How to add "global" page prefix in wordpress?

Question

htaccess

There is a simple site on woprdpress. It is necessary to add a certain prefix to absolutely all urls at the beginning so that wp itself ignores it, but so that its value can be obtained. Depending on this parameter, different information will be displayed on all pages of the site
Now regular URLs:
Site.ru/category_name/post_name
Site.ru/page_name Required
:
Site.ru/ prefix_name_1 /category_name/post_name -> at this address you need to open the old page Site.ru/category_name/post_name, and the prefix = prefix_name_1
parameter got into some php variable Site.ru/ prefix_name_2/category_name/post_name -> at this address it is necessary that the old page Site.ru/category_name/post_name opens, and the parameter prefix = prefix_name_2 gets into some php variable