nodejs simple http server for static files

server.js

var sys = require('sys'),
    my_http = require('http'),
    path = require('path'),
    url = require('url'),
    filesys = require('fs');

my_http.createServer(
  function(request,response){
    var my_path = url.parse(request.url).pathname;
    var full_path = path.join(process.cwd(),my_path);
    path.exists(full_path,function(exists){
      if(!exists){
        response.writeHeader(404, {'Content-Type': 'text/plain'});
        response.write('404 Not Found\n');
        response.end();
      }
      else{
        filesys.readFile(full_path, 'binary', function(err, file) {
          if(err) {
            response.writeHeader(500, {'Content-Type': 'text/plain'});
            response.write(err + '\n');
            response.end();

          }
          else{
            var f = function() {
              response.writeHeader(200, {'Content-Type': 'text/html'});
              response.write(file);
              response.end();
            }
            setTimeout(f, 500 + (Math.random() * 1000));
          }

        });
      }
    });
  })
  .listen(9898);