# File lib/openid/consumer.rb, line 452
    def ca_path=(ca_path)
      ca_path = ca_path.to_s
      if File.exists?(ca_path)
        @ca_path = ca_path
        @fetcher.ca_path = ca_path
      else
        raise ArgumentError, "#{ca_path} is not a valid file path"
      end
    end