Github user shinrich commented on the pull request: https://github.com/apache/trafficserver/pull/350#issuecomment-159413805 From my understanding of the code the SSN_START hooks happen after the SSL connections have been negotiated. So you would miss debug messages there. I would assume that you would miss some startup messages from HTTP2/SPDY too particularly since our SSN/TXN differentiation is mixed up after the addition of multiplexing protocols like HTTP2 and SPDY.
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