What is the Request object in CodeIgniter 4?

The Request object provides access to all incoming HTTP request data. Access in controllers via $this->request. GET parameters: $this->request->getGet("name"). POST parameters: $this->request->getPost("name"). Either (GET or POST): $this->request->getVar("name"). All POST data: $this->request->getPost(). JSON body: $this->request->getJSON() (for API endpoints receiving JSON). Request method: $this->request->getMethod(). Check method: $this->request->is("post"). IP address: $this->request->getIPAddress(). User agent: $this->request->getUserAgent(). Headers: $this->request->getHeader("Accept"). Files: $this->request->getFile("avatar"). Server data: $this->request->getServer("SERVER_NAME"). Apply filters to input: $this->request->getPost("name", FILTER_SANITIZE_STRING).