What is CI4's approach to API versioning?

API versioning in CodeIgniter 4 is typically handled through route prefixing and namespacing. Define versioned routes: $routes->group("api/v1", ["namespace" => "App\Controllers\Api\V1"], function($routes) { $routes->resource("users"); }) and $routes->group("api/v2", ["namespace" => "App\Controllers\Api\V2"], function($routes) { $routes->resource("users"); }). Create controllers in corresponding namespace directories: app/Controllers/Api/V1/UserController.php. Each version can have its own controller logic, models, and response format. Alternatively, use headers for versioning (Accept: application/vnd.myapi.v2+json) and handle version selection in a filter or base controller. Share common logic through a base API controller that versioned controllers extend. Consider maintaining only the latest two API versions and deprecating older ones with sunset headers.