Hi everyone, Undertow 1.4 Final should be released very soon and will be part of Wildfly 10. The main feature that we have added in this release is direct support for ALPN on JDK8 without requiring modification of the boot class path. If anyone who is using HTTP/2 would like to try this out and provide feedback that would be great. The current ALPN solution will continue to be supported, however you will need to set -Dio.undertow.disable-jdk8-alpn=true to disable the new implementation. JDK9 has ALPN support out of the box so this only applies to JDK8. Stuart