Examples of io.vertx.core.http.HttpServer.requestHandler()

io.vertx.core.http.HttpServer.requestHandler()
Set the request handler for the server to {@code requestHandler}. As HTTP requests are received by the server, instances of {@link HttpServerRequest} will be created and passed to this handler. @return a reference to this, so methods can be chained.

    HttpServer[] servers = new HttpServer[numServers];
    CountDownLatch startServerLatch = new CountDownLatch(numServers);
    Set<HttpServer> connectedServers = new ConcurrentHashSet<>();
    for (int i = 0; i < numServers; i++) {
      HttpServer server = vertx.createHttpServer(new HttpServerOptions().setHost(DEFAULT_HTTP_HOST).setPort(DEFAULT_HTTP_PORT));
      server.requestHandler(req -> {
        connectedServers.add(server);
        req.response().end();
      });
      server.listen(ar -> {
        assertTrue(ar.succeeded());

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    testStore(serverOptions, expectedMessage);
  }


  private void testStore(HttpServerOptions serverOptions, String expectedMessage) {
    HttpServer server = vertx.createHttpServer(serverOptions);
    server.requestHandler(req -> {
    });
    try {
      server.listen();
      fail("Was expecting a failure");
    } catch (VertxException e) {

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    Set<Context> contexts = new ConcurrentHashSet<>();
    for (int i = 0; i < numServers; i++) {
      HttpServer theServer = vertx.createHttpServer(new HttpServerOptions().setPort(DEFAULT_HTTP_PORT));
      servers.add(theServer);
      final AtomicReference<Context> context = new AtomicReference<>();
      theServer.requestHandler(req -> {
        Context ctx = vertx.context();
        if (context.get() != null) {
          assertSame(ctx, context.get());
        } else {
          context.set(ctx);

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  @Test
  public void testSharedServersRoundRobinWithOtherServerRunningOnDifferentPort() throws Exception {
    // Have a server running on a different port to make sure it doesn't interact
    CountDownLatch latch = new CountDownLatch(1);
    HttpServer theServer = vertx.createHttpServer(new HttpServerOptions().setPort(8081));
    theServer.requestHandler(req -> {
      fail("Should not process request");
    }).listen(onSuccess(s -> latch.countDown()));
    awaitLatch(latch);


    testSharedServersRoundRobin();

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  @Test
  public void testSharedServersRoundRobinButFirstStartAndStopServer() throws Exception {
    // Start and stop a server on the same port/host before hand to make sure it doesn't interact
    CountDownLatch latch = new CountDownLatch(1);
    HttpServer theServer = vertx.createHttpServer(new HttpServerOptions().setPort(DEFAULT_HTTP_PORT));
    theServer.requestHandler(req -> {
      fail("Should not process request");
    }).listen(onSuccess(s -> latch.countDown()));
    awaitLatch(latch);


    CountDownLatch closeLatch = new CountDownLatch(1);

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    server.close();
    HttpServerOptions options = new HttpServerOptions().setHost(DEFAULT_HTTP_HOST).setPort(DEFAULT_HTTP_PORT);
    HttpServer server = vertx.createHttpServer(options);
    // Now change something - but server should still listen at previous port
    options.setPort(DEFAULT_HTTP_PORT + 1);
    server.requestHandler(req -> {
      req.response().end();
    });
    server.listen(ar -> {
      assertTrue(ar.succeeded());
      client.request(HttpMethod.GET, DEFAULT_HTTP_PORT, DEFAULT_HTTP_HOST, "/uri", res -> {

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public class SimpleServer extends AbstractVerticle {


  @Override
  public void start(Future<Void> startFuture) throws Exception {
    HttpServer server = vertx.createHttpServer(new HttpServerOptions().setPort(8080));
    server.requestHandler(req -> req.response().end());
    server.listen(res -> {
      if (res.succeeded()) {
        startFuture.complete();
      } else {
        startFuture.fail(res.cause());

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