Hey Growthbook Team, We were getting a lot of initialization failure for our growthbook setup in flutter, with the error

failed to lookup host

, and wanted to implement a retry mechanism when initialization fails. GBSDKBuilder provides a failure callback but seems like there is no init retry mechanism build around failure handling, our init logic is written in a singleton pattern so creation new object if init fails doesn't seem viable either, so wanted to understand how can we tackle this problem are there any helpful inbuild methods whcih gb provides for init retry?

@freezing-postman-69602 can you take a look?

@freezing-postman-69602 any updates?

Just catching up on this thread now — Thank you for your patience. We do not retry the initial feature fetches as we have several other ways to reload / refresh the features both automatically and manually once the SDK is created. for eg: 1) There's a manual way to set the default features via

gbFeatures

parameter, if only the calls made at initialization are failing. Here's a sample:

final defaultFeatures = <String, GBFeature>{
  'feature_key': GBFeature(defaultValue: true),
  // Add your fallback features
};

final sdk = await GBSDKBuilderApp(
  apiKey: 'your_api_key',
  hostURL: 'your_host_url',
  growthBookTrackingCallBack: (experiment, result) {},
  gbFeatures: defaultFeatures, // Fallback features
  onInitializationFailure: (error) {
    // Handle failure
  },
).initialize();

2) Reload Strategies - Automatic vs Manual • if you enable

backgroundSync: true

, the sdk will use SSE to update the features as and when there's a change. • Or Use the method -

refresh()

to trigger this fetch manually. Here's an example of how you can do this with an exponential back-off and a

refreshHandler

.

GBSDKBuilderApp(
  // ... other params
  onInitializationFailure: (error) async {
    if (error?.error.toString().contains('failed to lookup host') ?? false) {
      await _retryWithBackoff();
    }
  },
).setRefreshHandler((isSuccess) {
  if (!isSuccess) {
    // Schedule retry
    Future.delayed(Duration(seconds: 5), () => sdk.refresh());
  }
}).initialize();

Future<void> _retryWithBackoff() async {
  for (int i = 0; i < 3; i++) {
    await Future.delayed(Duration(seconds: math.pow(2, i).toInt()));
    await sdk.refresh();
  }
}

okay thanks for the response will try this out.

I'm sorry this got buried down in the conversations. Were you able to make progress? Or need help with this?