public async Task <List <RssParser.FeedItem> > GetItemsAsync(string feed)
        {
            RssParser rssParser = new RssParser();

            switch (feed.ToLower())
            {
            case "shortage":
            case "shortages":
                return(await rssParser.GetListAsync(shortageURL));

            case "dc":
            case "discontinued":
                return(await rssParser.GetListAsync(discontinuedURL));

            case "resolved":
                return(await rssParser.GetListAsync(resolvedURL));

            case "unavailable":
            case "notavailable":
                return(await rssParser.GetListAsync(notavailableURL));

            default:
                return(await rssParser.GetListAsync(shortageURL));
            }
        }