@everyone. Thanks for your tips.
Finally, my code works with following configuration almost time.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$linkCheck);
curl_setopt($ch, CURLOPT_PROXY, $proxy);
curl_setopt($ch, CURLOPT_PROXYUSERPWD, $proxyauth);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, true);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT,$fetchTimeout);
curl_setopt($ch, CURLOPT_TIMEOUT, $fetchTimeout);
Btw, I've got another issue. When the url includes odd characters like accent sign(/clasificación), then it doesn't work with fatal error.
When I use /clasificaci%C3%B3n instead of above, then it works again. So, here is my question. How can I change odd string, so it will be made valid url.
Thanks a lot.