How to get current URL in jinja2/flask (request.url not working)

Is there a way to print the current URL in Jinja2/Flask?

E.g. if the current URL is http://www.domain.com/example/1/2

{{ request.path }} works and prints /example/1/2, but how to I get the full URL with http:// as well?

From the docs (here){{ request.url }} should work, but it doesn't yield anything.

Thanks

UPDATE

Here are the render/context args from views.py:

class EventDetailView(EventObjectMixin, FormView):
    template_name = 'gig/public/about.html'
    context_object_name = 'event'
    form_class = EventPurchaseTicketForm

    def get_context_data(self, **kwargs):
        context = super(EventDetailView, self).get_context_data(**kwargs)

    ...

        return context