webconnector for ajax requests in frontend

webconnector.php

<?php

require_once dirname(dirname(dirname(dirname(__FILE__)))) . '/config.core.php';
require_once MODX_CORE_PATH . 'model/modx/modx.class.php';
$modx = new modX();
$modx->initialize('web');
$modx->getService('error', 'error.modError', '', '');

$path = MODX_CORE_PATH.'components/ajax/processors/web/';

$response = $modx->runProcessor($_REQUEST['action'], $_REQUEST, array(
    'processors_path' => $path
));

$json = $modx->toJSON($response->response);

echo $json;

@session_write_close();

exit;