I am trying to add a Firebase function that verify the id token given by a http request to verify user before letting him access my distant database.
I tried something using documentation in Node.js

Here is my code :

const { initializeApp } = require('firebase-admin/app');
var admin = require("firebase-admin");
var serviceAccount = require("path/to/serviceAccountCred.json");

const app = initializeApp({
    credential: admin.credential.cert(serviceAccount)
});

exports.verifyToken = onRequest((req, res) => {
    const { uid, token } = req.query;

    if (!uid || !token) {
        res.status(400).send('Paramètres manquants : uid et token sont requis.');
        return;
    }

    app.Auth().verifyIdToken(token).then((decodedToken) => {
        if (decodedToken.uid === uid) {
            res.status(200).send('Token valide.');
        } else {
            res.status(401).send('Token invalide.');
        }
    }).catch((error) => {
        res.status(500).send(error.message);
    });
});

But, using this code, I keep getting this error :

Internal Server Error : 500

Here is my Flutter request code :

Future<void> validateTokenDB() async {
    String token="";

    try {
      token = await getIdToken() ?? "";
    } catch (e) {
      // Handle error
      print('Error getting token: $e');
    }

    String uid = firebaseAuth.currentUser!.uid;

    // Creating the query parameters
    Map<String, String> queryParams = {
      'uid': uid,
      'token': token,
    };

    // Constructing the URL with query parameters
    Uri url = Uri(
      scheme: 'https',
      host: 'link-to-the-function-url.a.run.app',
      queryParameters: queryParams,
    );

    try {
      // Sending the HTTP request
      http.Response response = await http.get(url);

      // Handling the response
      if (response.statusCode == 200) {
        // Request was successful
        print(response.body);
        print('Token updated successfully');
        return;
      } else {
        // Request failed
        print('${response.body} : ${response.statusCode}');
        Auth().signOut();
      }
    } catch (e) {
      // Error occurred during HTTP request
      print('Error during HTTP request: $e');
      Auth().signOut();
    }
    Auth().signOut();
  }

Hope you can help me resolve this error.