如何在两个节点js服务器之间通信？

Question

我有两个文件，一个是server.js，另一个是server2.js。 两者都有运行在具有不同端口的服务器实例。

Server.js代码：***

var http = require("http");
                    http.createServer(function (req, res) {
                      console.log("server running at 8080");
                      res.writeHead(200);
                      res.write("hello from server running at 8080");
                      res.end();
                    }).listen(8080);

---

Server2.js：***

var http = require("http");
http.createServer(function (req, res) {
    console.log("server running at 8080");
    res.writeHead(200);
res.write("hello from server running at 8084");
res.end();
}).listen(8084);

---