protected UnityWebRequestAsyncOperation Send(UnityWebRequest request, IEnumerable <KeyValuePair <string, object> > headers) { var hx = headers?.ToList() ?? new List <KeyValuePair <string, object> >(); var pRef = hx.FetchHeader <WeakReference <IProgress <float> > >(InternalHeaders.ProgressObject); if (null == pRef) { return(request.AppendHeaders(hx).SendWebRequest()); } var wrapper = new UnityWebRequestReporter.ReporterWrapper(pRef, request); UnityWebRequestReporter.AddReporterRef(requestId, wrapper); return(request.SendWebRequest()); }