title: localhost:8888/ downloads a file
body: <p>I'm trying to learn node.js. I made a http server:</p>
  
  <pre><code> http.createServer(function(request, response) {
    response.writeHead(200, {"Content-Type": "test/html"});
    response.write("Hello World");
    response.end();
    }).listen(8888);
  </code></pre>
  
  <p>When I go to localhost:8888/, the page suppose to say "Hello World" but instead, a files download that has "Hello World" in it. Is this what is suppose to happen?</p>