public void Listen(int port, string address="")
{
/*Starts an HTTP server for this application on the given port.
This is a convenience alias for creating an HTTPServer object
and calling its listen method. Keyword arguments not
supported by HTTPServer.listen are passed to the HTTPServer
constructor. For advanced uses (e.g. preforking), do not use
this method; create an HTTPServer and call its bind/start
methods directly.
Note that after calling this method you still need to call
IOLoop.instance().start() to start the server.
*/
// import is here rather than top level because HTTPServer
// is not importable on appengine
var server = new HTTPServer(Call);
server.listen(port, address);
}