Büyük ihtimalle header bilgileri eklerseniz sorun düzelecektir.

Bana bu konuda bu sayfa baya fayda sağladı. Fonksiyon ile yazılmış kodu kendinize göre düzenleyip deneyebilirsiniz.
https://stackoverflow.com/questions/8115683/php-curl-custom-headers

Fonksiyon

/**
*
* @param string $url
* @param string|array $post_fields
* @param array $headers
* @return type
*/
function cUrlGetData($url, $post_fields = null, $headers = null) {
$ch = curl_init();
$timeout = 5;
curl_setopt($ch, CURLOPT_URL, $url);
if ($post_fields && !empty($post_fields)) {
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
}
if ($headers && !empty($headers)) {
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
}
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$data = curl_exec($ch);
if (curl_errno($ch)) {
echo 'Error:' . curl_error($ch);
}
curl_close($ch);
return $data;
}


Kullanım örneği:

$url = "http://www.myurl.com";
$post_fields = 'postvars=val1&postvars2=val2';
$headers = ['Content-Type' => 'application/x-www-form-urlencoded', 'charset' => 'utf-8'];
$dat = cUrlGetData($url, $post_fields, $headers);


Fonksiyonla uğraşmak istemezsen bunu da deneyebilirsin:

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"http://www.example.com/process.php");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,$vars); //Post Fields
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$headers = [
'X-Apple-Tz: 0',
'X-Apple-Store-Front: 143444,12',
'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
'Accept-Encoding: gzip, deflate',
'Accept-Language: en-US,en;q=0.5',
'Cache-Control: no-cache',
'Content-Type: application/x-www-form-urlencoded; charset=utf-8',
'Host:www.example.com ',
'Referer: http://www.example.com/index.php ', //Your referrer address
'User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:28.0) Gecko/20100101 Firefox/28.0',
'X-MicrosoftAjax: Delta=true'
];

curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

$server_output = curl_exec ($ch);

curl_close ($ch);

print $server_output ;