koa2获取用户ip

调用下面方法即可获取

// koa2 中 req 为 ctx.req
const getUserIp = (req) => {
  return req.headers['x-forwarded-for'] ||
    req.connection.remoteAddress ||
    req.socket.remoteAddress ||
    req.connection.socket.remoteAddress;
}

websocket 连接时获取

ws.on('connection', function(wsocket) {
    const ip = wsocket._socket.remoteAddress;
})