Dio Integration

Learn more about the Sentry Dio integration for the Dart SDK.

The sentry_dio library provides Dio support for Sentry using the HttpClientAdapter. It is able to collect breadcrumbs, run tracing for HTTP requests, and capture events for failed requests.

To add the Dio integration, add the sentry_dio dependency.

pubspec.yaml
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dependencies:
  sentry: ^8.10.0
  sentry_dio: ^8.10.0
  dio: ^4.0.0

Configuration should happen as early as possible in your application's lifecycle.

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import 'package:sentry_dio/sentry_dio.dart';
import 'package:sentry/sentry.dart';

Future<void> main() async {
  await Sentry.init(
    (options) {
      options.dsn = 'https://examplePublicKey@o0.ingest.sentry.io/0';
    },
    appRunner: initApp, // Init your App.
  );
}

final dio = Dio();

// This *must* be the last initialization step of the Dio setup.
dio.addSentry(...);

The Interceptors can also catch exceptions that may occur during requests — for example DioError.

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import 'package:sentry_dio/sentry_dio.dart';

final dio = Dio();

dio.addSentry();

final response = await dio.get<String>('https://wrong-url.dev/');

This is an opt-out feature. The following example shows how to disable it:

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import 'package:sentry/sentry.dart';

Future<void> main() async {
  await Sentry.init(
    (options) {
      options.dsn = 'https://examplePublicKey@o0.ingest.sentry.io/0';
      options.captureFailedRequests = false;
    },
    appRunner: initApp, // Init your App.
  );
}

The Dio integration also provides insight into tracing for your HTTP requests done with Dio.

  • The created spans will be attached to the transaction on the scope - if no transaction is on the scope the span will not be sent to Sentry.
  • The SDK sets the span operation to http.client and the description to request $METHOD $url. For example, GET https://sentry.io.
  • The span finishes once the request has been executed.
  • The span status depends on either the HTTP response code or SpanStatus.internalError() if the code does not match any of Sentry's SpanStatus options.
  • When the HTTP request throws an Exception, Sentry's SDK associates this exception to the running span. If you haven't set the SDK to swallow the exception and capture it, the span and SentryEvent will be linked when viewing it on the Issue Details page in sentry.io.

Before starting, ensure:

  1. The Sentry Flutter SDK is initialized. Learn more here.
  2. Tracing is set up. Learn more here.

Call addSentry() on your instance of `Dio:

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import 'package:sentry_dio/sentry_dio.dart';

final dio = Dio();

dio.addSentry();

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import 'package:sentry_dio/sentry_dio.dart';

Future<void> makeWebRequestWithDio() async {
  final dio = Dio();
  dio.addSentry();

  // If there is no active transaction, start one
  final transaction = Sentry.startTransaction(
    'dio-web-request',
    'request',
    bindToScope: true,
  );
  final span = transaction.startChild(
    'dio',
    description: 'desc',
  );
  Response<String>? response;
  try {
    response = await dio.get<String>(exampleUrl);
      span.status = const SpanStatus.ok();
    } catch (exception, stackTrace) {
      span.throwable = exception;
      span.status = const SpanStatus.internalError();
      await Sentry.captureException(exception, stackTrace: stackTrace);
    } finally {
      await span.finish();
    }
}

To view the recorded transaction, log into sentry.io and open your project. Clicking Performance will open a page with transactions, where you can select the just recorded transaction with the name dio-web-request.

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