When you make changes to important_data.php, you want the new data it sends back to the
browser to be used, but when the browser caches that data you just keep seeing the old data.
To get around that caching, you can change the URL you access slightly by adding a little URL
encoding (which will be ignored by important_data.php).you can change the URL you access slightly by adding a little URLencoding (which will be ignored by important_data.php).
When the browser sees that you’reaccessing a different URL, one that it doesn’t have cached, it will download a fresh copy of thedata from that URL