HTTP/1.0 connection persistence is broken

public class TestHTTP
{
    public static void main(final String[] args) throws Exception
    {
        URI uri = new URI("http://127.0.0.1:8000/crls/test-ca-no-next-update.crl");

        CloseableHttpAsyncClient client = HttpAsyncClients.createDefault();

        client.start();

        try {
            SimpleHttpRequest request = SimpleRequestBuilder.get(uri).build();

            SimpleRequestProducer requestProducer = SimpleRequestProducer.create(request);
            SimpleResponseConsumer responseConsumer = SimpleResponseConsumer.create();

            FutureCallback<SimpleHttpResponse> callback = new FutureCallback<SimpleHttpResponse>()
            {
                @Override
                public void completed(final SimpleHttpResponse response) {
                    System.out.println("************** completed");
                    System.out.println(request + "->" + new StatusLine(response));
                    System.out.println(response.getBody());
                }

                @Override
                public void failed(final Exception ex) {
                    System.out.println("************** failed");
                    System.out.println(request + "->" + ex);
                }

                @Override
                public void cancelled() {
                    System.out.println("************** canceled");
                    System.out.println(request + " cancelled");
                }
            };

            for (int i = 0; i < 10000; i++)
            {
                System.out.println("Request: " + i);

                Future<SimpleHttpResponse> future = client.execute(
                        requestProducer,
                        responseConsumer,
                        callback);

                future.get();

                //if sleep is enabled, no exception will be thrown
                //Thread.sleep(1);
            }
        }
        catch (ExecutionException e) {
            e.printStackTrace();
        }
        finally {
            client.close(CloseMode.GRACEFUL);
        }
    }
}

python3 -m http.server