nginx配置了跨域无效解决办法

  location / {
            add_header Access-Control-Allow-Credentials false;
            add_header Access-Control-Allow-Origin *; 
            add_header Access-Control-Allow-Methods 'GET, POST, 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; }

            proxy_pass http://127.0.0.1:3000;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "Upgrade";
            proxy_set_header X-Real-IP $remote_addr;
        }