Caddy 反代求助

求助坛里的大神，我的docker container映射了127.0.0.1:6800，想要caddy反代https,    配置如下
  :6500 {
          encode gzip
          tls ./ssl/ssl.crt  ./ssl/ssl.key
          reverse_proxy  127.0.0.1:6800
          }
systemctl 无法启动caddy. 有老哥知道怎么处理吗。贴上日志
2021/01/13 12:09:17.745 INFO    using adjacent Caddyfile
2021/01/13 12:09:17.748 INFO    http    enabling automatic HTTP->HTTPS redirects       {"server_name": "srv0"}
2021/01/13 12:09:17.750 INFO    tls.cache.maintenance   started background certificate maintenance     {"cache": "0xc000214f50"}
2021/01/13 12:09:17.751 INFO    tls.cache.maintenance   stopped background certificate maintenance     {"cache": "0xc000214f50"}
Valid configuration