Redirection of URL

Mostly, this customization can be used in the case, in which user is on any page of site & after login, User need to redirect to that particular page.

Steps for this customization,

Step1 :
Go to the controller of every page.
For core module, app/code/core/Mage/moduleName/controllers/controllerName.php,
i.e. app/code/core/Mage/Catalog/controllers/ProductController.php.
For custom (newly created) module,
i.e. app/code/local/Mage/Contest/controllers/IndexController.php

Step2 :
In controller file every action function , actionNameAction(), i.e. indexAction(), detailAction(), postAction() etc., need to add following line.

Mage::getSingleton('customer/session')->setBeforeAuthUrl($this->getRequest()- >getRequestUri());