Debug Toolbar.

def view(self, request):
        """ Debug Toolbar. """
        auth = yield from self.authorize(request)
        if not auth:
            raise HTTPForbidden()

        request_id = request.match_info.get('request_id')
        state = self.history.get(request_id, None)

        response = yield from self.app.ps.jinja2.render(
            'debugtoolbar/toolbar.html',
            debugtoolbar=self,
            state=state,
            static_path=self.cfg.prefix + 'static',
            panels=state and state.panels or [],
            global_panels=self.global_panels,
            request=state and state.request or None,
        )
        return Response(text=response, content_type='text/html')