Read file in node.js

file.js

var http = require('http'),
    fs   = require('fs'), 
    step = require('step');
	
var file_path = __dirname + '/SCAN0004.JPG';
var file_size, file_content;

step(

 function get_file_size() {
  fs.stat(file_path, this);
  }, 

  function store_file_size(err, stat) {
   file_size = stat.size;
   this();
  },

  function read_file_into_memory() {
   fs.readFile(file_path, this);
  },

  function createServer(err, file_content) {
   http.createServer(function(request, response) {
   
   response.writeHead(200, {
    'Content-Type': 'image/jpeg',
    'Content-Length': file_size 
   });

   response.end(file_content);
  	
   }).listen(4000);
 });


fs.stat(file_path, function(err, stat) {
 
 var file_size = stat.size;
 
 fs.readFile(file_path, function(err, file_content) {
  if (err) throw err;
  
 });	
});