测量请求成功时 DNS 花费的时间
\Measuring how long the DNS takes when the request is successful
'use strict';
const { PerformanceObserver } = require('node:perf_hooks');
const dns = require('node:dns');
const obs = new PerformanceObserver((items) => {
items.getEntries().forEach((item) => {
console.log(item);
});
});
obs.observe({ entryTypes: ['dns'] });
dns.lookup('localhost', () => {});
dns.promises.resolve('localhost');