ios - URL File Size With NSURLConnection - Swift -

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I am trying to get a file size from the URL before downloading

obj here -c is the code 

  NS URL * URL = [NSD URL Youth Ringtones: "User url"]; NSMutableURLRequest * Request = [NSMutableURL request request with url: URL]; [Set http system: @ "head"]; NSHTTPURL response * feedback; [Send NSRR connection SynchronousAust: Returning Response Request: & amp; Reaction error: zero]; Longer size = [expected content lang];   
 and here swift code  
  var url: NSURL = NSURL (string: "ExmapleURL") var request: NSMutableURLRequest = NSMutableURLRequest (URL: url) request .HTTPMethod = "HEAD" var response = NSHTTPURLResponse () NSURLConnection.sendSynchronousRequest (Request, Returning Response: And Response, Error: Zero)   
 But I have an error here  < Previous>  NSURLConnection.sendSynchronousRequest (request, returning response: and response, error: zero) 'NSHTCPRSpons' is not similar to 'NSURLResponse?'   
 Did I miss something fast here?   
 
 
 The response parameter is type  
  AutoreleasingUnsafeMutablePointer & lt; NSURLResponse? & Gt;   
 Which means that you can give the argument of an  alternative   NSURLResponse  as arguments:  
  Var response: NSURLResponse? NSURLConnection.sendSynchronousRequest (Request, Returning Response: & amp; Response, Error: Zero)   
 You then have a conditionally a  NSHTTPURLResponse :  
  if httpResponse = feedback? NSHTTPURLResponse {println (httpResponse.expectedContentLength)}   
 Note that you should check the return value of  sendSynchronousRequest () , which is  zero  If no connection can be made.  
 This method is advised to call only for a different thread (or using the  sendAsynchronousRequest () ) because it may take some time to do one Connections especially when using a cellular network ??? And the main thread will be blocked otherwise.

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