Fix broken docs

Signed-off-by: raccoonback <kosb15@naver.com>

Author: raccoonback

docs/modules/ROOT/pages/http-server.adoc

@@ -747,7 +747,7 @@ To enable *PING* frames for HTTP/2 connections, configure the HttpServer as foll
 
 {examples-link}/liveness/Application.java
 ----
-include::{examples-dir}/liveness/Application.java[lines=23..40]
+include::{examples-dir}/liveness/Application.java[lines=26..50]
 ----
 <1> To set up a health check using HTTP2 Ping frame, `idleTimeout` must be set first.
 <2> Sets the interval for sending `HTTP/2` `PING` frames and receiving `ACK` responses

reactor-netty-examples/src/main/java/reactor/netty/examples/documentation/http/server/liveness/Application.java

@@ -16,23 +16,33 @@
 package reactor.netty.examples.documentation.http.server.liveness;
 
 import reactor.netty.DisposableServer;
+import reactor.netty.http.Http2SslContextSpec;
+import reactor.netty.http.HttpProtocol;
 import reactor.netty.http.server.HttpServer;
 
+import java.io.File;
 import java.time.Duration;
 
 public class Application {
 
 	public static void main(String[] args) {
+		File cert = new File("certificate.crt");
+		File key = new File("private.key");
+
+		Http2SslContextSpec http2SslContextSpec = Http2SslContextSpec.forServer(cert, key);
+
 		DisposableServer server =
 				HttpServer.create()
+						.port(8080)
+						.protocol(HttpProtocol.H2)
+						.secure(spec -> spec.sslContext(http2SslContextSpec))
 						.idleTimeout(Duration.ofSeconds(1)) //<1>
-						.secure()
 						.http2Settings(
 								builder -> builder.pingAckTimeout(Duration.ofMillis(600))  // <2>
 										.pingScheduleInterval(Duration.ofMillis(300))  // <3>
 										.pingAckDropThreshold(2)  // <4>
-						);
-				          .bindNow();
+						)
+						.bindNow();
 
 		server.onDispose()
 				.block();