Zoe Wang created HTTPCLIENT-2328:
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Summary: Request hangs if TLS 1.3 connection is half-closed
Key: HTTPCLIENT-2328
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2328
Project: HttpComponents HttpClient
Issue Type: Bug
Components: HttpClient (classic)
Affects Versions: 5.3.1, 4.5.14
Reporter: Zoe Wang
Attachments: HalfCloseApache5Client.Java, HalfCloseServer.java,
TlsHalfCloseApache4.java, keystore.jks
If a server with TLS 1.3 support closes the connection during the request, more
specifically, sending close_notify while the client is still writing to socket,
the request will hang indefinitely. It's not an issue with TLS 1.2 because it
uses duplex-close policy. With TLS 1.3's half-closed connection policy, it
seems Apache HTTP client is not able to detect connection closure properly. We
are able to reproduce the issue with both 4.x and 5.x. I should note that HTTP
URL connection does not have this issue.
The workaround it to set `jdk.tls.acknowledgeCloseNotify` to true (see
https://bugs.openjdk.org/browse/JDK-8208526), but that would require a lot of
users to make changes on their side.
Steps to repro:
* Download the attached keystore file
* Update ksPath in the server code HalfCloseServer.java to where you download
the keystore
* Run the server, the server will begin listening on {{localhost:8081}}
* Create a random file of size 128MB and update client code `testFile` to
where the file is.
* Run the client, it should hang
* If System.setProperty("jdk.tls.acknowledgeCloseNotify", "true") is
uncommented, it will not hang
* It also won’t hang if we we force TLS1.2
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