"no http answer" error when running geometry service

Question

I want to union all the features in the layer, but when running geometryService.UnionAsync, it causes an error "no http answer", I tried other services such as AreasAndLengthsAsync of the GeometryService but causes the same error. My codes are paste below, anyone can give me any suggestions? Thanks.

LocalGeometryService.GetServiceAsync(localGeometryService =>
            {
                // Create a new GeometryService task instance.
                geometryTask = new GeometryService();

// Set the Url property to the Url of the LocalGeometryService.
                geometryTask.Url = localGeometryService.UrlGeometryService;

// Register event handlers for the BufferCompleted and Failed events.
                geometryTask.UnionCompleted += GeometryService_UnionCompleted;
                geometryTask.Failed += GeometryService_Failed;
            });

//after query and got all the features
void QueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)
        {
            FeatureSet featureSet = args.FeatureSet;

selectedGraphics = featureSet.Features as List<Graphic>;
           //start union
           geometryTask.UnionAsync(selectedGraphics);
         }

MichaelBranscomb · Answer

Hi,

Does the Union sample in the sample application work? (Geometry > Geometry Operations > Union).

Cheers

Mike

RichardWatson · Answer

See if HTTP is enabled under security for ArcGIS Server.

I believe that the options are HTTP, HTTPS, plus HTTP and HTTPS.

If this is the problem then there is probably some way to tell the API to use HTTPS.