to_message (OpenID::Server::ProtocolError)

    # File lib/openid/server.rb, line 1418
          def to_message
            namespace = @openid_message.get_openid_namespace()
            reply = Message.new(namespace)
            reply.set_arg(OPENID_NS, 'mode', 'error')
            reply.set_arg(OPENID_NS, 'error', self.to_s)

            if @contact
              reply.set_arg(OPENID_NS, 'contact', @contact.to_s)
            end

            if @reference
              reply.set_arg(OPENID_NS, 'reference', @reference.to_s)
            end

            return reply
          end