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https://issues.apache.org/jira/browse/HTTPCORE-604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941299#comment-16941299
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Richard Hernandez commented on HTTPCORE-604:
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[~olegk] This fixes the bug for now, but I think it's a bit weird that the
exchange handler the client uses is [still willing to mark this connection as
reusable|https://github.com/apache/httpcomponents-client/blob/b717fde2897c338566a95494dd392be046e5050f/httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/HttpAsyncMainClientExec.java#L202].
> HttpClient5 double-closes IOSessions for HTTP/1.1 HEAD requests
> ---------------------------------------------------------------
>
> Key: HTTPCORE-604
> URL: https://issues.apache.org/jira/browse/HTTPCORE-604
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Reporter: Richard Hernandez
> Priority: Major
> Fix For: 5.0-beta9
>
>
> HttpClient5 consistently fails HEAD requests that have the "Connection:
> close" header on the response because the runtime always attempts to close
> the IOSession handling the connection twice. The second close triggers a
> ConnectionClosedException, causing the request to fail.
> For some reason, this only affects HEAD requests. All other HTTP methods work
> fine.
> I don't have a repro that I can share yet, but I'm working on a fix. I'm
> letting you know because I don't know if I'll need to make any changes in
> core (I suspect I will). Can you wait to release beta9 until I have a root
> cause?
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