'Format message for logging.
`format_str` is a string with old-style Python format escaping;
`args` is an array of values to fill into the string.'

def _format_msg(self, format_str, *args):

    if (not args):
        format_str = urllib.unquote(format_str)
    return u'{0}    -    -    [{1}]    {2}\n'.format(self.client_address[0], self.log_date_time_string(), (format_str % args))
