FrameLogger doesn't show the "Data" in KEEPALIVE frames

[siddharthaDevineni]

Summary

When a client (e.g., an angular client) sends a KeepAlive Frame with Data attached (e.g., clientId) to the RSocket spring-boot server, the server receives it for sure because the "receiving" frame length is more than 14 bytes - in my case, it is 69 bytes. However, the rsocket FrameLogger does not show the received data in the "Data" field; it is always empty. So, I implemented a CustomFrameLogger which shows the Data field with the received data from the client as expected. Is there any other way to show the data in the Data field?

Expected Behavior

When a client sends a KEEPALIVE frame to the server with Data attached to it, the rsocket FrameLogger is expected to show the received Data from the client as shown in the below screenshot:

Actual Behavior

Instead, the Data field that is showing is always empty even though the frame's total length is 69 bytes, which is clearly shown in the field Length of FrameLogger (the length of the attached Data that I sent from the client is 54 bytes). That means, the rsocket server apparently receives the data but somehow it is not able to show it in the KEEPALIVE FrameLogger as shown in the below screenshot:

Steps to Reproduce

Attach some Data in Buffer to a KeepAlive Frame and send it via the send(Frame) method of a duplex connection from the client.

Possible Solution

Implementation of a CustomFrameLogger in Java and using it to show the received data in the KEEPALIVE frames.

Environment

• RSocket version(s) used: rsocket-core: 1.1.3, spring-boot-starter-rsocket: 3.3.4, spring-security-rsocket:6.3.3
• Other relevant libraries versions - rsocket-transport-netty: 1.1.3, netty-core: 1.1.22, reactor-core: 3.6.10
• Platform (eg. JVM version (java -version): java: openjdk 21.0.5, OpenJDK Runtime Environment (build 21.0.5+11-Ubuntu-1ubuntu124.04)

[rstoyanchev]

The spec does allow KEEPALIVE frames to have data, but FrameUtils doesn't try to show it.

[rstoyanchev]

Superseded by #1119.