[Ionic 4] API Calls Progress Bar loading

Ionic Framework
1

How to show progress bar during loading when loading data from API?

Thanks.

2 
http.request(req).subscribe(event => {
  // Via this API, you get access to the raw event stream.
  // Look for upload progress events.
  if (event.type === HttpEventType.UploadProgress) {
    // This is an upload progress event. Compute and show the % done:
    const percentDone = Math.round(100 * event.loaded / event.total);
    console.log(`File is ${percentDone}% uploaded.`);
  } else if (event instanceof HttpResponse) {
    console.log('File is completely uploaded!');
  }
});

Try this might be this will help

3

What do I need to replace UploadProgress?

4

Here you will get this
https://angular.io/api/common/http/HttpEventType