title: How to perform long HTTP requests in expressjs?
body: <p>I wrote an express.js application and one of my GET requests takes a very long time to complete (it runs a spark query on a Hadoop client).<br>
  Because the request takes so much time, the client which performed the request (Chrome, Firefox, jQuery) re-sends the same request to the express.js app again and again.<br>
  Is there a way to handle these recurring requests?</p>