Sample project for dio.addSentry() issue on Flutter web

main.dart

import 'dart:developer';

import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:sentry_dio/sentry_dio.dart';
import 'package:sentry_flutter/sentry_flutter.dart';

const String kSentryDsn = String.fromEnvironment('SENTRY_DSN');

const _gistTemplateUrl =
    'https://gist.githubusercontent.com/bizz84/5c2ee79cd103bd43ce97b4d7fcfed103/raw/app_release_template.json';

/// An API client class for fetching the JSON template from a GitHub gist
class GistClient {
  const GistClient({required this.dio});
  final Dio dio;

  /// Fetch the JSON template from the Gist URL defined above
  // * No serialization is done here as the parsing happens when loading the
  // * data in the database
  Future<String> fetchJsonTemplate() async {
    final response = await dio.get(_gistTemplateUrl);
    return response.data;
  }
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await SentryFlutter.init((options) {
    options.dsn = kSentryDsn;
    // Use the beforeSend callback to filter which events are sent
    options.beforeSend = (SentryEvent event, Hint hint) async {
      // If there was no response, it means that a connection error occurred
      // Do not log this to Sentry
      final exception = event.throwable;
      if (exception is DioException && exception.response == null) {
        return null;
      }
      // For all other events, return the event as is
      return event;
    };
  });
  final dio = Dio();
  dio.addSentry();

  final gistClient = GistClient(dio: dio);
  try {
    final jsonString = await gistClient.fetchJsonTemplate();
    log(jsonString);
    runApp(MainApp(string: jsonString));
  } catch (e) {
    log(e.toString());
    runApp(MainApp(string: e.toString()));
  }
}

class MainApp extends StatelessWidget {
  const MainApp({super.key, required this.string});
  final String string;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(body: Center(child: Text(string))),
    );
  }
}

pubspec.yaml

name: sentry9_web_error
description: "A new Flutter project."
publish_to: 'none'
version: 0.1.0

environment:
  sdk: ^3.9.2

dependencies:
  flutter:
    sdk: flutter
  dio: ^5.9.0
  sentry_flutter: ^9.6.0
  sentry_dio: ^9.6.0

dev_dependencies:
  flutter_test:
    sdk: flutter
  flutter_lints: ^5.0.0

flutter:
  uses-material-design: true