wallabag lost port when redirecting requests from reverse proxy

I am working on deploying a wallabag behind reverse proxy.

wallabag container adderss: `http://127.0.0.1:5555`，

reverse proxy domain: `https://wallabag.a.com:6666`，

Wallabag configure：
`- SYMFONY__ENV__DOMAIN_NAME=https://wallabag.a.com:6666`

When visiting “https://wallabag.a.com:6666”，the server redirected to "https://wallabag.a.com/login“，miss the port.

wallabag log：
`::ffff:10.0.3.9 - - [03/Jul/2025:10:53:02 +0800] "GET / HTTP/1.1" 302 215 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0"`

reverse proxy config：
` proxy_set_header Host '$host';
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-Forwarded-Host $host:$server_port;`