The following test failed in the JDK21 CI:

java/net/httpclient/ExpectContinueTest.java

Here's a snippet from the log file:

#section:testng
----------messages:(9/749)----------
command: testng ExpectContinueTest
reason: User specified action: run testng/othervm ExpectContinueTest
started: Mon May 08 16:36:24 UTC 2023
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules java.base,java.net.http,java.logging,jdk.httpserver --add-exports java.base/sun.net.www.http=ALL-UNNAMED --add-exports java.base/sun.net.www=ALL-UNNAMED --add-exports java.base/sun.net=ALL-UNNAMED --add-exports java.net.http/jdk.internal.net.http.common=ALL-UNNAMED --add-exports java.net.http/jdk.internal.net.http.frame=ALL-UNNAMED --add-exports java.net.http/jdk.internal.net.http.hpack=ALL-UNNAMED
Timeout information:
--- Timeout information end.
finished: Mon May 08 16:45:08 UTC 2023
elapsed time (seconds): 524.099
----------configuration:(9/500)----------

<snip>

----------System.out:(12/1014)----------
Http1TestServer[localhost/127.0.0.1:43141]::addHandler ExpectContinueTest$GetHandler@2ca68486, /http1/get
Http1TestServer[localhost/127.0.0.1:43141]::addHandler ExpectContinueTest$PostHandler@20a60235, /http1/post
Http2TestServerImpl[localhost/127.0.0.1:49635]::addHandler ExpectContinueTest$GetHandler@4d1cba64, /http2/get
Http2TestServerImpl[localhost/127.0.0.1:49635]::addHandler ExpectContinueTest$PostHandler@34a40825, /http2/post
Http2TestServerImpl[localhost/127.0.0.1:49635]::addHandler ExpectContinueTest$PostHandlerCantContinue@6ee68253, /http2/hang
Http1TestServer: start
Http2TestServerImpl: start
config ExpectContinueTest.setup(): success
test ExpectContinueTest.test(java.net.URI@7d787284, java.net.URI@709979f0, java.net.URI@75a9758f, HTTP_1_1): success
Http2TestContext::handle Http2TestExchangeImpl: jdk.httpclient.test.lib.http2.Http2TestExchangeImpl@388f8a00
Http2TestContext::handle Http2TestExchangeImpl: jdk.httpclient.test.lib.http2.Http2TestExchangeImpl@614b9511
Timeout refired 480 times
<continued in the next comment>