nginx 配置，需要 https ，仅供参考：
server {
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name nas.example.com;
ssl_certificate /***.cer;
ssl_certificate_key /***.key;
location / {
proxy_pass http://frps:***;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Port $server_port;
proxy_set_header X-Nginx-Proxy true;
}
}