public static RestClient client(String url) {
 HttpClient.Builder httpBuilder = HttpClient.newBuilder()
 .connectTimeout(Duration.ofSeconds(3))
 .version(HttpClient.Version.HTTP_1_1);
 JdkClientHttpRequestFactory factory = new JdkClientHttpRequestFactory(httpBuilder.build());
 factory.setReadTimeout(Duration.ofSeconds(3));
 return RestClient.builder()
 .baseUrl(url)
 .defaultHeader(HttpHeaders.CONNECTION, "closed")
 .defaultHeader(HttpHeaders.CONTENT_TYPE, "application/json; charset=utf-8")
 .requestFactory(factory)
 .build();
}
public static void main(String[] args) throws InterruptedException {
 String url = "server.url";
 RestClient client = client(url);
 final ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor(r -> {
 Thread thread = new Thread(r, "node-health-issuer");
 thread.setDaemon(true);
 return thread;
 });
 executor.scheduleWithFixedDelay(() -> {
 try {
 ResponseEntity<Void> responseEntity = client.post().uri("readyz")
 .retrieve()
 .toBodilessEntity();
 } catch (Exception e) {
 e.printStackTrace();
 }
 }, 0, 10, TimeUnit.SECONDS);
 Thread.sleep(60 * 1000);
}

org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://192.1.1.1:11111/readyz": Invalid status line: " 200 OK"
 at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.createResourceAccessException(DefaultRestClient.java:697)
 at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.exchangeInternal(DefaultRestClient.java:582)
 at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.exchange(DefaultRestClient.java:533)
 at org.springframework.web.client.RestClient$RequestHeadersSpec.exchange(RestClient.java:680)
 at org.springframework.web.client.DefaultRestClient$DefaultResponseSpec.executeAndExtract(DefaultRestClient.java:814)
 at org.springframework.web.client.DefaultRestClient$DefaultResponseSpec.toBodilessEntity(DefaultRestClient.java:792)
 at cn.keyou.cmas.entity.monitored.application.health.HealthScheduler.healthLine(HealthScheduler.java:94)
 at cn.keyou.cmas.entity.monitored.application.health.HealthScheduler.lambda$metric2ドル(HealthScheduler.java:77)
 at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
 at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
 at java.base/java.lang.VirtualThread.run(Unknown Source)
Caused by: java.net.ProtocolException: Invalid status line: " 200 OK"
 at java.net.http/jdk.internal.net.http.Http1HeaderParser.protocolException(Unknown Source)
 at java.net.http/jdk.internal.net.http.Http1HeaderParser.readStatusLineFeed(Unknown Source)
 at java.net.http/jdk.internal.net.http.Http1HeaderParser.parse(Unknown Source)
 at java.net.http/jdk.internal.net.http.Http1Response$HeadersReader.handle(Unknown Source)
 at java.net.http/jdk.internal.net.http.Http1Response$HeadersReader.handle(Unknown Source)
 at java.net.http/jdk.internal.net.http.Http1Response$Receiver.accept(Unknown Source)
 at java.net.http/jdk.internal.net.http.Http1Response$HeadersReader.tryAsyncReceive(Unknown Source)
 at java.net.http/jdk.internal.net.http.Http1AsyncReceiver.flush(Unknown Source)
 at java.net.http/jdk.internal.net.http.common.SequentialScheduler$LockingRestartableTask.run(Unknown Source)
 at java.net.http/jdk.internal.net.http.common.SequentialScheduler$CompleteRestartableTask.run(Unknown Source)
 at java.net.http/jdk.internal.net.http.common.SequentialScheduler$SchedulableTask.run(Unknown Source)
 at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
 at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
 at java.base/java.lang.Thread.run(Unknown Source)

tcp6 0 0 <local-address> <A-address> ESTABLISHED

tcp6 0 0 <local-address1> <B-address> ESTABLISHED
tcp6 0 0 <local-address2> <B-address> ESTABLISHED
tcp6 0 0 <local-address3> <B-address> ESTABLISHED
tcp6 0 0 <local-address4> <B-address> ESTABLISHED