Client.java

package io.vertx.example.core.http2.customframes;

import io.vertx.core.AbstractVerticle;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.http.HttpClientOptions;
import io.vertx.core.http.HttpClientRequest;
import io.vertx.core.http.HttpVersion;
import io.vertx.core.net.OpenSSLEngineOptions;
import io.vertx.example.util.Runner;

/*
 * @author <a href="http://tfox.org">Tim Fox</a>
 */
public class Client extends AbstractVerticle {

  // Convenience method so you can run it in your IDE
  public static void main(String[] args) {
    Runner.runExample(Client.class);
  }

  @Override
  public void start() throws Exception {

    // Note! in real-life you wouldn't often set trust all to true as it could leave you open to man in the middle attacks.

    HttpClientOptions options = new HttpClientOptions().
        setSsl(true).
        setUseAlpn(true).
        setProtocolVersion(HttpVersion.HTTP_2).
        setTrustAll(true);

    HttpClientRequest request = vertx.createHttpClient(options
    ).get(8443, "localhost", "/");

    request.handler(resp -> {

      // Print custom frames received from server

      resp.customFrameHandler(frame -> {
        System.out.println("Got frame from server " + frame.payload().toString("UTF-8"));
      });
    });

    request.sendHead(version -> {

      // Once head has been sent we can send custom frames

      vertx.setPeriodic(1000, timerID -> {

        System.out.println("Sending ping frame to server");
        request.writeCustomFrame(10, 0, Buffer.buffer("ping"));
      });
    });
  }
}