Sets up live server, and then loops over handling http requests.

def run(self):
        """
        Sets up live server, and then loops over handling http requests.
        """
        try:
            # Go through the list of possible ports, hoping we can find
            # one that is free to use for the WSGI server.
            for index, port in enumerate(self.possible_ports):
                try:
                    self.httpd = self._create_server(port)
                except socket.error as e:
                    if (index + 1 < len(self.possible_ports) and
                            e.error == errno.EADDRINUSE):
                        # This port is already in use, so we go on and try with
                        # the next one in the list.
                        continue
                    else:
                        # Either none of the given ports are free or the error
                        # is something else than "Address already in use". So
                        # we let that error bubble up to the main thread.
                        raise
                else:
                    # A free port was found.
                    self.port = port
                    break

            self.is_ready.set()
            self.httpd.serve_forever()
        except Exception as e:
            self.error = e
            self.is_ready.set()