[undertow-dev] Embedded undertow and atmosphere framework websockets

Hi, I'm struggling to make simple chat atmosphere application to work with embedded undertow. The app seems to connect to websocket, and requests are passing through to AtmosphereHandler but response never reaches client. I suppose that I'm missing something in my undertow configuration but don't know what. Same code works when dropped into Tomcat or Jetty. Here is my bootstrap class: public class Bootstrap { public static void main(String[] args) throws Exception { // deploy to undertow DeploymentInfo servletBuilder = Servlets.deployment() .setClassLoader(Bootstrap.class.getClassLoader()) .setContextPath("") .setDeploymentName("chat") .setDefaultEncoding("UTF-8") .setUrlEncoding("UTF-8") .setResourceManager(new FileResourceManager(new File(""), 0)) .addWelcomePage("index.html"); servletBuilder.addServlet(Servlets.servlet("AtmosphereServlet", AtmosphereServlet.class) .addInitParam("org.atmosphere.cpr.AtmosphereHandler", "org.atmosphere.samples.chat.Chat") .addMapping("/chat/*") .setAsyncSupported(true)); final WebSocketDeploymentInfo webSocketDeploymentInfo = new WebSocketDeploymentInfo(); servletBuilder.addServletContextAttribute(WebSocketDeploymentInfo.ATTRIBUTE_NAME, webSocketDeploymentInfo); DeploymentManager manager = Servlets.defaultContainer().addDeployment(servletBuilder); manager.deploy(); HttpHandler servletHandler = manager.start(); PathHandler path = Handlers.path(Handlers.redirect("/")).addPrefixPath("/", servletHandler); Undertow server = Undertow.builder() .addHttpListener(8080, "0.0.0.0") .setHandler(path) .build(); server.start(); } } Does anyone know how to properly configure websockets support so that it works with Atmosphere Framework? Complete example can be seen here: https://github.com/djotanov/atmosphere-undertow Regards, Dragan