silverstripe-framework/_config/requestprocessors.yml

---
Name: requestprocessors
---
SilverStripe\Core\Injector\Injector:
  SilverStripe\Control\Director:
    # Note: Don't add 'class' config here, as it will affect ErrorDirector as well
    properties:
      Middlewares:
        TrustedProxyMiddleware: '%$SilverStripe\Control\Middleware\TrustedProxyMiddleware'
        AllowedHostsMiddleware: '%$SilverStripe\Control\Middleware\AllowedHostsMiddleware'
        SessionMiddleware: '%$SilverStripe\Control\Middleware\SessionMiddleware'
        RequestProcessorMiddleware: '%$SilverStripe\Control\RequestProcessor'
        FlushMiddleware: '%$SilverStripe\Control\Middleware\FlushMiddleware'
  SilverStripe\Control\Middleware\AllowedHostsMiddleware:
    properties:
      AllowedHosts: '`SS_ALLOWED_HOSTS`'
  SilverStripe\Control\Middleware\TrustedProxyMiddleware:
    properties:
      TrustedProxyIPs: '`SS_TRUSTED_PROXY_IPS`'
  RateLimitedSecurityController:
    class: SilverStripe\Control\Middleware\RequestHandlerMiddlewareAdapter
    properties:
      RequestHandler: '%$SilverStripe\Security\Security'
      Middlewares:
        - '%$SilverStripe\Control\Middleware\RateLimitMiddleware'
---
Name: errorrequestprocessors
After:
  - requestprocessors
---
SilverStripe\Core\Injector\Injector:
  # Note: If Director config changes, take note it will affect this config too
  SilverStripe\Core\Startup\ErrorDirector: '%$SilverStripe\Control\Director'