//creating the post parameter by concatenating the keys and values from text field
        let getParameters = "username=\(textFieldUser!.text!)&password=\(textFieldPass!.text!)&connect=ok"

        print("username=\(textFieldUser!.text!)&password=\(textFieldPass!.text!)&connect=ok")

        let request: MyCustomRequest = MyCustomRequest(url: "URL/login.php", paramsStr: getParameters)

        let session = URLSession.shared

        let task = session.dataTask(with: request.request! as URLRequest)
{
            data, response, error in
            print("\(String(data: data!, encoding: String.Encoding.utf8)!)")
            // instructions executees apres la reponse
            // c'est ici et slt ici que la reponse peut etre utilisee

        DispatchQueue.main.async
    {
          self.loginUser = self.connectUser.text!
          print(self.loginUser)
          self.performSegue(withIdentifier: "login", sender: nil)

    }

}

        task.resume() // lancement de la tache