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Add override for proxy_intercept_errors when using Custom HTTP Errors (#9497)

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* added proxy-intercept-errors config option

* fixed error when comparing locations

* fixed missing location config from annotation
added e2e test

* reversed logic for proxy-intercept-errors to disable-proxy-intercept-errors

* reversed logic to disable-proxy-intercept-errors

* reversed logic

* default has to be false

* put comment in same line as return

* run gofmt

* fixing wrong Boilerplate header

* updated code to new IngressAnnotation interface

* fixes to satisfy PR comments

* synced with upstream; fixed typo

* gofumpt disableproxyintercepterrors.go

* gofumpt
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chriss-de 2023-11-17 05:43:54 +01:00 • committed by GitHub
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docs/user-guide/nginx-configuration/annotations.md
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@ -50,6 +50,7 @@ You can add these Kubernetes annotations to specific Ingress objects to customiz
|[nginx.ingress.kubernetes.io/client-body-buffer-size](#client-body-buffer-size)|string|
|[nginx.ingress.kubernetes.io/configuration-snippet](#configuration-snippet)|string|
|[nginx.ingress.kubernetes.io/custom-http-errors](#custom-http-errors)|[]int|
|[nginx.ingress.kubernetes.io/disable-proxy-intercept-errors](#disable-proxy-intercept-errors)|"true" or "false"|
|[nginx.ingress.kubernetes.io/default-backend](#default-backend)|string|
|[nginx.ingress.kubernetes.io/enable-cors](#enable-cors)|"true" or "false"|
|[nginx.ingress.kubernetes.io/cors-allow-origin](#enable-cors)|string|
@ -330,6 +331,17 @@ Example usage:
nginx.ingress.kubernetes.io/custom-http-errors: "404,415"
```
## Disable Proxy intercept Errors
Like the [`disable-proxy-intercept-errors`](./configmap.md#disable-proxy-intercept-errors) value in the ConfigMap, this annotation allows to disable NGINX `proxy-intercept-errors` when `custom-http-errors` are set, but only for the NGINX location associated with this ingress. If a [default backend annotation](#default-backend) is specified on the ingress, the errors will be routed to that annotation's default backend service (instead of the global default backend).
Different ingresses can specify different sets of errors codes and there are UseCases where NGINX shall not intercept all errors returned from upstream.
If `disable-proxy-intercept-errors` is also specified globally, the annotation will override the global value for the given ingress' hostname and path.
Example usage:
```
nginx.ingress.kubernetes.io/disable-proxy-intercept-errors: "false"
```
### Default Backend
This annotation is of the form `nginx.ingress.kubernetes.io/default-backend: <svc name>` to specify a custom default backend. This `<svc name>` is a reference to a service inside of the same namespace in which you are applying this annotation. This annotation overrides the global default backend. In case the service has [multiple ports](https://kubernetes.io/docs/concepts/services-networking/service/#multi-port-services), the first one is the one which will receive the backend traffic.