你是不是开启了 `proxy_pass Host $http_host;`类似于这样的反向代理参数? 这个参数的确在http3带不过来,只能改为 `proxy_pass Host $host;`,这个问题在nginx的issue有记录,参见: [https://trac.nginx.org/nginx/ticket/2551](https://link.segmentfault.com/?enc=6zex0iFUUhhMjulUTzFBxQ%3D%3D.JAugd%2BIDJDAvUWyGIcUGjc5RbMdjSwlbJHmw2mdNN1XKFiaoW2VnhcSO%2F4d1uuo%2F)