Express.js- 为什么是 localhost '::'

Question

谁能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);
});

返回

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

当我转到http://localhost:3000/时它工作正常

Answer 1

因为 :: 在使用 IPv6 时是 localhost，就像在 IPv4 中是 127.0.0.1。