docs: def best_match(supported, header):
      """Takes a list of supported mime-types and finds the best match for all the media-
      ranges listed in header. The value of header must be a string that conforms to the
      format of the HTTP Accept: header. The value of 'supported' is a list of mime-types.
  
      >>> best_match(['application/xbel+xml', 'text/xml'], 'text/*;q=0.5,*/*; q=0.1')
      'text/xml'
  
      """
      parsed_header = [parse_media_range(r) for r in header.split(",")]
      weighted_matches = [
          (fitness_and_quality_parsed(mime_type, parsed_header), mime_type)
          for mime_type in supported
      ]
      weighted_matches.sort()
      return weighted_matches[-1][0][1] and weighted_matches[-1][1] or ''