simple static handler in nodejs

static.js

const http = require('http')
const fs = require('fs')
const mime = require('mime')

const server = http.createServer().listen(3000)

server.on('request', (req, res)=>{
   const filePath =  __dirname + req.url

   fs.stat(filePath, (err, stat)=>{
      if(err || !stat.isFile()){
         res.writeHead(404)
         res.write('File Not Found')
         res.end()
         return
      }

      res.setHeader('Content-Type', mime.lookup(filePath))
      const file =  fs.createReadStream(filePath)

      file.on('open', ()=>{
         res.statusCode = 200
         file.pipe(res)
      })

      file.on('error', ()=>{
         res.statusCode =  403
         res.write('Permission Denied.')
         res.end()
      })
   })
})