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1 | # Troubleshooting |
2 | ||
3 | ## My custom service card doesn't work, nothing appears or offline status is displayed (pi-hole, sonarr, ping, ...) | |
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5 | You might by facing a [CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS) (Cross Origin Request Sharing) issue. | |
6 | It happens when the targeted service is hosted on a different domain or port. | |
7 | Web browsers will not allow to fetch information from a different site without explicit permissions (the targeted service | |
8 | must include a special `Access-Control-Allow-Origin: *` HTTP headers). | |
e4b07784 | 9 | If this happens your web console (`ctrl+shift+i` or `F12`) will be filled with this kind of errors: |
7129af3b BW |
10 | |
11 | ```text | |
12 | 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. | |
13 | ``` | |
14 | ||
15 | To resolve this, you can either: | |
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17 | * Host all your target service under the same domain & port. | |
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18 | * Modify the target server configuration so that the response of the server included following header- `Access-Control-Allow-Origin: *` (<https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests>). It might be an option in the targeted service, otherwise depending on how the service is hosted, the proxy or web server can seamlessly add it. |
19 | * Use a cors proxy server like [`cors-container`](https://github.com/imjacobclark/cors-container), [`cors-anywhere`](https://github.com/Rob--W/cors-anywhere) or many others. |