learnyounode/exercises/http_file_server/solution/solution.js

Learn You The Node.js For Much Win! An intro to Node.js via a set of self-guided workshops.

var http = require('http')
var fs = require('fs')

var server = http.createServer(function (req, res) {
  res.writeHead(200, { 'content-type': 'text/plain' })

  fs.createReadStream(process.argv[3]).pipe(res)
})

server.listen(Number(process.argv[2]))