How to add a _url default to routes, so a external url can be generated by name.

config.yml

parameters:
    router.options.generator_class: "Acme\\DemoBundle\\Routing\\Generator\\UrlGenerator"
    router.options.generator_base_class: "Acme\\DemoBundle\\Routing\\Generator\\UrlGenerator"

routing.yml

# This will generate a url to google.
to_google:
    path:     /to-google
    defaults:
        _url: "http://www.google.com/"

UrlGenerator.php

<?php

namespace Acme\DemoBundle\Routing\Generator;

use Symfony\Component\Routing\Generator\UrlGenerator as BaseUrlGenerator;

class UrlGenerator extends BaseUrlGenerator
{
    protected function doGenerate($variables, $defaults, $requirements, $tokens, $parameters, $name, $referenceType, $hostTokens)
    {
        if(isset($defaults['_url'])) {
            return $defaults['_url'];
        }

        return parent::doGenerate($variables, $defaults, $requirements, $tokens, $parameters, $name, $referenceType, $hostTokens);
    }
}

@yceruto LOL, this was 5 (!) years ago :) that did not work back than.

hi，Is this problem solved?