You might have found out it yourself but just for the sake of completeness I'm adding to my response. You can certainly set HTTP headers when using the HTTP client to call an URL but in Web Dynpro ABAP you don't have access to the request object (at least not through public APIs) hence you can't parse the HTTP headers. The only feasible solution is to implement a custom ICF handler, parse the HTTP headers in it and call the receiving WDA with URL parameters (or use some other data sharing functionality).
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