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var xhr = new XMLHttpRequest();
var requestUrl = "https://localhost:9092/api/v1/ticket/79343564-147f-4a2a-ac2a-182d7a55f802/ds/data";
xhr.open("GET", requestUrl);
xhr.responseType = "blob";
xhr.onload = function() {
    if (xhr.status == 200) {
        dsData = xhr.response;
        message = "Данные ЭЦПЭП успешно получены.";
    } else {
        var reader = new FileReader();
        reader.onload = function() {
            var response = reader.result;
            try {
                var jsonResponse = JSON.parse(xhr.responseText);
                message = jsonResponse.message;
            } catch (e) {
                message = (xhr.responseText == undefined) ? "Ошибка при получении данных ЭЦПЭП." : xhr.responseText;
            }
        }
        reader.readAsText(xhr.response);
    }
};
xhr.send();