问如何在Laravel 4中禁用某些url的csrf标记

EN

<?php namespace App\Http\Middleware;

use Closure;
use Illuminate\Session\TokenMismatchException;

class VerifyCsrfToken extends \Illuminate\Foundation\Http\Middleware\VerifyCsrfToken {

    protected $except_urls = [
        'contact/create',
        'contact/update',
        ...
    ];

    public function handle($request, Closure $next)
    {
        $regex = '#' . implode('|', $this->except_urls) . '#';

        if ($this->isReading($request) || $this->tokensMatch($request) || preg_match($regex, $request->path()))
        {
            return $this->addCookieToResponse($request, $next($request));
        }

        throw new TokenMismatchException;
    }

}

protected $middleware = [

    ...

    'App\Http\Middleware\VerifyCsrfToken',
];

//app/Http/Middleware/VerifyCsrfToken.php

//add an array of Routes to skip CSRF check
private $openRoutes = ['free/route', 'free/too'];

//modify this function
public function handle($request, Closure $next)
    {
        //add this condition 
    foreach($this->openRoutes as $route) {

      if ($request->is($route)) {
        return $next($request);
      }
    }

    return parent::handle($request, $next);
  }