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https://issues.apache.org/jira/browse/TS-3476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14535061#comment-14535061
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Leif Hedstrom commented on TS-3476:
-----------------------------------
As sudheer points out, we should make sure we make any such tags compatible
with both client and server side going forward (we only support client side
right now). So maybe
%<ctnp> - Client TLS Negotiated Protocol
%<stnp> - Server TLS Negotiated Protocol
> 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
> Fix For: 6.0.0
>
>
> 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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