primarily for eaglercraft, but basically proxies minecraft to http web server and for eaglercraft also creates a websocket for it, all on the same port!!
eagler_only.js is the eagler piece alone, without java forwarding on the same port
https://docs.google.com/document/d/1cvHK_SnNuUgf6RLMoT0fLQGxELqaWrAIzJuxXe6A7wE/edit