请问koa2如何实现socket.io？ #22
Description
我代码是这样的：
const Koa = require('koa');
const app = new Koa();
const server = require('http').Server(app.callback());
const io = require('socket.io')(server);
io.on('connection', function(socket){
io.emit('this', { will: 'be received by everyone'});
socket.on('private message', function (from, msg) {
console.log('I received a private message by ', from, ' saying：', msg);
});
socket.on('disconnect', function () {
io.emit('user disconnected');
});
});但是前端请求的时候找不到数据，该如何做呢，希望提供ko2的一些源码。