[Bug] Sending batch messages by proxy using remoting protocol response error

[gaoyf]

Before Creating the Bug Report

• I found a bug, not just asking a question, which should be created in GitHub Discussions.

• I have searched the GitHub Issues and GitHub Discussions of this repository and believe that this is not a duplicate.

• I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ.

Runtime platform environment

OS: CentOS 6.9

RocketMQ version

branch: (develop|tag 5.3.1) version: 5.3.1

JDK Version

JDK: 1.8.0_202

Describe the Bug

When send batch messages by proxy using remoting protocol, response err:
org.apache.rocketmq.client.exception.MQBrokerException: CODE: 15 DESC: Request doesn't have field bname BROKER: xx.xx.xx.xx:8080 For more information, please visit the url, https://rocketmq.apache.org/docs/bestPractice/06FAQ

Steps to Reproduce

Send batch messages by proxy using remoting protocol.

What Did You Expect to See?

No error response.

What Did You See Instead?

Error response.

Additional Context

No response