Update Nginx configuration to replace $http_host with $host$is_request_port$request_port for better compatibility

Signed-off-by: GitHub <noreply@github.com>

root/defaults/nginx/authelia-server.conf.sample

@@ -1,4 +1,4 @@
-## Version 2025/03/25 - Changelog: https://github.com/linuxserver/docker-swag/commits/master/root/defaults/nginx/authelia-server.conf.sample
+## Version 2026/10/20 - Changelog: https://github.com/linuxserver/docker-swag/commits/master/root/defaults/nginx/authelia-server.conf.sample
 # Make sure that your authelia container is in the same user defined bridge network and is named authelia
 # Rename /config/nginx/proxy-confs/authelia.subdomain.conf.sample to /config/nginx/proxy-confs/authelia.subdomain.conf
 
@@ -28,7 +28,7 @@ location @authelia_proxy_signin {
     add_header Set-Cookie $set_cookie;
 
     ## Set the $target_url variable based on the original request
-    set_escape_uri $target_url $scheme://$http_host$request_uri;
+    set_escape_uri $target_url $scheme://$host$is_request_port$request_port$request_uri;
 
     ## Translate the Location response header from the auth subrequest into a variable
     auth_request_set $signin_url $upstream_http_location;