While investigating AGPUSH-337 we noticed that there is a bug in the version of Netty that it is using. The issue is that the wrong HTTP chunk delimiter was been written and this caused the node-web-proxy on OpenShift to fail to support streaming protocols.

The current version of Netty for 0.8.1 is a version that is built manually which contains the SockJS support we require. This has since been included into aerogear-simplepush-server which makes things easier and will later be included in Netty as well.
For now we should update the Netty version that we are using and update the OpenShift cartridge. When AGPUSH-337 is available on OpenShift the xhr_streaming protocol should work in combination with the proxy.