ingress-nginx-helm/docs/user-guide/default-backend.md

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# Default backend
The default backend is a service which handles all URL paths and hosts the nginx controller doesn't understand
(i.e., all the requests that are not mapped with an Ingress).
Basically a default backend exposes two URLs:
- `/healthz` that returns 200
- `/` that returns 404
!!! example
The sub-directory [`/images/custom-error-pages`](https://github.com/kubernetes/ingress-nginx/tree/master/images/custom-error-pages)
provides an additional service for the purpose of customizing the error pages served via the default backend.