# File lib/httpclient/ssl_config.rb, line 170
    def add_crl(crl)
      unless crl.is_a?(X509::CRL)
        crl = X509::CRL.new(File.open(crl) { |f| f.read })
      end
      @cert_store.add_crl(crl)
      @cert_store.flags = X509::V_FLAG_CRL_CHECK | X509::V_FLAG_CRL_CHECK_ALL
      change_notify
    end