Openlayers 3 Vaadin - GetFeatureInfoUrl

Hello, I am using OpenLayer 3 vaadin's demo and I meet some problems..

I implemented a ClickListerner on my map.
I would like to use GetFeatureInfoUrl with a single click on my map but I get the same url, no matter where I place the mouse.

Exemple 1 : I clicked on Nigeria, I get coordinates : 93.27
 

Exemple 2 : Then, I clicked on Sudan, I get the same cordinnates !!

Code example : 

protected OLSource createSource() {
        OLTileWMSSourceOptions options = new OLTileWMSSourceOptions();
        // WebMapService of World http://www.osm-wms.de/
        options.setUrl("http://129.206.228.72/osm-wms");
        Map<String, String> params = new HashMap<String, String>();
        params.put("LAYERS", "osm_auto:all");
        params.put("FORMAT", "image/png");
        options.setParams(params);
        options.setGutter(2.0);
        return new OLTileWMSSource(options);
    }

protected OLView createView() {
        OLViewOptions opts = new OLViewOptions();
        // this is the projection this map server expects
        // same as EPSG: 3857 but the map server does not recognize that...
        opts.setMapProjection("EPSG:900913");
        opts.setInputProjection(Projections.EPSG4326);
        OLView view = new OLView(opts);
        view.setZoom(4);
        view.setCenter(0, 0);
        view.setResolution(10000);
        return view;
    }

protected void doOnClick(OLMap.OLClickEvent clickEvent) {
        for (int i = 0; i < clickEvent.getFeatureInfoUrls().size(); i++) {
            System.out.println("i : " + i + " - " + clickEvent.getFeatureInfoUrls().get(i));
            Notification.show("hey :"+excutePost(clickEvent.getFeatureInfoUrls().get(i), ""));
        }
    }

    public static String excutePost(String targetURL, String urlParameters) {
        HttpURLConnection connection = null;
        try {
            //Create connection
            URL url = new URL(targetURL);
            connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("POST");
            connection.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");

            connection.setRequestProperty("Content-Length",
                    Integer.toString(urlParameters.getBytes().length));
            connection.setRequestProperty("Content-Language", "en-US");

            connection.setUseCaches(false);
            connection.setDoOutput(true);

            //Send request
            DataOutputStream wr = new DataOutputStream(
                    connection.getOutputStream());
            wr.writeBytes(urlParameters);
            wr.close();

            //Get Response  
            InputStream is = connection.getInputStream();
            BufferedReader rd = new BufferedReader(new InputStreamReader(is));
            StringBuilder response = new StringBuilder(); // or StringBuffer if not Java 5+ 
            String line;
            while ((line = rd.readLine()) != null) {
                response.append(line);
                response.append('\r');
            }
            rd.close();
            return response.toString();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
        }
    }

While coordinates of my mouse are different.. So I think, GetFeatureInfoUrl() doesn't take coordinates from my mouse. Do you have an idea ? thanks you !