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Troubleshooting

My custom service card doesn't work, nothing appears or offline status is displayed (pi-hole, sonarr, ping, ...)

You might by facing a CORS (Cross Origin Request Sharing) issue. It happens when the targeted service is hosted on a different domain or port. Web browsers will not allow to fetch information from a different site without explicit permissions (the targeted service must include a special Access-Control-Allow-Origin: * HTTP headers). If this happens your web console (ctrl+shit+i or F12) will be filled with this kind of errors:

Access to fetch at 'https://<target-service>' from origin 'https://<homer>' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.

To resolve this, you can either: