cpt aims to be running in front of any https server. It forwards all requests that don't call for a "CONNECT .." to the normal https server. There is no error handling for misbuild requests. They go straight forward to the default server. A request that doesn't pass the conditions is passed forward too, the webserver will handle it (with the default error page). There will be no awareness that cpt is running as proxy.
These details are provided for information only. No information here is legal advice and should not be used as such.