Document https://github.com/go-gitea/gitea/pull/39190, which reads the RFC 7239 `Forwarded` header when `X-Forwarded-For` is absent and keeps the forwarded client port.
- `REVERSE_PROXY_LIMIT`: list `X-Real-IP`, `X-Forwarded-For` and `Forwarded` in the order they are read, and where the client port comes from, also in zh-cn and zh-tw
- Reverse proxies: require the proxy to set `X-Real-IP`, since Caddy, Apache and HAProxy pass a client-sent one through by default, and mention `X-Real-Port` for logging the client port
Co-authored-by: Lunny Xiao <[email protected]>
Reviewed-on: https://gitea.com/gitea/docs/pulls/560
Reviewed-by: Lunny Xiao <[email protected]>