firstly {
  UIApplication.shared.isNetworkActivityIndicatorVisible = true
  return fetch(url: <backendURL>)
}.then { imageurl in
    return downloadImage(url: imageurl)
}.then { data in
    imageView.image = UIImage(data: data)
}.ensure {
    UIApplication.shared.isNetworkActivityIndicatorVisible = false
}.catch { error in
    // in case we have an error
}