swift

let metadataUrl = URL(string: "https://www.andyibanez.com/fairesepages.github.io/tutorials/async-await/part1/\(imageNumber).json")!
let metadataTask = URLSession.shared.dataTask(with: metadataUrl) { data, response, error in
    guard let data = data, let metadata = try? JSONDecoder().decode(ImageMetadata.self, from: data),  (response as? HTTPURLResponse)?.statusCode == 200 else {
        completionHandler(nil, ImageDownloadError.invalidMetadata)
        return
    }
    let detailedImage = DetailedImage(image: image, metadata: metadata)
    completionHandler(detailedImage, nil)
}
metadataTask.resume()