Universal Auto Action to store user location

I want to create an auto action that saves the uri that the user is on, on every page for all registered users. I have tried various combinations and I can't get it to work.

I have created a code auto action triggered by the joomla_onContentPrepare action that keeps the required code and places it in a variable cb_sitelocation as follows:

$user->set( 'cb_sitelocation', "" );

$pageURL = (isset( $_SERVER ) && $_SERVER == 'on') ? "https://" : "http://";
$pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
$trim_query_string = false;
if( ! $trim_query_string ) {
$user->set( 'cb_sitelocation', "$pageURL" );

} else {
$url = explode( '?', $pageURL );
$user->set( 'cb_sitelocation', "$url[0]" );

}

I have a CB content module that displays the username on every page to initialize CB and I can see the action executes but the data is either never stored or my data is stored not the users.

CB Auto Actions can't act on Joomla events unless you've CB Auto Actions Bot installed and published. With that said content prepare could easily fire 20+ times on a single page and do not recommend using that event. Additionally you are never calling a ->store in your code so it's not going to save anything to begin with. You may also need to set User to Self since that event doesn't have a user object. As for what Joomla event to use you'll probably need to use something early in the rendering process like joomla_onAfterRespond as that fires after the renderer and router and should only do so once.