php – GCM卷曲操作超时

Curl error: Operation timed out after 0 milliseconds with 0 out of 0
bytes received

这是服务器的问题还是我的GCM代码有问题？下面是我的php文件：

<?php

$message = urldecode($_POST['message']);
$order = urldecode($_POST['order']);
$registrationIDs = urldecode($_POST['registrationIDs']);
$apiKey = "API_KEY";
$tableID = urldecode($_POST['tableID']);

$url = 'https://android.googleapis.com/gcm/send';

$fields = array(
    'registration_ids' => array($registrationIDs),'data' => array(
        'message' => $message,'tableID' => $tableID,'order' => $order
    ),);

$headers = array(
    'Authorization: key=' . $apiKey,'Content-Type: application/json'
);

// Open connection
$ch = curl_init();

// Set the url,number of POST vars,POST data
curl_setopt($ch,CURLOPT_URL,$url);

curl_setopt($ch,CURLOPT_POST,true);
curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,CURLOPT_SSL_VERIFYPEER,false);

curl_setopt($ch,CURLOPT_POSTFIELDS,json_encode($fields));



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

// Close connection
curl_close($ch);

echo $result;

?>