How to add a client-certificate to a javascript restcall?

Using the NativeRest’s CallRestService activity We implemented it in a nanoflow in this way: The $Header contains the basic authentication: '{"authorization": "Basic '+ @someconstant_containing_Base64encoded_uid&pwd + '=",  "Content-Type": "application/json"}' So far so good. All is working fine. But: How can we replace the basic authentication to a client certificate in this javascript rest call? We know that we can add the client-certificate to the server, but how can the client (a hand scanner in our case): retrieve the certificate add the certificate to the rest call?   Hm, found this: Let's try if I can take it from there.
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