Subscription on netty http not working

[calebcodesgud]

I have a @SubscriptionMapping datafetcher which returns a flux. The data fetcher returns the flux to the client reactively when I run spring graphql on a websocket server and I'm happy with its performance. However, when I run spring graphql on netty webflux, the same datafetcher just returns:

{"data":{"upstreamPublisher":{"scanAvailable": true, "prefetch": -1}}}

and then terminates...

The only other reference to this that I can find is spring-projects/spring-boot#30052
This made against the spring projects repo by that developer and was closed for not providing enough information.

Please let me know if you need more from me. Thank you!

[bclozel]

Could you provide a sample application showing the issue? Ideally, an application created on https://start.spring.io, that we can git clone and run.

[calebcodesgud]

@bclozel You can clone from here: https://github.com/calebcodesgud/sgql-streaming-issue/tree/main

Forgive the lack of a virtual environment please, I've included my jdk and maven version in the read me.
Please try running the application from local then run each of the unit tests. I was able to reproduce the same behavior with this.

[bclozel]

@calebcodesgud I think this was mostly an issue with the testing setup.
I've sent a PR to your sample repository, with various commits explaining the changes. See calebcodesgud/sgql-streaming-issue#1

I'm closing this as the feature works as expected. Thanks!

[calebcodesgud]

@bclozel Changing the test implementation here doesn't really solve the issue as I see the same problem when the application is deployed and called via webclient... should I be using a different client to execute the http subscription?

[bclozel]

We're shipping a dedicated client for that case. In your original project you were using a mix of graphql-kickstart and hand-made HTTP requests.
You can check that the server side behaves properly by calling it from the GraphiQL UI.

Also, currently only the WebSocket transport supports subscriptions.

[calebcodesgud]

Thanks @bclozel ! is adding http subscription support in the roadmap at all?

[bclozel]

@calebcodesgud Not right now, see this comment for more context.

[tjulioh]

Same here, but I think we're trying to do get/post htpp request. It should be performed wss from what I understand.