wallabag lost port when redirecting requests from reverse proxy

[stjacob]

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;