Github user jeking3 commented on the issue: https://github.com/apache/thrift/pull/1260 I believe that is intentional for backwards compatibility. A multiplexing server should be able to accept an older client and use the "default" service for it - at least in the Java multiplexing server. So they should end up using the same protocol (binary or compact) but a multi-binary server should be able to service a binary client.
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