request.swift

struct User: Codable {
  let userId: Int
  let id: Int
  let title: String
  let completed: Bool
}

private func makeRequest() {
   let url = URL(string: "https://jsonplaceholder.typicode.com/todos/1")!
   let urlRequest = URLRequest(url: url, cachePolicy: .returnCacheDataElseLoad, timeoutInterval: 1.0)
   
   let urlSession = URLSession(configuration: .default)
   let dataTask: URLSessionDataTask
    
   dataTask = urlSession.dataTask(with: urlRequest) { (data, urlResponse, error) in
     if let error = error {
       print(error.localizedDescription)
     } else if let data = data {
       let jsonDecoder = JSONDecoder()
       let user = try! jsonDecoder.decode(User.self, from: data)
       print(user.title)   
     }
   }
   dataTask.resume()
 }