如何修复PHP发送推送通知错误HTTP错误500

Question

我想从应用程序发送推送通知，我可以从Firebase Cloud消息传递中获取令牌。我可以在Appserv中使用代码，但我不能从服务器在线使用，服务器在线错误HTTP错误500这是我的代码

 <?php 
    function send_notification ($tokens, $message)
    {
        $url = 'https://fcm.googleapis.com/fcm/send';
        $fields = array(
             'registration_ids' => $tokens,
             'data' => $message
            );
        $headers = array(
            'Authorization:key = key ',
            '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, false);
       curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
       $result = curl_exec($ch);           
       if ($result === FALSE) {
           die('Curl failed: ' . curl_error($ch));
       }
       curl_close($ch);
       return $result;
    }
    $conn = mysqli_connect("localhost","user","pass","db");
    $User_id = $_POST['User_id'];
    $sql = "SELECT * FROM user_token";
    $result = mysqli_query($conn,$sql);
    $tokens = array();
    if(mysqli_num_rows($result) > 0 ){
        while ($row = mysqli_fetch_assoc($result)) {
            $tokens[] = $row["Token"];
        }
    }
    mysqli_close($conn);
    $message = array("message" => " SendNotification Txt");
    $message_status = send_notification($tokens, $message);
    echo $message_status;
    ?>

Answer 1

错误 500 表示Internal Server Error。您遇到此处提到的问题，或者问题是 FCM，在这种情况下，您必须(根据文档(：

500-599 范围内的错误(例如 500 或 503(表示 FCM 连接服务器在尝试处理请求时出现内部错误，或者服务器暂时不可用(例如，由于超时(。发件人必须稍后重试，并遵循响应中包含的任何 Retry-After 标头。应用程序服务器必须实现指数退避。