WebSockets

Websockets

• npm install --save ws
• Web sockets are bi-directional
• Not fully supported in browsers
• Need a web socket server
• long-lived XHR request
• ws.send, ws.on
• new WebSocket
• Use libraries: socket.io, engine.io, sock.js

Socket.io

io.on("connection", function(socket){
    socket.on("chat message", function(message){
        io.emit("chat message", message);
    });
});

socket.on("chat message", function(message){
});

Primus

• Primus is an abstraction-abstraction

primusServer = new Primus;
primusServer.on("connection", function(socket){
    socket.on("data" function(message){
    });
});