func doLogin(){
    print("entered doLogin")
    let myUrl: String = "https://url.com/names?login"
    guard let url = URL(string: myUrl.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!)else {
        print("Error: cannot create URL")
        return
    }
    var request = URLRequest.init(url: url)
    request.httpMethod = "POST"

    let params = ["Username":String(describing: self.username), "Password":String(describing: self.password)]
    request.httpBody = try? JSONSerialization.data(withJSONObject: params, options: [])
    request.addValue("application/json", forHTTPHeaderField: "Content-Type")

    //URLSession.shared.dataTask(with: request) { (data:Data?, response:URLResponse?, error:Error?) in
    //  if let safeData = data{
    //      print("response: (String(data:safeData, encoding:.utf8))")
    //  }
    //}

    //let postString = "Username=(String(describing: self.username))&Password=(String(describing: self.password))"
    //request.httpBody = postString.data(using:String.Encoding.utf8)
    request.timeoutInterval = 30.0

    //print(request)

    let configuration = URLSessionConfiguration.default
    let session = URLSession(configuration : configuration)
    //let session = URLSession(configuration: configuration, delegate: self as! URLSessionDelegate, delegateQueue: nil)

    let task = session.dataTask(with: request) {
        (data : Data?, response:URLResponse?, error) in
        // check for any errors
        guard error == nil else {
            print("error calling POST on url")
            print(error!)
            return
        }
        // make sure we got data
        guard let responseData = data else {
            print("Error: did not receive data")

            return
        }

        do {
            print ("responseData:")
            print(responseData)
        }
    }
    //print ("response:")
    //print(task.response)
    task.resume()