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Matt MetrosMatt Metros 

Retrieving XML from RSS feed and displaying that in lightning Component

    public static List<Dom.XMLNode> search(String remoteSiteURL, String query)

        String url = remoteSiteURL + EncodingUtil.urlEncode(query, 'UTF-8');

        Http h = new Http();
        HttpRequest req = new HttpRequest();
        // url that returns the XML in the response body  

        HttpResponse res = h.send(req);
        Dom.Document doc = res.getBodyDocument();

        Dom.XMLNode rss = doc.getRootElement();


I am not sure if I need to convert this into JSON.
Abdul KhatriAbdul Khatri
How the response look with 
Isn't that JSON

You can just try the url in the browser and see what response you can get.