Get current page.

        :return int: page number

def page(self):
        """ Get current page.

        :return int: page number

        """
        if not self._page:
            try:
                self._page = self.paginator.page(
                    self.query_dict.get('page', 1))
            except InvalidPage:
                raise HttpError("Invalid page", status=HTTP_400_BAD_REQUEST)
        return self._page