I would like to offer an ical or webcal request on one of my pages. Which hock would be best to intercept the request that comes via URL?

At the moment I use the following hook for this:

add_action ( 'init', 'webcal_events');
function webcal_events ()
{
    
    if ($_SERVER['SCRIPT_URL'] == '/events/webcal')
    {
    header('Content-type: text/calendar; charset=utf-8');
    header('Content-Disposition: inline; filename="events.ics"');
      ... do ICS stuff
    exit(); 

    }
}