verify_return_to (OpenID::Consumer::IdResHandler)

    # File lib/openid/consumer/idres.rb, line 140
          def verify_return_to
            begin
              msg_return_to = URI.parse(URINorm::urinorm(fetch('return_to')))
            rescue URI::InvalidURIError
              raise ProtocolError, ("return_to is not a valid URI")
            end

            verify_return_to_args(msg_return_to)
            if !@current_url.nil?
              verify_return_to_base(msg_return_to)
            end
          end