Swift Xcode 6.1.1 POST request is not published

I just want to POST some data from Swift to a PHP script. I've been Googled for two days now and everyone seems to be doing the same thing, but it doesn't work for me. I have this Swift code running on viewDidLoad ()

override func viewDidLoad() {
    super.viewDidLoad()

    let request = NSMutableURLRequest(URL: NSURL(string: "http://mywebsite.com/scriptToHandlePOST.php")!) // it forces me to add the !
    request.HTTPMethod = "POST"

    var err: NSError?
    let postString = "var1=value1&var2=value2".dataUsingEncoding(NSUTF8StringEncoding)
    var postLength:NSString = String( postString!.length )

    request.HTTPBody = postString
    request.setValue(postLength, forHTTPHeaderField: "Content-Length")
    request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
    let task = NSURLSession.sharedSession().dataTaskWithRequest(request){ data, response, error -> Void in
        var strData = NSString(data: data, encoding: NSUTF8StringEncoding)

        println(response) // this returns a 200
        println(strData!) // this returns an empty array of the $_POST variable
    }

    task.resume() // this is needed to start the task

}

      

        
        
        
      

    

My PHP script is just trying to get the $ _POST data:

<?php

print_r($_POST);

?>

      

        
        
        
      

    

Since $ _POST returns an empty array, I suspect that the POST request never gets to my site. Do you see something wrong in the code?