# File lib/openid/server.rb, line 894 def encode_to_url return_to = @query['openid.return_to'] unless return_to raise ArgumentError, 'No return_to in query' end args = { 'openid.mode' => 'error', 'openid.error' => self.to_s } return OpenID::Util.append_args(return_to, args) end