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https://issues.apache.org/jira/browse/TS-2987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15386971#comment-15386971
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Kit Chan commented on TS-2987:
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I think [~sudheerv] originally has a patch to use plugin_tag for this purpose.
I am not too sure why it is no longer attached to this jira.
[~sudheerv], can you share some history with us on this?
> 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: Plugins, SPDY
> Reporter: Sudheer Vinukonda
>
> 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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