问当缓存为false时，$http.get()不会触发新的网络请求

EN

    var checkSystemStatus = function () {
        var timeout = 4,
            timerMessages = {};
            timerMessages[0] = "Check system...";
            timerMessages[timeout-1] = "Checking system in [[seconds]]...";
            timerMessages[timeout] = "System is offline";

        console.log('checking system status');
        $http.get(apiUrl+'/system/isOnline', {cache: false}).
            success(function(r) {
                console.log('success');
                if (r == 'true' && NotificationService.isBlockingDialogVisible()) {
                    document.location.reload(true);
                } else if (r != 'true') {
                    NotificationService.showBlockingTimer(timerMessages, timeout);
                }
            }).
            error(function (r) {
                console.log('error');
                NotificationService.showBlockingTimer(timerMessages, timeout);
            });

        setTimeout(function () {
            checkSystemStatus();
        }, (timeout+1) * 1000);
    }
    checkSystemStatus();