Tracking request and response from anchor element

I am developing a web application using angular dart.

I am having an anchor element which, when clicked, hits an URL and downloads a document.

I have defined my anchor element like this:

AnchorElement elemDownloadLink;

And for downloading, i do this:

elemDownloadLink.click();

My problem is I need to know exactly in code when the HTTP response is received and also if the request is successfull.

Is there any event listener to detect the HTTP response status code?

How do I achieve this?