Timeout caused potentially by curl_setopt | PHP - php

Question

Essentially the following script is working fine when in local host but fails to load (Timeout) anytime loaded from a web server, is their something incorrectly written? I know it's not the end point api url that's the issue, since it works on local. Please see below, wondering if it's caused by curl_setopt:
$id = "dhl";
$number = "039103913";
// Parameters setting
$key = 'key';
$secret = 'scret';
$param = array (
'id' => $id,
'number' => $number,
'phone' => '',
'ship_from' => '',
'ship_to' => '',
'area_show' => 1,
'order' => 'desc'
);
// Request Json
$json = json_encode($param, JSON_UNESCAPED_UNICODE);
$signature = strtoupper(md5($json.$key.$secret));
$url = 'https://www.kd100.com/api/v1/tracking/realtime';
$headers = array (
'Content-Type:application/json',
'API-Key:'.$key,
'signature:'.$signature,
'Content-Length:'.strlen($json)
);
// Send post request
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $json);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
$result = curl_exec($ch);
$data = json_decode($result, true);
echo json_encode($data);