$url->netloc([netloc])
When invoked with no parameters, this method returns the network location for the
URL defined in the object. The network location is a string composed
of "user:password@host:port", where the user, password, and port may be omitted
when not defined. When netloc is invoked with a parameter, the object's
network location is defined to that value. Changes to the network location
are reflected in the user, password, host, and port methods.