node: basic static http server.

basic-static-http-server.js

var http = require('http');
var url = require('url');
var mime = require('mime');
var fs = require('fs');

var port = process.env.PORT || 40000;
http.createServer(function(req, res) {
  var u = url.parse(req.url);
  var filename = __dirname + '/static' + u.pathname;
  fs.exists(filename, function(exists) {
    if (!exists) {
      res.writeHead(404, {'Content-Type': 'text/plain'});
      return res.end();
    }

    res.setHeader("Content-Type", mime.lookup(filename));
    fs.createReadStream(filename).pipe(res);
  });
}).listen(port);
console.log('listening on port:', port);