Как получить ответ через POST используя CURL?

ini_set('error_reporting', E_ALL);
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
define('DIR', __DIR__);
 
$user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : 'Traider';
$cookie = dirname(__FILE__).DIRECTORY_SEPARATOR.'init_cookie.txt';
$f = fopen('init_deb.txt', 'w');
$ch = curl_init();
 
$getUrl = 'https://www.investing.com/holiday-calendar/';
$postUrl = 'https://www.investing.com/holiday-calendar/Service/getCalendarFilteredData';
 
$dateFrom='2017-01-14';
$dateTo='2017-12-31';
$limit_from = 0;
$params = [
    'dateFrom' => $dateFrom,
    'dateTo' => $dateTo,
    'county' => '',
    'limit_from' => $limit_from
];
 
curl_setopt($ch, CURLOPT_URL, $postUrl);
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie);
curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie);
curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLOPT_STDERR, $f);
 
$response = curl_exec($ch);
fclose($f);
curl_close($ch);
 
echo $response;