HttpFoundation Component

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Open Ajax Modal Dialog from Controller

Dialogs are often called dialog boxes, modal windows, or pop-up windows. 
Whatever you call them, they are a quick and easy way to display additional information without reloading the entire page. 
Dialog boxes can display just some static text, any node or form of your page, a views page, or any custom markup you'll feed them. 

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        public function requestResidenceUpload(Request $request): AjaxResponse {
            $arg = $request->get('arg1');
            
            // Add an AJAX command to open a modal dialog with the form as the content.      
            $response = new AjaxResponse();
            $modal_form = $this->formBuilder->getForm('Drupal\mymodule\Form\MyForm', $arg);
            $response->addCommand(new OpenModalDialogCommand('Upload', $modal_form, ['width' => 600, 'height'=>600]) );
            return $response;        
        }

ResourceResponse When and How

class ResourceResponse
Contains data for serialization before sending the response.
We do not want to abuse the $content property on the Response class to store our response data. 
$content implies that the provided data must either be a string or an object with a __toString() method, which is not a requirement for data used here.
Routes that return this response must specify the '_format' requirement.

$response = ['message' => 'Hello, this is a rest service'];
return new ResourceResponse($response);
use Symfony\Component\HttpFoundation\Response;

$response = new Response(
    'Content',
    Response::HTTP_OK,
    ['content-type' => 'text/html']
);

$response->setContent('Hello World');

// the headers public attribute is a ResponseHeaderBag
$response->headers->set('Content-Type', 'text/plain');

$response->setStatusCode(Response::HTTP_NOT_FOUND);
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