticated user email and use it in the app. How can I do that?

IAP adds X-Goog-Authenticated-User-Email header to the request. But I wonder if there is a way to get it since React runs on the client side? (There are SO answers for getting this header from server side)

Note: NGINX serves the static files of the React app and it is in GKE

reactjsauthenticationnginxgoogle-iap


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