Symfony 5 Deep Dive! The HttpKernel Request-Response Flow
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Learn how Symfony works under-the-hood with this tutorial. Dive deep into the core of Symfony’s HttpKernel and discover events, controllers, request attributes, and more. By the end, you’ll be able to hook into any part of Symfony.
What you’ll be learning
Want to see how Symfony really works under-the-hood? Let’s do it!
In this tutorial, we’ll dive deep: tracing from the first line of code that’s executed in public/index.php through the core of Symfony’s HttpKernel. It’s a daring adventure that includes events, controller resolvers, request attributes, and giant sea monsters… probably:
Hooking into Symfony with an event subscriber
Finding where the Request is created
The all-powerful HttpKernel::handle() method that’s used in Symfony AND Drupal!
See where the core events like RequestEvent, ControllerEvent and more are dispatched
Controller resolver, argument resolver, argument value resolvers oh my!
Request attributes: the secret carrier of framework info
What is a sub-request?
Manually creating and handling sub-requests
By the end of this tutorial, you’ll understand how the dots connect deep under the surface of Symfony… making you capable of hooking into just about any part of Symfony. Woh.
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