On Wed, 2019-02-06 at 12:25 +0530, Santhosh Kumar wrote:
> HI I m trying to write a client that makes http2 request to multiple
> servers(which already supports http2). so far I have written this
> standalone program which works fine that I can see all requests goes
> via
> same tcp connection(verified with the help of wireshark). I use
> Apache
> Httpclient 5 with conscrypt to support ALPN in jdk8 (jdk8 is my
> requirement, I cannot upgrade to jdk9 or later)
>
> The Main block goes like,
>
> try {
> TrustManager[] trustAllCerts = new TrustManager[]{
> new X509TrustManager(){
> public X509Certificate[] getAcceptedIssuers(){ return
> null; }
> public void checkClientTrusted(X509Certificate[] certs,
> String authType) {}
> public void checkServerTrusted(X509Certificate[] certs,
> String authType) {}
> }
> };
> Provider provider = Conscrypt.newProvider();
>
> SSLContext sslContext = SSLContext.getInstance("TLSv1.3",
> provider);
> sslContext.init(null, trustAllCerts, new SecureRandom());
>
> client = Http2AsyncClientBuilder.create().setTlsStrategy(new
> ConscryptClientTlsStrategy(sslContext)).setH2Config(H2Config.DEFAULT)
> .build();
> client.start();
>
> ThreadPoolExecutor tpe =
> (ThreadPoolExecutor)Executors.newFixedThreadPool(50);
> for (int i=0; i < 50; i++) {
> Runnable worker = new WorkerClass(client, i);
> tpe.execute(worker);
> }} catch (Exception e) {
> e.printStackTrace();}
>
> The runnable goes like,
>
> static class WorkerClass implements Runnable {
> CloseableHttpAsyncClient client = null;
> int i = 0;
> WorkerClass(CloseableHttpAsyncClient client, int i) {
> this.client = client;
> this.i = i;
> }
> public void run() {
> RequestConfig requestConfig = RequestConfig.custom()
> .setConnectTimeout(Timeout.of(15,
> TimeUnit.SECONDS))//Determines the timeout until a new connection is
> fully established.
> .setConnectionRequestTimeout(Timeout.of(60,
> TimeUnit.SECONDS))//Returns the connection lease request timeout used
> when requesting a connection from the connection manager.
> .setResponseTimeout(Timeout.of(60,
> TimeUnit.SECONDS))//Determines the timeout until arrival of a
> response
> from the opposite endpoint.
> .build();
>
> String url =
> "https://localhost:8081/myagent/getOutput?"+System.currentTimeMillis(
> );
> String cachedXMLRequest = "<?xml version=\"1.0\"
> standalone=\"no\"?><My XML REQUEST GOES HERE>";
> SimpleHttpRequest request=
> SimpleHttpRequests.POST.create(url);
> request.setBodyText(cachedXMLRequest,
> ContentType.APPLICATION_JSON);
> request.setConfig(requestConfig);
> final CountDownLatch latch = new CountDownLatch(1);
> client.execute(request, new
> FutureCallback<SimpleHttpResponse>() {
> @Override
> public void cancelled() {
> System.out.println("Cancelled");
> latch.countDown();
> }
>
> @Override
> public void completed(SimpleHttpResponse arg0) {
> System.out.println("Completed "+arg0.getBodyText());
> latch.countDown();
> }
>
> @Override
> public void failed(Exception exception) {
> System.out.println("Failed ");
> exception.printStackTrace();
> latch.countDown();
> }
> });
>
> try {
> latch.await(60, TimeUnit.SECONDS);
> } catch (InterruptedException e) {
> // TODO Auto-generated catch block
> e.printStackTrace();
> }
> }}
>
> So I simulated this standalone in my client which asynchronously
> calls
> multiple servers for polling using the above logic. But here I can
> see one
> tcp connection per request and the connection is closed at the end of
> the
> request(Though the response header returns as HTTP/2.0). I use the
> main
> block code to initialize the client at the startup of my application
> and
> create the url, request and response objects and execute each request
> simultaneously in a threaded model(Asynchronous multiplexing). My
> requirement is to use one tcp connection per domain and use it for
> prolonged time for handling high number of requests. What am I
> missing here?
>
> Or someone hep me with the proper way fo handling http2 using
> httpclient 5
>
> Kindy shed some light on it.
>
> SO link :
>
https://stackoverflow.com/questions/54548110/how-to-do-http2-correctly-with-apache-httpcient-5-beta
>
>
> TIA
>
What is exactly the problem you are having? Is it that connections get
closed after each message exchange? If so, please post wire log of the
session
hc.apache.org/httpcomponents-client-5.0.x/logging.html
Oleg
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