is there any way that i can forward the logged on user as an HTTP header for example from the PA to the backend server when i use clientless vpn, this way i can achieve that the user wont need to be re-authnticate to the backend server
You'll have to put in a feature request for if it's something you need. While you can pull the user-id information from the header information, the firewall can't insert the user into a header like a proxy would.
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