nginx设置允许跨域

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server {         listen       8088;         server_name  localhost;           #charset koi8-r;           #access_log  logs/host.access.log  main;         add_header 'Access-Control-Allow-Methods' 'POST, GET, OPTIONS';         add_header 'Access-Control-Allow-Headers' '*';         add_header 'Access-Control-Allow-Origin' '*' always;         add_header 'Access-Control-Allow-Credentials' 'true' ; #是否允许浏览器后续请求携带认证信息（cookies）,该值只能是true,如果服务器不要浏览器发送Cookie，删除该字段即可。                   #后端代理         location /api/ {             if ($request_method = 'OPTIONS') {                 return 204;             }             proxy_pass http://101.32.253.94:8080;                       }                   #前端代理         location  / {             # OPTIONS 直接返回204             if ($request_method = 'OPTIONS') {                 return 204;             }             proxy_pass  http://localhost:3440;         }                         }