title: NSMutableURLRequest - HTTPBody from Swift Array
body: <p>I need to send a post request to my server with HTTPBody of Array. Here's my array of parameters:</p>
  
  <pre><code>params = [
              "message"  : [
                  "alert" : "Find your iPhone",
                  "sound" : "Binocular_Default.caf"
              ]
          ]
  </code></pre>
  
  <p>Now I need to set <code>NSMutableURLRequest</code>'s <code>HTTPBody</code> to this array. How can I do that?</p>