For example, if an application is trying to access https://someserver.com/somepage.html?someparameter=123, can I modify it to https://someserver.com/somepage.html?someparameter=123&someadditionalparameter=456 in OpenWrt?
That is, for certain web addresses, I would like to add some GET parameters. If you want to know why, I would like to change the country for Google search/suggestions and other Google services.
I already wrote and am using a Chrome extension for that, but mobile Chrome or the Google app do not support such method, so I wondered if I could do it at the router-level.
If it is very difficult or problematic, I will give up. Thank you for the advice.