POST通过Alamofire 5请求Firebase云消息传递时出现错误400

Question

我正在尝试重写工作功能以在Alatofire 5上发送通知，但遇到错误失败（Alamofire.AFError.responseValidationFailed（原因：Alamofire.AFError.ResponseValidationFailureReason.unacceptableStatusCode（代码：400）））

这是一个有效的功能：

php artisan key:generate --show

这是我尝试在Alamofire 5上重写它

func sendMessage(token: String) {
        let urlString = "https://fcm.googleapis.com/fcm/send"
        let url = NSURL(string: urlString)!
        let paramString: [String : Any] = ["to": token,
                                           "priority": "high",
                                           "notification": ["title": "test", "body": "test", "sound": "default", "badge": 1],
                                           "data": ["user": "test_id"]
        ]
        let request = NSMutableURLRequest(url: url as URL)
        request.httpMethod = "POST"
        request.httpBody = try? JSONSerialization.data(withJSONObject:paramString, options: [.prettyPrinted])
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.setValue("key=xxxxxxxxxxx", forHTTPHeaderField: "Authorization")
        let task =  URLSession.shared.dataTask(with: request as URLRequest)  { (data, response, error) in
            do {
                if let jsonData = data {
                    if let jsonDataDict  = try JSONSerialization.jsonObject(with: jsonData, options: JSONSerialization.ReadingOptions.allowFragments) as? [String: AnyObject] {
                        NSLog("Received data:\n\(jsonDataDict))")
                    }
                }
            } catch let err as NSError {
                print(err.debugDescription)
            }
        }
        task.resume()
    }

还要附加debugPrint输出：

func sendMessage(token: String) {
        let parameters: [String: Any] = [
            "to": token,
            "priority": "high",
            "notification": [
                "title": "test",
                "body": "test",
                "sound": "default",
                "badge": 1
            ],
            "data": [
                "user": "test_id"
            ]
        ]

        let headers: HTTPHeaders = [
            .contentType("application/json"),
            .authorization("key=xxxxxxxxxx")
        ]

        AF.request("https://fcm.googleapis.com/fcm/send", method: .post, parameters: parameters, headers: headers)
            .validate()
            .responseJSON { response in
                debugPrint(response)
        }
    }

我还注意到，如果我从标题中删除内容类型，则不会出现错误，但是不会出现通知。