title: Angular fetch data from back-end in separate thread
body: <p>Here's the scenario :
  In two pages : home page and list data page.in order to improve the user experience, in home page, when the user click a button, i have to launch a separate thread in which i fetch data (data are for list data page) from restful api, when data are fetched, i want to show a notification to the user saying that data are ready and he can go to list data page. Due to heavy amount of data, it's not to good to redirect the user to list data page and wait for data to be fetched from back-end.
  I use angular fir front-end and springboot for back-end.
  Note : i have implemented a solution using async functions.. But i need a solution for the described scenario. </p>