learnyounode/exercises/http_uppercaserer/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 map = require('through2-map')

var server = http.createServer(function (req, res) {
  if (req.method !== 'POST') {
    return res.end('send me a POST\n')
  }

  req.pipe(map(function (chunk) {
    return chunk.toString().toUpperCase()
  })).pipe(res)
})

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