Extjs 4 custom proxy server for sharing over the Internet

Question

I have an ExtJS 4 MVC application and a websocket channel with Socket.IO as the main transport layer (static files served by nginx and all data transfer through websocket | json | rpc).

So, I want all proxy requests to be sent to my websocket channel. Extjs does not have a built-in proxy for this.

What is the best way to do this? Create your own proxy class or use an existing (e.g. memory) and interception request in event handlers?