completionHandler: (response: Response<User, NSError>) -> Void
    )

    -> Void {
        Alamofire.request(.GET, url,
            parameters: ["username": username,"im_pwd":username])
            .responseObject(completionHandler)
}

func login(
    username :String,
    password : String,

    completionHandler: (response: Response<User, NSError>) -> Void
    )

    -> Void {
        Alamofire.request(.GET, url,
            parameters: ["username": username,"im_pwd":username])
            .responseObject{
                (response: Response<User, NSError>) in
                completionHandler(response: response)

        }
}