basics example: wrong index.html or the proper handler is missing

[EasyToFindName]

The index.html in the "basics" example contains a chat form which trying to establish a websocket connection using the following url: "127.0.0.1:8080/ws" when I click the "Connect" button, but in the main.rs there is no resource named "/ws" and the ws module even isn't imported. So I get an "Error during WebSocket handshake: Unexpected response code: 404" and can't do anything useful with this chat window.