text: 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]))