The Responder class provides an object that is used in
NetConnection.call() to handle return values from the server related to
the success or failure of specific operations. When working with
NetConnection.call(), you may encounter a network operation fault specific
to the current operation or a fault related to the current connection
status. Operation errors target the Responder object instead of the
NetConnection object for easier error handling.
Constructor
new(result:Function, ?status:Function)
Creates a new Responder object. You pass a Responder object to
NetConnection.call() to handle return values from the server. You may
pass null for either or both parameters.