node js server downloads text/html as file on browser

Those of you who work with webserver, like apache, might already have seen that problem – like the php file that was intended to display content would be downloaded as file.. this has some fix on configuration right..
Now coming to node js, once you install the server like

  1 var http_server=require("http");
  2 http_server.createServer(function(request, response){
  3     response.writeHead(200, {'Content-Type': "text/html"});
  4     response.write("I am listening @port 8896");
  5     response.end();
  6 }).listen(8896);

This should run fine once you run node filename.js where filename.js is the file containing the above code.
but, when you try to run by going to localhost:8896 and in place of seeing the text on your browser, if the browser decided to download the file, give a a careful look at line number 3 to be sure that you have specified correct content type..