Firefox, Safari, and Chrome/Edge on my machine all have built-in validation for <input type="url"> that requires a scheme before allowing users to submit a form.
Why is Django assuming a scheme at all vs doing validation similar to browsers (“Please enter a URL”) to catch incoming data from non-browser sources? When I first saw mention of this change in the release notes, I didn’t realize Django had been assuming “http://” and at first thought all of our forms with URL fields might have been accepting scheme-less URLs this entire time until I actually tested one such form. There isn’t a straightforward way I’m aware of to test assume_scheme and the transitional setting in a browser.