Constructs the TensorBoard WSGI app and instantiates the server.

def _make_server(self):
    """Constructs the TensorBoard WSGI app and instantiates the server."""
    app = application.standard_tensorboard_wsgi(self.flags,
                                                self.plugin_loaders,
                                                self.assets_zip_provider)
    return self.server_class(app, self.flags)