spring boot ajax request with csrf

spring_boot_csrf.js

// <meta name="_csrf" th:content="${_csrf.token}"/>
// <meta name="_csrf_header" th:content="${_csrf.headerName}"/>
    
$(function () {
    var token = $("meta[name='_csrf']").attr("content");
    var header = $("meta[name='_csrf_header']").attr("content");
    $(document).ajaxSend(function(e, xhr, options) {
        xhr.setRequestHeader(header, token);
    });
});

//<input type="hidden" th:name="${_csrf.parameterName}" th:value="${_csrf.token}"/>