Node.js http response serve image file

var fs = require('fs');
var fileName = "hello.html";
var http = require('http');
var url = require('url');
var path = require('path');
var mimeTypes = {
  '.js' : 'text/javascript',
  '.html' : 'text/html',
  '.css' : 'text/css',
  '.jpg' : 'image/text',
  '.gif' : 'image/gif'
};
var server = http.createServer(function onRequest (request, response) {
  var pathname = url.parse(request.url).path;
  if(pathname == '/'){
    pathname = '/index.html';
  }/* w w  w .j  a  va 2 s.co  m*/
  var extname = path.extname(pathname);
  console.log(extname);
  var mimeType = mimeTypes[path.extname(pathname)];
  pathname = pathname.substring(1, pathname.length);
  if ((extname == ".gif") || (extname == ".jpg")){
    var img = fs.readFileSync('./' + pathname);
    response.writeHead(200, {'ContentType': mimeType });
    response.end(img, 'binary');
  } else {
    fs.readFile(pathname, "utf8", function(err, data){
      if (err){
        console.log('Could not find or open file ' + pathname + ' for reading\n');
      } else {
        console.log(pathname + " " + mimeType);
        response.writeHead(200, {"Content-Type": mimeType});
        response.end(data);
      }  

    })
  }
})
server.listen(8080);
console.log('Server is listened port:8080');