Extract from the log:

...

FINE [Feb 24, 8:57:20.620455000] sun.net.httpserver.ServerImpl$Exchange run: Exchange request line: POST /foo/ HTTP/1.1
FINE [Feb 24, 8:57:20.622015000] sun.net.httpserver.ServerImpl logReply: POST /foo/ HTTP/1.1 [200 OK] ()
FINE [Feb 24, 8:57:20.630632000] sun.net.httpserver.ServerImpl$Exchange run: Exchange request line: POST /foo/ HTTP/1.1
FINE [Feb 24, 8:57:20.632156000] sun.net.httpserver.ServerImpl logReply: POST /foo/ HTTP/1.1 [200 OK] ()
FINE [Feb 24, 8:57:20.639300000] sun.net.httpserver.ServerImpl$Exchange run: no request line: closing
java.lang.RuntimeException: Unexpected exception: java.io.IOException: HTTP/1.1 header parser received no bytes
at DigestEchoClient.testBasic(DigestEchoClient.java:455)
at DigestEchoClient.main(DigestEchoClient.java:281)
at ProxyAuthDisabledSchemes.main(ProxyAuthDisabledSchemes.java:54)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.io.IOException: HTTP/1.1 header parser received no bytes
at java.net.http/jdk.internal.net.http.common.Utils.wrapWithExtraDetail(Utils.java:304)
at java.net.http/jdk.internal.net.http.Http1Response$HeadersReader.onReadError(Http1Response.java:665)
at java.net.http/jdk.internal.net.http.Http1AsyncReceiver.checkForErrors(Http1AsyncReceiver.java:297)
at java.net.http/jdk.internal.net.http.Http1AsyncReceiver.flush(Http1AsyncReceiver.java:263)
at java.net.http/jdk.internal.net.http.common.SequentialScheduler$SynchronizedRestartableTask.run(SequentialScheduler.java:175)
at java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(SequentialScheduler.java:147)
at java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:198)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
... 1 more
Caused by: java.io.IOException: connection closed locally
at java.net.http/jdk.internal.net.http.SocketTube.signalClosed(SocketTube.java:157)
at java.net.http/jdk.internal.net.http.PlainHttpConnection.close(PlainHttpConnection.java:277)
at java.net.http/jdk.internal.net.http.ConnectionPool.cleanup(ConnectionPool.java:479)
at java.net.http/jdk.internal.net.http.ConnectionPool$CleanupTrigger.triggerCleanup(ConnectionPool.java:502)
at java.net.http/jdk.internal.net.http.ConnectionPool$CleanupTrigger.onNext(ConnectionPool.java:518)
at java.net.http/jdk.internal.net.http.ConnectionPool$CleanupTrigger.onNext(ConnectionPool.java:487)
at java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$InternalReadSubscription.read(SocketTube.java:844)
at java.net.http/jdk.internal.net.http.SocketTube$SocketFlowTask.run(SocketTube.java:175)
at java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(SequentialScheduler.java:198)
at java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:271)
at java.net.http/jdk.internal.net.http.common.SequentialScheduler.runOrSchedule(SequentialScheduler.java:224)
at java.net.http/jdk.internal.net.http.SocketTube$InternalReadPublisher$InternalReadSubscription.handleSubscribeEvent(SocketTube.java:690)
at java.net.http/jdk.internal.net.http.AsyncTriggerEvent.handle(AsyncTriggerEvent.java:54)
at java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.run(HttpClientImpl.java:815)