Laravel Server Sent Events

gistfile1.txt

use Symfony\Component\HttpFoundation\StreamedResponse;

$response = new StreamedResponse(function() use ($request, $data) {
            while (true) {
                echo 'data: ' . json_encode(['data' => $data]) . "\n\n";
                ob_flush();
                flush();
                usleep(10000000);
            }
        });
        $response->headers->set('Content-Type', 'text/event-stream');
        $response->headers->set('X-Accel-Buffering', 'no');
        $response->headers->set('Cach-Control', 'no-cache');
        return $response;
        
In JS,

if (!!window.EventSource) {
                    var req_url = "{{route('ajax.booking_alerts')}}";
                    var source = new EventSource(req_url);
                    source.addEventListener("message", function(e) {
                    alerts_last_check = e.data.alerts_last_check;
                            console.log(e.data);
                    }, false);
                    source.addEventListener("open", function(e) {
                    console.log("Connection was opened.");
                            }, false);
                    source.addEventListener("error", function(e) {
                    console.log("Error - connection was lost.");
                            }, false);
            } else {
            alert("Your browser does not support Server-sent events! Please upgrade it!");
            }