Rails.application.config.content_security_policy do |p|
  p.base_uri        :none
  p.default_src     :none
  p.frame_ancestors :none
  p.font_src        :self, assets_host
  p.img_src         :self, :data, :blob, *media_hosts
  p.media_src       :self, :data, *media_hosts
  p.manifest_src    :self, assets_host

  if policy.sso_host.present?
    p.form_action :self, policy.sso_host
  else
    p.form_action :self
  end

  p.child_src  :self, :blob, assets_host
  p.worker_src :self, :blob, assets_host

  p.connect_src :self, :data, :blob, *media_hosts, Rails.configuration.x.streaming_api_base_url
  p.script_src  :self, assets_host, "'wasm-unsafe-eval'"
  p.frame_src   :self, :https
  p.style_src   :self, assets_host
…
# Report CSP violations to a specified URI
# For further information see the following documentation:
# https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
# Rails.application.config.content_security_policy_report_only = true

Rails.application.config.content_security_policy_nonce_generator = ->(_request) { SecureRandom.base64(16) }

Rails.application.config.content_security_policy_nonce_directives = %w(style-src)

Warm-up