+ webpage, 'json vp url', default=None)
+ if not json_url:
+ iframe_url = self._html_search_regex(
+ r'<iframe[^>]+src=(["\'])(?P<url>.+\bjson_url=.+?)\1',
+ webpage, 'iframe url', group='url')
+ json_url = compat_parse_qs(
+ compat_urllib_parse_urlparse(iframe_url).query)['json_url'][0]