Example custom connect fetch

index.js

const { setGlobalDispatcher, Agent } = require('undici')

setGlobalDispatcher(
  new Agent({
    connect: (opts) => {
      console.log('Called with', opts)
      // implement custom dns lookup
    }
  })
)

fetch('https://example.com')
// ➜  test  node index.js
//Called with {
//  host: 'example.com',
//  hostname: 'example.com',
//  protocol: 'https:',
//  port: '',
//  servername: null,
//  localAddress: null
//}
//