Github user oknet commented on the issue:
https://github.com/apache/trafficserver/pull/1446
@shinrich Maybe the SSL_CTX_set_early_cb() is better than
SSL_CTX_set_tlsext_servername_callback() ?
Only one plugin could hook on the TS_SSL_SERVERNAME_HOOK since the
SSL_CTX_set_tlsext_servername_callback() can not stop.
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