To get error pages to work with a reverse proxies, you may need to tell the webserver to intercept the errors from the service.
In NGINX the way to do this is with proxy_intercept_errors on;
This can break some services (like plex), add proxy_intercept_errors off; to the location if that is the case.
NGINX Example for Proxies
Regular Proxy
Subdomain Proxy
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# This is using nginx's built-in variables, should be copy-paste for most setups.
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error_page 401 $scheme://$server_name/api/v2/organizr/error/$status?return=$request_uri; # We only want the Unauthorized code to redirect back to the loginpage
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error_page 400 402 403 404 405 408 500 502 503 504 $scheme://$server_name/api/v2/organizr/error/$status; # Responds with the errorpage for the errorcodes listed
Copied!
For Subdomain's, we replaced $server_name with the domain organizr is on.
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error_page 401 $scheme://organizr.app/api/v2/organizr/error/$status?return=$scheme://$host$request_uri; # We only want the Unauthorized code to redirect back to the loginpage
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error_page 400 402 403 404 405 408 500 502 503 504 $scheme://organizr.app/api/v2/organizr/error/$status; # Responds with the errorpage for the errorcodes listed
Copied!
Organizr Reverse Proxy
If you have Organizr Reversed Proxied, which we are sure you do. You need to add an additional block for the API so it doesn't overwrite the errors for it.
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location /api {
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include /config/nginx/proxy.conf; # Replace with any proxy config options
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proxy_pass http://organizr-ip:organizr-port;
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proxy_intercept_errors off; # This is the important part