Why is redirect() not returning a page?

Question

Laravel

Laravel 5.7
In a controller, when an error is received from the API, it must be returned to the page.
redirect() works but doesn't render the page. Just a white screen.

if ($result['error']) {
            if (strpos($result['error_description'], 'Task not found')) {
                // echo "Неверно введен номер задачи";
                return redirect()->route('home');
                // die;
            }
        }

return view('welcome');
does the same
here is the code of the whole function

private function getTask($request)
    {
        $number = intval($request->number);

        $queryUrl = 'https://'.HomeController::DOMAIN.'.bitrix24.ru/rest/71/000000000000/task.item.getdata.json';
        $queryData = http_build_query(array(
            'TASKID' => $number
        ));

        $curl = curl_init();
        curl_setopt_array($curl, array(
            CURLOPT_SSL_VERIFYPEER => 0,
            CURLOPT_POST => 1,
            CURLOPT_HEADER => 0,
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_URL => $queryUrl,
            CURLOPT_POSTFIELDS => $queryData,
        ));

        $result = curl_exec($curl);
        curl_close($curl);

        $result = json_decode($result, 1);

        if ($result['error']) {
            if (strpos($result['error_description'], 'Task not found')) {
                echo "Неверно введен номер задачи";
                return view('welcome');
                // die;
            }
        }

        dd($result);
    }

This function is called from another function, which, in turn, is called when Submit is clicked on the form.
If instead of calling this function I do redirect or return view, then everything works fine