I want to make files downloadble on click, but it does not work. Here comes my code:

files.html.twig

{% set filepath = asset('bundles/example/files/filename.pdf') %}
<a href="{{ url('_bundle_route_to_download', { 'filepath': filepath }) }}">
<button class="button button-icon button-download">Download</button></a>

controller.php

 /**
    * @Route("/example/download/{filepath}", name="_bundle_route_to_download")
    */
    public function downloadFile($filepath)
    {
      //...
    }

This is the error I get:

No route found for "GET    /example/download//bundles/example/files/filename.pdf%3F1418390151

What is wrong about my syntax?

如何获取地址栏参数.

weixin_46668074

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