In previous Atmosphere tests with undertow beta20, attempting to connect using websocket transport failed, then fell back successfully to long-polling. In latest test with undertow beta23, websocket transport now works correctly, but attempting to connect using long-polling transport now results in the following error:

2013-11-17 21:57:32,857 ERROR [org.atmosphere.cpr.AtmosphereFramework] (default task-6) AtmosphereFramework exception: java.lang.IllegalStateException: UT010026: Async is not supported for this request, as not all filters or Servlets were marked as supporting async
at io.undertow.servlet.spec.HttpServletRequestImpl.startAsync(HttpServletRequestImpl.java:909) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at org.atmosphere.cpr.AtmosphereRequest.startAsync(AtmosphereRequest.java:503) [atmosphere-runtime-2.0.3.jar:2.0.3]
at org.atmosphere.container.Servlet30CometSupport.suspend(Servlet30CometSupport.java:128) [atmosphere-runtime-2.0.3.jar:2.0.3]
at org.atmosphere.container.Servlet30CometSupport.service(Servlet30CometSupport.java:103) [atmosphere-runtime-2.0.3.jar:2.0.3]
at org.atmosphere.cpr.AtmosphereFramework.doCometSupport(AtmosphereFramework.java:1684) [atmosphere-runtime-2.0.3.jar:2.0.3]
at org.atmosphere.cpr.AtmosphereServlet.doPost(AtmosphereServlet.java:198) [atmosphere-runtime-2.0.3.jar:2.0.3]
at org.atmosphere.cpr.AtmosphereServlet.doGet(AtmosphereServlet.java:184) [atmosphere-runtime-2.0.3.jar:2.0.3]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final]
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:87) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:130) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:114) [undertow-websockets-jsr-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:56) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:85) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:59) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:81)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:113) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.security.handlers.AuthenticationCallHandler.handleRequest(AuthenticationCallHandler.java:52) [undertow-core-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:45) [undertow-core-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:65) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:70) [undertow-core-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:25) [undertow-core-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:239) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:226) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:72) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:145) [undertow-servlet-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:139) [undertow-core-1.0.0.Beta23.jar:1.0.0.Beta23]
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:637) [undertow-core-1.0.0.Beta23.jar:1.0.0.Beta23]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_17]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_17]
at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_17]