谷歌GCM服务器返回未授权错误401。

我正在使用GCM服务从服务器推送信息。如果我使用浏览器密钥，则显示成功消息为：{"multicast_id":4849013215736515938,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1348742583011905%2adac3a0f9fd7ecd"}]}，但是设备上没有收到任何通知。 如果我使用服务器密钥，则显示未授权错误401。我的代码如下：

$apiKey = "xxxxx";
$registrationIDs = array("xxxxxxxx");
$message = "testing Process";
$url = 'https://android.googleapis.com/gcm/send';
$fields = array(
        'registration_ids'  => $registrationIDs,
        'data'              => array("message"=>$message),
        );
$headers = array( 
        'Authorization: key=' . $apiKey,
        'Content-Type: application/json'
        );
$ch = curl_init();
curl_setopt( $ch, CURLOPT_URL, $url );
curl_setopt( $ch, CURLOPT_POST, true );
curl_setopt( $ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0); 
curl_setopt( $ch, CURLOPT_POSTFIELDS, json_encode($fields) );

$result = curl_exec($ch);
if(curl_errno($ch)){ echo 'Curl error: ' . curl_error($ch); }
curl_close($ch);
echo $result;

请帮我解决这个问题。谢谢您提前。