def _build_send_args(self, **kwargs):
        """Merge optional arguments with defaults.

        :param kwargs: Keyword arguments to `Session::send`

        """
        out = {}
        out.update(self._default_send_args)
        out.update(kwargs)
        return out
Merge optional arguments with defaults.

        :param kwargs: Keyword arguments to `Session::send`

        
robobrowser/browser.py