index.js

const express = require('express')
const path = require('path')
const app = express()
const port = 7860

app.use(express.static(path.join(__dirname, 'public')));

app.get('/dl/GrowLauncher.apk', (req, res) => {
  res.download(path.join(__dirname, 'GrowLauncher.apk'))
})

app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}`)
})