Thank you so much! My application is working again on the old version. I cannot work out where the problem is, and the changelog says any changes to 2.0.0 would be backwards compatible.
This is the URL I am using, which works in 1.4.4, but not in 2.0.1. Does anybody have any ideas?
Version 2.0.2 was released just after posting this which has fixed the backward compatible issue. Thanks for the help!