What's the last event dispatched before content is sent to the browser?

Question

I need to set or update a cookie, but I want to ensure that all (or as much as possible) of the request processing occurs before my cookie generation code runs. i.e. if the user logs in, I want to ensure that the login processing has occurred before my code runs, or if the user adds something to their cart I want to know that all cart processing is done first.

Are there any events that are dispatched immediately before a response is sent to the browser?

Answer 1

The last event dispatched in Magento 1.x before content is rendered is

controller_front_send_response_after

If there are no extra requirements in observer data that you would need, this one should be perfect for you.

Answer 2

A handy trick, to find events fired during a page request / action, is to temporarily edit app/Mage.php and write out the events fired to var/log/system.log

 public static function dispatchEvent($name, array $data = array())
    {
        Varien_Profiler::start('DISPATCH EVENT:'.$name);
        $result = self::app()->dispatchEvent($name, $data);
        Varien_Profiler::stop('DISPATCH EVENT:'.$name);
        return $result;
    }

to

public static function dispatchEvent($name, array $data = array())
    {
        if(mage::getIsDeveloperMode()) {
           mage::log($name);
        }
        Varien_Profiler::start('DISPATCH EVENT:'.$name);
        $result = self::app()->dispatchEvent($name, $data);
        Varien_Profiler::stop('DISPATCH EVENT:'.$name);
        return $result;
    }

and then tail the log file. I have found this method extremely useful, and saved a lot of time hunting for that elusive event to use.

Naturally you should remove it immediately, as you do not want to commit changed core files. I wrap it into the developer check, just in case.