你的代码出错了:
致命错误:Uncaught InvalidArgumentException: Cannot redirect to an empty URL. in /usr/www/oldphpserver/releasev2.0/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/RedirectResponse.php:76 Stack trace: #0 /usr/www/oldphpserver/releasev2.0/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/RedirectResponse.php(39): Symfony\Component\HttpFoundation\RedirectResponse->setTargetUrl(NULL) #1 /usr/www/oldphpserver/releasev2.0/src/AppBundle/Listener/ExceptionListener.php(44): Symfony\Component\HttpFoundation\RedirectResponse->__construct(NULL) #2 [internal function]: AppBundle\Listener\ExceptionListener->onKernelException(Object(Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent), 'kernel.exceptio...', Object(Symfony\Component\HttpKernel\Debug\TraceableEventDispatcher)) #3 /usr/www/oldphpserver/releasev2.0/vendor/symfony/symfony/src/Symfony/Component/EventDispatcher/Debug/WrappedListener.php(61): call_user_func(Array, Object(Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent), 'kern
文件:/usr/www/oldphpserver/releasev2.0/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/RedirectResponse.php
在第76行