For now it is impossible to override Request class as it is instantiated in few places.
To permit this override, we need to know on which class to call ::create() method.

This has already been done for sub-request in #7381 and #7390 (the sub requests use the same class as the master request).

This should now be done in following places:

• HttpKernel\Client::filterRequest() method (https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpKernel/Client.php#L109)
• HttpKernel\HttpCache\Esi::handle() method (https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpKernel/HttpCache/Esi.php#L197)
• HttpKernel\HttpCache\Store::purge() method (https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpKernel/HttpCache/Store.php#L315)

What is the best way to let these classes know on which class they should call the ::create() method?