在EventSubscriber Symfony 3.4上发送响应

// src/EventSubscriber/MyEventSubscriber.php

namespace App\EventSubscriber;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

class MyEventSubscriber implements EventSubscriberInterface
{
    public function onKernelResponse(ResponseEvent $event)
    {
        // 在这里添加自定义逻辑，例如修改响应内容或设置响应头部信息
        $response = $event->getResponse();
        $response->setContent('Hello, World!');
    }

    public static function getSubscribedEvents()
    {
        // 指定要监听的事件和对应的回调方法
        return [
            KernelEvents::RESPONSE => 'onKernelResponse',
        ];
    }
}

# config/services.yaml

services:
    App\EventSubscriber\MyEventSubscriber:
        tags:
            - { name: kernel.event_subscriber }