clear cache - page form reload

Clear cached URL parameters in Joomla.

Overview

The issue is caused by Joomla's page cache retaining old URL parameters.
Enable the page cache plugin and configure it to exclude the specific URLs or menu items where dynamic parameters are used.

ad adam M 03 Mar, 2021
I use some data from page url = when the page is loaded with some parameter ( for example http://xxx.xxx.xxx/index.php?param1=111&param2=222 ) I can use this data in my form🙂
Thats ok
But when I later load the same page without second parameter ( for example )http://xxx.xxx.xxx/index.php?param1=111 ) the data array of this page still holds the param2 value. So if I check the value on that page ( if param2=222 ) I still get true even if this parameter is not present in the url. It is still in a cache.

Where is the problem ? How can I clear a cache that holds the param2 ?
ad adam M 04 Mar, 2021
Answer
I found the solution.
The problem is joomla cache.
All explained here : https://docs.joomla.org/Cache

First I turned on plugin : page cache
then excluded some url and menu items

it is working🙂
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