HttpHandler httpHandler = HttpClient.of(baseUri) .configure( RequestTimeout.ofSeconds(10), ConnectionPoolSettings .connectionPoolSettings() .maxConnections(100) .idleTimeout(Duration.ofMinutes(1)) ); import org.http4k.core.CacheControl; CacheControl cacheControl = CacheControl.CacheControlBuilder.aCacheControl() .withMaxAge(Duration.ofMinutes(10)) .withMustRevalidate(true) .build(); AsyncHttpClient asyncHttpClient = HttpClients.createAsync(); CompletableFuture<Response> future = asyncHttpClient .sendAsync(request, Duration.ofSeconds(10)) .thenApply(Response::new); future.thenAccept(response -> { });