DefaultHttpClient logs DefaultHttp2PingFrame warning

[waynerijsdijk]

Expected Behavior

The DefaultHttpClient should not log a warning at every request if the destination server supports http2.

Actual Behaviour

I'm getting a warning log at every request if the destination server supports http2.

[default-nioEventLoopGroup-1-4] WARN i.m.h.client.netty.DefaultHttpClient - Unexpected message on HTTP2 connection channel: DefaultHttp2PingFrame(content=580, ack=false)

I got this warning after upgrading from Micronaut 3.8.9 to 4.2.3.

Steps To Reproduce

Use a declarative client which fires a request to a http2 enabled server

See my attached example application. Just call http://localhost:8080 and see the warn log appear.

Environment Information

• Operating system: Windows 10, Windows 11 and Ubuntu Linux
• JDK version: Tested with Java 17 and Java 21

Example Application

https://github.com/waynerijsdijk/micronaut-http2-ping-warning

Version

4.2.3

[oliverkuntze]

Same here

[tchiotludo]

same here, in my case, it's initial request to get oidc specification on url https://accounts.google.com that is causing the issue and log here : https://github.com/micronaut-projects/micronaut-core/blob/4.3.x/http-client/src/main/java/io/micronaut/http/client/netty/ConnectionManager.java#L658

[roar-skinderviken]

Still an issue with micronaut-core:4.3.6 (micronaut-parent:4.3.2)