[Proposal]: Add large_client_header_buffers,client_header_buffer_size as configmap keys

[niruse]

I’ve opened a second issue case here as well:
nginxinc/nginx-ingress-helm-operator#426

Version

3.6.1

What Kubernetes platforms are you running on?

Openshift

Steps to reproduce

Bug Report: 400 Error When Request URL/Header Is Too Long

Describe the Bug

We couldn't find the proper setting to add to my configmap for updating large_client_header_buffers and client_header_buffer_size.
We could publish different configurations based on the article, but those two are not working.

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To Reproduce

Steps to reproduce the behavior:

1. Deploy the NGINX operator.
2. Deploy the ConfigMap (CM) with the following configuration:

   apiVersion: v1
   data:
     client-header-buffer-size: 512k
     client-max-body-size: 100m
     keep-alive-requests: "10000"
     large-client-header-buffers: 4 64k

3. Run the following command on one of the nodes:

   oc exec -it ngx1-nginx-ingress-controller-77dd6577b8-wfx89 -n nginx-ingress -- grep -r "client_header_buffer_size" /etc/nginx/

   • The configuration contains client_header_buffer_size changed to the new size.
4. Run the same command with large_client_header_buffers:

   oc exec -it ngx1-nginx-ingress-controller-77dd6577b8-wfx89 -n nginx-ingress -- grep -r "large_client_header_buffers" /etc/nginx/

   • Issue: The configuration does not reflect the changes for large_client_header_buffers.

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Expected Behavior

You should see the updated configuration in the NGINX configuration.

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Manual Solution

When I updated the large_client_header_buffers and client_header_buffer_size manually in the nginx.conf file, the error 400 was resolved, and I gained access to the web application.

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Environment

• Version of the NGINX Ingress Operator: 2.3.1
• Version of the Ingress Controller: 3.6.1
• Version of Kubernetes: v1.27.16+e826056
• Kubernetes Platform: OpenShift
• Using NGINX or NGINX Plug: Using NGINX
• Client Version: 4.14.18
• Kustomize Version: v5.0.1
• Server Version: 4.14.35

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[github-actions]

Hi @niruse thanks for reporting!

Be sure to check out the docs and the Contributing Guidelines while you wait for a human to take a look at this 🙂

Cheers!

[j1m-ryan]

Hi @niruse,
large-client-header-buffers and client-header-buffer-size are not supported config map keys. You can see a list of supported keys here.

The way to do this at the moment is to use a http or server snippet in the configmap.

I will change this issue from a bug to a proposal to add these keys as first class config map keys.

[niruse]

Hi Ryan,
Thank you for your response.
Could you provide an example of how to add it as snippets or HTTP in configmap?
We’ve tried different methods without success.