docs: def _split_url_string(query_string):
          """
          Turns a `query_string` into a Python dictionary with unquoted values
          """
          parameters = parse_qs(to_utf8(query_string), keep_blank_values=True)
          for k, v in parameters.iteritems():
              parameters[k] = urllib.unquote(v[0])
          return parameters