Tim Davidson created HTTPCLIENT-2324:
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Summary: Apache HttpClient 5 blocks for double the duration set by
requestTimeout when using TLS
Key: HTTPCLIENT-2324
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-2324
Project: HttpComponents HttpClient
Issue Type: Bug
Components: HttpClient (classic)
Affects Versions: 5.3.1
Environment: OpenJDK Runtime Environment Corretto-17.0.8.7.1
Reporter: Tim Davidson
I have an issue in my application using Spring's RestTemplate configured with
Apache HttpClient 5 as the underlying http client. My application is calling a
downstream legacy system, and while that system is "down" for maintenance, it
still accepts connections (TLS handshake and all), but never returns a response.
The problem I'm having is when I set the request timeout at 8 seconds on the
Apache client, requests sent to this downstream service are blocking for double
that timeout setting (16 seconds).
I have this isolated to the Apache HttpClient, and have reproduced this
behavior in a unit test using self-signed certs. Since the code necessary to
reproduce is too long to post here, I have a repository with the test
reproducing the issue here:
[apache-httpclient-socket-timeout-test|https://github.com/tndavidson/apache-httpclient-socket-timeout-test]
You can see in the following logs that the read timeout does happen after the
configured 8 seconds, but it is blocking for an additional 8 seconds to close
the connection. This doesn't happen using HTTP, only HTTPS.
{code:java}
14:45:21.587 [main] DEBUG org.apache.hc.client5.http.wire -- http-outgoing-1 >>
"[\r][\n]"
14:45:29.589 [main] DEBUG org.apache.hc.client5.http.wire -- http-outgoing-1 <<
"[read] I/O error: Read timed out"
14:45:29.589 [main] DEBUG o.a.h.c.h.i.i.DefaultManagedHttpClientConnection --
http-outgoing-1 Close connection
14:45:37.591 [main] DEBUG o.a.h.c.h.i.c.InternalHttpClient --
InternalConnectionEndpoint-7eb6b6b6 endpoint closed {code}
I've included two additional tests that show this issue is 1) not present when
not configured for TLS, and 2) not present when configuring the same TLS
configuration using the JDK's native HttpClient.
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