What are these php Curl response headers indicative of? -

i trying use curl communicate api of server:

  $ch = curl_init();    curl_setopt($ch, curlopt_url, 'pilot-payflowpro.paypal.com');   curl_setopt($ch, curlopt_httpheader, $headers);   curl_setopt($ch, curlopt_useragent, $user_agent);   curl_setopt($ch, curlopt_header, 1); // tells curl include headers in response   curl_setopt($ch, curlopt_returntransfer, 1); // return variable   curl_setopt($ch, curlopt_timeout, 45); // times out after 45 secs   curl_setopt($ch, curlopt_followlocation, 0);   curl_setopt($ch, curlopt_ssl_verifypeer, 0); // line makes work under https   curl_setopt($ch, curlopt_postfields, $plist); //adding post data   curl_setopt($ch, curlopt_ssl_verifyhost,  2); //verifies ssl certificate   curl_setopt($ch, curlopt_forbid_reuse, true); //forces closure of connection when done    curl_setopt($ch, curlopt_post, 1); //data sent post     $result = curl_exec($ch);   $headers = curl_getinfo($ch);   print_r($headers); 

however, $result variable empty, returntransfer set 1, means no response given. printing out headers gives:

( [url] => http://pilot-payflowpro.paypal.com [content_type] => [http_code] => 0  [header_size] => 0 [request_size] => 0 [filetime] => -1 [ssl_verify_result] => 0  [redirect_count] => 0 [total_time] => 1.656 [namelookup_time] => 0.062 [connect_time] => 0  [pretransfer_time] => 0 [size_upload] => 0 [size_download] => 0 [speed_download] => 0  [speed_upload] => 0 [download_content_length] => -1 [upload_content_length] => -1  [starttransfer_time] => 0 [redirect_time] => 0 [certinfo] => array ( ) )  

what suggest in terms of debugging? using wamp on local desktop curl enabled.

thanks.

seems curlopt_url param wrong... try filled url (http://pilot-payflowpro.paypal.com)

in example, curl doesn't know protocol use (http, https)

edit : try https://pilot-payflowpro.paypal.com since server mention doesn't respond on http protocol