Symfony Cache Validation error: Cannot declare class Response after using setPublic()

Question

我在玩HTTP Cache Validation - Validation with the ETag Header

在我的控制器中我有：

// ... get the $data and $myObject somehow ...

$response = $this->json($data);
$response->setEtag($myObject->getDateModified()->format("Y-m-d H:i:s"));  // getDateModified() returns a DateTime
$response->setPublic();

return $response;

删除缓存后第一次加载页面，控制器是运行，一切正常。但是从第二次开始我只得到：

FatalErrorException in classes.php line 3353: Error: Cannot declare class Symfony\Component\HttpFoundation\Response, because the name is already in use

一用就出现这个问题$response->setPublic();

导致问题的原因是什么？我做错了什么吗？

Answer 1

我找到了这个，也许对你有帮助https://github.com/contao/core-bundle/issues/643

他们建议从 app.php 中删除行 $kernel->loadClassCache();。

It is a speedup attempt which preloads classes which are needed in most requests. This is however obsolete in PHP7.0 and marginal in PHP 5.6 - therefore it is save to remove it.

编辑：我删除了第 $kernel->loadClassCache(); 行，不再有错误，http 缓存工作正常。

此外，这里还有额外信息：https://github.com/symfony/symfony/issues/20668

Symfony Cache Validation error: Cannot declare class Response after using setPublic()

Symfony Cache Validation error: Cannot declare class Response after using setPublic()

php

http-caching

symfony