URL에 포함된 id/pw 를 fetch 함수로 보내기

https://user01:password01@somesite.com

const url = 'https://somesite.com'
const user = 'use01'
const password = 'password01'

const headers = new Headers()
headers.append('Authorization', 'Basic ' + btoa(user + ':' + password))
fetch(url, {headers}).then(res => res.json())