我正在开发一个flutter应用程序。我试图在开发过程中使用Firebase模拟器作为后端。
我配置了仿真器，当我使用"firebase emulators：start"命令时，我确认了以下响应。
仿真器主机：仿真器UI中的端口视图
身份验证0.0.0.0：9099| http://127.0.0.1:4000/auth
函数0.0.0.0：5001| http://127.0.0.1:4000/functions
文件名：|http://127.0.0.1:4000/firestore
存储器0.0.0.0：9199| http://127.0.0.1:4000/storage
因此，我编写了初始化Firebase设置的部分，如下所示。

Future initializeApp() async {
    await Firebase.initializeApp(
      options: DefaultFirebaseOptions.currentPlatform,
    );
    FirebaseAuth.instance.useAuthEmulator("0.0.0.0", 9099);
    FirebaseFunctions.instance.useFunctionsEmulator("0.0.0.0", 5001);
    FirebaseStorage.instance.bucket = 'default-bucket';
    FirebaseStorage.instance.useStorageEmulator("0.0.0.0", 9199);
    FirebaseFirestore.instance.useFirestoreEmulator("0.0.0.0", 8080);
    FirebaseFirestore.instance.settings = const Settings(
      host: "0.0.0.0",
      persistenceEnabled: false,
      sslEnabled: false,
    );
  }

我的firebase.json在下面

{
  "functions": {
    "predeploy": "npm --prefix \"$RESOURCE_DIR\" run build",
    "source": "functions"
  },
  "emulators": {
    "auth": {
      "host": "0.0.0.0",
      "port": 9099
    },
    "functions": {
      "host": "0.0.0.0",
      "port": 5001
    },
    "firestore": {
      "host": "0.0.0.0",
      "port": 8080
    },
    "storage": {
      "host": "0.0.0.0",
      "port": 9199
    },
    "ui": {
      "enabled": true
    }
  },
  "firestore": {
    "rules": "firestore.rules",
    "indexes": "firestore.indexes.json"
  },
  "storage": {
    "rules": "storage.rules"
  }
}

但当我尝试使用firestore时，它显示"未处理的异常：[cloud_firestore/unavailable]服务当前不可用。这很可能是暂时情况，可以通过回退重试来更正。"。
我想我已经把所有的设置都做好了。我想不出是哪一部分错了。希望帮助
下面是firestore-debug.log文件。

Nov 25, 2022 9:34:42 AM com.google.cloud.datastore.emulator.firestore.websocket.WebSocketServer start
INFO: Started WebSocket server on ws://0.0.0.0:9150
API endpoint: http://0.0.0.0:8080
If you are using a library that supports the FIRESTORE_EMULATOR_HOST environment variable, run:

   export FIRESTORE_EMULATOR_HOST=0.0.0.0:8080

Dev App Server is now running.

Nov 25, 2022 9:34:44 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFO: Detected non-HTTP/2 connection.
Nov 25, 2022 9:34:45 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFO: Detected non-HTTP/2 connection.
Nov 25, 2022 9:34:48 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFO: Detected non-HTTP/2 connection.
Nov 25, 2022 9:34:48 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFO: Detected HTTP/2 connection.
Nov 25, 2022 9:35:46 AM com.google.cloud.datastore.emulator.firestore.websocket.WebSocketChannelHandler initChannel
INFO: Connected to new websocket client
Nov 25, 2022 9:35:46 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFO: Detected non-HTTP/2 connection.
Nov 25, 2022 9:36:46 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFO: Detected non-HTTP/2 connection.
*** shutting down gRPC server since JVM is shutting down
*** server shut down

奇怪的是，Auth Emulator工作得很好。