title: Download CSV after a POST request
body: <p>How to download a CSV file on a button click which sends a post request.</p>
  
  <p>The post request has a huge response and hence, getting it from express to front end is not a feasible solution.</p>
  
  <p>I want to get the data on express and create and send a csv to the front end which automatically downloads it.</p>
  
  <p>Can somebody help?</p>