Quick idea: you *can* use the Referrer header to disambiguate reliably. Every time you render a <form> include a "?nonce=XXX" in the form action. When the POST action generates a notification tie it to that nonce, and then the resulting GET can find the right notification to display.
Quick idea: you *can* use the Referrer header to disambiguate reliably. Every time you render a <form> include a "?nonce=XXX" in the form action. When the POST action generates a notification tie it to that nonce, and then the resulting GET can find the right notification to display.