Some HTTP tests, such as test/jdk/java/net/httpclient/SmokeTest.java, sometimes fail due to an assertion error in the test HttpServer:

java.lang.AssertionError
at jdk.httpserver/sun.net.httpserver.ServerImpl.closeConnection(ServerImpl.java:491)
at jdk.httpserver/sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:669)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:832)