Find out when user leaves a page in django

I have an ajax function that sends requests to a Django view every second:

function get_updates() {
    $.ajax({
        url: full_path,
        type: 'GET',
        data: {latest_pk: latest_pk},

        success: function(json) {
            ...
        },

        complete: function(data) {
            setTimeout(get_updates, 1000);
        }
    });
}

get_updates();

get method of the view is like this:

def get(self, request, *args, **kwargs):
    if request.GET:
        # If there are GET parameters, use them to return updates.
        response = self.get_updates(request.GET.get("latest_pk"))
        return JsonResponse(response)
    else:
        # Otherwise if the url is simply requested,
        # return the rendered chat page.
        return super().get(request, *args, **kwargs)

How can I execute some code in Django, after requests stopped being sent? I need to save the time of the last request.

Try this in javascript there is event called ."beforeunload".
This is just an idea how you can achieve it 

<script>
window.addEventListener("beforeunload",function(){
      $.ajax({
        url: full_path,
        type: 'GET',
        data: {latest_pk: latest_pk},

        success: function(json) {
            // add your other logic here
        }
    });
  


});
</script>
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