wsmirror is a simple server application that lets you run Websocket echo server for playing with WebSockets and testing WebSocket client implementations.
It should work similar to like echo.websocket.org worked before.
Usage: wsmirror <tcp_bind_socket_address>
Specify socket address like 127.0.0.1:1234 or [::]:8080 as a sole command line argument.
Other options, such as maximum number of simultaneous clients, are configurable only in source code constants.