Node.js http response set mime type

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 (request, response) {
  var pathname = url.parse(request.url).pathname;
  console.log('Request ' + pathname);
  console.log("HTTP works!");
  fs.readFile(fileName, "utf8", function(err, data){
    if (err){/*from w w  w. ja v  a  2  s.  c o  m*/
      console.log('Could not find or open file for reading\n');
    } else {
      response.writeHead(200, {"Content-Type": mimeTypes[path.extname(pathname)]});
      response.end(data);
    }
  })
});
server.listen(8080);
console.log('Server is listened port:8080');