Sometimes you will need to create a validation once you are entering through an url, and then redirect the user to another site/section.

In this case, we want to get those uppercase non existing urls, and redirect the user to the corresponding existing lowercase url (Case insensitive).

To do so, i created the following local extension, catching the controller_action_predispatch event.

• app/etc/modules/Offset101_UrlCustomization.xml
  
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  <?xml version="1.0"?> <config>     <modules>         <Offset101_UrlCustomization>             <active>true</active>             <codePool>local</codePool>         </Offset101_UrlCustomization>     </modules> </config>

• app/code/local/Offset101/UrlCustomization/etc/config.xml
  
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  <?xml version="1.0"?> <config>     <modules>         <Offset101_UrlCustomization>             <version>0.0.1</version>         </Offset101_UrlCustomization>     </modules>     <global>         <models>             <offset101urlcustomization>                 <class>Offset101_UrlCustomization_Model</class>             </offset101urlcustomization>         </models>     </global>     <frontend> <!-- You can change it to adminhtml in case you want those backend urls -->         <events>             <!-- observe the event -->             <controller_action_predispatch>                 <observers>                     <offset101urlcustomization>                         <class>offset101urlcustomization/observer</class>                         <method>changeToLowercaseURL</method>                     </offset101urlcustomization>                 </observers>             </controller_action_predispatch>         </events>     </frontend> </config>

• app/code/local/Offset101/UrlCustomization/Model/Observer.php
  
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  <?php class Offset101_UrlCustomization_Model_Observer {     public function changeToLowercaseURL($observer) {         // If the url do not exists         if ($observer->getEvent()->getControllerAction()->getFullActionName() == 'cms_index_noRoute') {             // Validate if i make a redirection before, to avoid infinit loops in non existing lower case urls             if($_SESSION["countredirects"]){                 session_unset($_SESSION["countredirects"]);                return;             }             // Create a variable to validate further infinit loops             $_SESSION["countredirects"] = true;             $requestedString = $observer->getEvent()->getControllerAction()->getRequest()->getRequestString();             $newURL = rtrim(Mage::getBaseUrl(), '/') . strtolower($requestedString);             Mage::app()->getFrontController()->getResponse()->setRedirect($newURL);             Mage::app()->getResponse()->sendResponse();             exit;         }     } } ?>