my api.php

<?php

use IlluminateHttpRequest;
use IlluminateSupportFacadesRoute;

use AppHttpControllersUserController;

Route::middleware('auth:api')->get('/user',function (Request $request)
{
    return $request->user();
});

Route::post('register',[UserController::class,'register']);

my UserController.php is bellow

<?php

namespace AppHttpControllers;

use AppHttpControllersController;
use IlluminateHttpRequest;

class UserController extends Controller
{
    //
    function register(Request $req)
    {
        return "Hellooooo";
        //return $req->input();
    }
}

my problem is
http://localhost:8000/api/register
above url is not displaying “Hellooo” in POSTMAN (i use post method)

can someone please help