在 Flutter 是否可以在 firebase Messaging BackgroundHandler 中调用 API 请求？

Question

i have implemented chat message app in which user can reply to chat from push notification when app is killed/background/foreground.

Future firebaseMessagingBackgroundHandler(RemoteMessage message) async { await GetStorage.init(); await Firebase.initializeApp( options: DefaultFirebaseOptions.currentPlatform); //Call HTTP request sendNotification( personUid, title, body, notificationTypeId, chatRoomId, userTokenDummy, userToken, serverKey, currentUserId, currentUserToken, ); }

//Here is a code for API request

  sendNotification({
    required String personUid,
    required String title,
    required String body,
    required int notificationTypeId,
    String? chatRoomId,
    String? userTokenDummy,
    String? userToken,
    String? serverKey,
    String? currentUserId,
    String? currentUserToken,
  }) async {
    try {
      final response = await http.post(
        Uri.parse('https://fcm.googleapis.com/fcm/send'),
        headers: <String, String>{
          HttpHeaders.contentTypeHeader: 
  'application/json',
          HttpHeaders.authorizationHeader: 'key=$serverKey'
        },
        body: jsonEncode(
          <String, dynamic>{
            "data": <String, dynamic>{
              "title": title,
              "body": body,
              "click_action": "FLUTTER_NOTIFICATION_CLICK",
              "id": "1",
              "status": "done",
              "senderId": currentUserId,
              "senderToken": currentUserToken,
              "notificationTypeId": notificationTypeId,
              "chatRoomId": chatRoomId,
            },
            "android": {
              "priority": "high",
            },
            "apns": {
              "headers": {"apns-priority": "10"}
            },
            "to": userToken,
            "content_available": true,
            "mutable-content": 1,
            "priority": "high",
          },
        ),
      );

      return response;
    } catch (e) {
      console(e.toString());
    }
  }

Answer 1

Yes,you can call Http request inside firebaseMessagingBackgroundHandler. But make sure that this api is not taking too much time. Because long and intensive tasks impacts on device performance. Also make sure that there is not exception or error in the api which causes the device to freeze.

To make sure that api is not running forever place a timeout in http class.

for more refer to firebase documentation: https://firebase.google.com/docs/cloud-messaging/flutter/receive