ab377bd50b179a39e16e7129a46f77cd *kdtu99-08-15d4t01.shn e76a0c1c203fbdb62882193c7e55b119 *kdtu99-08-15d4t02.shn 6605bafe91d7e5f9298173a0f33d0999 *kdtu99-08-15d4t03.shn App\Http\Controllers\Api\ChecksumDownloadController::download(): Return value must be of type string, none returned