urlsample.swift

import XCPlayground
import Foundation

XCPlaygroundPage.currentPage.needsIndefiniteExecution=true

var imageURL = NSURL(string : "https://www.nasa.gov/sites/default/files/wave_earth_mosaic_3.jpg")

if let url = imageURL{
    
    let task = NSURLSession.sharedSession().dataTaskWithURL(url, completionHandler: { (data, response, error) in
        if (error != nil) {
            print("The error is \(error!)")
        } else {
            if let theData=data {
                print("The data length is \(theData.length)")
            }
        }
    })
    
    task.resume()
}