code: protected HttpAction forbidden(final C context, final List<Client> currentClients, final List<UserProfile> profiles,
                                     final String authorizers) {
          return ForbiddenAction.INSTANCE;
      }
docs: Return a forbidden error.
  
  @param context the web context
  @param currentClients the current clients
  @param profiles the current profiles
  @param authorizers the authorizers
  @return a forbidden error