How to force routes to always use HTTPS or HTTP

Sometimes, you want to secure some routes and be sure that they are always accessed via the HTTPS protocol. The Routing component allows you to enforce the URI scheme via schemes:

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secure:
    path:     /secure
    defaults: { _controller: AcmeDemoBundle:Main:secure }
    schemes:  [https]

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<?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 http://symfony.com/schema/routing/routing-1.0.xsd">

    <route id="secure" path="/secure" schemes="https">
        <default key="_controller">AcmeDemoBundle:Main:secure</default>
    </route>
</routes>

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use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;

$collection = new RouteCollection();
$collection->add('secure', new Route('/secure', array(
    '_controller' => 'AcmeDemoBundle:Main:secure',
), array(), array(), '', array('https')));

return $collection;

The above configuration forces the secure route to always use HTTPS.

When generating the secure URL, and if the current scheme is HTTP, Symfony will automatically generate an absolute URL with HTTPS as the scheme:

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{# If the current scheme is HTTPS #}
{{ path('secure') }}
{# generates /secure #}

{# If the current scheme is HTTP #}
{{ path('secure') }}
{# generates https://example.com/secure #}

The requirement is also enforced for incoming requests. If you try to access the /secure path with HTTP, you will automatically be redirected to the same URL, but with the HTTPS scheme.

The above example uses https for the scheme, but you can also force a URL to always use http.