Make url absolute using previous request url as base url.

def make_url_absolute(self, url, resolve_base=False):
        """
        Make url absolute using previous request url as base url.
        """

        if self.config['url']:
            if resolve_base:
                ubody = self.doc.unicode_body()
                base_url = find_base_url(ubody)
                if base_url:
                    return urljoin(base_url, url)
            return urljoin(self.config['url'], url)
        else:
            return url