curl_setopt只返回一些响应

I am sending a request to our server and when it returns, it only has about 25% of the information that I get when I paste the same URL into my web browser. The data in the full version is about 4500 lines at 550KB. Here is the script :

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $q);
curl_setopt($ch,CURLOPT_HTTPHEADER,array('User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:19.0) Gecko/20100101 Firefox/19.0'));
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT ,0); 
curl_setopt ($ch, CURLOPT_COOKIEJAR, $ckfile);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, true);
$return = curl_exec($ch);
curl_close($ch);

echo "The return is : " . $return;

How can I all of the data?