context.js

    static setAdminOption(option, value, handleSuccess, handleError) {
        const formData = `option=${option}&value=${value}`;
        // create an AJAX request
        const xhr = new XMLHttpRequest();
        xhr.open('post', __ROOT_PATH__ + 'api/adminS');
        xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
        xhr.responseType = 'json';
        xhr.addEventListener('save', () => {
            if (xhr.status === 200) {
                handleSuccess(xhr.response.token);
            } else {
                // failure

                // change the component state
                const errors = xhr.response.errors ? xhr.response.errors : {};
                errors.summary = xhr.response.message;

                handleError(errors);
            }
        });
        xhr.send(formData);
    }