Node.js 14 download to file via proxy

proxy_download_to_file.js

require('dotenv').config()
const { URL } = require('url');
const http = require('http')
const https = require('https')
const yaml = require('js-yaml')
const fs = require('fs')
const config = yaml.load(fs.readFileSync(process.env.CONFIG_FILE, 'utf8'))

const download_to_file = (url, dest_path, callback) => {
    const file = fs.createWriteStream(dest_path)
    let options = {}
    options.minVersion = "TLSv1.2"
    options.maxVersion = "TLSv1.3"
    options.host = (new URL(url)).hostname
    options.path = (new URL(url)).pathname
    const handler = res => {
        res.pipe(file)
        file.on('finish', () => file.close(callback))
    }
    const err_handler = err => {
        console.warn(err)
    }
    if ('proxy' in config.app) {
        options.host = config.app.proxy.host
        options.port = config.app.proxy.port
        options.path = url
        options.headers = {
            Host: new URL(url).hostname,
            // 'Proxy-Authorization': 'Basic ' + new Buffer(`${username}:${password}`).toString('base64')
        }
        http.get(options, handler).on('error', err_handler).end()
    } else if (url.startsWith('https')) {
        https.get(options, handler).on('error', err_handler).end()
    } else if (url.startsWith('http')) {
        http.get(options, handler).on('error', err_handler).end()
    }
}

The .env example

CONFIG_FILE=config.yaml

The package.json example

{
    "name": "",
    "version": "0.0.1",
    "dependencies": {
        "js-yaml": "^3.13.1",
        "dotenv": "^8.2.0"
    },
    "author": "",
    "license": "ISC"
}

The config.yaml example

---
app:
  proxy:
    host: proxy.trivialsec.local
    port: 3128
    username: squid
    password: "should be stored in a vault and not here in plain text"