Github user shroman commented on the issue:
https://github.com/apache/incubator-rocketmq/pull/53
Sounds good to check for the protocol version in the request header, and
reject with an error when not matched.
Probably, `RemotingCommand.REMOTING_VERSION_KEY` will work, but I would
create a version policy based not on the release (that is used now) but on the
protocol changes, so that we don't have to introduce a new checking condition
in the code with each release. Just an idea.
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