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readme: add FAQ

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Anthony Donlon
2025-12-10 10:27:50 +08:00
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@@ -142,6 +142,16 @@ params = {
[Demo](https://virt.moe/cloudflare-error-page/examples/working) [Demo](https://virt.moe/cloudflare-error-page/examples/working)
## FAQ
### How to show real user IP / Cloudflare Ray ID / data center location in the error page so that it looks more realistic?
Ray ID and user IP field in the error page can be set by `ray_id` and `client_ip` properties in the `params` argument passed to the render function. The real Cloudflare Ray ID and the data center location of current request can be extracted from the `Cf-Ray` request header (e.g. `Cf-Ray: 230b030023ae2822-SJC`). Detailed description of this header can be found in [Cloudflare documentation](https://developers.cloudflare.com/fundamentals/reference/http-headers/#cf-ray (https://developers.cloudflare.com/fundamentals/reference/http-headers/#cf-ray)).
To lookup the city name of the data center corresponding to the three letter code in the header, you can use a location list from [here](https://github.com/Netrvin/cloudflare-colo-list/blob/main/DC-Colos.json)
The demo server runs in our website did handle these. Take a look at [this file](https://github.com/donlon/cloudflare-error-page/blob/94c3c4ddbe521dee0c9a880ef33fa7a9f0720cbe/editor/server/utils.py#L34) for reference.
## See also ## See also
- [cloudflare-error-page-3th.pages.dev](https://cloudflare-error-page-3th.pages.dev/): - [cloudflare-error-page-3th.pages.dev](https://cloudflare-error-page-3th.pages.dev/):