import UIKit //playgroundで実行する際に必要なだけ import XCPlayground //Construct url object via string var url = NSURL(string: "http://www.example.com/") let config = NSURLSessionConfiguration.defaultSessionConfiguration() let session = NSURLSession(configuration: config) var req = NSURLRequest(URL: url!) //NSURLSessionDownloadTask is retured from session.dataTaskWithRequest var task = session.dataTaskWithRe