Fix proxied live updates

README.md

@@ -200,6 +200,55 @@ bash ./scripts/deploy.sh
 
 The script publishes the app locally, uploads a release to `/root/docker/rpgroller/releases/<UTC timestamp>`, updates `/root/docker/rpgroller/current`, rebuilds the `rpgroller` image, and recreates the `rpgroller` container. The SQLite database is preserved because the container keeps using the existing bind mount at `/root/docker/rpgroller/data`.
 
+Reverse proxy requirements for production:
+
+- Use `rpgroller.franktovar.de` as the only canonical host.
+- Forward `X-Forwarded-For` and `X-Forwarded-Proto` so ASP.NET Core can mark the session cookie as secure behind TLS termination.
+- Proxy `/_blazor` with WebSocket upgrade headers.
+- Proxy `/api/events/state` as Server-Sent Events with buffering disabled, for example:
+
+```nginx
+server {
+    server_name rpgroller.franktovar.de;
+
+    location /_blazor {
+        proxy_pass http://127.0.0.1:8082;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+        proxy_read_timeout 300;
+    }
+
+    location /api/events/state {
+        proxy_pass http://127.0.0.1:8082;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_buffering off;
+        proxy_cache off;
+        gzip off;
+        proxy_read_timeout 3600;
+        add_header X-Accel-Buffering no;
+    }
+
+    location / {
+        proxy_pass http://127.0.0.1:8082;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_read_timeout 300;
+    }
+}
+```
+
 Environment overrides:
 
 - Set `ConnectionStrings__RpgRoller` to point at a custom SQLite database.