def server_side(connection, window_info, kwargs):
    """never allows a signal to be called from WebSockets; this signal can only be called from Python code.
    This is the default choice.

    >>> # noinspection PyShadowingNames
    ... @signal(is_allowed_to=server_side)
    ... def my_signal(window_info, arg1=None):
    ...     # noinspection PyUnresolvedReferences
    ...     print(window_info, arg1)
    """
    return False