function longPoll() {
        fetch('/plugins/md_presale/demons/deadline.php', {
            cache: 'no-cache',
            headers: {
                'Content-Type': 'application/json'
            },
            data: {
                userId: 115
            }
        }).then(function(response) {
            if(response.status === 200) {
                console.log(response);
                longPoll();
            }
        }).catch(function (err) {
            console.log(err);
        })
    }

    longPoll();