var adapter = {
    server_url: "",
    responseJson: {},
    onset: function() {},
    onget: function() {},
    setter: function () {
        xhr = new XMLHttpRequest();
        xhr.open('GET', this.server_url + '/set/' + encodeURIComponent(JSON.stringify(this.onset())));
        xhr.onload = function () {
            console.log(xhr.responseText);
        };
        xhr.send();
    },
    getter: function () {
        var self = this;
        var xhr = new XMLHttpRequest();
        xhr.open('GET', this.server_url + '/get');
        xhr.onload = function () {
            try {
                var response = JSON.parse(this.responseText);
                self.responseJson = response;
                self.onget();
            } catch (err) {
                console.warn("json could not be parsed:", err, this.responseText);
            }
        };
        xhr.send();
    },
};