Constant Contact API, Adding a new contact - api

Question

I am trying to add a new email subscriber as a contact to my contact list. But i am getting a 404 error. Following is my code. Can anybody help?
$userNamePassword = $Key . '%' . $UN . ':' . $PW ;
$entry = '<entry xmlns="http://www.w3.org/2005/Atom">
<id>http://api.constantcontact.com/ws/customers/'.$UN.'/contacts/'.$SubID.'</id>
<title type="text">Contact: '.$email.'</title>
<updated>2008-04-25T19:29:06.096Z</updated>
<author></author>
<content type="application/vnd.ctct+xml">
<Contact xmlns="http://ws.constantcontact.com/ns/1.0/" id="http://api.constantcontact.com/ws/customers/'.$UN.'/contacts/'.$SubID.'">
<EmailAddress>'.$email.'</EmailAddress>
<OptInSource>ACTION_BY_CUSTOMER</OptInSource>
<ContactLists>
<ContactList id="http://api.constantcontact.com/ws/customers/'.$UN.'/lists/0">
</ContactLists>
</Contact>
</content>
</entry>';
$tmpfile = tmpfile();
fwrite($tmpfile, $entry);
fseek($tmpfile, 0);
// Initialize the curl session
$request ="https://api.constantcontact.com/ws/customers/".$UN."/contacts/".$SubID;
$session = curl_init($request);
// Set up Digest authentication. Put your API key, and CTCT username/pwd here
$userNamePassword = $Key . '%' . $UN . ':' . $PW ;
curl_setopt($session, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($session, CURLOPT_USERPWD, $userNamePassword);
curl_setopt($session, CURLOPT_INFILE, $tmpfile);
fclose($tmpfile); // Close temp file because it no longer needed
curl_setopt($session, CURLOPT_PUT, 1);
curl_setopt($session, CURLOPT_INFILESIZE, strlen($entry));
curl_setopt($session, CURLOPT_HTTPHEADER, Array("Content-Type:application/atom+xml"));
curl_setopt($session, CURLOPT_HEADER, false); // Do not return headers
curl_setopt($session, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($session, CURLOPT_SSL_VERIFYPEER, 0);
$response = curl_exec($session);
$httpcode = curl_getinfo($session, CURLINFO_HTTP_CODE);
curl_close($session);
echo("httpcode error is ".$httpcode);
if ($httpcode > 199 && $httpcode < 300){
return 'Success';
}else{
return 'False';
}

Answer 1

Ok, I am able to resolve the issue by making it post. i.e, replaced the following code
curl_setopt($session, CURLOPT_PUT, 1);
with the following codes
curl_setopt($session, CURLOPT_POST, 1);
curl_setopt($session, CURLOPT_POSTFIELDS, $entry);