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https://issues.apache.org/jira/browse/HTTPCORE-718?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17573912#comment-17573912
 ] 

Oleg Kalnichevski commented on HTTPCORE-718:
--------------------------------------------

[~sajiniekavindya] HttpCore makes its best effort to evict invalid connections 
at soon as possible, but if the server fails to play nicely (for instance, by 
sending `Connection: keep-alive` and closing the connection nonetheless) it can 
happen that connections can get closed by the opposite endpoint after they have 
been validated and leased from the pool and assigned to execute a message 
exchange.

Oleg 

> Getting org.apache.http.ConnectionClosedException after httpcore-nio version 
> upgrade
> ------------------------------------------------------------------------------------
>
>                 Key: HTTPCORE-718
>                 URL: https://issues.apache.org/jira/browse/HTTPCORE-718
>             Project: HttpComponents HttpCore
>          Issue Type: Bug
>          Components: HttpCore NIO
>    Affects Versions: 4.4.15
>         Environment: Java version: 11.0.15.1
> OS: macOS Monterey (Version 12.12.1) 
>            Reporter: Sajinie Kavindya
>            Priority: Major
>         Attachments: HttpNIOTestClient-1.zip, HttpNIOTestClient.zip
>
>
> We recently migrated to httpcore-nio 4.4.15 and we have been encountering 
> some issues when connecting to an HTTPS Backend that sends chunked responses. 
> The backend behaves in such a manner that when it sends the response, it 
> immediately closes the connection after completion. 
> We have attached a reproducer to this ticket and the behavior is as below.
> When httpcore-nio 4.4.15 is used, the client gets the error:
> {code:java}
> org.apache.http.ConnectionClosedException: Connection closed 
> unexpectedly{code}
> But, when httpcore-nio 4.4.5 is used, the client receives the complete 
> response, which was sent from the backend.
> We further checked on the following versions and the observations are as 
> below. 
>  * httpcore-nio 4.4.10 - receives the complete response
>  * httpcore-nio 4.4.11 - receives org.apache.http.ConnectionClosedException
> In order to replicate the issue, we did a few changes to the 
> consumeContent(final ContentDecoder decoder) method inside the 
> SimpleInputBuffer class. You may find the changes in the attached source code.
> In order to test the behavior, please run the Main class: 
> “{*}TestChunkedBackend{*}”.
> Tested environment:
>  * Java version: 11.0.15.1
>  * OS: macOS Monterey (Version 12.12.1) 
> A similar issue can be found here 
> [https://issues.apache.org/jira/browse/HTTPCORE-706|http://example.com]
> Thanks & Regards,
> Sajinie
>  



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