首先ajax跨域请求携带cookies
一、需要设置前端withCredentials: true
$.ajax({type:'post',url: 'xxxxxxx',dataType: 'json',xhrFields: {withCredentials: true //解决跨服务传递时不传递cookie的问题，允许携带证书},crossDomain: true, //允许跨域success: function (data) {console.info(data)if (data.status == 200){alert(data.data)$("#shopping-num").html = data.data}}})
二、需要设置服务器或者访问的文件Access-Control-Allow-Credentials true
还需要设置Access-Control-Allow-Origin 的域名（重点）
如果是 Access-Control-Allow-Origin * 也会发生CORS错误
比如
php
<?phpheader('Access-Control-Allow-Origin:');header('Access-Control-Allow-Credentials:true');header('Access-Control-Allow-Methods:POST');var_dump($_POST);var_dump($_GET);var_dump(file_get_contents("php://input"));var_dump($_COOKIE);
java
//解决ajax携带cookie的跨域问题，使用@CrossOrigin注解冲突public class CorsFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {HttpServletResponse response = (HttpServletResponse) res;HttpServletRequest reqs = (HttpServletRequest) req;// response.setHeader("Access-Control-Allow-Origin",reqs.getHeader("Origin"));//注意重点:下面的第二个参数不可以写*通配，需要明确写出请求方的IP地址及端口response.setHeader("Access-Control-Allow-Origin","http://localhost:8081");response.setHeader("Access-Control-Allow-Credentials", "true");response.setHeader("Access-Control-Allow-Methods", "POST, GET, PATCH, DELETE, PUT");response.setHeader("Access-Control-Max-Age", "3600");response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");chain.doFilter(req, res);}@Overridepublic void destroy() {}}
或者在服务器的config设置
apache
Header set Access-Control-Allow-Credentials true
ps：遇到的问题
当使用ajax 访问 localhost 时候不会携带cookies
比如
解决方案
一、使用服务器的代理功能
server {listen 80;server_name www.test-;location / {root E:\fontweb;index index.html index.htm;}error_page 500 502 503 504 /50x.html;location = /50x.html {root html;}location /api/ {proxy_pass http://localhost:9090/;}}
二、也可以把 localhost 更换127.0.0.1
localhost
127.0.0.1
猜想当在同一域名下，有两个服务器，localhost找不到是哪个服务器
比如 在同一台机器上有nginx（80端口），apache（8080端口）
当访问 localhost 时候找不到是 nginx 还是 apache
