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https://issues.apache.org/jira/browse/HTTPCORE-740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17713491#comment-17713491
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Arunan Sugunakumar commented on HTTPCORE-740:
---------------------------------------------
Hi,
Please find the detailed analysis below.
In httpcore-nio 4.4.13 during a timeout scenario, after the client sends FINACK
to the server, the server does not respond with a FINACK and closes the
connection with RESET packet after some time.
!Screenshot 2023-04-18 at 13.45.10.png|width=699,height=192!
In httpcore-nio 4.4.14, after the client sends FINACK to the server, the server
promptly sends a FINACK back and closes the connection. I believe this has been
fixed due to this fix[1]. The server still has a read mask during the CLOSING
state and it reads the FINACK from the client and sends FINACK back before
closing the connection gracefully.
!Screenshot 2023-04-18 at 13.44.01.png|width=702,height=163!
In httpcore-nio 4.4.16, again this behavior has broken due to the fix[2]. Since
we are no longer listening to the client FINACK during CLOSING state, the
server does not respond back with a FINACK and closes the connection
gracefully. As a result, a RESET packet gets sent to the client after some time.
!Screenshot 2023-04-18 at 13.43.02.png|width=714,height=124!
You can find a reproducer here[3] and the above behavior can be tested with the
below curl command.
{code:java}
curl -X POST -k 'https://localhost:8443' -v {code}
[1]-
[https://github.com/apache/httpcomponents-core/commit/bf12c7dd9eabf0cd75bd6c70ac6b285b0d4430a5]
[2]-
https://github.com/apache/httpcomponents-core/commit/608347c1636a06a9515d326285ac26db0c9c9a4a
[3]- [^HttpNIOTestServer-740.zip]
Thanks & Regards,
Arunan
> Connection resets during timeouts
> ---------------------------------
>
> Key: HTTPCORE-740
> URL: https://issues.apache.org/jira/browse/HTTPCORE-740
> Project: HttpComponents HttpCore
> Issue Type: Bug
> Components: HttpCore NIO
> Affects Versions: 4.4.16
> Reporter: Arunan Sugunakumar
> Priority: Major
> Attachments: HttpNIOTestServer-740.zip, Screenshot 2023-04-18 at
> 07.53.12.png, Screenshot 2023-04-18 at 13.43.02.png, Screenshot 2023-04-18 at
> 13.44.01.png, Screenshot 2023-04-18 at 13.45.10.png
>
>
> We observed an issue where with a httpcore-nio server timeout scenario, the
> server sends a FINACK to the client and if the client sends a close_notify
> alert, the server is immediately sending a RESET and closing the connection.
> Ideally, the server should also send a close_notify and terminate the
> connection gracefully. This issue is observed with only the clients which
> send close_notify for a server FINACK. The below attached is a TCP capture
> during the timeout scenario (server port: 8253). The server uses the latest
> 4.4.16 httpcore-nio library.
> !Screenshot 2023-04-18 at 07.53.12.png|width=1466,height=150!
> Is there any way to avoid this scenario and send a close_notify from the
> server as well to terminate the connection gracefully?
> PS: I am currently working on a simple reproducer to attach here, and I'll
> attach it as soon as possible.
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