title: IOS Swift 3 Alamofire 4.0.0
body: <p>Here is my code facing error at <code>NSMutable</code> line:</p>
  
  <pre><code>import UIKit
  import Alamofire
  
  class ViewController: UIViewController {
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
          let url = NSURL(string: "http://jsonplaceholder.typicode.com/users")
          var request = NSMutableURLRequest(URL:url!)
          request.HTTTPMethod = "GET"
          request.setValue("application/json",forHTTTPHeaderField:"Content-Type")
          Alamofire.request(request).responseJSON{
              response in
              switch resposnse.result{
              case.Success(let data):
                  print("Successfully grabbed response",data)
              case.Failure(let error):
                  print("request failed with error\(error)")
              }
          }
      }
  
      override func didReceiveMemoryWarning() {
          super.didReceiveMemoryWarning()
          // Dispose of any resources that can be recreated.
      }
  }
  </code></pre>
  
  <p>Please, can someone resolve my issue?</p>