<?xml version="1.0" encoding="UTF-8" ?> <routes xmlns="http://symfony.com/schema/routing" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://symfony.com/schema/routing https://symfony.com/schema/routing/routing-1.0.xsd"> <route id="_preview_error" path="/{code}.{_format}"> <default key="_controller">error_controller::preview</default> <default key="_format">html</default> <requirement key="code">\d+</requirement> </route> </routes>