Flutter + Laravel : can't register new user on server - laravel

Question

I have flutter app with this register request :
var url = 'xxxxxxx/api/v1/';
// register-----------------
registerToApp(password, username, email, context) async {
var newurl = Uri.parse(url + 'register');
var data = {
'password': password,
'username': username,
'email': email,
};
if (username == '' || password == '' || email == '') {
showSnackBar(context, 'Username and Password and Email must be fill');
} else {
try {
var response = await http.post(newurl, body: data);
var result = jsonDecode(response.body);
Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
final SharedPreferences prefs = await _prefs;
prefs.setString('username', result['username']);
prefs.setString('token', result['token']);
showSnackBar(context, result['status']);
return result;
} catch (e) {
print(e);
}
}
}
when I tested it on local server it success but after I upload the same api to server I get this error on VsCode :
<script>document.cookie = "humans_21909=1"; document.location.reload(true)
I tested the api on postman on localhost it is succes too on server I get error 409 conflict.
the api created by Lumen :
public function register(Request $request)
{
$id=CreateRandomId::get_id('users');
$password = password_hash($request->password, PASSWORD_DEFAULT);
$users_count= User::where('username',$request->username)->get();
$email_count= User::where('email',$request->email)->get();
$credentials = request(['username', 'password']);
if(count($users_count)>0){
$data = [
'status' => 'username found',
];
}
else {
if (count($email_count)>0){
$data = [
'status' => 'email is found',
];
}
else {
$user = User::create(
[
'id'=>$id,
'username'=>$request->username,
'password'=>$password,
'email'=>$request->email,
'role'=>'user'
]);
if($user){
$credentials = request(['username', 'password']);
if (! $token = auth()->attempt($credentials)) {
return response()->json(['error' => 'Unauthorized'], 401);
}
else{
$data = [
'username'=>$request->username,
'password'=>$password,
'email'=>$request->email,
'status' => 'success',
'token' => $token
];}
}
else{
$data = [
'status' => 'failed',
];
}
}
}
return $data;
}
I copied same controller and router to server ,but don't work, what can I do ?
the route is :
$router->group(['prefix'=>'/api/v1'],function () use ($router) {
$router->get('/',function (){
return "welcome";
});
$router->group(['prefix'=>'/'],function () use ($router) {
$router->post('/register','AuthController#register');
$router->post('/login','AuthController#login');