Expected a SETTINGS frame but was WINDOW_UPDATE

[Blarc]

Describe the bug
When making a request to OpenAI, an IOException is thrown. The error java.lang.RuntimeException: java.io.IOException: Expected a SETTINGS frame but was WINDOW_UPDATE is indicative of a problem that likely arises at the level of the HTTP/2 protocol, within model.generate call.

Supposedly works fine on Windows 10, but not on Ubuntu 22.04 source.

Log and Stack trace
tail_log.txt

To Reproduce
I am not sure how to reproduce, since it doesn't always happen. The langchain4j is used as a dependency for IntelliJ plugin.

Expected behavior
The request to OpenAI to go through.

Please complete the following information:

• LangChain4j version: 0.33.0
• LLM(s) used: OpenAI (gpt-4o)
• Java version: 17

Additional context
Blarc/ai-commits-intellij-plugin#226

[yschimke]

Does it happen for you, or for some other developer? Are there any proxies in the way, like charles?

Anything that might be affecting the stream at the http/2 layer?

[Blarc]

Maybe @Trileon12 can provide that information, since he reported the issue.

[Trileon12]

Actually, on Ubuntu, I don't use a proxy (i mean ide proxy) because when I do, I receive a different error related to unsuccessful proxy authentication.
But... at the router level, split tunneling is used, and requests to this server are currently routed through a WireGuard vpn connection. Could this be causing the issue?
Interestingly, on Windows, the same application in the same LAN works without triggering the "WINDOW_UPDATE" error. Additionally, it also works with proxy settings enabled in the ide without any issues.

[yschimke]

Wireguard should be at a lower layer, so shouldn't intercept any http/2 traffic

[yschimke]

Unless we can reproduce, it's going to be hard to fix.

You may want to provide an option to force http/1.1 in the OkHttp client. Or clearing the proxy in code as an option, see if that fixes the auth issue.

[swankjesse]

No action for us to take on this.