If you where running an app that depended on the now defunct
steemd.steemit.com WebSocket RPC you can run a copy of lineman. It will proxy the new
api.steemit.com HTTP RPC to WebSockets for you.
Running in a docker container it is as simple as:
docker run -p 8080:8080 -it jnordberg/lineman
And now you have a steemd.steemit.com replacement running on
ws://<docker-host>:8080 where you can point your app.