HTTP Foundation
The HTTP Foundation component contains all logic for request, responses and (in the future) sessions and cookies. HTTP Foundation is fully PSR-7 compliant and therefore easily compatible with third party libraries implementing the same interface.
Request#
The request represents the request made to the application. In a controller this a accessible through $this->getRequest(). If you need to inject the request in a service inject it as Swift\HttpFoundation\RequestInterface $request to avoid a long chain of passing it through from the controller.
Response#
Responses are returned from controller methods and must implement the PSR-7 compliant Swift\HttpFoundation\ResponseInterface. Swift comes out of the box with the following responses:
Swift\HttpFoundation\ResponseSwift\HttpFoundation\JsonResponseSwift\HttpFoundation\RedirectResponseSwift\HttpFoundation\BinaryFileResponse
More on the use of responses and controllers in Routing and Controllers.