Github user masaori335 commented on the issue:
https://github.com/apache/trafficserver/pull/829
That's good idea:)
@petarpenkov would you add `TSHttpSsnClientProtocolGet(TSHttpSsn ssnp)`
which is wrapper of `ProxyClientSession::get_protocol_string()` ? ( Session
version of `TSHttpTxnClientProtocolGet(TSHttpTnx tnxp)` )
When we want to write some plugins to extend HTTP/2 (e.g. origin-frame,
cache-digest), it is useful to get client protocol at session hooks.
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