stefanpenner/ember-cli — pull request #2510 by xiujunma (2014-11-19 04:46:02+00:00)
Title: Add "ws: true" to create http proxy server option to support proxying websockets.

I have tested, it cannot proxy websockets request to remote server.
According node-http-proxy doc https://github.com/nodejitsu/node-http-proxy#proxying-websockets, I think "ws: true" is required for supporting websocket.