'Load the rendered page, to detect redirects and zones.'

def load_prereq_rendered(self, storage, data):

    assert self.normalized_path
    rendered = storage.get_document_rendered(self.locale, self.slug)
    if (rendered is None):
        data[u'needs'].append((u'document_rendered', self.normalized_path, {}))
    else:
        data[u'has_rendered'] = True
        data[u'redirect_to'] = rendered.get(u'redirect_to')
        data[u'is_zone_root'] = rendered.get(u'is_zone_root', False)
        data[u'zone_css_slug'] = rendered.get(u'zone_css_slug', u'')
