trouble to send request in postman in laravel api.php post method

Question

I write a simple post method Route in api.php and postman errored

I also add put Accept = Application/json in headers and return a value to a

but postman do not work

this is postman error

postman image issue

and this is my api.php

Route::post('/p', function (Request $request) {
    $a = $request->a;
    return response(a,200);
});

Thanks

Answer 1

Route::post('/p', function (Request $request) {
    $a = $request->a;
    return response($a, 200);
});

You missed the '$' in response($a, 200)