anchor.diff:  is configured to trust the `X-Remote-User` header.
   
   ----
  +LoadModule auth_form_module modules/mod_auth_form.so
  +LoadModule session_module modules/mod_session.so
  +LoadModule request_module modules/mod_request.so
  +
   # Nothing needs to be served over HTTP.  This virtual host simply redirects to
   # HTTPS.
   <VirtualHost *:80>
  
positive.code:       - X-Remote-User
  ----
  
  Now restart everything:
  
  ----
  # systemctl restart httpd
  
negative.code: ----
    identityProviders:
    - name: requestheader
      challenge: true
      challengeURL: "https://[MASTER]/challenging-proxy/oauth/authorize?${query}"
      login: true
      loginURL: "https://[MASTER]/login-proxy/oauth/authorize?${query}"
      provider:
        apiVersion: v1
        kind: RequestHeaderIdentityProvider
  