Force iControl (not iControl.REST) to use HTTPS

iControl uses SOAP over HTTPS. When you instantiate a connection to BigIP, you must use either the management IP or a SelfIP on port 443. Your SOAP connection must be established with an open socket to the iControl API, and because the BigIP doesn't accept plaintext connections (it only listens on port 443 with an SSL certificate), all iControl communications occur through SSL.

Is there a specific issue that you are having that is driving your question?