problem with encoded url by a bookmarklet and routes in silex

index.php

<?php
require_once __DIR__.'/../vendor/autoload.php';

$app = new Silex\Application();

$app->register(new Silex\Provider\TwigServiceProvider(), array(
    'twig.path' => __DIR__.'/../views',
));

$app->register(new Silex\Provider\DoctrineServiceProvider(), array(
    'db.options' => array(
        'driver'   => 'pdo_sqlite',
        'path'     => __DIR__.'/../storage/poche.sqlite',
    ),
));

/**
 * example of generated url : http://silex.localhost/add/http%3A%2F%2Fsymfony.com%2F for http://symfony.com/
 */ 

$app->get('add/{url}', function($url) use ($app, $functions) {
    // ...
    // some stuff
    // ...
    return $app->redirect('/');
})->assert('url', '.+');

$app['debug'] = true;
$app->run();

The bookmarklet :

javascript:void((function(){var%20url%20=%20location.href%20||%20url;window.open('http://silex.localhost/add/'+encodeURIComponent(url),'_self');})())

ça marche pour http://symfony.com sans encoder le lien

<?php
require_once __DIR__.'/../vendor/autoload.php'; 

use Symfony\Component\HttpFoundation\Request;
use Silex\Route;
use Silex\Controller;
$app = new Silex\Application(); 

$app['debug'] = true;

$route =  new Route('/add/{url}',array(),array('url'=>'.+'));
$route->setDefault('_controller', function($url) use ($app) {
    return $url;
});

$app['routes']->add('GET_add_url',$route);

$app->run(); 

merci, je regarde