func callPostApi()
{
    let baseUrl : NSString = NSString(format: "YOUR_BASE_URL")   //"http://at.webby.com/php.api"
    let request = NSMutableURLRequest(URL: NSURL(string: baseUrl as String)!)
    let session = NSURLSession.sharedSession()

    request.HTTPMethod = "POST"
    let stringPost = "username=test&password=12345" // Key and Value param as string

    let data = stringPost.dataUsingEncoding(NSUTF8StringEncoding)

    request.timeoutInterval = 60
    request.HTTPBody=data

    let task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in

        let err1: NSError? = nil
        do
        {
            let json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers)
            print(json)
        }
        catch
        {
            print(err1)
        }
    })

    task.resume()
}