Nginx常见问题解决

1、nginx 或者tomcat 下 X-Content-Type-Options、X-XSS-Protection、Content-Security-Pol安全配置

add_header X-Frame-Options "SAMEORIGIN";
add_header X-XSS-Protection "1; mode=block";
add_header X-Content-Type-Options "nosniff";

参考：https://blog.csdn.net/weixin_41986096/article/details/108319848

2、nginx: [emerg] unknown "connection_upgrade" variable解决与思考

   http {
    map $http_upgrade $connection_upgrade {
    default upgrade;
    ''      close;
   }

    server {
        location / {
                    #…
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection $connection_upgrade;
            }
        }
}

参考：https://segmentfault.com/a/1190000018712908

3、Nginx: Connection reset by peer 错误定位

https://blog.csdn.net/zzhongcy/article/details/89090193