Update request. The method will close the // http.Response Body if it receives an error. func (client ExperimentsClient) UpdateSender(req *http.Request) (future ExperimentsUpdateFuture, err error) {  var resp *http.Response  resp, err = client.Send(req, azure.DoRetryWithRegistration(client.Client))  if err != nil {   return  }  future.Future, err = azure.NewFutureFromResponse(resp)  return }  // Update