I just upgraded from Rails 5 to 6. When sending some file to download to the client, I now have a different Content-Disposition:
Before:
attachment; filename="Report_test_name Product_test_name A4A WCAG20 Project_test_name Project_test_customer 15-2015 v0.5.md"
Now:
attachment; filename="Report_test_name Product_test_name A4A WCAG20 Project_test_name Project_test_customer 15-2015 v0.5.md"; filename*=UTF-8''Report_test_name%20Product_test_name%20A4A%20WCAG20%20Project_test_name%20Project_test_customer%2015-2015%20v0.5.md
So it adds this funny filename*=UTF-8''Report_test_name... thing to the string.
I think that's just a new feature that I didn't know of. But what exactly does it? And why?