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https://issues.apache.org/jira/browse/TS-4394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15425149#comment-15425149
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Alan M. Carroll commented on TS-4394:
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I think {{history}} member of the {{HttpSM}} does this, I think.
> HttpSM should keep track of what states it has passed through
> -------------------------------------------------------------
>
> Key: TS-4394
> URL: https://issues.apache.org/jira/browse/TS-4394
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core
> Reporter: Thomas Jackson
> Fix For: sometime
>
>
> When implementing the fix for TS-4328 I needed to answer the question "did we
> ever send bytes to the server". This should be relatively simple to answer--
> as there is a specific state that connects to origin and then sends the
> request. At this point nothing in the SM keeps track of where we have been,
> the closest we have are the milestones-- which we are apparently not happy
> with using for any logic (only for metrics).
> So, the TLDR is that we'd like a mechanism in the HttpSM to see where the SM
> has gone and its current state. This would be especially helpful for
> debugging, as we would be able to tell what all the SM has done.
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