title: AVPlayer not playing URL from backend
body: <p>I'm using AVPlayer to play URL's i'm fetching from my backend.  Initially, I was downloading the items to my documents directory and used the urls to play the files via <code>AVAudioPlayer</code>.  I switched over to <code>AVPlayer</code> so I can stream the audio instead of downloading them.  I see that the URL's are being fetched successfully, but once I try to play them I get no audio.  Below is an example of a URL i'm fetching:</p>
  
  <p>/Users/ellie/Desktop/ellie/sound/uploads/ellie1/Track5.m4a </p>
  
  <pre><code>var player: AVPlayer!
  var fetchedURL: NSURL?
  
  func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
      //I left out the fetching process
      self.fetchedURL = NSURL(string:parseString!)
      print("fetchedURL is \(self.fetchedURL!)")
      self.playCell()
  }
  
  func playCell() {
  
      let audioSession: AVAudioSession = AVAudioSession.sharedInstance()
  
      do {
          try audioSession.setCategory(AVAudioSessionCategoryPlayback)
      } catch _ {
      }
  
      do {
          try audioSession.setActive(true)
      } catch _ {
      }
  
      print("fetchedURL is \(self.fetchedURL!)")
      player = AVPlayer(URL:self.fetchedURL!)
      player.play()
  }
  </code></pre>