subdomain bootstrap

/**
 * Set the routes. Each route must have a minimum of a name, a URI and a set of
 * defaults for the URI.
 */
Route::set('api', '(<action>(/<id>))')
	->defaults(array(
		'subdomain'  => 'api',
		'controller' => 'api',
		'action'     => 'subdomain',
	));
Route::set('default', '(<controller>(/<action>(/<id>)))')
	->defaults(array(
		'controller' => 'welcome',
		'action'     => 'index',
	));

/**
 * Execute the main request. A source of the URI can be passed, eg: $_SERVER['PATH_INFO'].
 * If no source is specified, the URI will be automatically detected.
 */

try
{
	$request  = Request::instance();
	// execute (returns response) & send headers
	$response = $request->execute();
	// echo content
	echo $response->send_headers()->body();
}
catch( exception $e )
{
	if(Kohana::$environment === Kohana::DEVELOPMENT)
	{
		// re-throw error
		throw($e);
	}
	else
	{
		// log it
		Kohana::$log->add(Kohana::ERROR, Kohana::exception_text($e)); 
		
		// get type of error
		switch(get_class($e))
		{
			// no controller/action for this uri
			case 'ReflectionException':
			// no route for the uri
			case 'Kohana_Request_Exception':
			
				// throw a 404
				$response = new Response();
				$response->status = 404;
				$response->body = /* View::factory('errors/404')->render(); */ '404';
				echo $response->send_headers()->body();
				
				break;
		}
	}
}

subdomain controller

<?php defined("SYSPATH") or die();

class controller_api extends controller {
	
	public function before()
	{
		if($this->request->subdomain != 'api')
			throw new Kohana_Request_Exception('404 Not Found', null, 404);
	}
	
	public function action_subdir()
	{	
		$this->response->body = "This is a <strong>subdirectory</strong> API call";
	}
	
	public function action_subdomain()
	{	
		$this->response->body = "This is a <strong>subdomain</strong> API call";
	}
	
	public function action_hmvc()
	{
		// Create a new HMVC request. Set the subdomain to false to access default route.
		$this->response->body = Request::factory('/welcome/index', array('subdomain' => false))->execute();
	}

	public function after()
	{	
		$this->response->body .= '<h6>Request: </h6>';
		$this->response->body .= Kohana::debug($this->request);
	}
}