The following test will fail:

import static java.net.http.HttpClient.Version.HTTP_2;

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpRequest.BodyPublishers;
import java.net.http.HttpResponse;
import java.net.http.HttpResponse.BodyHandlers;

import org.testng.annotations.Test;

/*
 * @test
 * @compile HttpTestUtils.java
 * @run testng/othervm POSTTest
 */
public class POSTTest {
    @Test
    public void test() throws Exception {
        HttpTestServer server = HttpTestServer.APACHE;
        HttpClient client = HttpTestUtils.clientBuilder(server)
                                         .version(HTTP_2)
                                         .build();

        HttpRequest request = HttpRequest
                .newBuilder(new URI(server.getCgiRoot(
                        HttpTestUtils.Protocol.HTTPS, "maxframesize")))
                .POST(BodyPublishers.ofString("test=123")).build();

        HttpResponse<String> resp = client.sendAsync(request, BodyHandlers.ofString()).get();
        System.out.println(resp.version());
        
        request = HttpRequest
                .newBuilder(new URI(server.getCgiRoot(
                        HttpTestUtils.Protocol.HTTPS, "maxframesize")))
                .POST(BodyPublishers.ofString("test=123")).build();

        resp = client.sendAsync(request, BodyHandlers.ofString()).get();
        System.out.println(resp.version());
        
        request = HttpRequest
                .newBuilder(new URI(server.getCgiRoot(
                        HttpTestUtils.Protocol.HTTPS, "headerresp")))
                .POST(BodyPublishers.ofString("r=02")).build();

        resp = client.sendAsync(request, BodyHandlers.ofString()).get();
        System.out.println(resp.version());
    }
}

with message:
STDOUT:
[TestNG] Running:
  infra/java/net/http/httpclient/POSTTest.java

HTTP_2
test POSTTest.test(): failure
java.util.concurrent.ExecutionException: java.io.IOException: /10.0.2.15:37724: GOAWAY received
at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:395)
at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1999)
at POSTTest.test(POSTTest.java:38)
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:564)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:773)
at org.testng.TestRunner.run(TestRunner.java:623)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
at org.testng.SuiteRunner.run(SuiteRunner.java:259)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
at org.testng.TestNG.run(TestNG.java:1018)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:94)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.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:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.io.IOException: /10.0.2.15:37724: GOAWAY received
at java.net.http/jdk.internal.net.http.Http2Connection.handleGoAway(Http2Connection.java:817)
at java.net.http/jdk.internal.net.http.Http2Connection.handleConnectionFrame(Http2Connection.java:716)
at java.net.http/jdk.internal.net.http.Http2Connection.processFrame(Http2Connection.java:614)
at java.net.http/jdk.internal.net.http.frame.FramesDecoder.decode(FramesDecoder.java:155)
at java.net.http/jdk.internal.net.http.Http2Connection$FramesController.processReceivedData(Http2Connection.java:200)
at java.net.http/jdk.internal.net.http.Http2Connection.asyncReceive(Http2Connection.java:549)
at java.net.http/jdk.internal.net.http.Http2Connection$Http2TubeSubscriber.processQueue(Http2Connection.java:1090)
at java.net.http/jdk.internal.net.http.common.SequentialScheduler$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:1131)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:631)
... 1 more


After the first response is received, HttpClient sends the second, but it only sends the HEADERS frame, not send the DATA frame, so the server reset stream with timeout.