laravel - 对/autodiscover/autodiscover.xml 的请求导致 TokenMismatchException

Question

我有一个 Laravel 应用程序，它获得了合理的流量。

为了更优雅地处理 TokenMismatchException 类型的异常(当 session 生命周期到期然后用户提交表单时往往会抛出该异常)，我更改了异常处理程序的 render() 方法，如下所示:

/**
 * Render an exception into an HTTP response.
 *
 * @param  \Illuminate\Http\Request  $request
 * @param  \Exception  $e
 * @return \Illuminate\Http\Response
 */
public function render($request, Exception $e)
{
    if ($e instanceof \Illuminate\Session\TokenMismatchException){

        return redirect($request->fullUrl())->with('error',"Sorry your session has expired please resubmit your request.");
    }

    return parent::render($request, $e);
}

这对于正常请求来说工作得很好，它不会抛出异常，而是设置 session 闪存消息并重定向回所请求的页面。但是，我注意到以下请求仍然引发许多此类异常:

/autodiscover/autodiscover.xml

我知道上述内容与 Exchange 有关，因此它可能不是恶意的。

我感到困惑的是 a) 为什么这个未路由的 url 会触发 Laravel 的 CSRF 保护以及 b) 为什么我更新的处理程序没有捕获异常？

我尝试为此网址添加路由，并手动抛出 404，但这没有帮助。

我可以做什么来防止抛出这些异常？

根据要求编辑堆栈跟踪:

2015-10-26 11:44:38] production.ERROR: exception 'Illuminate\Session\TokenMismatchException' in /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php:53
Stack trace:
#0 [internal function]: Illuminate\Foundation\Http\Middleware\VerifyCsrfToken->handle(Object(Illuminate\Http\Request), Object(Closure))
#1 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(124): call_user_func_array(Array, Array)
#2 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/View/Middleware/ShareErrorsFromSession.php(54): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#3 [internal function]: Illuminate\View\Middleware\ShareErrorsFromSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#4 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(124): call_user_func_array(Array, Array)
#5 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Session/Middleware/StartSession.php(62): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#6 [internal function]: Illuminate\Session\Middleware\StartSession->handle(Object(Illuminate\Http\Request), Object(Closure))
#7 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(124): call_user_func_array(Array, Array)
#8 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/AddQueuedCookiesToResponse.php(37): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#9 [internal function]: Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse->handle(Object(Illuminate\Http\Request), Object(Closure))
#10 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(124): call_user_func_array(Array, Array)
#11 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Cookie/Middleware/EncryptCookies.php(59): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#12 [internal function]: Illuminate\Cookie\Middleware\EncryptCookies->handle(Object(Illuminate\Http\Request), Object(Closure))
#13 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(124): call_user_func_array(Array, Array)
#14 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/CheckForMaintenanceMode.php(42): Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#15 [internal function]: Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode->handle(Object(Illuminate\Http\Request), Object(Closure))
#16 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(124): call_user_func_array(Array, Array)
#17 [internal function]: Illuminate\Pipeline\Pipeline->Illuminate\Pipeline\{closure}(Object(Illuminate\Http\Request))
#18 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php(103): call_user_func(Object(Closure), Object(Illuminate\Http\Request))
#19 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(122): Illuminate\Pipeline\Pipeline->then(Object(Closure))
#20 /var/www/vhosts/sitedomain.com/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(87): Illuminate\Foundation\Http\Kernel->sendRequestThroughRouter(Object(Illuminate\Http\Request))
#21 /var/www/vhosts/sitedomain.com/public_html/index.php(53): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request))
#22 {main}  

Answer 1

因此，解决方案相对简单。似乎 Laravel 的默认行为是处理所有 post(大概还有 put 和 delete...)请求，无论它们是否在路由中定义。

因此我们可以在VerifyCsrfToken中间件$ except数组中添加一个异常(exception):

protected $except = [
    'autodiscover/autodiscover.xml'
]

添加上述内容后，我的 TokenMismatchException 不再抛出。