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https://issues.apache.org/jira/browse/TS-3652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14568961#comment-14568961
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Alan M. Carroll commented on TS-3652:
-------------------------------------

Originally I thought it might be best to declare that if the cache key is set 
via the API, that's it, it can't change. But I think there may be situations 
where even if a plugin doesn't set the cache key it would be useful to be able 
to inhibit changing the cache key during a redirect.

But rather than a separate override var to control this, we may want to extend 
the values that can be passed to TSRedirectEnable() to include "disable", 
"enable", "enable with locked cache key".

> During 3xx redirect follow, TS uses the redirect url as the cache key 
> ignoring any cache key set via API
> --------------------------------------------------------------------------------------------------------
>
>                 Key: TS-3652
>                 URL: https://issues.apache.org/jira/browse/TS-3652
>             Project: Traffic Server
>          Issue Type: Bug
>          Components: HTTP
>            Reporter: Sudheer Vinukonda
>
> Currently, during 3xx redirect follow, TS uses the redirect url (as received 
> in the *Location* header of the 3xx response) as the cache key for storing 
> the subsequent response to the redirect follow request. This works fine in 
> most cases, since, the original client request would have cached the 3xx 
> response and the final response would still be derived using the redirect 
> follow url. This also allows direct requests to the redirect follow location 
> be served from the cache efficiently.
> However, this is not desirable in some cases, especially when there's a TS 
> API (plugin) modifying the cache key and wanting to store the final response 
> against the modified cache key directly. 
> Proposing to add a config setting to allow storing API set cache key during 
> redirect follow.



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