Embed them in query parameters. EDIT: What I originally wrote is somewhat off. It was directly in PHP: https://www.php.net/manual/en/session.idpassing.php ht

Embed them in query parameters. EDIT: What I originally wrote is somewhat off. It was directly in PHP: https://www.php.net/manual/en/session.idpassing.php https://www.php.net/manual/en/session.idpassing.php I don't know if I'm remembering right, but I seem to remember some early PHP framework or templating system, $_SESSION variables could be configured to use query parameters instead of cookies. So every link generated by the framework automatically inserted a "?SESSIONID=12345" at the end of the link. The backend translated this into the PHP $_SESSION object.