We can not say with certainty what data the web server would return. If there's a better way to determine the true version rather then some random data, please feel free to share.

@SteffenUllrich Yes, you're absolutely right but the OP is asking if there is a way, not whether it is reliable but as you have already stated the information returned might be true, might be completely wrong or not present at all but on the other hand we could also assume that the web app is behind a proxy :-)

Or does ephemeral in the context of RSA mean that it would require a NEW RSA key-pair (pub-priv) for EACH SINGLE connection establishment (TCP 3 Way - TLS handshake) ?

Thank you. So I guess it is safe to say that RSA in TLS is ephermal because it generates for each session a random number thus computing a unique symmetric session key from it for each connection but it does not provide Perfect Forward Secrecy because once the servers private key is compromised all the previously captured and encrypted traffics can now be decrypted basically nullifying the value of using ephemeral session keys? Or am I still mixing things up ?