Curl request is failing

I have this code:

$ch = curl_init();  
curl_setopt($ch, CURLOPT_URL, "http://www.infoempleo.com/");  
curl_setopt($ch, CURLOPT_POST, false);  
//curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6");
curl_setopt($ch, CURLOPT_COOKIEJAR,$cookie );  
curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie);
curl_setopt($ch, CURLOPT_HTTPGET ,true);  
curl_setopt($ch, CURLOPT_HEADER, false);  
curl_setopt($ch,CURLOPT_HTTPHEADER,ar开发者_如何学Cray('HeaderName: HeaderValue'));
  //  curl_setopt($ch,CURLOPT_TIMEOUT,10); 
curl_setopt($ch, CURLOPT_REFERER, '');  
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);  
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);  
$homepage = curl_exec($ch);
var_dump($homepage);

But is is not working, it is working with google.com but not with http://www.infoempleo.com/. What is wrong in this code?

I tried online ping utility like http://network-tools.com/ and the server is not responding to ping request, but they are responding to http headers. so what do I need to set in the cURL request to make it work ?

But this code works

$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url );

curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6");

curl_setopt ($ch, CURLOPT_TIMEOUT, 60);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt ($ch, CURLOPT_COOKIEJAR, $cookie);
curl_setopt ($ch, CURLOPT_REFERER, $url . "blog/wordpress/wp-login.php");

curl_setopt ($ch, CURLOPT_POSTFIELDS, $postdata);
curl_setopt ($ch, CURLOPT_POST, 1);
$result = curl_exec ($ch);

how ?

It may restrict user agents. Try to change

//curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6");

with

curl_setopt ($ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6");