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https://issues.apache.org/jira/browse/TS-2912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14083252#comment-14083252
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William Bardwell commented on TS-2912:
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Why did you want it to add If-Modified-Since or If-None-Match if the request is
a HEAD request?
The chnge to request_conditional seems reasonable, but not sure that it will
fix it, it seems like handle_cache_operation_on_forward_server_response() needs
to not delete things...
> HEAD transaction on stale entry deletes cache entry
> ---------------------------------------------------
>
> Key: TS-2912
> URL: https://issues.apache.org/jira/browse/TS-2912
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Reporter: William Bardwell
> Assignee: weijin
> Labels: review
> Fix For: 5.1.0
>
> Attachments: ts-2912.try1.diff
>
>
> On a stale cache entry a HEAD gets tunneled to the origin, but when a 200
> comes back
> HttpTransact::handle_cache_operation_on_forward_server_response(State* s)
> deletes the cache entry, it seems like it should just ignore it (or check
> ETag/Last-Modified and maybe delete if those don't match, but not
> unconditionally.)
> I am seeing this with 4.2.X with a plugin fiddling with stuff, but the code
> looks the same in trunk, line 4318 looks like the problem line.
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