def init_app(self, app):
        """
        Adds the flask url routes for the apidoc files.
        :param app: the flask application.
        """

        self.app = app

        self.dynamic_url = self.app.config.get('APIDOC_DYNAMIC_URL', self.dynamic_url)
        self.allow_absolute_url = self.app.config.get('APIDOC_ALLOW_ABSOLUTE_URL', self.allow_absolute_url)

        url = self.url_path

        if not self.url_path.endswith('/'):
            url += '/'

        app.add_url_rule(url, 'docs', self.__send_static_file, strict_slashes=True)
        app.add_url_rule(url + '<path:path>', 'docs', self.__send_static_file, strict_slashes=True)