Make a request to API

request.swift

    // make a request
    
    func getListData(parameters : [String:AnyObject], callback: ([NSObject:AnyObject], String?) -> Void) {
        
        var urlService : String!
        var parametersInfo : String!
        
        urlService = "\(urlMain)"
        parametersInfo = setFormDataFromDictionary(parameters)

        
        let url = NSURL(string: urlService)
        let urlRequest = NSMutableURLRequest(URL: url!, cachePolicy: .UseProtocolCachePolicy, timeoutInterval: 30.0)
        urlRequest.HTTPMethod = "POST"
        urlRequest.addValue(self.token, forHTTPHeaderField: "Authorization")
        
        
        let requesData:NSData = parametersInfo.dataUsingEncoding(NSUTF8StringEncoding)!
        urlRequest.addValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
        urlRequest.addValue("\(requesData.length)", forHTTPHeaderField: "Content-Length")
        urlRequest.HTTPBody = requesData
        
        let session: NSURLSession = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration(), delegate: nil, delegateQueue: NSOperationQueue.mainQueue())
        let task = session.dataTaskWithRequest(urlRequest) { (data, reponse, error) -> Void in
            if error != nil {
                //callback("", error?.localizedDescription)
                print("Error \(error)")
            }else{
                var directionsJson: [NSObject: AnyObject]!
                do{
                    directionsJson = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! [NSObject:AnyObject]
                } catch {
                    print(error)
                }
                callback(directionsJson, nil)
            }
        }
        task.resume()
        
    }
    
    // exec func
    self.getListData(parameters) { json in
      print(json)
    }