WebGL Build : Download file from Web-Service

Hello,
I am developing a WebGL application with Unity. I want to download a file from a remote web-service to by using WebGL application to user’s local machine. Is it possible ?
I’ve tried using WWW class to send the download request, when I get the response, I’ve tried to write it to a file. This works on Unity Editor version. However WebGL build does not save anything to anywhere with this way. How can this be achieved ?

Thanks in advance.

By using layer of js outside of unity which will be connected to unity code via Unity - Manual: Interaction with browser scripting and then just opening in this js separate tab with link for file so it can be downloaded to user’s pc