CSP settings do not work

[AdiWehrli]

Hello together,

I use AKHQ von @tchiotludo which is based on micronaut's version 3.6.3. As documented I added the following configuration in application.yml file:

micronaut:
  application:
    name: akhq
  security:
  .
  .
  .
  views:
    enabled: true
    csp:
      enabled: true
      policyDirectives: "default-src 'none'; frame-src 'self'; script-src 'nonce-{#nonceValue}' 'self'; connect-src 'self'; img-src 'self' data:; style-src 'nonce-{#nonceValue}' 'self'; frame-ancestors 'self'; form-action 'self'; font-src 'self'; manifest-src 'self'; worker-src blob:; upgrade-insecure-requests"
      generateNonce: true

After restart with this configuration there is no sign of any CSP response header (in browser's dev tools).

What am I doing wrong?

Thanks very much in advance.

Kind regards,
Adi