404 Error when Testing Request class validation through Chrome Postman Extension - laravel

Question

Below is my Controller Action method. You can see I passed a param of Request Class to validate before going to save the data in database
public function store(RoleRequest $request)
{
}
My Request class is below.
class RoleRequest extends Request
{
private $Role;
public function __construct(IRole $_role) {
$this->Role = $_role;
}
public function authorize()
{
return true;
}
public function rules()
{
return [
'Role' => 'required|max:20|min:4,
];
}
}
Above code works perfectly when I run it through web page(blade).
I created one more controller for API to Send save request. Below is the code
class RoleApiController extends Controller
{
public function store(RoleRequest $request)
{
}
}
Issue comes, when I type just 1 char for role name and the Request class impose validation and I get 404 error This time I am sending request from Postman Extension in Chrome.
Error Details

Answer 1

The Validation Request class checks if your request is an ajax request or a normal request.
If it's a normal request it does: redirect()->back() with the validation messages in the session.
If it's an ajax request it shows a json object with the validation messages in it.
Frontend frameworks/libraries like for example jQuery add a header to an ajax request to let the backend know it's an ajax request. Laravel checks this header to decide what to do (using the isAjax or wantsJson methods).
Postman does not automatically send this header. So you should add one of the following headers manually:
Accept: application/json
X-Requested-With: XMLHttpRequest
Here is a screenshot of postman as an example: