[Bug]: client-max-body-size is ignored when using a route with splits on a VirtualServer

[YoavSitbon]

Version

3.7.1

What Kubernetes platforms are you running on?

Openshift

Steps to reproduce

1. create a virtualserver with a route with splits and upstreams with client-max-body-size. example:

apiVersion: k8s.nginx.org/v1
kind: VirtualServer
metadata:
  name: splits-vs
  namespace: vs-namspace
spec:
  host: splits.com
  upstreams:
  - name: upstream1
    service: svc1
    port: 80
    client-max-body-size: 15M
  - name: upstream2
    service: svc2
    port: 80
    client-max-body-size: 15M
  routes:
  - path: /
    splits:
      - weight: 50
        action:
          pass: upstream1
      - weight: 50
        action:
          pass: upstream2

2. make a request to the host with a body size that should be allowed by the configuration. for example try a post request with a 10MB file in the body.
3. should get a "413 Request Entity Too Large response" that indicates the client-max-body-size option was ignored.

Temporary Solution
I was able to overcome this issue by adding:

  server-snippets: |
    client_max_body_size 15M;

however we try to avoid using snippets as much as possible and there is no apparent reason on why it's not working without the snippet.

[github-actions]

Hi @YoavSitbon 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!