php curl 获取信息不完整

$ch = curl_init();            curl_setopt ($ch, CURLOPT_URL, $url);           curl_setopt ($ch, CURLOPT_COOKIEJAR, "c:\cookie.txt");       curl_setopt ($ch, CURLOPT_HEADER, 1);       curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);       curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);	   curl_setopt($ch, CURLOPT_HTTPHEADER, array('Expect:'));       curl_setopt ($ch, CURLOPT_TIMEOUT, 120);       $result = curl_exec ($ch);       curl_close($ch);     echo $result;