Angular 2 HTTP Audio

angular2-http-audio.ts

import { Response, RequestOptions, Headers, ResponseContentType } from '@angular/http';
import * as FileSaver from 'file-saver';

/**
  * Get Audio
  *  
  * @returns {Promise<Blob>}
  */
public getAudio(): Promise<Blob> {
  let url = `http://example.com/demo.wav`;
  let headers = new Headers({'Accept': 'audio/wav'});
  let options = new RequestOptions({ headers: headers, responseType: ResponseContentType.Blob });

  return this.http.get(url, options)
    .map((res: Response) => {
      return res.blob();
    })
    .toPromise();
}
    
//---------------------------------------------------------------------

this.exampleService.getAudio().then(blob => {
  let fileName = `demo.wav`;
  if (/MSIE|Trident|Edge/i.test(navigator.userAgent)) {
    window.navigator.msSaveBlob(blob, fileName);
  } else {
    FileSaver.saveAs(blob, fileName);
  }
}).catch(err => {
  // Handle exception
});