Github user jpeach commented on the issue:
https://github.com/apache/trafficserver/pull/801
I had to re-read this code to refresh my memory on how this works. I think
that the invariant that the ``ProxyClientSession`` requires is that the API
hooks are the first and last operations performed on the session. This means
that the handler must be ``NULL`` when delivering the ``SSN_START`` event
(which is always true because this is done before ``start()``). It also means
that we should not have to worry about other event handlers when delivering
``SSN_CLOSE``, because the only ``destroy()`` happens after this.
I agree that ``state_api_callout`` should not be virtual (it should be
private).
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