Help! Having trouble getting one XML field from this feed reliably

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Can anyone tell me what I'm doing wrong here?  I'm trying to get the VASTAdTagURI field from the XML data at this url:

http://afe.specificclick.net/?l=32259&t=x&rnd=123456




Here's my code.  (below).  It works maybe 30% of the time, but most of the time it just returns nothing from that field.  Yet when I go to the above url in Firefox, I always see the data.  This is very strange.





// Lets get the ad!

$curl_handle=curl_init();
curl_setopt($curl_handle,CURLOPT_URL,'http://afe.specificclick.net/?l=32259&t=x&rnd=123456');
curl_setopt($curl_handle,CURLOPT_CONNECTTIMEOUT,2);
curl_setopt($curl_handle,CURLOPT_RETURNTRANSFER,1);
$buffer = curl_exec($curl_handle);
curl_close($curl_handle);

$vastdata = new SimpleXMLElement($buffer);

$vasturi = $vastdata->Ad->Wrapper->VASTAdTagURI;

echo "If the script works, vasturi = " . $vasturi;

echo "<br><br><br>";

print_r($vastdata);







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