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https://issues.apache.org/jira/browse/TS-2987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15387164#comment-15387164
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James Peach commented on TS-2987:
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If you look in the git history we used to have a "protocol stack" object that
contained a bit mask of all the protocol layers beneath a HTTP transaction. Not
sure we would resurrect that code, but the concept may still be useful. It
would let you express that this requests is HTTP/2 over TCP or HTTP/2 over QUIC
or HTTP/1 over TLS.
> TS API to identify if the client connection is via HTTP/2
> ---------------------------------------------------------
>
> Key: TS-2987
> URL: https://issues.apache.org/jira/browse/TS-2987
> Project: Traffic Server
> Issue Type: Improvement
> Components: HTTP/2, TS API
> Reporter: Sudheer Vinukonda
> Fix For: 7.0.0
>
>
> Need a TS API for the plugins to be able to identify whether the incoming
> client connection is via SPDY. The plugins would like to relay this
> information over to the origins which may return a different kind of response
> for a spdy client vs a non-spdy client. For example, the origins may skip the
> optimizations such as domain-sharding which work well with non-spdy clients,
> but, would cancel the benefits of spdy to multiplex requests.
> The proposed API (the sole credit goes to [~amc]) checks the plugin_tag to
> identify if the connection is spdy. In the future, the HttpSM data structure
> may be enhanced to store a spdy indicator.
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