Leif Hedstrom created TS-3476:
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             Summary: Add a log tag for APLN/NPN negotiated protocol
                 Key: TS-3476
                 URL: https://issues.apache.org/jira/browse/TS-3476
             Project: Traffic Server
          Issue Type: New Feature
          Components: Logging, SSL
            Reporter: Leif Hedstrom


It seems crucial to be able to log which protocol handler was negotiated with 
ALPN (and perhaps NPN as long as we support it). This could simple be the 
string that was negotiated by the client/server in the TLS handshake. For 
example, with HTTP/2, it would be "h2" (or "h2-14" with some browsers).

A suggested log tag name would be %<alpn> which seems clear enough to me and 
easy to remember :).



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