docs: def sort_url_qsl(cls, raw_url, **kwargs):
          """Do nothing but sort the params of url.
  
              raw_url: the raw url to be sorted; 
              kwargs: (optional) same kwargs for ``sorted``.
          """
          parsed_url = urlparse(raw_url)
          qsl = parse_qsl(parsed_url.query)
          return cls._join_url(parsed_url, sorted(qsl, **kwargs))