vyvy3

Wanna take the issue and have a question: when the error occurs during register request execution, should the ExtensionsRunner manually `throw` an exception so `AcknowledgedResponseHandler` will handle it, or is...

@dbwiddis yeah I'm still working on this

One more addition, `sendEnvironmentSettingsRequest` currently working with the `Settings` class, when all the methods of `EnvironmentSettingsResponseHandler` are shaped to work with `CompletableFuture`, should I create a new handler for this?...

> It's your choice whether to rewrite it to be asynchronous the same as everything else (probably my preference) This means, going deeply into detail, I still need to work...

Well I screwed a bit and had pushed my changes also with #512, since it was my main branch, can you check it urself if possible, I'll for now wait...