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https://issues.apache.org/jira/browse/HTTPCLIENT-2017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16940534#comment-16940534
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Richard Hernandez commented on HTTPCLIENT-2017:
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[~olegk] Here's a simple test which reproduces it: 
https://gist.github.com/rhernandez35/c7bda8de618e21ad06eb40b5ffc3fdb6

Change {{HEAD}} to {{GET}} and it no longer fails with a 
{{ConnectionClosedException}}.

> HttpClient5 double-closes IOSessions for HTTP/1.1 HEAD requests
> ---------------------------------------------------------------
>
>                 Key: HTTPCLIENT-2017
>                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2017
>             Project: HttpComponents HttpClient
>          Issue Type: Bug
>            Reporter: Richard Hernandez
>            Priority: Major
>
> 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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