Unable to retrieve full http headers for a page

I am trying to get some stock information from a suppliers page, using a http request. I tried this using cUrl (it works with most sites) but with this one I get an asp.net error (that is hidden to me) - if I try viewing the headers for the site using LiveHTTPHeaders (firefox plugin) - It retrieves only some basic header information. I'm wondering what the problem is. This is the site www.toolbank.com The code I'm using is php

if(!function_exists("curl_init")开发者_运维问答)
    die("cURL extension is not installed");

$ch = curl_init("http://www.toolbank.com/");  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
$r = curl_exec($ch);  
curl_close($ch);  

echo $r; 

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Add curl_setopt($ch, CURLOPT_HEADER, true);.