function send_to_redis(sid, data) {
    var host = "http://localhost:8081/";
    var params_str = $.param(data);
    $.ajax({
        type: "GET",
        url: host + "?" + params_str,
        crossDomain: true,
        xhrFields: {
                withCredentials: true
        },
        success: function(data) {
            console.log(data);
        }
    });
}

var sid = $.cookie("sid");
console.log($.cookie("sid"));
if (!sid) {
    sid = "undefined";
}

var data = {
    url: document.URL,
    referer: document.referer,
    sid: sid
};



send_to_redis(sid, data);