处理前后端跨域

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server {
    listen       80;
    server_name  www.example.com;
    root         /usr/share/nginx/html;
    
    location / {
    
        proxy_pass http://localhost:8188/;
        # 设置是否允许 cookie 传输
        add_header Access-Control-Allow-Credentials true;
        # 允许请求地址跨域 * 做为通配符
        add_header Access-Control-Allow-Origin * always;
        # 允许跨域的请求方法
        add_header Access-Control-Allow-Methods 'GET, POST, PUT, DELETE, OPTIONS';
        add_header Access-Control-Allow-Headers 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';

        if ($request_method = 'OPTIONS') {
            return 204;
        }
    }
}