FEAT - Add public getUndertow method to UndertowWebServer

- getUndertow() to UndertowWebServer will be null until the server has been started. Issue #3016 would enable getUndertow() to behave in a similar way to getTomcat() on TomcatWebServer.

#39839

Signed-off-by: Jakob Wanger <[email protected]>

Author: wanger26

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServer.java

@@ -298,6 +298,14 @@ public int getPort() {
 		return ports.get(0).getNumber();
 	}
 
+	/**
+	 * @return undertow. Note, the return value will be null until the server has been
+	 * started.
+	 */
+	public Undertow getUndertow() {
+		return this.undertow;
+	}
+
 	@Override
 	public void shutDownGracefully(GracefulShutdownCallback callback) {
 		if (this.gracefulShutdown == null) {