Symfony 2:检查主机名称并重定向

# app/config/routing.yml
check_host:
    path: /
    defaults:
        _controller: AppBundle:Default:checkHost

// src/AppBundle/Controller/DefaultController.php
namespace AppBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RedirectResponse;

class DefaultController extends Controller
{
    public function checkHost(Request $request)
    {
        $allowedHost = 'example.com'; // 允许的主机名称

        if ($request->getHost() !== $allowedHost) {
            $redirectUrl = $request->getSchemeAndHttpHost() . $request->getRequestUri();
            $redirectUrl = str_replace($request->getHost(), $allowedHost, $redirectUrl);

            return new RedirectResponse($redirectUrl);
        }

        // 继续处理其他请求
    }
}