system/classes/Route.php
public function run($uri = false, $method = false)
    {
        // Setup and check for route.
        $this->routeProcess($uri, $method);

        // Debug
        $this->debug('Route: ' . $this->pathString);

        // Execute route (will load 404 if not exists)
        $this->routeExec();
    }
public function run($uri = false, $method = false)
    {
        // Setup and check for route.
        $this->routeProcess($uri, $method);

        // Debug
        $this->debug('Route: ' . $this->pathString);

        // Execute route (will load 404 if not exists)
        $this->routeExec();
    }
Processes a route (which in turn sets the PATH, checks custom and default routes),
then executes the route or lack thereof.