Request using lang=fr not returning xml results

When using lang=fr (for results from a french website), my xml file is empty. The request does not return anything. the xml display is blank. I am forced to use a browser, then view source, then paste it into an xml file. Anyone experience this?
Example of request:
http://[website address]/webapp/wcs/stores/servlet/keyword?input=[search string]&storeId=[wcs store id]&&ro=[record offset]&rpp=[records per page]&lang=[language]&store_number=[store number]