* Indexing these items as `onBeginRequest` and `onEndRequest` will trigger attaching callbacks to application events.
* Event handlers are even acceptable since they'll take the event object as first argument.
* Please visit official PHP site for more information regarding [ob_start](http://php.net/ob_start) and [ob_gzhandler](http://php.net/ob_gzhandler). In summary, the latter will check whether the client is compatible with gzipped content, set the Content-Encoding header and compress all the content generated during processRequest accordingly.
* If the current browser is not capable of uncompressing gzip, gzhandler will leave the output untouched.
(If you need additional functionality, you may want to create a separate file for these functions.)