code: public Observable<Void> getPropertiesFromTaskAsync(String jobId, String taskId, String filePath) {
          return getPropertiesFromTaskWithServiceResponseAsync(jobId, taskId, filePath).map(new Func1<ServiceResponseWithHeaders<Void, FileGetPropertiesFromTaskHeaders>, Void>() {
              @Override
              public Void call(ServiceResponseWithHeaders<Void, FileGetPropertiesFromTaskHeaders> response) {
                  return response.body();
              }
          });
      }
docs: Gets the properties of the specified task file.
  
  @param jobId The ID of the job that contains the task.
  @param taskId The ID of the task whose file you want to get the properties of.
  @param filePath The path to the task file that you want to get the properties of.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponseWithHeaders} object if successful.