curl 통신관련 오류 도움을 원합니다.

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL,$url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

curl_setopt($ch, CURLOPT_HEADER, 0);

//curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-type:application/json'));

curl_setopt($ch, CURLOPT_POST, 1);

curl_setopt($ch, CURLOPT_POSTFIELDS,$postfields);

$data = curl_exec($ch); 

살행결과 CURL Error(18) transfer closed with 18 bytes remaining to read 

메세지가 나타나고 정상적인 처리가 안됩니다.