My gut reaction is that this should be up to each country to enforce in its borders. If someone in CountryA wants to send a request to my web server in CountryB

My gut reaction is that this should be up to each country to enforce in its borders. If someone in CountryA wants to send a request to my web server in CountryB, in some sense that’s similar to someone buying something in CountryB and bringing it into CountryA. That’s obviously up to CountryA’s customs authority to enforce, not whatever shop in CountryB the item was purchased from. But at the same time I’m very much not into great firewalls.