Node override request IP resolution

Question

I'm struggling to find the correct terminology to accurately phrase this problem, but I'm gonna give it my best shot:

In node.js, is there a way to manually override the IP address when making an HTTP request (e.g. request some-domain.com/whatever and instead of resolving the IP address through DNS, manually provide some IP address 1.2.3.4) ?

This would, effectively speaking, be the equivalent of setting 1.2.3.4 some-domain.com in /etc/hosts

Answer 1

There is a tiny module that does exactly that: evil-dns.

evilDns.add('foo.com', '1.2.3.4');

Answer 2

Node's http and https modules take an Agent as an argument, and you can override the dns resolver with the lookup parameter.

const http = require("http");
const https = require("https");


const staticLookup = (ip, v) => (hostname, opts, cb) => cb(null, ip, v || 4)
const staticDnsAgent = (scheme, ip) => new require(scheme).Agent({lookup: staticLookup(ip)})

http.get("http://some-domain.com/whatever", {agent: staticDnsAgent('http', '1.2.3.4')})