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Custom Headers

This example demonstrates configuration of the nginx ingress controller via a ConfigMap to pass a custom list of headers to the upstream server.

custom-headers.yaml defines a ConfigMap in the ingress-nginx namespace named custom-headers, holding several custom X-prefixed HTTP headers.

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/docs/examples/customization/custom-headers/custom-headers.yaml

configmap.yaml defines a ConfigMap in the ingress-nginx namespace named ingress-nginx-controller. This controls the global configuration of the ingress controller, and already exists in a standard installation. The key proxy-set-headers is set to cite the previously-created ingress-nginx/custom-headers ConfigMap.

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/docs/examples/customization/custom-headers/configmap.yaml

The nginx ingress controller will read the ingress-nginx/ingress-nginx-controller ConfigMap, find the proxy-set-headers key, read HTTP headers from the ingress-nginx/custom-headers ConfigMap, and include those HTTP headers in all requests flowing from nginx to the backends.

The above example was for passing a custom list of headers to the upstream server. To pass the custom headers before sending response traffic to the client, use the add-headers key:

kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/main/docs/examples/customization/custom-headers/configmap-client-response.yaml

Test

Check the contents of the ConfigMaps are present in the nginx.conf file using: kubectl exec ingress-nginx-controller-873061567-4n3k2 -n ingress-nginx -- cat /etc/nginx/nginx.conf