s_server/s_client on checking middlebox compatibility

[John Jiang]

Is it possible to check if peer implements middlebox compatibility by
s_server/s_client?
It looks the test tools don't care this point.
For example, if a server doesn't send change_cipher_spec after
HelloRetryRequest, s_client still feels fine.That's not bad. But can I
setup these tools to check middlebox compatibility?
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