Comment by LinAGKar

Is there anything in those EU directives that requires browsers to let webpages connect to localhost? Because that's the main issue here. And also maybe apps should need permission to listen on ports or connect to localhost, but I doubt the regulation prevents that either.

On https://localmess.github.io/, they think that this is technically possible on iOS too, and the main reason it wasn't done there is due to restrictions on apps running in the background.

This is nothing new that has been opened up because of those regulations.