Stream and Download Files Efficiently in Laravel Controllers

use Illuminate\Support\Facades\Storage;

// Download local file directly
public function downloadContract()
{
    return response()->download(storage_path('app/contract.pdf'), 'Agreement.pdf');
}

// Stream generated content without storing to disk
public function exportCsv()
{
    return response()->streamDownload(function () {
        echo "id,name\n1,John";
    }, 'users.csv');
}

// Display file inline in browser (e.g. PDF preview)
public function previewInvoice()
{
    return response()->file(storage_path('app/invoice.pdf'));
}