Application::initializeContext

protected function initializeContext(array $params);

/**
 * Starts request execution. Should be called after initialize.
 * Should be implemented in subclass.
 */
abstract public function start();

/**
 * Runs controller and its action and sends response to the output.
 *
 * It's a stub method, and we can't mark it as abstract because there is compatibility.
 * @return void
 */
public function run()
{
}