Sandbox test for a GET HTTP request on OSX

HttpRequest.playground.swift

import Foundation
import XCPlayground

func httpGet(request: NSURLRequest!, callback: (NSURLResponse?, String, String?) -> Void) {
    let session = NSURLSession.sharedSession()
    let task = session.dataTaskWithRequest(request) {
        (data, response, error) -> Void in
        if error != nil {
            callback(response, "", error!.localizedDescription)
        } else {
            let result = NSString(data: data!, encoding:
                NSASCIIStringEncoding)!
            callback(response, result as String, nil)
        }
    }
    task.resume()
}

var request = NSMutableURLRequest(URL: NSURL(string: "https://httpbin.org/get")!)
request.HTTPMethod = "GET"
request.setValue("application/json", forHTTPHeaderField: "Accept")

httpGet(request){
    (response, data, error) -> Void in
    if error != nil {
        print(error)
    } else {
        let httpResponse = (response as? NSHTTPURLResponse)
        print(httpResponse?.statusCode)
        print(httpResponse?.allHeaderFields)
        print(response?.MIMEType)
        print(data)
    }
}

XCPlaygroundPage.currentPage.needsIndefiniteExecution = true