What should be returned when calling the service with the OPTIONS method?

Question

PHP

I read articles that you need to return methods supported by the service.
The method will work on a POST request.
By default, I plan to return that the method is not supported.
But what and in what form to return with the OPTIONS method?

switch ($_SERVER['REQUEST_METHOD']) {
      case 'OPTIONS': break;
      case 'POST': break;
      default: break;
    }

Answer 1

You can return anything.
You can even come up with your own method and also return something.
But the browser uses it to check cors headers , and it is advisable not to send anything else except for them