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try {
    ...
} catch (Exception $e) {
    header('HTTP/1.1 500 Internal Server Error');
    header('Content-Type: application/json; charset=UTF-8');
    die(json_encode(array('message' => 'ERROR')));
}

if ($response) {
    header('HTTP/1.1 200 OK');
    header('Content-Type: application/json; charset=UTF-8');
    print json_encode(array('message' => 'OK'));
} else {
    header('HTTP/1.1 500 Internal Server Error');
    header('Content-Type: application/json; charset=UTF-8');
    die(json_encode(array('message' => 'ERROR')));
}