title: How to send POST parameters in Swift?
body: <p>Here some code:</p>
  
  <pre><code>var URL: NSURL = NSURL(string: "http://stackoverflow.com")
  var request:NSMutableURLRequest = NSMutableURLRequest(URL:URL)
  request.HTTPMethod = "POST"
  request.HTTPBody = ?????? 
  NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) 
  {
      (response, data, error) in
      println(NSString(data: data, encoding: NSUTF8StringEncoding))
  }
  </code></pre>
  
  <p>What should I write in <code>request.HTTPBody</code> if I want send POST query <code>"key" = "value"</code> ?</p>