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https://issues.apache.org/jira/browse/TS-3148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14177637#comment-14177637
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Nick Kew commented on TS-3148:
------------------------------
I hope to find time to figure out where it's coming from, but any clues will of
course be welcome.
I suspect some kind of logic "we haven't seen any request headers, therefore
it's HTTP/0.9" that can hopefully be corrected to "we haven't seen any request
headers because we aborted it too early".
> TS shows HTTP/0.9 behaviour when a request is aborted early
> -----------------------------------------------------------
>
> Key: TS-3148
> URL: https://issues.apache.org/jira/browse/TS-3148
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP, TS API
> Reporter: Nick Kew
> Fix For: sometime
>
>
> When a plugin fails per-txn initialisation in a TXN_START function, it should
> be able to return a 500 (Internal Server Error) response.
> Instead, TS returns an HTTP 0.9 response: no response code or headers! A
> TSHttpTxnErrorBodySet is honoured and works correctly, but setting Response
> code, Reason, and Headers are silently ignored.
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