Express.js-为什么是Localhost'::'

Question

任何人都可以告诉我为什么我的服务器地址(主机)是::而不是localhost

var express = require('express');
var app = express();

// respond with "hello world" when a GET request is made to the homepage
app.get('/', function(req, res) {
  res.send('hello world');
});

var server = app.listen(3000, function () {
  var host = server.address().address;
  var port = server.address().port;
  console.log('Example app listening at http://%s:%s', host, port);
});

这回来了

Example app listening at http://:::3000

当我去http:// localhost:3000 /时,它工作正常

Answer 1

因为::在使用IPv6时是localhost,就像IPv4中的127.0.0.1一样.