title: How to create a Node.js API that can send progress indication data to the front view?
body: <p>I'm working on a MEAN project as my hobby. I use Node.js as the back end and Angular.js as the front end. Node.js will execute a long lasting task (it takes about 30 minutes to execute this task), I want to display the task status on the view page. How can I achieve this?  </p>