Programmatically 301 Redirect

Question

How can I programmatically perform a 301 redirect in Magento?

Answer 1

In Mage_Core_Controller_Response_Http::setRedirect(), the second option allows you supply the redirect code (defaults to 302), so

Mage::app()->getResponse()
    ->setRedirect($someUrl, 301)
    ->sendResponse();

Answer 2

You can throw an exception in the predispatch event:

// https://github.com/magento-hackathon/HoneySpam/blob/master/app/code/community/Hackathon/HoneySpam/Model/Observer.php
$e = new Mage_Core_Controller_Varien_Exception();
$e->prepareForward('index','error','honeyspam');
throw $e;

Answer 3

If you want to redirect from within a controller, you can use the response object which is on the controller

class Some_Controller extends Mage_Core_Controller_Front_Action
{
    public function exampleAction()
    {
        $this->getResponse()->setRedirect('redirect-url.html', 301);
    }

Answer 4

If you need to redirect all URLs that are redirected by Magento with the default code 302 you can create an Observer in your own module for the dispatched event controller_response_redirect in Mage_Core_Controller_Response_Http::setRedirect():

public function forceDefaultRedirectCode($eventObject)
{
    $urlRedirectionCode = $eventObject->getTransport()->getCode();
    if ($urlRedirectionCode != '302') {
        return;
    }
    $eventObject->getTransport()->setCode(301);
}