Flutter - HTTP响应窗口身份验证

Question

I'm new in flutter.

I created an application that parse .JSON format from .php body using http.get()/http.post().

everything is working normally when using the local database and local Apache server on my laptop.

the problem stared when I applied this project using windows server(domain) as database server and apache server, my flutter apps does't working anymore.

When I tried to access the .php file (checkConnection.php) using my browser on my laptop/android phone it is showing a popup that asking an windows authentication.

Windows Auth Screenshoot

checkConnection.php was working when i input my domain account.

THE QUESTION.

Does anyone know an alternative way to solve this issue? maybe something like saving my credentials on the code?

This is the code that I used on my flutter application:

final response =
    await http.post("http://172.28.16.84/mobileglpi/login.php", body: {

  'username': txt_username.text,
  'password': txt_password.text,
});
var datauser = json.decode(response.body);